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Functional responses to prey density ofEphedrus cerasicola [Hym.: Aphidiidae], an aphidiid parasitoid ofMyzus persicae [Hom.: Aphididae]

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Abstract

The functional responses of the parasitoidEphedrus cerasicola Starý parasitizingMyzus persicae (Sulzer) on a paprika plant, were studied for single females at different host densities (1 to 120 aphids per 1.8 dm3) during 3 different time periods (1 hr, 6 hrs, 24 hrs) at 21 °C.

The response during 1 hr was curvilinear and is described by the random parasite equation according toRogers (1972). A maximum of 5–6 aphids could be parasitized during 1 hr. After 6 hrs, the response was linear, although it showed a slight sigmoid trend. In the 24-hr experiment, the response was curvilinear, but due to high rate of parasitization together with superparasitism no curve was estimated. The area of discovery was calculated for all densities and exposure times and ranged from 0.15 to 0.79 (1 hr), 0.69 to 1.96 (6 hrs), and 0.81 to 3.21 (24 hrs).

Résumé

On a étudié les réponses fonctionnelles de femelles isolées du parasitoideEphedrus cerasicola Starý parasitantMyzus persicae Sulzer sur des plantes de paprika selon différentes densités en hôtes (de 1 à 120 pucerons pour 1,8 dm3) pendant 3 périodes (1h, 6h, 24h) à 21 °C. La réponse pendant 1 h est curvilinéaire et peut être décrite par l'équation de parasitisme au hasard établie parRogers (1972). Un maximum de 5–6 pucerons peuvent être parasités pendant 1 h. Après 6 h la réponse est linéaire avec une légère tendance sigmoide. Dans l'essai pendant 24 h la réponse est curvilinéaire mais, à cause du taux élevé de parasitisme et de superparasitisme, aucune courbe n'a pu être calculée. L'aire de découverte de l'hôte a été estimée pour toutes les densités et tous les temps; elle varie de 0,15 à 0,79 (1 h), 0,69 à 1,96 (6 h) et 0,81 à 3,21 (24 h) d'après l'équation deNicholson & Bailey (1935).

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Authors and Affiliations

  1. Agricultural Entomology, Agricultural University of Norway, P.O. Box 70, N-1432 Ås, NLH, Norway

    T. Hofsvang

  2. Department of Zoology, Agricultural University of Norway, P.O. Box 46, N-1432 Ås, NLH, Norway

    Eline B. Hågvar

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  1. T. Hofsvang
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  2. Eline B. Hågvar
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Hofsvang, T., Hågvar, E.B. Functional responses to prey density ofEphedrus cerasicola [Hym.: Aphidiidae], an aphidiid parasitoid ofMyzus persicae [Hom.: Aphididae] . Entomophaga 28, 317–324 (1983). https://doi.org/10.1007/BF02372183

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