TITLE:
The Impact of Agro-Ecological Variation on Biological Parameters of Bruchidius atrolineatus Pic (Coleoptera-Chrysomelidae-Bruchinae)
AUTHORS:
Dan Mairo Adamou Moumouni, Ali Doumma, Amadou Harouna Issa
KEYWORDS:
Cowpea, Bruchids, Agro-Ecological, Biological Parameters, Niger
JOURNAL NAME:
Open Access Library Journal,
Vol.2 No.12,
December
8,
2015
ABSTRACT:
In this study, the biological parameters of two B. atrolineatus strains
originated from two different agro-ecological areas of Niger are examined. The
analysis of the adult lifetime showed that B. atrolineatus strain of the
Sahelo-Sudanese area lived longer (7.58 ± 2.19 days) than that of the Sahelian
area (7.44 ± 1.39 days). Furthermore, males lived longer than females
regardless of the strain origin. The egg laying activity showed that the eggs
laid number was not statistically different according to the two areas. But it
appeared that more than 94% of the eggs were laid in the first four days of
cowpea seed infestation. The larvae survival rate and the rate of emergence
also varied according to the geographical strain origin. There were few data
recorded in Sahelian area where nearly 30% of the larvae did not reach adult
stage. In the Sahelo-Sudanese area, less than 4% of the hatched larvae reached
the adult stage. The sex-ratio also varied according to the geographic strain
origins. It was in favor of males in the Sahelian area and was in favor of
females in the Sahelo-Sudanese area.