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Monoterpene hydrocarbons in foliage vapors from four Douglas-fir clones, two resistant and two susceptible to deer browsing, were compared by gas chromatographic analyses. Foliage was collected during the winter. Many chemical components were separated, but only 10 monoterpenes were identified. Different methods of sample preparation and vapor collection affected total volatiles and peak ratios, but with all methods tested foliage resistant to browsing produced more terpenes than that from susceptible clones. Results may have application in breeding Douglas-fir resistant to browsing. Forest Sci. 21:63-67.
Chemist, Pacific Northwest Forest and Range Experiment Station, USDA Forest Service, Olympia, Wash.
Publication date: March 1, 1975
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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.