Pacific Northwest Research Station

Title: Seasonal variation of degree-day accumulation in relation to phenology of western spruce budworm, Douglas-fir tussock moth, and host trees in northeastern Oregon.

Author: Wickman, Boyd E.

Date: 1988

Source: Res. Note. PNW-RN-482. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 12 p

Station ID: RN-PNW-482

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.

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

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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