No, the Advantage Fly Trap will not work for horse flies or deer flies. Biting flies are drawn to different environments than non biting flies like cluster flies or house flies. Because of the nature of deer and horse flies there is not really a good way to get rid of them. Fortunately, the season for deer flies is rather short, usually four to five weeks in June or July, and three to four weeks in August for horse flies.
Answer last updated on: 07/18/2010