Small grain-Brown wheat mite

Petrobia latens

Pest description and crop damage Young mites are red-orange; later, they become dark brown. Feeding gives foliage a mottled appearance and stunts plants. It has been a problem primarily on barley, but it also attacks wheat and other small grains, ryegrass, some legumes, onions, and carrots.

Management-chemical control

Foliar sprays

  • chlorpyrifos (Lorsban Advanced) at 0.23 to 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 0.16 to 0.3 lb ai/a. 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 0.6 to 0.9 lb ai/a per 100 gal. 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. Wheat only.
  • gamma-cyhalothrin (Declare) at 0.015 lb ai/a. PHI 30 days. REI 24 hr. Maximum 0.03 lb ai/a per season. Suppression only. Do not graze or forage within 7 days of application. Do not feed straw within 30 days.
  • lambda-cyhalothrin (Silencer, Warrior II) at 0.03 lb ai/a. Suppression only. 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.