The presence of flies is always an indicator of a proofing defect and possibly a hygiene problem. Flykillers can be sited to catch insects that have breached barrier methods employed, but they should not be used as the first line in defence against flies. Killing adult flies may reduce the infestation, but elimination of breeding areas is necessary for good management.
Dustbins should have tight-fitting lids and be cleaned regularly. Rubbish and recyclable materials should be placed in plastic bags and sealed. All rubbish receptacles should be located as far from building entrances as possible. Insecticidal spray treatment should only be employed to alighting surfaces, door and window frames but no surface coming into contact with food. Treat bin areas with a residual insecticide after cleaning. Fly traps may be useful if enough traps are used and placed correctly.