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Background Fusarium  wilt of tomato caused by  Fusarium oxysporum  f. sp.  lycopersici  (FOL) is a serious disease that causes significant economic losses in tomato production. Seventeen endophytic  Bacillus  isolates from tomato roots of Meghalaya were tested for antagonistic and plant growth promotion activities. Dominating arbuscular mycorrhiza fungi (AMF) spores were isolated from the rhizosphere soils of tomato grown in Meghalaya. The effect of different combinations of AMF and endophytic  Bacillus  on  Fusarium  wilt severity and growth of tomato plant under pot and field conditions was studied. Results The endophytic  Bacillus  isolates ERBS51 and ERBS10 showed a maximum inhibition against FOL, with 58.43 and 55.68%, respectively, in a dual culture experiment. ERBS51 and ERBS10 were identified as  Bacillus velezensis  and  Bacillus  sp., respectively, based on 16s rRNA sequencing. Both isolates were found positive for iturin A, surfactin, bacillomycin D, protease, cellulase, pectinase, alpha-amylase, siderophore, ammonia production and ZnCO 3  solubilization.  Funneliformis mosseae  and  Glomus fasciculatum  were the dominating AMF species in tomato rhizosphere of Meghalaya. The result of pot and field experiments revealed that out of all the treatments, combination of  Funneliformis mosseae  +  Glomus fasciculatum  +  Bacillus velezensis  +  Bacillus  sp. was shown to be the best in reducing the severity of  Fusarium  wilt to 77.44 and 66.74%, respectively.  F. mosseae  +  G. fasciculatum  +  B. velezensis  +  Bacillus  sp. also recorded the highest in most growth attributes and yield. Conclusions Endophytic  Bacillus  ( B. velezensis  and  Bacillus  sp.) and AMF ( F. mosseae  and  G. fasciculatum ) were safe and effective biocontrol agents against  Fusarium  wilt of tomato.

Effect of endophytic Bacillus and arbuscular mycorrhiza fungi (AMF) against Fusarium wilt of tomato caused by Fusarium oxysporum f. sp. lycopersici