What FlyShield technology means for equine fly control

W.F. Young is using a new educational feature in Equus to explain the science behind FlyShield® Technology, the ingredient system behind its recently launched UltraShield® Gold equine fly spray. The company says the product was developed over roughly a decade and is designed to disrupt how flies and other biting insects locate and land on horses, rather than relying only on conventional kill-or-repel claims. Company materials say UltraShield Gold launched in March 2025, is labeled for horses, ponies, and foals over 12 weeks of age, and is marketed as protecting against more than 100 insect species. The product label lists six active ingredients: octanoic acid, nonanoic acid, decanoic acid, permethrin, pyrethrins, and piperonyl butoxide. (wfyoung.com)

Why it matters: For veterinary professionals, the bigger story is less about one branded spray and more about how equine fly control is evolving. Flies are more than a nuisance: stable flies can cause painful bites, stress, secondary skin problems, and can mechanically transmit disease, while control of several fly species remains difficult. Extension and veterinary sources continue to emphasize integrated pest management, including manure removal, environmental control, and targeted use of insecticides, because on-animal sprays alone often have limited or short-lived effects, especially for stable flies. That means products like this may help some pet parents and barns, but they still fit best as one part of a broader fly-control plan. (merckvetmanual.com)

What to watch: Watch for independent field data, practitioner feedback during the 2026 fly season, and whether W.F. Young publishes more evidence behind the “homing system” disruption claim. (wfyoung.com)