Invasive Emerald Ash Borer Beetle Detected on Both Sides of Cascades

By: David McGimpsey, TVW

Outlets: TVW

Published: November 2, 2026

Words: 99

Last Updated: 6 days ago

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The destructive emerald ash borer beetle has spread to both sides of the Cascade Mountains, following recent detections in Vancouver and Walla Walla.

The invasive insect from East Asia faces no natural predators in the U.S. and has already killed hundreds of millions of trees nationwide. Because the beetle attacks high in the tree canopy, infestations are difficult to detect early, and state agricultural officials warn that eradication has never been successfully achieved.

Residents are …

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