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Root Disease Incidence in Eastern White Pine Plantations With and Without Symptoms of Ozone Injury in the Coweeta Basin of North Carolina. T. D. Leininger, Research Plant Pathologist, Pacific Southwest Forest and Range Experiment Station, Forest Service, U. S. Department of Agriculture, Riverside, CA 92507. W. E. Winner, and S. A. Alexander. Associate Professor, Department of General Sciences, Oregon State University, Corvallis 97331; and Associate Professor, Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg 24061. Plant Dis. 74:552-554. Accepted for publication 6 December 1989. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1990. DOI: 10.1094/PD-74-0552.

A survey was conducted in the Coweeta Basin, Macon County, North Carolina, to determine the incidence of root diseases and their relatedness to ozone symptomatology in two eastern white pine (Pinus strobus) plantations. Heterobasidion annosum was isolated from <1% of root segments sampled in a stand without symptoms of ozone-caused foliar injury. No root pathogens were found in a stand with symptoms of ozone-caused foliar injury. No relation was found between injury caused by ozone and the incidence of root diseases in these stands.