Canadian Forest Service Publications
Comparison of indicator variables for estimating growth reduction associated with Phellinus weirii root rot in Douglas-fir plantations. 1979. Bloomberg, W.J.; Wallis, G.W. Canadian Journal of Forest Research 9(1): 76-81.
Issued by: Pacific Forestry Centre
Catalog ID: 1950
Available from the Journal's Web site. †
† This site may require a fee
Total height, annual height increment, annual diameter at breast height (dbh) increment, ratio of total height to dbh, and ratio of annual height increment to annual dbh increment were assessed as indicator variables for estimating growth reduction associated with Phellinusweirii root rot of Douglas-fir (Pseudotsugamenziesii). Generally, height variables were more sensitive indicators than dbh. Total height by 2-cm-dbh classes, ratio of total height to dbh, and ratio of annual height increment to annual dbh increment were more sensitive and less variable than the other indicators. Ratio of total height to dbh was a more consistent and sensitive indicator of growth reduction than all other variables. Application of this ratio in estimating height growth reduction in three plantations indicated reductions in infected trees of 1 to 8 m over periods of 2 to 24 years, averaging 0.9 to 1.7% annually.