Midwest Vegetable Guide - 2022 - 231

Onions and Related Crops - Weeds
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
not recommended. May be sprayed over transplants. REI: 12hour.
HRAC 03.
Dual Magnum (7.62EC) (s-metolachlor) PRE
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 6leaf
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: 45day.
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
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
231
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: 4hour
to 12-hour. PHI: 14-day. HRAC 9.
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 0.671.33
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.
Midwest Vegetable Guide - 2022

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