effect of triflumuron and pyriproxyfen on musca domestica l larval stages in the laboratory

background:  the residual effect of triflumuron and pyriproxyfen on musca domestica l larval stages was studied in the laboratory. methods : 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 1 st , 2 nd and 3 rd instars m.domestica larvae. results: both igrs inhibit m. domestica adult emergence of 98-98.5% when applied at the lowest concentration of 0.5 mg/l on the 1 st instar, 93-97% of adult emergence inhibition on the 2 nd instar,and 91-97% of adult emergence inhibi­tion on the 3 rd instar larvae respectively. there was no significant difference between triflumuron and pyriproxy­fen on house­fly adult emergence inhibition when fed to the 1 st , 2 nd and 3 rd instars m.domestica larvae ( p> 0.05). however, there was a significant difference between the igrs and the control ( p< 0.05). conclusion : 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.