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Protection of Apple and Pear Fruit Tissue Against Fireblight with Nonpathogenic Bacteria. J. A. Wrather, Graduate Research Assistant, Department of Biochemistry and Botany and Plant Pathology, Purdue University, West Lafayette, Indiana 47907; J. Kuc(2), and E. B. Williams(3). (2)(3)Professors, respectively, Departments of Biochemistry and Botany and Plant Pathology, Purdue University, West Lafayette, Indiana 47907. Phytopathology 63:1075-1076. DOI: 10.1094/Phyto-63-1075.

Pear and apple fruit were protected against fireblight by avirulent Erwinia amylovora, Pseudomonas tabaci and a yellow bacterium isolated from a fireblight canker. Avirulent E. amylovora did not protect the fruit against a 0-hr challenge, but did protect the fruit against a 24-hr challenge. Pseudomonas tabaci and the yellow bacterium protected apple fruit against a 0-hr and 24-hr challenge and protected pear fruit against a 24-hr challenge.