In the cities of Algeria, Culex pipiens L. (Diptera: Culicidae) is the mosquito which presents most interest because of its wide geographical distribution and of its abundance which engender a strong nuisance. Besides, its role of vector of the virus West Nile arouses a particular interest in the Mediterranean Basin. These insects are generally controlled by conventional insecticides for the greater part, chemicals which cause in the long term side effects (effects on the not aimed bodies and the resistance of the aimed species). A research for the effect of the bioinsecticide Bacillus thuringiensis (granulated commercial shape in 200 IUT 1 /mg) was realized on préimaginales populations of the artificial deposits sites (taken directly of them natural the deposits sites) and cleansed populations (stemming from a breeding) having never been handled previously, taking into account local weather and physico-chemical conditions. Analyses of variance, allowed to determine the combined effect of the factor measure and of the factor time which by increasing, increase the efficiency of the product. The results of the rates of mortalities registered after treatment allowed to loosen the DL50 and the DL90 for every embryonic stage. From the results, we estimated the degree of sensibility of the larva populations of Culex pipiens which have proved heterogeneous in partial tolerance in Bacillus thuringiensis for the populations of the sensitive artificial and homogeneous the deposits sites for those stemming from the breeding.
The nuisance situation, generated by Culex pipiens, is strongly felt in Tlemcen. The difficult-to-control extension of urban planning and the faulty sewage and sanitation system are generators of cottages in Culex pipiens. To define areas infested with Culex pipiens, survey methods are an indispensable tool to address certain territorial problems (Metelo et al., 2013). Thus carrying out a survey of households in three municipalities located in the wilaya of Tlemcen in Algeria (Tlemcen, Chetouane and Mansourah). The purpose of the survey was to assess the degree of nuisance caused by Culex pipiens on populations. The results of the survey conducted in the Large Tlemcen grouping helped to define the aggressiveness of Culex pipiens and thus to establish a mapping of the infested areas.
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