Bonide Brush Killer BK-32 kills the toughest brush without compromising lawn quality. Systemic action works on contact and attacks everything down to the root. Rainproof in hours. Effective on over 150 difficult weeds, including willow, blackberry, choke cherry, poison ivy and kudzu. Active ingredients: Dimethylamine salt of 2-Methyl-4-Chlorophenoxyacetic acid, Triethylamine salt of 3,5,6-Trichloro-2-Pyridinyloxyacetic acid, Dimethylamine salt of Dicamba (3,6-Dichloro-o-Anisic acid).