Aims: To determine the effects of concentrations of fusaric acid on the growth of several strains of the biocontrol bacterial endophyte Bacillus mojavensis and other species within the Bacillus subtilis group, as well as the genetic relationships within this small group of Gram-positive bacteria, and their antagonisms to Fusarium verticillioides, which produce fusaric acid. Methods and Results: The growth of 50 Bacillus strains and species were tested at two concentrations of fusaric acid determined in maize infected by an isolate of F. verticillioides. Molecular characterizations of the strains and species of bacteria were determined with an automated ribotyper. The growth of bacteria measured under both concentrations with an automated turbidometer, Bioscreen, indicated that fusaric acid was toxic to most strains of the bacterial endophyte B. mojavensis. However, the effects of these two concentrations on other Bacillus species varied in that fusaric acid was either bacteriocidal or bacteriostatic to most species. Conclusions: These data indicate that the concentrations of fusaric acid are inhibitory to the growth of most Bacillus species, some of which are used as biocontrol agents. This suggests that the endophytic and saprophytic states of F. verticillioides and other Fusarium species cannot be controlled by fusaric-acid-sensitive Bacillus species. Significance and Impact of the Study: Mycotoxic Fusarium species, such as F. verticillioides, are competitive because all produce fusaric acid, which is inhibitory to biocontrol bacteria, and mutants tolerant to fusaric acid must be developed in order to be effective on biocontrol bacteria.