The Controlling Activity of Several Fungicides against Rice Bakanae Disease Caused by Fusarium fujikuroi in Five Assay Methods

몇 가지 살균제의 벼 키다리병과 병원균에 대한 효과 검정

  • Shin, Myeong-Uk (Laboratory of Plant Fungal Pathogen, College of Agriculture, Life Science and Environment, Chungbuk National University) ;
  • Lee, Su-Min (Laboratory of Plant Fungal Pathogen, College of Agriculture, Life Science and Environment, Chungbuk National University) ;
  • Lee, Yong-Hwan (Plant Pathology Division, Department of Agricultural Biology, National Institute of Agricultural Science and Technology, RDA) ;
  • Kang, Hyo-Jung (Chungbuk Agricultural Research and Extension Services) ;
  • Kim, Heung-Tae (Laboratory of Plant Fungal Pathogen, College of Agriculture, Life Science and Environment, Chungbuk National University)
  • 신명욱 (충북대학교 농업생명환경대학 응용생명환경학부 식물의학) ;
  • 이수민 (충북대학교 농업생명환경대학 응용생명환경학부 식물의학) ;
  • 이용환 (농업과학기술원 농업생물부) ;
  • 강효중 (충북농업기술원 시험연구부 농업환경과) ;
  • 김흥태 (충북대학교 농업생명환경대학 응용생명환경학부 식물의학)
  • Published : 2008.06.30

Abstract

Recently damage of rice bakanae disease disseminated by infected seeds increased in paddy field in Korea. For controlling rice bakanae disease, the efficacy of 17 fungicides was assessed by 5 kinds of bioassay, spore germination test (SGT), mycelial growth test, detection test on Komada's medium (KDT), pouch test (PT) and greenhouse test (GT). Among ergosterol biosynthesis inhibiting fungicides, prochloraz showed a high controlling activity in all the assay systems while the others showed very low activity except for $500\;{\mu}g/ml$ of hexaconazole in GT and $500\;{\mu}g/ml$ of triflumizole in KDT. Although benomyl and the mixture of benomyl and thiram showed a good activity at 100 and $500\;{\mu}g/ml$ in SGT and PT, respectively, in GT they did a middle activity. Trifloxystrobin and kresoxim-methyl included in strobilurins showed a good activity even at $20\;{\mu}g/ml$ in KDT as well as a middle activity in SGT. Also a high activity not only at $10\;{\mu}g/ml$ in SGT but also at $100\;{\mu}g/ml$ KDT was detected in thiram. The activity of fludioxonil was confirmed in SGT, KDT and PT. Based on these results, it is very important to determine a bioassay system, because the fungicidal activity against rice bakanae disease was fluctuated depending on a assay systems as well as the mechanism of fungicide.

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