Tomato Ringspot Virus Associated with Apple Union Necrosis and Decline in Western United States. C. L. Parish, Research Plant Pathologist, Science and Education Administration, Agricultural Research, U.S. Department of Agriculture, Fruit Research Laboratory, in cooperation with Washington State University, Tree Fruit Research Center, Wenatchee, 98801. R. H. Converse, Research Plant Pathologist, Fruit Research Laboratory, in cooperation with Washington State University, Tree Fruit Research Center, Wenatchee, 98801; and Department of Botany and Plant Pathology, Oregon State University, Corvallis 97331. Plant Dis. 65:261-263. . 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, 1981. DOI: 10.1094/PD-65-261.

Union necrosis and decline were observed in Delicious apples on Malling-Merton 106 and 111 rootstocks in five commercial orchards in central Washington. Virus cultures, which were isolated from Malling-Merton 106 rootstock suckers by sap transmission to tobacco and cucumber, contained tomato ringspot virus, shown by agar gel serology and enzyme-linked immunosorbent assay.