~ 1043 ~ Journal of Entomology and Zoology Studies 2018; 6(2): 1043-1046 E-ISSN: 2320-7078 P-ISSN: 2349-6800 JEZS 2018; 6(2): 1043-1046 © 2018 JEZS Received: 15-01-2018 Accepted: 16-02-2018 Seyed Mohsen Mohebbi Nodez Infectious and Tropical Diseases Research Center, Hormozgan Health Institute, Hormozgan University of Medical Sciences, Bandar Abbas, Iran Azam Rafatpanah Zoonoses Research Center, Jahrom University of Medical Sciences, Jahrom, Iran Mousa Khosravani Department of Medical Entomology, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran Fatemeh Shahidi Hakak Department of Medical Entomology, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran Azim Paksa Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Correspondence Mousa Khosravani Department of Medical Entomology, School of Health, Shiraz University of Medical Sciences, Shiraz, Iran Susceptibility status of German cockroaches, Blattella germanica (L.) to carbamate and pyrethroid insecticides within surface contact method in Shiraz city, Iran Seyed Mohsen Mohebbi Nodez, Azam Rafatpanah, Mousa Khosravani, Fatemeh Shahidi Hakak and Azim Paksa Abstract German cockroaches (Blattella germanica) is one of the most important pests that have extensively pervaded into human dwellings and hospitals. Two class of insecticides named carbamate and pyrethroids were examined on two strains of cockroaches (dormitory (D) and hospital (H)) through the surface contact method. The obtained lethal doses of Carbaryl (WP 85%) were much higher than the standard dose for both strains. In the case of cyfluthrin WP 10%, the fatal doses were extracted 2.765 and 3.265 mg/m 2 for D and H strains whereas the suggested dose was 3.768 mg/m 2 . The toxicity dosages of Lambdacyhalothrin (WP 10%) were 1.413 and 3.265 mg/m 2 for D and H strains respectively. Both strains have exhibited the tolerance to them. H and D strains were tolerant to pyrethroids. Notably, pyrethroids should be rotationally used with others insecticides relaying to integrated pest management (IPM). Keywords: German cockroach, surface contact, pyrethroid, carbamate, Iran 1. Introduction Blattella germanica (German Cockroach) as a detrimental pest that damages food materials in human dwellings [1] . Further, they can adapt to the environment with poor nutritional resources thereby, they suppose as opportunist pest [2] . Cockroaches order comprise over 400 species that widespread throughout the world. Moreover, 18 genera of this insects are accounted as domesticated pests (synanthrope) [3] . They serve as a mechanical vector of a variety of pathogens and cause asthma or allergic interaction in human [4, 5] . The cockroach has a history going back to the 360 million years ago nearly [6] . In addition to, bacterial agents (e.g. Klebsiella spp. and Pseudomonas) have been isolated from hospital cockroaches and patients, therefore, they have potentially the medical importance [7] . Also, they harbored numerous species of intestinal parasites and viruses. Some predominant biological agents have been identified as protozoan microorganisms (Entamoeba histolytica), helminths (Trichuris trichiura), viruses (densovirus) and several fungal parasites (Aspergillus spp.) [8, 9, 10] . Although the role of cockroaches in the transmission of agents to human is not clear, they can be considered as the carrier of microorganisms associated with nosocomial and bacterial infections [3] . For this reason, combat cockroach is critical for man and application of chemical insecticides have expanded against these annoying pests. On the other hand, resistance to pesticides is a negative phenomenon due to using a wide range of chemical insecticide. Some of the strains have shown resistance to up to 8-12 insecticide [11, 12] . For instance, diazinon altered with propoxur in control interventions at the end of the 1960s [13] . German cockroach has demonstrated resistance to some insecticides such as diazinon (organophosphate), permethrin (pyrethroids) and bendiocarb (carbamate) in Iran [14] . One strain of cockroaches was shown tolerance to propoxur in a study conducted by Ladonni et al [15] . Continuously, many of researchers carried out the surveys on the resistance process in order to reduce the emergence of resistance [11] . Our project aims the evaluation of susceptibility level of two class of insecticides (i.e. carbamates and pyrethroids) in the student’ dormitories and hospitals of Shiraz University of medical sciences. This results can be used for control of cockroach especially in crowded places that many people live together in