Host discrimination byChelonus insularis [Hym.: Braconidae], telenomus heliothidis [Hym.: Scelionidae], andTrichogramma pretiosum [Hym.: Trichogrammatidae] |
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Authors: | J. R. Ables S. B. Vinson J. S. Ellis |
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Affiliation: | (1) Cotton Insects Research, P. O. Drawer DG, U.S.D.A. SEA/AR, 77840 College Station, TX, USA;(2) Department of Entomology, Texas A & M University, 77843 College Station, TX, USA;(3) Department of Entomology and Economic Zoology, Clemson University, 29631 Clemson, SC, USA |
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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. |
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