Host-stage selection by Trybliographa rapae, a parasitoid of the cabbage root fly Delia radicum |
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Authors: | Nathalie Neveu Liliane Krespi Nabila Kacem and Jean-Pierre Nénon |
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Affiliation: | (1) Equipe d'Ecobiologie des Insectes Parasitoïdes, Université de Rennes 1, Avenue du Général Leclerc, 35042 Rennes Cedex, France |
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Abstract: | Host-stage selection by Trybliographa rapae Westwood (Hymenoptera: Figitidae) was studied in choice and no-choice experiments in the laboratory. The parasitoid was able to reproduce in first, second, and third instars of the cabbage root fly, Delia radicum L. (Diptera: Anthomyiidae), but oviposition occurred more frequently in third instars when all three developmental stages were offered simultaneously. Oviposition in third instars increased the rate of development of offspring and their body size, but did not alter sex ratio. Results are discussed in the light of predictions made by the theory of optimal host acceptance. |
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Keywords: | Trybliographa rapae Delia radicum parasitoid host-stage acceptance host quality preference biological control |
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