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Ecology and Epidemiology

A New Race of Pseudomonas glycinea. M. D. Thomas, Department of Plant Pathology, University of California, Riverside California 92521; J. V. Leary, Department of Plant Pathology, University of California, Riverside California 92521. Phytopathology 70:310-312. Accepted for publication 8 October 1979. Copyright 1980 The American Phytopathological Society. DOI: 10.1094/Phyto-70-310.

The pathogenic response of seven soybean cultivars to a previously undescribed race of Pseudomonas glycinea is reported. For the purpose of this study, we defined the pathogenic response in terms of resistance and susceptibility. Similarities to selected characteristics of the seven previously described races, specifically pigment production and xylose utilization, were studied. The value of relying on nutritional tests for bacterial species differentiation is considered, since mutants of the new race were isolated which mimic some of the other races. A convention for the use of biochemical tests is proposed.