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Competitive interaction between Cotesia kazak and Hyposoter didymator, exotic parasitoids of Heliothis armigera

Competitive interaction between two introduced parasitoids of Heliothis armigera (Hb.) i.e. the braconid Cotesia kazak Telenga and the ichneumonid Hyposoter didymator (Thunb.) was studied in the laboratory. C. kazak and H. didymator individually parasitized about 55% H. armigera larvae, the combination of the two parasitoids gave more than 75% parasitism. C. kazak was found to be more effective, when the host was exposed to both parasitoids at the same time, reduced H. didymator population by 69% to 24 h. It is, therefore, better to release these two parasitoids individually in different locations to avoid any possible competitive interaction between the two. No difference in developmental time was observed irrespective of parasitoid sequence.