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    Author(s): Boyd E. Wickman
    Date: 1986
    Source: Res. Note. PNW-RN-440. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 8 p
    Publication Series: Research Note (RN)
    Station: Pacific Northwest Research Station
    PDF: View PDF  (329 KB)

    Description

    Radial growth of white fir trees, Abies concolor (Gord. and Glend.) Lindl. ex Hildebr., defoliated almost 30 years ago by Douglas-fir tussock moth, Orgyia pseudotsugata (McDunnough), in the central Sierra Nevada was compared with 22 years of growth prior to the outbreak. There was little difference in growth between the two periods indicating that enhanced growth of defoliated trees after the out-break did not occur as reported for two other California outbreaks. Increment cores also revealed for the first time an even older outbreak, which occurred on the same site in 1906-8.

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    Citation

    Wickman, Boyd E. 1986. Growth of White fir after Douglas-fir tussock moth outbreaks: long-term records in the Sierra Nevada. Res. Note. PNW-RN-440. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 8 p

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    Keywords

    Increment (radial), insect outbreaks, Douglas-fir tussock moth, white fir, California (Sierra Nevada), Sierra Nevada—California

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