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Comparative studies on biological performance of the cotton stainers Dysdercus cardinalis Gerst and Dysdercus fasciatus Signoret bred on different hosts

Published online by Cambridge University Press:  19 September 2011

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

In laboratory studies on the nymphal and adult performance of the cotton stainers Dysdercus cardinalis and D. fasciatus (Pyrrhocoridae: Hemiptera) on seeds of five different host plants, two categories of hosts with significantly (P < 0.05) different biological effects were identified. Gossypium hirsutum L., Ceiba pentrandra Gaertn and Sterculia rhynchocarpa (K. Schum) were found to be suitable hosts (category A) while Adansonia digitata L. and Abutilon mauritianum (Jacq. Medic.) were unsuitable (category B). Category A hosts that grew in the wild appear to serve as perennial breeding reservoirs for the cotton stainers and thus play a significant role in initiating and perpetuating their infestation of adjacent cotton crops. The converse appears to be true for category B hosts, whose long-term effect would be to gradually decrease the population of the cotton stainers.

Résumé

Au cours des essais de laboratoire portant sur la performance des stades nymphaux et adultes des punaises du cotonnier, Dysdercus cardinalis et D. fasciatus (Hemiptera: Pyrrhocoridae) sur les graines de cinq différentes plantes-hôtes, on a identifié deux catégories d'hôtes avec des effets biologiquement significatifs (P < 0,05). Gossypium hirsutum L., Ceiba pentrandra Gaertn et Sterculia rynchocarpa (K. Shum) se sont montrés comme étant des plantes-hôtes appropriées (Catégorie A), au moment où Adansonia digitata L. et Abutilon mauritianum (Jacq. Medic.) étaient inappropriés (Catégorie B). Les plantes-hôtes de la catégorie A qui poussaient à l'état sauvage semblent constituer des réservoirs permanents de reproduction pour les punaises du cotonnier. Ces plantes jouent un rôle impotant lors de l'initiation et la perpétuation des dégats infligés par les punaises, aux cultures adjacentes au cotonnier. L'inverse semble aussi être vrai pour les plantes-hôtes de la catégorie B dont l'effet à long terme servirait à faire baisser graduellement la population de punaises.

Keywords

nymphal and adult performancewild hostcotton stainersDysdercus cardinalisDysdercus fasciatusperformance des stades nymphaux et adulteshôtes sauvagespunaises du cotonnierDysdercus cardinalisDysdercus fasciatus
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 18 , Issue 1 , March 1998 , pp. 25 - 29
Copyright
Copyright © ICIPE 1998

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