Sewer flies probably could refer to several kinds of filth flies, but let's go with the common choice that you are referring to drain flies, also called moth flies in the family Psychodidae. The best way to control almost any problem with flies of any kind is to address the source of the problem, rather than trying to eliminate them by catching all the adult flies. Sticky fly traps like the Gold Stick are excellent for catching adult flies now and then, meaning yes, many kinds of flies will be attracted to the bright color of the tube and be captured on it. But, in a sense this is only harvesting some adult flies and more will be produced very rapidly from the breeding source.
In the case of drain flies that source is going to be some kind of very wet setting where a buildup of organic material is present. The larvae feed on this buildup that might be found in floor and sink drains, in sewers, in cracks and crevices on or at the edges of floors where filth accumulates, in A/C units, under refrigerators or washing machines, in bird baths and stagnant water outside, in sump pumps and grease traps, and nearly any place else that water and other wet organic matter can accumulate. In other words, there is no easy solution to the elimination of drain flies and to only use sticky traps for the adults is not going to be successful.
However, these flies and others, such as Phorids and fungus gnats, present a great opportunity for you to add some needed services for your customer. You need to begin with a very thorough inspection inside and outside to determine what the source and sources are. You then make recommendations as appropriate for physically eliminating that breeding environment. This may be draining bird baths and plant catch basins and maintaining them better. It may be repairing leaks in equipment where water constantly drips out. It may be better washing of floors and allowing them to dry properly. It may be better maintenance of potted plants to allow the soil to dry or to cover the soil to add a barrier to the flies. But, it also includes the regular use of drain cleaners to eliminate the buildup of scum that the flies rely on. This can be done by you and it is an important service.
So, sure, sticky traps and UV light traps can attract and capture most kinds of adult flies, but they will not control the situation. You have to go after the unnecessary breeding sites where the larvae are found.
Mr. Pest Control
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Please note, Mr. Pest Control is answering questions supplied by PMP customers across North America. His answers are generated from industry and manufacturer-provided information. The answer may not be specific to the laws and regulations for your State, Province, Territory or Country. In addition, products mentioned may not be registered and or available in all areas. Always check with your local Univar office for specific information to your area. Always read and follow label directions.