In the hills around the Willamette Valley, foresters have been seeing stressed Douglas-fir trees come down with a disease called Swiss needle cast. The disease produces a pale overall appearance ...

To successfully identify a Fraser fir, you should know how to identify a fir tree in general ... which helps reduce the threat of a disease infestation. Yearly maintenance includes watering ...

Courtesy of Oregon State University A new survey finds a growing number of Douglas fir trees in the Oregon Coast Range have been infected over the past decade with the fungal disease known as ...

It was known to spread to fir trees in Europe, but that hadn’t been seen in the state. Related: A Disease That’s Felled Forests in California and Oregon Shows up in Washington The European ...

Adamo said she had a "realistic hunch" that she should study the effects of balsam fir trees on Ixodes scapularis, the blacklegged tick that is a vector for Lyme disease. First discovered in ...

A boundary has been set up in Cumbria to try help prevent the spread of a tree disease. Phytophthora pluvialis ... pathogen affects trees like Douglas fir, western hemlock, and several pine ...