File:The deterioration of beetle-killed Douglas-fir in western Oregon and Washington (1967) (20573700695).jpg

Title: The deterioration of beetle-killed Douglas-fir in western Oregon and Washington
Identifier: CAT92272789 (find matches)
Year: 1967 (1960s)
Authors: Wright, Kenneth H; Harvey, G. M. (George Mather), 1922-
Subjects: Douglas fir Diseases and pests Oregon; Douglas fir beetle Oregon; [https://www.flickr.com/search/?tags=booksubjectDouglas_fir_Diseases_and_pests_Washington_State_Douglas_fir_beetle_Washington_State_ Douglas fir Diseases and pests Washington (State)
Douglas fir beetle Washington (State)]
Publisher: Portland, Or. : Pacific Northwest Forest and Range Experiment Station, Forest Service, U. S. Dept. of Agriculture
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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Text Appearing Before Image:
Clackamas River drainage in the northern Ore-
gon Cascade Range were nearly as old (240+
years) and large (26.5 inches d.b.h.) but had
only about 15 percent of the original cubic
volume 11 years after death. Although statisti-
cal proof is lacking, the authors feel that, for
a given latitude, deterioration is more rapid
in the Cascades than in the Coast Ranges. It
seems reasonable that deterioration is more
rapid during drier summer conditions in the
Cascades. The cool, damp conditions in the
Coast Ranges, particularly on the western
slopes, appear to reduce the rate of decay
as compared with interior areas.

The effect of tree age on rate of deteriora-
tion is suggested by comparison of deteriora-
tion in 140-year-old beetle-killed trees at Ma-
pleton and 250- to 350-year-old trees at Marys
Peak (table 2). After 9 years, 36 percent of the
original cubic volume was decayed at Marys
Peak, whereas, for the same period, the young-
er (and smaller) trees at Mapleton were
66 percent decayed. The two areas are near the
Text Appearing After Image:
Figure 7.
Typical crown
condition
of some beetle-killed
Douglas-firs after
varying lengths of
time since death.

2 YEARS DEAD 3 YEARS DEAD 5 YEARS DEAD
6 YEARS DEAD 7 YEARS DEAD 9 YEARS DEAD 10 YEARS DEAD

10

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