The Advantage Fly Banquet Lure states that it works on blow flies, bottle flies, large gnats, barn flies, house flies and more. This could include horse flies but we are not certain. If you are looking for a bait product you can contact the manufacturer to see if this would meet your needs. JF Oakes 1-800-844-9296. If a bait is not necessary, you could use a general insecticide product like
Talstar that is a residual and will control any insect that lands on a surface that has been treated with it.