Horse Fly Strike Prevention in Summer

Fly strike and fly-related distress are major welfare problems for horses in summer. Effective prevention protects horses from painful wound myiasis and constant harassment.

Key Facts

Fly strike (myiasis) occurs when flies lay eggs in wounds or moist skin, with larvae causing tissue damage
Common wound flies include Lucilia sericata and Calliphora species
Horses with wounds, moist skin folds, or poor perineal conformation face highest risk
Constant fly harassment causes behavioral stress, impaired grazing, and energy expenditure
Fly masks, rugs, and insecticide treatments all contribute to protection when used appropriately
Stable management including manure removal significantly reduces local fly populations

Welfare Considerations

The welfare impact of fly harassment extends well beyond fly strike itself. Horses subjected to constant fly pestering show elevated stress, impaired feeding, and behavioral frustration. In summer months, some horses spend more time managing flies than grazing. Fly strike when it occurs causes acute pain and tissue destruction. A multi-modal prevention approach addressing both fly population reduction and individual horse protection provides the best outcomes.

What You Can Do

Apply fly repellent products daily during peak fly season, focusing on legs, belly, and face
Use well-fitting fly masks and fly rugs for horses with particular sensitivity
Remove manure from stables and turnout areas frequently to reduce fly breeding sites
Check all wounds and moist skin areas daily for signs of fly eggs or larvae
House horses during peak fly activity periods (midday) if pasture fly pressure is severe
Treat fly strike wounds immediately by removing larvae and applying veterinary-recommended products