The Farnam® Mosquito Halt Fly Spray kills and repels mosquitoes that may transmit the West Nile Virus. It also effectively deals with face flies, stable flies and house flies. Formulated to provide both quick knockdown and residual control of insects, it contains two insecticides and two repellents. This spray also includes aloe and lanolin, and may be used on horses, ponies and foals. Quart.