Narrow Results by:

Subject Specific Filters:

  1. Category:             (show all)

    Foliage Diseases (28)
    Root Rot (14)
    Root and Butt / Root and Stem Diseases (8)
    Stem and Leaf Rusts (6)
    Stem Decays and Cankers (4)

  1. Order:                   

    Peronosporales (54)
    Albuginales (6)
    Saprolegniales (2)
    Sclerosporales (1)

Image Specific Filters:

  1. Descriptor:           (show all)

    Symptoms (1215)
    Sign (210)
    Asexual Spore (96)
    Feature(s) (43)
    Foliage (39)

  1. Commodity:         (show all)

    Hardwood (272)
    Herbaceous (250)
    Trees (156)
    Tobacco (140)
    Squash, Pumpkins and Gourds (101)

Image Setting:

Field (944)
Laboratory (730)
Museum (25)

  1. View:                     

    Close-up (14)
    Identifying Feature (11)
    Ventral / Adaxial / Front (9)
    Aerial (3)
    Dorsal / Abaxial / Back (2)

Person in Image:

Yes (3)

  1. Country:                (show all)

    United States (1663)
    Taiwan (24)
    Germany (23)
    United Kingdom (21)
    Slovakia (8)

  1. Author:                  (show all)

    Florida Division of Plant Industry Archive (233)
    Gerald Holmes (175)
    Joseph O'Brien (160)
    Paul Bachi (131)
    Jason Brock (106)

Sizes Available:

5 sizes(1052)
4 sizes(455)
3 sizes(268)

Orientation:

Landscape (1500)
Portrait (245)

Oomycetes

Kingdom: Chromista
Phylum: Oomycota
Class: Oomycetes
1,775 Images of 63 Subjects View Subject List View Image Details View Thumbnails

first prev Page: next last Display:

Image Subject Name Scientific Name Description
5492327 Phytophthora blight Phytophthora capsici Phytophthora capsici infection of ripe zucchini fruit
5484090 late blight Phytophthora infestans Late blight symptom, leaf spot, view of upper and lower leaf surfaces.
5484091 late blight Phytophthora infestans late blight symptom on green fruit surface
5484092 late blight Phytophthora infestans Late blight internal symptom in green fruit
5490505 downy mildew Plasmopara halstedii Sporangia on sporangiophores
5492321 late blight Phytophthora infestans Cut surface exposing internal symptoms of tuber infected with Phytophthora infestans
1574141 Pythium diseases Pythium spp. Fruit rot caused by Pythium sp.  
1574101 downy mildew Pseudoperonospora cubensis Early downy mildew lesions are easily detected by holding up to the sun for reverse lighting. October 1997   
1574099 downy mildew Pseudoperonospora cubensis Micrograph taken using a dissecting microscope showing sporulation of P. cubensis on the underside of a squash leaf. Sporulation occurs most readily in small protected areas, such as next to leaf veins. October 1997
1574100 downy mildew Pseudoperonospora cubensis Micrograph taken using a dissecting microscope showing sporulation of P. cubensis on the underside of a squash leaf. Sporulation occurs most readily in small protected areas, such as next to leaf veins. October 1997
1574057 downy mildew Pseudoperonospora cubensis Underside of leaf; top is downy mildew, bottom is powdery mildew. September 1997
1574031 downy mildew Pseudoperonospora cubensis Close-up of lesions on pumpkin leaf. Chlorotic spots will eventually become necrotic. September 1997
1574030 downy mildew Pseudoperonospora cubensis Close up of downy mildew lesions on pumpkin. September 1997
5495342 Pythium diseases Pythium spp. Rubus strigosus plants and canes affected by Pythium species
1573929 downy mildew Pseudoperonospora cubensis Close up of diseased leaf showing hundreds of pinpoint lesions. September 1997
1573928 downy mildew Pseudoperonospora cubensis Close up of diseased leaves showing thousands of pinpoint lesions. September 1997
1573926 downy mildew Pseudoperonospora cubensis Very early symptoms on leaf. September 1997
1573927 downy mildew Pseudoperonospora cubensis Slose up of diseased leaf, showing pin-point lesions. September 1997
1573896 Phytophthora blight Phytophthora capsici Cross section of lower stem and roots of diseased plant. September 1997
1573897 Phytophthora blight Phytophthora capsici Cross section of lower stem and roots of diseased plant. September 1997
1573895 Phytophthora blight Phytophthora capsici Bell pepper fruit completely rotted by Phythophthora capsici. September 1997
1573890 Phytophthora blight Phytophthora capsici Diseased fruit with sporulating Phytophthora capsici. Note that infection began at the point of contact of fruit with soil. September 1997
1573894 Phytophthora blight Phytophthora capsici Diseased fruit with sporulating Phytophthora capsici. Note the margin between sound and rotted fruit tissue in advance of sporulation. September 1997
1573893 Phytophthora blight Phytophthora capsici Diseased fruit with sporulating Phytophthora capsici. Note the margin between sound and rotted fruit tissue in advance of sporulation. September 1997
1573891 Phytophthora blight Phytophthora capsici Diseased fruit with sporulating Phytophthora capsici. September 1997
1573845 late blight Phytophthora infestans close up of diseased leaves. September 1997
1573837 white rust Albugo candida Severely diseased leaves of morning glory.  The same disease occurs on sweetpotato, a close relative of morning glory. August 1997
1573831 downy mildew Pseudoperonospora cubensis Early symptoms of downy mildew on leaves. August 1997
1573832 downy mildew Pseudoperonospora cubensis Early symptoms of downy mildew on leaves. August 1997
1573810 downy mildew Pseudoperonospora cubensis Early symptoms of downy mildew on underside of squash leaf. August 1997
1573809 downy mildew Pseudoperonospora cubensis Early symptoms of downy mildew on underside of squash leaf. August 1997
1573743 downy mildew Pseudoperonospora cubensis Heavily diseased leaves of a susceptible cultivar. August 1997
1573744 downy mildew Pseudoperonospora cubensis Heavily diseased leaves of a susceptible cultivar. August 1997
1573741 downy mildew Pseudoperonospora cubensis Heavily diseased plants of a susceptible cultivar. All the yellowing is caused by downy mildew. August 1997
1573742 downy mildew Pseudoperonospora cubensis Close-up of heavily diseased plants of a susceptible cultivar. August 1997
1573740 downy mildew Pseudoperonospora cubensis Heavily diseased plants of a susceptible cultivar. August 1997
5494852 downy mildew Peronospora lamii Peronospora lamii sporangium from coleus
5494853 downy mildew Peronospora lamii Peronospora lamii sporangium from coleus
5494854 downy mildew Peronospora lamii Peronospora lamii sporangium from coleus
5494855 downy mildew Peronospora lamii Peronospora lamii sporangium from coleus
5494856 downy mildew Peronospora lamii Peronospora lamii sporangium from coleus
5494857 downy mildew Peronospora lamii Peronospora lamii spores from coleus
5494888 downy mildew Plasmopara obducens Plasmopara obduscens sporangia
5494889 downy mildew Plasmopara obducens Plasmopara obduscens sporangia
5494890 downy mildew Plasmopara obducens Plasmopara obduscens sporangia
5494891 downy mildew Plasmopara obducens Plasmopara obduscens sporangia
1573739 downy mildew Pseudoperonospora cubensis Research Technician Wayne Pollard (NCSU) applies fungicide to a small plot in a pumpkin powdery mildew fungicide performance trial. August 1997
1573708 downy mildew Pseudoperonospora cubensis Downy mildew on squash and pumpkin often causes small yellow spots. August 1997
1573706 downy mildew Pseudoperonospora cubensis Downy mildew on squash and pumpkin often causes small yellow spots. August 1997
1573707 downy mildew Pseudoperonospora cubensis Downy mildew on squash and pumpkin often causes small yellow spots. August 1997
1573705 downy mildew Pseudoperonospora cubensis Downy mildew on squash and pumpkin often causes small yellow spots. August 1997
1573699 downy mildew Pseudoperonospora cubensis Affected squash field. August 1997
1573690 downy mildew Pseudoperonospora cubensis Underside of cantaloupe leaf where the pathogen sporulates. August 1997
1573689 downy mildew Pseudoperonospora cubensis Close up of diseased leaf.  Note the bright yellow halo around each lesion typical of downy mildew symptoms on cantaloupe (cv. Athena). August 1997
1573688 downy mildew Pseudoperonospora cubensis Cultivar = Athena. August 1997
1573687 downy mildew Pseudoperonospora cubensis Close up of diseased leaf edge. Cultivar = Athena. August 1997
1573686 downy mildew Pseudoperonospora cubensis Close up of diseased leaf on black background. Cultivar = Athena. August 1997
5495160 Pythium diseases Pythium spp. Calla lily plants for tuber production, Zantedeschia aethiopica; plant yellowing due to infection by Pythium species
5495161 Pythium diseases Pythium spp. Calla lily plants for tuber production, Zantedeschia aethiopica; plant yellowing and death due to infection by Pythium species
5495162 Pythium diseases Pythium spp. Calla lily plants for tuber production, Zantedeschia aethiopica; plant yellowing and death due to infection by Pythium species
5495165 Pythium diseases Pythium spp. Calla lily plants for tuber production, Zantedeschia aethiopica; plant yellowing due to infection by Pythium species
5495167 Pythium diseases Pythium spp. Calla lily plant, Zantedeschia aethiopica; plant yellowing due to infection by Pythium species
1573367 Phytophthora blight Phytophthora capsici Fungicide performance evaluation against Phytophthora blight.  The staked row with healthy plants was treated with Acrobat (a.i. = dimethomorph). The row of dead plants to the right was not treated. July 1997
1573366 Phytophthora blight Phytophthora capsici Fungicide performance evaluation against Phytophthora blight.  The staked row with healthy plants was treated with Acrobat (a.i. = dimethomorph). The row of dead plants to the right was not treated. July 1997
1573365 Phytophthora blight Phytophthora capsici Areas of the bed where plants are missing are low spots where water puddled and plants succumbed to Phytophthora blight.  Phytophthora thrives in water-saturated environments. July 1997
1573363 Phytophthora blight Phytophthora capsici Dead summer squash plant caused by Phytophthora blight attacking the crown. July 1997
1573364 Phytophthora blight Phytophthora capsici One of the first symtpoms of Phytophthora blight is wilting caused by a girdling of the vascular tissue at the base of the plant. July 1997
1573362 Phytophthora blight Phytophthora capsici One of the first symtpoms of Phytophthora blight is wilting caused by a girdling of the vascular tissue at the base of the plant. July 1997
1573361 Phytophthora blight Phytophthora capsici Dead summer squash plant after rotting at the crown and root by Phytophthora capsici. July 1997
1573360 Phytophthora blight Phytophthora capsici Close-up of crown of summer squash rotted by Phytophthora capsici. July 1997  
1573359 Phytophthora blight Phytophthora capsici Close-up of crown of summer squash rotted by Phytophthora capsici. July 1997
1573357 Phytophthora blight Phytophthora capsici Close-up of crown of summer squash rotted by Phytophthora capsici. July 1997
1573356 Phytophthora blight Phytophthora capsici Root and crown of summer squash rotted by Phytophthora capsici. July 1997
1573300 Pythium diseases Pythium spp. Cottony leak of cucumber. June 1997
5494883 downy mildew Plasmopara obducens Sporulation of Plasmopara obduscens on Impatiens walleriana
1573635 white rust Albugo ipomoeae-panduratae ????????Morning glory leaf (lower surface facing upward) with heavy sporulation of white rust, on top of a sweetpotato leaf from the same area that is not affected.  This shows the degree of susceptibility between the two species of Ipomoeae. July 1997
1573632 white rust Albugo ipomoeae-panduratae Top and underside of leaves infected with white rust.  Lower leaf surface shows abundant sporulation. July 1997
5494884 downy mildew Plasmopara obducens Sporulation of Plasmopara obduscens on Impatiens walleriana
5494885 downy mildew Plasmopara obducens Sporulation of Plasmopara obduscens on Impatiens walleriana
5494886 downy mildew Plasmopara obducens Sporulation of Plasmopara obduscens on Impatiens walleriana
5494887 downy mildew Plasmopara obducens Sporulation of Plasmopara obduscens on Impatiens walleriana
5494881 downy mildew Plasmopara obducens Sporulation of Plasmopara obduscens on Impatiens walleriana
5494882 downy mildew Plasmopara obducens Sporulation of Plasmopara obduscens on Impatiens walleriana
5494844 downy mildew Peronospora lamii Peronospora lamii sporangia on coleus leaf
5494845 downy mildew Peronospora lamii Peronospora lamii sporangia on coleus leaf
5494846 downy mildew Peronospora lamii Peronospora lamii sporangia on coleus leaf
5494847 downy mildew Peronospora lamii Peronospora lamii sporangia on coleus leaf
5494848 downy mildew Peronospora lamii Peronospora lamii sporangia on coleus leaf
5494880 downy mildew Plasmopara obducens Upper surface of impatiens leaf infected with Plasmopara obduscens, the cause of downy mildew
5494869 downy mildew Plasmopara obducens Early symptoms of downy mildew on Impatiens walleriana
5494870 downy mildew Plasmopara obducens Early symptoms of downy mildew on Impatiens walleriana
5494871 downy mildew Plasmopara obducens Lower leaf surfaces of impatiens showing a layer of spores of Plasmopara obduscens, the cause of downy mildew
5494872 downy mildew Plasmopara obducens Lower leaf surfaces of impatiens showing a layer of spores of Plasmopara obduscens, the cause of downy mildew
5494873 downy mildew Plasmopara obducens Lower leaf surfaces of impatiens showing a layer of spores of Plasmopara obduscens, the cause of downy mildew
5494874 downy mildew Plasmopara obducens Lower leaf surfaces of impatiens showing a layer of spores of Plasmopara obduscens, the cause of downy mildew
5494875 downy mildew Plasmopara obducens Lower leaf surfaces of impatiens showing a layer of spores of Plasmopara obduscens, the cause of downy mildew
5494877 downy mildew Plasmopara obducens Lower leaf surfaces of impatiens showing a layer of spores of Plasmopara obduscens, the cause of downy mildew
5494878 downy mildew Plasmopara obducens Lower leaf surfaces of impatiens showing a layer of spores of Plasmopara obduscens, the cause of downy mildew
5494879 downy mildew Plasmopara obducens Lower surface of impatiens leaf showing a layer of spores of Plasmopara obduscens, the cause of downy mildew
5494864 downy mildew Peronospora lamii Peronospora lamii sporangia on coleus leaf
5494865 downy mildew Peronospora lamii Peronospora lamii sporangia on coleus leaf
5494866 downy mildew Peronospora lamii Peronospora lamii sporangia on coleus leaf
5494867 downy mildew Peronospora lamii Peronospora lamii sporangia on coleus leaf
5494868 downy mildew Peronospora lamii Peronospora lamii sporangia on coleus leaf
5494858 downy mildew Peronospora lamii Downy mildew symptoms on coleus
5494859 downy mildew Peronospora lamii Downy mildew symptoms on coleus
5494860 downy mildew Peronospora lamii Downy mildew symptoms on coleus
5494861 downy mildew Peronospora lamii Downy mildew symptoms on coleus
5494862 downy mildew Peronospora lamii Peronospora lamii sporangia on coleus leaf
5494876 downy mildew Plasmopara obducens Lower leaf surfaces of impatiens showing a layer of spores of Plasmopara obduscens, the cause of downy mildew
5494863 downy mildew Peronospora lamii Peronospora lamii sporangia on coleus leaf
5494837 downy mildew Peronospora lamii Downy mildew symptoms on coleus
5494838 downy mildew Peronospora lamii Downy mildew symptoms on coleus
5494839 downy mildew Peronospora lamii Downy mildew symptoms on coleus
5494840 downy mildew Peronospora lamii Downy mildew symptoms on coleus
5494841 downy mildew Peronospora lamii Downy mildew symptoms on coleus
5494842 downy mildew Peronospora lamii Downy mildew symptoms on coleus
5494843 downy mildew Peronospora lamii Downy mildew symptoms on coleus
5494836 basil downy mildew Peronospora belbahrii A diseased potted plant
5492227 Phytophthora root and stem rot Phytophthora drechsleri Stem and foliar blight symptoms
5492255 Pythium root and stem rot Pythium aphanidermatum Pythium root rot
5492836 Phytophthora root and stem rot Phytophthora cryptogea Sporangia production induced from infected tissue by floating in 1% non-sterile solution of soil in deionized water. Host: Osteospermum spp.
5492839 Phytophthora root and stem rot Phytophthora cryptogea Sporangia production induced from infected tissue by floating in 1% non-sterile solution of soil in deionized water.Host: Osteospermum spp.
5492840 Phytophthora root and stem rot Phytophthora cryptogea Sporangia production induced from infected tissue by floating in 1% non-sterile solution of soil in deionized water.Host: Osteospermum spp.
5492832 Phytophthora root and stem rot Phytophthora cryptogea Sporangia in liquid culture. Size ranges vary with isolate but are most commonly about 40 x 28 um.Host: Osteospermum spp
5492833 Phytophthora root and stem rot Phytophthora cryptogea Sporangia in liquid culture. Size ranges vary with isolate but are most commonly about 40 x 28 um.Host: Osteospermum spp.
5492834 Phytophthora root and stem rot Phytophthora cryptogea Sporangia in liquid culture. Size ranges vary with isolate but are most commonly about 40 x 28 um. Host: osteospermum spp
5492835 Phytophthora root and stem rot Phytophthora cryptogea Sporangia in liquid culture showing internal proliferation. Size ranges vary with isolate but are most commonly about 40 x 28 um.Host: Osteospermum spp
5492830 Phytophthora root and stem rot Phytophthora cryptogea Sporangia showing internal proliferation. Size ranges vary with isolate but are most commonly about 40 x 28 um. Host: Osteospermum spp.
5492831 Phytophthora root and stem rot Phytophthora cryptogea Sporangia in liquid culture. Size ranges vary with isolate but are most commonly about 40 x 28 um. Host: Osteospermum spp
5492857 Phytophthora root rot Phytophthora cinnamomi Tree with moderate symptoms; it will probably die within four years.
5492852 Phytophthora root rot Phytophthora cinnamomi Tree with severe symptoms; it will probably die within one year.
5492856 Phytophthora root rot Phytophthora cinnamomi Tree with moderate symptoms; it will probably die within four years.
5492854 Phytophthora root rot Phytophthora cinnamomi Tree with severe symptoms; it will probably die within one year.
5492855 Phytophthora root rot Phytophthora cinnamomi Tree with moderate symptoms; it will probably die within four years.
5492853 Phytophthora root rot Phytophthora cinnamomi Tree with severe symptoms; it will probably die within one year.
5485260 downy mildew Bremia lactucae infected leaf
5485259 downy mildew Bremia lactucae Infected leaf
5485257 downy mildew Bremia lactucae Sporangia
5485258 downy mildew Bremia lactucae Sporangia
5485256 downy mildew Bremia lactucae Sporangia surface view
5485255 downy mildew Bremia lactucae Sporangiophores and sporangia
5485254 downy mildew Bremia lactucae Sporangiophore and sporangia
5485253 downy mildew Bremia lactucae Sporangiophores and sporangia
5485252 downy mildew Bremia lactucae Sporangiophores
5485251 downy mildew Bremia lactucae Sporangiophore
5485250 downy mildew Bremia lactucae Sporangiophores emerging from leaf tissue
5490510 downy mildew Plasmopara halstedii Symptomatic infected leaf
5490509 downy mildew Plasmopara halstedii Sporangia
5490508 downy mildew Plasmopara halstedii Sporangia
5490507 downy mildew Plasmopara halstedii Sporangiophore tips
5490506 downy mildew Plasmopara halstedii Sporangiophore
5490504 downy mildew Plasmopara halstedii Sporangia
5490503 downy mildew Plasmopara halstedii Sporangia
5490502 downy mildew Plasmopara halstedii Sporangiophores
5490501 downy mildew Plasmopara halstedii Sporangiophores
5490500 downy mildew Plasmopara halstedii Sporangiophores growing from leaf
5490499 downy mildew Plasmopara halstedii Sporulation on leaf surface
5490498 downy mildew Plasmopara halstedii Sporulation on leaf surface
1573322 Pythium diseases Pythium spp. Cross section of cucumber fruit infected with Pythium cottony leak. June 1997 
5492229 basil downy mildew Peronospora belbahrii chlorosis on leaves
5492257 late blight Phytophthora infestans diseased leaf
5492258 late blight Phytophthora infestans diseased leaf
5492256 Pythium diseases Pythium spp. Phytium root rot
1573299 Pythium diseases Pythium spp. Pythium cottony leak of cucumber. June 1997
1573297 Pythium diseases Pythium spp. Pythium cottony leak of cucumber. June 1997
1573193 white rust Albugo candida White rust pustules on the leaf underside. June 1997
1573194 white rust Albugo candida White rust pustules on the leaf underside. June 1997
1573192 white rust Albugo candida White rust sporulates on the leaf underside, but causes yellow spotting on the top of the leaf. June 1997
1573191 white rust Albugo candida White rust pustules on the leaf underside. June 1997
1568026 late blight Phytophthora infestans stem lesions
1573036 late blight Phytophthora infestans Late blight affected areas of a potato field after treatment with herbicide to stop the spread of the disease. May 1997
1572972 Pythium diseases Pythium spp. Micrograph of watermelon root tissue with Pythium oospores embedded. May 1997
1572970 Pythium diseases Pythium spp. Micrograph (phase contrast) of watermelon root tissue with Pythium oospore embedded. May 1997
1572969 Pythium diseases Pythium spp. Micrograph of watermelon root tissue with Pythium oospores embedded. May 1997
1572968 Pythium diseases Pythium spp. Micrograph of watermelon root tissue with Pythium oospores embedded. May 1997
1572967 Pythium diseases Pythium spp. Micrograph of watermelon root tissue with Pythium oospore embedded. May 1997
1572966 Pythium diseases Pythium spp. Micrograph of watermelon root tissue showing Pythium oospores throughout. May 1997
1572965 Pythium diseases Pythium spp. Potted watermelon seedling with a Pythium damping-off lesion at the soil line. May 1997
1572964 Pythium diseases Pythium spp. Watermelon seedling showing symptoms of Pythium damping-off. May 1997
1572963 Pythium diseases Pythium spp. Watermelon transplant suffering from damping-off caused by Pythium spp. May 1997
1572962 Pythium diseases Pythium spp. Watermelon transplant suffering from damping-off caused by Pythium spp. May 1997
1572960 Pythium diseases Pythium spp. Pythium root rot (left) and healthy (right) watermelon transplant roots. May 1997
1572958 Pythium diseases Pythium spp. Pythium root rot on watermelon seedling.  Roots should be white (see 1572959 and 1572960). May 1997
5488694 Phytophthora root and crown rot Phytophthora cambivora symptomps of Phytophthora cambivora infection on European chestnut
5488709 Phytophthora root and crown rot Phytophthora cambivora tree mortality caused by Phytophthora cambivora on European chestnut stand
5485732 downy mildew Plasmopara obducens
5485733 downy mildew Plasmopara obducens
5485734 downy mildew Plasmopara obducens
5485735 downy mildew Plasmopara obducens
5485736 downy mildew Plasmopara obducens
5411395 Phytophthora blight Phytophthora capsici wilted plant and blighted fruit on squash
5411396 Phytophthora blight Phytophthora capsici rotting stalk of squash
5411397 Phytophthora blight Phytophthora capsici blighted fruit with signs of Phytophthora on squash
5487855 downy mildew Peronospora sparsa Rubus argutus 'Black Satin' Sporangia and sporangiophores on host tissue
5487856 downy mildew Peronospora sparsa Rubus argutus 'Black Satin' Sporangiophore and sporangia
5487854 downy mildew Peronospora sparsa Rubus argutus 'Black Satin' sporangia and sporangiophores
5487939 downy mildew Peronospora sparsa Rubus argutus 'Black Satin' Leaf lesions
5487940 downy mildew Peronospora sparsa Rubus argutus 'Black Satin' Leaf lesion with sparse sporulation on leaf underside
5487922 downy mildew Plasmopara viticola Vitis vinifera 'Chardonnay' Sporulation on underside of leaf
5487941 downy mildew Peronospora sparsa Rubus argutus 'Black Satin' Very subtle leaf lesions with sparse sporulation on leaf underside
5487942 downy mildew Peronospora sparsa Rubus argutus 'Black Satin' Leaf lesion with sparse sporulation on leaf underside
5487944 downy mildew Peronospora sparsa Rubus argutus 'Black Satin' Leaf lesion with sparse sporulation on leaf underside
5487943 downy mildew Peronospora sparsa Rubus argutus 'Black Satin' Leaf lesion with sparse sporulation on leaf underside
5487961 Pythium diseases Pythium spp. oospores in root tissue
5487945 downy mildew Peronospora sparsa Rubus argutus 'Black Satin' Leaf lesions
5487957 Pythium diseases Pythium spp. oospores in root tissue
5487958 Pythium diseases Pythium spp. oospores in root tissue
5487959 Pythium diseases Pythium spp. oospores in root tissue
5487960 Pythium diseases Pythium spp. oospores in root tissue
5487956 Pythium diseases Pythium spp. oospores in root tissue
5487937 Pythium diseases Pythium spp. off color foliage and wilting
1568019 Phytophthora blight Phytophthora nicotianae
1568020 Phytophthora blight Phytophthora nicotianae
1568021 Phytophthora root and crown rots Phytophthora spp.
5488177 downy mildew Peronospora spp. Symptomatic infected leaves
5488176 downy mildew Peronospora spp. Sporangia at sporangiophore tips
5488175 downy mildew Peronospora spp. Sporangiophore tips with sporangia
5488174 downy mildew Peronospora spp. Sporangiophores
5488173 downy mildew Peronospora spp. Sporangiophores
5488172 downy mildew Peronospora spp. Sporangiophore on leaf surface under dissecting scope
5488171 downy mildew Peronospora spp. Sporulation on leaf surface
5488170 downy mildew Peronospora spp. Sporulation on leaf surface
5485249 downy mildew Bremia lactucae Sporangiophores emerging from leaf tissue.
1572890 Phytophthora blight Phytophthora capsici Young pepper plant is wilting due to girdling of lower stem by Phytophthora capsici. Healthy plant on the right is the same age. May 1997
1572885 Phytophthora blight Phytophthora capsici Young pepper plant is wilting due to girdling of lower stem by Phytophthora capsici. May 1997
1572888 Phytophthora blight Phytophthora capsici Field of recently established pepper plants showing thinned out areas of the field where Phytophthora blight has killed plants. May 1997
1572887 Phytophthora blight Phytophthora capsici Lower stem lesion on pepper caused by Phytophthora capsici. May 1997?
1572886 Phytophthora blight Phytophthora capsici Young pepper plant is wilting due to girdling of lower stem by Phytophthora capsici. Healthy plant of the same age in the background. May 1997?
1572884 Phytophthora blight Phytophthora capsici Young pepper plant is wilting due to girdling of lower stem by Phytophthora capsici. May 1997
1572882 Phytophthora blight Phytophthora capsici Lower stem lesion on pepper caused by Phytophthora capsici. May 1997
1572878 downy mildew Hyaloperonospora parasitica Underside of cabbage leaf showing typical bright yellow lesions caused by downy mildew. Sporulation of the pathogen is found on the leaf underside. May 1997?
1572877 downy mildew Hyaloperonospora parasitica Cabbage leaf showing typical bright yellow lesions caused by downy mildew. May 1997?
1572876 downy mildew Hyaloperonospora parasitica Cabbage leaf showing early developing, bright yellow lesions caused by downy mildew. May 1997?
1572874 downy mildew Hyaloperonospora parasitica Cabbage leaf showing typical bright yellow lesions caused by downy mildew. May 1997
1572875 downy mildew Hyaloperonospora parasitica Cabbage leaf showing typical bright yellow lesions caused by downy mildew. May 1997?
1572873 downy mildew Hyaloperonospora parasitica Levels of disease severity (1-5) in cabbage caused by downy mildew.  Lower right leaf = 1, lower center = 2, lower right = 3, upper right = 4, upper left = 5. Such scales are inferior to estimates of % leaf area affected (e.g., 0-100%).  May 1997
5487807 Phytophthora blight Phytophthora capsici
5487808 Phytophthora blight Phytophthora capsici
5487809 Phytophthora blight Phytophthora capsici
5487810 Phytophthora blight Phytophthora capsici
5487806 Phytophthora blight Phytophthora capsici
5487752 downy mildew Pseudoperonospora cubensis
5487803 Phytophthora blight Phytophthora capsici
5487804 Phytophthora blight Phytophthora capsici
5487805 Phytophthora blight Phytophthora capsici
5487798 Phytophthora blight Phytophthora capsici
5487799 Phytophthora blight Phytophthora capsici
5487797 Phytophthora blight Phytophthora capsici
5487802 Phytophthora blight Phytophthora capsici
5487753 downy mildew Pseudoperonospora cubensis
5487754 downy mildew Pseudoperonospora cubensis
5486907 downy mildew Sclerophthora macrospora
5486908 downy mildew Sclerophthora macrospora
5483999 downy mildew Pseudoperonospora cubensis
5484001 downy mildew Pseudoperonospora cubensis
5484002 downy mildew Pseudoperonospora cubensis
5481818 Phytophthora blight Phytophthora capsici
5481798 Phytophthora blight Phytophthora capsici
5481799 Phytophthora blight Phytophthora capsici
5481800 Phytophthora blight Phytophthora capsici
5481801 Phytophthora blight Phytophthora capsici
5481802 Phytophthora blight Phytophthora capsici
5481803 Phytophthora blight Phytophthora capsici
5481804 Phytophthora blight Phytophthora capsici
5481805 Phytophthora blight Phytophthora capsici
5480008 downy mildew Pseudoperonospora cubensis
5480009 downy mildew Pseudoperonospora cubensis
5480010 downy mildew Pseudoperonospora cubensis
5480011 downy mildew Pseudoperonospora cubensis
5480012 downy mildew Pseudoperonospora cubensis
5480013 downy mildew Pseudoperonospora cubensis
5480014 downy mildew Pseudoperonospora cubensis
5480015 downy mildew Pseudoperonospora cubensis
5480016 downy mildew Pseudoperonospora cubensis
5480017 downy mildew Pseudoperonospora cubensis
5480018 downy mildew Pseudoperonospora cubensis
5480019 downy mildew Pseudoperonospora cubensis
5480020 downy mildew Pseudoperonospora cubensis
5480021 downy mildew Pseudoperonospora cubensis
5480022 downy mildew Pseudoperonospora cubensis
5480023 downy mildew Pseudoperonospora cubensis
5480024 downy mildew Pseudoperonospora cubensis
5480025 downy mildew Pseudoperonospora cubensis
5480026 downy mildew Pseudoperonospora cubensis
5480027 downy mildew Pseudoperonospora cubensis
5480028 downy mildew Pseudoperonospora cubensis
5480029 downy mildew Pseudoperonospora cubensis
5480030 downy mildew Pseudoperonospora cubensis
5480036 downy mildew Pseudoperonospora cubensis
5480037 downy mildew Pseudoperonospora cubensis
5480038 downy mildew Pseudoperonospora cubensis
5480039 downy mildew Pseudoperonospora cubensis
5480040 downy mildew Pseudoperonospora cubensis
5480041 downy mildew Pseudoperonospora cubensis
5480042 downy mildew Pseudoperonospora cubensis
5480043 downy mildew Pseudoperonospora cubensis
5481825 Phytophthora blight Phytophthora capsici
5481826 Phytophthora blight Phytophthora capsici
5481827 Phytophthora blight Phytophthora capsici
5481828 Phytophthora blight Phytophthora capsici
5481829 Phytophthora blight Phytophthora capsici
5481830 Phytophthora blight Phytophthora capsici
5481831 Phytophthora blight Phytophthora capsici
5481832 Phytophthora blight Phytophthora capsici
5481833 Phytophthora blight Phytophthora capsici
5481834 Phytophthora blight Phytophthora capsici
5481835 Phytophthora blight Phytophthora capsici
5481836 Phytophthora blight Phytophthora capsici
5481837 Phytophthora blight Phytophthora capsici
5481838 Phytophthora blight Phytophthora capsici
5481839 Phytophthora blight Phytophthora capsici
5481840 Phytophthora blight Phytophthora capsici
5481841 Phytophthora blight Phytophthora capsici
5481842 Phytophthora blight Phytophthora capsici
5481843 Phytophthora blight Phytophthora capsici
5481844 Phytophthora blight Phytophthora capsici
5481845 Phytophthora blight Phytophthora capsici
5481846 Phytophthora blight Phytophthora capsici
5481847 Phytophthora blight Phytophthora capsici
5479986 downy mildew Pseudoperonospora cubensis
5479987 downy mildew Pseudoperonospora cubensis
5479988 downy mildew Pseudoperonospora cubensis
5479989 downy mildew Pseudoperonospora cubensis
5479990 downy mildew Pseudoperonospora cubensis
5479991 downy mildew Pseudoperonospora cubensis
5479992 downy mildew Pseudoperonospora cubensis
5479993 downy mildew Pseudoperonospora cubensis
5481806 Phytophthora blight Phytophthora capsici
5481807 Phytophthora blight Phytophthora capsici
5481808 Phytophthora blight Phytophthora capsici
5481809 Phytophthora blight Phytophthora capsici
5481810 Phytophthora blight Phytophthora capsici
5481811 Phytophthora blight Phytophthora capsici
5481812 Phytophthora blight Phytophthora capsici
5481813 Phytophthora blight Phytophthora capsici
5481814 Phytophthora blight Phytophthora capsici
5481815 Phytophthora blight Phytophthora capsici
5481816 Phytophthora blight Phytophthora capsici
5481817 Phytophthora blight Phytophthora capsici
1573006 Pythium diseases Pythium spp. Pythium oospore (faint round structure in center of frame) in watermelon root tissue.  Phase contrast. May 1997
1573005 Pythium diseases Pythium spp. Oospore of Pythium sp. in watermelon root tissue. May 1997
5485740 downy mildew Plasmopara obducens
5485741 downy mildew Plasmopara obducens
5485737 downy mildew Plasmopara obducens
5485738 downy mildew Plasmopara obducens
5485739 downy mildew Plasmopara obducens
5485035 downy mildew Plasmopara viticola Infected fruit with obvious signs
5485034 downy mildew Plasmopara viticola Tips of sporangiophore
5485032 downy mildew Plasmopara viticola Sporangium
5485033 downy mildew Plasmopara viticola Sporangium
5485031 downy mildew Plasmopara viticola Sporangiophores
5485030 downy mildew Plasmopara viticola Sporangiophores
5485029 downy mildew Plasmopara viticola Sporangia evident on infected fruit
5485028 downy mildew Plasmopara viticola Pathogen emerging from infected fruit
5483129 Philippine downy mildew Peronosclerospora philippinensis
5483035 downy mildew Peronospora lamii
5483036 downy mildew Peronospora lamii
5483037 downy mildew Peronospora lamii
5483038 downy mildew Peronospora lamii
5483128 Philippine downy mildew Peronosclerospora philippinensis
5483126 Philippine downy mildew Peronosclerospora philippinensis
5483127 Philippine downy mildew Peronosclerospora philippinensis
5479886 Phytophthora blight Phytophthora nicotianae blackening of stem near base of plant beneath bark and aboveground symptoms
5479914 downy mildew Plasmopara belbahrii Downy mildew symptoms on upper leaf surface
5479915 downy mildew Plasmopara belbahrii Downy mildew symptoms on upper leaf surface
5479916 downy mildew Plasmopara belbahrii sporulation on undersides of leaves
5479898 late blight Phytophthora infestans leaf spots
5479899 late blight Phytophthora infestans fruit lesions
5479849 late blight Phytophthora infestans Sporangiophores on leaf tissue
5479850 late blight Phytophthora infestans Sporangiophore
5479853 late blight Phytophthora infestans Sporangia and sporangiophore
5479855 Phytophthora root rot Phytophthora cinnamomi Sporangia
5479856 Phytophthora root rot Phytophthora cinnamomi Sporangia
5479857 Phytophthora root rot Phytophthora cinnamomi Grape-like clusters of hyphal swellings
5479865 late blight Phytophthora infestans Sporangia
5479866 late blight Phytophthora infestans Sporangiophore with sporangia attached
5411430 Phytophthora blight Phytophthora capsici sporangia (lemon-shaped) and motile zoospores (roundish) of Phytophthora
5411431 Phytophthora blight Phytophthora capsici sporangia (lemon-shaped) and motile zoospores (roundish) of Phytophthora
5479929 late blight Phytophthora infestans stem cankers
5479930 late blight Phytophthora infestans stem cankers
5479932 late blight Phytophthora infestans Lesions on fruit--note white sporulation of Phytophthora infestans
5479900 late blight Phytophthora infestans fruit lesion with white sporulation
5479917 Phytophthora root rot Phytophthora cinnamomi DiebackCultivar is 'Densa' 
5479918 Phytophthora root rot Phytophthora cinnamomi Blackening of stem near base of plantCultivar is 'Densa' 
5479919 Phytophthora root rot Phytophthora cinnamomi Blackening of stem near base of plantCultivar is 'Densa' 
5479844 downy mildew Plasmopara viticola Sporulation on underside of leafcultivar is 'Buffalo'
5479845 downy mildew Plasmopara viticola Sporulation is on underside of leafcultivar is 'Buffalo'
5479846 downy mildew Plasmopara viticola Sporulation on underside of leafcultivar is 'Buffalo'
5479847 downy mildew Plasmopara viticola Symptoms on underside of leafcultivar is 'Buffalo'
5479848 downy mildew Plasmopara viticola Sporulation on underside of leafcultivar is 'Buffalo'
5479939 damping-off/root rot Aphanomyces cochlioides Aphanomyces root rot external symptoms on mature beet
5479940 damping-off/root rot Aphanomyces cochlioides Aphanomyces root rot external symptoms on mature beet, superficial scaring
5479935 damping-off/root rot Aphanomyces cochlioides Aphanomyces root rot external symptoms on mature beet
5479936 damping-off/root rot Aphanomyces cochlioides Aphanomyces root rot external symptoms on mature beet
5479937 damping-off/root rot Aphanomyces cochlioides Aphanomyces seedlings damping-off
5479938 damping-off/root rot Aphanomyces cochlioides Aphanomyces seedlings damping-off
5479941 damping-off/root rot Aphanomyces cochlioides Aphanomyces seedlings damping-off
5479942 damping-off/root rot Aphanomyces cochlioides Aphanomyces seedlings damping-off
5411429 Phytophthora blight Phytophthora capsici sporangia (lemon-shaped) and motile zoospores (roundish) of Phytophthora
5475050 Pythium diseases Pythium spp. Pythium root rot on lentil: note lack of secondary roots, brown discoloration, and the cortex was stripped off of the inner stele of the root.? Varying levels of damage.
5475049 Pythium diseases Pythium spp. Pythium root rot on lentil: note lack of secondary roots, brown discoloration, and the cortex was stripped off of the inner stele of the root.
5473713 Phytophthora root and crown rots Phytophthora spp. Buckeye rot lesions on tomato fruit close to the ground.
1427028 sudden oak death Phytophthora ramorum China Camp State Park, California
5473575 Root and stem rot Phytophthora sojae Phytophthora root and stem rot
5472517 Pythium diseases Pythium spp.
5472860 downy mildew Plasmopara obducens Plasmopara obducens sporulating on the lower leaf surface of an infected leaf.
5472859 downy mildew Plasmopara obducens Chlorosis of impatiens leaves with downy mildew.
5472854 downy mildew Plasmopara obducens Downy mildew of impatiens caused by Plasmopara obducens.
1572619 downy mildew Hyaloperonospora parasitica Downy mildew sporulation on the underside of a broccoli leaf. January 1997
1572618 downy mildew Hyaloperonospora parasitica Downy mildew lesions on the upper side of a broccoli leaf. January 1997
1572617 downy mildew Hyaloperonospora parasitica Downy mildew lesions on the upper side of a broccoli leaf. January 1997
1572616 downy mildew Hyaloperonospora parasitica Downy mildew lesions on the upper side of a broccoli leaf. January 1997
1572615 downy mildew Hyaloperonospora parasitica Sporulation of downy mildew on the underside of a broccoli leaf. January 1997
1572544 downy mildew Peronospora trifoliorum Symptoms of downy mildew on the uppecr leaf surface. January 1997
1572543 downy mildew Peronospora trifoliorum Symptoms of downy mildew on the lower leaf surface. January 1997
1572542 downy mildew Peronospora trifoliorum Symptoms of downy mildew on the lower leaf surface. January 1997
1572541 downy mildew Peronospora trifoliorum Symptoms of downy mildew on the lower leaf surface. January 1997
1572540 downy mildew Peronospora trifoliorum Symptoms of downy mildew on the lower leaf surface. January 1997
1572539 downy mildew Peronospora trifoliorum Symptoms of downy mildew on the upper leaf surface. January 1997
1572538 downy mildew Peronospora trifoliorum Symptoms of downy mildew on the upper leaf surface. January 1997
1572537 downy mildew Peronospora trifoliorum Symptoms of downy mildew on the upper leaf surface. January 1997
5474060 Phytophthora blight Phytophthora nicotianae Empty sporangium and hyphae with mobile zoospores (seen as specks throughout field of view) Wide range of hosts: More than 100 plant genera
5474061 Phytophthora blight Phytophthora nicotianae Hyphae and encysted zoospores (seen as spherical objects near hyphal mass) Wide range of host: More than 100 plant genera
5474062 Phytophthora blight Phytophthora nicotianae Sporangia derived from hyphae; encysted zoospores visible throughout field of view Wide range: more than 100 plant genera
5474065 Phytophthora blight Phytophthora nicotianae Sporangia and their stalks Wide range of host: More than 100 plant genera
5474066 Phytophthora blight Phytophthora nicotianae Sporangia with stalks detached from hyphal mass (note ostiole on the apex of the sporangium second from the left) Wide range of host: More than 100 plant genera
5474067 Phytophthora blight Phytophthora nicotianae Sporangia and their stalks; detached from hyphal massWide range: More than 100 plant genera
5474189 Phytophthora blight Phytophthora nicotianae Sporangium and stalk Wide host range
5472853 Phytophthora root and crown rots Phytophthora spp. Buckeye rot of tomato caused by Phytophthora sp.
1568027 late blight Phytophthora infestans
1568028 late blight Phytophthora infestans
1568029 late blight Phytophthora infestans
1568022 late blight Phytophthora infestans
1568023 late blight Phytophthora infestans
1568024 late blight Phytophthora infestans
1568030 late blight Phytophthora infestans
1568031 late blight Phytophthora infestans
1568032 late blight Phytophthora infestans
1568033 late blight Phytophthora infestans
1568034 late blight Phytophthora infestans
1568035 late blight Phytophthora infestans
1568065 Phytophthora blight Phytophthora capsici
1568066 Phytophthora blight Phytophthora capsici
5458604 basil downy mildew Peronospora belbahrii Sporangiophores and sporangia
5458605 basil downy mildew Peronospora belbahrii Sporangiophores
5458606 basil downy mildew Peronospora belbahrii Sporangiophore
5458607 basil downy mildew Peronospora belbahrii Sporangium
5458608 basil downy mildew Peronospora belbahrii Sporangia
5458609 basil downy mildew Peronospora belbahrii Infected plant
5458610 basil downy mildew Peronospora belbahrii Infected plant
5458611 basil downy mildew Peronospora belbahrii Infected plant
1571979 downy mildew Bremia lactucae Angular chlorotic lesions caused by lettuce downy mildew. Sporulation occurs on the leaf underside (see 1571977 for corresponding topside of leaf). February 1996
1571978 downy mildew Bremia lactucae Angular chlorotic lesions caused by lettuce downy mildew. Sporulation occurs on the leaf underside (see 1571977 for corresponding topside of leaf). February 1996
1571977 downy mildew Bremia lactucae Angular chlorotic lesions caused by lettuce downy mildew. Sporulation occurs on the leaf underside (see 1571978 for corresponding underside of leaf). February 1996
1571976 downy mildew Bremia lactucae Angular chlorotic lesions caused by lettuce downy mildew. Note the white sporulation occurring on the leaf underside. February 1996
1571975 downy mildew Bremia lactucae Angular chlorotic lesions caused by lettuce downy mildew. February 1996
1571974 downy mildew Bremia lactucae Angular chlorotic lesions caused by lettuce downy mildew. February 1996
1571938 downy mildew Peronospora destructor Downy mildew lesion on onion leaf showing broad chlorosis with difuse margins. Sporulation is greatest on tissue that is still somewhat green.  February 1996
1571939 downy mildew Peronospora destructor Downy mildew lesion on onion leaf showing broad chlorosis with difuse margins. Sporulation is greatest on tissue that is still somewhat green.  February 1996
1571937 downy mildew Peronospora destructor Downy mildew lesion on onion leaf showing broad chlorosis with difuse margins. Sporulation is greatest on tissue that is still somewhat green.  February 1996
1571936 downy mildew Peronospora destructor Downy mildew lesion on onion leaf showing broad chlorosis with difuse margins. Sporulation is greatest on tissue that is still somewhat green.  February 1996
1571934 downy mildew Peronospora destructor Downy mildew lesion on onion leaf showing broad chlorosis with difuse margins. Tan spots on leaves are not caused by downy mildew. February 1996
1571935 downy mildew Peronospora destructor Downy mildew lesion on onion leaf showing broad chlorosis with difuse margins. Tan spots on leaves are not caused by downy mildew. February 1996
1571933 downy mildew Peronospora destructor Leaf tip necrosis and sporulation of Peronospora destructor on onion leaf. Tan spots on leaves are not caused by downy mildew. February 1996
1571932 downy mildew Peronospora destructor Leaf tip necrosis and sporulation of Peronospora destructor on onion leaf. Tan spots on leaves are not caused by downy mildew. February 1996
1571931 downy mildew Peronospora destructor Abundant sporulation of Peronospora destructor on onion leaf. February 1996
1571930 downy mildew Peronospora destructor Abundant sporulation of Peronospora destructor on onion leaf. February 1996
1571929 downy mildew Peronospora destructor Abundant sporulation of Peronospora destructor on onion leaf. February 1996
1571734 downy mildew Peronospora farinosa Sporulation of Peronospora farinosa on spinach leaf. December 1995
5262083 Phytophthora tropicalis Phytophthora tropicalis
5454394 downy mildew Peronospora parasitica sporangia and  sporangiophores of Peronospora parasitica
5454393 downy mildew Peronospora parasitica sporangia and  sporangiophore of Peronospora parasitica
5454392 downy mildew Peronospora parasitica sporangia and  sporangiophores of Peronospora parasitica
5454391 downy mildew Peronospora parasitica sporangia and  sporangiophores of Peronospora parasitica
5402274 downy mildew Pseudoperonospora cubensis
5402275 downy mildew Pseudoperonospora cubensis
5402276 downy mildew Pseudoperonospora cubensis
5257093 late blight Phytophthora infestans
5043025 sudden oak death Phytophthora ramorum
5043027 sudden oak death Phytophthora ramorum
5043028 sudden oak death Phytophthora ramorum
5043029 sudden oak death Phytophthora ramorum
5043030 sudden oak death Phytophthora ramorum
5043020 sudden oak death Phytophthora ramorum
5043023 sudden oak death Phytophthora ramorum
5043024 sudden oak death Phytophthora ramorum
5470382 basil downy mildew Peronospora belbahrii Pathogen produces dark spores on the underside of leaves opposite symptoms on the upper surface.
5470383 basil downy mildew Peronospora belbahrii Initial symptoms of downy mildew on upper surface of leaves is chlorosis occurring usually in sections because the pathogen cannot grow past major veins in the leaf.
5470381 late blight Phytophthora infestans Large leaf spots often with a light green border are typical for late blight.
5470380 late blight Phytophthora infestans Sporulation of the pathogen, Phytophthora infestans, visible on the underside of the leaflet.
1571111 downy mildew Peronospora farinosa Spinach leaf showing angular chlorotic lesions caused by the pathogen Peronospora farinosa. March 1995
1571109 downy mildew Peronospora farinosa Spinach leaves showing angular chlorotic lesions caused by the pathogen Peronospora farinosa. March 1995
1571110 downy mildew Peronospora farinosa Spinach leaf showing angular chlorotic lesions caused by the pathogen Peronospora farinosa. March 1995
1571107 downy mildew Peronospora farinosa Spinach leaf showing angular chlorotic lesions caused by the pathogen Peronospora farinosa. March 1995
1571108 downy mildew Peronospora farinosa Underside of spinach leaf showing sporulation of the pathogen (Peronospora farinosa). March 1995
1571106 downy mildew Peronospora farinosa Underside of spinach leaf showing sporulation of the pathogen (Peronospora farinosa). March 1995
1571070 downy mildew Peronospora destructor The primary disease is downy mildew.  However, some Stemphylium leaf blight is also present.  March 1995
5465807 Root and stem rot Phytophthora sojae
5465808 Root and stem rot Phytophthora sojae
5465809 Root and stem rot Phytophthora sojae
5465800 Root and stem rot Phytophthora sojae
5465803 Root and stem rot Phytophthora sojae
5465804 Root and stem rot Phytophthora sojae
5465805 Root and stem rot Phytophthora sojae
5465806 Root and stem rot Phytophthora sojae
5465801 Root and stem rot Phytophthora sojae
5465802 Root and stem rot Phytophthora sojae
5465798 Root and stem rot Phytophthora sojae
5465799 Root and stem rot Phytophthora sojae
5465818 downy mildew Peronospora manshurica
5465819 downy mildew Peronospora manshurica
5465820 downy mildew Peronospora manshurica
5465821 downy mildew Peronospora manshurica
5465812 downy mildew Peronospora manshurica
5465813 downy mildew Peronospora manshurica
5465814 downy mildew Peronospora manshurica
5465815 downy mildew Peronospora manshurica
5465816 downy mildew Peronospora manshurica
5465817 downy mildew Peronospora manshurica
5465810 downy mildew Peronospora manshurica
5465811 downy mildew Peronospora manshurica
5465595 downy mildew Sclerophthora macrospora
5465591 downy mildew Sclerophthora macrospora
5465592 downy mildew Sclerophthora macrospora
5465593 downy mildew Sclerophthora macrospora
5465594 downy mildew Sclerophthora macrospora
5465589 downy mildew Sclerophthora macrospora
5465590 downy mildew Sclerophthora macrospora
5465584 downy mildew Sclerophthora macrospora
5465585 downy mildew Sclerophthora macrospora
5465586 downy mildew Sclerophthora macrospora
5465587 downy mildew Sclerophthora macrospora
5465588 downy mildew Sclerophthora macrospora
5465580 downy mildew Sclerophthora macrospora
5465581 downy mildew Sclerophthora macrospora
5465582 downy mildew Sclerophthora macrospora
5465583 downy mildew Sclerophthora macrospora
5458787 downy mildew Peronospora spp. Sporangia
5458785 downy mildew Peronospora spp. Sporangiophores
5458786 downy mildew Peronospora spp. Sporangia
5458784 downy mildew Peronospora spp. Sporangia on sporangiophore
5458782 downy mildew Peronospora spp. Sporangiophores
5458783 downy mildew Peronospora spp. Sporangia
5458781 downy mildew Peronospora spp. Sporangiophore
5458779 downy mildew Peronospora spp. Sporangiophores evident on infected leaf
5458780 downy mildew Peronospora spp. Sporangiophores evident on infected leaf
5458778 downy mildew Peronospora spp. Sporangiophores evident on infected leaf
5458777 downy mildew Peronospora spp. Sporangiophores evident on infected leaf
5458776 downy mildew Peronospora spp. Sporangiophores evident on infected leaf
5457957 late blight Phytophthora infestans Sporangia of Phytophthora infestans.
5457968 late blight Phytophthora infestans Sporangia of Phytophthora infestans.
5458686 downy mildew Peronospora sparsa Sporangia.
5458685 downy mildew Peronospora sparsa Sporangia.
5458715 downy mildew Plasmopara viburni Lesions on the underside of a leaf. Note how many individual lesions appear angular as lesions develop between small leaf veins.
5458716 downy mildew Plasmopara viburni Close view of adjacent lesions on the underside of a leaf. Sparser white growth is the least mature.
5458712 downy mildew Plasmopara viburni Close-up view of lesions on the underside of a leaf.
5458713 downy mildew Plasmopara viburni Fruiting bodies developing along a vein on the underside of the leaf.
5458714 downy mildew Plasmopara viburni Lesions on the upper surface of a leaf.
5458711 downy mildew Plasmopara viburni Lesions on the underside of a leaf.
5458079 basil downy mildew Peronospora belbahrii sporangia
5458086 basil downy mildew Peronospora belbahrii Masses of purplish sporangia on the undersurface of a leaf.
5458087 basil downy mildew Peronospora belbahrii Masses of purplish sporangia on the undersurface of a leaf.
5458091 basil downy mildew Peronospora belbahrii Heavy spore production on the undersurface of the leaf may look like dust or dirt on the tissue.
5458092 basil downy mildew Peronospora belbahrii A closer view of a lesion with dense sporulation that looks like a grayish-purple mold on the leaf.
5458080 basil downy mildew Peronospora belbahrii Sporangia
5402940 late blight Phytophthora infestans Fungicide trial on potatoes with late blight. Dithane D-14 plus zinc sulfate applied at 3.2 qts./a. every 7 days from July 12 to September 6, 1954.
5427733 Phytophthora blight Phytophthora nicotianae Various stages of symptoms due to Phytophthora crown and root rot on gloxinia transplants
5438913 damping-off/root rot Aphanomyces cochlioides
5388286 Phytophthora root rot Phytophthora cinnamomi Shrubs affected by phytophthora root rot.
1427068 sudden oak death Phytophthora ramorum Dried ooze caused by bleeding from P. ramorum infection on coast live oak.
5443056 Pythium diseases Pythium spp.
1440043 Pythium diseases Pythium spp. Stem rot occurs on tobacco transplants shortly after they are set in the field. Stem rot may begin in the plant bed and be moved to the field on infected transplants, or it may begin after plants are set in the field. The development of stem rot is sporadic, being favored by wet weather and injured plants. Under favorable conditions, Pythium attacks the stems of newly set plants causing brown, watery lesions to develop near the soil line. As the fungus disease develops, stem tissue collapse and disintegrate, causing death of the plant. Stem rot usually appears as a watery soft rot; a cottony fungus mass may be present. Stem rot may be confused with sore shin or black shank, thus requiring microscopic examination for confirmation.
1427003 sudden oak death Phytophthora ramorum
5443057 downy mildew Peronospora sparsa
5408689 Phytophthora blight Phytophthora nicotianae Wilt and stem rot Pathogen type: Oomycete
5408695 downy mildew Peronospora phlogina Leaf necrosis Pathogen type: Fungus
5408656 downy mildew Peronospora lamii Leaf necrosis Pathogen type: Oomycete
5408657 downy mildew Peronospora lamii Leaf necrosis Pathogen type: Oomycete
5408658 downy mildew Peronospora lamii Leaf necrosis Pathogen type: Oomycete
5408659 downy mildew Peronospora lamii Leaf necrosis Pathogen type: Oomycete
5408660 downy mildew Peronospora lamii Leaf necrosis Pathogen Type: Oomycete
5408661 downy mildew Peronospora lamii Leaf necrosis Pathogen type: Oomycete
5408655 downy mildew Peronospora lamii Leaf necrosis Pathogen type: Oomycete
1427001 sudden oak death Phytophthora ramorum
1427054 sudden oak death Phytophthora ramorum Canker and zone lines caused by P. ramorum.
1415156 Phytophthora root and crown rot Phytophthora cambivora On oak leaves as baiting trap. Sept. 13, 2002
1436011 downy mildew Peronospora manshurica
1236097 Phytophthora root rot Phytophthora cinnamomi
1236098 Phytophthora root rot Phytophthora cinnamomi
2651047 Phytophthora root rot Phytophthora cinnamomi root decay (bark intact)- base of stem. Union County, North Carolina
1137032 Phytophthora root disease of Port Orford cedar Phytophthora lateralis Dying tree, upper Sacramento River, California.
0745018 Phytophthora root rot Phytophthora cinnamomi
0745019 Phytophthora root rot Phytophthora cinnamomi
0745017 Phytophthora root rot Phytophthora cinnamomi
0656018 downy mildew Plasmopara halstedii A sporangiophore with sporangia arising from a cotyledon of sunflower systemically infected with Plasmopara halstedii.
5411428 Phytophthora blight Phytophthora capsici sporangia (lemon-shaped) and motile zoospores (roundish) of Phytophthora
1402019 blue mold Peronospora tabacina Blue mold can occur in the plant bed or field. Circular yellow spots up to one inch in diameter develop on the leaves. Blue-gray fungal growth is produced on the underside of these spots when the fungus is active. Spots become light brown when the leaf tissue dies. The disease first develops on lower leaves, but it rapidly spreads to upper leaves during wet, cool weather.
1235009 Phytophthora blight Phytophthora nicotianae
1234222 downy mildew Plasmopara viticola
1427102 sudden oak death Phytophthora ramorum Bark cracks and bleeding on coast live oak.
1427095 sudden oak death Phytophthora ramorum Coast live oak mortality from P. ramorum infection at China Camp State Park, CA.
1427071 sudden oak death Phytophthora ramorum Coast live oak dying from P. ramorum infection, China Camp State Park, CA.
1427048 sudden oak death Phytophthora ramorum Tanoak dying from P. ramorum infection, Muir Woods State Park, CA.
1427052 sudden oak death Phytophthora ramorum Tanoak dying from P. ramorum infection, Muir Woods State Park, CA.
1427050 sudden oak death Phytophthora ramorum Tanoak sprouts dying from P. ramorum infection.
1427046 sudden oak death Phytophthora ramorum
1427047 sudden oak death Phytophthora ramorum Tip dieback caused by P. ramorum on tanoak.
1427034 sudden oak death Phytophthora ramorum
1427033 sudden oak death Phytophthora ramorum
1427035 sudden oak death Phytophthora ramorum Big Sur, California
1427041 sudden oak death Phytophthora ramorum Big Sur, California
1427020 sudden oak death Phytophthora ramorum Big Sur, California
1427021 sudden oak death Phytophthora ramorum Big Sur, California
1427023 sudden oak death Phytophthora ramorum Big Sur, California
0454035 Red stele root rot of strawberry Phytophthora fragariae fragariae Strawberry runner root system infected by Phytophthora fragariae var. fragariae, showing typical rat's tail appearance.
0364080 Phytophthora root and crown rots Phytophthora spp. on Fraser fir in nursery
4823085 Phytophthora root rot Phytophthora cinnamomi Mortality of 2-0 bareroot stock in Munson Forest Nursery, Florida, USA.
4823079 Phytophthora root rot Phytophthora cinnamomi Mortality in four year old plantation.
4823081 Phytophthora root rot Phytophthora cinnamomi Mortality of 2-0 stock in Munson Forest Nursery, Florida, USA
1427019 sudden oak death Phytophthora ramorum Big Sur, California
1427004 sudden oak death Phytophthora ramorum
0488102 Phytophthora root rot Phytophthora cinnamomi injury to young tree
0027064 blue mold Peronospora tabacina
1427016 sudden oak death Phytophthora ramorum Big Sur, California
1427109 sudden oak death Phytophthora ramorum
1571333 late blight Phytophthora infestans Light micrograph of Phytophthora infestans from potato leaf.  Small, dark, football-shaped bodies are sporangia. June 1995
1571334 late blight Phytophthora infestans Light micrograph of Phytophthora infestans from potato leaf.  Small, dark, football-shaped bodies are sporangia. June 1995
5440168 Pythium root and stem rot Pythium aphanidermatum 12/12 light/dark at 27C Top of culture on Day 6
5440166 Pythium root and stem rot Pythium aphanidermatum 12/12 light/dark at 27C Top of culture on Day 4
5440167 Pythium root and stem rot Pythium aphanidermatum 12/12 light/dark at 27C Bottom of culture on Day 6
5440165 Pythium root and stem rot Pythium aphanidermatum 12/12 light/dark at 27C Bottom of culture on Day 4
5440164 Pythium root and stem rot Pythium aphanidermatum 12/12 light/dark at 27C Top of culture on Day 2
5440163 Pythium root and stem rot Pythium aphanidermatum 12/12 light/dark at 27C Bottom of culture on Day 2
1427051 sudden oak death Phytophthora ramorum Tanoak sprouts dying from P. ramorum infection.
1427022 sudden oak death Phytophthora ramorum Big Sur, California
5439440 downy mildew Peronospora sparsa Downy mildew symptoms on Knock-out rose, Rosa spp. 'Radtko'.
1415158 Phytophthora root and crown rot Phytophthora cambivora Sept. 13, 2002
5438912 damping-off/root rot Aphanomyces cochlioides
5438914 damping-off/root rot Aphanomyces cochlioides
5438915 damping-off/root rot Aphanomyces cochlioides
5438916 damping-off/root rot Aphanomyces cochlioides
5430088 Phytophthora blight Phytophthora capsici Sporangia of Phytophthora capsici
5430089 Phytophthora blight Phytophthora capsici Sporangia of Phytophthora capsici
5430090 Phytophthora blight Phytophthora capsici Sporangia of Phytophthora capsici
5430047 Phytophthora blight Phytophthora capsici Sporangia of Phytophthora capsici
5430087 Phytophthora blight Phytophthora capsici Infected 'Queensland Blue' pumpkin showing mycelium of Phytophthora capsici.
5430086 Phytophthora blight Phytophthora capsici Infected 'Queensland Blue' pumpkin showing mycelium of Phytophthora capsici.
5430085 Phytophthora blight Phytophthora capsici Infected 'Queensland Blue' pumpkin showing mycelium of Phytophthora capsici.
5430084 Phytophthora blight Phytophthora capsici Infected 'Queensland Blue' pumpkin showing mycelium of Phytophthora capsici.
1402040 Phytophthora blight Phytophthora nicotianae Black shank infection may occur on lower leaves of a plant due to spores being splashed onto them by hard rains. Large lesions (up to 3 inches) with a greenish-brown to yellow color are formed on the infected leaves.
1427080 sudden oak death Phytophthora ramorum Tanoak dying from P. ramorum infection, Muir Woods State Park, CA.
1427096 sudden oak death Phytophthora ramorum Tanoak dying from P. ramorum infection at Muir Woods.
1427049 sudden oak death Phytophthora ramorum Tanoak dying from P. ramorum infection.
5021075 Phytophthora root rot Phytophthora cactorum dieback
5021073 Phytophthora root rot Phytophthora cactorum dieback
5021072 Phytophthora root rot Phytophthora cactorum mortality
5077053 Phytophthora blight Phytophthora capsici Brown, sunken, irregular shaped splotches with dark centers. Whitish mold may be observed when fungus is active. Splotches eventually begin to rot, especially during shipment. Unlike fruit blotch lesions, these lesions are soft.
1440015 blue mold Peronospora tabacina Blue mold may occur on the plant anytime from seedling to harvest; however, young tissue is more susceptible than old tissue. The first evidence of blue mold in the field usually occurs on the leaves as yellow circular spots about the size of a nickel. The spots soon develop the characteristic bluish, downy fungal growth on the undersides of the leaves which is best seen in the morning when the leaf is wet. If spots develop on leaves that are expanding, a puckering of the leaf occurs. As spots age, they turn from yellow to tan or brown and often tear or drop out. If infection has occurred near or on a leaf vein, a localized systematic infection may occur. The affected vein becomes reddish-brown, and the area around the vein is yellowed and distorted. In newly set transplants, it is possible for the fungus to develop systematically, killing the main bud and resulting in stunting or death of the plant. Splitting the stalk of systematically infected plants reveals a reddish- brown discoloration in the vascular tissue beneath the epidermis. A one-sided systemically infection also occur, resulting in a deformed stalk and lodging of affected plants. During weather favorable for blue mold (cool, cloudy, and wet), the disease can develop rapidly, causing numerous leaf lesions which can result in leaf blighting and severe leaf loss. The disease may develop during hot, humid periods if cool nights exist.
1427110 sudden oak death Phytophthora ramorum
0027049 Phytophthora blight Phytophthora nicotianae
1415159 Phytophthora root and crown rot Phytophthora cambivora Sept. 13, 2002
1402003 blue mold Peronospora tabacina Blue mold is shown above in a plant bed, but it can also occur in the field.
1427083 sudden oak death Phytophthora ramorum Zone lines of P. ramorum on coast live oak.
1427030 sudden oak death Phytophthora ramorum
0027062 blue mold Peronospora tabacina
1371011 Phytophthora root and crown rot Phytophthora cambivora Stand symptoms. Story, Germany
4822078 Phytophthora basal canker Phytophthora palmivora Droplets of discolored sap exuding from infected bark tissues.
4822082 Phytophthora basal canker Phytophthora palmivora canker initially 30 inches off ground, 6 months later - 11 feet off ground as infection progresses into tree stem and scaffold branches
1235233 Phytophthora root rot Phytophthora cinnamomi
1235083 pod rot Pythium myriotylum
1233227 Pythium diseases Pythium spp. Rhizoctonia spp. injury (left and right) and Pythium spp. injury in center to young seedlings. Damping off is a problem in tobacco plant beds but can be a problem in the field soon after transplanting. Pythium spp. causes a watery, soft rot of the lower stem and root system and is more common during cool, wet weather. Rhizoctonia causes brown, irregular cankers to develop on the lower stems and injury is more common during warm weather. Lesions can enlarge and girdle the stem while plants that are not severely damaged by Rhizoctonia may recover in the field.
1234165 downy mildew Pseudoperonospora cubensis lower leaf surface
1235006 Phytophthora blight Phytophthora nicotianae
1235079 Phytophthora blight Phytophthora nicotianae
1235078 Phytophthora blight Phytophthora nicotianae
1371017 Phytophthora root and crown rot Phytophthora cambivora Necrosis on the roots and root collar. Story, Germany
1427036 sudden oak death Phytophthora ramorum
4822077 Phytophthora basal canker Phytophthora palmivora Basal canker (6 feet off the ground) with dark staining and discoloration of infected bark. Naples, Florida, USA
4824002 Phytophthora root rot Phytophthora cinnamomi Mortality in 13-year old stand.
1149208 Phytophthora blight Phytophthora nicotianae 1976
1436067 pod rot Pythium myriotylum
1415155 Phytophthora root and crown rot Phytophthora cambivora Bark necrosis of root collar. Sept. 13, 2002
1427112 sudden oak death Phytophthora ramorum
4824003 Phytophthora root rot Phytophthora cinnamomi Mortality in 4-year old stand
1371014 Phytophthora root and crown rot Phytophthora cambivora Tar spots, with bark removed. Lesse, Germany
1436123 downy mildew Pseudoperonospora cubensis lower leaf surface
1440050 Phytophthora blight Phytophthora nicotianae Black shank is primarily a disease of the roots and the lower stalk of the tobacco. The symptoms of black shank vary with weather conditions, age of plants, stage of disease development, degree of plant resistance, and virulence of the soil-borne fungal pathogen. Stunting is often the first symptom of black shank, but the disease is seldom recognized until plants wilt. At first, wilted plants will recover in the evening hours, but later become permanently wilted, with leaves turning yellow and hanging down the stalk. During the early stages of disease development, an examination of the plant will show a black discoloration of one or more of the larger roots and the interior of the lower stalk. As the disease progresses, the lower part of the stalk becomes black near the soil line, hence the name black shank. In advanced stages of the disease, the tissues in the center of the lower stalk become blackened, and as the pith dries, it becomes segmented into discs.
2733025 Phytophthora root rot Phytophthora cinnamomi fading crowns, numerous cones, and short stunted needles and twigs
1235077 Phytophthora blight Phytophthora nicotianae
1427053 sudden oak death Phytophthora ramorum Tip symptoms on tanoak seedling, caused by P. ramorum.
1440049 Phytophthora blight Phytophthora nicotianae Black shank is primarily a disease of the roots and the lower stalk of the tobacco. The symptoms of black shank vary with weather conditions, age of plants, stage of disease development, degree of plant resistance, and virulence of the soil-borne fungal pathogen. Stunting is often the first symptom of black shank, but the disease is seldom recognized until plants wilt. At first, wilted plants will recover in the evening hours, but later become permanently wilted, with leaves turning yellow and hanging down the stalk. During the early stages of disease development, an examination of the plant will show a black discoloration of one or more of the larger roots and the interior of the lower stalk. As the disease progresses, the lower part of the stalk becomes black near the soil line, hence the name black shank. In advanced stages of the disease, the tissues in the center of the lower stalk become blackened, and as the pith dries, it becomes segmented into discs.
1440051 Phytophthora blight Phytophthora nicotianae Black shank is primarily a disease of the roots and the lower stalk of the tobacco. The symptoms of black shank vary with weather conditions, age of plants, stage of disease development, degree of plant resistance, and virulence of the soil-borne fungal pathogen. Stunting is often the first symptom of black shank, but the disease is seldom recognized until plants wilt. At first, wilted plants will recover in the evening hours, but later become permanently wilted, with leaves turning yellow and hanging down the stalk. During the early stages of disease development, an examination of the plant will show a black discoloration of one or more of the larger roots and the interior of the lower stalk. As the disease progresses, the lower part of the stalk becomes black near the soil line, hence the name black shank. In advanced stages of the disease, the tissues in the center of the lower stalk become blackened, and as the pith dries, it becomes segmented into discs.
1440016 blue mold Peronospora tabacina Blue mold may occur on the plant anytime from seedling to harvest; however, young tissue is more susceptible than old tissue. The first evidence of blue mold in the field usually occurs on the leaves as yellow circular spots about the size of a nickel. The spots soon develop the characteristic bluish, downy fungal growth on the undersides of the leaves which is best seen in the morning when the leaf is wet. If spots develop on leaves that are expanding, a puckering of the leaf occurs. As spots age, they turn from yellow to tan or brown and often tear or drop out. If infection has occurred near or on a leaf vein, a localized systematic infection may occur. The affected vein becomes reddish-brown, and the area around the vein is yellowed and distorted. In newly set transplants, it is possible for the fungus to develop systematically, killing the main bud and resulting in stunting or death of the plant. Splitting the stalk of systematically infected plants reveals a reddish- brown discoloration in the vascular tissue beneath the epidermis. A one-sided systemically infection also occur, resulting in a deformed stalk and lodging of affected plants. During weather favorable for blue mold (cool, cloudy, and wet), the disease can develop rapidly, causing numerous leaf lesions which can result in leaf blighting and severe leaf loss. The disease may develop during hot, humid periods if cool nights exist.
1427113 sudden oak death Phytophthora ramorum
1427101 sudden oak death Phytophthora ramorum
5430091 Pythium diseases Pythium spp. filamentous and terminal sporagia Host: Nicotiana tabacum variety Tennessee 90
5430092 Pythium diseases Pythium spp. filamentous and terminal sporagia Host: Nicotina tabacum variety Tennessee 90
1427094 sudden oak death Phytophthora ramorum Coast live oak dying from P. ramorum infection.
1427093 sudden oak death Phytophthora ramorum P. ramorum symptoms on Rhododendron in central CA. Leaves were confirmed as infected with P. ramorum by Jenny Davidson.
1440054 Phytophthora blight Phytophthora nicotianae Black shank is primarily a disease of the roots and the lower stalk of the tobacco. The symptoms of black shank vary with weather conditions, age of plants, stage of disease development, degree of plant resistance, and virulence of the soil-borne fungal pathogen. Stunting is often the first symptom of black shank, but the disease is seldom recognized until plants wilt. At first, wilted plants will recover in the evening hours, but later become permanently wilted, with leaves turning yellow and hanging down the stalk. During the early stages of disease development, an examination of the plant will show a black discoloration of one or more of the larger roots and the interior of the lower stalk. As the disease progresses, the lower part of the stalk becomes black near the soil line, hence the name black shank. In advanced stages of the disease, the tissues in the center of the lower stalk become blackened, and as the pith dries, it becomes segmented into discs.
1427069 sudden oak death Phytophthora ramorum Signs of bleeding caused by P. ramorum infection on lichen-covered bark of coast live oak.
1236120 Phytophthora root rot Phytophthora cinnamomi
1234125 Phytophthora blight Phytophthora nicotianae
1402021 blue mold Peronospora tabacina Systemic infection begins in leaf veins which turn reddish. Systemically infected stalks are stunted. The leaves are mottled and distorted. When a leaf is removed, discolored vascular tissue is present where the leaf was attached. Often, this discoloration extends down the stalk. The terminal bud may die, and the central portion of the stalk in the terminal bud region will be darkened or deeply discolored. Excessive numbers of ground suckers may develop.
1402039 Phytophthora blight Phytophthora nicotianae Plants cut longitudinally reveal brown to black discoloration of the pith, which is often separated into discs. Discing may not occur in resistant varieties and only a small portion of the pith may be discolored.
1149209 Phytophthora blight Phytophthora nicotianae 1976
1427018 sudden oak death Phytophthora ramorum Big Sur, California
1442067 Phytophthora root rot Phytophthora cinnamomi Healthy (left) diseased (right)
1402020 blue mold Peronospora tabacina Systemic infection begins in leaf veins which turn reddish. Systemically infected stalks are stunted. The leaves are mottled and distorted. When a leaf is removed, discolored vascular tissue is present where the leaf was attached. Often, this discoloration extends down the stalk. The terminal bud may die, and the central portion of the stalk in the terminal bud region will be darkened or deeply discolored. Excessive numbers of ground suckers may develop.
0027047 Phytophthora blight Phytophthora nicotianae
1427070 sudden oak death Phytophthora ramorum Residual signs of bleeding caused by P. ramorum infection on bark surface lichens.
1427092 sudden oak death Phytophthora ramorum P. ramorum leaf symptoms on California laurel (bay).
0027065 blue mold Peronospora tabacina
1427017 sudden oak death Phytophthora ramorum Big Sur, California
1371012 Phytophthora root and crown rot Phytophthora cambivora Story, Germany
1402018 blue mold Peronospora tabacina Blue mold can occur in the plant bed or field. Circular yellow spots up to one inch in diameter develop on the leaves. Blue-gray fungal growth is produced on the underside of these spots when the fungus is active. Spots become light brown when the leaf tissue dies. The disease first develops on lower leaves, but it rapidly spreads to upper leaves during wet, cool weather.
1427005 sudden oak death Phytophthora ramorum
1436044 blue mold Peronospora tabacina on upper leaf surface of seedling
0027048 Phytophthora blight Phytophthora nicotianae
1436045 blue mold Peronospora tabacina on lower leaf surface of seedling
1427002 sudden oak death Phytophthora ramorum
1436122 downy mildew Pseudoperonospora cubensis upper leaf surface
1427103 sudden oak death Phytophthora ramorum Tip droop symptom of sudden oak death on tanoak.
1427086 sudden oak death Phytophthora ramorum Coast live oak dying from P. ramorum infection.
1427064 sudden oak death Phytophthora ramorum Coast live oak dying from P. ramorum infection.
5435605 leaf blight of taro Phytophthora colocasiae
5435612 white rust Albugo ipomoeae-aquaticae
5435613 white rust Albugo ipomoeae-aquaticae
5435618 late blight Phytophthora infestans symptomatic stem
5435619 late blight Phytophthora infestans infested fruits
1427074 sudden oak death Phytophthora ramorum Big Sur, California
5435588 downy mildew Peronospora spp.
5435589 downy mildew Peronospora spp.
5435590 downy mildew Peronospora spp.
1427090 sudden oak death Phytophthora ramorum Tanoak dying from P. ramorum infection, Muir Woods State Park, CA.
1427045 sudden oak death Phytophthora ramorum Tip dieback symptoms caused by P. ramorum on tanoak.
1427075 sudden oak death Phytophthora ramorum Tip blight symptoms on tanoak caused by P. ramorum.
1427099 sudden oak death Phytophthora ramorum Tip blight symptoms of sudden oak death on tanoak.
1236178 Phytophthora root rot Phytophthora cinnamomi
1234127 Phytophthora blight Phytophthora nicotianae
1436163 Pythium diseases Pythium spp.
0027052 Pythium diseases Pythium spp.
1235008 Phytophthora blight Phytophthora nicotianae
0027066 Phytophthora blight Phytophthora nicotianae
1233179 blue mold Peronospora tabacina in plant bed
1234126 Phytophthora blight Phytophthora nicotianae
1234166 downy mildew Pseudoperonospora cubensis upper leaf surface
1440052 Phytophthora blight Phytophthora nicotianae Black shank is primarily a disease of the roots and the lower stalk of the tobacco. The symptoms of black shank vary with weather conditions, age of plants, stage of disease development, degree of plant resistance, and virulence of the soil-borne fungal pathogen. Stunting is often the first symptom of black shank, but the disease is seldom recognized until plants wilt. At first, wilted plants will recover in the evening hours, but later become permanently wilted, with leaves turning yellow and hanging down the stalk. During the early stages of disease development, an examination of the plant will show a black discoloration of one or more of the larger roots and the interior of the lower stalk. As the disease progresses, the lower part of the stalk becomes black near the soil line, hence the name black shank. In advanced stages of the disease, the tissues in the center of the lower stalk become blackened, and as the pith dries, it becomes segmented into discs.
5424469 Pythium diseases Pythium spp. A float tray showing an area with advanced stunting and yellow of infected plants.
5424470 Pythium diseases Pythium spp. Pythium infected roots seen coming out the bottom of the float tray on the right, healthy roots on the left.
5424456 blue mold Peronospora tabacina Infected plants showing yellow spots on lower leaves.
5424457 blue mold Peronospora tabacina Close-up of infected spots which start out yellow then become necrotic with age.
5424461 Phytophthora blight Phytophthora nicotianae Characteristic disking of pith tissue of the lower stem (shank) of an infected tobacco plant.
5430477 Phytophthora root rot Phytophthora cactorum Close-up of bleeding canker on a beech trunk.
5424454 blue mold Peronospora tabacina Underside of an infected leaf with spots showing a darker border.
5424455 blue mold Peronospora tabacina Close-up of infected spots which start out yellow then become necrotic with age.
5424458 blue mold Peronospora tabacina Plant stem cut near the soil line revealing infected, darkened vascular tissue.
5424459 blue mold Peronospora tabacina Plants with stem cut in cross section showing infected, darkened vascular tissue as a ring.
5424460 blue mold Peronospora tabacina Plant with stem cut both in cross section and tangentially to reveal infected, darkened vascular tissue.
5424462 Phytophthora blight Phytophthora nicotianae Characteristic disking of pith tissue of the lower stem (shank) of an infected tobacco plant.
1440008 blue mold Peronospora tabacina Blue mold can be very devastating to tobacco plants in the bed. Usually, the first symptom of blue mold in the bed is yellowed areas of diseased plants. The leaves of affected plants in these yellowed areas will have a cupped appearance, and the undersides of the leaves will show tell-tale, blue-gray downy fungal growth. Older plants can be deformed and twisted, and the main growing point eventually is killed. Veins in affected areas of twisted leaves are reddish-brown and can become necrotic. On older plants, definite yellow spots with bluish fungal growth on the underside of leaves can occur.
1402006 Pythium diseases Pythium spp. Under severe situations, the plant bed may be bare. Newly transplanted tobacco is vulnerable to damping-off during cool, wet weather. Pythium lesions are large and wet. They extend up the plant tissue or encompass the entire stem.
1436051 Phytophthora blight Phytophthora nicotianae on outside of stem.
1436052 Phytophthora blight Phytophthora nicotianae on inside of stem.
1235010 Phytophthora blight Phytophthora nicotianae
1427039 sudden oak death Phytophthora ramorum
1235131 pod rot Pythium myriotylum
1440018 blue mold Peronospora tabacina Blue mold may occur on the plant anytime from seedling to harvest; however, young tissue is more susceptible than old tissue. The first evidence of blue mold in the field usually occurs on the leaves as yellow circular spots about the size of a nickel. The spots soon develop the characteristic bluish, downy fungal growth on the undersides of the leaves which is best seen in the morning when the leaf is wet. If spots develop on leaves that are expanding, a puckering of the leaf occurs. As spots age, they turn from yellow to tan or brown and often tear or drop out. If infection has occurred near or on a leaf vein, a localized systematic infection may occur. The affected vein becomes reddish-brown, and the area around the vein is yellowed and distorted. In newly set transplants, it is possible for the fungus to develop systematically, killing the main bud and resulting in stunting or death of the plant. Splitting the stalk of systematically infected plants reveals a reddish- brown discoloration in the vascular tissue beneath the epidermis. A one-sided systemically infection also occur, resulting in a deformed stalk and lodging of affected plants. During weather favorable for blue mold (cool, cloudy, and wet), the disease can develop rapidly, causing numerous leaf lesions which can result in leaf blighting and severe leaf loss. The disease may develop during hot, humid periods if cool nights exist.
5429793 downy mildew Peronospora spp. sporulation from underside of rose leaf after 12 hours in a moist chamber
1235013 Phytophthora blight Phytophthora nicotianae
5035095 sudden oak death Phytophthora ramorum Tanoak dying from Phytophthora ramorum infection
0027046 Phytophthora blight Phytophthora nicotianae
1570865 downy mildew Peronospora destructor March 1995
1571061 downy mildew Peronospora destructor Light colored patch in field (upper center of frame) is downy mildew. March 1995
1571062 downy mildew Peronospora destructor Chlorotic patches in field are caused by downy mildew. March 1995
1571063 downy mildew Peronospora destructor Chlorosis is caused by downy mildew. March 1995
1571065 downy mildew Peronospora destructor Chlorotic patches in field are caused by downy mildew. March 1995
1571066 downy mildew Peronospora destructor Chlorotic patches in field are caused by downy mildew. March 1995
1571067 downy mildew Peronospora destructor Chlorotic patches in field are caused by downy mildew. March 1995
1571068 downy mildew Peronospora destructor Yellowing of plants is caused by downy mildew. March 1995
1571069 downy mildew Peronospora destructor Chlorotic patches on leaves are caused by downy mildew. March 1995
1571159 downy mildew Peronospora destructor Large patches of discolored plant tissue are the result of downy mildew. April 1995
1571160 downy mildew Peronospora destructor Large patches of discolored plant tissue are the result of downy mildew. April 1995
1571161 downy mildew Peronospora destructor Large patches of discolored plant tissue are the result of downy mildew. April 1995
1571165 downy mildew Peronospora destructor Large patches of discolored plant tissue are the result of downy mildew. Darker green areas in the upper left of frame are not as affected. April 1995
0454033 Red stele root rot of strawberry Phytophthora fragariae fragariae Strawberry plants infected by Phytophthora fragariae var. fragariae, showing poor growth and wilting.
1235011 Phytophthora blight Phytophthora nicotianae
1149207 Phytophthora blight Phytophthora nicotianae 1976
5377183 downy mildew Pseudoperonospora cubensis Downy mildew on watermelon. Note that lesions are irregularly shaped and that some have a tan margin with black flecks.  Symptoms of downy mildew on watermelon are quite different from symptoms on other cucurbits.
1149206 Phytophthora blight Phytophthora nicotianae 1976
1436139 Phytophthora root rot Phytophthora cinnamomi
0027050 Phytophthora blight Phytophthora nicotianae
2651048 Phytophthora root rot Phytophthora cinnamomi dead seedling.
2651046 Phytophthora root rot Phytophthora cinnamomi root decay (bark removed) at base of stem.
1402037 Phytophthora blight Phytophthora nicotianae The black shank fungus can infect tobacco plants of any age. In young seedlings, stems may decay near the soil surface and the root system may become partly or completely black. A dark lesion may extend up the stem. Symptoms are sometimes confused with damping-off caused by other organisms. The photo above shows black shank damage as it appears in the field. Leaves may suddenly and uniformly wilt or droop, turn yellow, and hang down the stalk. Warm, moist weather conditions favor black shank development. Advanced stages of this disease may cause partial or complete decay of the root system. The black shank fungus is soil-borne and is readily translocated by equipment or water movement to noninfested areas. Since the spores of the fungus are so mobile, distribution of the disease within a field may not be uniform.
4822080 Phytophthora basal canker Phytophthora palmivora Distinctive coffee-brown or dark rusty reddish-brown to black discoloration of bark.
5402937 late blight Phytophthora infestans
5402938 late blight Phytophthora infestans 1950
1402038 Phytophthora blight Phytophthora nicotianae Stalks generally develop black lesions which may extend several inches above the ground
4822079 Phytophthora basal canker Phytophthora palmivora zone line between infected vs. uninfected bark
1427072 sudden oak death Phytophthora ramorum Coast live oak infected with P. ramorum.
1440004 Pythium diseases Pythium spp. Damping-off affects tobacco at any stage of growth in the plant bed. The disease first appears as irregular areas of wilted, yellowed, stunted, or dead plants. These symptoms are the result of girdling of the lower stem of the tobacco plants by either Rhizoctonia or Pythium fungi species.Pythium usually affects the young tobacco plant near the soil line. A soft, brown, watery rot girdles the stem, causing the plants to fall over. Plants affected after stems harden may not die but turn yellow due to injury to the stem and root system. Pythium sometimes attacks transplants shortly after they are set in the field, causing a stem rot.
1236179 Phytophthora root rot Phytophthora cinnamomi
1427105 sudden oak death Phytophthora ramorum Symptom progression on coast live oaks, from wilting to dead.
1236121 Phytophthora root rot Phytophthora cinnamomi
1402005 Pythium diseases Pythium spp. Soil-borne fungi are the main cause of damping-off. Symptoms first appear on the stem of seedlings as a brown to black rot. The decay extends up the stem and causes the seedlings to collapse. Roots of affected plants may remain healthy. Seedlings die in patches.
2250069 Pythium diseases Pythium spp. in nursery of grand fir
0454034 red stele Phytophthora fragariae Healthy control strawberry plants (not affected by Phytophthora fragariae).
1233180 blue mold Peronospora tabacina in plant bed
1440019 blue mold Peronospora tabacina Blue mold may occur on the plant anytime from seedling to harvest; however, young tissue is more susceptible than old tissue. The first evidence of blue mold in the field usually occurs on the leaves as yellow circular spots about the size of a nickel. The spots soon develop the characteristic bluish, downy fungal growth on the undersides of the leaves which is best seen in the morning when the leaf is wet. If spots develop on leaves that are expanding, a puckering of the leaf occurs. As spots age, they turn from yellow to tan or brown and often tear or drop out. If infection has occurred near or on a leaf vein, a localized systematic infection may occur. The affected vein becomes reddish-brown, and the area around the vein is yellowed and distorted. In newly set transplants, it is possible for the fungus to develop systematically, killing the main bud and resulting in stunting or death of the plant. Splitting the stalk of systematically infected plants reveals a reddish- brown discoloration in the vascular tissue beneath the epidermis. A one-sided systemically infection also occur, resulting in a deformed stalk and lodging of affected plants. During weather favorable for blue mold (cool, cloudy, and wet), the disease can develop rapidly, causing numerous leaf lesions which can result in leaf blighting and severe leaf loss. The disease may develop during hot, humid periods if cool nights exist.
1442068 Phytophthora root rot Phytophthora cinnamomi stand break up due to disease
1277108 Phytophthora disease of alders Phytophthora alni
1235232 Phytophthora root rot Phytophthora cinnamomi
1427006 sudden oak death Phytophthora ramorum
5426941 downy mildew Peronospora destructor Downy mildew leaions on Allium leaves
5426933 downy mildew Peronospora chlorae Mass of sporangia on leaves and cause leaf curl
2110004 Phytophthora disease of alders Phytophthora alni Smooth-walled oogonium of P. alni (Swedish variant) with oospore and amphigynous antheridium.
2110005 Phytophthora disease of alders Phytophthora alni Mature, riparian common alder (A. glutinosa) stand heavily impacted by root and collar rot caused by P. alni; surviving healthy alder in the center may indicate occurrence of resistance.
2110006 Phytophthora disease of alders Phytophthora alni Mature, riparian common alder (A. glutinosa) stand with high impact of Phytophthora root and collar rot.
2110007 Phytophthora disease of alders Phytophthora alni Alder plantation on former agricultural land; note infected grey alder (A. incana) with sparse, chlorotic and small-sized foliage.
2110012 Phytophthora disease of alders Phytophthora alni Root system of a 2-year-old nursery grown common alder (A. glutinosa) with necrotic lesions caused by P. alni.
2110009 Phytophthora disease of alders Phytophthora alni Common alder (A. glutinosa) in a non-flooded forest plantation with root and collar rot caused by P. alni.
2110010 Phytophthora disease of alders Phytophthora alni Mature common alder (A. glutinosa) with collar rot by P. alni (note tarry spots at the outer bark) growing in a forest stand; introduction of the pathogen via alder plantation in the neighbourhood established with infested planting stock.
2110011 Phytophthora disease of alders Phytophthora alni 2-yr-old sprouts of of an 8-yr-old coppiced Alnus glutinosa showing wilting due to root and collar rot caused by P. alni.
5407861 downy mildew Plasmopara viticola Downy fungal growth on the underside of grape leaves infected with Plasmopara viticoloa
5407877 red stele Phytophthora fragariae Strawberry roots showing the reddish brown stele associated with Phytophthora fragariae (red stele disease)
0364056 Phytophthora root rot Phytophthora cinnamomi symptoms on shortleaf pine
1235007 Phytophthora blight Phytophthora nicotianae
2110008 Phytophthora disease of alders Phytophthora alni Grey alder (A. incana) with collar rot caused by P. alni; note the typical tarry spots at the outer bark and the tongue-shaped orange-brown necrosis of the inner bark.
2110002 Phytophthora disease of alders Phytophthora alni Non-papillate sporangia of P. alni showing nested proliferation.
2110003 Phytophthora disease of alders Phytophthora alni Bullate oogonium of P. alni (German variant) with oospore and amphigynous antheridium.
2110001 Phytophthora disease of alders Phytophthora alni Mature common alder with collar rot caused by P. alni showing sparse, chlorotic and small-sized foliage.
0027063 blue mold Peronospora tabacina
5407860 downy mildew Plasmopara viticola Foliar spotting on grape leaf due to downy mildew
5426947 downy mildew Plasmopara viticola Sporangia of downy mildew on the lower surface of grape
5426939 late blight Phytophthora infestans Darkened stem near tomato fruit
5426940 late blight Phytophthora infestans Field view of late blight damages
5426938 late blight Phytophthora infestans Mycelia produced on tomato fruit
1371015 Phytophthora root and crown rot Phytophthora cambivora Uniform yellowing of young tree due to root damage. Story, Germany
1371013 Phytophthora root and crown rot Phytophthora cambivora Tar spots. Lesse, Germany
5021074 Phytophthora root rot Phytophthora cactorum dieback
5035093 sudden oak death Phytophthora ramorum Tanoak killed by Phytophthora ramorum in Muir Woods
5035094 sudden oak death Phytophthora ramorum Tanoak dying from Phytophthora ramorum infection
5041040 sudden oak death Phytophthora ramorum Symptoms on coast live oak
5041042 sudden oak death Phytophthora ramorum Symptoms on coast live oak
5058096 sudden oak death Phytophthora ramorum Symptoms on Pacific madrone
5046052 sudden oak death Phytophthora ramorum Dark discoloration of inner bark
5046056 sudden oak death Phytophthora ramorum Crown symptoms
5046063 sudden oak death Phytophthora ramorum Twig dieback
5046068 sudden oak death Phytophthora ramorum Twig symptoms
5046055 sudden oak death Phytophthora ramorum Leaf symptoms
1571075 downy mildew Peronospora destructor Chlorotic patches on leaves are caused by downy mildew. March 1995
1571076 downy mildew Peronospora destructor The downy mildew pathogen (Peronospora destructor) produces a downy growth on the leaf surface. March 1995
1571077 downy mildew Peronospora destructor The downy mildew pathogen (Peronospora destructor) produces a downy growth on the leaf surface (center frame; left edge of leaf) which eventually kills the leaf. March 1995
1571018 downy mildew Bremia lactucae Lettuce downy mildew cause by Bremia lactucae. March 1995
1571019 downy mildew Bremia lactucae Lettuce downy mildew cause by Bremia lactucae. March 1995
1571020 downy mildew Bremia lactucae Lettuce downy mildew cause by Bremia lactucae. March 1995
1571021 downy mildew Bremia lactucae Lettuce downy mildew cause by Bremia lactucae. March 1995
1571022 downy mildew Bremia lactucae Lettuce downy mildew cause by Bremia lactucae. March 1995
1571024 downy mildew Bremia lactucae Lettuce downy mildew cause by Bremia lactucae. March 1995
1571026 downy mildew Bremia lactucae Lettuce downy mildew cause by Bremia lactucae. March 1995
1571027 downy mildew Bremia lactucae Lettuce downy mildew cause by Bremia lactucae. March 1995
1571028 downy mildew Bremia lactucae Lettuce downy mildew cause by Bremia lactucae. March 1995
5045047 sudden oak death Phytophthora ramorum Severe impact of Phytophthora ramorum on Pacific madrone
1570306 downy mildew Peronospora farinosa Mass of sporangia and sporangiophores of Peronospora effusa (100X, phase contrast). December 1991
5411472 downy mildew Pseudoperonospora cubensis Cucumber leaves showing various stages of downy mildew lesion development.
5411474 downy mildew Pseudoperonospora cubensis Necrosis and upward curling of leaf margins associated with downy mildew.
5411473 downy mildew Pseudoperonospora cubensis Chlorotic spotting of foliage during early stages of downy mildew development.
5411477 Phytophthora blight Phytophthora capsici Phytophthora blight on field-grown bell peppers.
5411483 Phytophthora blight Phytophthora capsici Phytophthora blight on lower stem of bell pepper.
5411484 Phytophthora blight Phytophthora capsici Aerial blight phase of Phytophthora blight on bell pepper.
5411485 Phytophthora blight Phytophthora capsici Sporulation of Phytophthora capsici on stems and fruit of bell pepper.
1570477 Phytophthora basal canker Phytophthora palmivora Brown rot caused by Phytophthora palmivora. May 1992
5280073 downy mildew Pseudoperonospora cubensis
5407883 Phytophthora root and crown rots Phytophthora spp.
5405299 downy mildew Plasmopara cercidis Angular tan to brown blocks of infected tissue mostly along the veins on the upper leaf surface caused by the fungus Plasmopara cercidis.  The eight or more larger brown spots that are less angular and surrounded by a yellow halo are infections of Pseudocercospora vitis the cause of Pseudocercospora leaf blight. 
5405300 downy mildew Plasmopara cercidis Angular white to brown blocks of infected tissue mostly along the veins on the lower leaf surface caused by the fungus Plasmopara cercidis.  The eight or more larger brown spots that are less angular and surrounded by a yellow halo are infections of Pseudocercospora vitis the cause of Pseudocercospora leaf blight.
5405301 downy mildew Plasmopara cercidis Close-up of the lower surface of a leaf with angular areas of older and younger infections caused by the fungus Plasmopara cercidis.  White sporangiaphores and sporangia can be seen coming from the younger infected tissue.
5405302 downy mildew Plasmopara cercidis Close-up of the lower surface of a leaf with angular areas of younger infections caused by the fungus Plasmopara cercidis.  White sporangiaphores and sporangia can be seen coming from the younger infected tissue.
5405303 downy mildew Plasmopara cercidis Close-up of one angular area of younger infection caused by the fungus Plasmopara cercidis.  White sporangiaphores and sporangia can be seen coming from the infected tissue.
5405304 downy mildew Plasmopara cercidis Characteristic sporangiaphores and sporangia of the fungus Plasmopara cercidis.
5405305 downy mildew Plasmopara cercidis Characteristic sporangiaphores and sporangia of the fungus Plasmopara cercidis.
5408716 Phytophthora root and crown rots Phytophthora spp. Image shows samples of field soil (25 cm2) from Fraser fir production sites, flooded with 40 ml of distilled water. Rhododendron leaf disks were floated on the water surface as a bait for zoospores of Phytophthora spp.  Leaf disks are typically removed after 24 hours and plated on selective medium for detection of Phytophthora.
5408717 Phytophthora root rot Phytophthora cinnamomi Phytophthora cinnamomi growing from Fraser fir root samples on PARPH-V8 agar, approximately 48 hours after plating.
5408718 Phytophthora root rot Phytophthora cinnamomi Phytophthora cinnamomi growing from Fraser fir root samples on PARPH-V8 agar, approximately 48 hours after plating.
5039013 Phytophthora root and crown rots Phytophthora spp. Leaf symptoms caused by Phytophthora sp. on Rhododendron.
5253012 Phytophthora root rot Phytophthora cinnamomi Bleeding canker caused by Phytophthora cinnamomi, Arrayanal, Mexico
5253013 Phytophthora root rot Phytophthora cinnamomi Bleeding canker caused by Phytophthora cinnamomi, Arrayanal, Mexico
5253014 Phytophthora root rot Phytophthora cinnamomi Bleeding canker caused by Phytophthora cinnamomi, Arrayanal, Mexico
5253015 Phytophthora root rot Phytophthora cinnamomi Bleeding canker caused by Phytophthora cinnamomi, Arrayanal, Mexico
5253016 Phytophthora root rot Phytophthora cinnamomi Zone lines around canker cause by Phytophthora cinnamomi
5253099 Phytophthora root and crown rots Phytophthora spp. Bleeding canker on oak
5035035 sudden oak death Phytophthora ramorum Leaf symptoms of ramorum leaf blight on California bay laurel
5035036 sudden oak death Phytophthora ramorum Phytophthora ramorum leaf symptoms on California bay laurel
5035039 sudden oak death Phytophthora ramorum Mortality in tanoak caused by Phytophthora ramorum
1534005 Pythium root and stem rot Pythium aphanidermatum
1534004 Pythium root and stem rot Pythium aphanidermatum cottony leak
1534003 Pythium root and stem rot Pythium aphanidermatum cottony leak
1534001 downy mildew Pseudoperonospora cubensis
5402928 late blight Phytophthora infestans
1571043 late blight Phytophthora infestans
1571044 late blight Phytophthora infestans
1571045 late blight Phytophthora infestans
1571046 late blight Phytophthora infestans Leaf underside
1571047 late blight Phytophthora infestans
1571048 late blight Phytophthora infestans
1571049 late blight Phytophthora infestans
1571050 late blight Phytophthora infestans
1571051 late blight Phytophthora infestans
1571052 late blight Phytophthora infestans
5402925 late blight Phytophthora infestans on leaflets
5402926 late blight Phytophthora infestans leaf lesions
5078063 blue mold Peronospora tabacina Blue mold of tobacco, lower leaf surface.
5402927 late blight Phytophthora infestans
5044023 sudden oak death Phytophthora ramorum Tanoak sprouts killed by Phytophthora ramorum.
5038043 sudden oak death Phytophthora ramorum Symptoms of P. ramorum on Douglas-fir
5044026 sudden oak death Phytophthora ramorum Coast live oak killed by P. ramorum.
5044027 sudden oak death Phytophthora ramorum Tan oak killed by P. ramorum.
5044028 sudden oak death Phytophthora ramorum young tanoak killed by P. ramorum.
5044029 sudden oak death Phytophthora ramorum Tanoak killed by P. ramorum.
5044030 sudden oak death Phytophthora ramorum Tanoak sprouts killed by P. ramorum.
5202007 sudden oak death Phytophthora ramorum
5202008 sudden oak death Phytophthora ramorum
5202009 sudden oak death Phytophthora ramorum
5202003 sudden oak death Phytophthora ramorum
5202004 sudden oak death Phytophthora ramorum inoculating leaf with agar cube containing the pathogen
5202005 sudden oak death Phytophthora ramorum agar cubes with the pathogen used to innoculate leaves
5202006 sudden oak death Phytophthora ramorum
5201099 sudden oak death Phytophthora ramorum
5201100 sudden oak death Phytophthora ramorum
5202001 sudden oak death Phytophthora ramorum
5202002 sudden oak death Phytophthora ramorum
1563084 Phytophthora blight Phytophthora capsici Abundant sporulation occurs on the surface growth.  Phtophthora Fruit Rot
5395237 Pythium diseases Pythium spp. Root rot due to Pythium and Rhizoctonia, 2009
5395238 Pythium diseases Pythium spp. Root rot due to Pythium and Rhizoctonia
1563085 Phytophthora blight Phytophthora capsici
1563081 Pythium diseases Pythium spp. Pythium Cottony Leak or Pythium Fruit Rot can be common during hot/wet weather in North Carolina. 
1563082 Pythium diseases Pythium spp. In a moist chamber Pythium spp will form extensive, cottony, mycelial growth. 
1563083 Pythium diseases Pythium spp. Pythium Cottony Leak or Pythium Fruit Rot can be common during hot/wet weather in North Carolina.  Initially the fruit lesions are brownish, water soaked, and soft.  Often infection starts on tissue in contact with soil. 
2179036 sudden oak death Phytophthora ramorum
2179038 sudden oak death Phytophthora ramorum
2171066 downy mildew Peronospora farinosa f.sp. betae
2171067 downy mildew Peronospora farinosa f.sp. betae
2171068 downy mildew Peronospora farinosa f.sp. betae
2171069 downy mildew Peronospora farinosa f.sp. betae
5393422 white rust Albugo portulacae Sporangia produced on leaf surface
5393418 late blight Phytophthora infestans Brownish on leaf and stem, with hyphae and sporangia produced at the edge of spot on leaf
5393413 downy mildew Hyaloperonospora brassicae Symptom on the leaf surface
5393414 downy mildew Hyaloperonospora brassicae
5393182 downy mildew Hyaloperonospora brassicae
5393180 downy mildew Pseudoperonospora cubensis
5043049 sudden oak death Phytophthora ramorum Sudden oak death field trip
5297081 sudden oak death Phytophthora ramorum Bark cracks with black ooze in coast live oak, a symptom of ramorum canker.
5251049 sudden oak death Phytophthora ramorum Bark discoloration and zone lines in coast live oak.
5037093 sudden oak death Phytophthora ramorum Symptoms of ramorum leaf blight on California bay laurel.
1563047 downy mildew Pseudoperonospora cubensis Photomicrograph at 30x of downy mildew leafspot on abaxial surface.  The dark colored sporangia can be seen on the sporangiophores.
1563048 downy mildew Pseudoperonospora cubensis Photomicrograph at 30x of downy mildew leafspot on abaxial surface.  The dark colored sporangia can be seen on the sporangiophores.  Notice size of leaf hairs.
5043084 sudden oak death Phytophthora ramorum site of extensive ramorum canker on oak.
5043085 sudden oak death Phytophthora ramorum Sudden oak death (ramorum canker) symptoms on coast live oak
5043086 sudden oak death Phytophthora ramorum Sudden oak death (ramorum canker) symptoms on coast live oak
5043087 sudden oak death Phytophthora ramorum Sudden oak death (ramorum canker) symptoms on coast live oak
5043090 sudden oak death Phytophthora ramorum Sudden oak death symptoms on coast live oak in California.
5043093 sudden oak death Phytophthora ramorum Sudden oak death (ramorum canker) symptoms on coast live oak
5043094 sudden oak death Phytophthora ramorum Sudden oak death (ramorum canker) symptoms on coast live oak
5038022 sudden oak death Phytophthora ramorum Sudden oak death (ramorum canker) symptoms on coast live oak
5038023 sudden oak death Phytophthora ramorum Sudden oak death (ramorum canker) symptoms on coast live oak
1563024 downy mildew Pseudoperonospora cubensis Notice that young leaves have no lesions, older leaves have many lesions, and lower leaves are dead.  Individual leaf spots have a slight orange/yellow hue and are often angular.
1563025 downy mildew Pseudoperonospora cubensis Large cucumber field in eastern North Carolina with much downy mildew.
1563026 downy mildew Pseudoperonospora cubensis Notice orange/yellow hue of leafspots
1563027 downy mildew Pseudoperonospora cubensis Notice that older leaves show most leaf spots.  Lower leaves are dead.  Individual leaf spots have a slight orange/yellow hue and are often angular.
1563028 downy mildew Pseudoperonospora cubensis Cucumber field defoliated. 
1563029 downy mildew Pseudoperonospora cubensis Notice that older leaves show most leaf spots.  Lower leaves are dead.  Individual leaf spots have a slight orange/yellow hue and are often angular.
1563030 downy mildew Pseudoperonospora cubensis Young cucumber plants with downy mildew.  Notice that individual leaf spots have a slight orange/yellow hue and are often angular.
1563031 downy mildew Pseudoperonospora cubensis Notice that older leaves show most leaf spots.  Lower leaves are dead.  Individual leaf spots have a slight orange/yellow hue and are often angular.
1563033 downy mildew Pseudoperonospora cubensis Notice that older leaves show most leaf spots.  Lower leaves are dead.  Individual leaf spots have a slight orange/yellow hue and are often angular.
1563034 downy mildew Pseudoperonospora cubensis Downy mildew does not overwinter in North Carolina, and the spores arrive each year at different times in the summer from areas to the south.  The disease is favored by wet and hot weather. 
1563035 downy mildew Pseudoperonospora cubensis Downy mildew leaf spots are initially yellow/orange and then become necrotic with the entire leaf eventually dying. 
1563042 downy mildew Pseudoperonospora cubensis Early symptoms on young leaf
1563043 downy mildew Pseudoperonospora cubensis Photomicrograph (200x) showing sporangia, typical branching of sporangiophores, and leaf hairs. 
1563044 downy mildew Pseudoperonospora cubensis Downy mildew.  Leaf spots are angular, yellow/orange. 
1563045 downy mildew Pseudoperonospora cubensis Downy mildew.  Leaf spots are angular, yellow/orange. 
1563046 downy mildew Pseudoperonospora cubensis Close up of downy mildew.  Leaf spots are angular, yellow/orange. 
5389662 Pythium diseases Pythium spp. Pythium oospore in root tissue of poinsettia
5389663 Pythium diseases Pythium spp. Pythium oospore in root tissue of poinsettia
5385817 white rust Albugo occidentalis Close-up of raised, white pustules on the lower leaf surface of an infected leaf
5389800 downy mildew Peronospora hariotii Angular leaf spots
5390503 Pythium diseases Pythium spp. Rice fine roots rotted by various fungal pathogens
5390529 Pythium diseases Pythium spp. Rice roots showing symptoms of rot by several fungal pathogens
5390563 water mold Achlya spp. Rice seed infected with water mold showing pathogen hyphae radiating out into water
5390564 water mold Achlya spp. Mycelium and wet areas around rice seeds infected with water molds
5390562 Pythium diseases Pythium spp. Mycelium causing wet areas around rice seeds infected with water molds
5110058 Phytophthora kernoviae Phytophthora kernoviae Organism grown on P5ARP[H] medium (Jeffers SN and Martin SB (1986) Comparison of two media selective for Phytophthora and Pythium sp. Plant disease 70, 1038-1043). Note earlier spelling of organism prior to publication of official name.
5334074 Phytophthora root and crown rots Phytophthora spp. Baiting for Phytophthora
5389801 downy mildew Peronospora hariotii Angular leaf spots
5389815 downy mildew Peronospora manshurica Leaf spots on upper leaf surface
5389816 downy mildew Peronospora manshurica Leaf spots on lower leaf surface
5390070 leaf blight of taro Phytophthora colocasiae Sporangiospores
5390071 leaf blight of taro Phytophthora colocasiae germinating zoospores
5390072 leaf blight of taro Phytophthora colocasiae zoospore release
5390077 Phytophthora basal canker Phytophthora palmivora sporangiospores: sympodial branching
5390078 Phytophthora basal canker Phytophthora palmivora sporangiospores, chlamydospores; Cotton Blue (stain)
5379795 Phytophthora root rot Phytophthora alni ssp. multiformis
5379796 Phytophthora root rot Phytophthora alni ssp. multiformis
5379797 Phytophthora root rot Phytophthora alni ssp. multiformis
5382598 Phytophthora disease of alders Phytophthora alni
5382599 Phytophthora disease of alders Phytophthora alni
5382601 Phytophthora disease of alders Phytophthora alni
5382602 Phytophthora disease of alders Phytophthora alni
5368868 Phytophthora blight Phytophthora nicotianae Characteristic disking of pith tissue of the lower stem (shank) of an infected tobacco plant. Hybrid 403, a burley variety
5368705 Phytophthora blight Phytophthora nicotianae Asexual spore-producing bodies called "sporangia" of the fungus Phytophthora parasitica var. nicotianae. When the sporangia is hollow-looking it has produced zoospores and they swam away in search of susceptible host tissue.
5368865 Phytophthora blight Phytophthora nicotianae Plants with Black shank wilt, turn yellow, and eventually die. Hybrid 403, a burley variety
5368866 Phytophthora blight Phytophthora nicotianae Plants with Black shank wilt, turn yellow, and eventally die. Hybrid 403, a burley variety
5368867 Phytophthora blight Phytophthora nicotianae Plants with Black shank wilt, turn yellow, and eventually die. Hybrid 403, a burley variety
5382600 Phytophthora disease of alders Phytophthora alni bark necrosis
5368994 downy mildew Peronospora manshurica brown spots caused by infection of Peronospora manshurica
5385791 Phytophthora root rot Phytophthora cactorum Blighting of new growth and/or flower buds
5385792 Phytophthora root rot Phytophthora cactorum Blighting of new growth and/or flower buds
5385793 Phytophthora root rot Phytophthora cactorum Blighting of new growth and/or flower buds
5385794 Phytophthora root rot Phytophthora cactorum Blighting of new growth and/or flower buds
5385795 Phytophthora root rot Phytophthora cactorum Blighting of new growth and/or flower buds
5385796 Phytophthora root rot Phytophthora cactorum Pieces of blighted tissue incubated in water and viewed under the microscope
5385797 Phytophthora root rot Phytophthora cactorum Sporangia, asexual spore-producing bodies of the fungus
5385798 Phytophthora root rot Phytophthora cactorum Sporangia, asexual spore-producing bodies of the fungus
5385799 Phytophthora root rot Phytophthora cactorum Sporangia, asexual spore-producing bodies of the fungus
5385800 Phytophthora root rot Phytophthora cactorum Sporangia, asexual spore-producing bodies of the fungus
5385818 white rust Albugo occidentalis Close-up of raised, white pustules on the lower leaf surface of an infected leaf
5385819 white rust Albugo occidentalis Close-up of raised, white pustules on the lower leaf surface of an infected leaf
5385820 white rust Albugo occidentalis Close-up of raised, white pustules on the lower leaf surface of an infected leaf
5385821 white rust Albugo occidentalis Asexual spores of the fungus with a measurement scale
5385813 white rust Albugo occidentalis White pustules of the fungus on the lower surface of infected leaves.
5385814 white rust Albugo occidentalis Yellow areas on the upper surface of infected leaves.
5385815 white rust Albugo occidentalis Yellow areas on the upper surface and raised, white pustules on the lower leaf surface of infected leaves
5385816 white rust Albugo occidentalis Yellow areas on the upper surface and raised, white pustules on the lower leaf surface of infected leaves
5385822 white rust Albugo occidentalis Asexual spores of the fungus with a measurement scale
5385823 white rust Albugo occidentalis Asexual spores of the fungus with a measurement scale
5366529 Phytophthora root and crown rots Phytophthora spp. Phytophthora root & crown rot infection of raspberry caused by Phytophthora spp..
5368293 Phytophthora blight Phytophthora nicotianae Zoospores swimming away from sporangium. From narrowleaf madole variety.
5042070 sudden oak death Phytophthora ramorum Inspection of nursery infected with Phytophthora ramorum on Rhododendron.
1525353 Pythium diseases Pythium spp. Pythium on Impatiens
1525354 Pythium diseases Pythium spp. Pythium on Impatiens
1525358 Pythium diseases Pythium spp. Pythium on Impatiens
1525359 Pythium diseases Pythium spp. Pythium on Impatiens
1525360 Pythium diseases Pythium spp. Pythium on Impatiens
1525361 Pythium diseases Pythium spp. Pythium on Impatiens
1525362 Pythium diseases Pythium spp. Pythium on Impatiens
1525355 Pythium diseases Pythium spp. Pythium on Impatiens
1525510 Phytophthora root rot Phytophthora cactorum
1525530 Phytophthora blight Phytophthora nicotianae
1525531 Phytophthora blight Phytophthora nicotianae
1525532 Phytophthora blight Phytophthora nicotianae
1525551 downy mildew Peronospora arthurii Evening primrose
1525576 Phytophthora blight Phytophthora nicotianae
1525655 Phytophthora blight Phytophthora nicotianae
1525656 Phytophthora blight Phytophthora nicotianae
1525657 Phytophthora blight Phytophthora nicotianae
1525658 Phytophthora blight Phytophthora nicotianae
1525659 Phytophthora blight Phytophthora nicotianae
1525660 Phytophthora blight Phytophthora nicotianae
1525662 Phytophthora blight Phytophthora nicotianae
1525663 Phytophthora blight Phytophthora nicotianae
1525664 Phytophthora blight Phytophthora nicotianae
1525665 Phytophthora blight Phytophthora nicotianae
1525666 Phytophthora blight Phytophthora nicotianae
1525661 Phytophthora blight Phytophthora nicotianae sporangia
5333020 Pythium diseases Pythium spp. Pennsylvania State University field trials
5333021 Pythium diseases Pythium spp.
5333023 Pythium diseases Pythium spp.
5333022 Pythium diseases Pythium spp. Pennsylvania State University field trials
5333024 Pythium diseases Pythium spp.
5336029 Pythium diseases Pythium spp.
5336051 Pythium diseases Pythium spp.
5336073 Pythium diseases Pythium spp.
5336063 Pythium diseases Pythium spp.
5336085 Pythium diseases Pythium spp.
5337026 Phytophthora blight Phytophthora nicotianae
5337039 Phytophthora root and crown rots Phytophthora spp.
5337040 Phytophthora root and crown rots Phytophthora spp.
5337041 Phytophthora root and crown rots Phytophthora spp.
5337066 Phytophthora root and crown rots Phytophthora spp. on rhododendron
5337072 Phytophthora root rot Phytophthora cinnamomi
5337073 Phytophthora root rot Phytophthora cinnamomi
5338006 Phytophthora root rot Phytophthora cinnamomi sporangium
5338005 Phytophthora root rot Phytophthora cinnamomi microscopic view of oogonia and antheridia
5338004 Phytophthora root rot Phytophthora cinnamomi microscopic view of sporangia and mycelium on root
5338008 Phytophthora basal canker Phytophthora palmivora microscopic view of oogonium and antheridium
5338009 Phytophthora basal canker Phytophthora palmivora oospores
5338034 Phytophthora blight Phytophthora nicotianae Nonselective medium vs. selective medium: Trichoderma growing from root pieces on nonselective medium (left) vs. Phytophthora nicotianae growing from root pieces on selective medium containing hymexazole and vancomycin (right)
5337016 downy mildew Peronospora antirrhini
5338001 Phytophthora root rot Phytophthora cactorum microscopic view of sporangium
1525146 Phytophthora root and crown rots Phytophthora spp.
1525147 Phytophthora root and crown rots Phytophthora spp.
1525178 Phytophthora root and crown rots Phytophthora spp. Phytophthora on Coleus
1525179 Phytophthora root and crown rots Phytophthora spp. Phytophthora on coleus
1525191 Pythium diseases Pythium spp.
1525192 Pythium diseases Pythium spp.
1525260 Phytophthora root rot Phytophthora cactorum Phytophthora cactorum on Ginseng
1525295 Phytophthora blight Phytophthora nicotianae
1525293 Phytophthora blight Phytophthora nicotianae
1525294 Phytophthora blight Phytophthora nicotianae
1525296 Phytophthora blight Phytophthora nicotianae
1525297 Phytophthora blight Phytophthora nicotianae
1525298 Phytophthora blight Phytophthora nicotianae
1525299 Phytophthora blight Phytophthora nicotianae
5358848 Pythium root and stem rot Pythium coloratum Oospore within an oogonium of Pythium coloratum
5368291 Phytophthora blight Phytophthora nicotianae Sporangium ready to release its zoospores. From narrowleaf madole variety.
5368292 Phytophthora blight Phytophthora nicotianae Zoospores swimming out of sporangium. From narrowleaf madole variety.
5368383 Phytophthora blight Phytophthora capsici Immature, infected fruit
5368384 Phytophthora blight Phytophthora capsici Close-up of infected fruit surface showing two sporangia at tip of arrow.
5368385 Phytophthora blight Phytophthora capsici Detached sporangia of Phytophthora capsici.
5368386 Phytophthora blight Phytophthora capsici Close-up of detached sporangia of Phytophthora capsici.
5368387 Phytophthora blight Phytophthora capsici Detached sporangia of Phytophthora capsici.
5368388 Phytophthora blight Phytophthora capsici Detached sporangia of Phytophthora capsici.
5368389 Phytophthora blight Phytophthora capsici Infected, moldy fruit.
5368390 Phytophthora blight Phytophthora capsici Infected, moldy fruit.
5368391 Phytophthora blight Phytophthora capsici Infected plants with symptoms of dieback and overall stunted growth when compared to plants at right.
5368392 Phytophthora blight Phytophthora capsici Infected, moldy fruit.
5368393 Phytophthora blight Phytophthora capsici Infected, moldy fruit.
5368394 Phytophthora blight Phytophthora capsici Infected, moldy fruit.
5368443 downy mildew Pseudoperonospora cubensis Close-up of one infected area where the black dots are groups of dark spores.
5368444 downy mildew Pseudoperonospora cubensis Branched sporangiaphores and dark brown sporangia.
5368804 Phytophthora root and crown rots Phytophthora spp. Fruit decay is dark brown often with darkened, wavy rings around the margin.
5368805 Phytophthora root and crown rots Phytophthora spp. Single, decayed fruit with darkened, wavy rings around the margin.
5368806 Phytophthora root and crown rots Phytophthora spp. Single, decayed fruit with darkened, wavy rings around the margin.
5368807 Phytophthora root and crown rots Phytophthora spp. Single, decayed fruit with darkened, infected area.
5369048 Pythium diseases Pythium spp. Roots turn gray/black and outer root tissue can pull away easily.
5369049 Pythium diseases Pythium spp. Roots turn gray/black and outer root tissue can pull away easily.
5369050 Pythium diseases Pythium spp. sexual reproductive spores ("oospores") seen in roots; look like hollow tires.
5369051 Pythium diseases Pythium spp. A single sexual reproductive spore ("oospore")
5368735 downy mildew Plasmopara halstedii white fungal growth on the underside of infected portions of leaves which can turn brown/black in time
5368736 downy mildew Plasmopara halstedii Portions of infected leaves will become necrotic.
5368670 Phytophthora blight Phytophthora nicotianae Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank. Dark variety VA 359
5368671 Phytophthora blight Phytophthora nicotianae Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank. Dark variety VA 359
5368672 Phytophthora blight Phytophthora nicotianae Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank. Dark variety VA 359
5368673 Phytophthora blight Phytophthora nicotianae Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank. Dark variety VA 359
5368674 Phytophthora blight Phytophthora nicotianae Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank". Dark variety VA 359
5368675 Phytophthora blight Phytophthora nicotianae Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank". Dark tobacco.
5368676 Phytophthora blight Phytophthora nicotianae Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank". Dark tobacco.
5368677 Phytophthora blight Phytophthora nicotianae Leaves with symptoms of the disease "Black shank" in this case called "Foliar Black shank". Dark tobacco.
5368737 downy mildew Plasmopara halstedii Portions of infected leaves will become necrotic.
5369011 Pythium diseases Pythium spp. oospores in root tissue. Narrowleaf Madole
5369012 Pythium diseases Pythium spp. oospores in root tissue. Narrowleaf Madole
5369013 Pythium diseases Pythium spp. oospores in root tissue. Narrowleaf Madole
5369014 Pythium diseases Pythium spp. oospores in root tissue. Narrowleaf Madole
5368738 downy mildew Plasmopara halstedii white fungal growth on the underside of infected portions of leaves which can turn brown/black in time
5368320 Phytophthora root and stem rot Phytophthora drechsleri Lower stem of a symptomatic plant. Fungal growth on the outside of the lower stem is not from the causal agent.
5368321 Phytophthora root and stem rot Phytophthora drechsleri Stem split to see decay of pith tissue of the lower stem.
5368322 Phytophthora root and stem rot Phytophthora drechsleri Close-up of infected pith tissue with disking similar to that seen with Black shank of tobacco.
5368323 Phytophthora root and stem rot Phytophthora drechsleri Stem split to see decay of pith tissue of the lower stem.
5368324 Phytophthora root and stem rot Phytophthora drechsleri Pith tissue incubated in water induces formation of a sporangium. This one is empty of spores.
5368325 Phytophthora root and stem rot Phytophthora drechsleri Pith tissue incubated in water induces formation of several sporangium.
5368326 Phytophthora root and stem rot Phytophthora drechsleri Mycelium of Phytophthora dreschleri in culture.
5368327 Phytophthora root and stem rot Phytophthora drechsleri Swollen, lobed, sporangia of Phytophthora dreschleri in culture.
5368328 Phytophthora root and stem rot Phytophthora drechsleri Two sporangia where a new sporangium is growing up through the remains of an older, empty sporangium.
5368329 Phytophthora root and stem rot Phytophthora drechsleri A new hyphal structure growing from below the base of an older, empty sporangium.
5368330 Phytophthora root and stem rot Phytophthora drechsleri A sporangium before it has released its spores.
5368331 Phytophthora root and stem rot Phytophthora drechsleri Zoospores just in the process of releasing from a sporangium.
5368332 Phytophthora root and stem rot Phytophthora drechsleri Zoospores swimming away from the sporangium.
5368333 Phytophthora root and stem rot Phytophthora drechsleri Zoospores released from the sporangium with two remaining in the sporangium.
5368334 Phytophthora root and stem rot Phytophthora drechsleri Zoospores beginning to move away from the vicinity of the sporangium.
5368441 downy mildew Pseudoperonospora cubensis Close-up of upper side of pumpkin leaf with infected areas at first being yellow and then becoming necrotic.
5368442 downy mildew Pseudoperonospora cubensis Close-up of underside of the infected areas which look more like discrete spots.
5368624 Pythium diseases Pythium spp. tissue decay due to infection by a species of Pythium
5368625 Pythium diseases Pythium spp. tissue decay due to infection by a species of Pythium
5368626 Pythium diseases Pythium spp. oospores of a species of Pythium
5368627 Pythium diseases Pythium spp. oospores of a species of Pythium
5368628 Pythium diseases Pythium spp. oospores of a species of Pythium
5368629 Pythium diseases Pythium spp. oospores of a species of Pythium
5368662 blue mold Peronospora tabacina Yellow spots on upper leaf surface with corresponding moldy growth on lower leaf surface; seedling plants. Variety TN 86
5368663 blue mold Peronospora tabacina Yellow spots on upper leaf surface with corresponding moldy growth on lower leaf surface; seedling plants.Variety TN 86
5368665 blue mold Peronospora tabacina Yellow spots on upper leaf surface with corresponding moldy growth on lower leaf surface; seedling plants
5368703 Phytophthora blight Phytophthora nicotianae Asexual spore-producing bodies called "sporangia" of the fungus. When the sporangia is hollow-looking it has produced zoospores and they swam away in search of susceptible host tissue. KY-14XL8
5368704 Phytophthora blight Phytophthora nicotianae Asexual spore-producing bodies called "sporangia" of the fungus. When the sporangia is hollow-looking it has produced zoospores and they swam away in search of susceptible host tissue. KY-14XL8
5368706 Phytophthora blight Phytophthora nicotianae Asexual spore-producing bodies called "sporangia" of the fungus. When the sporangia is hollow-looking it has produced zoospores and they swam away in search of susceptible host tissue. KY-14XL8
5368763 downy mildew Peronospora spp. Red/purple spots or blotches with barely visible downy mycelial growth in spots on lower side of leaves.Apache variety.
5368764 downy mildew Peronospora spp. Red/purple spots or blotches with barely visible downy mycelial growth in spots on lower side of leaves.Apache variety.
5368765 downy mildew Peronospora spp. Red/purple spots or blotches with barely visible downy mycelial growth in spots on lower side of leaves. Apache variety.
5368766 downy mildew Peronospora spp. Red/purple spots or blotches with barely visible downy mycelial growth in spots on lower side of leaves. Apache variety.
5368875 Pythium diseases Pythium spp. Plants were overwatered which stressed the plants. Roots were infected with Pythium and Rhizoctonia.
5368876 Pythium diseases Pythium spp. Plants were overwatered which stressed the plants. Roots were infected with Pythium and Rhizoctonia.
5368879 Pythium diseases Pythium spp. filamentous and one terminal sporangia. Tennessee 90
5368880 Pythium diseases Pythium spp. filamentous and one terminal sporangia with zoospores (round structure at bottom right). Tennessee 90
5368881 Pythium diseases Pythium spp. filamentous sporangia. Tennessee 90
5368882 Pythium diseases Pythium spp. zoospores releasing from a terminal sporangium. Tennessee 90
5368895 blue mold Peronospora tabacina Lower leaf surface with moldy growth on the fungus. Hybrid 403.
5368896 blue mold Peronospora tabacina Spots on upper leaf surface beginning to become necrotic with slight yellow halo. Hybrid 403.
5368897 blue mold Peronospora tabacina Yellow to necrotic spots on upper leaf surface with faint yellow halo. Hybrid 403.
5368898 blue mold Peronospora tabacina Moldy growth of fungus on lower leaf surface. Hybrid 403.
5368900 downy mildew Sclerophthora macrospora Symptom of "Crazy top" with tassel replaced by a mass of leafy tissue.
5368901 downy mildew Sclerophthora macrospora No ears but excessive tallness is likely genetic; not a symptom of "Crazy top".
5368902 downy mildew Sclerophthora macrospora rolling of the upper leaves, symptom of "Crazy top"
5368903 downy mildew Sclerophthora macrospora Close-up of rolling of the upper leaves; a symptom of "Crazy top"
5368986 Phytophthora blight Phytophthora capsici Close-up of one infected stem showing collapsed tissue and white, fungal mycelium.
5368987 Phytophthora blight Phytophthora capsici Close-up of multiple stem infections showing collapsed tissue.
5368988 Phytophthora blight Phytophthora capsici Stem infections showing collapsed tissue.
5368989 Phytophthora blight Phytophthora capsici Close-up of multiple stem infections showing collapsed tissue.
5368995 downy mildew Peronospora manshurica brown spots caused by infection of Peronospora manshurica
5368996 downy mildew Peronospora manshurica brown spots caused by infection of Peronospora manshurica
5368997 downy mildew Peronospora manshurica spore-producing structures of the fungus Peronospora manshurica on underside of leaf
5332059 Phytophthora blight Phytophthora nicotianae
5332070 blue mold Peronospora tabacina
5332050 Phytophthora root and stem rot Phytophthora megasperma
5332042 downy mildew Sclerophthora macrospora
5332057 Phytophthora root and stem rot Phytophthora megasperma
5332054 downy mildew Peronospora manshurica
5333045 late blight Phytophthora infestans
5333046 late blight Phytophthora infestans
5333060 late blight Phytophthora infestans
5333061 late blight Phytophthora infestans Symptoms and signs
5331074 downy mildew Peronospora parasitica
5331071 downy mildew Peronospora parasitica
5331072 downy mildew Peronospora parasitica
5331073 downy mildew Peronospora parasitica
5361920 Phytophthora root and crown rots Phytophthora spp. An apple tree with a Phytophthora crown rot infection caused by Phytophthora spp. in the field.
5361918 Phytophthora root and crown rots Phytophthora spp. Premature fall leaf coloration of an apple tree due to Phytophthora crown rot infection caused by Phytophthora spp. in the field.
5373570 Pythium diseases Pythium spp.
5373571 Pythium diseases Pythium spp.
5373365 Phytophthora blight Phytophthora nicotianae
5373361 Phytophthora blight Phytophthora nicotianae
5373362 Phytophthora blight Phytophthora nicotianae
5373363 Phytophthora blight Phytophthora nicotianae
5373364 Phytophthora blight Phytophthora nicotianae
5373358 Phytophthora blight Phytophthora nicotianae
5373359 Phytophthora blight Phytophthora nicotianae
5373360 Phytophthora blight Phytophthora nicotianae
5377620 Phytophthora blight Phytophthora nicotianae
5373357 Phytophthora blight Phytophthora nicotianae
5373355 Phytophthora root and crown rots Phytophthora spp.
5373356 Phytophthora root and crown rots Phytophthora spp.
5373352 Phytophthora blight Phytophthora nicotianae
5373353 Phytophthora blight Phytophthora nicotianae
5373350 Phytophthora blight Phytophthora nicotianae
5373351 Phytophthora blight Phytophthora nicotianae
5373346 Phytophthora blight Phytophthora nicotianae
5373347 Phytophthora blight Phytophthora nicotianae
5373348 Phytophthora blight Phytophthora nicotianae
5373349 Phytophthora blight Phytophthora nicotianae
5373345 Phytophthora blight Phytophthora nicotianae
5373344 Phytophthora blight Phytophthora nicotianae
5373342 Phytophthora blight Phytophthora nicotianae
5373343 Phytophthora blight Phytophthora nicotianae
5373340 Phytophthora blight Phytophthora nicotianae
5373341 Phytophthora blight Phytophthora nicotianae
5373338 Phytophthora blight Phytophthora nicotianae
5373339 Phytophthora blight Phytophthora nicotianae
5373335 Phytophthora blight Phytophthora nicotianae
5373336 Phytophthora blight Phytophthora nicotianae
5373337 Phytophthora blight Phytophthora nicotianae
5373333 Phytophthora blight Phytophthora nicotianae
5373334 Phytophthora blight Phytophthora nicotianae
5377619 Phytophthora blight Phytophthora nicotianae
5373330 Phytophthora blight Phytophthora nicotianae
5373331 Phytophthora blight Phytophthora nicotianae
5373328 Phytophthora root and crown rots Phytophthora spp.
5373327 Phytophthora root and crown rots Phytophthora spp.
5373326 Phytophthora root and crown rots Phytophthora spp.
5373325 Phytophthora root and crown rots Phytophthora spp.
5373324 Phytophthora root and crown rots Phytophthora spp.
5373322 Phytophthora root and crown rots Phytophthora spp.
5373323 Phytophthora root and crown rots Phytophthora spp.
5373319 Phytophthora root and crown rots Phytophthora spp.
5373320 Phytophthora root and crown rots Phytophthora spp.
5373321 Phytophthora root and crown rots Phytophthora spp.
5373318 Phytophthora root and crown rots Phytophthora spp.
5373316 Phytophthora blight Phytophthora nicotianae
5373317 Phytophthora blight Phytophthora nicotianae
5373314 Phytophthora blight Phytophthora nicotianae
5373315 Phytophthora blight Phytophthora nicotianae
5373311 Phytophthora blight Phytophthora nicotianae
5373312 Phytophthora blight Phytophthora nicotianae
5373313 Phytophthora blight Phytophthora nicotianae
5373309 Phytophthora blight Phytophthora nicotianae
5373310 Phytophthora blight Phytophthora nicotianae
5373308 Phytophthora blight Phytophthora nicotianae
5373306 Phytophthora blight Phytophthora nicotianae
5373307 Phytophthora blight Phytophthora nicotianae
5373305 Phytophthora blight Phytophthora nicotianae
5373302 Phytophthora root and crown rots Phytophthora spp.
5373303 Phytophthora root and crown rots Phytophthora spp.
5373304 Phytophthora root and crown rots Phytophthora spp.
5373300 Phytophthora root and crown rots Phytophthora spp.
5373301 Phytophthora root and crown rots Phytophthora spp.
5373298 Phytophthora root and crown rots Phytophthora spp.
5373299 Phytophthora root and crown rots Phytophthora spp.
5373291 Phytophthora basal canker Phytophthora palmivora
5373289 Phytophthora basal canker Phytophthora palmivora
5373290 Phytophthora basal canker Phytophthora palmivora
5373288 Phytophthora basal canker Phytophthora palmivora
5373286 Phytophthora root and crown rots Phytophthora spp.
5373282 Phytophthora root and crown rots Phytophthora spp.
5373283 Phytophthora root and crown rots Phytophthora spp.
5373285 Phytophthora root and crown rots Phytophthora spp.
5373284 Phytophthora blight Phytophthora nicotianae
5373279 Phytophthora root and crown rots Phytophthora spp.
5373280 Phytophthora root and crown rots Phytophthora spp.
5373281 Phytophthora root and crown rots Phytophthora spp.
5373277 Phytophthora root and crown rots Phytophthora spp.
5373276 Phytophthora root and crown rots Phytophthora spp.
5373272 Phytophthora root and crown rots Phytophthora spp.
5373273 Phytophthora root and crown rots Phytophthora spp.
5373274 Phytophthora root and crown rots Phytophthora spp.
5373275 Phytophthora root and crown rots Phytophthora spp.
5373271 Phytophthora root and crown rots Phytophthora spp.
5373269 Phytophthora root and crown rots Phytophthora spp.
5373270 Phytophthora root and crown rots Phytophthora spp.
5373266 Phytophthora root and crown rots Phytophthora spp.
5373267 Phytophthora root and crown rots Phytophthora spp.
5373268 Phytophthora root and crown rots Phytophthora spp.
5373263 Phytophthora root and crown rots Phytophthora spp.
5373264 Phytophthora root and crown rots Phytophthora spp.
5373265 Phytophthora root and crown rots Phytophthora spp.
5373262 Phytophthora root and crown rots Phytophthora spp.
5373253 Phytophthora root and crown rots Phytophthora spp.
5223020 downy mildew Peronospora sparsa
5223021 downy mildew Peronospora sparsa
5257014 downy mildew Peronospora sparsa
5223018 downy mildew Peronospora sparsa
5223019 downy mildew Peronospora sparsa
5028035 sudden oak death Phytophthora ramorum
5377179 downy mildew Pseudoperonospora cubensis
0725043 Phytophthora root rot of raspberry Phytophthora fragariae rubi Sudden wilt of suckers of the year. Foci extend from one year to another according to the soil cultural operations and rainwash.
0725034 Phytophthora root rot of raspberry Phytophthora fragariae rubi Wilting of a raspberry cane of two-years old, when fruits are riped. Plants are dying by dessication, as roots completely loose their assimilation capability.
0725032 Phytophthora root rot of raspberry Phytophthora fragariae rubi Symptoms of Phytophthora fragariae var. rubi on raspberry roots (Rubus idaeus var. Glen Moy). Note the reddish coloured area on the root.
0725033 Phytophthora root rot of raspberry Phytophthora fragariae rubi Symptoms of Phytophthora fragariae var. rubi on raspberry roots (Rubus idaeus var. Glen Moy). Note the brownish area sharply demarcated from healthy tissue.
0725009 downy mildew Plasmopara halstedii Green and chlorotic mottling along the main veins due to Plasmopara halstedii on sunflower.
0725006 Phytophthora root rot of raspberry Phytophthora fragariae rubi Healthy raspberry roots (right) and roots infected by Phytophthora fragariae var. rubi (left). On infected plants, the secondary root system is completely destroyed, and wilting is then irreversible.
0725005 Phytophthora root rot of raspberry Phytophthora fragariae rubi Symptoms of Phytophthora fragariae var. rubi on raspberry roots (Rubus idaeus var. Glen Moy). Note the brownish area sharply demarcated from healthy tissue and the redish discoloration on some roots.
5377181 downy mildew Pseudoperonospora cubensis Downy mildew on cucumber. Note the angular lesions characteristic of the disease on cucumber.
5377180 downy mildew Pseudoperonospora cubensis Cucumber field infected with downy mildew. Tan area down the center of the bed is plant tissue killed by the disease. This occurs very quickly, giving it the nickname ‘wildfire’.
5377178 downy mildew Pseudoperonospora cubensis Dichotomously branched sporangiophore and lemon-shaped sporangia of P. cubensis at 400x magnification.
5377184 downy mildew Pseudoperonospora cubensis Downy mildew on cantaloupe (cultivar Athena). Note that lesions are not angular as in cucumber and have a bright yellow halo.
5377182 downy mildew Pseudoperonospora cubensis Lower surface of cucumber leaf reveals water-soaked tissue and pathogen sporulation
0656016 downy mildew Plasmopara halstedii Sunflower severely affected by downy mildew (Plasmopara halstedii) in the field, showing retarded growth, leaf chlorosis and horizontal head.
0656017 downy mildew Plasmopara halstedii Young sunflower plants affected by downy mildew (Plasmopara halstedii) in the field, with fungal sporulation on the lower leaf surface.
5361614 white rust Albugo tragopogonis A sunflower leaf with white rust infection caused by Albugo tragopogonis in the field.
5361613 white rust Albugo tragopogonis A sunflower leaf with white rust infection caused by Albugo tragopogonis in the field.
5361612 white rust Albugo tragopogonis Sunflower leaves with white rust (both leaves) and red rust (mainly the leaf on the right) infections caused by Albugo tragopogonis and Puccinia helianthi respectively.
5361118 Pythium diseases Pythium spp. A cowpea (black-eyed pea/southern pea) plant infected with Pythium wilt caused by Pythium spp.in the field.
5359209 Phytophthora blight Phytophthora capsici A zucchini squash  field showing symptoms of Phytophthora wilt infection caused by Phytophthora capsici.
5359704 Pythium diseases Pythium spp. Lawn infected with Pythium blight (Pythium sp.) in Pueblo, Colorado, in 1981.
1525110 downy mildew of potentilla Peronospora potentillae
1525111 downy mildew of potentilla Peronospora potentillae
1525112 downy mildew of potentilla Peronospora potentillae
1525113 downy mildew of potentilla Peronospora potentillae
5356772 Phytophthora root and crown rots Phytophthora spp. Phytophthora collar rot (Phytophthora sp.) on a young apple tree.
5357120 downy mildew Sclerophthora macrospora Rice plant in the hand, showing symptoms of infection with downy mildew (Sclerophthora macrospora).
5356988 downy mildew Sclerophthora macrospora Rice plant showing signs of infection with downy mildew (Sclerophthora macrospora).
5365826 downy mildew Peronospora parasitica Downy mildew infection of cabbage caused by Peronospora parasitica.
5365825 downy mildew Peronospora parasitica Downy mildew infection of cabbage caused by Peronospora parasitica.
5363722 Phytophthora blight Phytophthora capsici A zucchini squash plant showing symptoms of Phytophthora wilt caused by Phytophthora capsici in the field.
5357039 Phytophthora blight Phytophthora capsici Pepper plants showing symptoms of infection with Phytophthora wilt (Phytophthora capsici).
5366530 Phytophthora root and crown rots Phytophthora spp. Raspberry plants in a field showing symptoms of infection with Phtytophthora root and crown rot (Phytophthora sp.).
5366528 Phytophthora root and crown rots Phytophthora spp. Soil removed from raspberry roots to show symptoms of infection with Phtytophthora root and crown rot (Phytophthora sp.).
5359199 Phytophthora blight Phytophthora capsici The xylem of a pepper plant infected with Phytophthora wilt caused by Phytophthora capsici.
5359198 Phytophthora blight Phytophthora capsici An uprooted pepper plant infected with Phytophthora wilt caused by Phytophthora capsici.
5359196 Phytophthora blight Phytophthora capsici A field of pepper plants infected with Phytophthora wilt caused by Phytophthora capsici.
5359197 Phytophthora blight Phytophthora capsici A field of pepper plants infected with Phytophthora wilt caused by Phytophthora capsici.
5358419 Pythium diseases Pythium spp. Melon seedlings showing damping off symptoms caused by Pythium spp..
5362265 downy mildew Peronospora destructor Onion plants displaying symptoms of downy mildew, Peronospora destructor.
5362524 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato field at Kersey in 1997.
5362522 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato field at Platteville in 1997.
5362520 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato field at Platteville in 1997.
5362521 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato field at Platteville in 1997.
5362511 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato leaflet on a field at Platteville in 1997.
5362523 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato field at Kersey in 1997.
5362519 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato plant on a field at Platteville in 1997.
5362517 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato plant on a field at Platteville in 1997.
5362518 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato plant on a field at Platteville in 1997.
5362516 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato plant on a field at Platteville in 1997.
5362514 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato plant on a field at Platteville in 1997.
5362515 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato plant on a field at Platteville in 1997.
5362513 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato plant on a field at Platteville in 1997.
5362512 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato leaflet on a field at Platteville in 1997.
5362509 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato plant on a field at Platteville in 1997.
5362510 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato plant on a field at Platteville in 1997.
5362508 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato field at Platteville in 1997.
5362506 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato field at Platteville in 1997.
5362507 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection of  a potato field at Platteville in 1997.
5365612 Pythium diseases Pythium spp. A snap bean (Phaseolus vulgaris) field showing wilt infection caused by the fungus Pythium spp..
5365611 Pythium diseases Pythium spp. A snap bean (Phaseolus vulgaris) field showing wilt infection caused by the fungus Pythium spp..
5356839 late blight Phytophthora infestans Field plots in Bolivia testing potato varieties for resistance to late blight (Phytophthora infestans) in 1978.
5356838 late blight Phytophthora infestans Potato leaf showing signs of infection with late blight (Phytophthora infestans).
5356795 late blight Phytophthora infestans Potato foliage showing signs of infection with late blight (Phytophthora infestans).
5365781 late blight Phytophthora infestans Late blight (Phytophthora infestans) infection on the leaflet of a potato plant.
5365780 late blight Phytophthora infestans Late blight (Phytophthora infestans) on potato tubers only 10 days after infection.
5365779 late blight Phytophthora infestans Potato leaf showing signs of infection with late blight (Phytophthora infestans).
5362905 late blight Phytophthora infestans A potato leaflet showing late blight infection caused by Phytophthora infestans on a potato field at Peckham.
5362903 late blight Phytophthora infestans A potato leaflet showing late blight infection caused by Phytophthora infestans on a potato field at Peckham.
5362904 late blight Phytophthora infestans A potato leaflet showing late blight infection caused by Phytophthora infestans on a potato field at Peckham.
5362901 late blight Phytophthora infestans A potato leaflet showing late blight infection caused by Phytophthora infestans on a potato field at Peckham.
5362902 late blight Phytophthora infestans A potato leaflet showing late blight infection caused by Phytophthora infestans on a potato field at Peckham.
5362899 late blight Phytophthora infestans A potato leaflet showing late blight infection caused by Phytophthora infestans on a potato field at Peckham.
5362900 late blight Phytophthora infestans A potato leaflet showing late blight infection caused by Phytophthora infestans on a potato field at Peckham.
5362898 late blight Phytophthora infestans A potato leaflet showing late blight infection caused by Phytophthora infestans on a potato field at Peckham.
5362897 late blight Phytophthora infestans A potato plant showing late blight infection caused by Phytophthora infestans on a potato field at Peckham.
5362896 late blight Phytophthora infestans A potato plant showing late blight infection caused by Phytophthora infestans on a potato field at Peckham.
5362894 late blight Phytophthora infestans A potato plant showing late blight infection caused by Phytophthora infestans.
5362895 late blight Phytophthora infestans A potato plant showing late blight infection caused by Phytophthora infestans.
5362893 late blight Phytophthora infestans A potato plant showing late blight infection caused by Phytophthora infestans.
5362892 late blight Phytophthora infestans A potato plant showing late blight infection caused by Phytophthora infestans.
5362890 late blight Phytophthora infestans A potato plant showing late blight infection caused by Phytophthora infestans.
5362891 late blight Phytophthora infestans A potato plant showing late blight infection caused by Phytophthora infestans.
5362889 late blight Phytophthora infestans A potato plant showing late blight infection caused by Phytophthora infestans.
5362887 late blight Phytophthora infestans A potato field showing late blight infection caused by Phytophthora infestans.
5362888 late blight Phytophthora infestans A potato field showing late blight infection caused by Phytophthora infestans.
5362886 late blight Phytophthora infestans A potato field showing late blight infection caused by Phytophthora infestans.
5362884 late blight Phytophthora infestans A potato field showing late blight infection caused by Phytophthora infestans.
5362885 late blight Phytophthora infestans A potato field showing late blight infection caused by Phytophthora infestans.
5362883 late blight Phytophthora infestans A potato field showing late blight infection caused by Phytophthora infestans.
5359553 white rust Albugo tragopogonis Pigweed (Amaranthus retroflexus) leaves harboring the white rust pathogen Albugo tragopogonis.
5359552 white rust Albugo tragopogonis Pigweed (Amaranthus retroflexus) leaves harboring the white rust pathogen Albugo tragopogonis.
5366640 Pythium diseases Pythium spp. Corn seedling showing symptoms of seedling blight, caused by Pythium sp. and/or Penicillium sp.
5356769 downy mildew Plasmopara viticola Grapevines showing defoliation from downy mildew (Plasmopara viticola) and straw placed over the stems to protect them from sunburn.
1524156 blue mold Peronospora tabacina Blue mold on tobacco
1525005 Phytophthora blight Phytophthora nicotianae Crown root on African violet
1525006 Phytophthora blight Phytophthora nicotianae
5361373 Pythium diseases Pythium spp. Drybean seedlings showing symptoms of Pythium damping off caused by Pythium spp.
5362264 downy mildew Peronospora destructor Onion downy mildew disease (Peronospora destructor).
5362222 downy mildew Peronospora destructor Agricultural Research Demonstration Education Center (ARDEC), Fort Collins, Colorado onion trial, Onion Disease, Onion Downy Mildew, Pesticide application
5362218 downy mildew Peronospora destructor Agricultural Research Demonstration Education Center (ARDEC), Fort Collins, Colorado onion trial, 09/10/1997, Onion Disease, Onion Downy Mildew, Pesticide application
5364057 downy mildew Peronospora destructor A close-up shot of downy mildew Peronospora destructor on an onion leaf.
5361485 downy mildew Peronospora destructor An in-filed focus of onion downy mildew, Peronospora destructor.
5361484 downy mildew Peronospora destructor Advanced leaf symptoms of downy mildew, Peronospora destructor on a field of onion plants
5361483 downy mildew Peronospora destructor Advanced leaf symptoms of downy mildew, Peronospora destructor on a field of onion plants.
5361482 downy mildew Peronospora destructor Early leaf symptoms of downy mildew, Peronospora destructor on a field onion plants.
5361481 downy mildew Peronospora destructor Early leaf symptoms of downy mildew, Peronospora destructor on a field onion plant leaf.
5361480 downy mildew Peronospora destructor Early leaf symptoms of downy mildew, Peronospora destructor on a field onion plant leaf.
5359354 Pythium diseases Pythium spp. Damping off (Pythium sp.) of onion seedlings.
5357622 downy mildew Peronospora destructor Graphic display of downy mildew on onions
5357391 downy mildew Peronospora destructor Onions in a research plot studying downy mildew.
5357390 downy mildew Peronospora destructor Onions in plot researching downy mildew.
5357389 downy mildew Peronospora destructor Onions in a field plot, research on downy mildew.
5357388 downy mildew Peronospora destructor Field plot, research on downy mildew in onions.
5357387 downy mildew Peronospora destructor Field plot, research conducted on downy mildew in onions.
5357386 downy mildew Peronospora destructor Weather station set up in an onion field for research on downy mildew.
1492225 Phytophthora root and crown rots Phytophthora spp. Phytophthora isolated
5340093 downy mildew Pseudoperonospora cubensis Cucumber cv. LaFayette; downy mildew caused by Pseudoperonospora cubensis; leaves collected during rain and scanned on a flatbed scanner a few hours later; shows watersoaking of tissue shortly before sporulation; See 5340094 for view of upper leaf surface of same leaf.
5340094 downy mildew Pseudoperonospora cubensis cucumber cv. LaFayette; downy mildew caused by Pseudoperonospora cubensis; leaves collected during rain and scanned on a flatbed scanner a few hours later; shows watersoaking of tissue shortly before sporulation; See 5340093 for view of lower leaf surface of same leaf. Water soaking is much more subtle on upper leaf surface.
1524004 Phytophthora root and stem rot Phytophthora megasperma
1495079 downy mildew Plasmopara viticola downy mildew on grape
1495081 downy mildew Plasmopara viticola downy mildew
1495082 downy mildew Plasmopara viticola Plamopara viticola; downy mildew
1495083 downy mildew Plasmopara viticola Plasmopara viticola; downy mildew expanded infection
1495084 downy mildew Plasmopara viticola downy mildew; later summer and fall infections
1495087 downy mildew Plasmopara viticola Plasmopara viticola; downy mildew
1497016 blue mold Peronospora tabacina Peronospora tabacina; tobacco blue mold
1497017 blue mold Peronospora tabacina Peronospora tabacina; Tobacco blue mold
1497018 blue mold Peronospora tabacina Peronospora tabacina; Tobacco blue mold
1497019 blue mold Peronospora tabacina Peronospora tabacina; Tobacco blue mold
1497020 blue mold Peronospora tabacina Peronospora tabacina; Tobacco blue mold
1497022 blue mold Peronospora tabacina Peronospora tabacina; Tobacco blue mold
1497009 Phytophthora blight Phytophthora nicotianae Brown spot on tobacco
1497010 Phytophthora blight Phytophthora nicotianae Black shank on tobacco
1497011 Phytophthora blight Phytophthora nicotianae Phytophthora parasitica var. nicotianae; Tobacco black shank
1497012 Phytophthora blight Phytophthora nicotianae Black shank on tobacco
1497013 Phytophthora blight Phytophthora nicotianae Black shank tobacco
1497014 Phytophthora blight Phytophthora nicotianae Black shank on tobacco
1497015 Phytophthora blight Phytophthora nicotianae Black shank on tobacco
1497059 Phytophthora blight Phytophthora nicotianae Black shank on tobacco
5076093 Pythium diseases Pythium spp. Pythium cottony leak on cucumber fruit. White, cotton like mass that may cover the entire fruit. Jelly or liquid may ooze from within the fruit.
1473271 Phytophthora root rot Phytophthora cinnamomi site #70, disease present since 1933 (picture taken 1953)
1524161 Phytophthora blight Phytophthora nicotianae
1524154 blue mold Peronospora tabacina
1524157 blue mold Peronospora tabacina
1525136 Pythium diseases Pythium spp.
1525137 Pythium diseases Pythium spp.
1525134 Pythium diseases Pythium spp.
1524003 Phytophthora root and stem rot Phytophthora megasperma
5257059 late blight Phytophthora infestans
5026063 downy mildew Peronospora sparsa
5262068 Phytophthora tropicalis Phytophthora tropicalis
5262069 Phytophthora tropicalis Phytophthora tropicalis sporangia
5262070 Phytophthora tropicalis Phytophthora tropicalis sporangia
5262071 Phytophthora tropicalis Phytophthora tropicalis
5262072 Phytophthora tropicalis Phytophthora tropicalis sporangium
5262073 Phytophthora tropicalis Phytophthora tropicalis sporangia
5262074 Phytophthora tropicalis Phytophthora tropicalis sporangia
5262075 Phytophthora tropicalis Phytophthora tropicalis sporangia
5262076 Phytophthora tropicalis Phytophthora tropicalis sporangia
5262077 Phytophthora tropicalis Phytophthora tropicalis sporangia
5262044 Phytophthora root rot Phytophthora cinnamomi sporangium; soil bait (blueberry)
5262045 Phytophthora root rot Phytophthora cinnamomi soil bait (blueberry)
5262046 Phytophthora root rot Phytophthora cinnamomi soil bait (blueberry)
5262047 Phytophthora root rot Phytophthora cinnamomi soil bait (blueberry)
5262048 Phytophthora root rot Phytophthora cinnamomi
5262049 Phytophthora root rot Phytophthora cinnamomi soil bait (blueberry)
5262050 Phytophthora root rot Phytophthora cinnamomi soil bait (blueberry)
5262051 Phytophthora root rot Phytophthora cinnamomi sporangium; soil bait (blueberry)
5262052 Phytophthora root rot Phytophthora cinnamomi soil bait (blueberry)
5262053 Phytophthora root rot Phytophthora cinnamomi sporangium; soil bait (blueberry)
5262054 Phytophthora root rot Phytophthora cinnamomi soil bait (blueberry)
5262055 Phytophthora root rot Phytophthora cinnamomi soil bait (blueberry)
5262056 Phytophthora root rot Phytophthora cinnamomi soil bait (blueberry)
5262057 Phytophthora root rot Phytophthora cinnamomi soil bait (blueberry)
5262058 Phytophthora root rot Phytophthora cinnamomi soil bait (blueberry)
5262059 Phytophthora root rot Phytophthora cinnamomi soil bait (blueberry)
5262060 Phytophthora root rot Phytophthora cinnamomi soil bait (blueberry)
5262061 Phytophthora root rot Phytophthora cinnamomi soil bait (blueberry)
5262067 Phytophthora tropicalis Phytophthora tropicalis
5257088 late blight Phytophthora infestans
5257090 late blight Phytophthora infestans surface disinfecting foliage
5257074 late blight Phytophthora infestans
5257075 late blight Phytophthora infestans
5257079 late blight Phytophthora infestans oospore germination
5257080 late blight Phytophthora infestans disinfesting tubers
5257081 late blight Phytophthora infestans
5257082 late blight Phytophthora infestans
5257083 late blight Phytophthora infestans
5257084 late blight Phytophthora infestans
5257085 late blight Phytophthora infestans
5257086 late blight Phytophthora infestans
5262043 Phytophthora root rot Phytophthora cinnamomi sporangium; soil bait (blueberry)
5262063 Phytophthora tropicalis Phytophthora tropicalis
5262064 Phytophthora tropicalis Phytophthora tropicalis
5262065 Phytophthora tropicalis Phytophthora tropicalis
5262066 Phytophthora tropicalis Phytophthora tropicalis
5262062 Phytophthora tropicalis Phytophthora tropicalis
5261088 Phytophthora root rot Phytophthora cinnamomi
5261089 Phytophthora root rot Phytophthora cinnamomi
5261097 downy mildew Plasmopara halstedii
5261098 downy mildew Plasmopara halstedii
5261099 downy mildew Plasmopara halstedii
5261100 downy mildew Plasmopara halstedii
5262001 downy mildew Plasmopara halstedii
5260092 Phytophthora root rot Phytophthora cinnamomi
5257069 late blight Phytophthora infestans
5257070 late blight Phytophthora infestans
5257071 late blight Phytophthora infestans
5257072 late blight Phytophthora infestans
5257076 late blight Phytophthora infestans zoospores released from sporangium
5257077 late blight Phytophthora infestans
5257078 late blight Phytophthora infestans zoospores released from sporangium; indirect germination
5257092 late blight Phytophthora infestans zoospores released from sporangium
5257087 late blight Phytophthora infestans
5257091 late blight Phytophthora infestans atypical leaf symptoms
5257089 late blight Phytophthora infestans atypical leaf symptoms
5257073 late blight Phytophthora infestans oospore
5257099 downy mildew Plasmopara viburni
5257095 late blight Phytophthora infestans
5257096 late blight Phytophthora infestans
5257025 blue mold Peronospora tabacina
5257100 downy mildew Plasmopara viticola
5258001 downy mildew Plasmopara viticola
5258002 downy mildew Plasmopara viticola
5258003 downy mildew Plasmopara viticola
5258004 downy mildew Plasmopara viticola
5258005 downy mildew Plasmopara viticola
5257060 late blight Phytophthora infestans
5257061 late blight Phytophthora infestans
5257062 late blight Phytophthora infestans
5257063 late blight Phytophthora infestans
5257064 late blight Phytophthora infestans
5257065 late blight Phytophthora infestans
5257066 late blight Phytophthora infestans
5257067 late blight Phytophthora infestans
5257068 late blight Phytophthora infestans
5257094 late blight Phytophthora infestans atypical leaf symptoms atypical
5257015 downy mildew Peronospora sparsa
5257016 downy mildew Peronospora sparsa
5257017 downy mildew Peronospora sparsa
5257018 downy mildew Peronospora sparsa
5257019 downy mildew Peronospora sparsa
5257011 downy mildew Peronospora sparsa
5257012 downy mildew Peronospora sparsa
5257013 downy mildew Peronospora sparsa
5257038 Phytophthora root rot Phytophthora cactorum
5257097 downy mildew Plasmopara viburni
5257098 downy mildew Plasmopara viburni
5257039 late blight Phytophthora infestans
5257040 late blight Phytophthora infestans
5257041 late blight Phytophthora infestans
5257042 late blight Phytophthora infestans
5257043 late blight Phytophthora infestans Phytopthora infestans Lycopersicon esculentum inoc w/tomato & potato strain after 7 days
5257044 late blight Phytophthora infestans Phytopthora infestans Lycopersicon esculentum inoc w/zoozpores & sporangia after 4 days
5257045 late blight Phytophthora infestans Phytopthora infestans Lycopersicon esculentum inoc w/tomato & potato strain after 7 days
5257046 late blight Phytophthora infestans Phytopthora infestans Lycopersicon esculentum inoc w/tomato & potato strain after 7 days
5257047 late blight Phytophthora infestans Phytopthora infestans Lycopersicon esculentum inoc w/zoozpores & sporangia after 4 days
5257048 late blight Phytophthora infestans Phytopthora infestans Lycopersicon esculentum inoc w/zoozpores & sporangia after 4 days
5257049 late blight Phytophthora infestans Phytopthora infestans Lycopersicon esculentum 7 days after inoc.
5257050 late blight Phytophthora infestans Phytopthora infestans Lycopersicon esculentum 7 days after inoc.
5257051 late blight Phytophthora infestans Phytopthora infestans Lycopersicon esculentum 5 days after inoc.
5257052 late blight Phytophthora infestans Phytopthora infestans Lycopersicon esculentum 5 days after inoc.
5257053 late blight Phytophthora infestans Phytopthora infestans Lycopersicon esculentum 5 days after inoc.
5257054 late blight Phytophthora infestans
5257055 late blight Phytophthora infestans
5257056 late blight Phytophthora infestans
5257057 late blight Phytophthora infestans
5257058 late blight Phytophthora infestans Phytopthora infestans Lycopersicon esculentum 5 days after inoc.
5257020 blue mold Peronospora tabacina
5257021 blue mold Peronospora tabacina
5257022 blue mold Peronospora tabacina
5257023 blue mold Peronospora tabacina
5257024 blue mold Peronospora tabacina
5257026 blue mold Peronospora tabacina
5265039 blue mold Peronospora tabacina seed bed
5265040 blue mold Peronospora tabacina seed bed
5265041 blue mold Peronospora tabacina
1501072 Phytophthora root rot Phytophthora cinnamomi Littleleaf disease
1501076 Phytophthora root rot Phytophthora cinnamomi Littleleaf disease
1501077 Phytophthora root rot Phytophthora cinnamomi Littleleaf disease
1501060 Phytophthora root rot Phytophthora cinnamomi Littleleaf disease, sampling tools
1501061 Phytophthora root rot Phytophthora cinnamomi Littleleaf disease; apple trap diagnosis P. cinn..
1501063 Phytophthora root rot Phytophthora cinnamomi Littleleaf disease; crown thinning
1501066 Phytophthora root rot Phytophthora cinnamomi Littleleaf disease
1501068 Phytophthora root rot Phytophthora cinnamomi Littleleaf disease
1501069 Phytophthora root rot Phytophthora cinnamomi Littleleaf disease
1501071 Phytophthora root rot Phytophthora cinnamomi Littleleaf disease; crown thinning
1501067 Phytophthora root rot Phytophthora cinnamomi Littleleaf disease; Shortleaf pine
1501064 Phytophthora root rot Phytophthora cinnamomi Littleleaf disease; crown thinning + healthy
1501070 Phytophthora root rot Phytophthora cinnamomi Littleleaf disease
1501074 Phytophthora root rot Phytophthora cinnamomi Littleleaf disease
1501062 Phytophthora root rot Phytophthora cinnamomi Littleleaf disease; crown with stress cones
5028029 sudden oak death Phytophthora ramorum
5028030 sudden oak death Phytophthora ramorum
5028031 sudden oak death Phytophthora ramorum
5028032 sudden oak death Phytophthora ramorum
5028033 sudden oak death Phytophthora ramorum
5028034 sudden oak death Phytophthora ramorum
5028036 sudden oak death Phytophthora ramorum
5028037 sudden oak death Phytophthora ramorum
5028038 sudden oak death Phytophthora ramorum
5028039 sudden oak death Phytophthora ramorum
5028040 sudden oak death Phytophthora ramorum
5028041 sudden oak death Phytophthora ramorum
5028042 sudden oak death Phytophthora ramorum
5028043 sudden oak death Phytophthora ramorum
5028044 sudden oak death Phytophthora ramorum
5028050 sudden oak death Phytophthora ramorum Ramorum leaf blight symptoms on California laurel
5028051 sudden oak death Phytophthora ramorum Ramorum leaf blight on California laurel
1427067 sudden oak death Phytophthora ramorum bleeding canker
5171025 Phytophthora root rot Phytophthora cinnamomi Young plants showing symptoms after inoculation; Plots were innoculated in opposite corners to look at the effect of soil treatments and soil type on the spread of the disease.
5171026 Phytophthora root rot Phytophthora cinnamomi Young plants showing symptoms after inoculation; Plots were innoculated in opposite corners to look at the effect of soil treatments and soil type on the spread of the disease. Soil tensiometer also included in plots.
5171027 Phytophthora root rot Phytophthora cinnamomi evaluating the effect of soil treatments and soil type on the spread of root rot; soil tensiometer used to measure soil moisture.
5137062 Phytophthora kernoviae Phytophthora kernoviae From Mycol.Res 109, 853-859; Colony types of Phytophthora kernoviae. Figs 1-4. After10 d at 20 xC on CA in complete darkness. Figs 5-6. After 10 d at 20 x on CA with some exposure to light at 7 d for colony measurement. Figs 7-8. After 10 d on CA at ambient room temperature (y23 x) in diurnal light. (Figs 1, 5, isolate P1560; Figs 2, 6-7, isolate P1554; Fig. 3, P1601; Fig. 4, isolate P1608; Fig. 8, isolate P1600).
5137063 Phytophthora kernoviae Phytophthora kernoviae Mycol.Res 109, 853-859; Figs 18-22. Regular, ovoid limoniform sporangia. Figs 23-26. Asymmetrical or ‘mouse-shaped’ sporangia. Bar=10 mm.
5137064 Phytophthora kernoviae Phytophthora kernoviae Mycol.Res 109, 853-859; Representative oogonia, antheridia and thick walled plerotic oospores of Phytophthora kernoviae. Compare oogonia with tapered bases (Figs 10-14, 16) with those without this feature (Figs 9, 15, 17). Bar=10 mm.
3037003 Phytophthora root rot Phytophthora cinnamomi stress crop of cones-little leaf late symptoms
3037014 Phytophthora root rot Phytophthora cinnamomi early stage of disease
1317030 Phytophthora root and crown rots Phytophthora spp.
1317029 Phytophthora root and crown rots Phytophthora spp. Pods of Theobroma cacao in central Costa Rica display symptoms of the fungal disease black pod. This disease causes pods to rot on the cacao tree during the last stages of ripening.
1321090 late blight Phytophthora infestans Potatoes infected with late blight are purplish and shrunken on the outside, corky and rotted inside.
1323025 Root and stem rot Phytophthora sojae A cultured Phytophthora sojae sample (on white pad) is inserted into a naturally resistant soybean seedling.
5110059 Phytophthora kernoviae Phytophthora kernoviae necrosis of rhododendron leaves
5110060 Phytophthora kernoviae Phytophthora kernoviae necrotic lesion on stem
5110061 Phytophthora kernoviae Phytophthora kernoviae necrotic lesion on foliage
5110055 Phytophthora kernoviae Phytophthora kernoviae Single sporangium (foreground) releasing zoospore
5110056 Phytophthora kernoviae Phytophthora kernoviae P. kernoviae sporangium.
5110057 Phytophthora kernoviae Phytophthora kernoviae Scanning electron micrograph, P.kernoviae sporangia
5110025 Phytophthora kernoviae Phytophthora kernoviae wilting
5110023 Phytophthora kernoviae Phytophthora kernoviae lesions of foliage of magnolia
5110020 Phytophthora kernoviae Phytophthora kernoviae external lesion; 14 November 2003
5110021 Phytophthora kernoviae Phytophthora kernoviae lesion on trunk
5110053 Phytophthora kernoviae Phytophthora kernoviae
5110054 Phytophthora kernoviae Phytophthora kernoviae bleeding lesion on trunk
5110024 Phytophthora kernoviae Phytophthora kernoviae wilting of infected rhododendron
5110022 Phytophthora kernoviae Phytophthora kernoviae bleeding lesion on trunk
5041045 sudden oak death Phytophthora ramorum
5041046 sudden oak death Phytophthora ramorum
5041033 sudden oak death Phytophthora ramorum bleeding discoloration and cracks
5041034 sudden oak death Phytophthora ramorum bleeding discoloration and cracks
5041035 sudden oak death Phytophthora ramorum bleeding discoloration
5046053 sudden oak death Phytophthora ramorum infected hillside
5046061 sudden oak death Phytophthora ramorum
5041036 sudden oak death Phytophthora ramorum bleeding and cracking symptoms
5041037 sudden oak death Phytophthora ramorum bleeding cracks
5041038 sudden oak death Phytophthora ramorum
5041039 sudden oak death Phytophthora ramorum bleeding symptom
5041047 sudden oak death Phytophthora ramorum bleeding cracks
5041048 sudden oak death Phytophthora ramorum exposed canker
5041049 sudden oak death Phytophthora ramorum long drips on trunk
5041050 sudden oak death Phytophthora ramorum
5041051 sudden oak death Phytophthora ramorum tree mortality
5076076 Pythium diseases Pythium spp. Damping Off on Snap Bean (Pythium and Rhizoctonia) Collapse of the lower stem area. Caused by Pythium and Rhizoctonia.
5077032 downy mildew Pseudoperonospora cubensis Downy Mildew on Watermelon (Pseudoperonospora cubensis) Small, dark lesions that generally cover the leaf. Severely infected leaves will curl up on themselves.
5077029 downy mildew Peronospora parasitica Downy Mildew on Mustard (Peronospora parasitica) Yellow spots on top and whitish mold on bottom of leaf. Infection usually begins on bottom leaves.
5077052 Phytophthora blight Phytophthora capsici Brown or black area observed on the upper stem or crown area. Whitish mold observed on fruit when fungus is active. Entire plant wil die.powerpo
5076077 Pythium diseases Pythium spp. White, fluffy mass on pods and stems causes a watery rot. Normally associated with hot temperatures and heavy rainfall.
5077016 downy mildew Peronospora parasitica Yellow spots on top of leaf, whitish mold on the bottom of the leaf. Lesions on undersides of leaf are often restricted by veins.
5077065 Phytophthora blight Phytophthora capsici Large area begins to rot. Fruit will often fall away from the calyx. Whitish mold may be present when conditions permit.
5077004 Phytophthora blight Phytophthora capsici Constriction at base of stem. Plant collapses with crown area turning necrotic. Dead plant looks like a "Dead Spider" when it collapses.
5077005 Phytophthora blight Phytophthora capsici sometimes only affects the fruit with a whitish, pasty growth. Plant may not be affected.
5077072 Pythium diseases Pythium spp. Attacks growing point of the root causing a split. Carrot will not form normally.
5076096 Phytophthora blight Phytophthora capsici Initial infection has a sunken area on fruit. Whitish mold observed when fungus is active. May not manifest until fruit has been packed and shipped.
5035037 sudden oak death Phytophthora ramorum
5035038 sudden oak death Phytophthora ramorum
5035040 sudden oak death Phytophthora ramorum
5044024 sudden oak death Phytophthora ramorum ooze
5055035 Phytophthora root rot Phytophthora cinnamomi
5055033 Phytophthora root rot Phytophthora cinnamomi
5055034 Phytophthora root rot Phytophthora cinnamomi
1427079 sudden oak death Phytophthora ramorum P. ramorum zone lines on coast live oak.
1427078 sudden oak death Phytophthora ramorum P. ramorum zone lines on coast live oak.
5038006 sudden oak death Phytophthora ramorum
5043018 sudden oak death Phytophthora ramorum
5043019 sudden oak death Phytophthora ramorum
5043021 sudden oak death Phytophthora ramorum
5043022 sudden oak death Phytophthora ramorum
5043031 sudden oak death Phytophthora ramorum
5043041 sudden oak death Phytophthora ramorum
5027010 downy mildew of potentilla Peronospora potentillae
2151033 sudden oak death Phytophthora ramorum Decontamination of infected material. Truck with all material locked inside. Note band on door lock to show that the truck has remained closed.
2151034 sudden oak death Phytophthora ramorum Decontamination of infected nursery material. All personell working at the decontamination site must disinfect their shoes when exiting.
2151035 sudden oak death Phytophthora ramorum Decontamination of infected material. Sterilizing the site after all infected material has been destroyed.
2151036 sudden oak death Phytophthora ramorum Decontamination of infected material. All soil and plant material is burned and buried in a pit
2151037 sudden oak death Phytophthora ramorum Disinfecting the truck that hauled infected material.
2151038 sudden oak death Phytophthora ramorum Decontamination of infected material. Disinfecting the shoes of workers at the decontamination site.
2151039 sudden oak death Phytophthora ramorum Decontamination of infected material. Placing a tarp down to catch all soil spilled from infected nursry material.
2151040 sudden oak death Phytophthora ramorum Decontamination of infected material. Preparing to destroy (burn) infected material.
2151041 sudden oak death Phytophthora ramorum Decontamination of infected material. Preparing to destroy (burn) infected material.
2151042 sudden oak death Phytophthora ramorum Decontamination of infected material. Burning infected material in a pit.
2151043 sudden oak death Phytophthora ramorum Decontamination of infected material. Preparing a fire in a pit to burn infected material.
2151044 sudden oak death Phytophthora ramorum Decontamination of infected material. All pots holding infected material were washed and dipped in disinfectant and double bagged before being buried at the bottom of a landfill.
2151045 sudden oak death Phytophthora ramorum Decontamination of infected material. Washing and disinfecting pots before double bagging them and burying them in the bottom of a landfill.
2151046 sudden oak death Phytophthora ramorum Decontamination of infected material. Spray unit holding disinfectant.
2151047 sudden oak death Phytophthora ramorum Decontamination of infected material. Roped-off decontamination site.
1427097 sudden oak death Phytophthora ramorum
1293004 Phytophthora root and crown rots Phytophthora spp. Leaf spotting; Suspect leaf spots on Camellia must be tested in the lab to verify the presence of P. ramorum.
1293005 Phytophthora root and crown rots Phytophthora spp. Leaf spotting; Suspect leaf spots on Camellia must be tested in the lab to verify the presence of P. ramorum.
1293006 Phytophthora root and crown rots Phytophthora spp. Leaf spotting; Suspect leaf spots on Camellia must be tested in the lab to verify the presence of P. ramorum.
1400148 Phytophthora root and crown rots Phytophthora spp. Fraser fir Christmas tree killed by phytophthora root disease in poorly drained portion of plantation, North Carolina.
0454036 red stele Phytophthora fragariae Healthy root system of young strawberry runner, not affected by Phytophthora fragariae, showing normal lateral root development.
0454037 red stele Phytophthora fragariae Longitudinal section of roots of strawberry plants showing typical red-core symptoms caused by Phytophthora fragariae.
1371016 Phytophthora root and crown rot Phytophthora cambivora Necrosis on the roots. Story, Germany
1427100 sudden oak death Phytophthora ramorum Oak firewood for sale in Santa Clara, CA.
1427108 sudden oak death Phytophthora ramorum Oak firewood for sale in Santa Clara, CA
1427076 sudden oak death Phytophthora ramorum Coast live oak dying from P. ramorum infection.
1427055 sudden oak death Phytophthora ramorum P. ramorum zone lines on coast live oak.
1427056 sudden oak death Phytophthora ramorum Zone lines of P. ramorum on coast live oak.
1427057 sudden oak death Phytophthora ramorum Cankers and zone lines on coast live oak at China Camp State Park in California.
1427058 sudden oak death Phytophthora ramorum P. ramorum zone lines on coast live oak.
1427059 sudden oak death Phytophthora ramorum P. ramorum zone lines on coast live oak.
1427060 sudden oak death Phytophthora ramorum P. ramorum zone lines on coast live oak.
1427061 sudden oak death Phytophthora ramorum Bleeding from P. ramorum canker on coast live oak.
1427082 sudden oak death Phytophthora ramorum Coast live oak mortality at China Camp State Park, CA.
1427084 sudden oak death Phytophthora ramorum Symptoms of P. ramorum on huckleberry.
1427085 sudden oak death Phytophthora ramorum Bleeding on bark surface of coast live oak, caused by P. ramorum.
1427104 sudden oak death Phytophthora ramorum Zone lines of P. ramorum on coast live oak.
1427029 sudden oak death Phytophthora ramorum Jennifer Juzwik in the foreground.; China Camp State Park, California
1427106 sudden oak death Phytophthora ramorum Zone lines of P. ramorum on coast live oak.
1427111 sudden oak death Phytophthora ramorum This leaf was confirmed as positive for P. ramorum by Jenny Davidson.
1427087 sudden oak death Phytophthora ramorum P. ramorum symptoms on Rhododendron. Leaf was confirmed as infected with P. ramorum by Jenny Davidson.
1427088 sudden oak death Phytophthora ramorum P. ramorum symptoms on Rhododendron. Upper leaf was confirmed as infected by Jenny Davidson.
1137033 Phytophthora root disease of Port Orford cedar Phytophthora lateralis Stain from POC root disease and galleries of the bark beetle Phleosinus sequoiae Hopkins on the Smith River
1234221 downy mildew Peronospora manshurica
1137031 Phytophthora root disease of Port Orford cedar Phytophthora lateralis Dead and Dying cedars on Smith River
1442113 Pythium diseases Pythium spp.
0745020 Phytophthora root rot Phytophthora cinnamomi typical soil profile of susceptible site
1436126 downy mildew Peronospora parasitica
1436159 Pythium diseases Pythium spp. to seedling plant caused primarily by species of the soil-borne fungi Pythium and Rhizoctonia
1436098 downy mildew Plasmopara viticola
1427024 sudden oak death Phytophthora ramorum China Camp State Park, California
1427025 sudden oak death Phytophthora ramorum China Camp State Park, California
1427026 sudden oak death Phytophthora ramorum China Camp State Park, California
1427027 sudden oak death Phytophthora ramorum China Camp State Park, California
1427062 sudden oak death Phytophthora ramorum Showing Hypoxylon thouarsianum, a sapwood decay fungus that is also commonly isolated from Sudden Oak Death - affected oak trees, although it is also found on trees not affected by SOD. The presence of the half-dome-shaped fruiting bodies are indicative of advanced stages of SOD. Newly formed fruiting bodies are olive greenish or shiny black and release powdery green spores upon contact. Older fruiting bodies are dull black.
1427063 sudden oak death Phytophthora ramorum Showing Hypoxylon thouarsianum, a sapwood decay fungus that is also commonly isolated from Sudden Oak Death - affected oak trees, although it is also found on trees not affected by SOD. The presence of the half-dome-shaped fruiting bodies are indicative of advanced stages of SOD. Newly formed fruiting bodies are olive greenish or shiny black and release powdery green spores upon contact. Older fruiting bodies are dull black.
1427031 sudden oak death Phytophthora ramorum zone lines
1427032 sudden oak death Phytophthora ramorum zone lines
1427007 sudden oak death Phytophthora ramorum
1427008 sudden oak death Phytophthora ramorum
1427009 sudden oak death Phytophthora ramorum
0027061 blue mold Peronospora tabacina
4823082 Phytophthora root rot Phytophthora cinnamomi Resin caked roots of infected seedlings in the field.
4823083 Phytophthora root rot Phytophthora cinnamomi Resin-soaked tap root of seedling infected during its first year in the field.
4823086 Phytophthora root rot Phytophthora cinnamomi Healthy tree (left), infected tree (right).
4823087 Phytophthora root rot Phytophthora cinnamomi Yellowing foliage of infected tree.
4823088 Phytophthora root rot Phytophthora cinnamomi 13-year old trees: Fading tree (left), dead tree (center), healthy treee (right).
4823089 Phytophthora root rot Phytophthora cinnamomi Resin soaked tissue.
4823077 Phytophthora root rot Phytophthora cinnamomi Mortality of first-year seedlings in Munson Forest Nursery, Florida, USA
4823078 Phytophthora root rot Phytophthora cinnamomi Roots of infected nursery seedlings. Note the lack of short lateral roots and presence of black, necrotic and sloughing cortical tissues.
4824086 Pythium diseases Pythium spp. Scorched leaves of infected seedlings.
4824082 Phytophthora root and crown rots Phytophthora spp. Infected roots growing in poorly drained nursery beds.
4823080 Phytophthora root rot Phytophthora cinnamomi Poor seed bed drainage can increase infection risk.
4822081 Phytophthora basal canker Phytophthora palmivora diagnostic culture from infected tree
0745021 Phytophthora root rot Phytophthora cinnamomi typical soil profile of susceptible site

Page: