Cultural, Nutritional Studies of Alternaria alternata (Fr.) Keissler Caused Leaf Blight of Chrysanthemum

Cultural studies of the pathogen revealed that the growth of the fungus (mean colony diameter) was maximum in potato dextrose agar (81.60 mm), followed by Richard's agar (78.50 mm). Nutritional requirement of the pathogen were studied with different carbon and nitrogen sources. Results indicated that among the five carbon compounds, mean dry mycelial weight of the pathogen was maximum when supplemented with glucose (359.67 mg), followed by sucrose (276.62 mg). Among the five different nitrogen sources, maximum mean dry mycelial weight was observed in Asparagine (383.33 mg).