Insects and Spiders - invasive

Mediterranean Oak Borer (Xyleborus monographus) on Dec 29, 2023

Submitter does not have a specimen
EDRR Status: Local expert notified

Description of specimen

I believe this is a mob. It fell on me while I was sitting in my garden last August and thought it was strange looking so I took a picture, but just recently listened to the In The Woods podcast about MOB and had a very startling realization that this might have been one.


Hi Cat, many many beetles look like MOB and a microscope rather than a picture is often required for ID. Symptoms of infestation can be seen in these two documents below (and I included other informative links), but the two features that most often stand out are sections of dieback in the crown (not visible this time of year) and pale boring dust along the trunk or around the base. If you see these symptoms we would be happy to visit your tree(s) to determine if MOB is present. At this point we are not advising pre-emptive removal of oaks or avoidance of planting oaks. However if your intentions are to extensively plant oaks be advised that they could be at risk from MOB, ensuring that your oaks are established well and stay healthy will give them the best chance of survival.

Other oak pests:
Press release:
MOB map:

Christine Buhl
Jan. 2, 2024, 1:35 a.m.