S. The evaluation of piretroid insecticide (active ingredient Malation 95%) was conducted in Sub district Tengarang, Semarang Segency, Central Java Province. The insecticide was applied using thermal fogging method for dosages of 125, 250, 375, 500 and 625 ml/ha (diluted in diesel to 10 litters). The evaluation of the efficacy was conducted against two mosquito species, Aedes aegypti (the main dengue haemorrhagic fever) and Culex quinquefasciatus (the urban lymphatic filariasis vector). Result of the evaluation was revealed that dosages of 500 and 625 ml/ha were effective against both tested mosquito species indoor and outdoor.