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Monitoring for the Resistance of Strobilurin Fungicide Against Botrytis cinerea Causing Gray Mold Disease

Strobilurin계 살균제에 대한 잿빛곰팡이병균 Botrytis cinerea의 저항성 검정

  • Kim, Ah Hyeong (Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University) ;
  • Kim, Seon Bo (Sungbo Chemical) ;
  • Han, Ki Don (Sungbo Chemical) ;
  • Kim, Heung Tae (Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University)
  • 김아형 (충북대학교 농업생명환경대학 식물의학과) ;
  • 김선보 (성보화학(주)) ;
  • 한기돈 (성보화학(주)) ;
  • 김흥태 (충북대학교 농업생명환경대학 식물의학과)
  • Received : 2014.05.29
  • Accepted : 2014.06.30
  • Published : 2014.09.30

Abstract

This study was conducted to investigate the resistance of Botrytis cinerea to azoxystrobin, which belongs to strobilurin fungicides. The sensitivity of B. cinerea isolates, which were collected from infected pepper, strawberry, cucumber and tomato by a single spore isolation, to the fungicide was tested through a agar dilution method on PDA amended with fungicides and $100{\mu}g\;mL^{-1}$ of salicylhydroxamic acid (SHAM). All isolates of B. cinerea tested in this study were classified as a sensitive and a resistant group by $1.0{\mu}g\;mL^{-1}$ of $EC_{50}$ value to azoxystrobin. While the sensitive isolates accounted for 46.5% of B. cinerea population, the resistant ones did for 53.5%. According to the regions isolating B. cinerea, the highest isolation frequency was showed as 81.1% in Chungnam among the all. Among 4 host plants as pepper, strawberry, cucumber and tomato, the highest isolation frequency was obtained in strawberry, while the lowest was done in pepper. The isolate resistant to azoxystrobin showed the cross resistance to other fungicides included into strobilurins as kresoxim-methyl and trifloxystrobin. In spite of an excellent efficacy of strobilurins, it should be taken care to use them in the field, because of the high risk in the fields.

Strobilurin계 살균제인 azoxystrobin에 대한 잿빛곰팡이병균 Botrytis cinerea의 저항성 발현 여부를 조사하였다. B. cinerea 균주는 $1.0{\mu}g\;mL^{-1}$의 azoxystrobin에 대한 반응을 기준으로 실험 균주 중에서 46.5%가 감수성 균주로, 53.5%가 저항성 균주로 판명되었다. 병원균을 분리한 지역별로 저항성 균주의 출현 비율은 경기, 경남, 부산에서 28.6, 41.9, 36.8%이었으며, 충남에서 81.1%로 다른 지역보다 높게 나타났다. 기주별로 저항성 균주는 딸기, 오이, 토마토에서 분리한 균주에서는 각각 68.0, 40.0, 50.0%, 고추에서는 9.1%만이 나타났다. Azoxystrobin에 대해서 감수성이었던 B. cinerea 11-20은 kresoxim-methyl과 trifloxystrobin에 대해서도 감수성 반응을 보였으며, 저항성 균주인 11-74는 3종의 살균제 모두에 대해서 교차 저항성이 있음을 보여 주었다. 본 실험의 결과 실험에 사용한 B. cinerea 균주의 53.5%가 저항성 반응을 보일 정도로 높은 저항성 출현율을 보였으며, 동일 계열의 살균제에 대한 교차 저항성 반응을 보이고 있기 때문에, 포장에서 strobilurin계 살균제에 대한 철저한 관리가 요구되어진다.

Keywords

References

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