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- 1). Spray any shrubs or vegetation around the pool with a horse fly insecticide designated for use on plants. Follow package instructions for application.
- 2). Set up a battery-operated fan near the pool. For larger pools, set up one at each end. Horseflies are particularly active on still days, so the wind from the fans may help deter them.
- 3). Cut a piece of thin rope to a length of 12 inches. Use duct tape to tape a medium-sized black ball to the end of the rope. Tape the other end of the rope to the bottom of a stool. The stool should be at least 2 feet tall.
- 4). Press fly paper onto the bottom of the stool, around the spot where the rope is attached. Set the stool on top of a table that is at least 10 feet away from the pool. The flies will be drawn to the ball, and will get trapped in the fly paper when they fly upward upon realizing the ball is not a food source.
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