Forest Research and Outreach

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A New Threat to California's Oak Trees

July 20, 2020
The Mediterranean Oak Borer (Xyleborus monographus) is an ambrosia beetle that was found infesting several valley oak trees in Calistoga, (Napa County) California in 2019. The extent of its distribution within Napa County and neighboring Sonoma and Lake Counties is currently undetermined.
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