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

서산, 태안 및 고흥 지역에서 마늘 흑색썩음병을 일으키는 Sclerotium cepivorum의 살균제 감수성 조사

  • 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)
  • 김형조 (충북대학교 농업생명환경대학 식물의학과) ;
  • 최우봉 (동의대학교 생명공학과) ;
  • 김흥태 (충북대학교 농업생명환경대학 식물의학과)
  • Received : 2013.06.01
  • Accepted : 2013.06.22
  • Published : 2013.08.30

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.

Acknowledgement

Supported by : 충북대학교

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