Cold Hardiness of Two Species of Bark Beetles in California Forests
Author: YUILL, J. S.
Source: Journal of Economic Entomology, Volume 34, Number 5, October 1941 , pp. 702-709(8)
Publisher: Entomological Society of America
Abstract:During past years reports of high mortality in bark beetle populations following periods of extreme cold have come from various parts of the country. Such reduction in the numbers of overwintering broods, of course, has a highly important bearing on the planning and directing of control operations. Consequently, when it was found that the abnormally low temperatures during the winter of 1932–33 had adversely affected overwintering broods of the western pine beetle, Dendroctonus brevicomis Lec, from central California to Canada and into Montana, the greater portion of its natural range, Keen and Furniss (1937) made an extensive study in the pine forests of eastern Oregon to determine the conditions under which winter killing of this species takes place. They reported that extensive mortality can be expected to result from the periods of extremely cold winter weather that occur at irregular intervals of approximately 10 years, but that the amount of killing varies considerably with local temperature conditions in different areas, bark thickness and moisture content of the infested trees, and other factors.
Document Type: Research Article
Publication date: October 1, 1941
- Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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