. Forest insect conditions in British Columbia [microform] : a preliminary survey. Insect pests; Arbres; Forest insects; Insectes nuisibles; Insectes forestiers; Trees. 31 Buth eRg-(unnels and larval mines are unually Jiatinctly engraved on the wood surface. They hibemote beneath the bark as young adults, larvs, and parent ndults. The chief emergonce of the over-wintoreil adults, and attack upon fresh bark, takes place during May, June and early July. Fresh tunnels were started this season until the end of July, and probably later. By the end of July the tunnels which were started earliest con
. Forest insect conditions in British Columbia [microform] : a preliminary survey. Insect pests; Arbres; Forest insects; Insectes nuisibles; Insectes forestiers; Trees. 31 Buth eRg-(unnels and larval mines are unually Jiatinctly engraved on the wood surface. They hibemote beneath the bark as young adults, larvs, and parent ndults. The chief emergonce of the over-wintoreil adults, and attack upon fresh bark, takes place during May, June and early July. Fresh tunnels were started this season until the end of July, and probably later. By the end of July the tunnels which were started earliest containwl larvte of various siies, pupte and young adults. By the end of the season the tunnels which were started in May and early June had the young mostly transformed to adults; in the tunnels started last many of the young over-win*eretain small larvw during winter. There is thus one brood each season, Mh\y a partial second Fi«. 15—Thci DoukIos Fir Bark-bcetlc. Larval-mines and pupal , cells on the i iner surface of Douglas fir bark. (Oritjinal). The abundant reddish boring-dust ejected from the entrance tunnels, and lodged in the bark fissures, distinguishes he infested trunks. During the late fall and spring the foliage of infested trees lades from green to yellow and finally to reddish before summer. When only a portion of the tree is attacked during the first summer the remaining portion may be infested the following season. In such cases the foliage may be in part quite red before the broods have emerged; though, as a rule, by the time the foliage becomes red and dry, few living beetles will be left in the 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
Size: 1351px × 1849px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpubl, booksubjectinsectpests
