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Fungicide Resistance of Fusarium fujikuroi Isolates Isolated In Korea  

Lee, Yong-Hwan (Agricultural microbiology Team, National Academy of Agricultural Science, RDA)
Kim, So-Yeon (Agricultural microbiology Team, National Academy of Agricultural Science, RDA)
Choi, Hyo-Won (Agricultural microbiology Team, National Academy of Agricultural Science, RDA)
Lee, Myeong-Ji (Agricultural microbiology Team, National Academy of Agricultural Science, RDA)
Ra, Dong-Soo (Department of agro-food safety, National Academy of Agricultural Science, RDA)
Kim, In-Seon (Department of applied bioscience and biotechnology, Jeonnam National University)
Park, Jin-Woo (Agricultural microbiology Team, National Academy of Agricultural Science, RDA)
Lee, Se-Weon (Agricultural microbiology Team, National Academy of Agricultural Science, RDA)
Publication Information
The Korean Journal of Pesticide Science / v.14, no.4, 2010 , pp. 427-432 More about this Journal
Abstract
Rice bakanae disease caused by Fusarium fujikuroi is one of the most serious rice diseases in Korea. From 2006 to 2009, 118 F. fujikuroi isolates were collected from various regions of rice fields in Korea. Resistance assay of 118 F. fujikuroi isolates to prochloraz, tebuconazole, and benomyl, were performed using agar dilution method. To investigate inhibitory effects of the fungicides, minimum inhibitory concentration of mycelial growth (MIC) and effective concentration inhibiting mycelial growth by 50% ($EC_{50}$) for 118 isolates were calculated using Sigmaplot 8.02 (Antro, SPSS UK, Ltd). Based on the means of $EC_{50}$ values, baseline resistance values were determined as $0.5{\mu}g{\cdot}mL^{-1}$ for prochloraz, $5.0{\mu}g{\cdot}mL^{-1}$ for tebuconazole and $2.5{\mu}g{\cdot}mL^{-1}$ for benomyl. Number of resistant isolates to each fungicide was 17, 19 and 43 for prochloraz, tebuconazole and benomyl, respectively. Furthermore, 4 isolates showed the double resistance to both prochloraz and tebuconazole, 6 isolates to prochloraz and benomyl, and 11 isolates to tebuconazole and benomyl. Isolates CF366 and LF335 isolated from Gyeongbuk province were resistant to the three fungicides tested, prochloraz, tebuconazole and benomyl.
Keywords
Fusarium fujikuroi; Fungicides resistance; Cross resistance;
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