Resistance Status of Aedes aegypti to Insecticides in the Jazan Region of Saudi Arabia

Abstract

The present study was designed to provide information on the susceptibility status of the adult and larvae of Aedes aegypti mosquitoes in Jazan region of Saudi Arabia. Bioassay tests were performed on adults and larvae by using WHO recommended concentrations and test kits. Adults of Ae. aegypti mosquitoes were exposed to test papers impregnated with Lambda-cyhalothrin (0.05%), Cyfluthrin (0.15%), Deltamethrin (0.05%), Permethrin (0.75%), Fenitrothion (1%), Bendiocarb (0.1%) and DDT (4%) insecticides. Ae. aegypti mosquitoes were found to be susceptible only to Cyfluthrin; (mortality rate was 100 %), whereas variable resistances were observed from the rest of the other insecticides tested (mortality rates ranged between 93.6 and 17%). Larvae were subjected to different concentrations of Diflubenzuron, Methoprene (IGRs) and Temephos (Organophosphate). The inhibition of adult emergence (IE 50 and IE 95 ) values for the IGRs and the (LC 50 and LC 95 ) for Temephos have been determined by log-probit regression analysis. The Ae.aegypti larvae were resistant to Temephos (LC 50 61.8 -LC 95 35600.1 mg/l) and showed high susceptibility to Methoprene than Diflubenzuron (IE 50 0.49 -IE 95 10.9 mg/ l) and (IE 50 0.86 and IE 95 93.8 mg/l), respectively. The larvae were more susceptible to Methoprene than Diflubenzuron by 1.8 folds.