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Disease Note. 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. |