Current weather and delay conditions for (GRU) Sao Paulo-Guarulhos International Airport Conditions
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.
Seven Essential Oils. Seven of the top essential oils you can use in your fly spray concoctions include citronella, pine, peppermint, lavender, patchouli, sandalwood and rosemary.1  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.even of the top essential oils you can use in your fly spray concoctions include citronella, pine, peppermint, lavender, patchouli, sandalwood and rosemary.