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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.
Top 7 Essential Oils for Bugs. Seven of the top essential oils you can use in your fly spray concoctions include citronella, pine, peppermint, lavender, patchouli, sandalwood and rosemary. citronella: Not only does citronella help to repel flies in your garden, according to Winger, but also ants, fleas, gnats, mosquitoes, moths, nematodes and ticks.