The discovery puts all of Multnomah County into a quarantine zone. It’s the fifth county to be quarantined in Oregon.

With their wide-spreading, leafy branches, ash trees are quite popular in the U.S., but they're being seriously threatened by ...

Just outside Cottage Grove at the U.S. Department of Agriculture’s Dorena Research Center, scientists are playing a numbers ...

BRAINERD — Guidelines are now in place to deal with the injection and removal of ash trees infested with emerald ash borer in Brainerd. City Council members approved the final reading of a tree ...

The emerald ash borer, a small green beetle native to Asia, has been damaging ash trees in the Kansas City area for over a decade. Dr. James E. Zablotny, USDA U.S. Department of Agriculture A tiny ...

The City of Vancouver is injecting ash trees with a pesticide as it looks to deal with the invasive emerald ash borer beetle, a species responsible for millions of ash tree deaths across the continent ...

Portland’s tree canopy will not look the same over the next decade. For many residents, the first signs of the emerald ash borer’s invasion will appear along the city's streets.

An invasive, tree-killing pest has made its way to Portland, spelling trouble for the many native ash trees that cool ...

April is the time to be checking ash trees for signs of the emerald ash borer, the tiny metallic green beetle blamed for the deaths of millions of ash trees in the United States, an expert said. Jon ...

Local foresters are preparing for the inevitable: the arrival of a culprit that, despite its puny size, has ravaged millions nationwide. Cue the emerald ash borer. The beetle, a pest that is smaller ...

How do you find an insect the size of your fingertip in a densely-packed forest? For Jian Duan, the answer is simple: follow the dead ash trees. On a rainy day in eastern Connecticut, Duan, a federal ...

Ash trees are dying by the thousands in south-central Minnesota. Chainsaws are roaring as government workers struggle to keep up. And tree experts warn that 2025 will be much worse. St. Clair was the ...