Abstract
This study is aimed at evaluating effects of carrier materials on survival and biological activities of Bacillus aerophilus against Xanthomonasoryzae pv. oryzae (Xoo) causing rice bacterial leaf blight. Five carrier materials, i.e., talc, rice bran, rice kernel powder, rice grain powder and rice husk powder were used to prepare different B. aerophilus formulations at an initial cell concentration of 2×108 CFU/mL. Talc, rice bran and rice husk formulations maintained the number of viable B. aerophilus cells higher than 106 CFU per gram formulation as well as its antagonistic effects against Xoo after six months of storage. Under greenhouse conditions where rice plants were inoculated at 45 days after sowing, seed soaked with these three formulations after six months of storage effectively reduced lesion lengths until 15 days after inoculation compared to the untreated control. Thus, talc, rice bran and rice husk powder show their potentials for production of bio-products to control bacterial leaf blight in rice fields.
Published Version
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