B. subtilis FZB24 and FZB37 inhibited mycelial growth of F. oxysporum, R. solani and Sclerotinia Sclerotiosum in vitro. Incidence of F. oxysporum disease was significantly reduced by up to 50% while plant height, root and shoot fresh weight increased significantly compared to the control. The result of the greenhouse was quite different from the result in vivo which means that antifungal activities in vitro did not always correlate with disease reduction in vivo (Schmledeknecht et al. 2001). This is quite similar to the result from this research. Bacteria that antagonise soil-borne pathogen in vitro are not necessary the most effective in vivo and viceversa (Chérif et al. 2002). Bacillus spp from the rhizosphere have been reported to be effective against a variety of soil borne pathogens. They are able to do this using diverse mechanisms (Choudhary and Johri 2009; Kloepper et al. 2004). Colonization of root was not inspected in this research but from the morphology of the root samples, those treated with Bacillus isolates had more root hairs compared to the uninoculated control.