Whitetail Institute Slay HerbicideProduct Description Whitetail Institute Slay Herbicide Ingredients Key Features Specifically developed for food plots. Spray spring or early summer when broad leaf weeds are emerging and in the early growth stages. Can be easily applied with a 4 wheeler or tractor sprayer. Safe for use in clover and alfalfa fields. Slay must be mixed with a surfactant or oil additive.