Since the opening of the British Mosquito Control Institute, in August 1925, the mosquito control of Hayling Island (initiated in August 1920) has been carried on as part of the research work of the Institute's laboratory.

This work involves the routine examination of the different water-places of the Island throughout the year by an inspector who brings to the laboratory all specimens of mosquito larvae, etc., thus collected. These specimens are identified, recorded in the daily register and finally utilized in various ways ; the larvae remaining in the water-places being subsequently destroyed by appropriate means. The inspector's working year is therefore made up of “ collecting days ” and “ anti-larval days ” ; the time devoted to these two departments of the work being approximately the same.