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Best Management Tactics and Fungicide
Resistance in Alternaria Populations
(Early Blight and Brown Spot)

June 2015

By Lydia Tymon, M.S., Ph.D.
Department of Plant Pathology
Washington State University
Phone: 206-321-9216

Watch Presentation (10 min 26 sec)

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Summary: Broad-spectrum fungicides are the primary products used for the management of Alternaria. However, a shift to include narrow spectrum fungicides in rotation was made in order to minimize the impacts on mammal toxicity and alleviate environmental concerns due to chemical residues. Fungicide resistance must be taken into account when the chemical affects a single site and is repeatedly used. This presentation will provide consultants and growers with the best practices to manage early blight on potato. It will review fungicide basics, exhibit how quickly fungicide resistance develops, will briefly compare pathogenicity and aggressiveness of the early blight pathogen, A. solani, to the brown spot pathogen, A. alternata, and review best management tactics for early blight.

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