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Callus cultures were established from cherry (Prunus avium) cvs. Napoleon and Colt, respectively susceptible and resistant to race‐1 strains of Pseudomonas syringae pv. morsprunorum, by growth on Schenk–Hildebrandt medium. On Napoleon callus, necrosis began earlier and proceeded more rapidly when inoculated with the virulent race‐1 cherry isolate strain C28, than with mutants of diminished virulence...
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