Cooley Spruce Gall Adelgid Fact Sheet

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First instar nymph of Cooley spruce gall adelgid on Douglas-fir	Later instar nymph of Cooley spruce gall adelgid on Douglas-fir

Damage from feeding by Cooley spruce gall adelgid nymphs	Cooley spruce gall adelgid nymphs producing white waxy threads on Douglas-fir

Cooley Spruce Gall Adelgid galls on Colorado Blue Spruce