Examples of mortality and reduced annual increments of white fir induced by drought, insects, and disease at different stand densities.

P.H. Cochran

doi:10.2737/PNW-RN-525

Treesearch

Examples of mortality and reduced annual increments of white fir induced by drought, insects, and disease at different stand densities.

Informally Refereed

Authors:

P.H. Cochran

Year:

1998

Type:

Research Note

Station:

Pacific Northwest Research Station

DOI:

https://doi.org/10.2737/PNW-RN-525

Source:

Res. Note PNW-RN-525. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 19 p

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Abstract

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.

Keywords

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

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