Controls most annual and perennial grasses, broadleaf weeds, vines, and brambles. Also controls hardwood trees for site preparation and release of loblolly pine stands. Arsenal is an aqueous solution to be mixed in water and applied as a spray. For best results when using backpack sprayers, use a spray surfactant such as Cide Kick II. Active ingredient is 53.1% isopropylamine salt of imazapyr.