Forest Health News 2018
Tree Mortality Summary of WESTERN BARK BEETLES Now Available
By Jeanine Paschke, USDA Forest Service Contractor
The summary of areas with tree mortality from bark beetles in the Western US from 2000 – 2017 is now available. The findings show a 26.3 million acre footprint for mountain pine beetle and a 55.6 million acre footprint for all western bark beetles over the past 18 years. Many areas of pest activity overlap from year to year. The footprint areas are the cumulative area covered by pest activity with no double counting of acres between years. In total, 24 species of bark beetles were included in the calculation. Complexes, insect/disease and other multi damage phenomena that contain a bark beetle component like five-needle pine decline, subalpine fir mortality, true fir pest complex, and pinyon pine mortality are also included.