​​​​Brown Spot​

February 2013 | 15 min., 06 sec.
by Dennis A. Johnson
Washington State University


This presentation provides an overview of brown spot of potato. It is intended to help growers, consultants, and students to better understand the epidemiology of the disease and how it can be managed. The presentation shows representative color images of disease symptoms, the pathogen on potential overwintering substrates, and defines environmental and plant growth factors that lead to the development of the disease. The aggressiveness of the brown spot (Alternaria alternata) and early bight (Alternaria solani) pathogens are compared. Brown spot management tactics are discussed.​

About the Presenter

Dennis JohnsonDennis A. Johnson is 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 on the faculty and did research on small grain diseases at Texas A&M University before joining the Department of Plant Pathology at Washington State University in 1980. His research has been directed at developing practical management strategies for diseases of mint and potatoes.

Contact Information:
Email: dajohn@wsu.edu


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