OVIPOSITION AND OVICIDAL ACTIVITIES OF ALKALOIDAL EXTRACT FROM MURRAYA KOENIGII AGAINST VECTOR MOSQUITOES

Abstract

Alkaloidal extract from Murraya koenigii have shown oviposition activity at 250-1000 ppm concentration and ovicidal activity at 25-100 ppm concentration against Culex quinquefasciatus and Culex tritaeniorhynchus. Water treated with alkaloidal extract at 1000ppm received significantly more egg rafts of vector mosquitoes than lesser concentrations of alkaloidal extract and filtered cesspit water (control). The maximum Oviposition Active Index of 0.93 was observed at 1000ppm in Cx.quinquefasciatus. Laboratory treatment of the eggs of various age groups in different concentration of alkaloidal extract caused only moderate ovicidal activity but inflict delayed effects such as high larval and low pupal and adult mortality. The eggs of Cx.quinquefasciatus were found to be more susceptible than Cx.tritaeniorhynchus. The age of the egg rafts, concentration of alkaloidal extract and the duration of treatment also influenced the ovicidal activity.


Key Words: Murraya koenigii; Rutaceae; alkaloidal extract; oviposition; ovicidal; Culex quinquefasciatus; Culex tritaeniorhynchus.


Nigerian Journal of Natural Products and Medicine Vol.7 2003: 16-19