Tomato (Lycopersicon esculentum Mill) is an important vegetable crop, whose cultivation is often hampered by vascular wilt caused by Fusarium oxysporum f.sp. lycopersici (Synder and Hans). Chemical control measures create imbalances in the microbial community, which may be unfavorable to the activity of the beneficial organisms and may also lead to the development of resistant strains of pathogen. Developing resistant varieties can be difficult in the absence of dominant genes and development of new races of the pathogen overcoming host resistance. Biocontrol by use of plant growth promoting rhizobacteria (PGPR) represents a potentially attractive alternative disease management approach since PGPR are known for growth promotion and disease reduction in crops ( Jetiyanon and Kloepper, 2002). However, application of a single biocontrol agent often results in inconsistent field performance as it is less likely to be active in different soil environment and agricultural ecosystems ( Raupach and Kloepper, 1998). Combined application of two or more biocontrol strains is likely to more closely mimic the natural situation and may, therefore, represent a more viable control strategy ( de Boer et al., 1999). The level and consistency of control are therefore greatly enhanced due to multiple modes of action, a more stable rhizosphere community, and effectiveness over a wider range of environmental conditions ( Larkin and Fravel, 1998).