Susceptibility and Resistance of Mosquitoes to Selected Insecticides used in Minna Niger State, Nigeria

Abstract

Mosquitoes harbour and transmit disease causing organisms which are a menace to man and animals. The use of insecticides for the control of mosquitoes continues to be resistance prone. The susceptibility and resistance of Culex mosquito to low and high concentrations of lambda-cyhalothrin and dichlovos insecticides commonly used in Minna, Niger State Nigeria were determined using WHO standard procedure. The result shows that susceptibility varied with concentration and between the two insecticides after one hour exposure time. At the low concentrations mortality was 52.63 ± 5.42 % and 66.66 ± 3.83 % lambda-cyhalothrin (0.40 %) and dichlovos (3.00 %) respectively while 98.48 ± 1.51 % and 98.67 ± 1.33 % were recorded for the high concentrations of lambda-cyhalothrin (0.7 %) and dichlovos (7.0 %) respectively. Also control was 4.00 %. After twenty-four hours of exposure; 87.74 ± 2.65 % and 84.06 ± 3.83 % percentage mortality were recorded for the lower concentrations and 100 % for the higher concentrations of lambda-cyhalothrin and dichlovos insecticides respectively; control was 8.33 %. It is therefore concluded that at high concentration Culex mosquito was susceptible to the selected insecticides after twenty four hour of exposure.