Mortality factors affecting Callosobruchus maculatus (F.) (Coleoptera: Bruchidae) under field conditions in Niger
DOI: 10.1016/0022-474X(94)90274-7
Title: Mortality factors affecting Callosobruchus maculatus (F.) (Coleoptera: Bruchidae) under field conditions in Niger
Journal Title: Journal of Stored Products Research
Volume: 30
Issue: 1
Publication Date: January 1994
Start Page: 71
End Page: 74
Published online: online 19 January 2004
ISSN: 0022-474X
Author: Sankung B. Sagnia
Affiliations:
  • Département de Formation en Protection des Végétaux (DFPV), AGRHYMET Centre, P.O. Box 12625, Niamey, Niger
  • Abstract: iment was conducted to study the impact of various factors affecting the development of Callosobruchus maculatus (F.) by infesting cowpea pods with eggs and exposing them to field conditions in Niamey, Niger. It was designed to determine the extent of field Mortality of the pest from oviposition to adult emergence. The duration of the life cycle ranged from 18 to 28 days with a mean of 22.9 days. A higher Mortality was recorded in the egg stage than in any other developmental stage. Egg parasitism by Uscana lariophaga Steffan (Hymenoptera: Trichogrammatidae) was the most important Mortality factor identified, followed by the disappearance of eggs from the surface of pods. These two factors together accounted for the loss of three quarters of the total number of eggs. Natural death in the larval stage in the seeds was the third most important Mortality factor, whereas parasitism by Eupelmus vuilleti (Cwf.) (Hymenoptera: Eupelmidae) and natural death in the pupal stage were the least important factors. These results indicate a great degree of regulation of bruchid populations by natural Mortality factors acting at field level.
    Received: 29 July 1993
    Keywords: Development; mortality factors; Callosobruchus maculatus; Uscana lariophaga; Niger

    Please Share this Paper with friends:
    Comment
    No.
    Comment Content
    User Name
    Date
    Post new Comment
    UserName
    Post to Facebook
    ×
    Search Full Text