The disclosure relates to a method for controlling the growth of trifluralin-resistant annual ryegrass in cereals using a herbicidally effective amount of dithiopyr. The dithiopyr can be applied to the locus of a cereal, at planting or before weed emergence, or to an area containing the cereal or applied to the soil, either by incorporating it into the soil or to the soil surface at the time of planting the cereal or post-planting but before the weeds have emerged.
