. Defects in timber caused by insects. Wood; Forest insects. DEFECTS IN TIMBER CAUSED BY INSECTS. Fig. -Pinholes caused by the pine-wood stainer (Onathot)ichus materiarius) POWDER POST Powder post is that class of defects in which the larvae of insects reduce the wood 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 at
. Defects in timber caused by insects. Wood; Forest insects. DEFECTS IN TIMBER CAUSED BY INSECTS. Fig. -Pinholes caused by the pine-wood stainer (Onathot)ichus materiarius) POWDER POST Powder post is that class of defects in which the larvae of insects reduce the wood 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 boring dust and is called powder-posted. This type 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 with 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 by either ambrosia FlG" 5--pinholes ^Jl^f s£ouslas 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 Snyder, Thomas Elliott, b. 1885. Washington, D. C. : U. S. Dept. of Agriculture
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherwa, booksubjectwood
