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.

It’s an extremely invasive species of insect and its favorite meal is Ash trees. “It targets all Ash trees in Texas,” said ...

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.

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 ...

The emerald ash borer, an invasive species from Asia first spotted in the U.S. over 20 years ago, is responsible for the destruction of countless ash trees across the nation.

Nope. This photo shows big leaves from a healthy ash tree at the top and small leaves of an ash tree damaged by emerald ash borers at the bottom. (ISU Extension - Courtesy Photo) ...

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.

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 ...

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 ...

"When you look out of your house at a tree that has been there for 80 years and you come home and it's gone. It gets emotional," said Liudahl, who tries to keep his eye on the big picture.

In 2021, for example, the city planted about 470 trees and removed about 670, including 380 ash trees and 290 other dead or hazardous trees, according to the city’s Green Tier sustainability report.