DOI: 10.36347/sajb.2020.v08i08.002

Pages: 238-243

In the Sahelian zone, Bruchidius atrolineatus (Coleoptera-Bruchidae) is one of the major pests of cowpea seeds (Vigna unguiculata (L.) Walp). The objective is to study the biological parameters of this insect in the Sahelo-Sudanian zone of Niger. The objective is to study the biological parameters of this insect in the Sahelo-Sudanian zone of Niger. To make strains from this area were collected and the biological parameters of B. atrolineatus were studied according to the generations. Analysis of our results shows that second generation insects live longer than first generation insects. The results obtained on fertility show that the latter is low whatever the generation considered, but also with a very low larval survival rate and an emergence rate. Analysis of our results shows that second generation insects live longer than first generation insects. The results obtained on fertility show that the latter is low whatever the generation considered, but also with a very low larval survival rate and an emergence rate. The evolution of mortality shows that it is much more spread out in time for the second generation than for that of the first generation. Taking gender into account, our results show that females die faster than males, regardless of generation. The evolution of fertility shows that most of the eggs are laid during the first four to five days of the infestation, whatever the generation. These data are essential for mastering the bioecology of B. atrolineatus in order to propose effective control methods.