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

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)
Publication Information
The Korean Journal of Pesticide Science / v.12, no.2, 2008 , pp. 168-176 More about this Journal
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.
Keywords
rice bakanae disease; fungicidal activity; prochloraz;
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