Abstract
Culex pipiens pipiens is an important vector of human diseases. To determine the insecticide resistance development in Culex pipiens pipiens against selection pressure of temephos.. A field population of Culex pipiens pipiens was collected from Northwestern Tunisia with a medium level of temephos resistance (LC50 = 0.0069). It was subjected to six generations of temephos pressure selection to evaluate its relationship to cross-resistance towards organophosphates (OPs) and pyrethroids (PYR) insecticides. The selection was initiated at the dose 0.0266, 0.0748 and 0.0069 which were increased during successive generations up to 0.1488, 3.8747 and 0.0086 after sixth generation for temephos, chlorpyrifos and permethrin insecticides, respectively. It is important to noted that high cross-resistance to chlorpyrifos insecticide (OP) was detected (51.88×). However, little or no cross-resistance to the pyrethroid permethrin (PYR) was recorded (1.24×). Contrary to metabolic resistance, it seemed that acetylcholinesterases AChE 1 was fixed under pressure selection. The high cross-resistance to temephos and chlorpyrifos is reasonable because they belong to the same class of insecticide (OP). However, the little cross-resistance to the pyrethroid permethrin could support its use alternately for Culex pipiens pipiens control.
Highlights
Most frequently found in tropical and sub-tropical areas of the world, Culex pipiens historically causes nuisance and are important vectors of humans diseases[1]
The selection was initiated at the dose 0.0266, 0.0748 and 0.0069 which were increased during successive generations up to 0.1488, 3.8747 and 0.0086 after sixth generation for temephos, chlorpyrifos and permethrin insecticides, respectively
The selection was initiated at the dose 0.0266, 0.0748 and 0.0069 which were increased during successive generations up to 0.1488, 3.8747 and 0.0086 in sixth generation for temephos, chlorpyrifos and permethrin insecticides, respectively (Tables 1, 2, 3)
Summary
Most frequently found in tropical and sub-tropical areas of the world, Culex pipiens historically causes nuisance and are important vectors of humans diseases[1]. The objective of the present study was to determine the resistance development and insecticide susceptibility in Culex pipiens pipiens against selection pressure of temephos and its relationship to cross-resistance towards organophosphates and pyrethroids insecticides. Such knowledge is essential in defining future control strategies against this medically important mosquito. It was subjected to six generations of temephos pressure selection to evaluate its relationship to cross-resistance towards organophosphates (OPs) and pyrethroids (PYR) insecticides. Resistance development and insecticide susceptibility in Culex pipiens pipiens, an important vector of human diseases, against selection pressure of temephos and its relationship to cross-resistance towards organophosphates and pyrethroids insecticides.
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