Bacillus thuringiensis israelensis

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Bacillus thuringiensis serovar israelensis (Bti) is a group of bacteria used as biological control agents for larvae of certain Dipterans. Bti produces toxins which are effective in killing various species of mosquitoes and blackflies, while having almost no effect on other organisms. Indeed this is one of the major advantages of B. thuringiensis products in general - they have very few, if any, non-target effects.

Bti strains possess the pBtoxis plasmid which encodes numerous Cry and Cyt toxins, including Cry4, Cry10, Cry11, Cyt1 and Cyt2. The crystal aggregation which these toxins form contains at least four major toxic components but the extent to which each Cry and Cyt protein is represented is not known and likely to vary with strain and formulation.

Commercial formulations include "Mosquito Dunks"/"Mosquito Bits." It is also available in bulk liquid or granular formulations for commercial and public agency use.