followed by environmental management to deprive the insects of food and shelter. The German cockroach is resistant to several organochlorine, organophosphorus, carbamate and pyrethroid insecticides5. In comparison to residual sprays against cockroaches, aerosol has been found more effective6. The aerosols have a better reach in the cracks and crevices, the usual harbourages for cockroaches than other spraying techniques.