. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE GENUS DENDROCTONUS. 81 with a few long hairs, the striae narrow, and the spaces between quite broad and roughened with sparsely placed granules. (See &g. 44.) It attacks injured, felled, and healthy silver or western white pine, western yellow pine, and lodgepole pine, in Montana, western Wyo- ming, Idaho, Oregon, and Washington; it also attacks sugar pine, western yellow pine, and lodgepole pine in the mountains of Washing- ton, Oregon, and California. It excavates very long, nearly straight to slightly,
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE GENUS DENDROCTONUS. 81 with a few long hairs, the striae narrow, and the spaces between quite broad and roughened with sparsely placed granules. (See &g. 44.) It attacks injured, felled, and healthy silver or western white pine, western yellow pine, and lodgepole pine, in Montana, western Wyo- ming, Idaho, Oregon, and Washington; it also attacks sugar pine, western yellow pine, and lodgepole pine in the mountains of Washing- ton, Oregon, and California. It excavates very long, nearly straight to slightly, and sometimes strongly, winding egg galleries through the inner living bark and grooves the surface of the wood (figs. 45, 46). The eggs are placed in approximate groups at short intervals along the sides, and the short and broad to long and slender larval mines are exposed in the inner bark; the larvae transform to pupae and adults in separate cells, exposed Viâ â â >--«*â .. or concealed in the inner bark. This ^K^^-^Sf^fcvl species is sometimes associated with the western pine beetle in the same tree, but usually it works independently and oc- cupies the greater part of the bark on the main trunks. Infested trees are first in- dicated by pitch tubes and later by the fading yellow to reddish foliage. SEASONAL HISTORY. OVERWINTERING STAGES. The winter is passed as larvae, young adults, and parent adults, in the inner bark of trees attacked the preceding sum- mer and fall, the parent adults in the egg galleries or ventilating burrows, and the broods in the larval mines or pupal Fig. 44.âThe mountain pine beetle (Dendrodonus monticolse): Adult. Greatly enlarged. (Author's illus- tration.) ACTIVITY OF OVERWINTERED BROODS. As soon as the weather is favorable in April and May the overwin- tered parent adults extend their incompleted egg galleries or excavate new ones in the remaining living bark on the dying trees and deposit eggs. The overwintered broods of you
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