Cherry Bacterial Canker Pathogen: Pseudomonas syringae

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In this Guideline:

Symptoms
Comments on the disease
Management
Publication
Glossary
SYMPTOMS AND SIGNS
Symptoms are most obvious in spring, and include limb die back with rough cankers and amber-colored gum. There may also be leaf spot and blast of young flowers and shoots. The sour sap phase of bacterial canker may not show gum and cankers, but the inner bark is brown, fermented, and sour smelling. Flecks and pockets of bacterial invasion in bark occur outside canker margins. Frequently, trees sucker from near ground level; cankers do not extend below ground.

Statewide IPM Program, Agriculture and Natural Resources, University of California
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