Flying insects that breed in drains or wet areas often share their habitat with pathogens such as listeria and salmonella. These are then transferred by the adults to any surface they land on. This is critical in a food preparation area.
Identification is important so that the root cause of the infestation is correctly determined and a plan for their control is formulated.
Flyscreen doors and windows can be used to exclude insects and ultraviolet fly units should be used to monitor populations. Most fly control need not involve the use of insecticides but after vigorous investigation, environmental control is usually sufficient.
A word about Flying Insects
The very small merchant grain beetle can live 3 to 4 years. Adult stored product moths don't feed and only live long enough to mate and lay eggs.
in ideal conditions, house flies could breed so fast we would soon be knee deep in them.