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American cockroach, Periplaneta americana L. is an obnoxious and filthy domestic pest of tropical countries of the world. Cockroaches are high priority urban pests because of their aesthetically unappealing damage stored products and household good and transmit diseases (Ebeling, 1978). It is a common pest of restaurants, bakeries, grocery stores etc. It has also been observed in the cargo holds libraries and dining rooms and occurs in latrines and sewers. P. americana carry filth and pathogens on their legs and body and contaminate food on contact. Among pathogenic diseases transmissible by roaches to man are enteric fever, dysentery and leprosy (Eads et al., 1954; Cornwell, 1968). Various control methods have been adopted to control this insect, such as chemical control with the use of selective insecticides, mechanical, biological and genetic control methods. Chemical insecticides are conventionally utilized for controlling cockroaches in most parts of the world. (Pal, 1994; Schofield, 1993).

Toxicity of diazinon and cypermethrin against the American cockroach, <i>Periplaneta americana</i> (L.)