Susceptibility test of Aedesaegypti larvae to Temephos, In Udonthani province

Abstract

Prevention and Control of Dengue fever focused on Aedesaegypti larvae, especially controlling at the breeding sites. For example household water storage containers such as   the jars, the tanks in bathroom, the pantry saucers, the vases and the other used and non-used containers. The control technique can be performed by physical, biological and chemical method. The suitable chemical recommended by the World Health Organization to control mosquito larvae nowadays is Temephos. Concentration of 1 ppm ( part per million) are safe for animal feeding, can be put in the drinking water. The Ministry of Public Health has recommended the Temephos in the control of the disease since 2515. It has been produced a variety of forms and sizes concentrations. We need to determine the susceptibility of Aedesaegypti larvae to this chemical periodically so as to be sure of it’s used for the controlling performance. The purpose of this study was conducted  In order to know the susceptibility of Aedesaegypti larvae to the chemical at the concentration of 0.02 mg / l, which recommended method  by the World Health Organization.  This study had been conducted between April - June 2557.

The results showed that non area of the Aedes  larvae in UdonThani sensitive to the Temephos (the percentage mortality rate of 98-100). Additionally;  3 areas of Aedes larvae began to resist to the Temephos (the percentage mortality rate of 80 –97) and 17 areas resisted to  the chemicals clearly (the percentage mortality rate  <80). This can be  concluded that Aedesaegypti larvae in this province mostly resisted to this chemicals in controlling dengue fever. Therefore, controlling mosquito larvae in this province effectively should be urged all sectors to use this chemical up to the standards recommended by the World Health Organization, thus 1gram per 10liters of water should be performed accordingly. Moreover; it should be combined with the other methods.