Abstract

Knowledge of the genetic distribution of Sitophilus zeamais, the main pest of maize stocks in West Africa, is a prerequisite for securing conserved maize crops. So far, most of the studies carried out to find a solution to the huge losses have been to identify bioinsecticides of vegetarian origin. This article aims to highlight a possible genetic structure of S. zeamais according to 5 countries of the semi-arid zone [23], to identify the types of demographic and phylogenetic evolution of the populations of the insect in these countries. This study will then make it possible to know the populations of the countries most prone to survival or extinction, through the evaluation of their genetic diversity and the identification of the type of selection that specifies them. To reach this objective, 60 insects were harvested in the countries. Exploitation of the Cytochrome B gene sequences corresponding to these individuals by population genetic study software (Bioedit, DNAsp, Mega, Harlequin, etc.) revealed a genetic structure of S. zeamais according to the 5 countries in the area, a close relationship between the populations of the insect which would be originating in Niger and at the end of the models of demographic evolution which are not confirmed however by the demogenetic tests.