Insect Science and its Application (1997) 17, 137-142
Charles O. Omwega and William A. Overholt (1997)
Progeny production and sex ratios of field populations of the parasitoids Cotesia flavipes and Cotesia sesamiae reared from gramineous stemborers in coastal Kenya
Insect Science and its Application 17 (1), 137-142
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.
La production de progeniture et les rapports des sexes des parasitoides Cotesia sesamiae (Cameron) (Hymenoptera: Braconidae) et son congenere exotique Cotesia flavipes Cameron (Hymenoptera: Braconidae) eclos de trois especes de foreurs de tiges collectes dans la nature furent compares. Il n y avait pas de differences numeriques significatives dans la progeniture produite par les deux parasitoides issus des foreurs de tiges africains, Chilo orichalcociliellus (Strand) (Lepidoptera: Pyralidae) et Sesamia calamistis Hampson (Lepidoptera: Noctuidae). Cotesia flavipes produisit une plus nombreuse progeniture que C. sesamiae sur de grandes larves de son hote asiatique evolutivement associe, Chilo partellus (Swinhoe). Il n'y avait pas de differences numeriques significatives dans la progeniture du parasitoide en rapport avec les differentes tailles des larves de Ch. orichalcociliellus ou S. calamistis. Ces donnees suggerent que dans des conditions naturelies, Co. flavipes pourrait etre superieur a Co. sesamiae comme parasitoide de son hote evolutivement associe, Ch. partellus.
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Database assignments for author(s): C.O. Omwega, William A. Overholt
Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution
