With so much open space and water on the golf course we have a had a bad deer fly problem over the past couple of years. These are the fly that have a triangular appearance, and they will follow you for a great distance then bite you multiple times. We are trying a deer fly traps on 15 to see if we can help reduce the population. This trap is designed to be chemical free, and will trap horse fly, deer fly, and yellow fly. Next time you are on the 15th hole look into the native to the left of the green and you will see the trap.