The state’s park department says they are experiencing an outbreak of Douglas-fir tussock moth caterpillars at Hyde Memorial ...

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.

For instance, Douglas-fir beetles will attack Douglas fir trees; Western pine beetles will attack ponderosa pine trees; and mountain pine beetles can attack a small range of different pine trees.

This tree work video takes you through the process of safely climbing and felling a dead Douglas Fir. Watch as the expert tree climber navigates the branches, ensuring every step is calculated for ...

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.

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.

All my life I’ve been hearing about Douglas firs. Who was Douglas, and why does he get to have a tree named after him? —Fir Burger Behold the mighty Douglas-fir, a tree whose story is as rich ...

Signs of Douglas Fir Tussock Moth Damage Tussock moth caterpillars start feeding on fresh, new growth at the tops of trees. The visible damage appears at the crown and progresses down the tree.

Thanks for writing in, Bert. We at the Garden often speak about planting trees and shrubs that are best suited for our Chicago-area climate. The tree in your photo appears to be a Douglas fir ...

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.

Old growth Douglas fir trees stand along the Salmon River Trail on the Mt. Hood National Forest outside Zigzag, Ore., on June 25, 2004. A new study from Oregon State University researchers finds ...

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 new study by the ...