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The resistant level of the houseflies to the several kinds of insecticides, pyrethrins, allethrin, Sumithion (fenitrothion), diazinon, DDVP, Baytex, γ-BHC and DDT, were examined on the sixteen strains collected in Indonesia. It was found that many housefly colonies in Indonesia showed higher susceptibility to these insecticides than the Takatsuki strain, especially the flies collected in Ambon, Celebes, Flores, Bali, Timor and Lombok Islands were found to be high susceptible for 9 insecticides. A few samples of flies from Indonesia showed tolerant to Sumithion, especially high LD50 values were obtained in the flies from 3 places of Jakarta city (0.615, 0.560 and 0.407 μg, respectively) and from Kabanjahe, Sumatra (0.435 μg). These LD50 values were much higher than the value of Takatsuki strain (0.088 μg).

THE RESISTANT LEVEL OF THE HOUSEFLIES TO SEVERAL SYNTHETIC INSECTICIDES IN INDONESIA