The eastern spruce gall adelgid is a key pest of Norway spruce in northeastern United States. Occasionally, it also infests white spruce, red spruce, and Colorado blue spruce. The galls formed by this pest are short, pineapple-shaped growths. Feeding stimulates the formation of a gall at the base of current year’s growth. Infested trees are seldom killed, but the aesthetics of an infested tree may be greatly reduced. Well-timed spray treatments are very effective.