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Host discrimination byChelonus insularis [Hym.: Braconidae], telenomus heliothidis [Hym.: Scelionidae], andTrichogramma pretiosum [Hym.: Trichogrammatidae]

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Abstract

The ability of female parasitoids (Chelonus insularis Cresson,Telenomus heliothidis Ashmead, andTrichogramma pretiosum Riley) to distinguish between parasitized and unparasitized tobacco budworm,Heliothis virescens (F.), eggs was determined in laboratory studies. All 3 species were relatively efficient at detecting eggs that were previously parasitized by conspecific females.T. heliothidis andT. pretiosum were able to discriminate on the basis of external examination of host eggs, whereasC. insularis appeared to examine hosts internally as well as externally. In interspecific tests, no species readily rejected eggs parasitized by the other 2 species.

Résumé

L'aptitude des femelles parasitoides (Chelonus insularis Cresson,Telenomus heliothidis Ashmead, etTrichogramma pretiosum Riley) à discerner les œufs de «vers du bourgeon» du tabac,Heliothis virescens (F.), qui sont parasités de ceux qui ne le sont pas, a été analysée par des études de laboratoire. Les 3 espèces ont été relativement efficaces en distinguant les œufs qui avaient été parasités auparavant par des femelles conspécifiques.Telenomus heliothidis etTrichogramma pretiosum pouvaient les discerner par examen externe tandis queC. insularis semblait pouvoir discerner les hôtes parasités par examen externe ou interne. Dans des essais interspécifiques, chacune des espèces a distingué faiblement les œufs parasités par les 2 autres espèces.

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Authors and Affiliations

  1. Cotton Insects Research, P. O. Drawer DG, U.S.D.A. SEA/AR, 77840, College Station, TX, USA

    J. R. Ables

  2. Department of Entomology, Texas A & M University, 77843, College Station, TX, USA

    S. B. Vinson

  3. Department of Entomology and Economic Zoology, Clemson University, 29631, Clemson, SC, USA

    J. S. Ellis

Authors
  1. J. R. Ables
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  2. S. B. Vinson
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  3. J. S. Ellis
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Approved for publication in TA-15908 by Director, Texas Agricultural Experiment Station.

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Ables, J.R., Vinson, S.B. & Ellis, J.S. Host discrimination byChelonus insularis [Hym.: Braconidae], telenomus heliothidis [Hym.: Scelionidae], andTrichogramma pretiosum [Hym.: Trichogrammatidae] . Entomophaga 26, 149–155 (1981). https://doi.org/10.1007/BF02375029

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  • DOI: https://doi.org/10.1007/BF02375029

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