A synergistic herbicidal composition containing (a) a compound of formula (I): or an agriculturally acceptable salt or ester thereof and (b) dimethoxy-pyrimidine acids, including but not limited to bispyribac-sodium, pyribenzoxim, pyriftalid, pyriminobac-methyl and pyrimisulfan provide synergistic weed control of undesirable vegetation e.g., in direct-seeded, water-seeded, and transplanted rice, cereals, wheat, barley, oats, rye, sorghum, corn or maize, sugarcane, sunflower, oilseed rape, canola, sugar beet, soybean, cotton, pineapple, vegetables, pastures, grasslands, rangelands, fallowland, turf, tree and vine orchards, aquatics, plantation crops, industrial vegetation management (IVM) or rights of way (ROW).
