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http://dx.doi.org/10.7585/kjps.2013.17.2.133

Sensitivity of Sclerotium cepivorum Causing Garlic White Rot Isolated from Taeahn, Seosan and Goheung Areas to Fungicides  

Kim, Hyung Jo (Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University)
Choi, Woobong (Department of Biotechnology and Bioengineering, Dongeui 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.17, no.2, 2013 , pp. 133-139 More about this Journal
Abstract
To investigate the sensitivity of Sclerotium cepivorum causing garlic white rot to 5 fungicides, including prochloraz, tebuconazole, flutolanil, iminoctadine and isoprothiolane, 147 isolates isolated from infected garlics from 2008 to 2009 through a single sclerotium isolation were screened. While each mean value of $EC_{50}$ (effective concentration reducing mycelial growth by 50%) of S. cepivorum isolates collected in 2008 to each fungicide was 0.054, 0.012, 23.189, 0.901, and $21.362{\mu}g\;mL^{-1}$, that of 2009 isolates were 0.030, 0.020, 10.367, 1.684, $33.406{\mu}g\;mL^{-1}$. There was a difference in mean value of $EC_{50}$ of S. cepivorum according to regions isolated. $EC_{50}$ values of S. cepivorum isolated in Goheung to flutolanil and isoprothiolane were 14.468 and $24.653{\mu}g\;mL^{-1}$, respectively, which was lower than those of Seosan and Taeahn. Isolates from Taeahn showed the lowest $EC_{50}$ value to prochloraz as $0.008{\mu}g\;mL^{-1}$. In addition, we could not find any resistant isolates to fungicides tested. The $EC_{50}$ values in this study will be used in a fungicide resistance monitoring program to determine whether shifts in sensitivity to fungicides included into different groups are occurring in S. cepivorum populations.
Keywords
garlic white rot; Sclerotium cepivorum; detection of fungicide response;
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