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    Author(s): R.R. Mason; R.C. Beckwith
    Date: 1990
    Source: Res. Note PNW-RN-497. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 12 p
    Publication Series: Research Note (RN)
    Station: Pacific Northwest Research Station
    PDF: View PDF  (1.33 MB)

    Description

    A sampling method was derived whereby budworm density can be estimated by the frequency of occurrence of larvae over a given threshold number instead of by direct counts on branch samples. The model used for converting frequencies to mean densities is appropriate for nonrandom as well as random distributions and, therefore, is applicable to all population densities of budworm. The method is suggested as a possible alternative to the direct counting of larvae in lower crown sampling.

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    Citation

    Mason, R.R.; Beckwith, R.C. 1990. Sampling western spruce budworm larvae by frequency of occurrence on lower crown branches. Res. Note PNW-RN-497. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 12 p

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    Keywords

    Sampling insects, insect defoliators, western spruce budworm, Choristo-neura occidentalis, frequency sampling

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