Flies are among the most difficult pests to control. You should not wait until a problem exists to begin a fly control program. A good program needs to be in place before fly numbers increase.
Sanitation is the most important factor in any fly control plan.
Manure and other organic fly breeding material should be regularly removed from barn and stable areas. Composting manure can also aid in fly control. The heat generated by proper composting will kill fly eggs, therefore reducing fly populations.
Clean up spilled feed and other organic materials to prevent additional fly breeding grounds.
Automatic waterers should also be properly cleaned and maintained.