How to Manage Pests

Pests in Gardens and Landscapes

Bean rust—Uromyces phaseoli

Plants infected with rust have dry reddish, yellowish, or orange spore masses or pustules primarily on the lower surface of leaves. Bean pods may also show symptoms.


Space plants to allow for adequate air circulation. Avoid overhead sprinklers, as rust spores are spread by wind and splashing water. Dispose of infected leaves and shoots as soon as they appear. Fungicides, such as sulfur, applied in the spring can reduce some rust diseases. Some varieties may show resistance.

Rust on bean leaf
Rust on bean leaf

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