Pasture and grass hay-Thrips

Frankliniella spp. and other species

Pest description and crop damage On timothy hay or timothy-alfalfa mixed-stand hay crops only. Thrips scar and silver timothy and can reduce hay crop yield.

Management-chemical control

  • carbaryl (Sevin 4F) at 1 to 1.5 lb ai/a. PHI 14 days. Limit 2 treatments per year. Retreatment interval 14 days. Do not exceed 3 lb ai/a per year. REI 12 hr.
  • chlorantraniliprole+lambda-cyhalothrin (Besiege, Voliam Xpress) at 0.59 to 0.98 lb ai/a. PHI 0 days for grazing or cut for forage; 7 days for cut grass to be dried and harvested for hay. Retreatment interval 7 days. REI 12 hr. Do not exceed 0.09 lb ai/a lambda-cyhalothrin or 0.2 lb ai/a chlorantraniliprole.
  • gamma-cyhalothrin (Declare) at 0.01 to 0.015 lb ai/a. PHI 0 days for grazing or cut for forage; 7 days for cut grass to be dried and harvested. REI 24 hr. Do not exceed 0.045 lb ai/a per season.
  • lambda-cyhalothrin (Warrior II) at 0.02 to 0.03 lb ai/a. PHI 0 days for grazing and forage; 7 days to be dried for hay. REI 24 hr. Do not exceed 0.03 lb ai/a per cutting or 0.09 lb ai/a per season.