Abstract
The Westwide Pine Beetle Model provides a means to project the impact of 3 pine beetle species in FVS simulations of susceptible landscapes. The model simulates the movement of beetles (contagion) between the stands in the landscape, as well as to and from the forests of the "outside world" beyond this landscape. Incorporating the model's projections of beetle impacts on each stand in a section of the Net Perce National Forest results in a more rapid loss of pine basal area from the landscape than is projected by FVS alone. This successional change in species composition over time better matches the conditions observed in the real world. The spatial dynamics of the beetle infestation may be observed in the model results, as well as the importance of properly accounting for conditions in the "outside world".