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Host parasitoid interactions affecting reproduction and oviposition byBrachymeria intermedia [Hym.: Chalcididae]

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Abstract

A maximum number of 6 parasitoid progeny are produced byBrachymeria intermedia (Nees) females, in a 24 h period, even when more than 6 hosts are available. The number of progeny produced by ovipositing females kept at a high temperature or high light intensity is greater than that of females kept at low temperatures or low light intensity. Host size and age of female parasitoids affect the sex ratio or progeny. Parasitism of small pupal hosts results in the production of a greater proportion of male progeny. Increasing maternal age appears to increase the proportion of males.

Résumé

Les femelles deBrachymeria intermedia (Nees) ont un maximum de 6 descendances, sous une photopériode de 24 h, même en présence de plus de 6 hôtes. Le nombre de descendants de femelles maintenues à température élevée (26°C) ou sous une forte intensité lumineuse est plus grand que celui de femelles placées à basse température (15°C) ou sous une faible intensité lumineuse. La taille de l'hôte et l'âge de la femelle du parasitoïde affectent la proportion des sexes ou la fécondité. Le parasitisme de petites chrysalides a pour résultat une proportion plus grande de mâles dans la descendance. L'augmentation de l'âge de la femelle accroît également la proportion de mâles.

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Author notes

  1. E. A. Frongillo Jr.

    Present address: Division of Nutritional Sciences, Cornell University, 14853, Ithaca, New York

Authors and Affiliations

  1. Department of entomology, University of Massachusetts, 01003, Massachusetts, Amherst, USA

    P. Barbosa & E. A. Frongillo Jr.

Authors
  1. P. Barbosa
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  2. E. A. Frongillo Jr.
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Additional information

Paper No. Massachusetts Agricultural Experiment Station, University of Massachusetts at Amherst, MA., U.S.A. This research supported (in part) from Experiment Station Project No. 437 and a U.S.D.A. sponsored program entitled, “The Expanded Gypsy Moth Research and Development Program” (CSRS Special Grant No. 516-15-57).

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Barbosa, P., Frongillo, E.A. Host parasitoid interactions affecting reproduction and oviposition byBrachymeria intermedia [Hym.: Chalcididae] . Entomophaga 24, 139–143 (1979). https://doi.org/10.1007/BF02375127

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