Response to metalaxyl of Phytophthora capsici isolates collected in 2005 and 2006

2005년과 2006년에 채집한 고추 역병균(Phytophthora capsici)의 Metalaxyl에 대한 약제 반응

  • Kim, Sun-Bo (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) ;
  • 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)
  • 김선보 (충북대학교 농업생명환경대학 응용생명환경학부 식물의학) ;
  • 이수민 (충북대학교 농업생명환경대학 응용생명환경학부 식물의학) ;
  • 민지영 (충북대학교 농업생명환경대학 응용생명환경학부 식물의학) ;
  • 김홍태 (충북대학교 농업생명환경대학 응용생명환경학부 식물의학)
  • Published : 2007.12.30

Abstract

It was the investigated the response to metalaxyl of Phytophthora capsici isolates collected in 2005 and 2006. With effective concentrations ($EC_{50}$) of metalaxyl causing 50% growth inhibition, resistance baseline was determined as more than $1.0\;{\mu}g\;mL^{-1}$. Based on the resistance baseline, isolation frequency (%) of P. capsici resistant to metalaxyl was 29.0% and 218% in 2005 and 2006, respectively. Among the isolates of P. capsici obtained in 2006, the isolation was variable; 33.3% in Chungnam, 26.3% in Chungbuk and 11.1% in Gyeongbuk. Two isolates of metalaxyl-sensitive (MS) and too isolates of metalaxyl-resistant (MR) P. capsici were selected and then used to investigate the activity of metalaxyl to their development stages. Even though there was a difference in mycelial growth inhibition by metalaxyl between MS and MR isolates, the fungicide was not active or nearly to sporangium germination, zoospore release, and zoospore germination of both MS and MR isolates. However, the fungicide showed weak activity against sporangium germination and zoospore release of P. capsici, not related with its resistance. Also, it was not inhibitory to zoospore germination of both resistant and sensitive isolates. In a greenhouse test, it showed 100% of control value against P. capsici 06-86 sensitive to metalaxyl, when it was applied by soil-drenching at $25\;{\mu}g\;mL^{-1}$. However, 06-130 and 16-155 resistant to metalaxyl showed less than 20% of control value.

Keywords

pepper Phytophthora blight;metalaxyl;fungicide resistance

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