Vegetable diseases observed on Long Island
Plus vegetable disorders, herb diseases, fruit diseases (strawberry and blueberry), and some insects plus feeding injury.
Find more vegetable disease information (factsheets, articles, etc.) at the Cornell Vegetables website. Find more strawberry disease information at Kerik Cox’s lab website and at the Cornell Berry Team website.
Click on images in these galleries to view high resolution images.
Arugula
Asparagus
Basil
Beans
- Anthracnose
- Bacterial brown spot
- Chimera (genetic disorder)
- Common blight
- Halo blight
- Ozone injury
- Phytophthora blight
- Rust
- Virus
- White mold
Beets and Swiss Chard
Blueberry
Carrots
Celery
Corn (sweet)
Crucifers (aka brassicas and cole crops)
- Alternaria leaf spot of crucifers
- Alternaria leaf spot on cabbage
- Alternaria leaf spot on kale
- Bacterial leaf spot on cauliflower
- Black leg on kale
- Black rot on Brussels sprouts
- Black rot on cabbage
- Black rot on ornamental kale and ornamental cabbage
- Chimera (genetic disorder)
- Clubroot on cabbage and Bok choy
- Downy mildew on cabbage
- Downy mildew on seedlings
- Fusarium yellows
- Head rot (soft rot) of broccoli
- Heat stress damage to broccoli heads
- Powdery mildew
- Turnip mosaic virus
- White mold
Cucurbits
- Alternaria
- Angular leaf spot
- Anthracnose
- Bacterial wilt
- Bacterial leaf spot (renamed Xanthomonas leaf spot)
- Cercospora leaf spot of Cucumber
- Choanephora fruit rot
- Downy mildew of cucumber and other cucurbit plants (for gardeners)
- Downy mildew: Early symptoms
- Downy mildew: Other symptoms and imitators
- Edema
- Fusarium crown rot and fruit rot of pumpkin
- Fusarium fruit rot of other cucurbits
- Gummy stem blight and black rot
- Herbicide injury
- Ozone injury
- Phytophthora blight
- Plectosporium blight
- Powdery mildew
- Pythium fruit rot
- Pythium root rot
- Scab
- Sunscald of pumpkin and winter squash
- Virus
- White mold on cucurbits
- Xanthomonas leaf spot (formerly Bacterial leaf spot)
Dill
Eggplant
Garlic
- Anthracnose of garlic scapes
- Bloat nematode
- Botrytis neck rot (aka dry rot)
- Garlic rust
- Waxy breakdown
Horseradish
Lettuce
Onion
Parsley
Peas
Peppers
- Anthracnose
- Bacterial leaf spot
- Chimera (genetic disorder)
- Cucumber mosaic virus (CMV)
- Pythium crown and root rot
- Phytophthora blight
- Powdery mildew (Cornell Vegetables)
- Sunscald
- Tomato spotted wilt virus (TSWV)
- White mold
Potatoes
- Black dot
- Blackleg caused by Dickeya
- Blackleg stem rot and tuber rot caused by Pectobacterium
- Early blight
- Gray mold
- Late blight
- Leaf spot caused by Phytophthora nicotianae
- Ozone injury
- Potato virus Y
- Tomato spotted wilt virus (TSWV)
Spinach
Strawberries
- Anthracnose
- Black root rot
- Black seed disease
- Cold injury
- Gray mold
- Leaf spot
- Leather rot
- Phomopsis leaf blight
- Red stele root rot
- Slime mold
Tomatoes
- Anthracnose
- Bacterial canker
- Bacterial speck
- Blossom-end rot (fruit disorder)
- Buckeye fruit rot
- Chimera (genetic disorder)
- Drought stress
- Early blight
- Gray mold
- Late blight
- Late blight ‘imitators’
- Leaf mold
- Ozone injury
- Phytophthora blight
- Pith necrosis
- Powdery mildew
- Septoria leaf spot
- Stemphylium (gray) leaf spot
- Tomato spotted wilt virus
- White mold (timber rot)
- Zippering (fruit disorder)
- Insect feeding injury on tomatoes: Stink bugs, thrips