Vetch hay-Omnivorous leaftier

Cnephasia longana

Pest description and crop damage Yellow spindle-shaped larvae with brown heads and light stripes on each side of the back. They web and feed within terminal leaves.

Management-chemical control

  • Bacillus thuringiensis (Javelin WG) at 0.5 to 1.5 lb/a. PHI 0 days. REI 4 hr. Addition of a spreader sticker may improve performance. Some formulations are OMRI-listed for organic use.
  • malathion (Drexel Malathion 5EC) at 0.625 to 1.25 lb ai/a. PHI 0 days. Retreatment interval 14 days. REI 12 hr. Limit 2 treatments per cutting.
  • methoxyfenozide (Intrepid 2F) at 0.06 to 0.16 lb ai/a. PHI 0 days graze, 7 days hay. REI 4 hr. Do not exceed 0.5 lbs ai/a/yr. Limit 1 treatment per cutting.
  • zeta-cypermethrin (Mustang) at 0.028 to 0.05 lb ai/a. PHI 3 days for cutting or grazing, 7 days hay. REI 12 hr. Retreatment interval 7 days. Do not exceed 0.05 lb ai/a per cutting nor 0.15 lb ai/a/season.