Abstract
The effect of cyromazine on reproduction, egg hatch and subsequent larval development in the housefly was studied by administering cyromazine in concentrations up to 1000ppm in adult drinking water. Larval survival was completely inhibited by the continupus feeding of 500 or 1000ppm cyromazine to newly emerged adults and the effect was exerted predominantly through female. When the cyromazine feeding was limited to the first four days after emergence, the inhibitory effect on larval development was observed only at the first gonotrophic cycle. In any combinations of the cyromazine treatment, the egg production, egg hatch, pupa formation and adult emergence were not affected.
