In southern Iran, adults of Anopheles stephensi, the main vector of malaria, are resistant to DDT, dieldrin and malathion. Susceptibility tests carried out with propoxur-impregnated papers during 1976-86 in 5 villages in Minab County, showed that, despite 10 years of propoxur application twice a year in dwellings, An. stephensi remained susceptible to this insecticide.