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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
Published by: Kansas (Central States) Entomological Society
Stable URL: http://www.jstor.org/stable/25084300
Page Count: 8
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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.
Journal of the Kansas Entomological Society © 1982 Kansas (Central States) Entomological Society