The field efficiency of three rodenticide baits were evaluated.They were Zinc phosphide 1.5% , Coumatetralyl 0.0375% and Brodifacoum 0.005%. Filed trials were carried out in wheat fileds at Etay El-Baroud Research Station El-Behera Governorate infested with wild Rattus rattus.  The population reduction because of using Coumatetralyl only bait was 63.33% while the efficiency of Brodifacoum bait was 67.66 %. The efficiency of Zinc phosphide bait 1.5%, (crushed maize 98.5%) was only 44.47 %.  The efficiency  of Zinc phosphide bait 1.5%  ,sunflower seeds  96.5%, corn oil 2% and Zinc phosphide bait  1%,sunflower 98% ,corn oil 1%  were 57.27% and  34.6% , respectively.