. An annotated list of the important North American forest insects. 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 25i"6 venting them. Data contained in earlier bulletins by exj^erts of this bu- reau, as Avell as new and unpublished data,
. An annotated list of the important North American forest insects. 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 25i"6 venting them. Data contained in earlier bulletins by exj^erts of this bu- reau, as Avell as new and unpublished data, have been used freely in this bulletin. The published articles by Hopkins {2J, '24, 25, 26, 27, 28, 29, 30, 3U 32, 33, 34, 35), Burke (^,7), Webb {50,51), Craighead {9, 10, 11, 12, 13, 14), Snyder and '^), 44-) 4^') 4^ St. George (^7) 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 {H). Timber inspectors and graders should be able to determine from the caused by insects workine;. Fi(i. 1.—Black lioli's in wliiii- cohiiiihianus. A, slightly lUlar; ml; i;i,wi.' liv Cortln/his ?d ; D, sliglaily reduced defect in the wood whether it was 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 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 Del
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Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1900, bookdecade1900
