Orgyia pseudotsugata
Pest description and crop damage Mature larvae are about 1 inch long, hairy, gray or light brown, with black heads. Several light brown or cream-color tufts of hair are on the body. Defoliate trees. Also attacks Douglas-fir, true firs, pine, and larch.
See "Spruce" in:
Christmas Tree Plantation Pests
Management-chemical control
See: