Effect of different media, pH and temperature on the radial growth and sporulation of Alternaria alternata f.sp. lycopersici

Alternaria alternata f.sp lycopersici was grown on nine different solid media to observe the radial growth of the test fungus. P.D.A. medium favored the maxi mum growth and lowest growth was recorded on standard nutrient agar medium. While poor sporulation was recorded on the host extract agar medium. The temperature requirement of the pathogen was investigated on P.D.A. medium in the range of 10 to 35°C . The fungus exhibited maximum growth at a wide range of pH from 5.0 to 8.5 and the best fungal growth was recorded at pH 7.0 and poor growth was observed at pH 5.0.