On the other side, some soil bacteria showed antifungal properties because of the production of chitinase which may
be a part of a lytic system that enables bacteria for living on hyphaeas actual growth substrate (De Boer et al., 1998). At
the same time, Barakate et al. (2002) indicated that some soil Streptomycetes were active against yeasts and some filamentous fungi. Also, the antifungal effect of some microbes may be due to the production of extracellular antifungal secondary metabolites such as iron chelators produced by some bacterial species such as pyocheline, pyoverdine and pseudopactin which inhibit or prevent the growth of pathogenic organisms (Osman, 2004). De Boer et al. (2007) indicated in vitro suppression of some plant pathogenic fungi by non-antagonistic soil bacteria. They referred the antifungal effect to the sensitivity of fungi to bacterial secondary metabolites, and to the competitive interactions between bacterial strains. At the same time, Park et al. (2008) isolated extracellular 17 KDa antimicrobial protein from Aspergillus oryza and active against pathogenic fungi and bacteria.