Dry edible and seed pea-Pea weevil

Bruchus pisorum

Pest description and crop damage A small, grayish-brown weevil 0.2 inch long, marked with dark and light spots. Larvae feed within the seed and destroy its viability.

Sampling and thresholds Usually, one weevil per 25 sweeps of an insect net will result in weevil infested peas at harvest.

Management-chemical control

Apply insecticides to kill adults before they lay eggs. Once eggs are on pods, it is too late to prevent infested seeds. Therefore, apply insecticide when first pods appear and before eggs are laid.

  • alpha-cypermethrin (Fastac EC) at 0.017 to 0.025 lb ai/A. PHI 21 days. REI 4 hr. Retreatment interval 5 days.
  • carbaryl (Carbaryl 4L) at 0.75 lb ai/A. PHI 14 days for grazing or harvest for forage, 21 days for harvest. Do not exceed 6 lb ai/A per season. Retreatment interval 7 days. REI 12 hr.
  • cyfluthrin (Tombstone Helios) at 0.038 to 0.050 lb ai/A. PHI 7 days. REI 12 hr. Retreatment interval 14 days. Do not exceed 0.1 lb ai/A per year.
  • phosmet (Imidan 70W) at 0.7 to 1 lb ai/A. PHI 7 to 10 days. REI 5 days. Do not exceed 2.8 lb ai/A per season. Do not feed forage to livestock within 7 days. Do not cut treated fresh pea forage for hay within 10 days.

These products contain commonly used active ingredients for control of pea weevil in dry edible and seed pea. There are other materials available. Please consult a licensed crop advisor for additional recommendations.