ABSTRACT
The present study was undertaken to establish a baseline susceptibility levels of the Egyptian P. papatasi to five insecticides [BHC and DDT [chlorinated hydrocarbon], permethrin [synthetic pyrethroides], malathion [organophosphorus] and propoxur [carbamate]]. The results obtained revealed that the laboratory bred P. papatasi were more susceptible to the five insecticides than the wild caught ones. The insecticidal efficiency of the five insecticides based on LC50 was in the following descending order: Propoxur, permethrin, BHC, DDT and malathion for laboratory bred flies and propoxur, permethrin, BHC, malathion then DDT for wild caught flies. The least LC50 was when using propoxur for both the wild caught flies [0.0014%] and laboratory bred ones [0.00043%]. The least LT50 was when using propoxur for both the wild caught flies [4.8 seconds] and the laboratory bred flies [2.2 seconds]