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The Change of Resistance of Phytophthora infestans to Metalaxyl and the Relationship with the Pathogenicity on Pepper Plants  

Yeon, Cho-Long (Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University)
Lee, Soo-Min (Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University)
Kim, Sun-Bo (Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University)
Min, Gi-Young (Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University)
Kim, Heung-Tae (Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University)
Publication Information
The Korean Journal of Pesticide Science / v.12, no.3, 2008 , pp. 270-276 More about this Journal
Abstract
Through the agar dilution method on V-8 juice agar, sensitivity of Phytophthora capsici causing pepper Phytophthora blight to metalaxyl was investigated by using isolates obtained from infected pepper plants during 3 years from 2005 to 2007. By the lapse of time, $EC_{50}$ value to metalaxyl was decreased, showing 1.45, 0.83, and $0.32{\mu}g\;mL^{-1}$ in 2005, 2006, and 2007. None of 2007 isolates was found to be resistant to metalaxyl. Compared the sensitivity of P. capsici isolates to metalaxyl with those to mandipropamid and dimethomorph, there is not a cross resistance response between metalaxyl and mandipropamid/dimethomorph. The resistance to metalaxyl in pepper Phytophthora blight pathogen was not related with the mycelial growth on V-8 agar medium and the pathogenicity on pepper plants.
Keywords
Cross resistance; Metalaxyl; Pathogenicity; Phytophthora capsici;
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