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Sex Ratio of Campoletis Chlorideae Uchida in Response to Helicoverpa Armigera (Hübner) Density

Published online by Cambridge University Press:  19 September 2011

Nikhil Kumar ,
Arvind Kumar  and
C. P. M. Tripathi
Nikhil Kumar
Affiliation:
Laboratory of Entomology, Department of Zoology, University of Gorakhpur, Gorakhpur- 273 009, India
Arvind Kumar
Affiliation:
Laboratory of Entomology, Department of Zoology, University of Gorakhpur, Gorakhpur- 273 009, India
C. P. M. Tripathi
Affiliation:
Laboratory of Entomology, Department of Zoology, University of Gorakhpur, Gorakhpur- 273 009, India
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Abstract

Experiments were conducted to elucidate the effect of host density on sex ratio of parasitoid offspring, using Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) and its endoparasitoid Campoletis chlorideae Uchida (Hymenoptera: Ichneumonidae). The sex ratio of Campoletis chlorideae was female-biased showing a linear decrease with increasing parasitoid density at fixed host densities. However, with more hosts available, the number of parasitoids emerging increased, stabilising after a density of 32 hosts per parasitoid. To obtain a female-biased sex ratio, a low density of parasitoids should be released at a recommended site.

Réesumée

Des essais ont été menés pour élucider l'effet de densités de Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) sur le sex-ratio de son endoparasitoïde, Campoletis chlorideae Uchida (Hymenoptera: Ichneumonidae). Le sex-ratio de C. chlorideae tendait à être biaisé dans le sens de la production de peu de femelles et montrait leur réduction linaire au fur et à mesure de l'augmentation de la densité des parasitoïdes maintenus sur un nombre constant de l'hôte. Cependant, l'effectif de parasitoïdes éclos augmentait avec la disponibilité du nombre d'hôtes et se stabilisait après que la densité de l'hôte atteignait 32 hôtes par parasitoïde. Dans le but d'obtenir un sex-ratio avec plus de femelles, il serait recommandable de lâcher une petite densité du parasitoïde, sur un site donné.

Keywords

Campoletis chlorideaeHelicoverpa armigerasex ratioparasitoid-host interactionCampoletis chlorideaeHelicoverpa armigerasex-ratiointeraction hôte-parasitoïde
Type
Short Communication
Information
International Journal of Tropical Insect Science , Volume 20 , Issue 1 , March 2000 , pp. 73 - 76
Copyright
Copyright © ICIPE 2000

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