Bioefficiency Test of Aerosol Insecticide Products against a Dengue Vector, Aedes Aegypti

Abstract

In 2019, 102,553 dengue cases were reported in Thailand, as of 16 October 2019. These incidence was 1.5 times higher than that reported during the same period in 2018. Insecticides is still the principal method to control dengue vectors, especially in dengue endemic areas. The use of personal protection tool such as household aerosol insecticides is essential in protecting and reducing discomfort caused by the bite of dengue vectors. Our team collected data on bioefficacy tests of aerosol insecticide products that were analyzed by a laboratory glass chamber method which was ISO/IEC 17025 certified. A total of 183 samples submitted by the insecticides manufacturers in Thailand in the last six years (2013-2018) were tested. There were 119 samples that passed the test criteria (65.02%) with 100% mortality of test mosquitoes, and most of them had KT50 values of 2-4 minutes. The majority of them contained pyrethroid as active ingredients which included imiprothrin, permethrin, prallethrin, cypermethrin, and d-tetramethrin. The collected data showed that there were 38 different formula. The mixed formulation of esbiothrin and permethrin was the most effective product against a laboratory strain of Aedes aegypti, with the fastest KT50 value of 1 minute 29 seconds. However, permethrin has been used to control mosquito populations for many years and resistance to this insecticide has been detected throughout Thailand. Therefore, this data are useful for the development of insecticide products to control insecticide resistant mosquitoes.