Insects and Spiders - native

California Prionus Beetle (Prionus californicus) on Aug 4, 2026

Description of specimen

Submitter does not have a specimen

Large brown beetle, approximately 2 inches long. Others have suggested may be a California root borer. Made a hissing sound when disturbed.

Commentary

Avatar of commenter Thank you for your report! Yes, this is California root borer (Prionus). They are not considered pests.

Tom Valente
Aug. 5, 2026, 8:06 a.m.

Location

At my home, in the front yard, in tall grass.

Expert Reviewer

Avatar of Reviewer

Tom Valente
Oregon Department of Agriculture

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