S. Hannah Catherine Raj* and N. Shettu
Several millions of people get affected by mosquito-borne sicknesses every year, and hence mosquito-borne sicknesses are regarded as major public health diseases. The vector mosquito Aedesaegypti transmits chikungunya fever, dengue fever, yellow fever viruses and Culexquinquefasciatus transmits filarial nematode and cause filariasis. In the present study, In the present study, the leaves of Cymbopogoncitratus, Azadirachtaindica,Tageteserecta, Eucalyptus deglupta and Syzygiumaromaticum were screened on Cx. quinquefasciatus and Ae. aegypti mosquito larvae. Ethanol extract of Eucalyptus deglupta leaves was found to be very active and the LC50 and LC90 results were 63.54ppm, 96.90ppm against Cx. quinquefasciatus and 72.19ppm, 137.90ppm against Ae. aegypti larvae, respectively. Eight fractions were obtained from the active extract and fraction 7 was identified to be very effective. The LC50 and LC90results of fraction-7 were 5.07ppm, 12.64ppm against Cx. quinquefasciatus larvae and 5.50ppm, 17.18ppm against Ae. aegypti larvae, respectively. The active ethanol extract of Eucalyptus deglupta leaves may be used in mosquito control activities.
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