Written by University of California Cooperative Extension Forestry
- Author: UCCE Napa County
Published on: 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. It is not believed to have spread to other parts of the state. However, there is considerable potential for the beetle's range to expand as they can be moved in infested wood and the females can fly. Native to Europe,...
Focus Area Tags: Environment
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