Flies are among the most common pests and can multiply quickly. While purchasing fly traps from hardware stores and grocery stores is always an option, you can easily make your own homemade fly traps from a few simple ingredients that are probably already in your kitchen pantry.
We just put down lots of eucalyptus mulch all around the plants and yard. Huge reduction in the mosquitoes biting around that mulch so I know that one works pretty good. Just make sure your getting real eucalyptus mulch. They have it at Home D and Lowes