Mediterranean oak borer

Mediterranean oak borer (MOB), Xyleborus monographus, is an emerging threat to valley and blue oaks (Quercus lobata, Q. douglasii) in California and Garry oaks, a.k.a. Oregon white oaks, (Q. garryana) in Oregon. At this time, the pest has been confirmed extensively in Napa, Sonoma, Lake, Marin, and Sacramento counties in California and confirmed in southern and eastern Portland-metro areas in Oregon.