. An annotated list of the important North American forest insects. Forest insects. Fig. 16.—Pinholes caused by the oak timber ' worm (Eupsalis minuta), which causes tlie defect classed in the grade " sound wormy oak " PINHOLES IX FELLED TRB:E'" CAUSED BY AMBROSIA BEIETLES In sapwood or heartwood of white oak, chestnut, yellow poplar,^ birch, beech, and sweet gum the pinholes caused by ambrosia beetles are about one-twelfth of an inch in diameter, open, usually isolated, and always accompanied by long, discolored streaks in tlie surround- ing wood. Lumber with such defects is re
. An annotated list of the important North American forest insects. Forest insects. Fig. 16.—Pinholes caused by the oak timber ' worm (Eupsalis minuta), which causes tlie defect classed in the grade " sound wormy oak " PINHOLES IX FELLED TRB:E'" CAUSED BY AMBROSIA BEIETLES In sapwood or heartwood of white oak, chestnut, yellow poplar,^ birch, beech, and sweet gum the pinholes caused by ambrosia beetles are about one-twelfth of an inch in diameter, open, usually isolated, and always accompanied by long, discolored streaks in tlie surround- ing wood. Lumber with such defects is rejected for the higher srrades. Strongylimn spp. 'The adult of Corthylus columbianus Hopkins causes pinlioU-s in hardwoods wiUi wnicu discolored streaks are 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. O. (Leland Ossian), 1857-1950; Chittenden, F. H. (Frank Hurlbut), 1858-1929; St. George, R. A. (Raymond Alexander), b. 1894; Beal, J. A; Middleton, William, b. 1893; Burgess, A. F; Busck, August, 1870-1944; Carl A. Schenck Collection (North Carolina State University) NCRS. [Washington, D. C. : s. n.
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Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1900, bookdecade1900
