A small invasive pest known for killing trees in North America was spotted in three new locations in the Willamette Valley.

Add Yahoo as a preferred source to see more of our stories on Google. A western pine beetle rests on a sap mound on a pine tree. - Charles Wollertz/Getty Images A thriving pine tree is a thing of ...

Ron Durbin, who trekked with a group into a rugged Santa Clarita canyon, quickly spotted nearby trees pockmarked with D-shaped “exit holes,” a deadly calling card. This was the work of the goldspotted ...

A Colorado nonprofit is working to help landowners fight back against growing infestations of mountain pine beetles and ...

Nature gives rise to fascinating adaptations, which can sometimes lead to organisms living in some strange situations. The relationship between bark beetles, spruce trees, and a type of fungus is a ...

This camera trap recorded two stag beetles moving across a moss-covered tree trunk in a forest environment. One individual displays the enlarged mandibles that stag beetles are known for, while the ...

Bark beetle-infested spruce trees begin to dry out already before any visible signs of tree mortality appear, a recent study shows. Bark beetle-infested spruce trees begin to dry out already before ...

As wonderful as the shade of old neighborhood trees can be, certain tree types are especially at risk of an infestation ...

The emerald ash borer's larvae attack trees from within. Beech leaf disease from nematodes attack beech trees; Various fungal ...

As Colorado experiences its signature whiplash weather, arborists are warning that stressed trees are more vulnerable to pests and diseases. Peel back the bark, and you may find a predator in your ...

Intensifying drought and above-average temperatures allowed native bark beetles to run rampant in New Mexico’s forests in ...