%0 Journal Article
%T Toxicity of Pyrethroid and Organophosphorous Insecticides against Two Field Collected Strains of the German Cockroach Blattella germanica (Blattaria: Blattellidae) from Hospitals in Hamadan, Iran
%A Mojtaba Limoee
%A Behroz Davari
%A Seyed Hassan Moosa-Kazemi
%J Journal of Arthropod-Borne Diseases
%D 2012
%I Tehran University of Medical Sciences
%X Background: The German cockroach, Blattella germanica is a major hygienic pest and mechanical vector for pathogenicagents in hospitals and residential areas. The development of insecticide resistance is a serious problem incontrolling of this pest. Toxicity of four commonly used insecticides (permethrin, cypermethrin, malathion andchlorpyrifos) against two hospital- collected strains of the German cockroach was investigated.Methods: Topical bioassay methods were carried out for detecting insecticide susceptibility of adult male cockroaches.For each insecticide, four to six concentrations resulting in >0% and <100% mortality were used. Three tosix replicates of 10 cockroaches per concentration were conducted. The differences between LD50 (¦Ìg/g) values wereconsidered statistically significant only when the 95% confidence intervals did not overlap.Results: Two hospital- collected strains of the German cockroach showed low to moderate levels of resistance tochlorpyrifos, permethrin, malathion and cypermethrin based on resistance ratios compared with susceptible strain.Conclusion: The low level chlorpyrifos resistance suggesting this insecticide may still provide adequate control ofthese strains. While the obsereved moderate levels of resistance to cypermethrin could imply developing resistanceto this compound.
%K Insecticide resistance
%K Pyrethroid
%K Organophosphate
%K German cockroach
%U http://jad.tums.ac.ir/index.php/jad/article/view/173