Counties without a confirmed GSOB infestated tree should refer to the general information, resources and contacts throughout this site or those listed below.
Report suspected GSOB symptoms on this online survey form.
UC Cooperative Extension
9335 Hazard Way, Suite 201
San Diego, CA 92124
UC Riverside Center for Invasive Species Research (CISR):
UC ANR Pests and Diseases of Southern California Oaks:
UCCE offices statewide:
County Agricultural Commissioner’s offices statewide: