Abstract
Larval tobacco hornworms,Manduca sexta (L.), of 2 different colonies were exposed to parasitism by the gregarious endoparasitoid,Cotesia congregata (Say). A comparison was made of parasitoid larval, pre-pupal, and pupal mortality, female and male dry weight and larval development time. In general, “Maryland” hornworms were more suitable hosts than “North Carolina” hornworms. Although the presence of dietary nicotine increased parasitoid mortality in individuals reared from hornworms of both colonies, the effect was more severe among individuals parasitizing the North Carolina hornworms.
Résumé
Une expérimentation a été entreprise afin de déterminer si les différences enregistrées entre deux colonies distinctes deM. sexta, affectées également par le régime nicotiné, influencent le développement, la survie et la taille de son parasitoïdeCotesia congregata. Les sphynx du tabac d'une colonie du Maryland et de la Caroline du Nord ont été élevés sur un milieu à 0,1 % de nicotine et exposés au parasitisme parC. congregata. Les individus de la colonie du Maryland furent en général de meilleurs hôtes que ceux de la colonie de Caroline du Nord. Bien que la nicotine ait des effects négatifs sur les deux colonies, ceux-ci furent plus sévères chez les individus parasitant les sphynx de Caroline du Nord.
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Scientific contribution No. 8125, article No. A-5066 of the Maryland Agricultural Experiment Station, Department of Entomology.
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Barbosa, P., Kemper, J., Gross, P. et al. Influence of dietary nicotine and colony source ofManduca sexta [Lepidoptera: Sphingidae] on its suitability as a host ofCotesia congregata [Hymenoptera: Braconidae]. Entomophaga 35, 223–231 (1990). https://doi.org/10.1007/BF02374797
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DOI: https://doi.org/10.1007/BF02374797