Cross-section of a coast live oak trunk showing areas where goldspotted oak borer, Agrilus auroguttatus, feeds.

A cross-section of a coast live oak trunk. Goldspotted oak borer, Agrilus auroguttatus, larvae feed primarily at the interface of the xylem and phloem. Pupae can be found in the outer bark and at the interface of the outer bark and the phloem. Credit: Tom W. Coleman
Credit: Tom W. Coleman