Larvicidal Efficacy of Azadirachta indica, Ocimum gratissimum and Cymbopogon citratus Ethanolic Extracts against Culex quinquefasciatus Larvae

Background: Effective and repeated control use of synthetic insecticides has led to the development resistance in mosquitoes. This problem resulted need for new strategies selective mosquito larval control. The present work investigated larvicidal efficacy Azadirachta indica, Ocimum gratissimum, Cymbopogon citratus ethanolic extracts against Culex quinquefasciatus Methods: Extracts A. O. C. were obtained using 80% ethanol after their leaves had been previously air-dried about 3-4 weeks. Thereafter, solvent was evaporated with a rota-ry evaporator eliminate any solvents still present. Twenty-five samples (in four replicates) 2nd-3rd in-star larvae exposed various concentrations (20 mg/L, 40 60 80 100 mg/L) each leaf WHO standard procedures. Data analyzed Statistical Package Social Sciences (SPSS) Windows, version 14, statistical differences among mortalities induced by different Analysis Variance (ANOVA) at 95% confidence level (P= 0.05) aid GraphPad prism 8. Results: There an increase mortality rates as concentration three increased over 24 hours. Eighty mg/L extract indica gave rate 96.10% (24±0.1) hours exposure, same 100% (25.0. ±0.0) which is significantly (P < higher than 96.1% 80.0 % (20.0±0.5) conditions gratissimum respectively. 51% (12.5±0.7) However, least motility exposure 24-hour duration exposure. Conclusion: study concluded that most active, followed then gratissimum. citratus, hold great potential, they are important tools can be integrated into vector programme