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    Author(s): P.H. Cochran
    Date: 1998
    Source: Res. Note PNW-RN-525. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 19 p
    Publication Series: Research Note (RN)
    Station: Pacific Northwest Research Station
    PDF: View PDF  (112 KB)

    Description

    Mortality between 1991 and 1995 destroyed a levels-of-growing-stock study installed in four widely separated blocks in the Deschutes and Fremont National Forests in Oregon. Mortality at one block was attributed to root rot (Armillaria ostoyea (Romagnesi) Herink) and western spruce budworm (Choristoneura occidentalis Freeman). Mortality at the other blocks was due to fir engraver beetles (Scolytus ventralis LeConte). Stand densities under investigation were low.

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    Citation

    Cochran, P.H. 1998. Examples of mortality and reduced annual increments of white fir induced by drought, insects, and disease at different stand densities. Res. Note PNW-RN-525. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 19 p

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    Keywords

    White fir, stand density, mortality, periodic annual increments, fir engraver, Modoc budworm, root rot, western spruce budworm

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