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.
Ovitrol Plus Flea/Tick/Bot Spray for Dogs,Cats & Horses quickly kills and repels mosquitoes, fleas, ticks, flies and lice. 1  Contains Precor Insect Growth Regulator to kill flea eggs and larvae for up to 2 months.  Can be reapplied weekly.