FIELD: agriculture.SUBSTANCE: inventions relate to agriculture. Herbicidal agent contains, as herbicidally active components: A) aclonifen (component A), B) pyroxasulfone (component B) and C) picolinafen (component C). Herbicide for combating harmful plants is applied. Herbicide is used to control herbicide-resistant harmful plants, wherein components A, B and C of the herbicidal agent are jointly or separately applied to plants, plant parts, seeds or the surface on which the plants grow.EFFECT: inventions make it possible to simplify the technology of using aclonifen, to increase the reliability of the action and the flexibility of using active substances.10 cl, 1 tbl, 9 ex