How to protect your trees from bark beetles 03:03. As Colorado experiences its signature whiplash weather, arborists are warning that stressed trees are more vulnerable to pests and diseases.

Pine trees are one of the most common coniferous species in North America. ... The tree's bark is either dark or light grey and becomes checked with age. 3. of 13. Sugar Pine .

But by 2016, over half of the trees still standing were husks of their former selves, their fate signaled by flaming red needles, and then, ghostly gray trunks with no branches at all.

The whitebark pine tree is a staple of Alpine ecosystems in western North America.These forests cover more than 80 million acres of land in two Canadian provinces and seven U.S. states, including ...

The herbivores in this study were large pine weevils (Hylobius abietis L.), common pests in European coniferous forests that feed on tree bark and kill young seedlings.Clearcutting of forests ...

Pine trees make needle drop easy to notice because they often have an open branching habit. Because pine needles grow — and fall — in bundles of two or more, the loss may be especially obvious.