Frankliniella occidentalis
Pest description and crop damage Adults are yellow to yellow-brown, 0.05 inch long, narrow, with wings. Larvae are smaller and wingless. Both stages feed on developing growth causing leaf distortion and black necrotic tissue. Most damage occurs when thrips disperse as nearby grass fields are harvested in the summer.
Management-chemical control
See:
Chemical Control of Nursery Pests
For more information
PNW Nursery IPM: Thrips (http://oregonstate.edu/dept/nurspest/thrips.htm)