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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

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 Stock Photo
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Contributor:

Actep Burstov / Alamy Stock Photo

Image ID:

W1R8XX

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5.7 MB (503.7 KB Compressed download)

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1174 x 1703 px | 19.9 x 28.8 cm | 7.8 x 11.4 inches | 150dpi

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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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