The balsam woolly adelgid, a tiny nonnative flightless insect, is spreading across the American West killing subalpine fir in northern Utah's recreation-heavy mountain ranges and canyons. Rsearchers ...

Imagine yourself walking quietly through a high-elevation subalpine forest. You feel immersed in shady stillness while enveloped by a fresh scent of pine, spruce and fir. You gaze out at the trees ...

A tagged subalpine fir tree, one of more than 5,000 marked trees monitored as part of this 37-year-long study in the Colorado subalpine forest on Niwot Ridge, west of Boulder. Disclaimer: AAAS and ...

Observers who are noticing dying conifer trees around the Roaring Fork River watershed can blame the Douglas-fir beetle. The valley has avoided many of the insect infestations that have decimated ...

ALTA, Utah — During an educational event at Alta Ski Resort, a certified arborist took skiers on a field trip to learn about the importance of protecting Utah’s trees. Ian Peisner led the "Trees and ...