Larval susceptibility of Culex pipiens L. Diptera: Culicidae, collected from different localities at Sharkia Governorate to some insecticides
2011
El-Sheikh, E.A.
The susceptibility of Culex pipiens larvae from different localities at Sharkia Governorate to malathion and lambda-cyhalothrin was studied. The activities of acetylcholinesterase, esterases and glutathione-S-transferase in the tested insect were determined. Bioassay tests indicated that different levels of resistance were found in Cx pipiens against the tested insecticides based on the localities of sampling. For the populations tested with malathion, the resistance ratio ranged from 1-99-fold when compared with the laboratory susceptible strain (SS), while in the populations treated with lambdacyhalothrint, the resistance ratio ranged between 5-1900-fold. In all cases, the population collected from Diarb Negm (PD) exhibited a high level of resistance to the tested insecticides than the other populations. Activity of acetylcholinesterase in all tested populations a significantly less than that of the SS. On the other hand, both ,esterases and GST activities were significantly higher in the collected populations as compared with SS. These data concerning the different levels of resistance of the collected populations may be due to different practices of insecticides use either indoor or outdoor against the common pests. This indicates the importance of the adoption IPM programs for such insect under local conditions.
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