• Dr. S. Premalatha

The diseases transmitted by mosquitos’ remains a major cause of the loss of human life worldwide with more than 700 million people suffering from these diseases annually. Apart from being a great source of medicine, the plants play an excellent role in various fields including insecticides. The present study, larvicidal activity of different solvent extracts[petroleum ether, hexane, chloroform, ethanol and water from asteraceae family plants -Tridax procumbens, Synendrella nodiflora, Blumea sinuate and Ageratum conzoides were against larvae-Aedes aegypti at various concentrations (control, 25%, 50%, 75% and 100%) and time period includes 24hrs and 48hrs to observe the mortality rate. As the exposure time increased the mortality rate also increased this shows that the crude extracts slowly affects the larvae. All the plant extracts showed larval mortality sequentially increased from lower concentration (25%) and achieved maximum activity at 100% concentration. By comparing the extraction, the chloroform shows a high mortality percentage against Aedes aegyptii. The least concentration of mortality was obtained in Hexane and aqueous extraction at 1.25% and 0.625% concentration. Comparing with all other crude leaf extracts the chloroform extract of Tridax procumbens show higher mortality rate, at 5% concentrations gives 100% mortality (LC 50 -0.70 ; LC 90 – 1.56).The current study shows that the Asteraceae family plants can be used as larvicidal agents among which Tridax procumbens is a good source for mosquito control.

Asteraceae, Mosquito control, Larvicidal activity, Aedes aegyptii

"BIO-EVALUATION OF LARVICIDAL ACTIVITY OF FOUR MEDICINALLY IMPORTANT PLANTS OF THE FAMILY ASTERACEAE AGAINST THE LARVAE OF AEDES AEGYPTI", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.10, Issue 9, page no.b272-b281, September-2023, Available :http://www.jetir.org/papers/JETIR2309130.pdf

"BIO-EVALUATION OF LARVICIDAL ACTIVITY OF FOUR MEDICINALLY IMPORTANT PLANTS OF THE FAMILY ASTERACEAE AGAINST THE LARVAE OF AEDES AEGYPTI", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.10, Issue 9, page no. ppb272-b281, September-2023, Available at : http://www.jetir.org/papers/JETIR2309130.pdf