Insecticide Treatment Options for Fall Armyworm in Field Corn

Updated February 14, 2017

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).

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 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 2EC
permethrin
6.4-12.8 fl oz
 PHI 30 days for grain or fodder (stover). Forage may be harvested on the day of application.
3 R Arctic 3.2EC permethrin 4-6 fl oz PHI 30 days for harvest of grain or fodder (stover). Forage may be harvested on the day of application.
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 and 0 days for green forage.
28 Belt SC flubendiamide 2-3 fl oz PHI 1 day for green forage and silage and 28 days for grain or stover.
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. Use higher listed rates witin the listed rate range for large larvae.
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		 13-26 fl oz PHI 21 days for grain, ears, forage or fodder.
1B, 3 R Cobalt Advanced chlorpyrifos and
gamma cyhalothrin		 11-26 fl oz PHI 21 days for grain, ears, forage or fodder.
28 Coragen rynaxypry 3.5-7.5 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 1.5-1.9 fl oz PHI 21 days for grain or fodder. PHI 12 days for cutting or grazing for forage.
3 R Fastac EC alpha-cypermethrin 3.2-3.8 fl oz PHI 30 days for grain and stover. PHI 60 days for forage.
3 R Hero zeta-cypermethrin
and bifenthrin		 4.0-10.3 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.
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.
28
Lumivia
chlorantriniliprole
0.25-0.75 mg ai/kernel
 Do not exceed a maximum of 0.054 lb ai/A
1B R Methyl 4EC methyl parathion 0.5 pt
 PHI 12 days. Do not apply during the pollen shed period.
3 R

Mustang Maxx,
Respect

 zeta-cypermethrin 3.2-4.0 fl oz PHI 30 days for grain and stover. PHI 60 days for forage.
3 R Pounce 25WP permethrin 6.4-9.6 oz PHI 30 days for grain and fodder.
28 Prevathon chlorantraniliprole 14-20 fl oz PHI 14 days for harvest of ears and 1 day for forage, fodder, silage or stover.
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 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.
5 Tracer spinosad 1-3 fl oz PHI 28 days for grain and 3 days for fodder or forage harvest.
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 *For control of 1st and 2nd instar only. *Use higher rates for large larvae. 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 *For control of 1st and 2nd instar only. *Use higher rates for large larvae. PHI 21 days for harvest, grazing or cutting treated crops for feed.