Comparative evaluation of some commercial spray-applied insecticides as control method against Blatta orientalis

Cockroaches are globally distributed pests with high epidemic importance. Their role as spreaders of many infectious and parasitic diseases in animals and humans determines disinsection as the main antiepidemic measure. The present study compared the effectiveness of spray application of different commercial insecticides against a field population of oriental cockroaches (B. orientalis) under laboratory conditions. A very high efficiency of fipronil (100% mortality) was found as early as 37-48 hours after treatment and a high efficiency of synthetic pyrethroids - 95-97% mortality at 49-60 hours. With the organophosphate derivatives (Dichlorvos) low mortality (37%) and unsatisfactory efficiency was achieved. The obtained results confirm the insecticides from the phenylpyrazole group and the synthetic pyrethroids, in spray-applied forms, as an effective method of fighting the oriental cockroach.