Oregon expands emerald ash borer quarantine as invasive beetle spreads, threatening ash trees.

The emerald ash borer (EAB), an invasive beetle from eastern Asia, is spreading rapidly in Oregon, with detections in multiple new locations since 2022. Multnomah County has been added to the EAB quarantine zone to prevent human-assisted spread by restricting the movement of firewood and plant materials from ash trees. The Oregon Department of Forestry is urging residents to report suspected EAB sightings and consider replacing vulnerable ash trees to mitigate environmental impacts.