Forest conditions on public and private land are assessed annually by U.S. Forest Service Forest Health Protection personnel in cooperation with WSFD. Reconnaissance flights record host species, causal agent, and an estimate of percentage of trees affected. Surveys are typically conducted between June and September. Results are shared with private landowners, WSFD District Foresters, USDA Forest Service’s Forest Health Management and Forest Health Technology Enterprise Team.
Due to the nature of aerial surveys, this data will only provide rough estimates of location, intensity and the resulting trend information for agents detectable from the air. Many of the most destructive diseases are not represented in the data because these agents are not detectable from aerial surveys. The data presented should only be used as a partial indicator of insect and disease activity, and should be validated on the ground for actual location and causal agent. The insect and disease data is available digitally from the USDA Forest Service, Region Two Forest Health Management group. The cooperators reserve the right to correct, update, modify or replace GIS products. Using this data for purposes other than those for which it was intended may yield inaccurate or misleading results.