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Effects of diet change on the reproductive parameters of the cotton stainers Dysdercus cardinalis and D. fasciatus (Hemiptera: Pyrrhocoridae)

Published online by Cambridge University Press:  19 September 2011

Beatrice Tengecho  and
Battan M. Khaemba
Beatrice Tengecho
Affiliation:
Kenyatta University, Zoology Department, P.O. Box 43844, Nairobi, Kenya
Battan M. Khaemba
Affiliation:
Moi University, Zoology Department, P.O. Box 3900, Eldoret, Kenya
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Abstract

Diet change in the cotton stainers, Dysdercus cardinalis and D.fasciatus, occasioned by their migration from Gossypium hirsutum (cotton) to alternate hosts Sterculia rhynchocarpa and Adansonia digitata, was overall beneficial to their bionomics. Only the host Abutilon mauritianum appeared to possess antibiotic effects against the fecundity, fertility and longevity of the stainers. The occurrence in tropical natural ecosystems of both suitable and unsuitable hosts appears to constitute a vital and a viable stainer population-regulatory mechanism. Overall, D. cardinalis exhibited superior reproductive parameters on a variety of diets than did D. fasciatus. The latter apparently suffered profound negative effects on its bionomics when feeding on certain hosts.

Résumé

Le changement d'alimentation chez les punaises du coton, Dysdercus cardinalis et D. fasciatus, résultant de leur migration du coton, (Gossypium hirsutum), vers d'autres plantes-hôtes comme Sterculia rynchocarpa et Adansonia digitata était globalement bénéfique pour leurs bionomies. Seul Abutilon mauritianum qui est aussi une plante-hôte, a révélé des effets antibiotiques sur la fécondité, la fertilité et la longévité de ces punaises. La présence des plantes nourricières propres et celles qui ne sont pas propices semble constituer un noeud vital de régulation des populations de ces punaises. De surcroît, D. cardinalis a fait montre des paramètres supérieurs de reproduction sur une large gamme de diètes plus que D. fasciatus. Cette dernière punaise était apparemment affectée par des effets négatifs très prononcés dans ses bionomies, une fois qu'elle était élevée sur certaines plantes-hôtes.

Keywords

cotton stainersDysdercus cardinalisD.fasciatusdiet changealternate hostsfecundityfertilitylongevitypunaises du cotonDysdercus cardinalisD. fasciatuschangement de dièteshôte alternatifsféconditéfertilitélongévité
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 18 , Issue 3 , September 1998 , pp. 211 - 215
Copyright
Copyright © ICIPE 1998

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