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Abundance and Life Cycles of Lepidoptera Associated with an Outbreak of the Western Spruce Budworm Choristoneura occidentalis (Lepidoptera: Tortricidae) in Southeastern Idaho

George P. Markin
Journal of the Kansas Entomological Society
Vol. 55, No. 2 (Apr., 1982), pp. 365-372
Stable URL: http://www.jstor.org/stable/25084300
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Abundance and Life Cycles of Lepidoptera Associated with an Outbreak of the Western Spruce Budworm Choristoneura occidentalis (Lepidoptera: Tortricidae) in Southeastern Idaho
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Abstract

A study of Lepidoptera species comprising an outbreak of defoliators in Douglas-fir stands in southeastern Idaho was conducted in 1976. The outbreak was caused by larvae of six species; including the western spruce budworm, Choristoneura occidentalis (48%), the spruce coneworm, Dioryctria reniculelloides (18%), an olethreutid, Zeiraphera hesperiana (17%), the filament bearer, Nematocampa filamentaria (8%), the spruce tip moth, Griselda radicana (2%), and the western blackheaded budworm, Acleris gloverana (1%). A number of other unidentified larvae (7%) were also collected. Occurrence of the various life stages of each species during this outbreak was determined. A chemical control program against the western spruce budworm should be planned with consideration of possible effects on this complex, in view of the differences in life cycles.

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