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In this study Three dosage rates of Ficam 80% were tested: 112,168 and 224 mg/m2 for its residual efficacy using a laboratory bred colony of An. arabiensis. Percentages of knocked-down after 60 min. exposure, and mortality after 24 hours were recorded. 6025 mosquitoes specimens were involved in bioassay test ,Regardless of surface type or month, the dosage rates 112,168and 224 mg of Ficam had shown average mortality rates of 46 %, 47 % and 65% respectively. Accordingly, among all tested dosages, strongest one is 224 showing a powerful impact residual effect, while dosage rate 112 and 168 revealed weak positive relationships. However, using the probit analysis, LD50% was calculated on the thatch, mud and brick surfaces equaling 212.6, 174.7, and 172.6, respectively. On the same hand, LD95% was calculated on the above surfaces to be 713.4, 644.6 and, 946.5, respectively.