Fig. 3

Control efficiency of B. velezensis D against tobacco bacterial wilt. a Symptoms of tobacco bacterial in different groups at 14 d after inoculation with pathogen. b Disease indexes of groups at 14 d post-R. solanacearum treatment. c Control efficiency of groups at 14 d post-R. solanacearum treatment. d Concerntration R. solanacearum DNA in rhizosphere soil of groups at 14 d post-R. solanacearum treatment. D represents B. velezensis D, Chemical represents chemical bactericide (52% chloruric copper sulfate wettable powder). Data are presented as the mean ± SD based on three biological replicates; P-values were determined by LSD post-hoc test. Different letters represent significant difference