Insecticide Treatment Options for Corn Leaf Aphids in Field Corn

Updated February 15, 2017

Economic Thresholds
(Purdue University)
Number of Days
Before Tasseling		 Crop Condition Number of Aphids
Per Plant
21Normal15
21Stressed10
14Normal30
14Stressed15

During pollen-shed, aphids may interfere with pollen-shed if they are abundant on the tassels due to their secretions of sticky honeydew.
If greater than 50% of the tassels are covered with aphids and their honeydew prior to 50% completion of pollination, control may be needed.

Go to https://www.greenbook.net or other resource for additional registrations.
*Consult product 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 4 = Nicotinic acetylcholine receptor agonists/antagonists; 4A = Neonicotinoids
  • Group 28 = Ryanodine receptor modulators, Diamides
R = Restricted-Use Product

Mode Of
Action
Product
Name
Common
Name
Rate
(Formulation/Acre)
Restrictions/Comments
3 Arctic 3.2EC permethrin 4-6 fl oz PHI 30 days for grain or fodder.
3 Asana XL esfenvalerate 5.8-9.6 fl oz PHI 21 days. Direct the spray at the aphid populations so as to achieve maximum coverage of the exposed insects.
3, 28 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. *Suppression only.
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 Cobalt chlorpyrifos and
gamma cyhalothrin		 13-26 fl oz PHI 21 days for grain, ears, forage or fodder.
1B, 3 Cobalt Advanced chlorpyrifos and
gamma cyhalothrin		 11-26 fl oz PHI 21 days for grain, ears, forage or fodder.
1B Dimethoate 4EC dimethoate 2/3-1 pt PHI 28 days for grain. PHI 14 days for forage. Do not apply during pollen-shed if bees are present.
3 Fastac EC alpha-cypermethrin 2.7-3.8 fl oz PHI 30 days for grain and stover. PHI 60 days for forage.
3 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 0.75-1.5 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 Lorsban Advanced,
Lorsban 4E,
Govern 4E,
Hatchet,
Nufos 4E,
Warhawk,
Yuma 4E		 chlorpyrifos 1-2 pts PHI 21 days before harvest of grain, ears, forage or fodder.
1B Malathion 8 malathion 0.61 pt PHI 7 days. Caution: injury may occur in whorl and silk stages.
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 2.72-4.0 fl oz PHI 30 days for grain and stover. PHI 60 days for forage.
1B R Penncap-M microencapsulated
methyl parathion		 2-3 pts PHI 12 days for harvest, forage and grazing.
4A Poncho/Votivo clothianidin 0.5 mg ai/kernel A systemic insecticide and biological seed treatment for control of listed insect pests and protection from listed soil plant pathogenic nematodes. Use planting equipment that will plant treated seed into the soil to a minimum depth of 0.5 inch.
4D  Sivanto 200 SL flupyradiflurone 7.0-10.5 fl oz PHI 21 days for grain or stover and 7 days for forage.
1B, 3 Stallion chlorpyrifos +
zeta-cypermethrin		 9.25-11.75 fl oz PHI 30 days for grain or stover and 60 days for forage.
3 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.