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    Author(s): B.E. Wickman; D.L. Henshaw; S.K. Gollob
    Date: 1980
    Source: Res. Pap. PNW-RP-269. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 23 p
    Publication Series: Research Paper (RP)
    Station: Pacific Northwest Research Station
    PDF: View PDF  (1.59 MB)

    Description

    Radial growth reduction related to amount of tree defoliation was studied following a severe tussock moth outbreak. Growth sharply declined the year after defoliation began, and amount of decline was proportional to percent defoliation. Growth recovery began the year after defoliation ceased and radial increment had returned to pre-outbreak levels 5 years after defoliation.

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    Citation

    Wickman, B.E.; Henshaw, D.L.; Gollob, S.K. 1980. Radial growth in grand fir and Douglas-fir related to defoliation by the Douglas-fir tussock moth in the Blue Mountains outbreak. Res. Pap. PNW-RP-269. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 23 p

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    Keywords

    Increment (radial), defoliation damage, insect damage (-forest, Douglas-fir tussock moth, Orgyia pseudotsugata, grand fir, Abies grandis, Douglas-fir, Pseudotsuga menziesii, Oregon (Blue Mountains), Washington (Blue Mountains)

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