Western Bean Cutworm (Kansas Corn)

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

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


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



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

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