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Spread and Damage of Western X-disease of Chokecherry in Eastern Nebraska Plantings. Glenn W. Peterson, Plant Pathologist, USDA Forest Service, Rocky Mountain Forest and Range Experiment Station, Forestry Sciences Laboratory, University of Nebraska, Lincoln 68583. Plant Dis. 68:103-104. Accepted for publication 2 August 1983. 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, 1984. DOI: 10.1094/PD-68-103.

The western X-disease pathogen has spread rapidly from artificially inoculated chokecherry to healthy chokecherry in experimental plantings in eastern Nebraska. Symptoms appeared on more than 60% of the chokecherry trees within 3 yr and on more than 80% of the trees within 5 yr after the X-disease pathogen was introduced. Chokecherry mortality caused by this pathogen was more than 50% within 8 yr and more than 80% after 15 yr except in one planting shaded by pines, where the mortality after 15 yr was 60%. After 9 yr, none of the American plum trees planted within rows of infected chokecherry had been killed or damaged by the western X-disease pathogen.