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Chemical Control of Foliar Plant Diseases
in Potato: Application of Fungicides

September 2013

By Philip B. Hamm
Professor of Plant Pathology
Oregon State University
Phone: 541-567-8321 Ext.110

Watch Presentation (48 min 42 sec)

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This presentation will help consultants, growers, and other practitioners where ever potatoes are produced. Foliar fungicides are commonly used to protect potatoes from a number of devastating foliar diseases, particularly late blight. Knowing the factors that contribute to the best application (most product applied) regardless of method (air, ground or chemigation) will help to ensure the best protection, for the longest time period, and save money. Information will be presented detailing where fungicides can be found in the potato canopy following application by the different methods, how much of the material applied still remains by canopy level nearly a week later, and what are the results of repeated applications related to fungicide amount through time. Information is shared provided on how fungicide amounts can be increased by some application methods, what increasing or decreasing water amounts used during application impact or not, fungicide deposition, and why timing of application is important to get the best disease control possible.

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