Mediterranean Oak Borer

Distribution in California

MOB has been found in 11 counties: Amador, El Dorado, Lake, Marin, Mendocino, Napa, Placer, Sacramento, Sonoma, Sutter, and Yolo Counties. 

Map of North Central California showing the areas which MOB has been detected in traps and/or trees. The largest section is from Napa / Petaluma up to Ukiah. Sacramento has detections that travel both slightly west and northeast of the City. Small minor detections have been noted near Yuba City, Placerville, and Jackson CA.
Map of MOB distribution as of Summer 2026. By Cutris Ewing, CALFIRE.