RESUMO
Accumulations of large quantities of wastes [manure, used litter, dead birds] which are excellent medium for fly-larvae over poultry houses provide breeding places for different groups of fly pests, with house-flies being the dominant species. This project is a comparative lab study. In this research project the larvicidal effects of cyromazine and triflumuron were studied as two Insect Growth Regulators [IGRs] to reduce the fly population using oral application. Both IGRs had a significant effect on larval mortality compared with their controls among the concentrations [P< 0.01, Fisher's LSD with Bonfferoni correction] including a dose-dependent relationship. Comparisons among LC[50] and LC[90] values, using fiducial limits, showed that cyromazine was significantly more toxic to the larvae of the two strains than triflumuron. It is concluded that cyromazine should be used in a larvicidal programme to control house-fly rather than triflumuron