Small grain-Cutworm and armyworm

Includes

Army cutworm (Chorizagrotis auxiliaris)
Variegated cutworm (Peridroma saucia and Euxoa spp.)
Wheat head armyworm (Faronta diffusa)

Pest description and crop damage Young plants often are damaged in early spring. Grain damaged by this insect was reported in recent years by barley and wheat growers in Washington and Idaho. Unfortunately, the damaged kernels were only detected after harvest. Infestations are usually too sporadic and isolated to justify any type of scouting or treatment program.

Management-chemical control

Foliar sprays

  • alpha-cypermethrin (Fastac EC) at 0.008 to 0.025 lb ai/a. PHI 14 days. REI 12 hr. Retreatment interval 14 days. Do not exceed 0.075 lb ai/a per season. Wheat and triticale.
  • azadirachtin (Aza-Direct, Ecozin 3EC) at 0.43 lb ai/a. PHI 1 day. REI 4 hr. Retreatment interval 7 days. Some formulations are OMRI-listed for organic use.
  • Bacillus thuringiensis kurstaki (Javelin) at 0.12 to 1.5 lb/a. OMRI-listed for organic use.
  • beta-cyfluthrin (Baythroid XL) at 0.008 to 0.019 lb ai/a. REI 12 hr. PHI 30 days. Do not forage or graze within 3 days of application. Retreatment interval 3 days. Do not exceed 0.038 lb ai/a per season.
  • Burkholderia spp. (Venerate XC) at 1 to 8 qt per acre. PHI 0 days. REI 4 hr. OMRI-listed for organic use.
  • chlorpyrifos (Lorsban Advanced) at 0.47 lb ai/a. PHI 14 days forage and hay; 28 days grain and straw. REI 24 hr. Do not exceed 2 treatments per acre per year (wheat only).
  • chlorpyrifos/gamma-cyhalothrin (Cobalt) at 0.3 to 0.58 lb ai/a (wheat only). REI 24 hr. PHI 14 days forage and hay, 30 days grain and straw. Not more than 2 applications per year. Do not exceed 1 lb ai/a chlorpyrifos per season. Wheat only.
  • Chromobacterium subtsugae (Grandevo) at 0.3 to 0.9 lb ai/a per 100 gal. PHI 0 days. REI 4 hr. OMRI-listed for organic use.
  • cyfluthrin (Tombstone) at 0.016 to 0.038 lb ai/a (wheat only). PHI 30 days. Pre-grazing or foraging interval 3 days. REI 12 hr. Retreatment interval 3 days. Do not exceed 0.076 lb ai/a per season.
  • gamma-cyhalothrin (Declare) at 0.0075 to 0.015 lb ai/a. PHI 30 days. REI 24 hr. Do not apply more than 0.03 lb ai/a per season. Do not graze or forage within 7 days of application. Do not feed straw within 30 days.
  • GS-omega/kappa-Hxtx-Hv1a (Spear Biological Insecticide) at 0.8 lb ai/a. PHI 0 days. REI 4 hr. Do not exceed 2 lb ai/a per year. Armyworms only. Wheat and barley only.
  • lambda-cyhalothrin (Silencer, Warrior II) at 0.015 to 0.03 lb ai/a. PHI 30 days. REI 24 hr. Do not graze or forage within 7 days of application. Do not feed straw within 30 days of last treatment. Do not exceed 0.06 lb ai/a per season.
  • lambda-cyhalothrin/tebuconazole (Crossover) at 0.14 lb ai/a. PHI 30 days. REI 24 hr. Do not exceed 0.33 lb ai/a per season. Feeding restrictions apply. Do not exceed 8 fl oz/a or 0.139 lb ai/a per season.
  • methomyl (Lannate SP) at 0.225 to 0.45 lb ai/a. PHI 7 days. REI 48 hr. Do not exceed 1.8 lb ai/a per season. Do not exceed 4 applications per season.
  • lambda-cyhalothrin/chlorantraniliprole (Besiege) at 0.049 to 0.078 lb ai/a. PHI 30 days. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.06 lb ai lambda-cyhalothrin or 0.2 lb ai chlorantraniliprole per year. Feeding restrictions.
  • lambda-cyhalothrin/thiamethoxam (Endigo ZC) at 0.056 to 0.072 lb ai/a. PHI 30 days. REI 24 hr. Retreatment interval 7 days. Do not exceed 0.06 lb ai/a lambda-cyhalothrin or 0.125 lb ai/a thiamethoxam per season. Barley only.
  • malathion (Gowan Malathion 8) at 1 to 1.25 lb ai/a. PHI 7 days. REI 12 hr. Retreatment interval 7 days. Limit 2 treatments per year.
  • pyrethrin-There are several pesticides containing various amounts of pyrethrins. Check each label for the use and amount needed.
  • spinetoram (Radiant SC) at 0.023 to 0.047 lb ai/a. Do not exceed 0.141 lb ai/a per year. Limit 3 applications per year. Retreatment interval 4 days. PHI 21 days for grain and straw; 3 days for forage, fodder, or hay harvest. REI 12 hr.
  • spinosad (Success, Entrust SC) at 0.047 to 0.094 lb ai/a. PHI 21 days for grain and straw; 3 days for forage, fodder or hay. REI 4 hr. Do not exceed 0.28 lb ai/a per year. Limit 3 treatments per year. Armyworms only. Entrust SC is OMRI-listed for organic use.
  • zeta-cypermethrin (Mustang) at 0.016 to 0.05 lb ai/a. PHI 14 days for grain, forage, and hay. REI 12 hr. Retreatment interval 14 days. Do not apply more than 0.25 lb ai/a per year. Barley, wheat and triticale only.
  • zeta-cypermethrin/chlorpyrifos (Stallion) at 0.089 to 0.28 lb ai/a. PHI for forage or hay 14 days; grain and straw 28 days. REI 24 hr. Retreatment interval 14 days. Do not allow meat or dairy animals to graze within 28 days of application. Do not exceed 0.05 lb ai/a zeta-cypermethrin or 0.5 lb ai/a chlorpyrfos per season. Wheat only.