Feed through fly control for horses prevents the development of stable and house flies in manure of treated horses; stops immature flies from developing into biting, breeding adults. Fly growth regulator, LarvaStop, breaks the fly life cycle by preventing the formation of fly larvae is exoskeletons when they molt, thereby resulting in their death. SimpliFly reduces the fly population by 97-100%. Highly palatable. Reduced-risk pesticide contains 0.24% diflubenzuron and no organophosphates.