Diagnostic Key:Diseases of Cucurbit Fruits |
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Bacteria Phytoplasma |
Fungi/oomycete
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Angular leaf spot: Fruit |
Fruit symptoms present |
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Symptoms shown on summer squash fruit |
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Brown spots, 1-4 mm in diameter, circular, water-soaked often with raised white center. Leaf symptoms also. | ||||||||||||
Bacterial leaf spot: Fruit |
Fruit symptoms present |
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See symptoms on:
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Brown spots varying greatly in size (up to a half dollar). Can develop into a water soaked rot that leads to fruit collapse. Leaf symptoms also. | ||||||||||||
Anthracnose: Fruit |
Fruit symptoms present |
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Symptoms shown on cucumber fruit |
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Dark brown spots, circular, 2-5 mm, or larger in diameter, sunken with salmon-colored fungal growth under moist conditions or tiny black specks. Spots often develop in storage. Leaf and stem symptoms also. | ||||||||||||
Choanephora fruit rot: Fruit |
Fruit symptoms present |
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See symptoms on:
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Tan, circular spots. Firm dry rot. White fungal growth. On surface side touching moist soil. Uncommon. | ||||||||||||
Fusarium dry rot: Fruit |
Fruit symptoms present |
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See symptoms on:
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Tan, circular spots. Firm dry rot. White fungal growth. On surface side touching moist soil. Uncommon. | ||||||||||||
Gummy stem blight/black rot: Fruit |
Fruit symptoms present |
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Symptoms shown on pumpkin |
See symptoms on:
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Black spots, circular or irregular, can be large. Initially water-soaked, pinkish then turning black. Fruit often collapse due to other rotting organisms. Symptoms often develop in storage. Pycnidia often develop in storage. Pycnidia often develop. Foliar phase called gummy stem blight black rot. | ||||||||||||
Phytophthora fruit rot: Fruit |
Fruit symptoms present |
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Symptoms shown on butternut squash fruit |
See symptoms on:
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Water-soaked or sunken spots. Enlarge to encompass entire fruit. White yeast-like fungal growth. Leaf and stem symptoms also. Localized occurrence. | ||||||||||||
Plectosporium blight: Fruit |
Fruit symptoms present |
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Light tan spots, small spindle-shaped, sunken, dry, scabby. Spots primarily on fruit handles and stems; sometimes on leaves. | ||||||||||||
Pythium Rot: Fruit |
Fruit symptoms present |
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White spots, circular, 1-2 mm in diameter, raised like a rash. Leaf symptoms also | ||||||||||||
Scab: Fruit |
Fruit symptoms present |
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Symptoms shown on pumpkin |
See symptoms on:
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Beige or brown spots, dry and corky, small, circular. Initially sunken; can be raised. Leaf and stem symptoms also. | ||||||||||||
Sclerotinia white mold: Fruit |
Fruit symptoms present |
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Watery, odorless rot. The pathogen produces a white cottony mold with black, hard, pea-like bodies. Develops in field or in storage. Localized occurrence, especially where beans or cabbage were grown. | ||||||||||||
Septoria: Fruit |
Fruit symptoms present |
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Symptoms shown on pumpkin |
See symptoms on:
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White spots, circular, 1-2 mm in diameter, raised like a rash. Leaf symptoms also. | ||||||||||||
Aster yellows: Fruit |
Fruit symptoms present |
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Fruit smaller and lighter in color than normal. Leaf symptoms also. | ||||||||||||
Viruses: Fruit |
Fruit symptoms present |
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See symptoms on:
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Fruit mottled, discolored (e.g. green blotches), distorted, bumpy, malformed. Plant stunted. Leaf symptoms also. | ||||||||||||
Miscellaneous: Fruit |
Fruit symptoms present |
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ALSO SEE:
Diagnostic Key —Cucurbit: Wilt and General Plant Decline and Crown Area
Diagnostic Key —Cucurbit: Diseases of Leaves
