Some insects injurious to forests . Work of the Western Pine-destroying Barkbeetle, Removedfrom Killed Tree. Original.) THK WESTERN PINE-DESTROYING BARKBEETLE. 19. Fig. 6.—The western pine-destroying barkbeetle [Dendroctonus brevi- amu): Galleries in the inner bark. (; sorrel tops/ and the dead ones, with reddish-brown foliage, arecalled ured tops/ or, if with bare branches or broken tops, arc known as black tops or broken top-: (2) by small masses of resin(pitch tubes, and 12, c) inthe crevices of thebark of recentlyattacked livingtrees, as well asin those of thedying and
Some insects injurious to forests . Work of the Western Pine-destroying Barkbeetle, Removedfrom Killed Tree. Original.) THK WESTERN PINE-DESTROYING BARKBEETLE. 19. Fig. 6.—The western pine-destroying barkbeetle [Dendroctonus brevi- amu): Galleries in the inner bark. (; sorrel tops/ and the dead ones, with reddish-brown foliage, arecalled ured tops/ or, if with bare branches or broken tops, arc known as black tops or broken top-: (2) by small masses of resin(pitch tubes, and 12, c) inthe crevices of thebark of recentlyattacked livingtrees, as well asin those of thedying and deadones; and (3) thepresence of thespecies is deter-mined by remov-ing the bark fromthe dying and dead trees and finding the characteristic galleries ( and Pis. II, III). It must be remembered, however, that there are many differentkinds of insects, some of them closely resembling the destructivespecies, always found in dying pine trees. Therefore, for the generalobserver to be positive in the matter, specimens of insects and workshould be sent to the Bureau of Entomology for authentic identifi-cation. DISTRIBUTION. The insect is found in southern I
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1910
