The incidence is evaluated in the field by artificial inoculation of Xanthomonas oryzae bacteria suspension at 1 x 108 CFU/ml during booting stage (50-55 DAS) using clipping technique (Kauffman et al., 1973). Disease reaction was assessed based on percentage of leaf area diseased using a 0-9 scale as described by IRRI (2014; Standard Evaluation System for Rice, Fifth Edition).