The Mediterranean oak borer, an invasive beetle known to transmit a sometimes fatal fungus to Oregon white oak trees, has been found in Marion and Polk counties.
Summer trappings also showed that the pest from Europe, North Africa and western Asia is in Clackamas, Multnomah, Washington and Yamhill counties.
Officials with the Oregon Department of Forestry said the tiny beetle is a concern because it carries a fungus that can infect a tree with a vascular wilt, which can lead to tree death…