California’s Most Wanted: Goldspotted Oak Borer 

March 26, 2026 – CAL FIRE officials issue an alert on the Goldspotted Oak Borer.

This tiny pest is responsible for killing more than 200,000 oak trees across California—and it’s still spreading.

The Goldspotted Oak Borer (GSOB) attacks black oaks, coast live oaks, and canyon live oaks, cutting off the tree’s ability to move nutrients and water. Once infested, trees often die within a few years.

Be on the lookout for:

• Thinning or dying oak canopies
• D-shaped exit holes in bark
• Bark staining or dark sap patches

GSOB spreads long distances by moving infested oak firewood. Moving non-heat-treated wood or infested wood can introduce the pest into new areas.

What you can do:

• Buy or gather firewood where you plan to burn it
• Don’t move firewood out of infested areas
• Report suspected infestations to local and state officials

Protecting California’s oaks helps reduce wildfire risk, supports wildlife habitat, and preserves our landscapes.

Learn more and report suspected infestations at: www.gsob.org (website link not working try this link)

Source: CAL FIRE