Vol. 11, Issue 7 (2022)

Author(s):
Prajna Samal, Bireswar Sinha, L Nongdren Khomba Singh, PH Sobita Devi, Shravan M Haldhar, N Gopi Mohan Singh, Kota Chakrapani and Soumen Pati

Abstract:
Rice (Oryza sativa L.) is one of the primordial cultivated crops whose productivity is affected by several pathogens, among which, sheath blight, is responsible for yield loss of up to 45%. The pathogen associated with sheath blight (ShB) is Rhizoctonia solani Kuhn. pH, temperature, and sugar concentration play an important role among different factors affecting fungi growth and spread. The purpose of the research was to study the effect of pH, temperature, and sugar concentration on the growth of R. solani isolates of rice based on the radial mycelial growth on potato dextrose agar. However, in vitro, the maximum mycelial growth of the majority of isolates was observed in pH 5 and 7, with temperatures 30 °C and 34 °C, and with higher sugar concentrations. Optimum growth was found at 5 pH, 30 °C temperature, and 20 g/L sugar.