Help Stop the Beetle Killing Southern California’s Oak Trees

The goldspotted oak borer (GSOB), a small but destructive beetle, is killing tens of thousands of oak trees across Southern California by burrowing under their bark and disrupting their ability to transport water and nutrients. This invasive pest poses a serious threat to native oak woodlands, which serve as crucial habitat for wildlife and are vital to the region’s ecological health.

To combat this growing threat, the University of California Cooperative Extension (UCCE) is launching a region-wide “GSOB Blitz” from June 1 to June 15. The initiative will mobilize volunteers across six counties — Los Angeles, Ventura, San Diego, Orange, Riverside, and San Bernardino — to detect and map GSOB infestations. UCCE is partnering with CALFIRE, the U.S. Forest Service, Irvine Ranch Conservancy, and other community organizations to train and lead volunteer groups.

No prior experience is needed to participate. Volunteers will receive training through an online course and a live webinar on May 27, along with field supplies and instructions on the day of their local blitz. By joining this community science effort, volunteers will play a critical role in protecting Southern California’s iconic oaks from further devastation. More information and registration details can be found at ucanr.edu/gsob-blitz.