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Studies on the morphology, physiology and pathogenicity of Cercospora oryzae Miyake, the causal fungus of narrow brown spot of rice plant



Studies on the morphology, physiology and pathogenicity of Cercospora oryzae Miyake, the causal fungus of narrow brown spot of rice plant



Bull Natl Inst Agric Sci [japan] Ser C Plant Pathol 6: 167-178



This disease, very common in Japan, develops mostly after September. Conidfa are cylindrical to tapering, 25-34 x 4-5 [mu], hyaline or light olive in color. Growth occurs from 6-33[degree]C with the optimum between 25-28[degree]C and between pH values of 2.8 to over 9.3, with 5.7-7.1 the optimum in liquid media. Conidia are killed by hot water at 45[degree]C in 40 min. and at 48[degree]C in 10 min., and by dry air at 80[degree]C within 60 min., 85CC within 30 min. and 90[degree]C within 10 min. The older leaves are more susceptible to infection than are the younger.

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