PYRANHA® NULLI-FLY™ is an equine insecticide spray that features a ready-to-use, citronella scented formula. It won't attract dust and grime like oil-based products and offers long-lasting protection against a wide array of insects. NULLI-FLY™ can be wiped or sprayed on horses. Kills and Repels: Stable Flies, House Flies, Bot Flies, Horse Flies, Horn Flies, Ticks, Deer Flies, Mosquitoes, Fleas, Face Flies, Gnats, and Lice