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Tobacco Streak and Raspberry Bushy Dwarf Viruses in California Boysen Fields. R. H. Converse, USDA-ARS, Department of Botany and Plant Pathology, Oregon State University, Corvallis 97331. . Plant Dis. 72:175. Accepted for publication 12 October 1987. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/PD-72-0175E.

Individual Boysen (boysenberry, Rubus ursinus Cham. & Schlect.) plants, asymptomatic for virus infection, from 17 commercial fields in the San Joaquin Valley, California, were routinely sample-indexed for raspberry bushy dwarf (RBDV) and tobacco streak (TSV) viruses by enzyme-linked immunosorbent assay (1). RBDV was detected in 7 (41%) and TSV in 14 (82%) of the 17 samples. RBDV was found in five of eight fields near Fresno and in two of nine fields near Modesto. TSV was found in five of the eight Fresno fields and in all of the nine Modesto fields. This is the first report of RBDV in commercial Boysen fields in California. A chi-square test for independence (X2 = 1.352, 1 df, while X2 at P0;.05 = 3.841) showed that the two viruses in sampled Boysen plants occurred independently of each other. Although economic damage to Boysen has not yet been documented for either virus, both are known to spread and cause damage in certain other Rubus cultivars. In view of the widespread occurrence of both viruses in the area studied, consideration should be given in that area to the use of commercially available certified planting stocks, such as Boysen-72-M, that are reported (2) to be free from recognized viruses.

References: (1) R. H. Converse. Plant Dis. Rep. 63:848, 1979. (2) R. H. Converse. Fruit Var. 1. 35:141, 1981.