. Forest insect conditions in British Columbia [microform] : a preliminary survey. Insect pests; Arbres; Forest insects; Insectes nuisibles; Insectes forestiers; Trees. 11 Throughout the Okanagan and Similkameen many bull pines are stag- headed. All such cases examined had been caused by bark-boring caterpillars destroying the inner bark in patches about the trunk and bases of the branches, working downwards from the top. These dead tops were covered with resin, and perfectly Fig. 1—Galls ot the Sitka .'Spruce Gall Aphm, on Sitka Spiucc: Stanley Park, Vancouvtr. (Original ^ The cones o
. Forest insect conditions in British Columbia [microform] : a preliminary survey. Insect pests; Arbres; Forest insects; Insectes nuisibles; Insectes forestiers; Trees. 11 Throughout the Okanagan and Similkameen many bull pines are stag- headed. All such cases examined had been caused by bark-boring caterpillars destroying the inner bark in patches about the trunk and bases of the branches, working downwards from the top. These dead tops were covered with resin, and perfectly Fig. 1—Galls ot the Sitka .'Spruce Gall Aphm, on Sitka Spiucc: Stanley Park, Vancouvtr. (Original ^ The cones of the bull pine and Douglas fir are frequently infested by boring caterpillars, which mine through the scales and axis and later destroy many of the seeds. These ^re in some places sufficiently numcrious to seriously affect reproduction. The larger wood-borers, of the families Ceramhycidx and Bvy^restidcB, are causing much loss to fire-killed oi injured timber, and to felled ?imber and logs which»are left in the limits, out of -vater, during two seasons or more. The Ambrosia-beetles i^Timber-beetles, or Pin-hole Borers), are also respon- sible for considerable loss under like conditions. 57425—3. 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 Swaine, J. M. (James Malcolm), 1878-1955; Canada. Division of Entomology; Dominion Experimental Farms and Stations (Canada). Ottawa : Govt. Print. Bureau
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