ABSTRACT
The residual effect of triflumuron and pyriproxyfen on Musca domestica L larval stages was studied in the laboratory. Both IGRs at varying concentrations ranging between 0.5 to 2.5 mg/L were placed inside beakers with mice chow and vitamin B complex and water as food for the 1st, 2nd and 3rd instars M.domestica larvae. Both IGRs inhibit M. domestica adult emergence of 98-98.5% when applied at the lowest concentration of 0.5 mg/L on the 1st instar, 93-97% of adult emergence inhibition on the 2nd instar, and 91-97% of adult emergence inhibition on the 3rd instar larvae respectively. There was no significant difference between triflumuron and pyriproxyfen on housefly adult emergence inhibition when fed to the 1st, 2nd and 3rd instars M.domestica larvae [P> 0.05]. However, there was a significant difference between the IGRs and the control [P< 0.05]. Both triflumuron and pyriproxyfen are effective in inhibiting adult emergence of housefly M domestica and therefore should be recommended for fly control particularly in chicken farms and dumping grounds in Malaysia for housefly control activities