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2022 Midwest Vegetable Guide

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Leafy Vegetables and Herbs (Non-Brassica) – Diseases 184 Midwest Veg Guide 2022 (sold as MTO). Greenhouse sanitation and good weed control of Aster weeds like dandelion, groundsel, and thistles is important to limit other hosts near the crop. Use a monitoring program to time the release of natural enemies of aphids (see insect section). Keep new lettuce plantings as far as possible with the previous production area. Remove infected transplants and do not plant them out into fields. Prompt destruction of the finished crop with tillage to rapidly breakdown tissue is an important method to prevent disease build-up. Pesticide Insecticides Chicory, Endive, Escarole, Head Lettuce, Leaf Lettuce, Radicchio | For LMV: use aphid-specific insecticides to lower the population without also reducing the population of natural enemies. See insect section. White Mold (Timber Rot, Drop, Stem Rot) of Multiple Crops - Sclerotinia Fungus This soil pathogen is long-lived in the soil, and has a wide host range on broadleaved crops and weeds, including beans, vine crops, lettuce, tomatoes, peppers, and cole crops. It goes by other names in other crops, such as Drop, White Mold, Stem Rot, and Timber Rot. It is more commonly found in greenhouses and high tunnels where humidity and temperatures are high. The fungus often infects flowers, which then drop off and infect the stems that they land on. The stems take on a woody appearance and can split open. On lettuce, the pathogen infects the root crown and heart of the plant, which makes the leaves drop and rot. Inspection of the stems, or lettuce hearts, will reveal small black pellets that are the overwintering body of the pathogen. Non-Pesticide Arugula, Basil, Chicory, Chive, Cilantro, Coriander, Cress, Dill, Endive, Escarole, Fennel, Florence Fennel, Head Lettuce, Lavender, Leaf Lettuce, Marjoram, Oregano, Parsley, Radicchio, Rosemary, Sage, Savory, Spinach, Swiss Chard, Tarragon, Thyme | Avoid fields with a history of the problem. Rotate to a non-broadleaf crop, such as grass grains or sweet corn for >6 years. Prompt destruction of the finished crop with tillage to rapidly breakdown tissue is an important method to prevent disease build-up. Anaerobic soil disinfestation (ASD) is an effective sterilization method for greenhouse and high tunnel soils that contain this pathogen. Pesticide Botran 75W (dichloro-nitroaniline) Endive, Head Lettuce, Leaf Lettuce | Rate depends on crop and application method. Flowable formulations may be available. REI: 12-hour. PHI: 14-day. FRAC 14. Contans WG (5) (Coniothyrium minitans strain CON/M/91-08) Head Lettuce, Leaf Lettuce | 1-6 lbs. per acre. Apply immediately after harvest or 3-4 months before planting. REI: 4-hour. FRAC NC. OMRI-listed. Endura (WG) (boscalid) Head Lettuce, Leaf Lettuce | 8-11 oz. per acre. Suppresses Bottom Rot. REI: 12-hour. PHI: 14- day. FRAC 07. Fontelis (1.67SC) (penthiopyrad) Basil, Chicory, Chive, Cilantro, Coriander, Cress, Dill, Endive, Escarole, Fennel, Florence Fennel, Head Lettuce, Lavender, Leaf Lettuce, Marjoram, Oregano, Parsley, Radicchio, Rosemary, Sage, Savory, Spinach, Swiss Chard, Tarragon, Thyme | 14-24 fl. oz. per acre. REI: 12-hour. PHI: 3-day. FRAC 07. iprodione products (iprodione) Head Lettuce, Leaf Lettuce | 1.5-2 pts. per acre. Formulations of iprodione include Nevado and Rovral. REI: 24-hour. PHI: 14-day. FRAC 02. Kenja 400SC (3.33) (isofetamid) Head Lettuce, Leaf Lettuce | 12.3 fl. oz. per acre. REI: 12-hour. PHI: 14-day. FRAC 07. Luna Sensation (fluopyram, trifloxystrobin) Arugula, Chicory, Cress, Endive, Escarole, Head Lettuce, Leaf Lettuce, Parsley, Radicchio, Spinach | 7.6 fl. oz. per acre. Can be applied as a band over lettuce. REI: 12-hour. PHI: 0-day. FRAC 07, FRAC 11. Merivon (fluxapyroxad, pyraclostrobin) Arugula, Basil, Chicory, Chive, Cilantro, Coriander, Cress, Dill, Endive, Escarole, Fennel, Florence Fennel, Head Lettuce, Lavender, Leaf Lettuce, Marjoram, Oregano, Parsley, Radicchio, Rosemary, Sage, Savory, Spinach, Swiss Chard, Tarragon, Thyme | 8-11 fl. oz. per acre. Suppression only. REI: 12-hour. PHI: 1-day. FRAC 07, FRAC 11. Switch 62.5WG (cyprodinil, fludioxonil) Arugula, Basil, Chicory, Chive, Cilantro, Coriander, Cress, Dill, Endive, Escarole, Fennel, Florence Fennel, Head Lettuce, Lavender, Leaf Lettuce, Marjoram, Oregano, Parsley, Radicchio, Rosemary, Sage, Savory, Spinach, Swiss Chard, Tarragon, Thyme | 11-14 oz. per acre. Powdery mildew suppression only. REI: 12-hour. PHI: 0-day. FRAC 09, FRAC 12. White Rust of Multiple Crops - Albugo Oomycete Non-Pesticide Arugula, Cress, Spinach | Use disease-free seed and transplants. Hot water seed treatment may reduce this seedborne disease. Use temperatures and times of 122 F for 25 minutes for spinach. Rotate to non-host crops for 3 years. Varieties with partial resistance are available. Use raised beds

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