Find out about common North American trees with pinnate leaves. Learn how to identify hickory, ash, walnut, black locust, and pecan using this guide.

The damage is invisible at first, but it doesn’t take long for the leaves to wither, the trunks to weaken, the once-vibrant ...

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.

Naturally occurring compounds in ash leaves could be linked to susceptibility of individual trees to the fungal disease ash dieback (ADB). But selecting trees with lower levels of these compounds ...

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

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.

Naturally occurring compounds in ash leaves could be linked to susceptibility of individual trees to the fungal disease ash dieback (ADB). But selecting trees with lower levels of these compounds ...

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.

Fall has come early for many homeowners with ash trees on their properties. First, the leaves sprouted orange dots. Now, many have shed most if not all of their leaves.

A reader wonders what might be causing the leaves on their ash tree to develop dark spots and edges and fall off. Contributed / Special to The Forum. By Don Kinzler. June 18, 2022 at 7:00 AM.

Sycamore and ash tree leaves are dropping early this year in Pittsburgh due to a leaf disease, anthracnose, according to Rob Kruljac, assistant district manager of North Pittsburgh Davey Tree Service.