Douglas fir dieback, caused by drought and insects, has spread from southwest Oregon into the Willamette Valley in a major ...

White fir trees are part of the pine family, with a tall pyramidal form that brings a regal mountain magnificence to residential landscapes. This hardy evergreen conifer is lauded for its soft ...

The rapid decline of our largest and most prolific tree in the Pacific Northwest andmost important tree species to the ...

Perhaps you’ve inherited a mature Douglas fir canopy. Or, maybe your garden was sunnier a few years ago, but as nearby trees ...

In 2008, scientist Bryan Black took core samples the diameter of a pencil from a forest near the north Oregon coast. Most of the trees were hemlocks and Douglas fir that had been undisturbed for about ...

The University of Oregon claims approximately 4,000 different trees, over 500 species, stretch their branches across ...

Add Yahoo as a preferred source to see more of our stories on Google. Balsam fir mortality could increase if climate change gets worse, according to new research from the University of New Brunswick.

HOUGHTON LAKE, Mich. – An invasive insect that kills fir trees has been found in Roscommon County, marking the fifth Michigan ...

How smart are you? Well, then, what is the most common tree species in Maine? If you thought pine, you are wrong, even though we are called the Pine Tree State. Or, if you said the white birch, you’re ...

Trees are a big deal on the University of Oregon campus in Eugene.