Midwest Vegetable Guide - 2022 - 230

Onions and Related Crops - Weeds
2.5 oz. per acre and do not exceed 9 oz. per acre per season.
Observe resistance management restrictions. Allow 4 days
between applications. REI: 4-hour. PHI: 1-day. IRAC 05.
OMRI-listed.
Exirel (0.83SE) (cyantraniliprole) Garlic, Leek, Onion
(Dry), Onion (Green), Shallot | 13.5-20.5 oz. per acre. Use at
1 thrips per leaf threshold. For suppression only. For best
results, use highest rate listed. If thrips populations are high,
use Radiant before using Exirel. Tank mix with nonionic
surfactant (0.25%-0.5% v/v) for best efficacy. Allow 5 days
between applications. Do not make more than 2 consecutive
applications before switching to another mode of action.
Therefor, do not use in sequence before or after Minecto Pro
since it contains the same active ingredient. REI: 12-hour.
PHI: 1-day. IRAC 28.
Lannate LV (2.4L) (methomyl) Onion (Dry), Onion
(Green) | 3 pts. per acre. Do not exceed 18 pts. per acre per
season on green bunching onions, or 12 pts. per acre per
season on dry bulb onions. REI: 48-hour. PHI: 7-day. IRAC
01A. RUP.
Minecto Pro (1.13SC) (cyantraniliprole, abamectin)
Garlic, Leek, Onion (Dry), Onion (Green), Shallot | 7.0-10
oz. per acre. Use at 1 thrips per leaf threshold. For
suppression only. For best results, use highest rate listed. Not
for rescue treatments. Tank mix with nonionic surfactant
(0.25%-0.5% v/v) for best efficacy. Allow 5 days between
applications. Do not make more than 2 consecutive
applications before switching to another mode of action. Do
not use before or after Exirel or Agri-Mek since these contain
the same active ingredients. REI: 12-hour. PHI: 30-day for
dry onion, shallots, and garlic.; 7-day for green bunching
onion, shallots, and leek IRAC 28, IRAC 06. RUP.
Movento (2SC) (spirotetramat) Garlic, Leek, Onion (Dry),
Onion (Green), Shallot | 5 oz. per acre. Use in June or July
when populations reach the 1 thrips per leaf threshold for the
first time of the season. Tank mix with nonionic surfactant
(0.25%-0.5% v/v) for best efficacy. Allow 7 days between
applications. Do not make more than 2 consecutive
applications before switching to another mode of action. REI:
24-hour. PHI: 3-day for dry onion, shallots, and garlic.; 7-day
for green bunching onion, shallots, and leek IRAC 23.
Perm-Up 25DF (permethrin) Garlic, Onion (Dry) | 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 6-12
fl. oz. per acre for dry onion and 6-8 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. Many onion thrips
populations have developed resistance to this insecticide, so
efficacy may vary. REI: 12-hour. PHI: 1-day. IRAC 03A.
RUP.
230
Radiant 1SC (spinetoram) Garlic, Leek, Onion (Dry),
Onion (Green), Shallot | 6-10 fl. oz. per acre. Use at 3 thrips
per leaf threshold. Do not exceed 30 fl. oz. per acre per
season or 5 applications. Do not make more than 2
consecutive applications before switching to another mode of
action. REI: 4-hour. PHI: 1-day. IRAC 05.
Torac (1.29SC) (tolfenpyrad) Garlic, Leek, Onion (Dry),
Onion (Green), Shallot | 24 fl. oz. per acre. Do not exceed 72
fl. oz. per acre per year. REI: 12-hour. PHI: 7-day. IRAC
21A, FRAC 39.
Warrior II (2.08CS) (lambda-cyhalothrin) Garlic, Onion
(Dry) | 1.28-1.92 fl. oz. per acre. Many onion thrips
populations have developed resistance to this insecticide so
efficacy may vary. Do not exceed 15.36 fl. oz. per acre per
season. REI: 24-hour. PHI: 14-day. IRAC 03A. RUP.
Onions and Related Crops -
Weeds
Reviewed by Stephen Meyers, Ben Phillips - Sept 2021
Recommended Controls
All Weeds
Onions and related crops pose challenges for weed control
because the narrow leaves and short height of the crop
provide little shade to suppress weed growth, and, except for
green onions, the crops grow for several months.
Prepare a stale seedbed several weeks in advance of planting,
allow weeds to emerge, and kill weeds without bringing new
weed seeds to the surface with a burndown herbicide, flame
weeder, or very shallow cultivation.
For specific weeds controlled by each herbicide, check the
Relative Effectiveness of Herbicides for Vegetable Crops
table.
Rates provided in the recommendations below are given for
overall coverage. For a banded treatment, reduce amounts
according to the portion of acre treated.
Non-Pesticide
Garlic, Leek, Onion (Dry), Onion (Green), Shallot | Weed
control in onions often relies heavily on cultivation and hand
weeding for full season weed control. These operations are
most efficient when planting arrangement is designed with
weed control in mind and is designed to work with available
weed control equipment. Specialized weeding equipment for
onions includes basket weeders, narrow-bladed hoes, finger
Midwest Veg Guide 2022
Midwest Vegetable Guide - 2022

Table of Contents for the Digital Edition of Midwest Vegetable Guide - 2022
