Many urban canopies across U.S. cities are dominated by only a handful of tree types, putting them at risk of being wiped out by an insect or disease.

In 2006, Kathleen Knight was walking through a forest in northwest Ohio. She's a researched ecologist with the U.S. Forest Service. All around her were big, beautiful ash trees, tall trunks with ...

Ash trees are a valuable part of our forests, where they provide habitat to all types of creatures. To help protect the tree from extinction, researchers at NC State have enlisted an old enemy of ...

Kris Dullmer of Ash Tree Solutions, right, injects an insecticide into an ash tree named Big Jim in the Catamount Community Forest to combat the emerald ash borer in Williston on Tuesday, June 25.

When Maine-based artist Daniel Minter saw the devastation created by Emerald ash borer to towering trees at Lynden Sculpture Garden, he decided to create around it. Two years later his creation ...

The Emerald Ash Borer is an invasive pest killing ash trees across North America. It’s also threatening the practice of basket-making for many Indigenous tribes who rely on the ash.

Dead ash trees are seen at Buttercup Farm Audubon Sanctuary on June 4. Since 2009, the vast majority of white, black and green ash trees have been wiped out by an invasive pest.

Ash tree's used make up 40% of the trees in Fargo; it's now down to about 20%. "We're making big progress to start mixing it up and prepare for future problems that we don't foresee yet, but we'll ...

This photo shows the side view of an adult emerald ash borer. The invasive beetle is native to Asia and has killed more than 100 million ash trees in the U.S. since its arrival in 2002.

It’s an extremely invasive species of insect and its favorite meal is Ash trees. “It targets all Ash trees in Texas,” said Hector Marines, Regional Urban Forester, Texas A&M Forest Service. “White Ash ...

Ash tree removals are an expensive burden caused by an invasive beetle. A new grant will help Minneapolis homeowners cover the costs, but many feel more must be done for people currently paying ...