For the last five years a focused effort has been undertaken by the USDA Forest Service in the development and refinement of a decision support system for gypsy moth management. This system, called GypsES, contains mapping capabilities, database management, a forest stand damage prediction model, and the USDA Forest Service aerial spray prediction model FSCBG for the prediction of deposit and drift effects from gypsy moth spray projects. GypsES is being developed by the USDA Forest Service, Northeastern Forest Experiment Station and State & Private Forestry represented by the Northeastern Area, Region 8 and Washington Office Forest Health Technology Enterprise Team - Davis.