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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.
This entry comes from Encyclopædia Britannica Concise. For the full entry on spruce budworm, visit Britannica.com.