Abstract
Aedes aegypti is responsible for the spread of various public health diseases and mostly synthetic insecticides are being used for its control. However, regular and over use of these substances has lead to mosquito resistance and environment contamination. Plant based products are natural alternatives to replace the commercial synthetic insecticides. This study was conducted to assess the ovicidal, larvicidal and pupicidal potential of the extract prepared from dried neem seed kernels against Aedes aegypti. Larvicidal activity of neem seed kernel extract (NSKE) was tested using five different concentrations viz., 100, 200, 300, 400 and 500 ppm against all four instars of Ae. aegypti. Ovicidal and pupicidal activity was evaluated by exposing fresh viable eggs and pupae to three concentrations of NSKE, below its effective larvicidal concentration i.e. 200, 300 and 400 ppm. Calculated values for LC50 were recorded as 49.96, 66.39, 77.19 and 83.57 ppm and for LC90 values were 186.53, 228.86, 286.69 and 358.02 ppm, respectively for LI, LII, LIII and LIV instars of Ae. aegypti till 48 hours of exposure to NSKE. Treatment of NSKE with 300 and 400 ppm showed 100% ovicidal activity and significant mortality of both male and female pupae in comparison to control sets. These results indicate that NSKE could be used as larvicidal, ovicidal and pupicidal plant based agent for the efficient control of Ae. aegypti in future.
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Acknowledgement
Authors are thankful to the Head, Department of Zoology, for providing all the necessary facilities and Department of Science and Technology, Government of India, New Delhi, for providing infrastructural facilities under FIST grant and also to Dr Sarita Kumar, Professor of Zoology, Department of Zoology, Acharya Narendra Dev College, New Delhi (India) for providing eggs of Ae. aegypti for the conduct of ovicidal study.
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The idea of the research was conceptualized and designed by D K Kocher and the experiments were conducted by N Kaur. Data was recorded by N Kaur and it was analysed and compiled in the form of research paper by both the authors. Draft of MS was prepared by both the authors and it was revised and finalized by D K Kocher.
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Kaur, N., Kocher, D.K. Ovicidal, larvicidal and pupicidal potential of neem seed kernel extract against Aedes aegypti L.. Int J Trop Insect Sci 43, 1089–1096 (2023). https://doi.org/10.1007/s42690-023-01020-8
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DOI: https://doi.org/10.1007/s42690-023-01020-8