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Background Emerged faba bean gall disease attacks the stem and leaves of the plant and results in complete crop losses. This study was initiated to screen multi-trait rhizobacteria for their antagonistic efficacy under in-vitro and in-vivo conditions against  Olpidium viciae  to control the effect of gall disease on faba bean. Sixty antagonistic isolates were first examined for their morphological, biochemical, and phenotypic traits. Results Pseudomonas fluorescens  AAUPF62,  P. aeruginosa  AAUS31,  Bacillus  AAUMF42, and  Bacillus  AAUAm28 showed greater than 68, 62, 57, and 54% suppression of  O. viciae  in dual culture, volatile metabolites, culture filtrate assay, and detached leaves experiments, respectively. The in-vivo study revealed that early treatment of the crop with  P. aeruginosa  AAUS31 reduced severity by 63% (in FB-Obse) and 54% (in FB-26869) faba bean varieties. The co-inoculation of  P. fluorescens  AAUPF62 and  P. aeruginosa  AAUS31 significantly enhanced the shoot ( P  = 0.003; mean = 122 cm) and root ( P  = 0.018; mean = 94 cm) length, increased shoot dry weight by 8 factors (83 g pot  −1 ), and reduced final disease severity by 92% in FB-Obse variety. Conclusions The results revealed that  P. fluorescens  AAUPF62 and  P. aeruginosa  AAUS31 strains could be the potential antagonistic agents of gall disease. The use and early treatment of moderately resistant faba bean varieties by co-inoculation of synergistic potential bioagents were recommended.

Screening of indigenous rhizobacteria as potential biological control against faba bean (Vicia faba L.) gall disease caused by Olpidium viciae