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Functional and Numerical Responses of Coccinella transversalis Fab. and Cheilomenes sexmaculatus Fab. Feeding on the Melon Aphid, Aphis gossypii Glov.

Published online by Cambridge University Press:  19 September 2011

R. Veeravel  and
P. Baskaran
R. Veeravel*
Affiliation:
Department of Entomology, Faculty of Agriculture, Annamalai University, Annamalainagar-608 002, India
P. Baskaran
Affiliation:
Department of Entomology, Faculty of Agriculture, Annamalai University, Annamalainagar-608 002, India
*
Corresponding author: RV.
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Abstract

The functional response in terms of prey consumption and numerical response in terms of number of eggs laid by individual female adult predators of Coccinella transversalis Fab. and Cheilomenes (Menochilus) sexmaculatus Fab. (Coccnellidae: Coleoptera) at varied prey (Aphis gossypii Glover) (Aphididae: Homoptera) densities were investigated under laboratory conditions. The feeding rate by individual predators increased at increased prey densities, with both the coccinellids showing the Type II functional response. One hundred percent prey consumption was observed up to an initial prey density of 50 and 20 for Co. transversalis and Ch: sexmaculatus respectively. The fecundity of Co. transversalis increased at higher prey densities, but that of Ch. sexmaculatus remained unchanged.

Résumé

La réponse fonctionnelle en termes de prédation et la réponse numérique reflétée par le nombre d'oeufs individuellement pondus par les femelles matures de Coccinella transversalis Fab. et Cheilomenes (Menochilus) sexmaculatus Fab. (Coleoptera: Coccinellidae) a été étudiées dans des conditions de laboratoire, sur des densités variées de proie du puceron, Aphis gossypii Glover (Homoptera: Aphididae). Le taux de consommation par les prédateurs isolés allait de pair avec l'augmentation de la densité de proie et toutes les deux coccinelles montraient une réponse de prédation du Type II. Avec une densité respective de 50 et 20 pucerons, on a enregistré 100% de prédation pour C. transversalis et C. sexmaculatus. Chez C. transversalis, la fécondité augmentait avec l'accroissement de la densité de proie tandis que chez C. sexmaculatus cette fécondité est restée inchangée.

Keywords

functional responsenumerical responseCoccinella transversalisCheilomenes sexmaculatusAphis gossypiieggplantprey densityréponse fonctionnelleréponse numériqueCoccinella transversalisCheilomenes sexmaculatusAphis gossypiiauberginedensité de proie
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 17 , Issue 3-4 , December 1997 , pp. 335 - 339
Copyright
Copyright © ICIPE 1997

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