식물병연구 (Research in Plant Disease)

한국식물병리학회 (The Korean Society of Plant Pathology)
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Microstroma juglandis에 의한 호두나무 흰곰팡이병 발생

Occurrence of Downy Leaf Spot on Juglans regia Caused by Microstroma juglandis in Korea

  • 이상현 (국립산림과학원 산림병해충연구과) ;
  • 이승규 (국립산림과학원 산림병해충연구과) ;
  • 박지현 (고려대학교 환경생태공학부) ;
  • 조성은 (고려대학교 환경생태공학부) ;
  • 신현동 (고려대학교 환경생태공학부)
  • Lee, Sang-Hyun (Division of Forest Diseases and Insect Pests, Korea Forest Research Institute) ;
  • Lee, Seung-Kyu (Division of Forest Diseases and Insect Pests, Korea Forest Research Institute) ;
  • Park, Ji-Hyun (Division of Environmental Science and Ecological Engineering, Korea University) ;
  • Cho, Sung-Eun (Division of Environmental Science and Ecological Engineering, Korea University) ;
  • Shin, Hyeon-Dong (Division of Environmental Science and Ecological Engineering, Korea University)
  • 투고 : 2011.09.04
  • 심사 : 2011.09.29
  • 발행 : 2011.12.31
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초록

2011년 6월에 김천과 무안의 호두나무 재배지에서 잎에 노균병 병징과 유사한 증상이 관찰되었다. 병든 잎의 뒷면에는 다각형의 병반에 흰색의 곰팡이가 눈꽃처럼 형성되었고, 상응하는 잎의 앞면에는 퇴록 부분이 생겼다. 병세가 진전되면서 병든 조직은 붕괴되었고 나중에는 괴사되었다. 이 병의 원인균은 형태적 및 배양적 특징으로 보아 Microstroma juglandis로 동정되었다. 또한 균주의 ITS rDNA 염기서열을 GenBank에 등록된 M. juglandis의 자료와 비교하여 100% 일치함을 확인하였다. 호두나무 묘목에 병원성 검정을 실시하여 코흐의 원칙을 만족시켰다. 이 병은 지금까지 북미, 유럽, 오세아니아 그리고 서아시아(인도, 파키스탄, 터키)에서 보고되었다. 이 연구를 통하여 한국을 포함한 동아시아에서는 이 병을 처음으로 보고하며, 병명은 '호두나무 흰곰팡이병'으로 제안한다.

In June 2011, walnuts (Juglans regia) from orchards in Kimcheon and Muan, in southern Korea, were found to exhibit downy mildew-like symptoms of a foliar disease. Whitish polygonal efflorescence was produced on the abaxial surface of affected leaves and discolored light green blotches on the corresponding adaxial surfaces. In the later stage of disease development, diseased tissues collapsed and became necrotic. Based on morphological and cultural characteristics, the causal fungus was identified as Microstroma juglandis. The sequence of ITS rDNA of the present isolate showed 100% similarity with those of M. juglandis obtained from GenBank databases, thus confirming its identity. Pathogenicity tests were conducted on leaves of walnut seedlings, fulfilling Koch's postulates. The disease has been previously reported in North America, Europe, Oceania and some western Asia. This is the first report of downy leaf spot on walnuts in East Asia.

키워드

참고문헌

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