One of North America’s most destructive bugs arrives in Oregon

Emerald ash borer tracks in the bark of an ash tree in Minnesota. (Hennepin County Master Gardeners/Flickr)

A Portland biologist recently found an iridescent bug with the potential to wipe out Oregon’s ash trees, marking the first sighting on the West Coast.

The Oregon Department of Agriculture confirmed Monday that emerald ash borers, an invasive beetle whose larvae kill ash trees by burrowing into their bark, were discovered near a parking lot in Forest Grove…