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.
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.
patches of sugar and trunk reddening