Most strains of B. thuringiensis produce delta-endotoxin crystals toxic to lepidopteran and dipteran insects. Recently, however several researches have shown that B. thuringiensis is also widely distributed in natural soils of various area and Mulberry leaves. In the present study I found the unique strains, Bacillus thuringiensis serovar entomocidus INA288 and serovar aizawai Bun 1-14 as Mosquitocidal insecticide, both of which were isolated in Indonesia.