The feel-good natural horse fly spray. Farnam Nature's Defense water-based fly spray for horses offers a fresh alternative for insect pest control. Bid pesky flies a fond farewell when you choose Nature's Defense. Mother Nature's own secret weapon. This insect-deterrent formula combines citronella with other botanicals for effective control against five types of flies, mosquitoes, and gnats. Contains no preservatives, additives, or artificial colors. Feel good about making a natural product part of your fly control program. Works on horn, stable, house, horse and deer flies, plus mosquitoes and gnats. Alcohol-free formula won't irritate sensitive skin. Available in a ready-to-use 32 oz. quart trigger spray bottle and 32-ounce concentrate that you simply mix with water. Bugs don't fly with Farnam, your partner in horse care.