Dr. Steven Johnson from the University of Maine. This presentation will help consultants, extension agents, growers, and other practitioners in the potato-producing states to understand more about phosphorous acid and its use in potato post-harvest situations. Specifically in this presentation, practitioners will learn the differences between phosphorus containing compound used in agriculture, what pathogens are controlled by phosphorous acid, and how to apply the material onto potatoes entering storages. By the end of this presentation, the practitioner should increase their knowledge of phosphorous acid and how to best use it in potato post-harvest situations for optimal disease control.