. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 142 THE SCOLYTID BEETLES. ECONOMIC FEATURES. It is said that this species prefers to attack the bark on the base of the trunks and roots of sound or healthy trees, and that the connect- ing of the broad larval chambers from the same egg gallery or from several galleries has the effect of girdling the tree, either causing its death or a weakened condition which attracts other barkbeetles to complete the destruction. Young as well as old trees are attacked, but, while this species will breed in standing injured or
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 142 THE SCOLYTID BEETLES. ECONOMIC FEATURES. It is said that this species prefers to attack the bark on the base of the trunks and roots of sound or healthy trees, and that the connect- ing of the broad larval chambers from the same egg gallery or from several galleries has the effect of girdling the tree, either causing its death or a weakened condition which attracts other barkbeetles to complete the destruction. Young as well as old trees are attacked, but, while this species will breed in standing injured or weakened trees, it rarely breeds in felled ones. It apparently prefers the spruces, but will, according to dif- ferent authors, attack pine, fir, and larch. The evidences of attack are masses of gum or resin and so- called pitch tubes, mixed with reddish boring dust. METHODS OF CONTROL. Removing the bark from the in- fested trunk and roots, or scorch- ing it if not removed, is recom- mended to kill the broods. Coat- ing the trunks of the trees with a preparation of tobacco water, Spanish blood, lime, fresh cow dung, etc., is recommended as a preventive. After the above was written the writer received a paper on the genus Dendroctonus from Dr. G. Severin (1908), director of the Royal Museum of Natural History of Belgium. A large series of specimens of the beetle and its work was also received from Doctor Severin, which was of special value and interest. Doctor Severin's paper covers the more impor- tant historic and economic information on the species recorded in European literature to 1908. Some of the information in the paper that is of special interest in connection with a discussion of all of the species is summarized as follows: Information from Paper on the Genus Dendroctonus, by Dr. G. Severin (1908, pp. 1-20). Dendroctonus micans alone, of all the hylesinids, and perhaps of all the scolytids, appears to love the resin and to live there with ease. It neglects the weak tre
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