​​White Mold of Potato: Epidemiology and Management

May 2011 | 15 min., 17 sec.
by Dennis Johnson
Washington State University


​This presentation provides an overview of white mold, or Sclerotinia stem rot, of potato. It is intended to help growers, consultants, and students understand how white mold can be better managed by modifying the canopy environment and by timing control tactics based on the disease cycle. The presentation shows representative color images of the disease, explains the cause, and defines environmental and plant development factors that lead to development of the disease. White mold management tactics are discussed.

About the Presenter

Dennis Johnson Dennis Johnson is a professor and Extension plant pathologist at Washington State University. He received a BS degree in botany from Brigham Young University and MS and PhD degrees in plant pathology from the University of Minnesota. Dr. Johnson was an assistant plant pathologist at Texas A&M University, where he did research on diseases of small grains at the Texas Agricultural Experiment Station in Vernon. In 1980, he began working for Washington State University (WSU) at the Irrigated Agriculture Research and Extension Station in Prosser, where he specialized in epidemiology and management of diseases of potato, mint, onion, asparagus, hops, and sweet cherries. He transferred to the main WSU campus in 1993, where he teaches a graduate class in plant epidemiology and disease management and continues research and Extension activities on diseases of mint and potato. His research has been directed at developing practical disease management strategies.​

Contact Information:
Email: dajohn@cahnrs.wsu.edu


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