Resistance of bipolaris-oryzae to fenapanil

M. K. Kardin, J. A. Percich

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Fenapanil-resistant strains of B. oryzae [isolated from wild rice, Zizania aquatica] were obtained by successive transfers on a series of fenapanil-amended potato-dextrose agar media containing increasing concentrations of the fungicide or by selection from a conidial suspension on a medium containing 100 .mu.g/ml of fenapanil. The ability of the fungus to acquire resistance to fenapanil was accompanied by a reduction in its fitness for survival and virulence. Generally, strains with a greater degree of fenapanil resistance grew slower and produced fewer conidia than strains with less resistance to fenapanil. Most of the fenapanil-resistant strains of B. oryzae declined in their resistance to fenapanil after 1 passage on a fungicide-free medium. Both fenapanil-resistant and -sensitive strains were effectively controlled on fenapanil-treated plants in the greenhouse; however, the fenapanil-sensitive strain was more virulent on untreated plants.
Original languageEnglish (US)
Pages (from-to)871-874
Number of pages4
JournalPlant Disease
Issue number8
StatePublished - 1983


  • Development
  • Reproduction
  • Agronomy (Agriculture)
  • Infection
  • Pest Assessment Control and Management

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