There are a number of sprays on the market but they mainly use the same ingredients of dicamba and mcpa . The success of a spray is correct mixing taking into account area and mix rate with water. Measure the area and spray evenly. A back pack with a boom spray works good. Add a surfactant and a dye colour. A good quality back pack costs about $200, A liter of herbicide such as kambaM costs about $35, surfactant $20, and dye $20.remember get the area right and mix rate right and you should be successful.