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2022 Midwest Vegetable Guide

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Potato – Diseases 236 Midwest Veg Guide 2022 of action, or alternate group 11 fungicides with fungicides that have a different group number. Non-Pesticide Avoid fields with a history of nematodes, Fusarium or Verticillium wilts, droughty, wet, or compacted soils, and other conditions (such as insufficient nitrogen) that might add undue stress to the crop and increase susceptibility to early blight. Varieties with partial resistance are available. Rotate to non-host crops for 2-3 years. Pesticide azoxystrobin products (azoxystrobin) | Use 2 lb. a.i. per gallon formulations (Quadris) at 6.0-20.0 fl. oz. per acre. Use 3.3 lb. per gallon formulations (Azteroid) at 3.9-12.8 fl. oz. per acre. REI: 4-hour. PHI: 14-day. FRAC 11. chlorothalonil products (chlorothalonil) | Michigan only -- Bravo Weather Stik (exp. 12/31/2024), Bravo ZN (exp. 12/31/2025), Echo 720 (exp. 12/31/2024), and Echo 90DF (exp. 12/31/2024) can apply up to 16 lbs. a.i. per acre per year. All other states do not exceed 11.25 lbs. a.i. per acre per year. Several formulations of chlorothalonil (Bravo, Echo, Equus) are labeled at various rates. See product labels. REI: 12-hour. PHI: 7-day. FRAC M05. Endura (WG) (boscalid) | 3.5-4.5 oz. per acre. REI: 12- hour. PHI: 10-day. FRAC 07. Gavel 75DF (zoxamide, mancozeb) | 1.5-2 lbs. per acre. REI: 48-hour. PHI: 3-day in Michigan and Ohio; 14-day in all other states. FRAC 22, FRAC M03. Headline (SC) (2.08) (pyraclostrobin) | 6-9 fl. oz. per acre. REI: 12-hour. PHI: 3-day. FRAC 11. iprodione products (iprodione) | 1-2 pts. per acre. Formulations of iprodione include Nevado and Rovral. REI: 24-hour. PHI: 14-day. FRAC 02. Luna Tranquility (SC) (fluopyram, pyrimethanil) | 8-11.2 fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 07, FRAC 09. mancozeb products (mancozeb) | Several formulations of mancozeb (Dithane, Manzate, Penncozeb) are labeled at various rates. See label for directions. REI: 24-hour. PHI: 14- day. FRAC M03. Miravis Prime (SC) (pydiflumetofen, fludioxonil) | 9.2- 11.4 fl. oz. per acre. Black dot suppression only. REI: 12- hour. PHI: 14-day. FRAC 07, FRAC 12. Quadris Opti (SC) (azoxystrobin, chlorothalonil) | 1.6 pts. per acre. REI: 12-hour. PHI: 14-day. FRAC 11, FRAC M05. Revus Top (SC) (mandipropamid, difenoconazole) | 5.5- 7.0 fl. oz. per acre. REI: 12-hour. PHI: 14-day. FRAC 40, FRAC 03. Scala (SC) (5) (pyrimethanil) | 7 fl. oz. per acre. REI: 12- hour. PHI: 7-day. FRAC 09. Tanos (DF) (famoxadone, cymoxanil) | 6 oz. per acre. REI: 12-hour. PHI: 14-day. FRAC 11, FRAC 27. Velum Prime (4.16SC) (fluopyram) | 6.5-6.84 fl .oz. per acre. Apply through overhead chemigation. Do not exceed 13.7 fl. oz. per acre per season. Allow 5 days between applications. REI: 12-hour. PHI: 7-day. FRAC 07. Zing! (zoxamide, chlorothalonil) | 24-34 fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 22, FRAC M05. Late Blight of Potatoes/Tomatoes - Phytophthora Oomycete This destructive pathogen causes quick plant death and can be identified by large spreading brown stem lesions, velvety white growth on plant surfaces, and large brown leathery spots on green fruits. It is favored by prolonged cool and damp conditions. The pathogen overwinters on plant residue, including volunteer potatoes and potato cull piles. When it is reported in your region, begin weekly preventive sprays with chlorothalonil and mancozeb for as long as favorable conditions persist. Pay attention to which pathogen strain is identified. If infections start in a field, the strain US-23 is sensitive to mefenoxam (Ridomil). Non-Pesticide The first step to manage this disease is monitoring and destroying cull and volunteer potato emergence in the spring. Pesticide chlorothalonil products (chlorothalonil) | Michigan only -- Bravo Weather Stik (exp. 12/31/2024), Bravo ZN (exp. 12/31/2025), Echo 720 (exp. 12/31/2024), and Echo 90DF (exp. 12/31/2024) can apply up to 16 lbs. a.i. per acre per year. All other states do not exceed 11.25 lbs. a.i. per acre per year. Several formulations of chlorothalonil (Bravo, Echo, Equus) are labeled at various rates. See product labels. REI: 12-hour. PHI: 7-day. FRAC M05. Curzate 60DF (cymoxanil) | 3.2 oz. per acre. REI: 12-hour. PHI: 14-day. FRAC 27. Gavel 75DF (zoxamide, mancozeb) | 1.5-2 lbs. per acre. REI: 48-hour. PHI: 3-day in Michigan and Ohio; 14-day in all other states. FRAC 22, FRAC M03.

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