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Some strains of Pseudomonas fluorescens act as biocontrol by competing for nutrients and root surface colonization aggressively. Pseudomonas sp. RU47 colonizes the rhizosphere with sufficient density and compete with Rhizoctonia solani and minimizes the severity of black potato scurf and lettuce bottom rot in diluvial sand, alluvial loam, and loess loam soils [15]. The competition can also be for micro-nutrients, specifically iron, associated with high-affinity chelators called siderophores secreted by microorganisms. An experiment with transgenic tobacco overexpressing ferritin showed that fluorescent Pseudomonads could survive in a less iron-containing environment and have an antagonistic activity to the pathogen [16].