Use and effectiveness of commercial Hit-spray insecticides in control of mosquito population in Sagamu, Southwest Nigeria

Abstract

Introduction: Control of mosquito vector is crucial to reducing the burden of malaria in endemic region. In the present study, we investigated the use of commercial insecticides in families and their effectiveness in control of mosquito population in Sagamu, southwest Nigeria. Materials and methods: A pretested structured questionnaire was used to determine mosquito adulticides techniques employed in the community and most commonly used adulticides were evaluated for effectiveness by exposing adult mosquitoes to varying concentrations of the insecticides and responses monitored. Results: Families differ in methods adopted to prevent mosquito and use of flit-spiny insecticide was commoner. Although parents constitute 64% of those applying the insecticide, 22.2% were children. Household pyrethroid insecticide products of Baygon® (Imiprothrin, Prallethrin plus Cyfluthrin), Mobil® (Neopynamin, Prallethrin plus Cyphenothrin) and Raid®(Pynamin forte, Neopynamin plus Deltimethrin) were three commonly used in the community. The exposure tie interval for eath of mosquitoes was shorter with Raid® (100% at 8 minutes) when compared with Mobil (80%») and Baygon (85%) at 10 minutes (p= 0.005). Kaplan-Meier survival curve of cumulative probability of surviving exposure to insecticide was lowest with Raid®(log rank 2 = 14.56, P= 0.001). Conclusion: Although Hit-spray insecticides are affordable with simple application tool, inexplicit use-instruction on labels may cause discrepancies in application. Monitoring responses of mosquitoes to commercial flit-spray insecticide may support effective control technique and prevention of vector resistance in poor resource communities