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Cucurbit Crops – Diseases Midwest Veg Guide 2022 127 off caused by Phytophthora and Pythium. Ridomil products cannot be used until 6 weeks after transplant. REI: 48-hour. FRAC 04. azoxystrobin products (azoxystrobin) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | Use 0.83 lb. per gallon formulations (Dynasty) for seed treatment at 0.10-0.38 fl. oz. per 100 lbs. of seed. REI: 4-hour. PHI: 1-day. FRAC 11. Maxim 4FS (fludioxonil) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | 0.08-0.16 fl. oz. per 100 lb. of seed. Seed treatment will help prevent damping-off caused by Rhizoctonia spp. REI: 12-hour. FRAC 12. Previcur Flex (6) (propamocarb) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | For Pythium in the field, apply 0.6-1.2 pts. per acre directed to base of plant and surrounding soil, or through drip irrigation or transplant water. In the greenhouse, maintain a 1:1000 stock solution of 12.8 fl. oz. per 100 gals. of water. Use that stock at 3.4-6.8 fl. oz per plant. REI: 12-hour. PHI: 2-day. FRAC 28. Ridomil Gold SL (4SC) (mefenoxam) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | 1-2 pts. per acre. For use on damping-off caused by Pythium species. Other formulations include MetaStar, Subdue Maxx, Ultra Flourish, and Xyler. Rates vary by formulation. REI: 48-hour. PHI: 5-day. FRAC 04. Downy Mildew of Cucurbits - Pseudoperonospora Oomycete The fungus-like organism that causes downy mildew, Pseudoperonospora cubensis, has two clades. Clade 1 occurs more frequently on watermelon, pumpkin, and squash while clade 2 occurs more frequently on cucumber and cantaloupe. The pathogen does not survive Midwest winters because it requires green, living plant tissues. That means this organism only overwinters in south Florida or in greenhouses in northern U.S and Canada. The wind carries downy mildew spores to new, living hosts in the Midwest as early as July, and sometimes not at all. Since pumpkins are grown until relatively late in the growing season, this crop is often affected more than other cucurbits. Clade 2 of the pathogen can quickly become resistant to fungicides, and some are no longer effective. Strobilurin fungicides (such as Cabrio, Flint, Merivon, Pristine, Quadris, Reason, Satori) and fungicides with the active ingredient mefenoxam (such as Ridomil) are particularly prone to resistance. In addition, Revus and Previcur Flex have occasionally been ineffective for management of downy mildew. In addition, Revus and Previcur Flex have occasionally been ineffective for management of downy mildew. Non-Pesticide Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | Partially-resistant varieties of cucumber and cantaloupe are available. If your market supports it, avoid late planted cucumbers that will yield after early July when disease pressure is strongest. Pesticide Catamaran (potassium phosphite, chlorothalonil) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | 6 pts. per acre. REI: 12-hour. PHI: 1-day. FRAC 33, FRAC M05. chlorothalonil products (chlorothalonil) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | Several formulations of chlorothalonil (Bravo, Echo, Equus) are labeled at various rates. See label for directions. REI: 12-hour. PHI: 0-day. FRAC M05. Elumin (4SC) (ethaboxam) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | 8 fl. oz. per acre. Tank-mixing this product with a contact fungicide such as chlorothalonil or mancozeb will help reduce resistance concerns. REI: 12-hour. PHI: 2-day. FRAC 22. Forum (4.17SC) (dimethomorph) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | 6 fl. oz. per acre. REI: 12-hour. PHI: 0-day. FRAC 40. Gavel 75DF (zoxamide, mancozeb) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | 1.5-2.0 lbs. per acre. REI: 48-hour. PHI: 5-day. FRAC 22, FRAC M03. mancozeb products (mancozeb) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | Several formulations of mancozeb products (Dithane, Manzate, Penncozeb) are labeled at various rates. See label for directions. REI: 24-hour. PHI: 5-day. FRAC M03. Omega 500F (4.17) (fluazinam) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | 0.75-1.5 pts. per acre. REI: 12-hour. PHI: 7-day for cucumber and squash, 30- day PHI for watermelon, and cantaloupe/muskmelon. FRAC 29. Orondis Opti Premix (SC) (oxathiapiprolin, chlorothalonil) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | 1.75-2.5 pts. per acre. Make no more than 2 sequential applications before rotating to a different mode of action. When 3 fungicide applications are used, Orondis can be in no more than 33% of the