Effect of Past European Pine Shoot Moth Infestations on Volume Yield of Pole-Sized Red Pine
As the first step in assessing European pine shoot moth (Rhyacionia buoliana) impact on volume yield in red pine (Pinus resinosa), a regression was devised for estimating mean population per tree retrospectively in pole-sized plantations. Predictors were percentage of trees with residual injury signs at a given height and time since injury. Yearly late-larval densities were then estimated for past years in one 0.016-ha plot in 25 additional plantations 16 to 30 years old. The three highest estimated yearly densities per plot averaged 1 to 29. Estimated densities peaked early in plantation development, usually at tree heights less than 2 m; subsquent declines are attributed to winter mortality above snow depth as the trees aged. Observed dbh, total height, and cubic volume/ha on plots did not differ significantly from expected values obtained with a red pine growth and yield model. A negative relation between observed-expected total height ratios and estimated insect density means was almost significant statistically, but relations involving dbh and cubic volume/ha ratios clearly were not. Impact on volume yield for the reconstructed population densities apparently was negligible. Pole-sized trees have sufficient time to overgrow early injury; between years 10 and 18 after injury about 30 percent of residual injury signs disappeared. Long-term impact on volume yield by terminal-feeding insects should not be assumed without appraisal based on impact-density correlations. Forest Sci. 24:543-550.
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Document Type: Journal Article
Affiliations: Forester, U.S. Army Corps of Engineers, St. Paul, Minnesota 55101
Publication date: 1978-12-01
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