Author(s):

CH Varaprasada Rao and P Anil Kumar

Abstract: Temperature, pH, carbon and nitrogen sources were tested against mycelia growth and sporulation of Pyricularia grisea causing blast diseases of rice. Among different temperatures ranges tested maximum mycelial growth and sporulation was observed at 25⁰C (67.20 mm) with sporulation of 4.5x10⁶ conidia/ml after 144 hrs of incubation. Out of five pH levels, maximum mycelial growth (39.50 mm) and sporulation (4.9x10⁶ conidia/ml) observed at 7 pH. Among five carbon sources tested maltose supported good growth (32.25 mm) followed by dextrose (26.20 mm) after 144 hr of incubation. Among five nitrogen sources tested barium nitrate supported good growth (61.20 mm) followed by Ammonium nitrate(45.80 mm). None of carbon and nitrogen sources induced the sporulation of Pyricularia grisea.

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