Mediterranean oak borer (Xyleborus monographus) is an exotic ambrosia beetle that was first detected in the U.S. in California in 2017. In Oregon, a single individual was found in sentinel traps in 2018 and since then it has been found either in traps or in oaks in six counties in northwestern Oregon. The primary host for Mediterranean oak borer (MOB) in Oregon is Oregon white oak (Quercus garryana) which is a vital component of oak savannas and one of our most drought-tolerant native species. Since the first detection a number of Oregon white oak infested by MOB have died from a wilting disease caused by the fungal associates of MOB. Oregon and California are working to learn more about how this insect has been introduced, where it is present, its biology, and how to manage it. Here we provide updates on what we have learned to date.
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