How to Manage Pests

Pests in Gardens and Landscapes

Stem gall on forsythia—Phomopsis spp.

Stem gall is caused by a fungus that is most damaging to injured or stressed plants. Stem gall causes galls or swellings to form on twigs or stems of forsythia, often high on the plant. Twigs or stems may die back.


Protect plants from injury. Provide a good growing environment and appropriate cultural care.

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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