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Insecticide Treatment Options for Armyworm in Field Corn

Updated December 20, 2011

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
  • Group 11 = Microbial distuptors of insect midgut membranes (includes transgenic crops expressing Bacillus); 11B2 = B. t. subsp. kurstaki
  • Group 18 = Ecdysone receptor agonists, Diacylhydrazines
  • 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. REI 12 hours.
3 R Arctic 3.2EC permethrin

At Planting:
0.3-0.6 fl oz/1000 row ft

Pre-Plant Incorporated,
Pre-Emergence
and Post Emergence:
4-6 fl oz/acre

 Planting time, Pre-Plant Incorporated, Pre-Emergence and Post-Emergence.
3 R Asana XL 0.66 esfenvalerate 5.8-9.6 fl oz

PHI 21 days. REI 12 hours.
3 R

Baythroid XL,
Tombstone

 cyfluthrin 1.6-2.8 fl oz

PHI 21 days for grain or fodder. REI 12 hrs.
28 Belt flubendiamide 2-3 fl oz

PHI 1 day for green forage and silage and 28 days for grain or stover.
11

Biobit, Deliver,
Dipel, Lepinox,
XenTari, etc.

 Bacillus thuringiensis See Product Label PHI 30 days.
3 R Brigade 2EC,
Fanfare 2EC		 bifenthrin

At Planting:
0.15-0.30 fl oz/1000 row ft

Pre-Plant Incorporated:
3-4 fl oz/acre

Pre-Emergence:
2.56 fl oz/acre

Post Emergence:
2.1-6.4 fl oz/acre

 Field corn (grain and silage), popcorn and seed corn. Apply in a minimum of 2-5 gallons of spray per acre by aircraft or 10 gallons per acre with ground equipment. Do not apply within 30 days of harvest.
1B, 3 R Cobalt

chlorpyrifos and
gamma cyhalothrin

 13-26 fl oz PHI 21 days for grain and 14 days for silage and grazing.
3 R Delta Gold deltamethrin 1.5-1.9 fl oz

PHI 21 days for grain or fodder and 12 days for grazing. REI is 12 hours. Highly toxic to bees.
3 R Hero

zeta-cypermethrin
and bifenthrin

 4.0-10.3 fl oz PHI 30 days for grain and 60 days for forage. REI 12 hours.
18 Intrepid 2F methoxyfenozide 4-16 fl oz

PHI 21 days. REI 4 hours. Do not apply through any irrigation system.
1A R Lannate LV methomyl 0.75-1.50 pts

Do not apply more than 2.25 lb ai per acre per crop.
1A R Lannate SP methomyl 0.25-0.50 lb

Do not apply more than 2.25 lb ai per acre per crop.
1B R Lorsban 4E chlorpyrifos 1-2 pts

PHI 35 days for grain and 14 days for grazing and silage. REI 24 hours.
1B R Methyl 4EC methyl parathion 0.5 pt

Do not apply within 12 days of harvest. Do not apply during the pollen shed period.
3 R

Mustang Max EC,
Respect

 zeta-cypermethrin 3.2-4.0 fl oz

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 R Nufos 4E chlorpyrifos 1-2 pts

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 2F

microencapsulated
methyl parathion

 2-3 pts

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 lbs

Up to 0.6 lb ai per acre may be used per season.
3 R Pounce 25WP permethrin 6.4-9.6 oz

Up to 0.6 lb ai per acre may be used per season.
3 R Proaxis

gamma-
cyhalothrin

 2.56-3.84 fl oz For control of 1st and 2nd instars only.
5 Radiant SC spinetoram 3-6 fl oz

Apply broadcast or direct spray to ear zone.
1A Sevin 4F carbaryl 1-2 qts

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 1-2 qts

PHI 48 days for grain and fodder or 14 days for grazing and silage. REI 12 hours.
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

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.
3 R Tombstone cyfluthrin 1.6-2.8 fl oz

PHI 21 days. REI 12 hours.
3 R

Warrior w/
Zeon Technology,
Silencer

 lambda-cyhalothrin 2.56-3.84 fl oz

Recommended for control of 1st and 2nd instars only. When applying by air, apply in a minimum of 2 gals of water/acre.
3 R

Warrior II w/
Zeon Technology

 lambda-cyhalothrin 1.28-1.92 fl oz