Several species of flies enter homes in Colorado. Most are mere nuisance problems, such as cluster flies and face flies, which are found during fall and winter. They use homes for shelter from the cold but do not reproduce at this time.  Blow flies and house flies are found in the home during summer. These flies develop in trash, manure or other animal materials.  The best way to control fly problems in a home is to exclude them by screening.  Insecticides can also supplement other controls for some flies.

Most flies are simply nuisance pests, but others can transmit diseases. House flies, face flies and blow flies develop in manure, carrion, and garbage and are commonly contaminated with disease-causing bacteria, including those associated with food poisoning.

There are also several flies found in Colorado that do bite people.  These include black flies, biting midges and deer flies.  Mosquitoes are the most well known of the biting flies, but several other species can be found locally and are a nuisance that can cause public health problems. While all biting flies are blood feeders, none, aside from mosquitoes, are known to transmit human diseases in Colorado. Some flies, however, can transmit animal diseases. Lastly, bites can be painful or produce swelling and intense itching as the result of injected saliva.

Spraying, fogging, baiting and trapping are very effective in controling these flies. Having Critter Gitterz out each month durring the spring, summer and fall months will reduce the number of flies and keep them out of your house.