CHEMCHLOR ( Butachlor 50% EC ) is a Systemic Pre-emergent Herbicide An Herbicide of the Acetanilide class. It is used as a Selective Pre-emergent Herbicide for Transplanted rice. It treats Cyperus difformis, cyper Iria, Echinochola crusgalli, Echinochola colonum, Eclipta alba, Sphenoclea zeylancia in Paddy