ABSTRACT Campbell, Sally; Liegel, Leon, tech. coords. 1996. Disturbance 

 and forest health in Oregon and Washington. Gen. Tech. Rep. 

 PNW-GTR-381. Portland, OR: U.S. Department of Agriculture, 

 Forest Service, Pacific Northwest Research Station, Pacific 

 Northwest Region; Oregon Department of Forestry; Washington 

 Department of Natural Resources. 105 p. 



The scope and intensity of disturbance by such agents as Are, 

 insects, diseases, air pollution, and weather in Pacific North- 

 west forests suggests that forest health has declined in recent 

 years in many areas. The most significant disturbances and 

 causes of tree mortality or decline in Oregon and Washington 

 are presented and illustrated. We discuss the interrelations of 

 disturbance with forest management activities and the effect on 

 native trees and suggest some solutions for reducing the 

 severity of disturbance. One chapter reports on a forest health 

 monitoring pilot project. 



Keywords: Air pollution, diseases, disturbance, fire, forest 

 health monitoring, insects, vegetation change, weather damage. 



