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    Author(s): Nilima Srivastava; Roy C. Beckwith; Robert W. Campbell; Torolf R. Torgersen
    Date: 1981
    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
    PDF: View PDF  (88 KB)

    Description

    Pupal 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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    Citation

    Srivastava, 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

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    Keywords

    Population sampling, insect surveys, sampling methods, insect populations, western spruce budworm, Choristoneura occidentalis

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