2025 IN REVIEW: Emerald ash borers spread, Mediterranean oak borers found in northern Oregon

Two bugs not native to Oregon made headlines in the northern part of the state as infestations were detected.

Since first discovered in 2022, more emerald ash borers were detected in the Portland metro area and Yamhill County. Additionally, a new pest entered the ecological landscape: the Mediterranean ash borer.

In September, the Oregon Department of Forestry found new infestations of emerald ash borers in Clackamas, Washington and Yamhill counties. Marion County also remains under quarantine to slow the spread of an early arrival of emerald ash borers…

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