How to Manage Pests

Pests in Gardens and Landscapes

Common canker diseases

Other causes of cankers

Chinese elm anthracnose
Chinese elm anthracnose. Identification tip: Irregular, black, tarlike spots form on leaves; leaves drop and twigs die back; affects Chinese elm only.

Botryosphaeria canker
Botryosphaeria canker. Identification tip: Branches turn reddish brown and die back and often exude drops of yellowish pitch; attacks many species, but especially Giant Sequoia

Pine pitch canker
Pine pitch canker.
Identification tip
: Dark, reddish pitch appears on pine limbs or trunk; branches may die; affects pine trees only.

Necteria canker
Nectria canker.
Identification tip: Reddish lesions on young shoots or spurs; concentric ridges develop around the dead tissue; affects hardwood tree species

Cytospora canker
Cytospora canker.
Identification tip
: Sunken, smooth, roughly elliptical, reddish brown cankers appear; affects many broadleaf and needle species

Cypress canker
Cypress canker.
Identification tip
: Resinous lesions form on infected bark; fungus can girdle limbs; affects only cypress trees, especially Cupressocyparis leylandii

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