Douglas-fir needle midge

Douglas-fir needle midge larvae feed on Douglas-fir needles in spring, causing discoloration, stunting, and eventual needle loss. You will see reddened or brown needles starting in late spring, particularly on new growth at tree tops. Damage may make trees appear thin or sparse if infestations persist. This pest affects both landscape trees and native Douglas-firs across Western Washington.

No effective chemical control is practical for this midge in landscape settings. Maintain tree vigor through proper watering, especially during drought, to promote recovery from needle loss. Prune out dead branch tips after damage is evident to improve appearance. Most trees tolerate needle loss in upper portions well enough that no active management is required. Natural enemies usually suppress populations effectively without intervention.