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Interaction of Virulent Single-Gall Rust Isolates of Cronartium quercuum f. sp. fusiforme and Resistant Families of Loblolly Pine

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Basidiospores derived from 6 virulent single-gall aeciospore isolates of Cronartium quercuum f. sp. fusiforme produced different frequencies of galls on half-sib progeny of 21 loblolly pine families. One family was immune to infection by 2 of the isolates (0% of seedlings with galls), but only moderately resistant (53% galls) to another isolate. Another family was susceptible to all 6 isolates (70-82% of seedlings with galls). The interactions between individual families and the 6 isolates suggest that there are at least 9 different patterns of relative susceptibility among these 21 pine families to the 6 isolates, based on percentage of seedlings with galls. The patterns suggest that there are a variety of resistance genes among these families providing a broad genetic base for field resistance. Gall length was not always related to relative resistance. Three resistant families, 151-791,152-60, and 11-41, had the shortest average gall lengths of 21, 26, and 27 mm, respectively. However, resistant family 10-5 had the greatest average gall length of 52 mm. For. Sci.: 38(3):641-651.
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Keywords: Gall frequency; Pinus taeda; gall length; symptoms

Document Type: Journal Article

Affiliations: Principal Plant Pathologist, USDA Forest Service, Forestry Sciences Laboratory, Athens, GA 30602

Publication date: 1992-08-01

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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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