How do I implement effective fly control at a horse facility?

Fly control at a horse facility requires a multi-pronged approach because no single method effectively controls flies when used alone. An integrated approach that addresses breeding sites, adult flies, and the horses' direct exposure simultaneously produces significantly better results than any single strategy. Manure management is the most impactful fly control measure available, because manure is the primary breeding site for the flies that affect horses most. Fresh manure removed from stalls and paddocks daily, composted rapidly at high temperatures, or hauled away from the facility eliminates the breeding substrate that sustains fly populations. A facility with consistent daily manure removal has fundamentally lower fly pressure than one where manure accumulates, regardless of what other control measures are in place. Fly traps — bag traps, sticky traps, and electric traps — capture adult flies and can reduce populations meaningfully when positioned correctly and changed regularly before they become full and ineffective. Traps work best when positioned at fly entry points to the barn and away from the horses themselves, drawing flies toward the trap rather than toward the animals. Fly spray applied to horses provides direct protection during peak activity periods but requires consistent reapplication because most products break down in sunlight and wash off with sweat. Fly sheets, masks, and leg wraps provide physical barrier protection that does not require reapplication. Biological controls — parasitic wasps that parasitize fly pupae before they hatch — are a chemical-free approach to reducing fly populations at their source when introduced consistently at recommended intervals throughout fly season.