| 5486243 |
apple scab |
Venturia inaequalis |
Apple scab on crabapple |
| 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 |
powdery mildew |
Erysiphe cichoracearum |
Single diseased leaf entirely covered by the sporulating fungus. September 1997 |
| 1573969 |
powdery mildew |
Erysiphe cichoracearum |
September 1997 |
| 1573970 |
powdery mildew |
Erysiphe cichoracearum |
Single diseased leaf. September 1997 |
| 1573968 |
powdery mildew |
Erysiphe cichoracearum |
Single diseased leaf. September 1997 |
| 1573967 |
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 |
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