TITLE:
Comparative study of the effect of Bacillus thuringiensis on larval populations of Culex pipiens L. (Diptera-Culicidae) of the City of Tlemcen (Algeria)
AUTHORS:
Nassima Tabti, Karima Abdellaoui-Hassaïne
KEYWORDS:
Tlemcen; Culex Pipiens; Bacillus Thuringiensis Israelensis; Nuisance; Bio Insecticide
JOURNAL NAME:
Open Journal of Ecology,
Vol.3 No.3,
July
18,
2013
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.