Although it is convenient to blame the presence of large numbers of flies on other sources such as city dumps, urban stables and kennels, the truth is that your garbage cans and those of your neighbors are the most likely sources of your fly problem. Thus, the key to solving fly problems is proper of management of garbage and other organic wastes, particularly pet feces that serve as breeding sites.
Indirect strategies for controlling flies should focus on the proper disposal of garbage and pet feces. Organic garbage from the kitchen should be well-wrapped and placed in a clean garbage can with a tight fitting lid. In the California study cited earlier it was found that well-wrapped garbage placed in suitable cans produced an average of 92 larvae per garbage can per week, compared to 1,131 larvae per can per week where the containers were unsatisfactory. This is over a 90% reduction.
In conclusion, the key to solving fly problems is proper management of garbage and other organic wastes, particularly pet feces that serve as breeding sites. Along with proper fitting screens and a fly swatter your fly problem should be reduced to something you can live with.
DAVID WHEELER'S PEST CONTROL