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

Looking for relief from the sun? These seven fast-growing shade trees are perfect for creating a cooler, more comfortable backyard in a short time.

Have you noticed discoloration on your maple tree leaves this year? You aren't the only one. Here's what you should know ...

The Emerald Ash Borer, an invasive species of bark beetle that was discovered in Colorado in 2013 and has been expanding through the state, has the potential to damage the Colorado landscape. And ...

Unfortunately, there is a substantial threat to this tree that spans across the eastern United States — beech leaf disease ...

What is the largest organism? Until a few years ago, Oregon’s “humongous fungus” was considered the world’s largest organism.

Some national parks, like Sequoia and Redwood, are known for their ancient trees. But the world's oldest tree was from ...

Aspen trees are vulnerable to infection from a number of sources. Common problems include fungal diseases like Cytospora, leaf spots, and other cankers that can cause trunk rot.

Aspen groves are unique ecosystems that develop and survive off an underground root system that spreads out, sending new "suckers" that become aspen trees. Their roots connect many individual ...

Aspen Canker Greg Blick / Flickr / CC BY-NC-ND 2.0 Quaking aspen (Populus tremuloides Michx.) is one of the most well-known and widespread tree species in the western United States.

The aspen bracket fungus (Phellinus tremulae) is host-specific to aspen trees, causing heart rot in the trunks and producing large distinctive brackets that can persist for years.

A large swath of dead trees along Stewart Creek near the trail to San Luis Peak, one of Colorado's 14ers, in the San Luis Mountains. “So that adds to complexity about what can we do with the ...