User's manual for western root diseases model /

Effects of Armillaria spp. or Phellinus weirii on stand dynamics are represented by the Western Root Disease Model.This model, which operates in conjunction with the Prognosis Model for Stand Development, can be used to evaluate effects of a wide assortment of silvicultural prac- tices, including stump removal for disease reduction.The model was developed through a series of workshops de- signed to elicit information about the disease process from many experts on the biology of the root diseases and their hosts.Forest land managers also participated in the work- shops to provide their insight into the values and resources being affected.This publication contains model applications, a brief de- scription of how the model is formulated, and documentation of the keyword procedures for using the model.