Cornell is at the forefront of determining how "invisibility cloaks" and walls of protection may give ash trees hope of revival.

oratorium on the planting of ash trees and a state effort to fell the trees from state forests, Columbia County will continue selling ash saplings during its annual tree sale. The program, which ...

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.

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 lush ...