Abstract
The parasitoidEphedrus cerasicola Starý oviposited in all 4 nymphal instars and in newly moulted adults ofMyzus persicae (Sulzer). The different host categories were offered with no choice. The duration of an oviposition increased with the age of nymphs, being about 13, 18, 21, 22, and 17 s from 1 st instars to adults, respectively. Observations of number of stabbing attacks prior to oviposition, percent of the encounters not resulting in oviposition, time from first encounter to oviposition, handling time and aphid defensive behaviour also indicated that 1 st instarM. persicae are most easily parasitized.
The behaviour ofE. cerasicola in encounters with unparasitized and parasitized hosts, suggested that the parasitoid could discriminate. In encounters with parasitized 1 st to 4th instar aphids,E. cerasicola used only the antennae in 80% of the encounters that resulted in discrimination.
Résumé
Le parasitoïdeEphedrus cerasicola STARÝ pond dans les 4 stades larvaires et le stade adulte des virginipares aptéres deMyzus persicae (SULZER). Les différents types d'hôtes sont présentés séparément. La durée d'oviposition augmente avec le stade, soit: 13, 18, 21, 22 et 17s dans les stades successifs. L'observation du nombre de piqûres, le pourcentage de rencontres sans oviposition, le temps de ponte et le comportement défensif des aphides traduisent la facilité avec laquelle lesM. persicae du 1c stade sont parasités.
Le comportement d'E. cerasicola au cours de ses rencontres avec des hôtes parasités ou non, Indique que le parasitoïde est capable de discriminer. Au cours de ses rencontres avec des aphides du 1c au 4c stade déjà parasités,E. cerasicola n'a employé que ses antennes dans 80% de cas où il y avait discrimination.
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Hofsvang, T., Hågvar, E.B. Oviposition behaviour ofEphedrus cerasicola [Hym.: Aphidiidae] parasitizing different instars of its aphid host. Entomophaga 31, 261–267 (1986). https://doi.org/10.1007/BF02373335
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DOI: https://doi.org/10.1007/BF02373335