Efficacy of Bacteria larvae in drains and ditches of Dhaka City was evaluated. At a dose of Il/ha and 2 I/ha could not complete reduction. But at a dose of 31/ha gave complete reduction one day po~t-treatn1tmt in both drains and ditches. But its r~sidual action did not last long. Redultion was noticed in early instar larvae more prominently than late in tars. Weekly treatment with this bacteria on the breeding !>ites can take care of the mosquito problem in Dhaka city.