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Definition of SPRUCE BUDWORM
: a tortricid moth (Choristoneura fumiferana) whose larva feeds on evergreen trees (as spruce and balsam fir) in the northern United States and Canada; also: a related moth (C. occidentalis) of the northwestern United States and adjacent Canada
First Known Use of SPRUCE BUDWORM
Larva of a leaf roller moth (Choristoneura fumiferana), one of the most destructive North American pests. It attacks evergreens, feeding on needles and pollen, and can completely defoliate spruce and related trees, causing much loss for the lumber industry and damaging landscapes.