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Clear Lake researchers map Mediterranean oak borer threat and launch county monitoring plan
Summary
Clear Lake Environmental Research Center presented an action plan for monitoring and managing Mediterranean oak borer in Lake County, urging residents and tree professionals to report suspected infestations and avoid moving fresh firewood or unprocessed branches.
Clear Lake Environmental Research Center biologists outlined an early‑detection and response plan Tuesday after presenting evidence that Mediterranean oak borer (Xylosandrus moristatus / commonly called MOB in the presentation) has expanded countywide and is now a priority for local landowners and agencies.
“Black trellis systems in the shallow layers of the tree, tiny circular holes in the bark, pale boring dust around the holes and patchy dieback starting from the tips of the branch” are the principal symptoms to watch for, Julia Klicker, biologist at CLERC, told the Board of Supervisors.
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