Microbial larvicide, Mosquito control, Kumasi, Ghana Background

Extensive use of chemical insecticides against vector mosquitoes, for the control of malaria and other mosquito borne diseases, for about four decades, has caused devel-opment of resistance in vector mosquitoes to these insec-ticides and hazards to the environment [1-5]. In spite of the sustained and prolonged use of chemical insecticides, these diseases are not only still prevalent but also cause epidemics [2]. Research undertaken to reduce malaria incidence in Ghana and Kumasi in particular, have, over the years focused mainly on the adult vectors. Therefore, to minimize the dependency on chemical insecticides, there is an urgent need to explore alterna-tive measures for the control of vector mosquitoes. The advantages of Bacillus thuringiensis var israelensis (Bti) in comparison to chemical control is its effectiveness at relatively low doses, safety to humans and non-targe