Biological control of bacterial blight of rice using native isolates of Trichoderma and Bacillus in rice cultivar Telangana Sona (RNR 15048)

Abstract

Intensified rice cultivation has brought in increased incidences of diseases leading to more usage of chemicals for their management. However, awareness about the hazards of chemicals in the environment and food residues, demands alternative strategies including biological management of plant diseases. The present study explores the use of native bioagents against bacteria blight of rice caused by Xanthomonas oryzae pv. oryzae (Xoo) in the popular variety Telangana Sona (RNR-15048). Variety Taichung Native 1(TN1), was used as a susceptible check. Results indicated that in Telangana Sona, Trichoderma asperellum isolate, TAIK1 was 17.20% and Bacillus subtilis isolate, BIK3 was 4.5% more effective to control lesion length development than Trichoderma atroviride 1D and Bacillus subtilis 1D respectively. Percent increase in root and shoot length of Telangana Sona due to TAIK1 was 12.53% and 2.32% respectively more than T. atroviride 1D. In case of Bacillus treatment, percent increase in root and shoot length due to BIK3 was 2.34% and 8.4% respectively more than B. subtilis 1D. Similar trend of bioagents effectivity was observed in TN1, however was found to be less resistant than Telangana Sona.