Tehran University of Medical Sciences Journal of Arthropod-Borne Diseases 2322-1984 2 1 2008 06 15 21 27 EN M Shahi School of Public Health, Hormozgan University of Medical Sciences, Bandar Abbas, Iran AA Hanafi-Bojd Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran H Vatandoost Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran 2015 10 03 Background: The German cockroach, Blattella germanica L., is a serious household and public health pest worldwide. Con­trol of this species has been very difficult to achieve. Toxicity of cypermethrin EC10%, deltamethrin EC5%, diazi­non EC0.5%, lambda-cyhalothrin EC5% and Negon® (permethrin+propoxur oil liquid1%) commercial for­mula­tions were investigated against adult males of German cockroaches collected from four hospitals of Bandar Abbas City, southern Iran, during 2006. These insecticides have been used for cockroach con­trol in this city. Methods: The tests were carried out only on males by the glass jar contact method recommended by the WHO. Results: Maximum mortality rates of 20, 35, 90, and 100% were obtained after one hour contact to label-recom­mended doses of cypermethrin, deltamethrin, lambad-cyhalothrin, diazinon and permethrin+propoxur insecti­cides, respectively. KT50 results were different from 5.68 min for permethrin+propoxur mixture to 240.37 min for cyper­methrin. German cockroach showed < 80 per cent mortality using three pyrethroid insecticides. Conclusion: It seems that the label-recommended concentrations of these insecticides were wrong and lower than WHO advised for cockroach control. For monitoring of resistance it is recommended to do more tests using the pure ac­tive ingredient of these insecticides. https://jad.tums.ac.ir/index.php/jad/article/view/23 https://jad.tums.ac.ir/index.php/jad/article/download/23/21