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Progeny Production and Sex Ratios of Field Populations of the Parasitoids Cotesia Flavipes and Cotesia Sesamiae Reared from Gramineous Stemborers in Coastal Kenya

Published online by Cambridge University Press:  19 September 2011

Charles O. Omwega  and
William A. Overholt
Charles O. Omwega
Affiliation:
International Centre of Insect Physiology and Ecology, P.O. Box 30772, Nairobi, Kenya
William A. Overholt
Affiliation:
International Centre of Insect Physiology and Ecology, P.O. Box 30772, Nairobi, Kenya
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Abstract

Progeny production and sex ratios of the parasitoids Cotesia sesamiae (Cameron) (Hymenoptera: Braconidae) and its exotic congener Cotesia flavipes Cameron (Hymenoptera: Braconidae) emerging from three species of field-collected stemborers were compared. There were no significant differences in numbers of progeny of the two parasitoids from the African stemborers, Chilo orichalcociliellus (Strand) (Lepidoptera: Pyralidae) and Sesamia calamistis Hampson (Lepidoptera: Noctuidae). Cotesia flavipes produced more progeny than C. sesamiae on large larvae of its coevolved Asian host, Chilo partellus (Swinhoe). No significant differences in the number of parasitoid progeny were observed for different-sized Ch. orichalcociliellus or S. calamistis larvae. These data suggest that under field conditions, Co. flavipes may be superior to Co. sesamiae as a parasitoid of its co-evolved host, Ch. partellus.

Keywords

stemborerparasitoidprogenysex ratiosChilo partellusChilo orichalcociliellusCotesia flavipesCotesia sesamiaeSesamia calamistisforeur de tigesparasitoïdeprogéniturerapport des sexesChilo partellusChilo orichalcociliellusCotesia flavipesCotesia sesamiaeSesamia calamistis
Type
Articles
Information
International Journal of Tropical Insect Science , Volume 17 , Special Issue 1: Ecology and Management of Tropical Gramineous Stemborers , March 1997 , pp. 137 - 142
Copyright
Copyright © ICIPE 1997

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