Field and silage corn-Grasshopper

Several species

Pest description and crop damage Have caused extensive defoliation during some years.

Management-chemical control

  • alpha-cypermethrin (Fastac EC) at 0.017 to 0.025 lb ai/a. REI 12 hr. PHI 30 days grain and stover; 60 days forage. Retreatment interval 3 days. Do not exceed 0.075 lb ai/a per season.
  • azadirachtin (Neemix)-PHI 0 days. REI 12 hr. See label for rates. Slow acting. Apply early. Thorough coverage and repeat applications are necessary. Some formulations are OMRI-listed for organic use.
  • beta-cyfluthrin (Baythroid XL) at 0.017 to 0.022 lb ai/a. PHI 0 days for green forage and 21 days for fodder or grain. REI 12 hr. Do not exceed 0.088 lb ai/a per season.
  • bifenthrin (Brigade 2EC) at 0.033 to 0.1 lb ai/a. PHI 30 days for harvest, grazing, or cutting for feed. REI 12 hr. Do not apply more than 0.3 lb ai/a per season.
  • bifenthrin/zeta-cypermethrin (Hero) at 0.025 to 0.06 lb ai/a. PHI 30 days grain and stover; 60 days forage. REI 12 hr. Do not graze for 30 days after treatment. Do not exceed 0.4 lb ai/a per season.
  • carbaryl (Sevin 5 Bait) at 2 lb ai/a. PHI 14 days for forage or silage or 48 days for grain or fodder. REI 24 hr. Do not exceed four applications per season. Retreatments every 14 days.
  • chlorantraniliprole (Coragen) at 0.026 to 0.065 lb ai/a. PHI 14 days. REI 4 hr. Do not exceed 4 treatments nor 0.2 lb ai/a per season. Retreatment interval 7 days.
  • chlorantraniliprole/lambda-cyhalothrin (Besiege) at 0.059 to 0.098 lb ai/a. PHI 21 days. REI 24 hr. Do not exceed 0.12 lb ai of lambda-cyhalothrin or 0.2 lb ai of chlorantraniliprole per acre per growing season. Retreatment interval 7 days.
  • cyfluthrin (Tombstone) at 0.033 to 0.044 lb ai/a. PHI 0 days for green forage and 21 days for grain or fodder. REI 12 hr. Retreatment interval 7 days. Do not exceed four applications or 0.175 lb ai/a per season.
  • deltamethrin (Delta Gold) at 0.012 to 0.018 lb ai/a. PHI 21 days for grain or fodder or 12 days for forage or grazing. REI 12 hr. Retreatment interval is 21 days. Do not exceed 0.095 lb ai/a per season. Limit 5 treatments per year.
  • dimethoate (Dimethoate 400) at 0.5 lb ai/a. PHI 14 days forage; 28 days grain. REI 48 hr. Do not exceed 0.5 lb ai/a per season.
  • esfenvalerate (Asana XL) at 0.03 to 0.05 lb ai/a. PHI 21 days. REI 12 hr. Do not exceed 0.25 lb ai/a per season.
  • gamma-cyhalothrin (Declare) at 0.01 to 0.015 lb ai/a. PHI 1 day for grazing and forage, or 21 days for fodder and silage. REI 24 hr. Do not exceed 0.06 lb ai/a per season.
  • lambda-cyhalothrin (Warrior II) at 0.02 to 0.03 lb ai/a. PHI 21 days. REI 24 hr. Do not apply more than 0.12 lb ai/a per season, 0.06 lb ai/a after silk initiation, or 0.03 lb ai/a after milk stage.
  • malathion (Gowan Malathion 8, Fyfanon 8) at 0.6 to 1 lb ai/a. PHI 5 days. REI 12 hr. Limit 2 treatments per year. Retreatment interval 7 days.
  • tebuconazole/lambda-cyhalothrin (Crossover) at 0.14 to 0.16 lb ai/a. PHI 21 days fodder and silage. REI 24 hr. Retreatment interval 7 days. Do not exceed 0.48 lb ai/a tebuconazole or 0.12 lb ai/a lambda-cyhalothrin per season.
  • zeta-cypermethrin (Mustang) at 0.034 to 0.05 lb ai/a. PHI 7 days for grain, stover and forage. REI 12 hr. Do not exceed 0.2 lb ai/a per season. Retreatment interval 3 days.