The field trial was carried out against Aedes albopictus adults using some insecticides in the garden of the two temples in Tokyo in the summer, 2010. Three kinds of water-based microemulsions, Permethrin at 5% (w/w), Phenothrin at 10% (w/w) and Etofenprox at 7% (w/w) were applied to the bushes and the ground surface at rate of 50 ml/m² in dilution of 1/50, with a power-driven sprayer, respectively. The effect was evaluated by three methods: the change in biting density by means of capture by the insect nets, the capture by light traps with dry ice and the mortalities of adults of laboratory colony inside cages placed in the bushes or on the ground surface. In the post-application course, furthermore, the side effect to goldfishes set in the same places and to some cultivated plants was observed. After the application on September 1st, the mosquito density drastically fell to zero and none of mosquitoes were captured for a few days. And the complete mortality of mosquitoes inside the cages was also achieved in a few hours. However, the capture began to recover in the phenothrin and etofenprox area after 4–5 days, while it did in the permethrin area after approx. 10 days. The difference of the recovery terms between two groups seemed to due to the size of area treated. And, the tendency of the recovery seemed rather moderate. The density didn't reach to the level prior to the application. Simultaneously the biting season was over. Based on the observation, it seemed if a treatment is applied on a large scale, the measure would be effectively practical to control adult vector mosquitoes urgently.