Mix one cup of Ivory liquid dish detergent with one gallon of water. Put the solution into a spray bottle. When you see the horse flies during the day, spray them with the solution. The soap mixture suffocates the flies, and it's organic, so it is not harmful to animals and vegetation. Combine mint flavored mouthwash, lemon dish soap and lemon ammonia in equal parts. Put the mixture into a spray bottle and spray your yard. Spray it on the grass, bushes, trees, lawn furniture and plants. This solution is also not harmful to plants or animals. The smell is appealing to humans but repels horse flies. Use a fly swatter to swat and kill horse flies. While it is impossible to completely get rid of a large horse fly population this way, if you are aggressive enough you can seriously decrease their number.
at 12:57 PM on Jul. 8, 2010