Nonoverwintering of Xanthomonas Bean Blight Bacteria in Michigan. A. W. Saettler, Research Plant Pathologist, Agricultural Research Service, U.S. Department of Agriculture, Michigan State University, East Lansing 48824-1312. C. R. Cafati and D. M. Weller, Former Graduate Students, Department of Botany and Plant Pathology, Michigan State University, East Lansing 48824-1312. Plant Dis. 70:285-287. Accepted for publication 3 September 1985. 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, 1986. DOI: 10.1094/PD-70-285.

A series of studies was conducted over 10 yr to determine survival of Xanthomonas campestris pv. phaseoli (X. c. pv. phaseoli) in Michigan. Twenty isolates of X. c. pv. phaseoli and 10 bean genotypes were used to minimize possible isolate and host effects. Pathogenic X. c. pv. phaseoli were never isolated from 191 separate tissue samples that overwintered (October through April) during the periods 1972–1973, 1975–1977, 1977–1979, and 1980–1982. Thus crop debris infected with X. c. pv. phaseoli does not constitute a source of primary inoculum for the bean common blight disease in Michigan.