. Eastern forest insects. Forest insects. The pales weevel has been the subject of considerable interest for many years, and several publications on its biology, ecology, and control have been issued (24-5, 589, 682). The pine root collar weevil, Hylobius radicis Buch., breeds in the root collars of healthy pines in southern Canada from New- foundland to Manitoba and in all of the Northeastern States south to Virginia and west to Minnesota. Of its hosts, Scotch pine seems to be the most severely damaged; but jack, red, Austrian, eastern white, pitch, and mugho pines are also attacked. The adul
. Eastern forest insects. Forest insects. The pales weevel has been the subject of considerable interest for many years, and several publications on its biology, ecology, and control have been issued (24-5, 589, 682). The pine root collar weevil, Hylobius radicis Buch., breeds in the root collars of healthy pines in southern Canada from New- foundland to Manitoba and in all of the Northeastern States south to Virginia and west to Minnesota. Of its hosts, Scotch pine seems to be the most severely damaged; but jack, red, Austrian, eastern white, pitch, and mugho pines are also attacked. The adult (fig. 78) is dark reddish-brown to black and about 10 to 12 mm. long. It is marked with irregular patches of white-to-yellow hairlike scales, and the elytra have longitudinal rows of elongated indentations. In most localities, eggs are deposited from early May to late September in cavities in the inner bark at the base of the tree, or in the soil nearby (64>0). The larvae feed downward in the inner bark of the base of the trunk and in the bases of large roots below the ground line, widening their galleries as they develop. Galleries are also formed in the soil around the base. The follow- ing winter is spent in the larval stage in the Lake States. In Southern Ontario, it is spent in the larval and adult stages and occasionally in the pupal stage (2U6). Pupation occurs from June to September in cells constructed in the soil. Adults appear from August to October but do very little egg laying before entering the soil or bark crevices where they spend the winter. When they emerge in the spring, they feed during the day on the bark of duff-covered branches, mate, and lay eggs. During warm evenings, they feed on the bark of the upper branches and fly to other trees. Most of these adults overwinter a second time and then are active for part of the following season (785). Heavily infested trees may be severely injured (fig. 79). Small trees, from 1 to 4 inches in diameter are most
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectforestinsects
