Remove standing water and muddy areas
Mow grass and trim weeds regularly
Keep manure and organic waste cleaned up
Use fans in barns, stalls, and outdoor seating areas
Install fine mesh screens on windows and doors
Use fly traps placed away from people and animals
Apply insect repellents labeled for horse flies
Use fly sheets, masks, and leg wraps on horses
Stable horses during peak horse fly activity
Avoid turnout near woods, water, and marshy areas
Use insecticidal sprays or premise treatments as directed
Seal gaps and entry points in buildings
Remove decaying vegetation and damp leaf litter
Wear light-colored, long-sleeved clothing outdoors
Use citronella or other approved outdoor repellents
Call a pest control professional for severe infestations