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Title: Weather, logging, and tree growth associated with fir engraver attack scars in white fir
Author: Ferrell, George T.
Source: Res. Paper PSW-RP-92. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station; 11 p
Station ID: RP-PSW-092
Description: The boles of 32 recently killed, and 41 living, white fir were examined for embedded fir engraver (Scolytus ventralis) attack scars. Of 287 scars found in annual rings for the years 1934-69, only 2 to 3 percent represented reproductively successful attacks. Trends in scar abundance were directly correlated with trends in white fir killed by S. ventralis on 15 plots from 1939 to 1954. Influence of weather, host tree growth, and logging on yearly abundance of scars was examined by multivariate regression analysis. Years with increased scar abundance were preceded by at least 1 year of subnormal precipitation and coincided with subnormal tree growth. High peaks occurred when these conditions were contemporaneous with logging in the stand.
Key Words: Scolytus ventralis; Abies spp.; mortality; drought effects; logging effects; growth vigor; timber management; Shasta County, California
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Ferrell, George T. 1973. Weather, logging, and tree growth associated with fir engraver attack scars in white fir Res. Paper PSW-RP-92. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station; 11 p.
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