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2022 Midwest Vegetable Guide

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Sweet Corn – Diseases Midwest Veg Guide 2022 271 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) | 7-14 fl. oz. per acre. Use lower rate for early season applications and increase rate with disease pressure. 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. Northern Corn Leaf Spot 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. 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) | 7-14 fl. oz. per acre. Use lower rate for early season applications and increase rate with disease pressure. 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. Rust of Multiple Crops - Puccinia Fungus This pathogen can severely reduce yields of grain corn late in the season through defoliation of the plant, but because sweet corn is harvested long before maturity they are less impacted. If rust shows up before tassel then it is worth spraying for in sweet corn to keep healthy leaves until harvest. Non-Pesticide Plant resistant hybrids. Sweet corn hybrid resistance to rust will depend on the hybrid's particular Rp-resistant gene, its general (background) resistance, and the race(s) of the rust prevalent in the planting.

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