• Karthick, R
• Jeyabalan, D.
• Mohanakrishnan

Mosquitoes are the most important single group of insects in terms of public health. Mosquitoes-borne disease is endemic in more than 100 countries, causing mortality of nearly two million people every year. Who has been declared mosquitoes are serious human disease causing insects which transmit many dreadful diseases. Culex quinquefasciatus more commonly called the southern house mosquito is the principal vector of lymphatic filariasis caused by Wuchereria bancrofti and a potential vector of Dirofilariaimmitis. Larviciding is a successful way of reducing mosquito densities in their breeding places before they emerge into adults. The wide use of conventional chemical insecticides, such as Malathion and DDT, against adult mosquitoes has shown promising results in combating the spread of mosquitoes. Phytochemical are widely used as biocontrol agent against vector mosquitoes. Present study was undertaken to evaluate the mosquitocidal activity of Geranium oil against Culex quinquefasciatus. This study was conducted in the laboratory to evaluate the Geranium oil with different concentration (1% and 2%). The mosquitocidal activity was recorded of 24 hours, under laboratory condition 98% larval mortality was observed in 1st instar of Culex quinquefasciatus, after the treatment of Geranium oil at 2% concentration; where as in 3rd and 4th instar larval mortality were 94% and 90% at 2% treatment respectively. The pupal mortality was 81% at 2% oil treatment. Adult mortality was 64% after the treatment; the adult emergence was drastically reduced after the treatment of Geranium oil. The larval duration was greatly extended up to 4 days after the treatment of Geranium oil (2%) than other concentration. Pupal duration also extended after the treatment of Geranium oil than control. Fecundity and egg hatchability also reduced after the treatment of Geranium oil 37%. Ovipositional deterrency was observed after the treatment of plant extract at 2%. Adult repellency was 67% after the treatment of Geranium oil and biting deterrency also increased after the treatment of oil (1% < 2% < 4%). Larval pupal intermediate were very high after the treatment of Geranium oil.

Culex quinquefasciatus, geranium oil, larvicide, pupicide, adulticide, pupal duration, adult duration

"STUDIES ON MOSQUITOCIDAL ACTIVITY OF GERANIUM OIL (PELARGONIUM GRAVEOLENS) AGAINST CULEX QUINQUEFASCIATUS SAY (DIPTERA: CULICIDAE)", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 2, page no.a487-a494, February-2022, Available :http://www.jetir.org/papers/JETIR2202063.pdf

"STUDIES ON MOSQUITOCIDAL ACTIVITY OF GERANIUM OIL (PELARGONIUM GRAVEOLENS) AGAINST CULEX QUINQUEFASCIATUS SAY (DIPTERA: CULICIDAE)", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 2, page no. ppa487-a494, February-2022, Available at : http://www.jetir.org/papers/JETIR2202063.pdf