Sean O'Brien, from the UNH Cooperative Extension, takes a look at how beech leaf disease spreads and the signs to help you ...

You can remove poison oak from your yard by hand or with an herbicide. No matter which method you choose, wear protective gear, including long sleeves, gloves, long pants, and boots, to minimize your ...

I noticed a lot of small twigs with leaves on them under my oak tree and became concerned about the oak. It is a large, ...

The next potential threat facing Niagara County’s trees could make the jump from across the border. Trees in Canada’s Niagara ...

All tree leaves have an outer layer called the epidermis, which can also be used in the identification process. This leaf "skin" always has a waxy cover called the cuticle and varies in thickness.

A rare look at the earliest stage of a pin oak tree shows how an acorn develops roots and leaves. Learn how one seedling was identified, transplanted and its role in supporting local wildlife.

The other gall I found, which was on a different tree, was an oak leaf pocket gall. This gall is produced by a one-eight-inch-long fly, or midge, called Macrodiplesis quercusoroca.

It’s that time of year: the days are getting shorter, the air has a biting chill to it, and the leaves are turning a reddish-brown before they drop from the trees.

Pin oak trees often appear to have poor leaf color and suffer from leaf chlorosis or yellowing. Depending on the severity of the problem, trees typically range from bright green to bright yellow.

Finding trees for yards with poor drainage can be challenging. Many species do not like to be waterlogged. Sometimes a native tree is the best option if they naturally evolved in damp areas over time.

Red oaks have leaves with pointed tips and include black oak, northern red oak, and northern pin oak. Trees in the white oak group have rounded leaf edges and include white oak, swamp white oak ...