Field tests of Bacillus Thuringiensis Var, Israelensis against Culex Mosquito Larvae in Dhaka City

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.


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