Effect of Gypsy Moth Defoliation on Certain Forest Trees
To determine economic injury by the gypsy moth to forest trees in the New England States, records of defoliation, death of trees and loss of diameter increment were collected from trees in a wide series of plots from 1912 to 1921. Data from the oaks and white pine--species suffering greatest economic injury--show that an increase in average defoliation was associated in general with an increase in mortality. Growth and defoliation data of four species of oaks and white pine show a direct correlation between percentage of defoliation and decline in radial increment. Diameter growth of black, white and scarlet oaks was found to fluctuate inversely with percent of defoliation the same year defoliation occurred. In young white pines defoliated only once there was direct correlation between percent of defoliation and percent of trees dying during the following nine-year period.
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Document Type: Journal Article
Affiliations: Bureau of Entomology and Plant Quarantine
Publication date: 1941-12-01
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