followed by environmental management to deprive the insects of food and shelter4. The Ger- man 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.