How to Manage Pests

Pests in Gardens and Landscapes

Stem cankers and dieback—Botryosphaeria dothidea, Cryptosporella umbrina, and others

The fungi that cause stem cankers and dieback infect through wounds and may be spread or promoted by water and rain. Brown cankers, sometimes with gray centers, develop. Small, black, spore-producing structures appear on dead tissue.

Solutions

Provide proper cultural care to keep plants vigorous. Prune off diseased or dead tissue, make cuts at an angle in healthy tissue and just above a node. Avoid otherwise wounding tissue. Avoid overhead water.

Botryosphaeria canker
Botryosphaeria canker

Oozing of canker and drying of foliage
Oozing of canker and drying of foliage


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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