1995 FOREST DISTURBANCE IN OREGON 



Root diseases & dwarf mistletoes 

 continue to cause subtle but 

 significant mortality and growth 

 losses. Swiss needle 

 cast on the coast 



IS a concern. 



Pollution from Portland 

 and other urban areas has 

 long-range effects on 

 lichens and forest 

 vegetation. 



Fire suppression 

 contributes to 

 overstocking, 

 species changes, 

 and increased risk 

 of disturbance 

 (fire, insects, 

 diseases). Over- 

 stocked stands 

 experiencing bark 

 beetle outbreaks. 



Western spruce 

 budworm and 

 tussock moth 

 outbreaks collapse 

 throughout state. 



New introductions of gypsy 

 moth in 1995. Established 

 exotics — balsam woolly adelgid, 

 white pine blister rust, 

 and Port-Orford-cedar 

 root disease — 

 continue to 

 kill trees. 



Pandora 

 moth 

 outbreak 

 collapses. 



Drought effects seen from the 

 past decade of below-normal 

 precipitation. Winter windstorms 

 and flooding cause localized mortality. 



Drought in the 

 late 1 980s and 

 early 1990s 

 contributes 

 to moisture 

 stress in over- 

 stocked stands. 





Overstocked 

 stands are 

 experiencing 

 bark beetle 

 outbreaks 

 and increased 

 insect and fire 

 susceptibility 

 — aggravated 

 by drought. 



Root disease 

 and mistletoe 

 losses increase 

 where fire 

 suppression and 

 past harvest 

 practices have 

 increased hosts. 



Fir engraver 

 and drought 

 cause mortality 

 in overstocked 

 white fir stands. 



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