Tetropium velutinum (Cerambycidae)
Larvae:White, elongate, elyptical in cross-section. Narrow thorax. Small thoracic legs present. Segments distinct. Body not strongly tapered.
Damage:Common in fire killed timber, cold deck piles left over summer, drought weakened and insect defoliated trees. Larva is a shallow sapwood borer and bark miner. The larva do enter the wood to pupate. The holes left in the wood are elliptical in cross-section and adult exist holes are circular.
Western larch, Douglas-fir and western hemlock are the preferred hosts. Species
of Abies, Pinus and Picea are recorded hosts.
During the drought of the 1930's this species caused extensive deterioration
of larch stands in N.W. Washington.
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