Young aspens often don't survive because of factors such as grazing elk, according to a study by Northern Arizona University researchers.

Angel Watkins and co-workers in Colorado blame many culprits in the decline of the Aspen. JT Thomas It's a relentlessly sunny day in the Rocky Mountains, and here at 9,000 feet, on the Grand Mesa ...

In their lab, the researchers fed some polyphemus caterpillars leaves from the spongy-moth-infested plot and other polyphemus caterpillars leaves from a stand of aspen trees untouched by spongy ...

Populus tremuloides, the quaking aspen of the North American continent, stands as one of the most easily recognized, most beautiful and most admired of all tree species. In order to help ...