Armillaria root disease in conifers of western North America

Abstract

Armillaria root disease, the most common forest root disease in western North America, affects all tree species to some degree and is one of the most complex forest problems to understand and effectively manage. In 1870, Robert Hartig, the father of forest pathology, was one of the first scientists to investigate the disease in Europe. A century later, after a long history of disease observation, research, and treatment, Lewis Roth, a professor of forest pathology at Oregon State University, highlighted the frustration associated with studying the disease by writing, “Armillaria has a history of refractiveness to experimentation.”

Citation

Filip, Gregory M.; Klopfenstein, Ned B.; Maffei, Helen M.; Shaw, Charles G., III; Lockman, Blakey. 2024. Armillaria root disease in conifers of western North America. Forest Insect and Disease Leaflet 188. Washington, D.C.: U.S. Department of Agriculture, Forest Service. Forest Health Protection. 23 p.