Goldspotted Oak Borer (GSOB)


Goldspotted Oak Borer (GSOB) has been confirmed to have been recently  found in the Idyllwild area of Riverside County by Cal-Fire. Click here to view the Press Release.

(GSOB) has previously been found to be causing significant mortality in three different Oak tree species in San Diego County. This invasive pest was found in San Diego County several years ago, but only recently has it been linked to the death of three common oak tree species. The pest is spread primarily through the movement of infested firewood. Due to the proximity of Riverside County to San Diego County, we are asking for the public's help in preventing further introduction of this pest into our county.

The links below have been provided to help answer questions about GSOB and the serious threat to the oak trees in our county. Information about GSOB will be updated as necessary so please check back frequently.


Website Links

UC ANR - GSOB Working Group

UC Riverside - Center for Invasive Species

California Forest Pest Council

California Firewood Task Force


Educational Materials

Oak Firewood Advisory Flyer

Vendors and Sellers Oak Firewood Advisory Flyer

US Forest Service GSOB Flyer

UC GSOB Pest Note

UC GSOB Field ID Guide

CalFire GSOB Tree Note

USDA FS Pest Alert 2008


Newspaper Articles

Idyllwild Town Crier - 9/23/2010


Last Update: 9/21/2017