The Korean Journal of Pesticide Science (농약과학회지)

The Korean Society of Pesticide Science (한국농약과학회)
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The Change of Resistance of Phytophthora infestans to Metalaxyl and the Relationship with the Pathogenicity on Pepper Plants

국내 고추 역병균의 metalaxyl 저항성 변화 및 metalaxyl 저항성과 고추에 대한 병원성과의 상관 관계

  • 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)
  • 연초롱 (충북대학교 농업생명환경대학 응용생명환경학부 식물의학) ;
  • 이수민 (충북대학교 농업생명환경대학 응용생명환경학부 식물의학) ;
  • 김선보 (충북대학교 농업생명환경대학 응용생명환경학부 식물의학) ;
  • 민지영 (충북대학교 농업생명환경대학 응용생명환경학부 식물의학) ;
  • 김흥태 (충북대학교 농업생명환경대학 응용생명환경학부 식물의학)
  • Published : 2008.09.30
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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.

전국 고추재배 포장에서 2005년부터 2007년까지 3년간 분리한 151개의 고추 역병균을 가지고 연도별 metalaxyl에 대한 감수성 정도를 조사하였다. 그 결과 Phytophthora capsici에 대한 metalaxyl의 평균 $EC_{50}$ 값은 역병균을 채집한 3년 동안 2005, 2006, 2007년의 균주들이 1.454, 0.830, $0.323{\mu}g\;mL^{-1}$로 그 값이 감소하고 있었으며, 2007년에 채집한 균주에서는 저항성 병원균을 전혀 분리하지 못하였다. Metalaxyl에 저항성인 고추 역병균이 mandiproramid와 dimethomorph에 대해서 교차 저항성을 보이는 지를 조사한 결과, metalaxyl과 다른 두 약제 mandipropamid와 diinethomorph의 사이에는 전혀 상관관계가 없었다. 또한 metalaxyl에 대한 저항성은, 역병균의 균사 생장 속도와 고추에 대한 병원성과도 상관관계가 없었다.

Keywords

References

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