Bacterial Canker of Sweet Cherry Pseudomonas syringae pv. syringae and P. s. pv. morsprunorum

Introduction: Two related bacteria, Pseudomonas syringae pv. syringae van Hall and P. s. pv. morsprunorum (Wormald) Young et al., can cause bacterial canker. Both pathogens affect sweet cherry, sour cherry, plums and prunes in Michigan and the neighboring province of Ontario, Canada. Disease outbreaks are sporadic and more frequent on sweet cherry than on sour cherry. P. s. syringae is found on peach in the southeastern United States.

Text prepared by A. L. Jones and T. B. Sutton