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Functional response of an egg parasitoid, Trichogramma chilonis Ishii to sublethal imidacloprid exposure. | LitMetric
Background : The effectiveness of a biological control agent depends on how well it can control pests and how compatible it is with pesticides. Therefore, we reported the multigenerational effect of a commonly used insecticide, imidacloprid, on the functional response of a widely acclaimed egg parasitoid, Trichogramma chilonis Ishii, to different densities of the host Corcyra cephalonica Stainton eggs. The study investigated the outcomes of the median lethal concentration (LC ) and sublethal concentrations (LC , LC ), along with control treatments for five continuous generations (F to F ).Results : The results showed that the F generation of LC , both of the F and F generations of LC , and the control all had a Type II functional response. A Type I functional response was exhibited for the F generation of LC and both generations of LC . The attack rate on host eggs treated with LC and LC did not change (decrease) with the shift in the type of functional response as compared to the control. A significant increase in the searching efficiency (a) was observed in the later generation (F ) under the exposure of LC and LC imidacloprid concentrations. A lower handling time (T ) in both generations of the LC followed by LC treated individuals was observed when compared with the control and LC treatments. The per capita parasitization efficiency (1/T ) and the rate of parasitization per handling time (a/T ) were also considerably higher in both the generations of LC and LC than in the control and LC , thereby implying positive effects of imidacloprid on the parasitization potential of T. chilonis.Conclusion : Altogether, these multigenerational outcomes on the functional response of T. chilonis could be leveraged to control the intractable lepidopteran pests under the mild exposure of imidacloprid in integrated pest management (IPM) programs as well as in the mass rearing of the parasitoid, T. chilonis. © 2023 Society of Chemical Industry.
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