Ingredients You Should Avoid Using In Your Vape Juice The Beer Connoisseur Albaugh Crop Protection Surmise 5 Crossbow Specialty Herbicide 1 gal Flum Pebble Icy Mint Flum Pebble 6000 Clear (Float Pebble Edition) CASTRAKIL Active Ingredient: Fenoxaprop p ethyl Castrakil is a selective herbicide with systemic action. It is absorbed through the leaves and effectively controls grassy weeds in a wide variety of crops.