Romanian Journal of Biology - Zoology

ROMANIAN ACADEMY
Institute of Biology -Bucharest



COMPARATIVE LARVICIDAL EFFICACY OF α-CYPERMETHRIN ALONE AND α-CYPERMETHRIN/CITRUS SINENSIS PEEL EXTRACT BINARY MIXTURES AGAINST AEDES AEGYPTI L.

DEVINA AGGARWAL, ROOPA RANI SAMAL, SARITA KUMAR*





 Abstract:


   Aedes aegypti is a widely spread disease vector of great concern throughout the world. With continuous rise in cases of Zika, dengue and Chikungunya worldwide, control of Ae. aegypti has become a prime concern. The present study investigated the larvicidal effects of individual and various combinations of Citrus sinensis hexane peel extract and a synthetic pyrethroid, alpha-cypermethrin against Ae. aegypti. Larvicidal bioassays were performed using WHO protocol with minor modifications. The investigated compounds were found effective individually as well in binary mixtures indicating the efficient synergism. Hexane extract of Citrus sinensis peels assayed against Aedes aegypti larvae resulted in LC50 of 46.53 ppm after exposure for 24 h, while alpha-cypermethrin treatment resulted in LC50 value of 0.0063 ppm. The binary mixtures of both the compounds in 1:1, 1:5 and 1:10 ratios also showed significant larvicidal potential. The 1:1 mixture was found most effective with co-toxicity coefficient and synergistic factor as 23.456 and 3.865, respectively, for the LC50 at 24h. The binary mixtures showed synergism as well as additive effects in all the ratios tested except 1:5 ratio for LC90 at 48h which showed inconsequential antagonistic effect. Results showed decreased synergistic effects with increase in the citrus extract proportion in the binary mixtures. We suggest that phytoextract/cypermethrin mixtures can be more operative than insecticide/phytoextract alone, and can be used as a good ecofriendly approach in vector control programs. Such mixtures could reduce the costs, reduce insecticide dose, and regulate insecticide resistance as part of integrated vector management.




 Citation:


   DEVINA AGGARWAL, ROOPA RANI SAMAL, SARITA KUMAR*, 2020. COMPARATIVE LARVICIDAL EFFICACY OF α-CYPERMETHRIN ALONE AND α-CYPERMETHRIN/CITRUS SINENSIS PEEL EXTRACT BINARY MIXTURES AGAINST AEDES AEGYPTI L., Romanian Journal of Biology - Zoology, 65(1-2): 83–98.




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