Rubbish is shown being collected from the street and taken to a refuse tip. The rubbish is pushed into place by a tractor and then sprayed with insecticide. The refuse is then crushed and covered with a tight layer of soil to prevent any flies hatching and emerging. Control measures to be used inside buildings are discussed. Various insecticide sprayers manufactured by Coopers are shown, from hand-held sprays to large ones that are wheeled around. The insecticide is safe to use around food, and is shown being sprayed in slaughterhouses, canneries, shops and catering establishments. The Cooper testing labs are shown. A small chamber is filled with flies and insecticides to test how well the spray works. A large test room is also shown. Aerosol is sprayed and then flies are released into the room. The flies are collected from the floor at the end of the test.