. Forest insect conditions in British Columbia [microform] : a preliminary survey. Insect pests; Arbres; Forest insects; Insectes nuisibles; Insectes forestiers; Trees. 80 This specieg is extremely abundant in Douglas fir slash tiiroughout the parts visited, and probably occurs throughout the range of its food-plant. Its normal habit IS to preferdying to breed in the barkof trunks and h rger branches of injured and dying treea, and in stumps and slash from cuttings Not rarely It spreads to healthy timber and may become a more or less serious enemy. It also breeds m Britich Columbia in


. Forest insect conditions in British Columbia [microform] : a preliminary survey. Insect pests; Arbres; Forest insects; Insectes nuisibles; Insectes forestiers; Trees. 80 This specieg is extremely abundant in Douglas fir slash tiiroughout the parts visited, and probably occurs throughout the range of its food-plant. Its normal habit IS to preferdying to breed in the barkof trunks and h rger branches of injured and dying treea, and in stumps and slash from cuttings Not rarely It spreads to healthy timber and may become a more or less serious enemy. It also breeds m Britich Columbia in the western larch. The adult is stout, reddish brown to nearly black, and 4 to 7 mm. in length. The pronotum is broader than long, with the sides rounded and strongly narrowed in front, irregularly punctured and hairy above. The elytra have*long hairs nearly to the base, with impr^ sed strite of punctures and roughened interspaces. It 18 readily distinguished from all other described species in British Columbia by the straight parallel sides of its epistomal process, and, practically, by its occur- rence in Douglas fir and western Fig. 14.—The DourIm Fir Bark-bwtle. (Dendroclonun pneudoUugae Hopk.) Greatly enluigcd. (Original). LiKE-nisTORV AND HABiib.—The adults enuTge from the old bark during the spring and early summer and attack dying or healthy bark in pairs They enter usually through the thinner places, or bark fissures, and excavate eioiiRate rather straight tunnels between the bark and wood surface, upward from the entrance hole. The female deposits eggs singly in shallow niches cut in alternately on the sides of the egg-tunnel and covers all with a layer of borinK-dfst which later largely fills the egg-tunntls. The larva- cut thcir'galleries througii the inner bark, away from the egg-tunnel, leaving the wide, long and often rather straight larval galleries packed with concentric layers of reddish boring-dust The larva.' enlarge the ends of the gall


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Keywords: ., bookcentury1900, bookdecade1910, bookpubl, booksubjectinsectpests