Scouting time
Corn earworm damage to soybeans occurs from August through September. Larvae feed on pods consuming the developing seeds. Fields should be scouted for small larvae beginning at bloom.
Sampling method
Observe a foot row of plant canopy for caterpillar presence.
Thresholds
Control measures should be implemented when an average of one small caterpillar per foot of row is detected.
Chemical control
|
Insecticide |
Rate |
|
Acetamiprid plus bifenthrin (Justice) |
0.0351 to 0.0422 lbs. a.i./acre (2.5 to 3.0 fl. oz./acre) |
|
Alpha-cypermethrin (Fastac EC) |
2.8 to 3.8 fl. oz./acre |
|
Beta-cyfluthrin (Baythroid XL) |
0.013 to 0.022 lbs. a.i./acre (1.6 to 2.8 fl. oz.) |
|
Bifenthrin plus imidacloprid (Tempest) |
0.08 to 0.095 lbs. a.i./acre (5.1 to 6.1 fl. oz./acre) |
|
Carbaryl 4L (Sevin) |
.5 - 1.5 qts/acre |
|
Chlorantraniliprole (Prevathon) |
14.0 to 20.0 fl. oz./acre |
|
Chloropyrifos (Lorsban 4E) |
1 to 2 pints/acre |
|
Chloropyrifos plus gamma-cyhalothrin (Cobalt) |
19 to 38 fl. oz. of product/acre |
|
Chloropyrifos plus zeta-cypermethrin (Stallion) |
9.25 to 11.75 fl. oz./acre |
|
Cyfluthrin (Tombstone) |
0.025 to 0.044 lb. a.i./acre (1.6 to 2.8 fl. oz./acre) |
|
Deltamethrin (Delta Gold) |
0.012 to 0.018 lbs. a.i./acre (1 to 1.5 fl. oz.) |
|
Esfenvalerate (Asana XL 0.66) |
0.03 to 0.05 lb. a.i./acre (5.8 to 9.6 fl. oz.) |
|
Flubendiamide (Belt) |
2.0 to 3.0 fl. oz./acre |
|
Gamma-cyhalothrin (Proaxis) |
0.0075 to 0.0125 lb. a.i./acre (1.92 to 3.20 fl. oz.) |
|
Imidacloprid plus cyfluthrin (Leverage) |
3.8 fl. oz./acre |
|
Indoxacarb (Steward 1.5 SC) |
0.045 to 0.11 lb. a.i./acre (5.6 to 11.3 fl. oz.) |
|
Lambda-cyhalothrin (Warrior w/ Zeon Technology) |
0.015 to 0.025 lb. a.i./acre |
|
Lambda-cyhalothrin chlorantraniliprole (Besiege) |
5.0 to 8.0 fl. oz./acre |
|
Lambda-cyhalothrin plus thiamethoxam (Endigo ZC) |
3.5 to 4.0 fl. oz./acre |
|
Methomyl (Lannate LV) |
2/5 - 3/4 pint/acre |
|
Permethrin (Pounce 25 WP) |
6.4 to 12.8 ounces (0.1 to 0.2 pound active) per acre |
|
Spinosad (Tracer) |
1.5 to 2 fl. oz./acre |
|
Zeta-cypermethrin (Mustang MAXX, etc.) |
0.0175 to 0.025 lb. a.i./acre (2.8 to 4.0 fl. oz.) |
|
Zeta-cypermethrin plus bifenthrin (Hero) |
4.0 to 10.3 fl. oz. of product/acre |
Non-chemical controls
None listed.
Content authors
Disclaimers
This information comes from the Kansas State University Agricultural Experiment Station and Cooperative Extension Service publication MF743. Information may not be suitable for states other than Kansas.
