Abstract

Objective: To evaluate the efficacy of deltamethrin and find a relation between persistence andresidue of this insecticide on the prevalent surfaces against malaria vectors in southeastern Iran. Methods: After indoor residual spraying on prevalent surfaces in studied areas (plaster and mudas absorbent surfaces, wood as non absorbent surface and filter paper as control) for malaria control, conical tests as a bioassay method and chromatographic method as an analytical methodwere used for evolution of persistence and residue of deltamethrin insecticide. Results were investigated statistically by ANOVA and Tukey-HSD tests for determining relations or differences between residue and persistence of deltamethrin. Results: According to the results, there wasno significant difference between mortality rates from bioassay tests on different surfaces, anddeltamethrin kept its utility to malaria vector control until 120 days after indoor residual spraying on these surfaces. In the case of residue, there was no significant relation between residueamounts and mortality rates on different surfaces, whereas this relation existed between residualamounts on filter papers and mortality rates from bioassay tests. Conclusions: This studyshows that measurement of residue in filter papers is a suitable tool for evolution and dictum ofefficiency of deltamethrin insecticide in indoor residual spraying for malaria control.