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Mortality, Dieback, and Growth of Defoliated Hemlock and White Pine

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In 1981, hemlock and white pine growing in four mixed-wood stands defoliated by gypsy moth were examined for amount of defoliation, crown class, and stem diameter. During May and October 1982-84 the trees were examined for refoliation, mortality, and crown dieback. Hemlock mortality rose quickly to 37% by October 1982 and slowly thereafter to 43% in October 1984. Mortality among dominant hemlock was half that of other crown classes. No dominant or codominant white pine died. Mortality of intermediate white pine leveled at 6% by October 1983; 16% of suppressed trees died by May 1983, and mortality rose slowly to 26% by October 1984. In the spring following defoliation about a third of the surviving hemlock had crown dieback; within two years, three-fourths of these trees died. No hemlock or white pine defoliated less than 60% died. Diameter growth in 1982, the year following defoliation, was about a fourth of that in 1984 for thinned trees and half for unthinned trees. North. J. Appl. For. 5:93-96, June 1988.
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Document Type: Journal Article

Affiliations: Department of Forestry and Horticulture, The Connecticut Agricultural Experiment Station, P. O. Box 1106, New Haven, CT 06504

Publication date: 1988-06-01

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Northern Journal of Applied Forestry covers northeastern, midwestern, and boreal forests in the United States and Canada.
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