Plum Bacterial Canker Pathogen: Pseudomonas syringae

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SYMPTOMS AND SIGNS
Symptoms are most obvious in spring and include limb dieback with rough cankers and amber-colored gum. There may also be leaf spot or blast of flowers and young shoots. The sour sap phase of decline may not show gum and cankers, but the inner bark can be brown, fermented, and sour smelling. Flecks and pockets of bacterial invasion in bark occur outside canker margins. Frequently, infected trees sucker from near ground level; cankers do not extend belowground.

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