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Yogita Sanap,Vishal V. Dawkar,Ashok P. Giri,Avalokiteswar Sen,Radhakrishna S. Pandit 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.1
Biological control agents are vital components of an integrated pest management strategy, and this is frequently referred to as natural control. Natural enemies of insect pests include predators, parasitoids, and pathogens. Among them, a parasitoid, Chelonus blackburni (Cameron), was found to be the best biological control agent for the polyphagous pest, Helicoverpa armigera (Hübner). C. blackburni alters the feeding performance of H. armigera larvae upon parasitism and as a result severely affects growth and development. Moreover, it shortens the feeding period of H. armigera and increases mortality. Furthermore, total hemocyte count (THC) was significantly decreased in parasitized larvae than control. Parasitized H. armigera had 26% less number of blood cells compared to healthy larvae. Histological studies showed that the structure of midgut of H. armigera is drastically affected by C. blackburni leading to reduced food consumption, which ultimately led to larval death. The present study provides an insight to changes involved in H. armigera due to parasitism by C. blackburni, a parasite that could be used as an effective biocontrol agent to manage H. armigera.