Vetch seed-Omnivorous leaftier

Cnephasia longana

Pest description and crop damage Yellowish brown larvae with a brown head and light stripes on each side of the back. They web terminal leaves and feed on terminal growth.

Management-chemical control

  • Bacillus thuringiensis (Bt)-PHI 0 days. REI 12 hr. Use as label directs. Some formulations are OMRI-listed for organic use.
  • malathion at 1 to 1.25 lb ai/a. PHI 7 days. REI 12 hr. Avoid applying spray on bloom. Malathion is toxic to all bees. If necessary to control pests when bloom is present, apply only in evening or early morning, when bees are not actively foraging in vetch. Always contact beekeeper before applying.
  • zeta-cypermethrin (Mustang MAX) at 0.014 to 0.025 lb ai/a. PHI 3 days for cutting or grazing, 7 days for hay and seed. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.025 lb ai/a per cutting nor 0.75 lb ai/a per season.