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Effects of Gypsy Moth on Radial Growth of Deciduous Trees

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We investigated the effect of gypsy moth (Lymantria dispar L.) larval abundance on annual radial growth of preferred, intermediate, and avoided host trees: northern red oak (Quercus rubra L.), sugar maple (Acer saccharum Marsh.), and white ash (Fraxinus americana L.), respectively. Individual trees were surveyed for gypsy moth larvae from 1979 to 1992 in a chronically infested forest on a drought-prone site in southwestern Qu├ębec. Increment cores were collected from 156 oaks, 39 maples, and 39 ash, and annual radial growth indices from 1950 to 1992 were calculated for each species. Growth was corrected for the influence of climate using regression models. For red oak, the average number of gypsy moth larvae per tree explained 73% of the variance in growth not explained by climate. Sugar maple and white ash growth was not correlated with gypsy moth larval numbers. These results are consistent with gypsy moth host preferences and provide evidence that nonepidemic levels of gypsy moth larvae can have a significant negative effect on the radial growth of individual trees. For. Sci. 47(3):338–348.
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Keywords: Acer saccharum; Fraxinus americana; Lymantria dispar; Quercus rubra; dendroecology; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; natural resource management; natural resources

Document Type: Miscellaneous

Affiliations: Department of Biology, McGill University, 1205 Docteur Penfield Ave., Montreal, QC, H3A 1B1, Phone: (514) 398-6456 [email protected]

Publication date: 2001-08-01

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    Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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