Farnam SimpliFly 3.75lbs

Formulated to help reduce fly populations by 97–100%.
Daily supplement works to prevent the development of house and stable flies in the manure of your treated horses.
Contains larvastop, an insect growth regulator that helps break the fly life cycle.
Highly palatable pellets are easy to add to your horse’s regular meals.
Feed throughout the season until cold weather restricts fly activity.