fir trees

RVWithTito, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=8771491

It's not that hotter and drier summers kill trees by themselves.  But when winters are mild, creatures that kill the trees don't die, and continue to feast upon them. 

That appears to be at least part of what is happening to Douglas firs, particularly in Oregon.  Flatheaded fir borers have killed trees by the tens or thousands, by BLM counts. 

Bill Schaupp is an entomologist at the Forest Health Protection office of the U.S. Forest Service, and well-versed in tree-killing bugs. 

David Douglas and the Douglas-Fir

Jul 1, 2005

Douglas-fir trees grow abundantly in Northern California and Southern Oregon. Its wood, one of the hardest softwoods, is a favorite framing timber, while appearance grade lumber makes handsome finish work. The tree is significant to the Northwest economy, but what of the man for whom the tree was named?