. Eastern forest insects. Forest insects. Xylotrechus obliteratus LeC, the poplar-butt borer, a serious pest of aspen and other poplars in the Rocky Mountain region, also occurs in many parts of eastern United States. The adult is dark-colored and about 10 to 18 mm. long. The thorax is crossed by yellow bands at the front and rear margins; the elytra are crossed by three yellow bands—the first one oblique, the middle one curved, and the last one transverse. Adults are present during late summer. Eggs are deposited in irregularities of the bark or exposed wood, and the larvae feed beneath the b
. Eastern forest insects. Forest insects. Xylotrechus obliteratus LeC, the poplar-butt borer, a serious pest of aspen and other poplars in the Rocky Mountain region, also occurs in many parts of eastern United States. The adult is dark-colored and about 10 to 18 mm. long. The thorax is crossed by yellow bands at the front and rear margins; the elytra are crossed by three yellow bands—the first one oblique, the middle one curved, and the last one transverse. Adults are present during late summer. Eggs are deposited in irregularities of the bark or exposed wood, and the larvae feed beneath the bark until fall. The following year they bore into the wood where they feed for several years, much of the time in parts of the tree below the ground line. Females continue to deposit eggs in the butts of infested trees until the wood is completely honeycombed and the tree dies or is broken by wind or ice. Xylotrechus sagittatus (Germ.) breeds in dead conifers in eastern Canada and the Northern States. In areas where pines predominate, it is especially common. Logs, slash and trees killed by fire or bark beetles are particularly attractive. Adults (fig. 69) are dark brown and about 18 mm. long. Each elytron is marked with variable stripes of fine gray hairs—one stripe along the sutural margin, one along the outer margin, and one at the apex. The larvae feed first beneath the bark, then they tunnel deep into the wood. The rustic borer, Xylotrechus colonics (F.), one of the com- monest of all cerambycids in eastern United States, feeds under the bark of almost all dead hardwoods. It occurs also in southern. ifSOfv N. 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 Baker, Whiteford L. (Whiteford Lee), 1903-. Washington : U. S. Dept. of Agriculture, Forest Service ; for sale by the Supt. of Docs. , U. S. G. P
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectforestinsects
