Cytospora canker—Cytospora spp.
Cankers are irregularly shaped, brown, sunken areas that develop in the bark, twigs, branches, and the
tree trunk. Amber-colored sticky gum may exude from the margins of cankers. Orange threadlike structures
may also exude from cankers. Leaves may shrivel and die; branches may also die.
If trees have been infected, remove entire affected branches in the summer, being sure to eliminate the
entire canker and a few inches below. Avoid planting on shallow soils. Where feasible, delay pruning until
late winter; prune in dry weather. Avoid overhead sprinklers and excess fertilization. Maintain good tree
vigor and avoid problems such as bacterial
canker or sunburn as these disorders may make trees more susceptible
to cytospora canker. Whitewashing
trees may help to seal wounds as well as protect against sunburn.
sunken canker on prune branch
structures exuding from cankers