Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Occurrence of Bunch Rot Disease Caused by Aspergillus tubingensis on Shine Muscat Grape

Aspergillus tubingensis에 의한 샤인머스켓 포도송이썩음병(가칭)의 발생

  • Kim, Young Soo (Department of Plant Medicals, Andong National University) ;
  • Kwon, Hyeok Tae (Department of Plant Medicals, Andong National University) ;
  • Hong, Seung-Beom (Korean Agricultural Culture Collection, Agricultural Microbiology Division, National Academy of Agricultural Science, Rural Development Administration) ;
  • Jeon, Yongho (Department of Plant Medicals, Andong National University)
  • 김영수 (국립안동대학교 식물의학과) ;
  • 권혁태 (국립안동대학교 식물의학과) ;
  • 홍승범 (국립농업과학원 농업미생물과) ;
  • 전용호 (국립안동대학교 식물의학과)
  • Received : 2019.12.18
  • Accepted : 2019.12.24
  • Published : 2019.12.31
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Abstract

During the year 2018, the symptoms of bunch rot on Shine Muscat (Vitis vinifera L.) were observed in Kimcheon-si, Gyeongbuk province in Korea. The disease appears on the Shine Muscat as a black rot due to prolific fungal sporulation after it has invaded into the Shine Muscat which look completely empty and dryness. Colonies of these fungi are present on the Shine Muscat skin from fruit setting and increase in amount from early season to harvest, while become peak at ripening stage. To isolate the causal agent, small fragments (2 to 3 mm) of decayed tissue from the lesion margin were placed onto potato dextrose agar (PDA) plates. Fungal colonies on PDA produced dense white aerial mycelium and then covered with dark black conidial heads. These heads were large and radiate, and vesicles were globose (2.12-32.0×2.0-3.1 ㎛). Based on morphological and cultural characteristics, this fungus was identified as Aspergillus tubingensis. To confirm its identity, the internal transcribed spacer, β-tubulin, and RNA polymerase II was sequenced for molecular identification. BLAST search indicated 99% identity with A. tubingensis. The pathogenicity test on healthy grape of Shine Muscat produced bunch rot, as the original symptoms. To select effective fungicides for the control of brunch rot, an in vitro antifungal activity of seven fungicides were evaluated against the growth of A. tubingensis. Five fungicides (dipenoconazole, tebuconazole, metconazole, iminoctadine, and captan) exhibited significantly strong suppression of the mycelial growth of A. tubingensis.

2018년 경북 김천 지역 포도 하우스 재배 농가에서 포도송이가 무르고 마른 포도 과실이 낙과되는 피해가 발생하였다. 병반 표면에는 검갈색의 곰팡이 포자가 형성된 것을 확인할 수 있었으며, 이병과실에서 병원균을 분리하여 균학적 특징 및 염기서열 분석결과 병원균은 Aspergillus tubingensis로 동정하였다. 이 증상의 원인균을 증명하기 위해 이병과실에서 병원균을 분리하여 병원성 검정을 수행한 결과, 고온으로 갈수록 급격히 병이 진전되고 하우스에서 발생한 병징과 일치하였다. 또한, 포도송이 썩음 병원균에 대하여 화학농약 약제의 선발을 통해 병원균의 확산을 막고 예방을 하고자 단제 7종 균사생장 억제 효과 검정을 실시하였다. Dipenoconazole, tebuconazole, metconazole, iminoctadine, captan 5가지의 약제에서 균사생장 억제 효과가 확인되었다. A. tubingensis에 의한 포도송이썩음병(가칭)은 2018년도부터 국내 샤인머스켓 포도에 처음 발생되고 있음을 보고하고, 효과적으로 포도송이썩음병의 발생을 예방할 수 있는 5종의 약제를 보고한다.

Keywords

References

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