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Comparative study of the effect of Bacillus thuringiensis on larval populations of Culex pipiens L. (Diptera-Culicidae) of the City of Tlemcen (Algeria)

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DOI: 10.4236/oje.2013.33030    2,650 Downloads   4,587 Views   Citations

ABSTRACT

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 IUT1/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.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Tabti, N. and Abdellaoui-Hassaïne, K. (2013) Comparative study of the effect of Bacillus thuringiensis on larval populations of Culex pipiens L. (Diptera-Culicidae) of the City of Tlemcen (Algeria). Open Journal of Ecology, 3, 265-271. doi: 10.4236/oje.2013.33030.

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