Incidence of Bean Common Mosaic Virus in USDA Phaseolus Germ Plasm Collection. R. E. Klein, Postdoctoral Research Associate, Department of Plant Pathology, Washington State University, Pullman 99164-6430. S. D. Wyatt, and W. J. Kaiser. Associate Professor, Department of Plant Pathology, Washington State University, Pullman 99164-6430, and Research Plant Pathologist, USDA-ARS, Western Regional Plant Introduction Station, Washington State University, Pullman 99164-6402. Plant Dis. 72:301-302. Accepted for publication 21 October 1987. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/PD-72-0301.

The USDA Phaseolus germ plasm collection was surveyed to determine the incidence and serogroups of seedborne bean common mosaic virus (BCMV) in accessions of 10 Phaseolus species. BCMV was found in accessions of P. vulgaris, P. acutifolius, P. aborigineus, and P. angustifolius. This is the first report of seedborne BCMV in the latter two species. BCMV was not found in accessions of P. anisotrichus, P. coccineus, P. dumosus, P. lunatus, P. microcarpus, and P. polystachios. All 490 BCMV isolates that were serotyped were serogroup B. BCMV appears to be a serious problem in P. vulgaris accessions; approximately 60% of the 207 tested were contaminated. Of 8,147 P. vulgaris plants tested, 591 (7%) were positive for BCMV.