. Defects in timber caused by insects. Wood; Forest insects. DEFECTS IN TIMBER CAUSED BY INSECTS In order to accomplish this saving it is necessary for manufac- turers of wood products to utilize all available information that has been obtained from experiments carried on for many years by the Bureau of Ento- mology, especially the results of scientific re- search on the specific causes of the differ- ent types of insect defects and methods of preventing them. Data contained in earlier bulletins by experts of this bu- reau, as well as new and unpublished data, have been used freely in this bul
. Defects in timber caused by insects. Wood; Forest insects. DEFECTS IN TIMBER CAUSED BY INSECTS In order to accomplish this saving it is necessary for manufac- turers of wood products to utilize all available information that has been obtained from experiments carried on for many years by the Bureau of Ento- mology, especially the results of scientific re- search on the specific causes of the differ- ent types of insect defects and methods of preventing them. Data contained in earlier bulletins by experts of this bu- reau, as well as new and unpublished data, have been used freely in this bulletin. The published articles by Hopkins (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35), Burke (6,7), Webb (50,51), Craighead (9, 10, 11, 12, 13, 14), Snyder (43, 44, 45, 46, 47), and St. George (41) were the source of much information. The pioneer investi- gations and publica- tions of Doctor Hop- kins, former forest entomologist of the Department of Agri- culture, in reality form the basis for this bulletin. Doctor Hopkins's investiga- tions have done much to prevent waste and losses due to insects. References to these and many other pub- lications are to be found in Chamber- lin (8). Timber inspectors and graders should be able to determine from the defect in the wood whether it was caused by insects working in (1) the living tree; (2) the freshly felled, green saw log or bolt, with or without the bark on; (3) the green,unseasoned lumber; or (4) seasoned rough or finished Fig. 1.—Black columhianus. holes in white oak A, slightly enlarged ; made by CortJiylns B, slightly reduced. 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
