Horse Sweet Itch and Insect Management

Sweet itch is a common and severely welfare-compromising allergic skin condition in horses. Prevention and management significantly improve quality of life for affected animals.

Key Facts

Sweet itch (equine insect bite hypersensitivity) affects 2-5% of horses in the UK
It is caused by hypersensitivity to the saliva of Culicoides midges
Severely affected horses scratch constantly causing mane and tail hair loss and skin damage
There is no cure - management focuses on reducing midge exposure
Fly rugs, stabling at dusk and dawn, fan systems and topical repellents are evidence-based management tools

Welfare Considerations

Sweet itch causes significant and prolonged suffering in affected horses. The pruritis (itching) is severe and relentless during midge season from April to October. Horses damage their own skin through persistent rubbing, creating open wounds vulnerable to secondary infection. The welfare cost is year-round in severely affected animals. Successful management requires multiple simultaneous interventions: sweet itch rugs that cover the belly (where midges preferentially bite), stabling at peak midge activity times, insect repellent application and environmental management to reduce midge breeding habitat.

What You Can Do

Fit sweet itch-specific rugs covering the belly and extending to the face for severely affected horses
Stable horses between 4-9pm and 4-8am when midge activity peaks
Remove standing water and organic matter near stabling to reduce midge breeding habitat
Apply DEET-based or licensed equine repellents twice daily during midge season
Discuss Cytopoint or experimental desensitisation protocols with your vet for severe cases