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    Author(s): R.R. Mason; D.W. Scott; M.D. Loewen; H.G. Paul
    Date: 1998
    Source: Gen. Tech. Rep. PNW-GTR-402. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 14 p
    Publication Series: General Technical Report (GTR)
    Station: Pacific Northwest Research Station
    PDF: View PDF  (233 KB)

    Description

    Characteristics of an outbreak of the Douglas-fir tussock moth (Orgyia pseudotsugata (McDunnough)) in 1991-95 on the Burns Ranger District of the Malheur National Forest (eastern Oregon) are given and compared with an earlier infestation in the same area in 1963-65. Results of monitoring with pheromone traps, evaluating populations by sampling larvae, and predicting trends and defoliation are reported in detail for the latest outbreak. Temporal patterns of each outbreak also are described and compared with the classic behavior of other tussock moth outbreaks. Findings of this analysis, and the recurrent behavior of tussock moth outbreaks in general, reinforce the importance of maintaining a system for detection, evaluation, and prediction in managing Douglas-fir tussock moth populations in the future.

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    Citation

    Mason, R.R.; Scott, D.W.; Loewen, M.D.; Paul, H.G. 1998. Recurrent outbreak of the Douglas-fir tussock moth in the Malheur National Forest: a case history. Gen. Tech. Rep. PNW-GTR-402. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 14 p

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    Keywords

    Douglas-fir tussock moth, Orgyia pseudotsugata, insect outbreaks, sampling insects, pheromone traps, population monitoring

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