The Horn Fly

• Bloodsucking pests
• Found on horses if pastured in regions where cattle are raised
• Half the size of the Stable Fly
• Found on the back sides and belly of horses
• Remain on host day and night
• Breed in freshly deposited manure
• Lifecycle is 10 days in hot humid weather

Control

• Remove the breeding material
• Cover stock piles of manure to prevent breeding
• If possible move horses away from cattle
• Keep paddocks and stalls free of manure

The Horse Fly

• One of the world’s largest flies
• 350 species in North America
• It is the female Horse Fly that bites
• She bites with a bayonet-like mouth piercing the skin for a blood meal
• A full meal may take her many bites
• She feeds during the day, preferring sunny areas.

Control

• Remove the breeding material by controlling moist areas
• Female flies lay eggs in the spring in wet vegetation to hatch in late summer
• Horses need shaded areas for protection against these harmful flies.