Companion Horse Fly Management and Sweet Itch Prevention

Biting insects cause significant distress to horses in summer. Sweet itch, caused by hypersensitivity to Culicoides midge bites, is a particularly severe welfare problem affecting many horses.

Key Facts

Sweet itch (Culicoides hypersensitivity) is estimated to affect 2-5% of the UK horse population
Affected horses develop intense pruritus (itching), self-excoriation and thickened skin from chronic scratching
Culicoides midges are most active at dawn and dusk, requiring horses to be stabled during these periods
Full-body sweet itch rugs provide physical barrier protection for affected horses
Ivermectin and other antiparasitic treatments do not prevent Culicoides bites
Some horses develop severe secondary infections from self-trauma that cause chronic suffering
Moving horses away from areas with standing water (midge breeding habitat) reduces exposure

Welfare Considerations

Sweet itch is one of the most distressing conditions in companion horses - the intense, persistent itching causes horses to rub themselves raw against posts, fences and trees. Self-excoriation can be severe enough to require veterinary wound management. The condition is seasonal but recurs every year throughout the horse's life, worsening progressively with each sensitisation. Welfare management requires a combination of physical protection (rugs), habitat management, and in severe cases veterinary intervention with antihistamines or corticosteroids. The chronic, recurring nature of sweet itch makes preventive management investment far more welfare-effective than reactive treatment.

What You Can Do

Stable or rug affected horses at dawn and dusk when Culicoides midges are active
Use a well-fitted sweet itch rug for horses confirmed to be affected
Move field water sources and improve drainage to reduce midge breeding habitat
Consult your vet about medical management options for severely affected horses
Consider relocation to windier, drier sites that reduce midge populations