Temephos Susceptible of Aedes aegypti In lower part of Northern, Thailand. 2008-2018

Abstract

The chemicals approach to control the Aedes Aegypti, vector of Dengue Hemorrhagic fever (DHF), is still one of the measures to prevention and control of DHF endermic. Temephos sand granules have been widely used as laviciding in Thailand. The resistance of larvae to the temephos many occur from exposing to dilution of the chemicals in the domestics-used water containers. During 2008–2018. Surveillance susceptibility level of larval mosquitoes to chemicals using WHO susceptibility kits were done in urban and rural areas of the lower part of Northern Thailand eg. Phitsanulok, Uttaradit, Sukhothai, Tak and Phetchaboon.

The results showed that there variations of susceptibility  among larval mosquitoes in urban and rural areas of the percentage mortality rate were 36-100. Urban area of the Aedes Aegypti larvae in Phitsanulok and Tak sensitive to the Temephos (the mortality rate of 80-100%). Additionally; 3 areas (Uttaradit, Sukhothai, and Phetchaboon) resisted to the chemicals clearly (the percentage mortality rate of 58-74%). Rural area of the Aedes Aegypti larvae in

             Sukhothai, Phitsanulok and Tak sensitive to the Temephos (the mortality rate of 82-100%). Additionally; 2 areas (Uttaradit, and Phetchaboon) resisted to the Temephos clearly (the percentage mortality rate of 36-65%). This can be concluded that Aedes aegypti larvae in Uttaradit province and Phetchaboon province mostly resisted to the Temephos in controlling dengue fever. Therefore, controlling mosquito larvae in these province should be strictly used the Temephos up to standardize recommendation by the WHO, or 1 gram per 10 liters of water. Moreover; it should be combined with the other methods.