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Meloidogyne incognita  is one of the most destructive soil pests, causing serious economic losses in tomato production. Here,  in vitro  experiments demonstrated that the  Bacillus licheniformis  strain JF-22 has the potential to prevent  M. incognita  infection. A pot experiment confirmed that  B. licheniformis  strain JF-22 isolated from the tomato rhizosphere soil and planted in the tomato root-knot nematode disease area effectively prevented and controlled  M. incognita , reducing its negative effect on tomato growth. Additionally, the composition of volatile substances secreted by  B. licheniformis  strain JF-22 was analyzed using solid-phase microextraction and gas chromatography–mass spectrometry. We detected acetoin, 2,3-Butanediol, [R-(R*,R*) ]-, and hexamethyl cyclotrisiloxane as the main components among these volatiles. Using MiSeq sequencing technology and bioinformatics, we analyzed the influence of  B. licheniformis  strain JF-22 on the microbial community of the tomato rhizosphere.  B. licheniformis  strain JF-22 changed the composition of the microbial community; particularly, it significantly reduced the diversity of the fungal community. Furthermore, using the FUNGuild and PICRUSt databases, we predicted the effect of JF-22 on microbial community function. In conclusion,  B. licheniformis  strain JF-22 may be considered as a potential biocontrol agent against  M. incognita .

Bacillus licheniformis JF-22 to Control Meloidogyne incognita and Its Effect on Tomato Rhizosphere Microbial Community