GENERAL TECHNICAL REPORT PNW-GTR-870mountain pine beetle are able to maintain epidemics after re- Key Information Needsturn to normal conditions, whereas others such as pinyon ips ??? Improved monitoring of biotic disturbance agents; moredecline with alleviation of drought stress (Raffa et al. 2008). accurate quantification of the extent, severity, and types of effects to forests from biotic distu