The Role ofBipolaris oryzaein Floral Abortion and Kernel Discoloration in Rice

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Abstract
Foliar symptoms of brown spot (caused by B. oryzae) were modified in field plots by the presence of a rice line that promotes spreading of the disease and by the use of fungicides. There was no correlation between brown spot symptoms and floral abortion, and kernel discoloration was moderately correlated with brown spot. In this study, panicle blight, a disease of unknown etiology, was the primary cause of floral abortion and rice stink bug feeding was the major factor in kernel discoloration. B. oryzae was a secondary invader of aborted florets; it was possibly the primary cause of some kernel discoloration, and was just one of many microbes that colonized kernels through stink bug feeding wounds.