“The driving factor (in the tree’s decline) is that white pine blister rust, and that’s working synergistically with mountain pine beetle, the altered fire regime, climate change,” Abbott ...

Pinus contorta is prolific throughout the Cascades and the Sierra Nevada and extends to southern California. It is a pine tree of the mountains and grows to an elevation of 11,000 feet.

including this 1500-year-old [bristlecone] tree that had succumbed. I’m no beetle expert, but it looked to me like possibly mountain pine beetle had infected it,” Kitchen said. “There were ...

The mountains (such as the highest ... and blazing sunshine, but some trees specialise in these conditions. Some, like the Scots pine, have become iconic; others, like the willows, are less ...

Ten thousand feet up in the White Mountains of central California ... article misidentified the species of tree shown. It was a single-leaf pinyon pine, not a bristlecone pine.

The resulting outbreak painted expanses of green mountains reddish-orange and gray as the beetles killed countless pine trees across the region. Colorado’s popular recreation areas were hit ...

Earth’s oldest, knotted and scarred pine trees are a boon for forest ... different areas of the Spanish Pyrenees mountains. The duo calculated the trees’ ages based on tree trunk girth.

A peak in the middle background is Needham Mountain, where another Jeffrey pine was observed at very high elevation, underlining that this is not simply an anomaly on Mount Kaweah. (Hugh Safford, UC ...

As you might be aware, El Paso County and much of Colorado is seeing an uptick in mountain pine beetle (MPB) activity. MPB is a native insect that usually attacks weaker trees as part of a natural ...

For more than 5,000 years, a stand of whitebark pine trees in the Beartooth Mountains were preserved in an ice patch. During an ancient warm period, the trees had grown at an elevation above ...

A critical species to the ecosystem is facing a variety of threats. This Earth Day, ABC News is taking a look at solutions for issues related to climate change and the environment with the series ...