Toxicity of Cypermethrin and Chlorpyrifos Against German Cockroach [Blattella germanica (Blattaria: Blattellidae)] Strains from Hamadan, Iran

Mansour Nazari, Behrouz Alipourian Motlagh and Hassan Nasirian

Pakistan Journal of Biological Sciences 19 ( 6 ): 259 - 264 , 2016