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Establishment of Baseline Sensitivity of Phytophthora capsici Causing Pepper Phytophthora Blight to Carboxylic Acid Amide Fungicides  

Kim, Jin-Ho (Department of Plant Medicine, College of Agriculture, Life Science and Environment, Chungbuk National University)
Kim, Joo-Hyung (Department of Plant Medicine, College of Agriculture, Life Science and Environment, Chungbuk National University)
Lee, Kyeong-Hee (Environment-Friendly Agriculture Research Division, Chungbuk Agricultural Research and Extension Services)
Rho, Chang-Woo (Environment-Friendly Agriculture Research Division, Chungbuk Agricultural Research and Extension Services)
Kim, Heung-Tae (Department of Plant Medicine, College of Agriculture, Life Science and Environment, Chungbuk National University)
Publication Information
The Korean Journal of Pesticide Science / v.14, no.4, 2010 , pp. 456-462 More about this Journal
Abstract
Baseline sensitivity to benthiavalicarb, iprovalicarb and dimethomorph included into carboxylic acid amide (CAA) group was evaluated in 180 isolates of Phytophthora capsici over 4 years from 2005 to 2008. $EC_{50}$ (effective concentration inhibiting mycelial growth by 50%) value of benthiavalicarb ranged from $0.015{\mu}g\;mL^{-1}$ to $0.049{\mu}g\;mL^{-1}$ with a mean of $0.033{\mu}g\;mL^{-1}$. The mean values of $EC_{50}$ of iprovalicarb and dimethomorph were 0.411 (0.197 - 0.556) ${\mu}g\;mL^{-1}$ and 0.271 (0.101 - 0.798) ${\mu}g\;mL^{-1}$, respectively. Although there was no increasing tendency in $EC_{50}$of benthiavalicarb and iprovalicarb during 4 years, $EC_{50}$ of dimethomorph was increased gradually by laps of time. There was no cross-resistance between each fungicide used in this study and metalaxyl. Among fungicides included into CAA group, there was a positive correlation between benthiavalicarb and iprovalicarb, and between dimethomorp and mandipropamid.
Keywords
Phytophthora capsici; baseline sensitivity; benthiavalicarb; iprovalicarb; dimethomorph;
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Times Cited By KSCI : 6  (Citation Analysis)
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