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parasitoid-host interaction

International Journal of Tropical Insect Science (1)

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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
Journal:

Insect Science and Its Application / Volume 20 / Issue 1 / March 2000

Published online by Cambridge University Press:

19 September 2011, pp. 73-76

Print publication:

March 2000
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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.