How to Manage Pests

Pests in Gardens and Landscapes

Pest identification and confirmation—Dothiorella canker

Dothiorella cankers closely resemble Phytophthora canker. Dothiorella cankers usually occur higher above the ground, beginning around the first main branch crotch or higher. Dothiorella can infect much smaller limbs, such as twigs and small branches, as well as the upper trunk and large limbs. When cut into with a knife, Dothiorella cankers sometimes extend deep into the wood, while Phytophthora canker discolors only a shallow layer of outer wood.

Canker under bark
Dothiorella canker under the bark of the trunk

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