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Insecticide Treatment Options for Fall Armyworm in Field Corn

Updated December 20, 2011

Economic Threshold:
An insecticide application may be economically justified when 75% of plants show leaf feeding and larvae are less than 1.25 inch long.
Treatment to control larvae inside the ears is not effective (University of Missouri).

For more information, see NebGuide 1300, Insects That Feed on Corn Ears

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
  • Group 28 = Ryanodine receptor modulators, Diamides
R = Restricted-Use Product
Mode Of
Action
Product
Name
Common
Name
Rate
(Formulation/Acre)
Restrictions/Comments
3 R Ambush permethrin 6.4-12.8 fl oz

PHI 30 days for grain or fodder.
3 R Arctic 3.2EC permethrin 4-6 fl oz

PHI 30 days for grain or fodder.
3 R

Baythroid XL,
Tombstone

 cyfluthrin 2.8 fl oz

*For control of 1st and 2nd instar only. PHI 21 days for grain or fodder.
28 Belt flubendiamide 2-3 fl oz

PHI 1 day for green forage and silage and 28 days for grain or stover.
3 R

Brigade 2EC,
Fanfare 2EC

 bifenthrin 2.1-6.4 fl oz PHI 30 days.
1B, 3 R Cobalt

chlorpyrifos and
gamma cyhalothrin

 13-26 fl oz PHI 21 days for grain and 14 days for silage and grazing.
28 Coragen rynaxypry 3.5-5.0 fl oz

PHI 14 days.
3 R Delta Gold deltamethrin 1.5-1.9 fl oz

PHI 21 days for grain or fodder and 12 days for grazing.
3 R Hero

zeta-cypermethrin
and bifenthrin

 4.0-10.3 fl oz PHI 30 days for grain and 60 days for forage.
1A R Lannate LV methomyl 0.75-1.50 pts

PHI 21 days for ears and stover and 3 days for forage.
1A R Lannate SP methomyl 0.25-0.50 lb

PHI 21 days for ears and stover and 3 days for forage.
1B R Methyl 4EC methyl parathion 0.5 pt

PHI 12 days. Do not apply during the pollen shed period.
3 R

Mustang Max EC,
Respect

 zeta-cypermethrin 3.2-4.0 fl oz PHI 30 days for grain and fodder and 60 days for forage.
3 R Pounce 25WP permethrin 6.4-9.6 oz

PHI 30 days for grain and fodder.
3 R Proaxis

gamma-
cyhalothrin

 2.56-3.84 fl oz *For control of 1st and 2nd instars only. PHI 21 days.
1A Sevin XLR Plus carbaryl 1-2 qts

PHI 48 days for grain and fodder or 14 days for grazing and silage.
1B, 3 R Stallion

chlorpyrifos +
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 and 60 days for forage.
5 Tracer spinosad 1-3 fl oz

PHI 28 days for grain and 3 days for fodder and forage.
3 R

Warrior w/
Zeon Technology,
Silencer

 lambda-cyhalothrin 2.56-3.84 fl oz *For control of 1st and 2nd instar only. PHI 21 days.
3 R

Warrior II w/
Zeon Technology

 lambda-cyhalothrin 1.28-1.92 fl oz *Use higher rates for large larvae. PHI 21 days.