CORVALLIS, Ore. (KTVZ) – Increases in mortality among Douglas firs in the Klamath Mountains are the result of multiple factors that have the iconic tree in a “decline spiral” in parts of the region, a ...

Increases in mortality among Douglas-fir in the Klamath Mountains are the result of multiple factors that have the iconic tree in a 'decline spiral' in parts of the region. Increases in mortality ...

Douglas-fir trees will likely experience more stress from drier air as the climate changes than they will from less rain, computer modeling by Oregon State University scientists shows. The research is ...

Observers who are noticing dying conifer trees around the Roaring Fork River watershed can blame the Douglas-fir beetle. The valley has avoided many of the insect infestations that have decimated ...

A decade-long die-off of Douglas fir trees centered in southwest Oregon has recently accelerated, potentially requiring forestland owners to change management strategies, experts say. Over the past 10 ...

Amid a years-long drought and insect infestation, Douglas fir have entered what scientists are calling a “decline spiral” in southwest Oregon. A study by Oregon State University faculty published in ...