Insects and Spiders - native

California Prionus Beetle (Prionus californicus) on Aug 2, 2022

Submitter has sample

Description of specimen

Large beetle. Brown/black. Approximately 2 inches in length. Large serrated antennae.


Thank you for your report! Yes, this is the native California root-borer, Prionus californicus. They are not tree killers. Their grubs live mainly in decomposing stumps.

Tom Valente
Aug. 2, 2022, 4:17 p.m.