A synergistic herbicidal composition containing (a) a compound of or an agriculturally acceptable salt or ester thereof and (b) an imidazolinone, including but not limited to imazethapyr ammonium, imazamox ammonium, imazapic ammonium, imazapyr isopropylamine salt, imazamethabenz-methyl and imazaquin isopropylamine salt, provide control of undesirable vegetation e.g., in direct-seeded rice, water-seeded rice, 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, vegetables, industrial vegetation management (IVM) and rights of way (ROW).一種協同性除草組成物，其包含(a)式(I)化合物：或其農業上可接受之鹽類或酯類，以及(b)咪唑啉酮(imidazolinone)，其包括但不侷限於，咪唑乙煙酸銨(imazethapyr ammonium)、甲氧咪草煙銨(imazamox ammonium)、甲咪唑煙酸銨(imazapic ammonium)、咪唑煙酸異丙基胺鹽(imazapyr異丙基胺salt)、咪草酸甲酯(imazamethabenz-methyl)與咪唑喹啉酸異丙基胺鹽(imazaquin異丙基胺salt)，提供了，例如，在直播、湛水直播與插秧稻米、穀類、小麥、大麥、燕麥、黑麥、高粱、玉蜀黍或玉米、甘蔗、向日葵、芸苔、油菜、甜菜、大豆、棉花、鳳梨、蔬菜、牧草、草地、牧場、休耕地、草皮、樹與藤園、水生植物、種植作物、蔬菜、工業植被管理(IVM)與路權用地(ROW)中，之不良植被之控制。
