The biorational design of new miticides requires an understanding of the biochemistry and physiology of mites. This review considers the interaction and impact of existing miticides with the cuticle, nervous system, growth and development, metabolism, feeding and behaviour and assesses the potential of these as possible targets for miticide development. Considering the sites of action of some of the major miticides, GABAergic and octopaminergic transmission, and oxidative phosphorylation are attractive targets for further miticide development.