Antagonistic activity of endophytic bacteria isolated from weed plant against stem end rot pathogen of pitaya in Vietnam

Abstract Background Fungal stem end rot disease of pitaya caused by Alternaria alternata is one the most destructive diseases in Binh Thuan province, Vietnam. This study aimed to assess antagonistic effects some endophytic bacteria isolated from weed plant ( Echinochloa colonum ) against A. . Results A total 19 were and 5 them presented vitro activity alternata. Of five, strain EC80 significantly inhibited pathogenic growth with a mean inhibition diameter 11.88 ± 0.08 mm, while other four (C79, EC83, EC90, EC97) showed weak inhibition. Interestingly, combination EC79 reduced more biomass fungi than single did. positive results for amylase, indole acetic acid (IAA), biofilm production, whereas capabilities IAA production negative amylase production. In addition, combined filtrate non-antifungal on biocontrol tests vitro, indicating that cells played role defending pathogen. Moreover, both isolates increased seedling control. Conclusions The suggest those two strains had potential be used as agent More studies should done future evaluate their efficiency under field conditions.