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A method for sampling western spruce budworm pupae.Author(s): Nilima Srivastava; Roy C. Beckwith; Robert W. Campbell; Torolf R. Torgersen
Source: Res. Note PNW-RN-372. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station 6 p
Publication Series: Research Note (RN)
Station: Pacific Northwest Research Station
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DescriptionPupal density of western spruce budworm, Choristoneura occidentalis Freeman, can be accurately estimated from 45-cm branch tips. Density on tips was representative of densities on entire branches. Mean pupal densities on branch tips are statistically different from lower, mid, and upper crowns (p = .07). Therefore, multi-crown sampling is required to precisely estimate the mean of populations similar to those used in this study.
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CitationSrivastava, Nilima; Beckwith, Roy C.; Campbell, Robert W.; Torgersen, Torolf R. 1981. A method for sampling western spruce budworm pupae. Res. Note PNW-RN-372. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station 6 p
KeywordsPopulation sampling, insect surveys, sampling methods, insect populations, western spruce budworm, Choristoneura occidentalis
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