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Peronosporaceae

Kingdom: Chromista
Phylum: Oomycota
Class: Oomycetes
Order: Peronosporales
Family: Peronosporaceae

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Image Subject Name Scientific Name Description
5484090 late blight Phytophthora infestans Late blight symptom, leaf spot, view of upper and lower leaf surfaces.
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
5485740 downy mildew Plasmopara obducens
5485737 downy mildew Plasmopara obducens
5485738 downy mildew Plasmopara obducens
5485739 downy mildew Plasmopara obducens
5479914 downy mildew Plasmopara belbahrii Downy mildew symptoms on upper leaf surface
5479915 downy mildew Plasmopara belbahrii Downy mildew symptoms on upper leaf surface
5479898 late blight Phytophthora infestans leaf spots
5479899 late blight Phytophthora infestans fruit lesions
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
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' 
5479846 downy mildew Plasmopara viticola Sporulation on underside of leafcultivar is 'Buffalo'
5479847 downy mildew Plasmopara viticola Symptoms on underside of leafcultivar is 'Buffalo'
5473575 Root and stem rot Phytophthora sojae Phytophthora root and stem rot
5472854 downy mildew Plasmopara obducens Downy mildew of impatiens caused by Plasmopara obducens.
5472853 Phytophthora root and crown rots Phytophthora spp. Buckeye rot of tomato caused by Phytophthora sp.
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.
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.
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.
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
5021075 Phytophthora root rot Phytophthora cactorum dieback
5021073 Phytophthora root rot Phytophthora cactorum dieback
5021072 Phytophthora root rot Phytophthora cactorum mortality
5435605 leaf blight of taro Phytophthora colocasiae
5435588 downy mildew Peronospora spp.
5435589 downy mildew Peronospora spp.
5435590 downy mildew Peronospora spp.
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.
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.
5035095 sudden oak death Phytophthora ramorum Tanoak dying from Phytophthora ramorum infection
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.
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.
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.
5407877 red stele Phytophthora fragariae Strawberry roots showing the reddish brown stele associated with Phytophthora fragariae (red stele disease)
5021074 Phytophthora root rot Phytophthora cactorum dieback
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
5045047 sudden oak death Phytophthora ramorum Severe impact of Phytophthora ramorum on Pacific madrone
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.
5039013 Phytophthora root and crown rots Phytophthora spp. Leaf symptoms caused by Phytophthora sp. on Rhododendron.
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.
2179038 sudden oak death Phytophthora ramorum
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.
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
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
5389800 downy mildew Peronospora hariotii Angular leaf spots
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
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
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
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
5368391 Phytophthora blight Phytophthora capsici Infected plants with symptoms of dieback and overall stunted growth when compared to plants at right.
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.
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.
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.
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.
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
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.
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
5257014 downy mildew Peronospora sparsa
5223020 downy mildew Peronospora sparsa
5223021 downy mildew Peronospora sparsa
5223018 downy mildew Peronospora sparsa
5223019 downy mildew Peronospora sparsa
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.
5262063 Phytophthora tropicalis Phytophthora tropicalis
5262065 Phytophthora tropicalis Phytophthora tropicalis
5262066 Phytophthora tropicalis Phytophthora tropicalis
5261088 Phytophthora root rot Phytophthora cinnamomi
5261089 Phytophthora root rot Phytophthora cinnamomi
5260092 Phytophthora root rot Phytophthora cinnamomi
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
5257025 blue mold Peronospora tabacina
5257026 blue mold Peronospora tabacina
5257087 late blight Phytophthora infestans
5257089 late blight Phytophthora infestans atypical leaf symptoms
5257091 late blight Phytophthora infestans atypical leaf symptoms
5257094 late blight Phytophthora infestans atypical leaf symptoms atypical
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.
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
5257012 downy mildew Peronospora sparsa
5257013 downy mildew Peronospora sparsa
5257017 downy mildew Peronospora sparsa
5257018 downy mildew Peronospora sparsa
5257038 Phytophthora root rot Phytophthora cactorum
5257069 late blight Phytophthora infestans
5257070 late blight Phytophthora infestans
5257071 late blight Phytophthora infestans
5257072 late blight Phytophthora infestans
5257095 late blight Phytophthora infestans
5257096 late blight Phytophthora infestans
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
5257097 downy mildew Plasmopara viburni
5257098 downy mildew Plasmopara viburni
5257099 downy mildew Plasmopara viburni
5265039 blue mold Peronospora tabacina seed bed
5265040 blue mold Peronospora tabacina seed bed
5265041 blue mold Peronospora tabacina
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
5110059 Phytophthora kernoviae Phytophthora kernoviae necrosis of rhododendron leaves
5110022 Phytophthora kernoviae Phytophthora kernoviae bleeding 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
5110025 Phytophthora kernoviae Phytophthora kernoviae wilting
5046053 sudden oak death Phytophthora ramorum infected hillside
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
5041045 sudden oak death Phytophthora ramorum
5041046 sudden oak death Phytophthora ramorum
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
5044024 sudden oak death Phytophthora ramorum ooze
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

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