Changes of metalaxyl sensitivity of Phytophthora infestans isolated from potato fields of Gangwon area

강원지역 포장에서 분리한 감자 역병균 (Phytophthora infestans) 의 metalaxyl에 대한 감수성 변화

  • Zhang, Xuan-Zhe (Department of Applied Plant Science, Kangnung National University) ;
  • Chung, Eun-Kyung (Department of Applied Plant Science, Kangnung National University) ;
  • Lee, Youn-Su (Department of Applied Plant Science, Kangwon National University) ;
  • Kim, Byung-Sup (Department of Applied Plant Science, Kangnung National University)
  • 장현철 (강릉대학교 식물응용과학과) ;
  • 정은경 (강릉대학교 식물응용과학과) ;
  • 이윤수 (강원대학교 식물응용과학부) ;
  • 김병섭 (강릉대학교 식물응용과학과)
  • Published : 2003.03.27

Abstract

Changes of control effect of metalaxyl to potato late blight caused by Phytophthora infestans were examined in potato fields in 2001 and 2002. Control efficacy of metalaxyl was similar to those of dimethomorph and ethaboxam. About 4.9% of the fungal isolates exanlined in 2001 were resistant, 87.8% were intermediate, and 7.3% were sensitive to metalaxyl. Among the isolates collected in 2002, 20.1 % were resistant, 75.5% were intermediate, and 4.3% were sensitive to the chemical. However, most of resistant isolates were isolated from Pyongchanggun Hoenggae area. Eighty eight isolates collected in 2001 were all A1 mating type, while both A1 and A2 mating types were found in 2002. About 85.6% of the isolates collected in 2002 were A1 mating type, but all the rest (A2 mating type) was isolated from Hoenggae area. Increased control efficacy of metalaxyl to potato late blight might be caused by the increase of moderately resistant and sensitive isolates with decreasing the resistant isolate, and the decreased population of A2 mating type which is resistant to metalaxyl.

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