What's That Bug? does not endorse extermination

Subject: Large black beetle
Location: Southern California- beach area
June 2, 2016 1:59 pm
Hi- could you identify this bug for me? It was found in Southern California climbing through some wood chips at the local school. It didn’t move very fast but was really large! The second photo is when he flipped upside down. Thanks for your help!
Signature: Lacy

California Root Borer

California Root Borer

Dear Lacy,
This is a female California Root Borer, Prionus californicus, and you can compare your individual to this image of a pair of California Root Borers on BugGuide as well as this image of the ventral surface of another individual pictured on BugGuide.  According to BugGuide:  “Larva feed primarily on living deciduous trees (oaks, madrone, cottonwood) and are also recorded from roots of vines, grasses, and decomposing hardwoods and conifers. Will also attack fruit trees growing on light, well-drained soils (e.g. apple, cherry, peach).”

California Root Borer

California Root Borer

What's That Bug? does not endorse extermination
Location: southern California

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