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2022 Midwest Vegetable Guide

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Onions and Related Crops – Insects Midwest Veg Guide 2022 229 Topsin 4.5FL (thiophanate-methyl) Garlic, Onion (Dry) | Use 4FL formulation or Cercobin at 40 fl. oz. per acre, or 70WSB formulation at 2 lb. per acre. REI: 24-hour to 3-day. PHI: 3-day. FRAC 01. Onions and Related Crops – Insects Reviewed by Laura Ingwell, Zsofia Szendrei – Sept 2021 Recommended Controls Seed and Root Maggots Non-Pesticide Garlic, Leek, Onion (Dry), Onion (Green), Shallot | Plant after the peak flight and egg-laying window of the first generation of flies looking to lay eggs around 700 GDD base 40. Handle seeds carefully to prevent cracking. Plow winter vegetation under early in the spring and thoroughly cover to limit attractiveness of rotting vegetation to the first generation of flies to lay eggs on. Pesticide Diazinon AG500 (4ES) (diazinon) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 2-4 qts. per acre. Use 50W formulations at 4-8 lbs. per acre as a pre-plant incorporation and do not exceed 8 lbs. per acre per season. Use AG500 formulations at 64-128 fl. oz. per acre as a pre-plant incorporation and do not exceed 128 fl. oz. per acre per season. Use AG600 formulations at 51-102 fl. oz. per acre as a pre-plant incorporation and do not exceed 102 fl. oz. per acre per season. Onion maggot exhibit resistance to diazinon. REI: 2 to 4-day. IRAC 01B. RUP. Mustang Maxx (0.8) (zeta-cypermethrin) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 2.24-4.0 fl. oz. per acre. For adult control only. Do not exceed 20 fl. oz. per acre per season. Allow y days between applications. Add COC at 16 fl. oz. per acre. REI: 12-hour. PHI: 7-day. IRAC 03A. RUP. Perm-Up 25DF (permethrin) Garlic, Onion (Dry) | For adult control only. Use 25W, 25WP, and 25DF formulations at 9.6-19.2 oz. per acre for dry onion or 9.6-12.8 oz. per acre for garlic, and not exceed 64 oz. per acre per season for dry onion or 51.2 oz. per acre per season for garlic. Use 3.2EC formulations at 4-12 fl. oz. per acre for dry onion and 4-8 fl. oz. per acre for garlic, and do not exceed 40 fl. oz. per acre per season on dry onion or 32 fl. oz. per acre per season on garlic. REI: 12-hour. PHI: 1-day. IRAC 03A. RUP. Seed treatments for insects (thiamethoxam, spinosad, abamectin) Leek, Onion (Dry), Onion (Green), Shallot | Commercial seed treatments offered by seed companies include FarMore FI500 for dry bulb onions through Syngenta and CAPS (Coronet, Allegience, Pro Gro, and Sepresto) on dry bulb onions, green bunch onions and leeks through Nunhem's. IRAC 04A, IRAC 05, IRAC 06. Warrior II (2.08CS) (lambda-cyhalothrin) Garlic, Onion (Dry) | 0.96-1.6 fl. oz. per acre. For adult control only. Do not exceed 15.36 fl. oz. per acre per season. REI: 24-hour. PHI: 14-day. IRAC 03A. RUP. Thrips Threshold for making an insecticide application is 1 thrips per leaf for Agri-Mek, Exirel, Minecto Pro, Movento, Lannate LV and 3 thrips per leaf for Radiant. A suggested treatment schedule starts with two applications of Movento for the first two weekly applications when the thrips population reaches the treatment threshold of 1 thrips per leaf for the first time of the season. Then, rotate products with two sequential weekly applications for each, reserving Radiant for high 3 thrips per leaf thresholds in peak season. Pesticide Agri-Mek SC (0.7) (abamectin) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 1.75-3.5 fl. oz. per acre. Supplemental label available for green onions and leeks. Use at 1 thrips per leaf threshold. Make 2 consecutive applications 7-days apart, then rotate to an insecticide with a different mode of action. Do not use before or after Minecto Pro since it contains the same active ingredient. Do not exceed 14 fl. oz. per acre per season. REI: 12-hour. PHI: 7-day. IRAC 06. RUP. Assail 30SG (acetamiprid) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | Use 30SG formulations at 5.0-8.0 oz. per acre and do not exceed 32 oz. per acre per season. Use 70WP formulations at 2.1-3.4 oz. per acre and do not exceed 13.7 oz. per acre per season. Allow 7 days between applications. Many onion thrips populations have developed resistance to this insecticide, so efficacy will vary. REI: 12- hour. PHI: 7-day. IRAC 04A. Entrust SC (2) (spinosad) Garlic, Leek, Onion (Dry), Onion (Green), Shallot | For armyworms, fruitworms, and loopers. For armyworms, cutworms, and loopers. Use 2SC formulations at 4.0-8.0 fl. oz. per acre and do not exceed 29 fl. oz. per acre per season. Use 80WP formulations at 1.25-

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