Besides, it has been reported as the continuous use of
synthetic insecticides caused insect pests and vectors
to develop resistance in due course of time, it is often
more economical to use synergists. This synergistic
mixture can be incorporated into mosquito control
programmes as well, so as to avoid indiscriminate use
of neem in blanket sprays. Such strategies will minimise
the problem of induction of resistance in the
pest population and will apparently continue to render
the extracts ‘effective’ for many years as pest control
agents.