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International Journal of Zoology and Applied Biosciences Research Article
Adulticidal and ovicidal activities of Rhodomyrtus tomentosa leaf extracts against dengue vector Aedes aegypti
Muthu Kasinathan, Jayapal Subramaniam, Chakravarthy Elanchezhiyan, Samivel Kanthammal and Mayakrishnan Vijay
Year : 2018 | Volume: 3 | Issue: 2 | Pages: 224-230
Received on: 03/30/2018
Revised on: 04/25/2018
Accepted on: 04/27/2018
Published on: 04/30/2018
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Muthu Kasinathan, Jayapal Subramaniam, Chakravarthy Elanchezhiyan, Samivel Kanthammal and Mayakrishnan Vijay( 2018).
Adulticidal and ovicidal activities of Rhodomyrtus tomentosa leaf extracts against dengue vector Aedes aegypti
. International Journal of Zoology and Applied Biosciences, 3( 2), 224-230.
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Abstract
Mosquitoes has developed the resistance to synthetic insecticides, unfavorable effects to human and animal health, beneficial organisms and the environment, there is an urgent need to develop new insecticides of botanical based, which are suitable alternative bio control techniques with effective, safe, biodegrable and target-specific in the future. The adulticidal activities of crude hexane, acetone, and methanol extracts of the leaf of Rhodomyrtus tomentosa were assayed for their toxicity against dengue, chikungunya and zika virus vector, Aedes aegypti, the adult mortality was observed after 24 h of exposure. All extracts showed moderate adulticidal effects; however, the highest adult mortality observed was found in methanol extract. The LC50 and LC90 values of R. tomentosa leaf extracts against adulticidal activity of (acetone methanol and aqueous) A. aegypti, were the following: LC50 values were 113.09 ppm for (RTAE), 106.38 ppm for (RTME) and 125.25 ppm for (RTAQE); LC90 values were 251.18 for (RTAE), 229.94 for (RTME) ppm and 273.38 ppm for (RTAQE), respectively. The results of the ovicidal activity of acetone and methanol extracts of R. tomentosa plant at six different concentrations of 60-420 ppm were applied on eggs of A. aegypti. The toxicity of leaf extracts was dependent on its concentration against A. aegypti. There was zero hatchability (100% mortality) was attained at the concentration of 240 ppm for methanol extract and 300 ppm acetone extract and 360 ppm for aqueous extract. In this observation, this plant crude extracts gave the potential to be used as an ideal eco-friendly approach for the control of mosquitoes. This is the first report on mosquito adulticidal and ovicidal activities of the tribal medicinal plant, R. tomentosa against mosquito vectors from Southern India.
Keywords
Insecticide, Vector borne diseases, Eco friendly, Public health, Crude extracts.
