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Disease Detection and Losses

Effect of Stem Location of Fusiform Rust Symptoms on Volume Yields of Loblolly and Slash Pine Sawtimber. R. S. Webb, Assistant professor and extension forest pathologist, School of Forest Resources and Conservation, University of Florida, Gainesville 32611; H. D. Patterson, biologist, School of Forest Resources and Conservation, University of Florida, Gainesville 32611. Phytopathology 74:980-983. Accepted for publication 23 March 1984. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/Phyto-74-980.

The stem location and extent of cankers or galls caused by Cronartium quercuum f. sp. fusiforme were analyzed for 230 loblolly (Pinus taeda) and 217 slash (P. elliottii var. elliottii) pines of sawtimber-size in the southeastern United States. The average losses of utilizable sawtimber volume, 24- 43% for loblolly pine and 23- 53% for slash pine, were related inversely to the 10- ≥ 18-in. diameter classes. Symptoms occurring within the initial 8 ft of the first sawlog resulted in the greatest proportional volume loss for either host species.