Best Horse Fly Spray: What Actually Works for Horseflies (Tested in Real Barn Conditions)
Quick Answer: The most effective horse fly sprays for horseflies are permethrin-based — Farnam Endure Sweat-Resistant is the best daily choice for most horses, while Absorbine UltraShield EX handles the heaviest horsefly pressure. For horses with pyrethrin sensitivity, Absorbine UltraShield Green is the gentler natural-based alternative. No spray alone eliminates horseflies — pairing any product …