How to Manage Pests

Pests in Gardens and Landscapes

Bean weevils

Common weevils found in beans are the cowpea weevil, Callosobruchus maculatus; broad bean weevil, Bruchus rufimanus; and the bean weevil, Acanthoscelides obtectus. Adult weevils found in beans are relatively small beetles, 0.13 - 0.2 inch in length, somewhat teardrop or triangular in shape, and dull-colored with white, reddish, or black markings.

Life cycle

Damage

Damage may occur in the garden or in storage. Weevil larvae feed within the bean pod and consume nearly the entire bean contents.

Solutions

Be sure seeds are free of weevils before planting. Remove and destroy bean plants immediately after harvest. Treatment with insecticides is not recommended.

Adult cowpea weevil
Adult cowpea weevil


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