Synergistic Interaction of Fungicides in Mixtures under Different Conditions of Dollar Spot Disease Caused by Sclerotinia homoeocarpa

잔디 동전마름병의 발생정도가 다른 골프장 그린 조건에서 살균제 혼용살포에 의한 상승적 방제 효과

  • Chang, Seog-Won (Department of Golf Course Management, Korea Golf University) ;
  • Jung, Suk-Woo (Department of Golf Course Management, Korea Golf University) ;
  • Kim, Se-Hun (Department of Golf Course Management, Korea Golf University) ;
  • Park, Jong-Hyun (Department of Golf Course Management, Korea Golf University) ;
  • Lee, Ji-Young (Division of Golf Course Management, Park Vally Golf Course)
  • 장석원 (한국골프대학 골프코스매니지먼트과) ;
  • 정석우 (한국골프대학 골프코스매니지먼트과) ;
  • 김세훈 (한국골프대학 골프코스매니지먼트과) ;
  • 박종현 (한국골프대학 골프코스매니지먼트과) ;
  • 이지영 (파크밸리 골프클럽 코스관리부)
  • Received : 2012.05.25
  • Accepted : 2012.06.25
  • Published : 2012.08.31

Abstract

Dollar spot caused by Sclerotinia homoeocarpa F.T. Benn. is a common and economically important turfgrass disease in South Korea. Fungicides were evaluated for control of dollar spot in creeping bentgrass golf course putting green. Commercial formulations of propiconazole, thiophanate-methyl, chlorothalonil, trifloxystrobin and boscalid were applied to plots of creeping bentgrass, each of the latter four fungicides was tank mixed with propiconazole at the same rates, and applied as treatments. The dollar spot severity in the nontreated plots of field A and B progressed toward peak diseases of 18.3 and 66.7% from 10 or 15 days after inoculation, respectively. Significant differences were detected among control values of the fungicides. Dollar spot control provided by boscalid was significantly greater than the other fungicides which showed low control values in a higher disease condition. No synergistic interactions, except propiconazole + thiophanate-methyl treated plot, were detected under a lower disease pressure. However, under a higher disease pressure, synergism was observed at all fungicide combinations, except a propiconazole and boscalid tank mixture. These data suggest turfgrass managers in golf course can take advantage of fungicide synergism to control dollar spot using the products and rates in this study.

Acknowledgement

Supported by : National Research Foundation of Korea

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