Entomophaga

, Volume 31, Issue 4, pp 331–335 | Cite as

Predation byCheilomenes vicina [Coleoptera: Coccinellidae] on the cowpea aphid,Aphis craccivora [Homoptera: Aphididae]: Effect of prey stage and density

  • T. I. Ofuya
Article

Abstract

Consumption of larvae and females ofAphis craccivora Koch by 1st and 4th larvae and adults ofCheilomenes vicina (Muls.) was studied under fluctuating temperature (24–30°C). The early aphid instars were consumed in significantly greater numbers than later instars and females.

The feeding rates ofC. vicina were significantly positively correlated with the population density of prey. The number of prey consumed daily by each predator stage tested, increased more steeply at lower than at higher prey densities, exhibiting thus the type 2 functional response

Key-Words

Cheilomenes vicina Aphis craccivora prey consumption positive correlation type 2 functional response 

Résumé

Consommation des larves et des ♀ d'Aphis craccivora par les11e stades, les 4e stades et les adultes deCheilomenes vicina a été étudiée à une température variant de 24 à 30°C. Les jeunes stades du puceron sont consommés en nombre plus grand significativement que les derniers stades et les ♂.

Les taux d'alimentation deC. vicina manifestent une corrélation hautement significative avec la densité de population de la proie. Le nombre de proies consommées quotidiennement par chaque stade considéré du prédateur augmentait plus brusquement aux faibles qu'aux fortes densités de proies, manifestant ainsi chez le prédateur le type 2 de réponse fonctionnelle.

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Copyright information

© Lavoisier Abonnements 1986

Authors and Affiliations

  • T. I. Ofuya
    • 1
  1. 1.Department of Plant ScienceUniversity of IfeIle-IfeNigeria

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