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 ...

A fast-track method of breeding disease-resistant ash trees has been developed by researchers leading efforts to conserve the species ...

Pests are ravaging keystone species like ash, elm, and beech. But researchers are breeding the survivors into more resilient populations. Port Orford cedar trees in Redwood National Park that were ...

HOLYOKE — A small green beetle burrowing in the city’s ash trees is putting them in danger. Officials are actively combating the emerald ash borer, an invasive species. Sometimes trees can be treated, ...