A herbicidal suspension concentrate composition comprising at least one pyridine sulfonamide active ingredient and a polyether-polysiloxane. The pyridine sulfonamide compound preferably has the general formula I, shown below in which X is a hydrogen atom, a chlorine atom, a bromine atom, a methyl group, or a difluoromethyl group. Preferably the polyether polysiloxane is polyether polymethyl siloxane copolymer which may be modified. Ideally, the composition comprises 2-6%w/w pyridine sulfonamide active ingredient and 0.01-10% w/w polyether polysiloxane. The composition may further comprise a vegetable oil, a mineral oil, one or more surfactants and a stabilizer.
