The sensitivity of Aedes aegypti larvae to the concentration of Temephos 0.02% Loei and Nongbualumphu Province, 2014

Abstract

The purpose of this study was conducted in order to know the susceptibility of Ae. aegypti larvae to the Temephos at concentration of 0.02 mg / l, by  the World Health Organization recommended method.  This study had been conducted between April - July 2014. The mosquito larvae were collected purposively from 14 villages in Loei Province and 6 villages in Nongbualumphu Province or totally of 20 villages.  The 125 mosquito larvae at stage 3 (end stage) or stage 4 (early stage) were collected from each village.  100 larvae had been used as testing sample to the substance, while 25 larvae had been used as controlling sample according to the World Health Organization recommendation. The results shown that the sensitivity at a high level of the mosquito larvae to the substance was not detected in  Loei Province, but moderately levels (80.00-93.00 %) were  demonstrated  in 8 districts, namely; Phuruea , Thali , Phakhao , Nonghin, Nahaeo, Chiangkhan, Dansai and Naduang.  Moreover; lower level (69.00 – 78.00%) were found in 6 districts, namely; Phukradueng, Phuluang, Pakchom, Arawan, wungsapung and Muangloei. Similarly results were found at Nongbualumphu Province, nothing declared at high level, but  moderately level (80.00-93.00 %) had been found in  2 districts namely; Nawung and Naklang.   Moreover; lower level (69.00 – 78.00%) were found in 4 districts, namely; Muangnongbualumphu, Nonsung, Sibunrueang and Suwannakhuha. This can be concluded that the Aaegypti larvae in both of this province were mostly resisted to this chemical or half of the districts in each province were detected similarly at moderate and lower level accordingly.

Therefore, controlling mosquito larvae in these province should be strictly used the chemical up to standardize recommendation by the World Health Organization, or  1 gram per 10 liters of water. Moreover; it should be combined with the other methods.