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University of Nebraska–Lincoln

Department of Entomology

Insecticide Treatment Options for Armyworm in Field Corn

Updated July 14, 2009 by Robert Wright

Economic Threshold:
 More than 50% of plants with armyworm feeding damage, and
live armyworms less than 1.25 inches long are numerous (Purdue University).

This list is not inclusive. See http://www.greenbook.net or other resources for additional registrations.
This information is presented in abbreviated form. Be sure to consult the label for additional information and restrictions.

IRAC Mode of Action Classification:
  • Group 1 = Acetylcholine esterase inhibitors; 1A = Carbamates, 1B = Organophosphates
  • Group 3 = Sodium channel modulators
  • Group 5 = Nicotinic acetylcholine receptor agonists (allosteric), Spinosyns
R = Restricted-Use Product
Mode of
Action
Product
Name
Common
Name
Rate
(Formulation/Acre)
Restrictions/Comments
3 R Ambush 2 E permethrin 6.4-12.8 oz
3 R Asana XL esfenvalerate 5.8-9.6 oz
3 R Baythroid 2 cyfluthrin 1.6-2.8 fl oz PHI 21 days for grain or fodder. REI 12 hrs.
1A Lannate LV methomyl 0.75 - 1.50 lbs/acre Do not apply more than 2.25 lb ai per acre per crop.
1A Lannate SP methomyl 0.25-0.50 lb/acre Do not apply more than 2.25 lb ai per acre per crop.
1B R Lorsban 4 E chlorpyrifos 1-2 pints  
3 R Mustang Max zeta-cypermethrin 3.2-4.0 oz/acre May be chemigated. Do not apply within 30 days of harvest for grain and fodder, and 60 days for forage. Apply in a min. spray volume of 2 gal/acre by air.
1B Nufos 4E chlorpyrifos 1-2 pt/acre For aerial applications use 2 - 5 gal of spray per acre. Do not apply within 35 days of harvest of grain.
1B R Penncap-M methyl parathion 2-3 pints Do not apply during pollen-shed if bees are foraging in the areas to be treated.
3 R Pounce 1.5G permethrin 6.7-13.3 lb/acre Up to 0.6 lb ai per acre may be used per season.
3 R Pounce 3.2 EC permethrin 4-8 oz
3 R Pounce 25WP permethrin 6.4-12.8 oz/acre Up to 0.6 lb ai per acre may be used per season.
3 R Proaxis gamma-
cyhalothrin 		2.56-3.84 fl oz/acre For control of 1st and 2nd instars only.
1A Sevin 4F carbaryl 1-2 qt/acre Repeat applications as needed up to a total of 4 times, but not more often than once every 14 days. Do not apply within 48 days of harvest or grazing of forage or silage.
1A Sevin XLR Plus carbaryl 2-4 pints
5 Tracer spinosad 2-3 fl oz/acre Do not apply more than 6 fl oz per acre per year. Do not apply within 28 days of grain or fodder harvest or within 7 days of forage harvest.