Screening Potential Microbial Biological Control Agents from Rice Seeds to Rice Sheath Blight (Rhizoctonia solani)

Two hundred and eighty-three(283) bacterial isolates were obtained from rice seeds of 13 varieties. Twenty-nine(29) isolates produced inhibitory effect against Rhizoctonia solani(10.25%), eight(8) isolates against Sarocladium oryzae(2.83%), while none produced inhibitory effect against Fusarium moniliforme. Two promising isolates (i.e.8-02 and 8-09) were screened through the experiment for the detection of antagonistic activity in vitro, suppression of bacterial suspension on sheath blight lesion in vitro, and plant growth promotion test. Both isolates were identified as Bacillus spp.