. Defects in timber caused by insects. Wood; Forest insects. 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 Please note that these images are extracte
. Defects in timber caused by insects. Wood; Forest insects. 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 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Snyder, Thomas Elliott, b. 1885. Washington, D. C. : U. S. Dept. of Agriculture
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherwa, booksubjectwood
