Scouting time
Begin field scouting at the first sign of tasseling and continue until
silks turn brown. Typically, scouting should be concentrated
between July 18 and 30 in southwest Kansas and about a week later in northwest
Kansas.
Sampling method
Look for round, white eggs in groups of 5 to 200 on the upper
surface of upper leaves. Eggs gradually become darker in color
Thresholds
An average of eight plants with eggs or small larvae per 100 plants (when
corn is 95 percent tasseled) is required to justify control measures.
Chemical control
|
Insecticide |
Rate |
|
Alpha-cypermethrin (Fastac EC) |
1.8 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 (numerous products) |
0.033 to 0.10 lb. a.i./acre (2.1 to 6.4 fl. oz.) |
|
Carbaryl 4L (Sevin) |
2 quarts/acre |
|
Chlorantraniliprole (Prevathon) |
14.0 to 20.0 fl.oz./acre |
|
Chlorpyrifos (numerous products) |
Check label, but generally 1 to 2 pints/acre |
|
Chlorpyrifos plus gamma-cyhalothrin (Cobalt) |
13 to 26 fl. oz. of product/acre |
|
Chlorpyrifos plus zeta-cypermethrin (Stallion)* |
5.0 to 11.75 oz./acre |
|
Cyfluthrin (Tombstone) |
0.025 to 0.044 lb. a.i./acre (1.6 to 2.8 fl. oz.) |
|
Esfenvalerate (Adjourn) |
0.015 to 0.03 lb. a.i./acre (2.9 to 5.8 fl. oz.) |
|
Flubendiamide (Belt SC) |
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.) |
|
Lambda-cyhalothrin (Warrior w/ Zeon Technology) |
0.015 to 0.025 lb. of a.i./acre (1.92–3.20 fl. oz./A) |
|
Lambda-cyhalothrin plus chlorantraniliprole (Besiege) |
5.0 to 10.0 fl. oz./acre |
|
Methoxyfenozide (Intrepid 2F) |
4 – 16 fl oz/Acre (0.06 – 0.25 lb ai/acre) |
|
Permethrin (Pounce 25WP) |
0.05 to 0.1 lb. a.i./acre (3.2 to 6.4 ounces) |
|
Spinosad (Tracer) |
2 to 3 fl. oz./acre |
|
Zeta-cypermethrin (Mustang MAXX, etc.) |
0.011 to 0.025 lb. a.i./acre (1.76 to 4.0 fl. oz.) |
|
Zeta-cypermethrin + Bifenthrin (Hero) |
2.6 to 6.1 fl. oz. of product/acre |
*For control before the larva bores into the plant stalk or ear
Content authors
Disclaimers
This content may not be suitable for states other than Kansas.
