Tehran University of Medical Sciences Journal of Arthropod-Borne Diseases 2322-1984 14 2 2020 07 01 1317 1317 Sahar Hassandoust Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Seyed Hassan Moosa-Kazemi Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Hassan Vatandoost Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran AND Department of Chemical Pollutants and Pesticide, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran Mohammad Mehdi Sedaghat Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Kamran Akbarzadeh Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran 2020 07 01 Background: Southern part of the country is a high risk for mosquito transmitted Arboviruses. This study was car­ried out to determine the base line susceptibility of the Aedini mosquitoes to the WHO-recommended insecticide. Methods: Larval collection was carried out by dipping method and adult collection occurred by suction tube from January to December 2017. The adult susceptibility test was assessed to Bendiocarb 0.1%, DDT 4%, Deltamethrin 0.05%, Lambda-cyhalothrin 0.05%, Malathion 5% and, Permethrin 0.75% at different interval times as well as at discriminative dose recommended by WHO. The larval susceptibility test was occurred using Temephos and Bacil­lus thuringiensis serotype H-14, at different concentrations. The LT50, LT90 and LC50, LC90 values were calculated for plotting the regression line using Microsoft office Excel software ver. 2007. Results: Aedes caspius was quite resistant to DDT, Malathion, Bendiocarb and showed susceptible or tolerant to other insecticides.The LT50 and LT90 values to DDT in this species were 157.896, and 301.006 minutes, respective­ly. The LC50 and LC90 values of Ae. caspius to Temephos were 0.000068, and 0.000130ppm, the figures for B. thu­ringiensis was 111.62 and 210.2ppm, respectively. Conclusion: A routine and continuous study for monitoring and evaluation of different species of Aedes to insec­tides is recommend at different parts of country for decision making. https://jad.tums.ac.ir/index.php/jad/article/view/1317 https://jad.tums.ac.ir/index.php/jad/article/download/1317/501