Archive image from page 9 of Defects in timber caused by. Defects in timber caused by insects defectsintimberc1490snyd Year: 1927 8 BULLETIN 1490, U. S. DEPARTMENT OF AGRICULTURE beetles or timber worms. In the former case (where caused by am- brosia beetles) the holes are made by both .the small, slender, cylin- drical, adult beetles, and, after hatching within the wood, by their Fig. U.—Pinholes made by the spruce timber beetle {Xyloterus bivittatus) in red spruce. West Virginia larvae or young. In the latter case the injury is caused entirely by the larvae or grubs (young) of beetles or

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Archive image from page 9 of Defects in timber caused by. Defects in timber caused by insects defectsintimberc1490snyd Year: 1927 8 BULLETIN 1490, U. S. DEPARTMENT OF AGRICULTURE beetles or timber worms. In the former case (where caused by am- brosia beetles) the holes are made by both .the small, slender, cylin- drical, adult beetles, and, after hatching within the wood, by their Fig. U.—Pinholes made by the spruce timber beetle {Xyloterus bivittatus) in red spruce. West Virginia larvae or young. In the latter case the injury is caused entirely by the larvae or grubs (young) of beetles or the so-called timber worms.

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