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The Biology of Conophthorus monticolae in Northern Idaho

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Collections of Pinus monticola cones were made at 32 collection sites throughout northern Idaho. Longitudinal sections of the majority of these cones were examined, and recorded, as beetle infested or non-infested and the remaining cones placed in rearing. Life history data were obtained from infested cones collected periodically. Conophthorus monticolae Hopk. was present in all stands sampled. Oviposition occurred from late May to late June, and eggs hatched in 5 to 10 days. Larvae passed through two instars in about four weeks and were most abundant from mid-June to mid-July. Pupation occurred within the cones, and transformation to the mature adult required three weeks. Overwintering took place in aborted cones. Larvae of Dioryctria abietella (D & S) and Eucosma rescissoriana Hein. also were abundant. An average of nine percent (0 to 36 percent) of the cones were infested by C. monticolae, and 26 percent (2 to 53 percent) by the cone moths. Seven parasite species also were recovered.
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Document Type: Journal Article

Affiliations: Professor, College of Agriculture, University of Idaho, Moscow

Publication date: 01 June 1966

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