. An annotated list of the important North American forest insects. Forest insects. Fig. -Pinholes caused by the pine-wood staincr (Gnathotiichus materiarius) POWDER POST Powder post is that class of defects in which the larvae of insects reduce the Avood fibers of seasoned or partially seasoned wood to a powderlike condition by boring through the wood, which is both their shelter and their food. Powder post occurs only in the seasoned or partially seasoned sap- wood or heartwood of both hardwoods and softwoods. Logs, bolts, timbers, lumber, and crude or finished prod- ucts are attacked. The i
. An annotated list of the important North American forest insects. Forest insects. Fig. -Pinholes caused by the pine-wood staincr (Gnathotiichus materiarius) POWDER POST Powder post is that class of defects in which the larvae of insects reduce the Avood fibers of seasoned or partially seasoned wood to a powderlike condition by boring through the wood, which is both their shelter and their food. Powder post occurs only in the seasoned or partially seasoned sap- wood or heartwood of both hardwoods and softwoods. Logs, bolts, timbers, lumber, and crude or finished prod- ucts are attacked. The infested wood is al- ways more or less filled with fine or coarse powdery or granulated laoring dust and is called powder-posted. This tjY'Q' of injury is dangerous, since the grubs continue their destructive work in the wood and also infest other timber near by. DEFECTS CLASSED AS PINHOLES The term " pinholes " undoubtedly origi- nated w^ith stave mak- ers and coopers, from the fact that such holes are often plugged with small wooden pins. Pinholes are small, round holes one one- hundredth to one- fourth of an inch in diameter in both the heartwood and sap- wood of hard (broad- leafed) and soft (co- niferous) living trees, green, moist saw logs, bolts, green timbers, or green piled lumber. These holes are made 1 1 • B^iG. 5.—Pinholes in sapwood Dou; by either ambrosia xyioterua jlas fir made by. 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 Craighead, Frank C. (Frank Cooper), 1890-; Perry, George S; Snyder, Thomas Elliott, b. 1885; Hopkins, A. D. (Andrew Delmar), 1857-1948; MacAloney, Harvey John, 1896-; Graham, Samuel Alexander, 1891-; Peirson, Henry Byron, 1894-; Herrick, Glenn W. (Glenn Washington), 1870-1965; Britton, Wilton Everett, 1868-1939; Tanaka, T; Sanders, J. G; Howard, L
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Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1900, bookdecade1900
