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How to Manage Pests

Pests in Gardens and Landscapes

Pest identification and confirmation—Root weevil

The root-feeding larvae of several weevils may damage fruit trees, berries, or other plants when adults migrate into backyard plants from nearby host plants. Common species include the cribrate weevil, Otiorhynchus cribricollis; the black vine weevil, O. sulcatus; the strawberry root weevil, O. ovatus; the rough strawberry root weevil, O. rugosotriatus; the fuller rose beetle, Asynonychus godmani; the obscure root weevil, Sciopithes obscurus; and the woods weevil, Nemocestes incomptus.

Adult beetles feed at night, chewing semicircular holes in the edges of leaves. This damage usually does not harm plants but is the first sign that weevils are present. Look for adults at night with a flashlight; depending on the species, they may be present in spring, summer, or early fall.

Damage to leaf edges
Damage to leaf edges
Fuller rose beetle
Fuller rose beetle
Cribrate weevil
Cribrate weevil

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