Small grain-Sawfly

Pachynematus spp.

Pest description and crop damage Green, caterpillar-like larvae feed on foliage and developing heads. They have been found only on wheat, but they may attack other cereals. They rarely are sufficiently abundant to require control.

Management-chemical control

Foliar sprays

  • alpha-cypermethrin (Fastac EC) at 0.02 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.
  • beta-cyfluthrin (Baythroid XL) at 0.014 to 0.019 lb ai/a. PHI 30 days. REI 12 hr. Do not forage within 3 days of application. Retreatment interval 3 days. Do not exceed 0.038 lb ai/a per season.
  • chlorpyrifos/gamma-cyhalothrin (Cobalt) at 0.3 to 0.58 lb ai/a (wheat only). PHI 14 days forage and hay, 30 days grain and straw. REI 24 hr. Not more than 2 applications per year. Do not exceed 1 lb ai/a chlorpyrifos per season. Wheat only.
  • cyfluthrin (Tombstone) at 0.028 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 0.0125 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.
  • lambda-cyhalothrin (Silencer, Warrior II) at 0.025 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/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.
  • zeta-cypermethrin (Mustang) at 0.04 to 0.05 lb ai/a. PHI 14 days also for 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.