Tree experts say green ash trees that are losing leaves in Le Mars and other parts of northwest Iowa have a common fungal disease, not an insect problem, and the trees aren't dying. Last week, state ...

Have you ever wondered why the leaves change color during fall? Well there's a scientific word for this process called, photoperiodism. It's the organism's response to seasonal changes in day length.

ASH: Green ash leaves turn yellow, but white ash has a purplish cast. The leaves fall after those of walnut trees, but earlier than those of oaks and maples. BUR OAK: Buff to yellow colors predominate ...

MANHATTAN, Kan. (KSNW) — A pest that last made a major appearance in Kansas nearly a decade ago is back — and it’s feasting on ash trees across the state. Kansas State University entomologist Raymond ...