Comparison of the Antagonistic Potential of the Entomopathogenic Bacterium Serratia nematodiphila GCSR38 with other Effective Microorganisms for the Control of Rice Bacterial Leaf Blight

The efficacy of antagonistic microorganisms and secondary metabolites entomopathogenic bacteria was evaluated in vitro vivo against Xanthomonas oryzae pv. (Xoo), a causal agent rice bacterial leaf blight. effect the culture filtrates tested Xoo, using agar well diffusion assay. Trichoderma sp. UB05/3 most effective Xoo. However, results were not statistically different from those bacterium Serratia nematodiphila GCSR38 with 22.97 mm 19.15 zone inhibition, respectively. metabolite crude extracts (2,000 µg/ml) on Xoo inhibition by paper disc method. Only S. able to control an 17.60 mm. Minimum inhibitory concentration (MIC) determined 96-well microtiter plate. MIC 1,000 µg/ml minimum bactericidal (MBC) µg/ml. extract detached technique; controlled disease, 24.45% 15.56% disease severity when used before after inoculation Inoculation alone resulted 44.45%. can reduce blight 28.89%, whereas zinc thiazole causes 22.22% 66.67%.