Abstract
Various aspects of the parasitims of caterpillars ofAscia monuste orseis byCotesia ayerzai, were studied in laboratory choice tests. Individual ♂♂ were found to be extremely variable in ovipositional duration, as well as in the number of eggs oviposited. To simulate parasitoid dispersal, or low host density, we isolated ♂♂ for 60 min following initial exposure and compared our tests with ♂♂ which had not been isolated. No differences in (1) the number of eggs oviposited per host instar; (2) the conditional probability of host encounter; (3) host acceptance; and (4) the conditional probability of instar specific parasitism were found between these groups. Held ♂♂ did, however, reject hosts after ovipositor insertions in a higher proportion.
Résumé
Divers aspects du parasitisme parCotesia ayerzai des chenilles d'Ascia monuste orseis ont été étudiés au laboratoire par des essais de choix. La durée de ponte, comme le nombre d'œufs déposés, sont extrêmement variables d'une femelle à l'autre. Pour simuler la dispersion du parasitoïde ou une faible densité d'hôtes, nous isolons les femelles durant une heure après l'exposition initiale et comparons nos essais avec les femelles qui n'ont pas été isolées. Il n'y a aucune différence entre ces groupes: (1) dans le nombre d'œufs déposés par stade hôte — (2) dans la probabilité de rencontre de l'hôtes — (3) dans l'acceptation de l'hôte et (4) dans la probabilité d'un parasitisme spécifique d'un stade. Cependant les femelles emprisonnées ne rejetaient pas les hôtes après des insertions de la tarière dans une plus grande proportion.
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Gobbi, N., Cunha, M.C.A., Zucchi, R. et al. Oviposition pattern byCotesia ayerzai [Hym.: Braconidae] onAscia monuste [Lep.: Pieridae] under laboratory conditions. Entomophaga 35, 195–202 (1990). https://doi.org/10.1007/BF02374793
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DOI: https://doi.org/10.1007/BF02374793