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Functional responses of two chrysopid predators feeding onHelicoverpa armigera (lep.: noctuidae) and aphis gossypii (hom.: aphididae)

Réponses fonctionnelles de deux espèces de chrysopes, prédatrices deHelicoverpa armigera (Lep. : Noctuidae) et d’Aphisgossypii (Horn. : Aphididae)

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Abstract

Predation onHelicoverpa armigera (Hubner) eggs andAphis gossypii (Glover) nymphs by 3rd instar larvae ofMallada desjardinsi (Navas) andChrysoperla congrua (Walker) was studied under laboratory conditions. Single predators that had been starved for 24 hours were isolated for 1 hour in 9 cm Petri dishes containing prey at densities of 5, 10, 15, 20 and 25 per dish. A type II functional response model gave a satisfactory fit to the data in case ofM. desiardinsi preying onH. armigera. However, with C.congrua, a type III model gave a slightly better fit. ForA. gossypii, functional responses of both predators did not differ from type II, withM. desjardinsi showing a significantly lower search rate and shorter handling time thanC. congrua. Implications of these findings are discussed

Résumé

La prédation d’œufs deHelicoverpa armigera et de nymphes d’Aphisgossypii par des larves de 3° stade deMallada desjardinsi etChrysoperla congrua a été étudiée en laboratoire. Des larves, précédemment privées de nourriture pendant 24 heures, ont été placées isolément dans des boîtes de Petri (9 cm de diamètre) en présence de proies à une densité de 5, 10, 15, 20 et 25 individus. La prédation d’A.gossypii parM. desjardinsi présentait un modèle de réponse fonctionnelle de type II : dans le cas deC. congrua, la prédation était plutôt un modèle de type III. En présence d’A.gossypii, les réponses fonctionnelles des deux espèces prédatrices correspondent à un modèle de type II mais M.desjardinsi montre une vitesse de recherche significativement plus faible et un temps de manipulation plus court queC. congrua. Les implications de ces résultats sont discutées

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Authors and Affiliations

  1. Ilonga Agricultural Research and Training Institute, P.O. Kilosa, Tanzania

    J. C. B. Kabissa

  2. Department of Zoology and Marine Biology, University of Dar es Salaam, P.O. Box 35064, Dar es Salaam, Tanzania

    J. G. Yarro & H. Y. Kayumbo

  3. Department of Biological Sciences, Illinois State University, Felmley Hall 206 Normal, 61761-6901, Normal-Bloomington, Illinois, USA

    S. A. Juliano

  4. Ukiriguru Agricultural Research and Training Institute, P.O. Box 1433/4, Mwanza, Tanzania

    J. C. B. Kabissa

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  1. J. C. B. Kabissa
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  3. H. Y. Kayumbo
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  4. S. A. Juliano
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Kabissa, J.C.B., Yarro, J.G., Kayumbo, H.Y. et al. Functional responses of two chrysopid predators feeding onHelicoverpa armigera (lep.: noctuidae) and aphis gossypii (hom.: aphididae) . Entomophaga 41, 141–151 (1996). https://doi.org/10.1007/BF02764242

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