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A Selective Medium for and a Definitive Colony Characteristic of Erwinia amylovora. J. E. Crosse, Plant Pathologist, East Malling Research Station, East Malling, Kent, England; R. N. Goodman, Professor, Department of Plant Pathology, University of Missouri, Columbia 65201. Phytopathology 63:1425-1426. DOI: 10.1094/Phyto-63-1425.

A high sucrose medium (40%) permitted selection of Erwinia amylovora from a variety of bacterial species living epiphytically on apple leaf surfaces. The medium had a high plating efficiency; i.e., permitted all E. amylovora cells to develop colonies, albeit slowly. Colonies examined at 15 and 30× magnification under oblique light revealed characteristic craters which permitted positive identification of the pathogen.