The full grown larvae and pupae of 3-days oldof both Bactrocera zonata and Ceratitis capitata were sandy-soil-treated under laboratory conditions with five different insecticides to determine their comparative toxicity. The toxicity of the used compounds differently varied against the 3^rd larval instar of B. zonata, where Marisol 1.8% EC (abamectin) surpassed the other tested compounds at LC₅₀ (5.343 µl/L), while Opal 5%EC (lufenuron) was the most effective insecticide against the 3^rd larval instar of C. capitata showing the lowest value of LC₅₀ of 11.299 µl/L. Respecting to the three-day old pupae of the two tested species, Marisol 1.8%EC was the most potent compound at LC₅₀ (395.461 µl/L for B. zonata and 151.373 µl/L for C. capitate). The full grown larvae of B. zonata were the most susceptible to Heater 3%SC (lufenuron+emamectin benzoate) and Marisol 1.8%EC at both LC₅₀ and LC₉₀, where those of C. capitata showed tolerance level to the two insecticides by 7.78, 14.16 and 6.02, 8.47 fold at LC₅₀ and LC₉₀, respectively. But, pupae of B. zonata more tolerable than that of C. capitate to Glory 5%EC (lufenuron), Marisol 1.8%EC and Cymax 5%EC (lufenuron) at LC₅₀ and LC₉₀ by 5.54, 2.61, 1.87 and 8.29, 2.32, 3.28 fold, respectively.