Bio-Efficacy of Lavandula angustifolia (Lamiaceae) Against Culex quinquefasciatus Say (Diptera: Culicidae)

Deepalaksmi | Jeyabalan

Culex quinquefaciatus | LC50

Vol: 2; Iss: 4; Apr 16 | ISSN: 2454-5422

Photochemical have proven that they are potential mosquito control agents and also alternative synthetic insecticides. Different concentration of plant leaf extracts of Lavandula angustifolia were tested for their activity against different larval and pupal stages of Culex quinquefaciatus. The larval and pupal mortality decreased after the treatment of plant extracts. The result obtained indicates better activity. Hence this plant extracts can be suitable alternative to synthetic insecticides. Similar observation is registered for 1^st, 2^nd, 3^d and 4^th instar larval forms. When comparing between the solvents, it can be clearly seen that, methanol leaf extract exhibits higher mortality at low concentration, than petroleum ether and acetone. For instance, within the experimental level, the LC50 and LC90 values of Lavandula arvensis recorded 0.83 ppm and 3.07 ppm with acetone extract, 0.78 ppm and 2.80 ppm with petroleum ether extract, 0.70 ppm and 2.26 ppm with methanol leaf extract respectively. Hence it can be clearly seen that, methanol leaf extract exhibits highest mortality at low concentration (ppm), when compared to the plant and the solvents (petroleum ether and acetone).