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2022 Midwest Vegetable Guide

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Sweet Corn – Insects Midwest Veg Guide 2022 273 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. Stewart's Wilt of Corn - Pantoea Bacteria This bacterial disease is spread by overwintered flea beetles in the spring time. If the plants become infected at the seedling stage, they become severely stunted and have white striping on the leaves and internal browning of stem tissue. Infections after the seedling stage will cause leaf blight and are generally not as economically severe as seedling infections. Early infection of seedling plants can lead to total yield loss in some plantings. Severity of the disease is directly related to overwintering survival of the flea beetle, and beetle survival depends directly on temperature. See insect section. Non-Pesticide Plant wilt-resistant, or partially resistant hybrids. Monitor overwintering flea beetle population. Pesticide Insecticides | Use an insecticide or seed treatment to control the flea beetles that transmit Stewart's wilt. Insecticide treatments are more likely to be necessary in season following a mild winter and when using susceptible varieties. Viruses of Multiple Crops - Multiple Pathogens Non-Pesticide Virus diseases include maize dwarf mosaic, chlorotic dwarf, wheat streak mosaic. Plant resistant or partially resistant varieties. Control Johnson grass and volunteer wheat. Sweet Corn – Insects Reviewed by Laura Ingwell – Sept 2021 Recommended Controls Aphids Non-Pesticide Heavy corn leaf aphid infestations are often limited to early- season plantings that develop on late whorl to early tassel sweet corn. During this time, several beneficial organisms (including lady beetles, minute pirate bugs, and parasitoids) will keep those infestations in check. Pesticide Asana XL (0.66EC) (esfenvalerate) | 2.9-9.6 fl. oz. per acre. Caterpillars include cutworms, corn borers, and earworms. Do not exceed 9.6 fl. oz. per acre per season. REI: 12-hour. PHI: 1-day. IRAC 03A. RUP. Assail 30SG (acetamiprid) | Use 30SG formulations at 2.1- 2.9 oz. per acre and do not exceed 11.2 oz. per acre per season. Use 70WP formulations at 0.9-1.2 oz. per acre and do not exceed 4.8 oz. per acre per season. Allow 7 days between applications. REI: 12-hour. PHI: 1-day. IRAC 04A. Capture LFR (1.5) (bifenthrin) | 2.8-8.5 fl. oz. per acre. Apply as a foliar spray. REI: 12-hour. PHI: 1-day. IRAC 03A. RUP. Lannate LV (2.4L) (methomyl) | 0.75 - 1.5 pts. per acre. Do not exceed 21 pts. per acre per crop. Some varieties are susceptible to methomyl injury; determine crop safety before full scale spraying. REI: 48-hour. PHI: 0-day for ears, 3-day for forage. IRAC 01A. RUP. Mustang Maxx (0.8) (zeta-cypermethrin) | 2.8-4.0 fl. oz. per acre. For armyworms, corn borers, cutworms, and earworms. Do not exceed 24 fl. oz. per acre per season. REI: 12-hour. PHI: 3-day. IRAC 03A. RUP.

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