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


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.

주요 마늘 재배지인 서산, 태안, 고흥에서 2008년과 2009년에 채집한 병든 마늘로부터 단균핵 분리를 통하여 총 147개의 흑색썩음균핵병균 Sclerotium cepivorum 균주를 분리하여 살균제에 대한 감수성 정도를 조사하였다. 실험에는 현재 방제를 위하여 사용하고 있는 prochloraz, tebuconazole, flutolanil, iminoctadine, isoprothiolane 등 5종의 살균제를 선발하여 한천희석법으로 살균제에 대한 병원균의 감수성 정도를 조사하였다. Prochloraz, tebuconazole, flutolanil, iminoctadine, isoprothiolane에 대한 병원균의 평균 $EC_{50}$값을 연도별로 비교하여 보면, 2008년에는 각각 0.054, 0.012, 23.189, 0.901, $21.362{\mu}g\;mL^{-1}$이었으며, 2009년에는 0.030, 0.020, 10.367, 1.684, $33.406{\mu}g\;mL^{-1}$이었다. Flutolanil에 대한 평균 $EC_{50}$값은 2008년에 확보한 균주에 비하여 2009년에 확보한 균주 집단에서 현저히 감소하였다. 반면 iminoctadine과 isoprothiolane에 대해서는 2008년 균주 집단의 $EC_{50}$값보다 2009년 균주 집단의 $EC_{50}$값이 더 증가하였다. 병원균 분리 지역 간의 $EC_{50}$값을 비교하여 보면 고흥 지역에서 분리한 병원균 집단의 flutolanil과 isoprothiolane에 대한 $EC_{50}$값이 14.468과 $24.653{\mu}g\;mL^{-1}$로 서산과 태안에서 분리한 병원균 집단보다 낮았으며, prochloraz에 대해서는 태안 지역에서 분리한 균주의 집단이 $0.008{\mu}g\;mL^{-1}$로 가장 낮았다. 현재 마늘 흑색썩음균핵병방제를 위하여 사용하고 있는 5종의 살균제에 대해서 국내에서 분리한 S. cepivorum 균주 집단에는 저항성을 보이는 균주는 찾아 볼 수 없었다.


Supported by : 충북대학교


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