Douglas-fir needle midge
Contarinia pseudotsugae
4 host plants
Last updated
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.
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.
Quick Reference
Cultural Controls
- Where practical, prune out heavily infested twigs.
- Use emergence traps on the ground to catch adults.
- This will help determine the need for control.
- Contact your county Extension agent for further information.