Relative larvicidal potentiality of nano-encapsulated Temephos and Imidacloprid against Culex quinquefasciatus

다국어 초록 (Multilingual Abstract)

Encapsulation of temephos ranging from 1% to 16% and imidacloprid from 1% to 8% within biodegradable andbiocompatible, polyethylene glycol in different ratios was done by using melt-dispersion method. The efficacyof encapsulated forms was evaluated and compared with their non-capsulated forms against larvae of Culexquinquefasciatus. The encapsulated temephos was more toxic than the encapsulated imidacloprid with LC50values of 0.013, 0.010 and 0.003 mg/L after 24, 48 and 72 h, respectively. No doubt, the non-capsulated temephosand imidacloprid were more effective as compared to their encapsulated forms. However, the same mortalityrate was achieved by the slow release of lesser amount of pesticides after encapsulation, e.g., 0.003 mg/L for 8%temephos formulation and 0.019 mg/L for 4% imidacloprid as compared to their non-capsulated form oftemephos and imidacloprid (0.004 and 0.021 mL/L) after 72 h of exposure. Thus, encapsulated forms are moreeconomical and eco-friendly due to controlled slow release of their nanoparticles.

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