Research in Plant Disease 2006;12(1):5-9.
Published online April 30, 2006.
벼 이삭마름병 발병시기와 정도가 수량 및 품질에 미치는 영향
심홍식, 홍성준, 홍성기, 김용기, 예완해, 성재모
Effects of Development Time and Severity of Rice Ear Blight on Rice Yield and Quality
Hong Sik Shim, Sung Jun Hong, Sung Gi Hong, Yong Ki Kim, Wan Hae Ye, Jae Mo Sung
Grain discoloration, caused by several microorganisms, is a minor disease, but it is gaining importance in almost all rice growing areas of the world in recent years. Such grains are of low market value and consumption appeal in addition to their abnormal performance as seed of source of nutrient value. When the casual agents were inoculated on rice plant, ``Ilmi-byeo`` (at right before heading time and on heading time), the incidence of rice ear blight caused by Alternaria alternata and Nigrospora oryzae was higher in a plot inoculated at right before heading time than (in a plot inoculated) on heading time. Meanwhile, the incidence of rice ear blight caused by Bipolaris oryzae and Curvularia lunata was higher in a plot inoculated on heading time than in a plot inoculated at right before heading time. In rice quality, the ratio of imperfect grains was increased at right before heading time or on heading time by Nigrospora oryzae or Alternaria alternata, respectively. As discoloration rate of rice grains increased on ``Ilmi-byeo``, the percentage of perfect grains decreased proportionally and the percentage of damaged rice grains increased remarkably.
Key Words: Rice ear blight, Rice quality, Yield Loss

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