Small grain-Brown wheat mite

Petrobia latens

Pest description and crop damage Young mites are red-orange; later, they become dark brown with lighter colored legs. The front legs are usually held straight in front, elongated and almost twice as long as the other legs. Feeding gives foliage a mottled appearance and stunts plants. It has been a problem primarily in barley, but it could also attack wheat and other small grains, ryegrass, some legumes, onions, and carrots.

Management-chemical control

Foliar spray

  • Chromobacterium subtsugae (Grandevo WDG) at 0.6 to 0.9 lb ai/A. PHI 0 days. REI 4 hr. OMRI-listed for organic use.
  • dimethoate (Dimethoate 400) at 0.16 to 0.25 lb ai/A. PHI 35 days. REI 48 hr. Do not exceed 0.5 lb ai/A per season. Ground water advisory. Wheat only.
  • gamma-cyhalothrin (Declare) at 0.015 lb ai/A. PHI 30 days, 7 days for grazing or foraging. REI 24 hr. Do not exceed 0.03 lb ai/A per season. Suppression only.
  • lambda-cyhalothrin (Silencer, Warrior II) at 0.03 lb ai/A. PHI 30 days, 7 days for grazing or foraging. REI 24 hr. Do not exceed 0.06 lb ai/A per season. Suppression only.
  • lambda-cyhalothrin/chlorantraniliprole (Besiege) at 0.098 lb ai/A. PHI 30 days, 7 days for grazing or foraging. REI 24 hr. Retreatment interval 7 days. Do not exceed 0.06 lb ai lambda-cyhalothrin or 0.2 lb ai chlorantraniliprole per year. Make no more than 4 applications per acre per crop.
  • lambda-cyhalothrin/thiamethoxam (Endigo ZC) at 0.072 lb ai/A. PHI 30 days, 7 days for grazing or foraging. 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. Groundwater advisory. Barley only.