How to Manage Pests

Pests in Gardens and Landscapes

Orange rust—Gymnoconia nitens and Arthuriomyces peckianus

Plants infected with the orange rust fungus have orange, blisterlike pustules covering the undersides of leaves in the spring. Diseased shoots may recover by midsummer, but developing canes are smaller than normal and bear no fruit the following year. Red raspberries are not affected.

Solutions

The fungus that causes orange rust is systemic and remains in the host plant. Remove and destroy infected plants, including the roots. Fungicides are of little value.

Orange rust pustules on blackberry leaves
Orange rust pustules on blackberry leaves


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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