Midwest Vegetable Guide - 2022 - 229

Onions and Related Crops - Insects
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
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
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: 12hour.
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 1.25Midwest
Veg Guide 2022
229
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.
Midwest Vegetable Guide - 2022

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