An aggressive hatch of Douglas-fir tussock moth caterpillars is threatening trees, both in national forests and in Santa Fe.

This Ponderosa pine in Custer State Park is listed as the tallest pine in the Black Hills and the tallest tree in South Dakota. It has been listed at 146 feet tall, although loss of branches might ...

As the state's forests become weakened and stressed, they become more susceptible to insects and disease — even some that, at one time, posed little threat.

Thousands of ponderosa pine seedlings are planted in the area of the 2017 Lolo Peak fire. The seedlings, combined with additional phases of western larch on upper elevations, will improve habitat ...

Scroll down for a transcription of this episode. Trees aren’t just competing for sunlight and soil—they’re also looking out for one another. Scientist Suzanne Simard reveals the unexpected ways trees ...

A new state report out this week finds conifer tree deaths – including iconic species like the Ponderosa and Pinyon pine – doubled in New Mexico’s forests last year. The New Mexico Forest Health ...

Discover the major common tree diseases in the United States. Armillaria attacks both hardwoods and softwoods and causes either yellowing leaves or browning needles. Wood that is decaying from ...

Acker asked Colorado Wonders. More than 24 million acres, a third of the state, are forested with trees like spruce fir, ponderosa and lodgepole pine. Three-quarters of those forests are publicly ...

Trees, like people, are more vulnerable to disease and health problems when they are stressed. For most forests, stress is usually from drought and wildfire. A weakened tree attracts beetles. While ...

Don Kaczmarek, a forest geneticist for the Oregon Department of Forestry, joins us to talk about his work breeding trees, and producing seeds for the state’s forests and seed banks.

To determine this, Thomas's team is studying more than 5,000 trees, measuring up to 30 different traits or phenotypes, so they can figure out which tree families are more resilient in Alberta's ...