In the woods near Libby grows a quaking aspen five feet across. It is the biggest in the United States and Milarch has cloned it. He also cloned what is believed to be the nation's largest narrow leaf ...

The emerald ash borer has decimated ash trees in New York, which once comprised 7 percent of the biomass of the state’s forests. In a region of Ulster County stretching from Kingston up to Saugerties ...

An invasive, tree-killing pest has made its way to Portland, spelling trouble for the many ash trees that cool residential neighborhoods on hot summer days. On Wednesday, Oregon forestry officials ...

Winter isn’t the ideal season for pruning trees in Upstate New York, but it’s the best time to cut scion or twigs from ash trees in parts of the state where the species has been all but wiped out.

This non-native beetle kills ash trees by feeding on the layer beneath the bark, cutting off water and nutrients. Approximately one-third of the trees in Fort Collins are ash trees, making the city's ...