Nonoverwintering of Xanthomonas Bean Blight Bacteria in Michigan

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Abstract
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 doses not constitute a source of primary inoculum for the bean common blight disease in Michigan.

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