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Reduction of Infection by Pseudomonas syringae pv. tomato Using a Nonpathogenic, Copper-Resistant Strain Combined with a Copper Bactericide. Donald A. Cooksey, Assistant professor, Department of Plant Pathology, University of California, Riverside 92521; Phytopathology 78:601-603. Accepted for publication 24 November 1987. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/Phyto-78-601.

A nonpathogenic Tn5 mutant of Pseudomonas syringae pv. tomato retained its ability to survive epiphytically on tomato leaves, and coinoculations of the mutant with a pathogenic strain significantly reduced the incidence of bacterial speck in greenhouse tests. When a derivative of the nonpathogen with resistance to high levels of copper was coinoculated with a copper-sensitive pathogenic strain to plants treated with a copper bactericide, significantly greater control was achieved than with either the nonpathogen or the copper treatment alone.