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2022 Midwest Vegetable Guide

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Disease Management Strategies Midwest Veg Guide 2022 49 Summary of Cultural Management Strategies for Disease This table describes several diseases listed by crop. This list is not exhaustive, but represents important Midwest diseases. Also listed are the cultural management options available for each disease. The management options are described in more detail in the text. Note that some pathogens have races. The reaction of a particular race of fungus or bacterium will depend on the cultivar or variety grown. Rotation refers to the number of years that the field should be planted to a different crop. Crop Disease Tillage 1 Seedborne Rotation 2 Resistance Comments Allium garlic, onion, leek Alternaria purple blotch, Botrytis leaf blight 3 Yes 3-4 No Thrips-damaged tissues are more susceptible Aster yellows 1 Yes NE No Seed transmission is low, but possible; transmission from garlic bulb/cloves occurs Botrytis neck rot 2 No 3 No Cure bulbs rapidly and properly and avoid injury to neck Downy mildew 2 Yes 3 Yes Resistance in onion only (limited varieties) Fusarium basal rot 1 No 4 Yes Smut 1 No 3 No Transmitted on sets and transplants White rot 1 No NE No Do not move Allium spp. into quarantine areas of the U.S. (Columbia Basin) Asparagus Cercospora leaf spot and rust NA No NA Yes Remove or burn down ferns in the late fall to reduce inoculum Fusarium crown and root rot NA Yes NA Yes Avoid long harvest periods to maintain vigor Phytophthora crown and spear rot NA No NA No Cruciferous vegetables Alternaria leaf spot 3 Yes 3-4 No Black leg 3 Yes 3-5 Leave 1/4-mile buffer from previously infected fields, delay plant until conditions are dry Black rot 3 Yes 2-3 No Club root NE No 5-7 Yes Club root pathogen survives on some grass, clover, weedy, and other plants, which influences rotation or cover crop selection Downy mildew 3 Yes 2-3 Yes Resistance in broccoli only Fusarium yellows 2 Yes >6 Yes Powdery mildew 3 No 3 Yes Resistance for Brussels sprout and cabbage only, avoid over applying nitrogen and drought Rhizoctonia diseases 3 No NE No Can form disease complex with black leg pathogen for stem canker Sclerotinia stem rot 2 No NE No Very wide host range; rotation for greater than 3 years into grasses, onions, or corn may reduce severe infestations White rust NE Yes 3 Yes Remove crop debris from area after harvest Cucurbits cantaloupe, cucumber, pumpkin, squash, watermelon Alternaria leaf blight 3 No 2 No Angular leaf spot 3 Yes 2 Yes Anthracnose 3 Yes 2 No Race 1 affects mainly cucumber. Race 2 affects mainly watermelon Bacterial fruit blotch 3 Yes 2 No Bacterial leaf and fruit spot 3 Yes 3 No Primarily on pumpkin and winter squash Bacterial wilt 1 No NE No Spread by cucumber beetles Downy mildew 1 No NE Yes Resistant varieties of cucumber and cantaloupe available Fusarium wilt 1 Yes 5-7 Yes Gummy stem blight/black rot 3 Yes 3 No Also affects pumpkin and watermelon Phytophthora blight 2 No >4 No Avoid excess water and rotation with solanaceous crops; good drainage is important. Treating seeds with mefenoxam may prevent seedling death. Plectosporium blight 3 No 3-4 No Primarily on pumpkins; manage like black rot Powdery mildew 2 No 2 Yes Root-knot nematode 2 No >6 No Wide host range will affect rotation choices Viruses (several) 1 No NE No Spread by aphids; plant crops before insect pressure becomes severe

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