Cold Hardiness of Two Species of Ips Beetles
Abstract: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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