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    Author(s): Boyd E. Wickman
    Date: 1988
    Source: Res. Note. PNW-RN-482. 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  (990 KB)

    Description

    The annual variation of degree-days and early summer phenology of Douglas-fir tussock moth, western spruce budworm, and their host trees was monitored over five to six seasons at two locations in the Blue Mountains. Accumulated degree-days and the phenology of bud burst and larval development were consistent and comparable at the two sites. Either degree-days or shoot elongation can be used to time simultaneous larval sampling of these two insects.

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    Citation

    Wickman, Boyd E. 1988. Seasonal variation of degree-day accumulation in relation to phenology of western spruce budworm, Douglas-fir tussock moth, and host trees in northeastern Oregon. Res. Note. PNW-RN-482. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 12 p

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    Keywords

    Phenology, grand fir, Douglas-fir tussock moth, western spruce budworm

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