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Potato – Diseases Midwest Veg Guide 2022 235 Pesticide copper products (copper hydroxide, copper octanoate, copper oxychloride, copper sulfate, copper diammonium diacetate complex, cuprous oxide) | Several formulations of copper (Badge, Champ, Kocide) products are labelled for use and may slow the spread of bacterial blight. See label for directions. REI: 4 to 48-hour. PHI: 0-day. FRAC M01. OMRI-listed. Double Nickel 55 (25WDG) (Bacillus amyloliquefaciens strain D-747) | 0.125-1 lbs. per acre as a soil drench or 0.25- 3 lbs. per acre as a foliar application, according to disease management considerations. REI: 4-hour. PHI: 0-day. FRAC 44. OMRI-listed. streptomycin products (Streptomycin sulfate) | Use 17% products at 8 oz. per 100 gals of water, or 50% products at 2.7 oz. per 100 gals. of water to maintain a concentration of 100 ppm. Soak seed pieces in solution for several minutes. REI: 12-hour. FRAC 25. Black Scurf of Potatoes - Rhizoctonia Fungus Use a fungicide when appropriate. Non-Pesticide Plant seed pieces certified to be free of disease. Harvest potatoes as soon after maturity as possible. Rotation to a non- host crop 2-3 years. Pesticide azoxystrobin products (azoxystrobin) | Use 2 lb. a.i. per gallon formulations (Quadris) at 0.4-0.8 fl. oz. per 1,000 row feet. Use 3.3 lb. per gallon formulations (Azteroid) at 0.24- 0.48 fl. oz. per 1,000 row feet. Use 0.83 lb. per gallon formulations (Dynasty) for seed treatment at 0.10-3.75 fl. oz. per 100 lbs. of seed. REI: 4-hour. FRAC 11. Moncut (3.8) (flutolanil) | 0.7-1.1 lbs. per acre of the DF formulation or 16-25 fl. oz. per acre of the SC formulation. REI: 12-hour. FRAC 07. Dry Rot of Potatoes - Fusarium Fungus Avoid bruising at harvest. Cure potatoes in storage at 60 degrees F before lowering temperature. Provide adequate ventilation. Non-Pesticide Avoid bruising at harvest. Cure potatoes in storage at 60 degrees F before lowering temperature. Provide adequate ventilation. Pesticide mancozeb products (mancozeb) | Seed treatment; dip whole or cut potatoes in solution. Several formulations of mancozeb (Dithane, Manzate, Penncozeb) are labeled at various rates. See label for directions. REI: 24-hour. PHI: 3-day in Michigan and Ohio; 14-day in all other states. FRAC M03. Maxim 4FS (fludioxonil) | 0.08 fl. oz. per 100 lbs. of seed. Seed treatment. Use specific application equipment according to label. REI: 12-hour. FRAC 12. Maxim MZ (mancozeb, fludioxonil) | 0.5 lbs. per 100 lbs. of seed. Seed treatment. REI: 24-hour. FRAC M03, FRAC 12. Mertect 340-F (SC) (thiabendazole) | 0.42 oz. per 2,000 lbs. of tubers. 0.42 fl. oz. per 2,000 lbs. of tubers. Do not treat seed potatoes after cutting. Fungicide resistance known REI: 12-hour. FRAC 01. Seed treatments for diseases (mefenoxam, fludioxonil, azoxystrobin, thiabendazole, difenoconazole, prothioconazole, sedaxane, penflufen) | Rates vary by product. Select seed treatments Cruiser Maxx Vibrance Potato (thiamethoxam, difenconazole, sedaxane, fludioxonil); Cruiser Maxx Potato Extreme (thiamethoxam, difenoconazole, fludioxonil); Emesto Silver (penflufen, prothioconazole). FRAC 04, FRAC 12, FRAC 11, FRAC 01, FRAC 03, FRAC 07. Stadium (FSC) (azoxystrobin, difenoconazole, fludioxonil) | 1 fl. oz. per 2,000 lbs. of tubers. Postharvest application only; no more than one application to tubers. FRAC 11, FRAC 03, FRAC 12. Early Blight of Potatoes - Alternaria Fungus This disease initially causes lesions on lower leaves of the potato plant. After field planting, begin protective fungicide applications on a 7-14 day schedule. Group 11 Resistance: Strains of the fungus that causes early blight that are resistant to group 11 fungicides have been observed in Indiana and Ohio. Group 11 products labeled for potato and early blight include Cabrio and Quadris. Tank-mix group 11 fungicides with products that have a different mode