trial of Bacillus thuringiensis H-14 for mosquito control

Bacillus thuringiensis H-14 was tried to see its efficacy as a larvicide. It showed good initial toxicity but no residual effect. After 36 to 48 hours it did not kill the larvae and is therefore not recommended as a larvicide against mosquitoes for a country like ours unless further research is conducted to create a monomolecular layer on water surface for retaining the bacilli on the surface or else if some new strain is developed which has got longer residual effect