The Douglas fir, the state tree of Oregon, can grow incredibly tall and live impressively long. The oldest Douglas fir trees have lived to be over 1,000 years old.

Douglas fir is the most abundant tree species in the Pacific Northwest. It’s Oregon’s official state tree. And it’s arguably the region’s most important timber species.

If your gorgeous Douglas fir is looking sickly or defoliated, there’s one pest you’d better check for, and fast! We show you how to tackle the Douglas fir tussock moth ...