Add Yahoo as a preferred source to see more of our stories on Google. The emerald ash borer (Agrilus planipennis) was first identified as an invasive species in the US in 2002. It is now found in over ...

In ash trees, for example, we've begun to detect methylation changes linked to ash dieback pressure, offering clues as to how trees regulate their defenses over time as a disease progresses. Trees are ...

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 ...