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Cold Hardiness of Two Species of Ips Beetles

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Cold hardiness studies of the overwintering adult stage of two, five-spined Ips were made during the winters of 1960-1961 and 1961-1962. Ips confusus, infesting pinyon pine in Arizona and New Mexico, can successfully withstand 5° to 10°F colder temperatures than Ips lecontei, a pest of ponderosa pine in central and southern Arizona. Little, if any, additional cold hardening was exhibited by either beetle between November and March. Both beetles tolerated colder temperatures the second year. Mortality varied with air temperature, length of exposure, bolt diameter, and bark thickness. Natural mortality in the infested forests verified the accuracy of the laboratory experiments.

Document Type: Journal Article

Affiliations: Entomologist, Rocky Mountain Forest and Range Expt. Sta., Forest Service, U. S. Dept. Agric., central headquarters at Fort Collins, Colo., in cooperation with Colorado State University

Publication date: September 1, 1966

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  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.
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