Interaction between bacterial and chemical larvicides used in mosquito control

The bacterial larvicdis "Bacillus thuringiensis H-14 and Bacillus sphaericus 15934" were biologically assayed against the 3rd instar Culex pipiens larvicide, with each other or with the conventional chemical larvicide "dieldrin". A results indicated that the larval mortality occurred when these larnicides were used simultaneously or in sequences, were found to be higher than that achieved when these preparations were used separately. So it may be assumed that, it is preferable to use these bacterial larnicides in integration with the chemical one in mosquito larval control programmes, instead of using each of them alone