Mediterranean Oak Borer (Xyleborus monographus) on Sep 17, 2024

Submitter does not have a specimen

Description of specimen

A large Oregon white oak appears to have two major limbs, about 40% of the canopy, that died abruptly over the summer (brown leaves where the rest of the canopy is still green). I was not able to see any exit holes or frass but the dieback phenology makes me suspect MOB. iNaturalist observation: https://www.inaturalist.org/observations/237166015

Commentary

Thanks for the report Eric I will take a look an report back.

Christine Buhl
Sept. 19, 2024, 8:54 a.m.