Impact of males on the progeny sex ratio of Campoletis chlorideae (Hym., Ichneumonidae), a parasitoid of Helicoverpa armigera (Hubner) (Lep., Noctuidae)

• Published in: Journal of applied entomology (1986) Vol. 128; no. 4; pp. 254 - 257
• Main Authors: Pandey, P, Kumar, N, Tripathi, C.P.M
• Format: Journal Article
• Language: English
• Published: Berlin, Germany Blackwell Verlag GmbH 01.05.2004; Blackwell
• Subjects: arrhenotoky; Biological and medical sciences; Biological control; biological control agents; Campoletis; Campoletis chlorideae; Control; Fundamental and applied biological sciences. Psychology; Helicoverpa armigera; host density; host-parasite relationships; Ichneumonidae; insect pests; insect reproduction; male presence; males; Noctuidae; parasitoid density; parasitoids; Phytopathology. Animal pests. Plant and forest protection; population density; presence of males; progeny; progeny sex ratio; Protozoa. Invertebrates; sex ratio; Sex ratio; Progeny; Parasitoid; Helicoverpa armigera; Arthropoda; Insecta; Lepidoptera; Male; Noctuidae; Ichneumonidae; Hymenoptera; Invertebrata
• ISSN: 0931-2048; 1439-0418
• DOI: 10.1111/j.1439-0418.2004.00816.x

:  The endoparasitoid Campoletis chlorideae and its host Helicoverpa armigera were reared in the laboratory to determine the progeny sex ratio of C. chlorideae in the presence and absence of male parasitoids. It was observed that the presence of male parasitoids affects the progeny sex ratio by decreasing the number of females in the offspring population, i.e. a significant increase in the proportion of males was observed in united sexes. Therefore, while constructing the life table of the parasitoid, the effect of presence of male parasitoids, should be considered together with other factors, which decreases the efficiency of the parasitoid.