Abstract
The effect of different population densities ofTrioxys (Binodoxys) indicus Subba Rao & Sharma and its hostAphis craccivora Koch, on the sex ratio (female: male) of the parasitoid was observed. The sex ratio (favouring female sex) increased with increase of host density. Parasitoid contamination priciple and behavioural responses of female parasitoid in addition to environmental factors were applied to explain the results. Results clearly indicated that fewer parasitoid releases might be better at any immediate release site for the production of maximum female progeny in this species.
Résumé
On a étudié l’effet de différentes densités de population deTrioxys (Binodoxys) indicus Subba Rao & Sharma et de son hôte,Aphis craccivora Koch sur la proportion des sexes (femelle: mâle) de ce parasitoïde. La proportion de femelles s’accroît avec l’augmentation de la densité. Ce résultat est expliqué par les modalités d’infestation du parasitoïde, le comportement de la femelle et l’influence de facteurs du milieu. On en déduit que des lâchers de quantités faibles de parasitoïdes peuvent être préférables pour la production du maximum de descendance femelle chez cette espèce.
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Sinha, T.B., Singh, R. Studies on the bionomics ofTrioxys (Binodoxys) indicus [Hym.: Aphidiidae]: Effect of population densities on sex ratio. Entomophaga 24, 289–294 (1979). https://doi.org/10.1007/BF02374243
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DOI: https://doi.org/10.1007/BF02374243