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    Author(s): Richard R. Mason; Donald W. Scott; H. Gene. Paul
    Date: 1993
    Source: Res. Pap. PNW-RP-460. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 12 p
    Publication Series: Research Paper (RP)
    Station: Pacific Northwest Research Station
    PDF: View PDF  (740 KB)

    Description

    A predictive technique using a simple linear regression was developed to forecast the midcrown density of small tussock moth larvae from estimates of cocoon density in the previous generation. The regression estimator was derived from field samples of cocoons and larvae taken from a wide range of nonoutbreak tussock moth populations. The accuracy of the predictions was demonstrated on an operational basis in an independent tussock moth outbreak.

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    Citation

    Mason, Richard R.; Scott, Donald W.; Paul, H. Gene. 1993. Forecasting outbreaks of the Douglas-fir tussock moth from lower crown cocoon samples. Res. Pap. PNW-RP-460. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 12 p

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    Keywords

    Predicting insect populations, insect outbreaks, sampling insects, Douglas-fir tussock moth, Orgyia pseudotsugata

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