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Selection of oviposition sites by the cowpea weevils Callosobruchus rhodesianus (Pic.) and Callosobruchus maculatus (F.)

Published online by Cambridge University Press:  19 September 2011

D. P. Giga
D. P. Giga
Affiliation:
University of Zimbabwe, Department of Crop Science, P.O. Box MP 167, Mount Pleasant, Harare, Zimbabwe
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Abstract

The oviposition behaviour of the cowpea weevils, Callosobruchus rhodesianus (Pic.) and Callosobruchus maculatus (F.) on clean and egg-laden adzuki beans was examined in choice and no-choice experiments. The oviposition rate of C. maculatus was greater than C. rhodesianus in both experiments. Both weevil species were able to distinguish between clean and egg-laden beans. Discrimination by both species was greater against seeds with 12 eggs than with 6, regardless of which species had previously laid eggs. There was a weak indication that the presence of C. maculatus eggs at high densities might reduce the oviposition rate of C. rhodesianus.

Résumé

Le comportement de ponte des charançons Callosobruchus rhodesianus (Pic) et Callosobruchus maculatus (F.) sur du haricot adzuki intact et du haricot porteur d'oeufs, a été éxaminé lors d'essais en présence de choix et en l'absence de choix. Le taux de dépôt d'oeufs de C. maculatus a été plus élevé par rapport à celui de C. rhodesianus dans les 2 essais. Toutes les 2 espèces de charançons ont été capables de distinguer du haricot intact et haricot porteur d'oeufs. La discrimination par les 2 espèces a été plus grande à l'égard des graines avec 12 oeufs qu'avec 6, indépendament de l'espèce pondeuse. Les résultate ont indiqué que la présence des oeufs de C. maculatus à de fortes densités pourrait réduire le taux de ponte de C. rhodesianus.

Keywords

Callosobruchus rhodesianusCallosobruchus maculatusoviposition site selectionchoiceno-choiceCallosobruchus rhodesianusCallosobruchus maculatuspontesélection de sitechoixabsence de choix
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 16 , Issue 2 , June 1995 , pp. 145 - 149
Copyright
Copyright © ICIPE 1995

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