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2022 Midwest Vegetable Guide

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Onions and Related Crops – Weeds 231 weeders, and others. A stale seedbed can be prepared prior to transplanting with flame weeding or very shallow cultivation to control emerged weeds, instead of herbicides. Some growers also use flaming successfully over the top of young onions or garlic, or directed toward the bases of larger plants, even though some crop injury is likely with postemergence flaming. For transplanted sweet onions, plastic mulched beds are commonly used to manage weeds in the row with two or three rows of onions per bed. Black plastic can damage maturing onions in high-light conditions. For this reason, many growers prefer white-on-black plastic with the white side up. Pesticide Aim EC (2) (carfentrazone) POST Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 0.5-2 fl. oz. per acre. Apply a minimum of 30 days prior to direct-seeding or with a hooded sprayer as a directed application between crop rows. Add 1 qt. COC (1% v/v) or 0.5 pt. NIS per 25 gal. of spray solution (0.25% v/v). Weeds must be actively growing and less than 4 inches tall. Do not exceed 6.1 fl. oz. per acre per season. Do not allow spray to contact crop. REI: 12-hour. HRAC 14. Chateau SW (51WDG) (flumioxazin) PRE Garlic, Onion (Dry) | For garlic: apply 6 oz. per acre within 3 days after planting and before garlic emerges. Do not exceed 6 oz. per acre per growing season. For onion in Michigan only: apply 2 oz. per acre to transplanted onions between the 2- and 6-leaf stage or to direct-seeded onions between the 3- and 6- leaf stage and prior to weed emergence. Do not exceed 2 oz. per acre per application or 3 oz. per acre per growing season. Will not control emerged weeds. Wait at least 14 days between repeat applications. Do not tank mix with adjuvants or other herbicides. REI: 12-hour. PHI: 45-day for dry bulb onion. HRAC 14. clethodim products (clethodim) POST Garlic, Onion (Dry) | Use 2EC formulations at 6-16 fl. oz. per acre with 1 qt. COC per 25 gals. of spray solution (1% v/v). Do not exceed 32 fl. oz. per acre per season. Use Select Max at 9-16 fl. oz. per acre to control annual grasses and 12-32 fl. oz. per acre to control perennial grasses. Add 0.5 pt. NIS per 25 gals. of spray solution (0.25% v/v). Do not exceed 64 fl. oz. per acre per season. Spray on actively growing grass. Wait at least 14 days between applications. REI: 24-hour. PHI: 45- day. HRAC 01. Dacthal Flowable (6F) (DCPA) PRE Leek, Onion (Dry), Onion (Green), Shallot | 6-14 pts. per acre. Apply at seeding, transplanting, and/or layby. Preplant incorporation not recommended. May be sprayed over transplants. REI: 12- hour. HRAC 03. Dual Magnum (7.62EC) (s-metolachlor) PRE Garlic, Leek, Onion (Dry), Onion (Green), Shallot | Illinois, Indiana, Kansas, Michigan, Minnesota, and Ohio only. IL 24c exp. 12/31/24. KS & MI 24c exp. 12/31/21. MN 24c exp. 12/31/25. OH 24c exp. 12/31/22. For dry onion: apply 0.67- 1.33 pts. per acre prior to weed emergence and when the crop has at least 2 true leaves. A second application may be applied 21 or more days after the first. Do not exceed 1.3 pts. per acre per application and 2.6 pts. per acre per crop and two applications per crop. For all else except in Kansas: Apply 0.67-1.33 pts. per acre postemergence starting when the crop has 2 true leaves. Do not exceed 1.3 pts. per acre per season. REI: 24-hour. PHI: 60-day for dry bulb onion; 21-day for all else. HRAC 15. Fusilade DX (2EC) (fluazifop-P) POST Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 10-12 fl. oz. per acre. Add 1 qt. COC (1% v/v) or 0.5 pt. NIS per 25 gal. of spray solution (0.25% v/v). Apply to small actively growing grass. Do not exceed 48 fl. oz. per acre per year. REI: 12-hour. PHI: 45-day for garlic and dry bulb onion (dry), 14-day for green onion and leek. HRAC 01. glyphosate products (glyphosate) POST Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 0.75-3.75 lbs. acid equivalent (ae) per acre. Use formulations containing 3 lbs. ae per gal. (4 lbs. isopropylamine salt per gal.) at 1-5 qts. per acre, or formulations containing 4.5 lbs. ae per gal. (5 lbs. potassium salt per gal) at 0.66-3.3 qts. per acre. Broadcast before planting, after planting but before crop emergence, or apply between crop rows with hooded or shielded sprayers. Use low rate for annuals and higher rates for perennials. See label for suggested application volume and adjuvants. REI: 4- hour to 12-hour. PHI: 14-day. HRAC 9. GoalTender (4) (oxyfluorfen) POST PRE Garlic, Onion (Dry) | Seeded crops: Broadcast 0.25 pt. per acre GoalTender or 0.5 pt. per acre Goal 2XL after crop has 2 true leaves. Transplanted crops: Broadcast 0.5-1 pt. per acre GoalTender or 1-2 pts. per acre Goal 2XL prior to transplanting (onion only), or within 2 days of transplanting. Greenhouse-grown transplants may be sensitive to GoalTender at transplanting. Also works preemergent weeds, and on actively growing postemergent weeds with 2-4 leaves. May cause foliar injury during cool weather. Use lower rate on coarse soils. Do not exceed 1 pt. per acre per season GoalTender or 2 pts. per acre per season Goal 2XL. REI: 24 to 48-hour. PHI: 45-day for onion, 60-day for garlic. HRAC 14. Midwest Veg Guide 2022

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