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In this study, the Chrome Azurol Sulphonate (CAS) agar plate assay for siderophores was used to screen bacteria from the rhizospheric soil of pepper in Hainan, China. As a result, Bacillus subtilis CAS15, which produced a large orange halo, was obtained. A dual-culture test showed that CAS15 strongly antagonized the growth of 15 plant fungal pathogens, with rates of inhibition ranging from 19.26 to...