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Use vinegar as a natural fly spray for your horse. You can use 2 cups of vinegar with 1 cup of water and 1 cup of Avon Skin So Soft bath oil mixed with 1 tbsp. of Eucalyptus oil. You can also add a tbsp. or two of citronella oil to this mixture. Shake it well and then spray on your horse.
I love Ovitrol. We have used it at the animal shelter that I work at for years and to be honest, it's the only thing I have ever seen kill fleas and ticks so quickly and efficiently. It also the best fly repellent I have seen, and I've used lots of that because I have horses.