Disease factsheets and articles

If you were a big fan of the pioneering Vegetable MD Online website, much of that content has been moved here. We are in the process of moving over the rest.

• (LIHREC) indicates information from the Long Island Horticultural Research and Extension Center Vegetable Pathology website.
• List also includes some herbs (parsley, basil) and abiotic disorder
• Some content is available as printer-friendly .pdf versions.

 

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General tips on diagnosing plant diseases

 

Diseases and management practices affecting multiple crops

• Phytophthora Blight and Its Management in Cucurbit Crops and Other Vegetables
• Reduced-tillage for Managing Phytophthora Blight and Other Soil-Borne Pathogens
• Biofumigation for Managing Phytophthora Blight and Other Soil-Borne Pathogens
• White Mold and Its Management in Cabbage, Beans, and Other Vegetables
• Diseases of Winter Greens: Downy Mildews, Powdery Mildews, Cladosporium Leaf Spot, and Root Rot
• Table: Fungicides for Cucurbit Crops (.pdf) (click here for Excel version)
• Table: Mobile Fungicides for Managing Three Major Cucurbit Diseases: Powdery Mildew, Downy Mildew, and Phytophthora Blight
• Weeds and Crops Susceptible to Viruses in the Northeast
• Disease-resistant varieties
• Managing Pathogens Inside Seed with Hot Water
• Treatments for Managing Bacterial Pathogens in Vegetable Seed
• Do Rotations Matter within Disease Management Programs?
• Cropping Sequences and Root Health
• On-Farm Soil Bioassays for Assessing Root Pathogens
• General Guidelines for Managing Fungicide Resistance
• When is the Best Time to Apply Fungicides for Foliar Diseases?
• Managing Diseases With Sulfur:  Is There A Role For Burners + Evaporators?
• Organic Management of Vegetable Diseases
• Biopesticides for Organic and Conventional Disease Management in Vegetables
• Copper Fungicides for Organic and Conventional Disease Management in Vegetables
• Minimizing Injury from Copper Fungicides

 

Diseases and management practices affecting specific crops

Arugula

• Downy mildew (LIHREC)
• Powdery mildew (LIHREC)

Asparagus

• Herbicide injury (LIHREC)

Basil

• Basil downy mildew

Beans

• Anthracnose
• Bacterial brown spot
• Bacterial diseases
• Chimera (genetic disorder) (LIHREC)
• Ozone injury (LIHREC)
• Phytophthora blight
• Tomato chlorotic spot virus (TCSV)
• Virus diseases of snap and dry beans

Beets and Swiss Chard

• Alternaria leaf spot
• Bacterial leaf spot
• Cercospora leaf spot
• Cercospora leaf spot (LIHREC)
• Phoma leaf spot and root rot
• Rhizoctonia crown and root rot

Carrots

• Leaf blight diseases
• Powdery mildew (LIHREC)

Celery

• Anthracnose
• Septoria leaf spot (LIHREC)

Corn (sweet)

• Sweet corn diseases and control measures

• Common corn smut (LIHREC)
• Crazy top (LIHREC)
• Holcus spot (LIHREC)
• Northern corn leaf blight (LIHREC)
• Rust (LIHREC)
• Stewart’s wilt (LIHREC)
• Virus diseases of sweet corn

Crucifers (aka brassicas and cole crops)

• Alternaria leaf spot of brassicas
• Alternaria leaf spot on cabbage (LIHREC)
• Bacterial leaf spot on cauliflower (LIHREC)
• Black leg on kale (LIHREC)
• Black rot on Brussels sprouts (LIHREC)
• Black rot on cabbage (LIHREC)
• Black rot on ornamental kale and ornamental cabbage (LIHREC)
• Cabbage chimera (genetic disorder) (LIHREC)
• Clubroot of crucifers
• Clubroot on cabbage and bok choi (LIHREC)
• Diseases of winter greens: downy mildew, Cladosporium leaf spot, Botrytis crown rot and root rot
• Downy mildew on cabbage (LIHREC)
• Downy mildew on seedlings (LIHREC)
• Fusarium yellows of cabbage & related crops
• Fusarium yellows of crucifers (LIHREC)
• Head rot (soft rot) of broccoli (LIHREC)
• Heat stress damage to broccoli heads (LIHREC)
• Powdery mildew (LIHREC)
• Virus diseases of crucifers

Cucurbits

• Table: Fungicides for Cucurbit Crops (.pdf) (click here for Excel version)
• Table: Mobile Fungicides for Managing Three Major Cucurbit Diseases: Powdery Mildew, Downy Mildew, and Phytophthora Blight

• Alternaria (LIHREC)
• Angular leaf spot (LIHREC)
• Anthracnose
• Anthracnose (LIHREC)
• Bacterial leaf spot (renamed Xanthomonas leaf spot) (LIHREC)
• Choanephora fruit rot (LIHREC)
• Downy mildew
• Fusarium crown rot and fruit rot of pumpkin (LIHREC)
• Fusarium fruit rot of other cucurbits (LIHREC)
• Gummy stem blight and black rot (LIHREC)
• Ozone injury (LIHREC)
• Phytophthora blight
• Plectosporium blight (LIHREC)
• Powdery mildew
• Pythium fruit rot (LIHREC)
• Pythium root rot (LIHREC)
• Scab
• Sunscald of pumpkin and winter squash (LIHREC)
• Virus diseases of cucurbits
• White mold on cucurbits (LIHREC)
• Xanthomonas leaf spot (formerly Bacterial leaf spot)

Dill

• Cercosporoid leaf blight (LIHREC)

Eggplant

• Anthracnose (LIHREC)
• Phytophthora blight
• Verticillium wilt (LIHREC)

Garlic

• Anthracnose of garlic scapes (LIHREC)
• Bloat nematode (LIHREC)
• Botrytis neck rot (aka dry rot) (LIHREC)
• Garlic rust (LIHREC)
• Waxy breakdown (LIHREC)

Horseradish

• Cercospora and Alternaria leaf spots (LIHREC)

Lettuce

• Crown girdling (LIHREC)
• Downy mildew (LIHREC)
• Powdery mildew (LIHREC)
• Septoria leaf spot (LIHREC)
• White mold (LIHREC)
• Diseases of winter greens: downy mildew, Cladosporium leaf spot, Botrytis crown rot, and root rot

Onion

• Black mold (LIHREC)
• Stemphylium leaf blight (LIHREC)
• Stemphylium leaf blight (Cornell AgriTech Geneva)

Parsley

• Septoria leaf spot (LIHREC)

Peas

• Powdery mildew (LIHREC)

Peppers

• Anthracnose (LIHREC)
• Bacterial leaf spot (LIHREC)
• Chimera (genetic disorder) (LIHREC)
• Cucumber mosaic virus (CMV) (LIHREC)
• Pythium crown and root rot (LIHREC)
• Phytophthora blight
• Powdery mildew
• Sunscald (LIHREC)
• Tomato chlorotic spot virus (TCSV)
• Tomato spotted wilt virus (TSWV) (LIHREC)
• White mold (LIHREC)

Potatoes

• Detection of potato tuber diseases and defects

• Black dot disease
• Blackleg caused by dickeya (LIHREC)
• Blackleg stem rot and tuber rot caused by Pectobacterium (LIHREC)
• Early blight (LIHREC)
• Fusarium dry rot
• Gray mold (LIHREC)
• Late blight
• Leaf spot caused by Phytophthora nicotianae (LIHREC)
• Ozone injury (LIHREC)
• Potato virus Y (LIHREC)
• Rhizoctonia canker and black scurf
• Scab
• Silver scurf of potato
• Tomato spotted wilt virus (TSWV) (LIHREC)
• Virus and viroid diseases of potato

Spinach

• Downy mildew
• Fusarium root rot (LIHREC)
• Stemphylium leaf spot (LIHREC)
• White rust (LIHREC)
• Diseases of winter greens: downy mildew, Cladosporium leaf spot, and root rot

Tomatoes

• Managing Tomato Diseases Successfully
• Table: Fungicides for Tomatoes (.pdf) (click here for Excel version)
• Table: Fungicides for Managing Bacterial Diseases in Tomato

• Anthracnose (LIHREC)
• Bacterial canker of tomatoes
• Bacterial canker of tomatoes (LIHREC)
• Bacterial speck of tomatoes
• Bacterial speck of tomatoes (LIHREC)
• Blossom-end rot (fruit disorder) (LIHREC)
• Buckeye fruit rot (LIHREC)
• Chimera (genetic disorder) (LIHREC)
• Drought stress (LIHREC)
• Early blight (LIHREC)
• Gray mold (LIHREC)
• Late blight
• Late blight resistant tomato variety evaluations
• Leaf mold
• Ozone injury (LIHREC)
• Phytophthora blight
• Pith necrosis (LIHREC)
• Powdery mildew (LIHREC)
• Septoria leaf spot (LIHREC)
• Stemphylium (aka gray) leaf spot (LIHREC)
• Tomato brown rugose fruit virus
• Tomato chlorotic spot virus (TCSV)
• Tomato spotted wilt virus (LIHREC)
• White mold (timber rot) (LIHREC)
• Zippering (fruit disorder) (LIHREC)