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Sex Ratio of Campoletis chlorideae Uchida in Response to Helicoverpa armigera (Hübner) Density

  • Nikhil Kumar
  • Arvind Kumar
  • C. P. M. Tripathi
Short Communication

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.

Key Words

Campoletis chlorideae Helicoverpa armigera sex ratio parasitoid-host interaction 

Résumé

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.

Mots Clés

Campoletis chlorideae Helicoverpa armigera sex-ratio interaction hôte-parasitoïde 

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Copyright information

© ICIPE 2000

Authors and Affiliations

  • Nikhil Kumar
    • 1
  • Arvind Kumar
    • 1
  • C. P. M. Tripathi
    • 1
  1. 1.Laboratory of EntomologyDepartment of Zoology University of GorakhpurGorakhpurIndia

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