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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.

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: August 1, 1992

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