Evaluation of mosquito larvicidal effect of Nagarmotha (Cyperus rotundus) extracts against Aedes aegypti L. larvae
DOI:
https://doi.org/10.22377/ijgp.v7i1.294Abstract
Background: Mosquitoes transmit serious human diseases such as malaria, filariasis, Japanese encephalitis, dengue fever, dengue haemorrhagic fever and yellow fever causing millions of deaths every year. Extensive use of chemical insecticides for control of vector borne diseases has created problems related to physiological resistance to vectors, adverse environmental effects, high operational cost and community acceptance. Plants may be a source of alternative agents for control of mosquitoes because they are rich in bioactive chemicals and biodegradable. In this study, mosquito larvicidal activity of Cyperus rotundus against Aedes aegypti larvae was assessed in laboratory according to World Health Organisation guidelines 2005 with slight modification. Materials and Methods: Five concentrationsof petroleum ether (PE) and ethyl alcohol (EA) extracts of C. rotundus in the range of 200‑1000 ppm were used in bioassay against late 3rd and 4th instar larvae of A. aegypti. Observation of mortality response was assessed after 24 h. The mortality data were subjected to probit regression analysis to determine the median lethal concentration LC50 and LC90. C. rotundus. Results: PE extract and EA extract produce 98% and 97% mortality at 1,000 ppm, respectively. PE extracts exhibits LC50 443.80 ppm and LC90 882.98 ppm whereas EA extract exhibits
LC50 594.22 ppm and LC90 936.25 ppm. Conclusion: PE and EA extracts of C. rotundus showed good mosquito larvicidal potential.
Key words: Alternative insecticides, extracts, LC50, LC90, World Health Organisation guidelines
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