a1 Forest Entomology and Pathology Laboratory, Calgary, Alberta
Studies were made on the distribution and survival of the mountain pine beetle over the lower stem of lodgepole pine. The relationship between density of attack and subsequent total length of egg galleries was examined as was the relationship between number of exit holes and number of emerging beetles. The influence on brood survival of tree diameter, density of egg galleries, moisture content of the outer sapwood, lethal temperatures, resinosis in the subcortical region, predators, and parasites is described. Survival is compared between broods established during different flights in the same year. The optimum weather conditions for brood survival are discussed.
(Received September 24 1962)
1 Contribution No. 906, Forest Entomology and Pathology Branch, Department of Forestry, Ottawa, Canada. Contains part of a thesis submitted to the Faculty of Graduate Studies at Montana State College in partial fulfilment of the degree of Doctor of Philosophy.