On Wednesday, the Oregon Department of Forestry announced that the emerald ash borer has now been found in the Hazelwood neighborhood in East Portland and five other new sites in the north Willamette Valley. In addition to Portland, the highly invasive and destructive beetle has now been found near other urban areas in the region, including Beaverton, Banks and Oregon City. The Oregon Department of Agriculture said that the discovery of EAB in Portland has now put all of Multnomah County into the EAB quarantine zone, which also includes Washington, Yamhill, Marion and Clackamas counties.

Native to Asia, EAB was first detected in Oregon in 2022 at an elementary school in Forest Grove. Considered to be the most destructive forest pest in North America, EAB has killed over 100 million ash trees nationwide since its arrival in the U.S. more than 20 years ago.

Joining us to discuss the spread of EAB and how the public can help efforts to contain it are Cody Holthouse, manager of ODA’s Insect Pest Prevention and Management Program and City of Portland Forester Jenn Cairo.

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News Source : https://www.opb.org/article/2025/09/11/think-out-loud-portland-oregon-emerald-ash-borer/