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Another option is to mix small amounts of apple cider vinegar with the animal's drinking water; consuming this solution is known to change the blood pH of the horse, thus keeping horseflies away. Cider vinegar, coupled with essential oils, is also used in home sprays as the sharp odor may repeal horseflies.
Ovitrol Plus Flea, Tick and Bot Spray controls fleas, flea larvae, ticks, lice, mosquitoes, gnats and horse bots. Botfly eggs and flea eggs sprayed with this will not hatch into adults. Quickly kills adult fleas plus kills their hatching eggs for up to 2 months. Rapid action formula may be reapplied weekly.