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Post-Harvest Applications of Phosphorous Acid Materials for Control of Phytophthora infestans and Phytophthora erythroseptica on Potatoes

Author(s): Steven B. Johnson

Journal: Plant Pathology Journal
ISSN 1812-5387

Volume: 7;
Issue: 1;
Start page: 50;
Date: 2008;
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Keywords: pink rot | late blight | Solanum tuberosum | potato storage

The purpose of this study was to determine the value of select phosphorous acid materials compared to existing post-harvest materials in preventing tuber-to-tuber spread of Phytophthora infestans and Phytophthora erythroseptica during the mechanical harvesting and tuber transfer in a situation where the diseases are present at harvest. Products evaluated over two seasons were Phostrol, Rampart and ProPhyt; these were tested against Oxidate and Agclor 310 for control of late blight and pink rot. Tubers were treated with the control materials one or three hours post inoculation. Oxidate and Agclor 310 were ineffective in controlling either P. infestans or P. erythroseptica. All tested phosphorous acid materials provided complete control of both tested pathogens in 2005 and in 2006. In a second test, less than labeled rates provided less than complete control of P. infestans. Phosphorus acid materials have potential for post-harvest control of late blight and pink rot.
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