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Offspring sex ratio of a cereal aphid parasitoid, Lysiphlebus delhiensis (Subba rao & Sharma) in response to maternal crowding

Published online by Cambridge University Press:  19 September 2011

Shilu Biswas  and
Rajendra Singh
Shilu Biswas
Affiliation:
Aphid Biocontrol Laboratory, Department of Zoology, University of Gorakhpur, Gorakhpur-273 009, UP, India
Rajendra Singh
Affiliation:
Aphid Biocontrol Laboratory, Department of Zoology, University of Gorakhpur, Gorakhpur-273 009, UP, India
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Abstract

The effect of maternal crowding on the offspring sex ratio of a cereal aphid parasitoid Lysiphlebus delhiensis (Subba Rao & Sharma) (Hymenoptera: Braconidae) was examined. Increasing the number of mothers per host-patch always increased the proportion of males in the population (p). The extent of variations in p at different levels of maternal crowding was compared with the prediction of the Hamiltonian LMC model, i.e. p = (n-1)/2n, where n = number of mothers/host-patch. The perception of trace odours of conspecific females induced haploid oviposition. Differential mortality of the larvae by sex in superparasitised hosts, shifting the p towards sons has been discussed. The inversely parasitoid-density-dependent p indicates that for obtaining maximum number of female progeny, the ratio of female parasitoid to the host in mass breeding should not be less than 1:100 at a time.

Résumé

L'effet de la surpopulation maternelle sur le rapport des sexes dans la progéniture d'un parasitoïde du puceron des céréales Lysiphlebus delhiensis (Subba Rao & Sharma) a été examiné. L'augmentation du nombre de mères par hôte s'accompagnait toujours d'une augmentation de la proportion des mâles dans la population (p). Le degré des variations de p à différents niveaux de surpopulation maternelle a été comparé à la prédiction du modèle Hamiltonian LMC, à savoir p = (n-1)/2n, où n = le nombre de mères/hôte. La perception des traces d'odours de femelles conspécifiques induisait la production d'oeufs haploïdes. La mortalité larvaire differentielle par sexe chez les hôtes superparasites, faisant basculer les valeurs de p en faveur des mâles a été discutée. Les valeurs de p en rapport inverse de la densité du parasitoïde montre que pour obtenir un nombre maximal de femelles dans la progéniture, le rapport du parasitoïde femelle par hôte en élevage en masse ne devrait jamais être inférieur à 1:100.

Keywords

Lysiphlebus delhiensisMelanaphis sacchariZea maysaphidsparasitismAphididaebiological controlsex ratioparasitoid densitymaternal crowdingLysiphlebus delhiensisMelanaphis zacchariZea maysparasitismeAphididaelutte biologiquedensité du parasitoïdesurpopulation maternelle
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 16 , Issue 3-4 , December 1995 , pp. 287 - 291
Copyright
Copyright © ICIPE 1995

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