On ash trees, the buds, leaves, and sometimes twigs may become infected. In early spring, infection of buds or expanding leaves results in irregular brown blotches and distortion of leaflets.

In heavily affected areas, up to 30% of beech trees are killed within seven years of contracting beech leaf disease.

An invasive beetle that kills ash trees has made it to the Nashville area. As a result, up to 13% of Tennessee's trees could ...

Scientists at RBG Kew and Queen Mary University of London have found evidence that young ash tree populations are evolving ...

Natural selection is acting upon thousands of locations within the ash tree DNA, driving the evolution of resistance as the ...

Pinnately compound leaves are common in North America as exampled by the abundance of walnut, pecan, and ash trees in the United States, all of which have pinnately compound leaves.

Darling-58 sprouts, a transgenic American chestnut created by ESF researchers, grow in a nutrient solution. Darling 54, a ...

The emerald ash borer eats into the bark of ash trees and leaves D-shaped holes. Debbie Miller / U.S. Forest Service. Matt Mills, an emerald ash borer support specialist with the Oregon Department ...

Over the years, it's been spotted in Northern Colorado. Described as a "green menace" the emerald ash borer has killed ...

DNA sequencing shows young trees are more likely to have gene variants that confer partial resistance to a fungus that has ...

Light. Mountain ash grows well in full sun or part shade.Too much shade, however, will limit its flower and fruit production. For best flowering, give it at least 6 hours of sun per day.