Fungicide selections for control of chili pepper stem rot caused by Sclerotium rolfsii using an agar dilution method

  • Lee, Soo Min (Department of Plant Medicine, College of Agriculture, Life and Environment Science, Chungbuk National University) ;
  • Min, Jiyoung (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)
  • Received : 2017.06.01
  • Accepted : 2017.06.28
  • Published : 2017.09.30


Sclerotium rolfsii causing southern blight on numerous vegetable and fruit crops was isolated from stems of chili peppers showing wilting symptoms. The pathogen was identified by morphological observation and DNA sequencing analysis of ITS region. To select an effective fungicide for control of southern blight, we investigated the inhibition efficacy of thirty fungicides included in nine groups of fungicides with different mechanisms of action. A fungal growth inhibition assay was conducted through an agar dilution method by using mycelial discs and sclerotia of the pathogen as inoculum, respectively. When mycelial discs were used as an inoculum, several fungicides showed good inhibitory activity against the mycelial growth of S. rolfsii 12-6. All DMI fungicides tested had a good inhibition except for prochloraz which had low inhibitory effect. All strobilurin fungicides tested except for kresoxim-methyl and all SDHI fungicides tested except for boscalid and fluopyram, had a good inhibition. Also, fludioxonil, a protective fungicide and fluazinam had a good inhibitory effect. Interestingly, when sclerotia were used as an inoculum, inhibition efficacy was increased for fluopyram, a SDHI fungicide, and for some protective fungicides such as propineb, chlorothalonil, dithianon, and folpet. All the fungicides selected in this study should be tested in the field for their control activities against stem rot for practical use in chili pepper cultivation.


Grant : 지역 맞춤형 노지 고추의 주요 병해 종합적 방제 체계 구축

Supported by : 농촌진흥청


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