SPRUCE SPIDER MITES. Spruce spider mites are “cool season”

mites commonly found feeding on fir, arborvitae, spruce,

Douglas-fir, and other conifers. Their sucking mouthparts cause

bleaching, yellowing, stippling or bronzing of the needles.

Spruce Spider Mite Pictures from USDA Forest Service – Region 4 Archive, USDA Forest Service, Bugwood.org