SALEM, Ore. – Researchers are taking to the skies this month to survey Oregon’s forests for damage from pests and other threats, according to the Oregon Department of Forestry and USDA Forest Service. Forest officials said that the Pacific Northwest Aerial Detection Survey is the longest continuous annual survey of its kind in the U.S. Airborne researchers use fixed-wing aircraft to identify trees in distress, flying between 1,500 to 2,500 feet above ground. “Oregon has about 30 million acres of forest so flying in a grid pattern over it allows us to find problems even in remote areas hard to reach by vehicle or on foot,” said Christine Buhl, ODF Forest Entomologist. The survey has highlighted a concerning trend of increasing tree deaths due to drought stress and beetle attacks.