| 1574300 |
black Sigatoka disease |
Mycosphaerella fijiensis |
Lesions caused by black Sigatoka disease. |
| 1574301 |
black Sigatoka disease |
Mycosphaerella fijiensis |
Lesions caused by black Sigatoka disease. |
| 1574298 |
black Sigatoka disease |
Mycosphaerella fijiensis |
|
| 1574299 |
black Sigatoka disease |
Mycosphaerella fijiensis |
|
| 1574297 |
black Sigatoka disease |
Mycosphaerella fijiensis |
Lesions caused by black Sigatoka disease. |
| 1574119 |
mosaic viruses (general) |
|
|
| 1574120 |
mosaic viruses (general) |
|
Close up of fruit symptoms on yellow summer squash. |
| 1574118 |
mosaic viruses (general) |
|
Severe leaf puckering is typically associated with Zucchini Yellow Mosaic Virus. |
| 1573925 |
mosaic viruses (general) |
|
Close up of symptomatic fruit. Only 1% of fruit were affected in the field. Cultivar = Big Max. September 1997 |
| 1574055 |
mosaic viruses (general) |
|
Fruit of variety Big Max showing typical symptoms of mosaic virus infection. September 1997 |
| 1574000 |
anthracnose |
Colletotrichum orbiculare |
Fruit lesions. September 1997 |
| 1573999 |
anthracnose |
Colletotrichum orbiculare |
Fruit lesions. September 1997 |
| 1574104 |
powdery mildew |
Podosphaera xanthii |
Squash powdery mildew fungicide efficacy trial. Note the differences in color among plots. Darker green indicates better control of the disease. October 1997 |
| 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 |
| 1574097 |
powdery mildew |
Podosphaera xanthii |
Powdery mildew on main stem of squash plant. October 1997 |
| 1574096 |
powdery mildew |
Podosphaera xanthii |
Powdery mildew affects stems and leaves. October 1997 |
| 1574095 |
powdery mildew |
Podosphaera xanthii |
White powdery growth on leaf surface. October 1997 |
| 1574092 |
powdery mildew |
Podosphaera xanthii |
Research plots for testing fungicide efficacy against powdery mildew. Notice the color different among plots. September 1997 |
| 1574061 |
mosaic viruses (general) |
|
Severely distorted foliage caused by mosaic virus infection. September 1997 |
| 1574063 |
mosaic viruses (general) |
|
Severely distorted foliage caused by mosaic virus infection. September 1997 |
| 1574064 |
mosaic viruses (general) |
|
Severely distorted foliage caused by mosaic virus infection. September 1997 |
| 1574065 |
mosaic viruses (general) |
|
Severely distorted foliage caused by mosaic virus infection. September 1997 |
| 1574062 |
mosaic viruses (general) |
|
Severely distorted foliage caused by mosaic virus infection. September 1997 |
| 1574060 |
powdery mildew |
Podosphaera xanthii |
Powdery mildew on peduncle. September 1997 |
| 1574059 |
powdery mildew |
Podosphaera xanthii |
Severe powdery mildew in non-treated research plots. September 1997 |
| 1574057 |
downy mildew |
Pseudoperonospora cubensis |
Underside of leaf; top is downy mildew, bottom is powdery mildew. September 1997 |
| 1574056 |
powdery mildew |
Podosphaera xanthii |
Underside of leaf; top is downy mildew, bottom is powdery mildew. September 1997 |
| 1574043 |
mosaic viruses (general) |
|
Lumpy, distorted fruit is caused by mosaic viruses such as Zucchini Yellow Mosaic and Watermelon Mosaic viruses. September 1997 |
| 1574044 |
mosaic viruses (general) |
|
Immature pumpkin fruit. Lumpy, distorted fruit is caused by mosaic viruses such as Zucchini Yellow Mosaic and Watermelon Mosaic viruses. September 1997 |
| 1574042 |
mosaic viruses (general) |
|
Shoestringing of leaves or leaf stapping is a diagnostic symptom of cucurbit mosaic viruses. September 1997 |
| 1574040 |
mosaic viruses (general) |
|
Immature fruit with orange, raised areas. September 1997 |
| 1574021 |
powdery mildew |
Podosphaera xanthii |
Close-up of powdery mildew on pumpkin peduncle. The disease causes discoloration and early drying of peduncle tissue. 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 |
| 1574027 |
powdery mildew |
Podosphaera xanthii |
Overall view with effective treatment in foreground. White patches are plots with severe powdery mildew. September 1997 |
| 1574026 |
powdery mildew |
Podosphaera xanthii |
Myclobutanil (Nova) treated plot. See 1574024 for comparison to non-treated plot. September 1997 |
| 1574025 |
powdery mildew |
Podosphaera xanthii |
Non-treated research plot with severe mildew. September 1997 |
| 1574024 |
powdery mildew |
Podosphaera xanthii |
Non-treated research plot with severe mildew. September 1997 |
| 1574022 |
powdery mildew |
Podosphaera xanthii |
Close-up of powdery mildew on pumpkin peduncle. The disease causes discoloration and early drying of peduncle tissue. Note that the fungus does not colonize mature fruit. September 1997 |
| 1574023 |
powdery mildew |
Podosphaera xanthii |
Pumpkin leaf completely colonized by powdery mildew. September 1997 |
| 1573971 |
phlox powdery mildew |
Erysiphe cichoracearum |
Single diseased leaf entirely covered by the sporulating fungus. September 1997 |
| 1573969 |
phlox powdery mildew |
Erysiphe cichoracearum |
September 1997 |
| 1573970 |
phlox powdery mildew |
Erysiphe cichoracearum |
Single diseased leaf. September 1997 |
| 1573968 |
phlox powdery mildew |
Erysiphe cichoracearum |
Single diseased leaf. September 1997 |
| 1573967 |
phlox powdery mildew |
Erysiphe cichoracearum |
September 1997 |
| 1573941 |
dry bean rust |
Uromyces appendiculatus |
Close-up of the underside of a diseased leaf. September 1997 |
| 1573942 |
dry bean rust |
Uromyces appendiculatus |
Close-up of the underside of a diseased leaf. September 1997 |
| 1573937 |
Phoma blights |
Phoma spp. |
Close-up of diseased fruit. September 1997 |
| 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 |
| 1573924 |
mosaic viruses (general) |
|
Close up of symptomatic fruit. Only 1% of fruit were affected in the field. September 1997 |
| 1573923 |
mosaic viruses (general) |
|
Close up of symptomatic fruit. Only 1% of fruit were affected in the field. September 1997 |
| 1573917 |
mosaic viruses (general) |
|
Symptomatic pumpkin leaf. September 1997 |
| 1573918 |
mosaic viruses (general) |
|
Symptomatic pumpkin leaf. September 1997 |
| 1573901 |
powdery mildew |
Leveillula taurica |
Diseased foliage with several nearing maturity. September 1997 |
| 1573900 |
powdery mildew |
Leveillula taurica |
Diseased leaves and fruit. September 1997 |
| 1573898 |
powdery mildew |
Leveillula taurica |
Close up of diseased leaf. September 1997 |
| 1573899 |
powdery mildew |
Leveillula taurica |
Close up of mildewed leaves and fruit. September 1997 |
| 1573883 |
dry bean rust |
Uromyces appendiculatus |
Close up of diseased leaf. August 1997 |
| 1573884 |
dry bean rust |
Uromyces appendiculatus |
Close up of underside of diseased leaf. August 1997 |
| 1573882 |
dry bean rust |
Uromyces appendiculatus |
Diseased foliage. August 1997 |
| 1573859 |
early blight |
Alternaria solani |
Close up of blighted stems. September 1997 |
| 1573856 |
early blight |
Alternaria solani |
Close up of diseased leaves. September 1997 |
| 1573857 |
early blight |
Alternaria solani |
Close up of blighted leaves. September 1997 |
| 1573858 |
early blight |
Alternaria solani |
Close up of blighted leaves. September 1997 |
| 1573853 |
early blight |
Alternaria solani |
Several diseased leaves. September 1997 |
| 1573854 |
early blight |
Alternaria solani |
Close up of diseased leaf. September 1997 |
| 1573855 |
early blight |
Alternaria solani |
Close up of diseased leaves. September 1997 |
| 1573851 |
early blight |
Alternaria solani |
Close up of leaf with initial symptoms. September 1997 |
| 1573852 |
early blight |
Alternaria solani |
Close up of blighted leaf. September 1997 |
| 1573849 |
early blight |
Alternaria solani |
diseased plant. September 1997 |
| 1573850 |
early blight |
Alternaria solani |
Diseased plants and fruit. September 1997 |
| 1573847 |
mosaic viruses (general) |
|
Close up of symptomatic leaf. September 1997 |
| 1573848 |
Tomato Ringspot Virus |
Nepovirus ToRSV |
Close up of symptomatic leaf. September 1997 |
| 1573846 |
mosaic viruses (general) |
|
Symptomatic leaves. September 1997 |
| 1573845 |
late blight |
Phytophthora infestans |
close up of diseased leaves. September 1997 |
| 1573836 |
powdery mildew |
Podosphaera xanthii |
Close up of diseased squash leaf. The disease causes white powdery lesions on the leaf upperside and yellow spots are caused by the same type of lesion on the leaf underside. August 1997 |
| 1573834 |
Cercospora leaf spot |
Cercospora citrullina |
Close up of diseased leaf - underside. August 1997 |
| 1573835 |
Cercospora leaf spot |
Cercospora citrullina |
Close up of diseased leaf. 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 |
| 1573816 |
Cercospora leaf spot |
Cercospora citrullina |
Foliage with low level of Cercospora leaf spot (see leaf in top center of frame). August 1997 |
| 1573815 |
Cercospora leaf spot |
Cercospora citrullina |
Close up of diseased leaf. August 1997 |
| 1573814 |
Cercospora leaf spot |
Cercospora citrullina |
Close up of diseased leaf. 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 |
| 1573748 |
anthracnose |
Colletotrichum orbiculare |
Anthracnose lesions have a characteristic "shot hole" appearance. August 1997 |
| 1573749 |
anthracnose |
Colletotrichum orbiculare |
Anthracnose lesions have a characteristic "shot hole" appearance. August 1997 |
| 1573746 |
anthracnose |
Colletotrichum orbiculare |
Anthracnose lesions have a characteristic "shot hole" appearance once they've reached a certain size. August 1997 |
| 1573747 |
anthracnose |
Colletotrichum orbiculare |
Anthracnose lesions have a characteristic "shot hole" appearance once they've reached a certain size. August 1997 |
| 1573745 |
anthracnose |
Colletotrichum orbiculare |
Anthracnose lesions have a characteristic "shot hole" appearance once they've reached a certain size. August 1997 |
| 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 |
| 1573715 |
mosaic viruses (general) |
|
Symptomatic fruit on the vine. August 1997 |
| 1573713 |
mosaic viruses (general) |
|
Symptomatic fruit on the vine. August 1997 |
| 1573714 |
mosaic viruses (general) |
|
Symptomatic fruit on the vine. 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 |
| 1573666 |
mosaic viruses (general) |
|
Shoestringing symptom on diseased squash plant. Watermelon Mosaic Virus and Zucchini Yellow Mosaic Virus confirmed by Agdia screen. August 1997 |
| 1573661 |
mosaic viruses (general) |
|
Diseased squash plant in field. Note symptoms on fruit and youngest leaves. Watermelon Mosaic Virus and Zucchini Yellow Mosaic Virus were confirmedby Agdia. August 1997 |
| 1573660 |
mosaic viruses (general) |
|
Close-up of symptomatic squash leaf. Watermelon Mosaic Virus and Zucchini Yellow Mosaic Virus were confirmed using Agdia screen. August 1997 |
| 1573662 |
mosaic viruses (general) |
|
Diseased squash fruit in the field. Watermelon Mosaic Virus and Zucchini Yellow Mosaic Virus confirmed by Agdia screen. August 1997 |
| 1573657 |
mosaic viruses (general) |
|
Close-up of symptomatic squash fruit; Agdia confirmed Watermelon Mosaic Virus and Zucchini Yellow Mosaic Virus. August 1997 |
| 1573655 |
mosaic viruses (general) |
|
Close-up of shoe-string leaf. Agdia confirmed Watermelon Mosaic Virus and Zucchini Yellow Mosaic Virus). August 1997 |
| 1573656 |
mosaic viruses (general) |
|
Close-up of symptomatic leaf; Agdia confirmed Zucchini Yellow Mosaic Virus and Watermelon Mosaic Virus. August 1997 |
| 1573512 |
anthracnose |
Colletotrichum orbiculare |
Close-up of individual anthracnose lesion. Dark flecks in the lesion are setae of Colletotrichum orbiculare. July 1997 |
| 1573509 |
anthracnose |
Colletotrichum orbiculare |
Dark, hair-like structures are setae of Colletotrichum orbiculare as seen at high magnification (200X), July 1997 |
| 1573423 |
brown spot |
Alternaria alternata |
Secondary organisms will colonize injured tissue following chilling injury. July 1997 |
| 1573677 |
powdery mildew |
Podosphaera xanthii |
Close up of diseased leaf. White spots are the sporulating fungus. Yellow spots have corresponding fungal growth on the underside of the leaf. August 1997 |
| 1573684 |
mosaic viruses (general) |
|
Close up of affected leaf. August 1997 |
| 1573665 |
mosaic viruses (general) |
|
Close up of affected squash leaves in the field. August 1997 |
| 1573664 |
mosaic viruses (general) |
|
Close up of affected squash leaf in the field. August 1997 |
| 1573663 |
mosaic viruses (general) |
|
Close up of affected squash leaf in the field. August 1997 |
| 1573659 |
mosaic viruses (general) |
|
Close-up of affected squash leaves. August 1997 |
| 1573178 |
powdery mildew |
Erysiphe pisi |
Powdery mildew on garden pea. June 1997 |
| 1573176 |
powdery mildew |
Erysiphe pisi |
Powdery mildew with cleistotecia on pea. June 1997 |
| 1573116 |
Septoria leaf spot of wheat |
Septoria tritici |
Septoria tritici blotch on wheat. May 1997 |
| 1573115 |
Septoria leaf spot of wheat |
Septoria tritici |
Septoria tritici blotch on wheat. May 1997 |
| 1573114 |
wheat leaf rust |
Puccinia recondita |
Leaf rust on wheat. May 1997 |
| 1573112 |
wheat leaf rust |
Puccinia recondita |
Leaf rust on wheat. May 1997 |
| 1573111 |
powdery mildew |
Blumeria graminis |
Powdery mildew on wheat. Note the tiny black cleistothecia nested inside some of the patches of mycelium. May 1997 |
| 1573110 |
powdery mildew |
Blumeria graminis |
Powdery mildew wheat. May 1997 |
| 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 |
| 1573011 |
strawberry leaf spot |
Mycosphaerella fragariae |
Advanced stages of Ramularia leaf spot. May 1997 |
| 1573010 |
strawberry leaf spot |
Mycosphaerella fragariae |
Early infection of strawberry by Ramularia leaf spot. May 1997 |
| 1573009 |
strawberry leaf spot |
Mycosphaerella fragariae |
Severe infection of strawberry by leaf spot. May 1997 |
| 1573008 |
strawberry leaf spot |
Mycosphaerella fragariae |
Strawberry Ramularia early stages |
| 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 |
| 1572868 |
black spot |
Alternaria brassicicola |
Chinese cabbage leaf showing many lesions caused by Alternaria brassicicola. April 1997? |
| 1572867 |
black spot |
Alternaria brassicicola |
Chinese cabbage leaf showing many lesions caused by Alternaria brassicicola. April 1997? |
| 1572866 |
black spot |
Alternaria brassicicola |
Chinese cabbage leaf showing many young lesions caused by Alternaria brassicicola. April 1997? |
| 1572865 |
black spot |
Alternaria brassicicola |
Chinese cabbage plants showing extensive leaf spotting caused by Alternaria brassicicola. April 1997? |
| 1572864 |
black spot |
Alternaria brassicicola |
Chinese cabbage leaf showing many lesions caused by Alternaria brassicicola. April 1997? |
| 1572863 |
black spot |
Alternaria brassicicola |
Chinese cabbage leaf showing many lesions caused by Alternaria brassicicola. April 1997? |
| 1572860 |
black spot |
Alternaria brassicicola |
Chinese cabbage leaf showing many lesions caused by Alternaria brassicicola. April 1997 |
| 1572819 |
anthracnose |
Colletotrichum fragariae |
Anthracnose fruit rot (black spot) can be caused by Colletotrichum fragariae, C. acutatum, C. dematium and C. gloeosporoides. April 1997?? |
| 1572815 |
anthracnose |
Colletotrichum acutatum |
Anthracnose fruit rot (black spot) can be caused by Colletotrichum fragariae, C. acutatum, C. dematium and C. gloeosporoides. April 1997 |
| 1572816 |
anthracnose |
Colletotrichum fragariae |
Anthracnose fruit rot (black spot) can be caused by Colletotrichum fragariae, C. acutatum, C. dematium and C. gloeosporoides. April 1997? |
| 1572817 |
anthracnose |
Colletotrichum fragariae |
Anthracnose fruit rot (black spot) can be caused by Colletotrichum fragariae, C. acutatum, C. dematium and C. gloeosporoides. April 1997? |
| 1572818 |
anthracnose |
Colletotrichum fragariae |
Anthracnose fruit rot (black spot) can be caused by Colletotrichum fragariae, C. acutatum, C. dematium and C. gloeosporoides. April 1997? |
| 1572810 |
anthracnose |
Colletotrichum acutatum |
Cross section through crown tissue and roots of mature strawberry plant showing typical symptoms of anthracnose crown and root rot which is caused by Colletotrichum fragarieae, C. acutatum and C. gloeosporioides. April 1997? |
| 1572808 |
anthracnose |
Colletotrichum acutatum |
Cross section through crown tissue and roots of mature strawberry plant showing typical symptoms of anthracnose crown and root rot which is caused by Colletotrichum fragarieae, C. acutatum and C. gloeosporioides. April 1997 |
| 1572809 |
anthracnose |
Colletotrichum acutatum |
Cross section through crown tissue and roots of mature strawberry plant showing typical symptoms of anthracnose crown and root rot which is caused by Colletotrichum fragarieae, C. acutatum and C. gloeosporioides. April 1997? |
| 1572799 |
strawberry leaf spot |
Mycosphaerella fragariae |
Symptoms of leaf spot on foliage. April 1997 |
| 1573031 |
angular leaf spot of strawberry |
Xanthomonas fragariae |
|
| 1573032 |
angular leaf spot of strawberry |
Xanthomonas fragariae |
|
| 1573033 |
angular leaf spot of strawberry |
Xanthomonas fragariae |
|
| 1573034 |
angular leaf spot of strawberry |
Xanthomonas fragariae |
|
| 1573035 |
angular leaf spot of strawberry |
Xanthomonas fragariae |
|
| 1573029 |
angular leaf spot of strawberry |
Xanthomonas fragariae |
|
| 1573030 |
angular leaf spot of strawberry |
Xanthomonas fragariae |
|
| 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 |
| 1572546 |
Stemphylium leaf spot |
Stemphylium botryosum |
Symptoms of Stemphylium leaf spot on alfalfa. January 1997 |
| 1572547 |
Stemphylium leaf spot |
Stemphylium botryosum |
Symptoms of Stemphylium leaf spot on alfalfa. January 1997 |
| 1572548 |
Stemphylium leaf spot |
Stemphylium botryosum |
Symptoms of Stemphylium leaf spot on alfalfa. January 1997 |
| 1572549 |
Stemphylium leaf spot |
Stemphylium botryosum |
Symptoms of Stemphylium leaf spot on alfalfa. January 1997 |
| 1572550 |
Stemphylium leaf spot |
Stemphylium botryosum |
Symptoms of Stemphylium leaf spot on alfalfa. January 1997 |
| 1572552 |
Stemphylium leaf spot |
Stemphylium botryosum |
Symptoms of Stemphylium leaf spot on alfalfa. January 1997 |
| 1572443 |
mosaic viruses (general) |
|
Cantaloupe foliage distorted by mosaic virus/es. October 1996 |
| 1572342 |
rose rust |
Phragmidium mucronatum |
Rose rust caused by Phragmidium mucronatum. July 1996 |
| 1572341 |
rose rust |
Phragmidium mucronatum |
Rose rust caused by Phragmidium mucronatum. July 1996 |
| 1572340 |
rose rust |
Phragmidium mucronatum |
Rose rust caused by Phragmidium mucronatum. July 1996 |
| 1572312 |
Stemphylium leaf blight and stalk rot |
Stemphylium vesicarium |
Onion umbel stalk showing a lesion caused by Stemphylium vesicarium. Note the concentric rings. July 1996 |
| 1572311 |
Stemphylium leaf blight and stalk rot |
Stemphylium vesicarium |
Onion umbel stalk showing a lesion caused by Stemphylium vesicarium. Note the concentric rings. July 1996 |
| 1572308 |
Stemphylium leaf blight and stalk rot |
Stemphylium vesicarium |
Onion umbel stalk showing a lesion caused by Stemphylium vesicarium. Note the concentric rings. July 1996 |
| 1572176 |
powdery mildew |
Podosphaera fuliginea |
Chlorotic cantaloupe leaves showing almost complete colonization by powdery mildew. June 1996 |
| 1572175 |
powdery mildew |
Podosphaera fuliginea |
Cantaloupe leaf showing many powdery mildew lesions. June 1996 |
| 1572174 |
powdery mildew |
Podosphaera fuliginea |
Cantaloupe leaf showing many powdery mildew lesions. June 1996 |
| 1572172 |
powdery mildew |
Podosphaera fuliginea |
Underside of cantaloupe leaf showing many powdery mildew lesions. June 1996 |
| 1572171 |
powdery mildew |
Podosphaera fuliginea |
Healthy leaf (left) among severely infected leaves. June 1996 |
| 1572099 |
powdery mildew |
Podosphaera fuliginea |
Powdery mildew outbreak in watermelon field. Note the chlorotic area near the center of the frame where the disease is prevalent. May 1996 |
| 1572017 |
Stemphylium leaf blight and stalk rot |
Stemphylium vesicarium |
|
| 1572015 |
Stemphylium leaf blight and stalk rot |
Stemphylium vesicarium |
|
| 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 |
| 1570891 |
Alternaria black molds / stem cankers |
Alternaria spp. |
Alternaria as secondary invader of kale stem tissue. Primary cause not known. November 1994 |
| 1570890 |
Alternaria black molds / stem cankers |
Alternaria spp. |
Alternaria as a secondary invader of kale stem tissue. Primary cause not known. November 1994 |
| 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 |
| 1571070 |
downy mildew |
Peronospora destructor |
The primary disease is downy mildew. However, some Stemphylium leaf blight is also present. March 1995 |
| 1570866 |
Stemphylium leaf blight and stalk rot |
Stemphylium vesicarium |
Stemphylium leaf blight on onion; March 1995 |
| 1571448 |
powdery mildew |
Podosphaera xanthii |
Powdery mildew lesions caused by Podosphaera xanthii. July 1995 |
| 1571367 |
powdery mildew |
Podosphaera xanthii |
Watermelon leaf showing an even distribution of powdery mildew (Podosphaera xanthii) over the entire leaf surface. June 1995 |
| 1571371 |
powdery mildew |
Podosphaera xanthii |
White sporulation of Podosphaera xanthii on cantaloupe leaves. June 1995 |
| 1571441 |
powdery mildew |
Podosphaera xanthii |
Powdery mildew lesions caused by Podosphaera xanthii. July 1995 |
| 1571442 |
powdery mildew |
Podosphaera xanthii |
Powdery mildew lesions caused by Podosphaera xanthii. July 1995 |
| 1571450 |
powdery mildew |
Podosphaera xanthii |
Powdery mildew lesions caused by Podosphaera xanthii. July 1995 |
| 1571447 |
powdery mildew |
Podosphaera xanthii |
Powdery mildew lesions caused by Podosphaera xanthii. July 1995 |
| 1571452 |
powdery mildew |
Podosphaera xanthii |
Powdery mildew lesions caused by Podosphaera xanthii. July 1995 |
| 1571444 |
powdery mildew |
Podosphaera xanthii |
Powdery mildew lesions caused by Podosphaera xanthii. July 1995 |
| 1571438 |
powdery mildew |
Podosphaera xanthii |
Powdery mildew lesions caused by Podosphaera xanthii. July 1995 |
| 1571440 |
powdery mildew |
Podosphaera xanthii |
Powdery mildew lesions caused by Podosphaera xanthii nearly cover the entire leaf surface. July 1995 |
| 1571179 |
mosaic viruses (general) |
|
Typical symptoms of mosaic virus on cantaloupe. Several mosaic viruses can infect cantaloupe. April 1995 |
| 1571180 |
mosaic viruses (general) |
|
Typical symptoms of mosaic virus on cantaloupe. Several mosaic viruses can infect cantaloupe. April 1995 |
| 1571181 |
mosaic viruses (general) |
|
Typical symptoms of mosaic virus on cantaloupe. Several mosaic viruses can infect cantaloupe. April 1995 |
| 1571188 |
mosaic viruses (general) |
|
Common mosaic viruses of cucurbits include Zucchini Yellow Mosaic, Watermelon Mosaic, Papaya Ringspot and Cucumber mosaic. May 1995This image is of a cantaloupe plant. |
| 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 |
| 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. |
| 1571085 |
powdery mildew |
Erysiphe betae |
Sugar beet leaf showing powdery mildew caused by Erysiphe polygoni. March 1995 |
| 1571087 |
powdery mildew |
Erysiphe betae |
Sugar beet leaf showing powdery mildew caused by Erysiphe polygoni. Note the chlorosis associated with the disease. March 1995 |
| 1571088 |
powdery mildew |
Erysiphe betae |
Sugar beet leaf showing powdery mildew caused by Erysiphe polygoni. Note that stems are also affected. March 1995 |
| 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 |
| 1571044 |
late blight |
Phytophthora infestans |
|
| 1571045 |
late blight |
Phytophthora infestans |
|
| 1571047 |
late blight |
Phytophthora infestans |
|
| 1571048 |
late blight |
Phytophthora infestans |
|
| 1571050 |
late blight |
Phytophthora infestans |
|
| 1571051 |
late blight |
Phytophthora infestans |
|
| 1571052 |
late blight |
Phytophthora infestans |
|
| 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’. |
| 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 |
