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2022 Midwest Vegetable Guide

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Sweet Corn – Diseases 272 Midwest Veg Guide 2022 Pesticide Aproach (2.08SC) (picoxystrobin) | 3-12 fl. oz. per acre. Use 3-6 fl. oz rate for single application for early disease control between V4 and V7. Use the 6-12 fl. oz. rate for repeated applications for continued season long control between VT and R3. REI: 12-hour. PHI: 7-day. FRAC 11. azoxystrobin products (azoxystrobin) | Use 2 lb. a.i. per gallon formulations (Quadris) at 6.0-15.5 fl. oz. per acre. Use 3.3 lb. per gallon formulations (Azteroid) at 3.9-9.7 fl. oz. per acre. REI: 4-hour. PHI: 7-day. FRAC 11. chlorothalonil products (chlorothalonil) | Several formulations of chlorothalonil (Bravo, Echo, Equus) are labeled at various rates. See label for directions. REI: 12- hour. PHI: 14-day. FRAC M05. Elatus (WG) (azoxystrobin, benzovindiflupyr) | 5-7.3 oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 11, FRAC 07. Headline (SC) (2.08) (pyraclostrobin) | 6-12 fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 11. Headline AMP (pyraclostrobin, metconazole) | 10-14.4 fl. oz. per acre. REI: 12-hour. PHI: 20-day. FRAC 11, FRAC 03. mancozeb products (mancozeb) | Several formulations of mancozeb (Dithane, Manzate, Penncozeb) are labeled at various rates. See label for directions. REI: 24-hour. PHI: 7- day. FRAC M03. Priaxor (fluxapyroxad, pyraclostrobin) | 4-8 fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 07, FRAC 11. propiconazole products (propiconazole) | 2-4 fl. oz. per acre. PropiMax EC and Tilt are labeled. REI: 12-hour. PHI: 14-day. FRAC 03. Quilt (SE) (azoxystrobin, propiconazole) | 10.5-14.0 fl. oz. per acre. REI: 12-hour. PHI: 14-day. FRAC 11, FRAC 03. Stratego (propiconazole, trifloxystrobin) | 10 fl. oz. per acre. REI: 12-hour. PHI: 14-day. FRAC 03, FRAC 11. tebuconazole products (tebuconazole) | 4-6 fl. oz. per acre. There are many brand names (Monsoon, Onset, Vibe) with 3.6 lbs. a.i. per gallon that use the same rate. In sweet corn, REI is longer than the PHI, and pickers may require PPE if timing is not planned. REI: 12-hour to 18-day. PHI: 7-day. FRAC 03. Smut of Corn - Ustilago Fungus This pathogen is common at low levels, but it can be worse when roots and stalks are damaged from close cultivation that nips the roots, wind lodging and wind sandblasting, or in times of drought stress. When under drought stress, tasseling and silking do not line up. Tassels come first and silks last longer than usual because they are not getting pollinated. This provides an entry for the fungus into the ears. Flowering patterns and response to environmental stress are unique to each variety. Planting field position in relation to prevailing winds, timing and variety are likely factors for disease occurrence. Non-Pesticide Some hybrids tend to have fewer infections. Use past experience to choose successful hybrids. Avoid mechanical damage to corn plant. Avoid plant stresses that affect pollen production and silk emergence. Southern Corn Leaf Blight of Corn - Bipolaris Fungus Non-Pesticide Rotate to non-host crops for at least 1 year. Varieties with resistance are available. Prompt destruction of the finished crop with tillage to rapidly breakdown tissue is an important method to prevent disease build-up. Pesticide Aproach (2.08SC) (picoxystrobin) | 3-12 fl. oz. per acre. Use 3-6 fl. oz rate for single application for early disease control between V4 and V7. Use the 6-12 fl. oz. rate for repeated applications for continued season long control between VT and R3. REI: 12-hour. PHI: 7-day. FRAC 11. azoxystrobin products (azoxystrobin) | Use 2 lb. a.i. per gallon formulations (Quadris) at 6.0-15.5 fl. oz. per acre. Use 3.3 lb. per gallon formulations (Azteroid) at 3.9-9.7 fl. oz. per acre. REI: 4-hour. PHI: 7-day. FRAC 11. chlorothalonil products (chlorothalonil) | Several formulations of chlorothalonil (Bravo, Echo, Equus) are labeled at various rates. See label for directions. REI: 12- hour. PHI: 14-day. FRAC M05. Elatus (WG) (azoxystrobin, benzovindiflupyr) | 5-7.3 oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 11, FRAC 07. Headline (SC) (2.08) (pyraclostrobin) | 6-12 fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 11. Headline AMP (pyraclostrobin, metconazole) | 10-14.4 fl. oz. per acre. REI: 12-hour. PHI: 20-day. FRAC 11, FRAC 03. mancozeb products (mancozeb) | Several formulations of mancozeb (Dithane, Manzate, Penncozeb) are labeled at various rates. See label for directions. REI: 24-hour. PHI: 7- day. FRAC M03.

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