Farnam Equine Nature's Defense Water Based Fly Spray for Horses Nature's Defense water-based Fly repellent spray offers a fresh alternative for pest control. Combines citronella with botanicals for control against five types of flies, mosquitoes and gnats Repels horn, stable, House, horse and deer flies, plus mosquitoes and gnats Contains no preservatives, additives or artificial colors and the alcohol-free formula won't irritate sensitive skin Contains citronella oil, clove oil, mint oil, thyme oil and sodium lauryl Sulfate Available in ready-to-use 32 oz. Spray or 32 oz. Concentrate that make 5 quarts