Pest description and crop damage Yellowish brown larvae with brown heads and light longitudinal stripes on each side of the back. They web terminal leaves and feed on new growth. Damage is in May and June. There is one generation per year. They seldom are a problem except in the Willamette Valley of Oregon.
- Bacillus thuringiensis (Bt)-Use as label directs. Some formulations are OMRI-listed for organic production.