Maple (Acer)-Western flower thrips

Frankliniella occidentalis

Description, biology and 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 to maple occurs when thrips disperse from grass fields when they are mowed or harvested in the summer.

For biology, life history, monitoring and management

See "Thrips" in:

Management-chemical contro

See Table 2 1 in:

For more information

Rosetta, R. 2008. Western flower thrips. PNW Nursery IPM (

Terry, I., E.H. Beers and S. Cockfield. 2007. Western flower thrips. (