How to Manage Pests

Pests in Gardens and Landscapes

Bacterial canker — Xanthomonas campestris

Bacterial canker is characterized by irregularly shaped, brown, water-soaked areas that develop in the bark and outer sapwood of spurs, branches, and sometimes the tree trunk. Amber-colored gum or white patches of sugar may exude from the margins of cankers. The diseased tissue is reddish brown, moist, and may be sour smelling.

Solutions

Avoid planting trees on sandy or shallow soils. If trees have been damaged by bacterial canker, remove entire affected branches, being sure to eliminate the entire canker and a few inches below.

White patches of sugar and trunk reddening
White patches of sugar and trunk reddening

Cankers in trunk
Cankers in trunk


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

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