Insecticide Treatment Options for Grasshoppers in Field Corn

Updated February 15, 2017

Economic Thresholds:

Grasshopper Population
(Hoppers/Square Yard)		 Field Field
Margin		 Treatment
necessary?
Non-economic 0-2 5-10 No
Light 3-7 11-20 Questionable, depends on size, species, type of crop
Moderate 8-14 20-40 Probably
Abundant 15 or more 41 or more Yes

A Guide to Grasshopper Control in Cropland

Go to https://www.greenbook.net or other resource for additional registrations.
*Consult product label for specific information and restrictions.

IRAC Mode of Action Classification:
  • Group 1 = Acetylcholine esterase inhibitors; 1A = Carbamates, 1B = Organophosphates
  • Group 3 = Sodium channel modulators
  • Group 28 = Ryanodine receptor modulators, Diamides
R = Restricted-Use Product

Mode Of
Action
Product
Name
Common
Name
Rate
(Formulation/Acre)
Restrictions/Comments
3 R
Asana XL
esfenvalerate
5.8-9.6 oz
 PHI 21 days. Lower rates may be used for smaller grasshoppers. Higher rates may be necessary to control large populations, or mature grasshoppers.
3 R Baythroid XL,
Tombstone		 cyfluthrin 2.1-2.8 fl oz PHI 21 days for grain or fodder and 0 days for green forage.
3, 28 R Besiege lambda-cyhalothrin,
chlorantraniliprole		 6-10 fl oz PHI 21 days. Do not feed treated corn fodder or silage to meat or dairy animals within 21 days after last treatment.
3 R Brigade 2EC,
Fanfare 2EC,
Bifenture EC,
Discipline 2EC,
Sniper,
Tundra EC
bifenthrin
2.1-6.4 fl oz
 PHI 30 days. Do not graze livestock in treated area or cut treated crops for feed within 30 days of treatment.
1B, 3 R Cobalt chlorpyrifos and
gamma cyhalothrin		 7-13 fl oz PHI 21 days for grain, ears, forage or fodder.
1B, 3 R Cobalt Advanced chlorpyrifos and
gamma cyhalothrin		 6-13 fl oz PHI 21 days for grain, ears, forage or fodder.
28 Coragen rynaxypry 2-5 fl oz PHI 14 days.
3 R Declare gamma-cyhalothrin 1.02-1.54 fl oz PHI 21 days for grain, livestock grazing or silage harvest.
3 R Delta Gold deltamethrin 1.0-1.5 fl oz PHI 21 days for grain or fodder. PHI 12 days for cutting or grazing for forage.
1B
Dimethoate 4EC
dimethoate
1 pt
 PHI 28 days for grain and 14 days for forage.
3 R Fastac EC alpha-cypermethrin 2.7-3.8 fl oz PHI 30 days for grain and stover. PHI 60 days for forage.
3 R Hero zeta-cypermethrin
and bifenthrin		 2.6-6.1 fl oz PHI 30 days for grain or stover and 60 days for forage. Do not graze livestock in treated areas or cut treated crops for feed within 30 days of the last application.
1B R Lorsban Advanced,
Lorsban 4E,
Govern 4E,
Hatchet,
Nufos 4E,
Warhawk,
Yuma 4E
chlorpyrifos
½-1 pt
 PHI 21 days.
1B R Methyl 4EC methyl parathion 1 pt
 PHI 12 days. Do not apply during the pollen shed period.
3 R Mustang Maxx,
Respect
zeta-cypermethrin
2.72-4.0 fl oz
 PHI 30 days for grain and stover. PHI 60 days for forage.
1B R
Penncap-M
methyl parathion
2-3 pts
 PHI 12 days for harvest, forage and grazing.
3 R Proaxis gamma-
cyhalothrin		 2.56-3.84 fl oz PHI 21 days.
1B, 3 R Stallion chlorpyrifos and
zeta-cypermethrin		 9.25-11.75 fl oz PHI 30 days for grain or stover and 60 days for forage.
3 R Steed zeta-cypermethrin
and bifenthrin		 3.5-4.7 fl oz PHI 30 days for grain or stover and 60 days for forage. Do not graze livestock in treated areas or cut treated crops for feed within 30 days of the last application.
1B, 3 R Tundra Supreme chlorpyrifos
and bifenthrin		 5.6-16.8 fl oz PHI 30 days for grain and silage.
3 R Warrior
w/ Zeon
Technology,
Silencer		 lambda-cyhalothrin 2.56-3.84 fl oz PHI 21 days for harvest, grazing or cutting treated crops for feed.
3 R Warrior II
w/ Zeon
Technology		 lambda-cyhalothrin 1.28-1.92 fl oz PHI 21 days for harvest, grazing or cutting treated crops for feed.