Herbicidal compositions comprising 4-amino-3-chloro-5-fluoro-6-(4-chloro-2-fluoro-3-methoxyphenyl) pyridine-2-carboxylic acid or a derivative thereof and certain sulfonylureas

1. A herbicidal composition comprising a herbicidally effective amount of

(a) a compound of the formula (I):

or an agriculturally acceptable salt or ester thereof and

(b) a compound selected from the group consisting of: amidosulfuron, azimsulfuron, bensulfuron-methyl, chlorsulfuron, cyclosulfamuron, ethametsulfuron-methyl, ethoxysulfuron, flazasulfuron, flucetosulfuron, flupyrsulfuron-methyl sodium, foramsulfuron, imazosulfuron, iofensulfuron, iodosulfuron-methyl sodium, mesosulfuron-methyl, metsulfuron-methyl, nicosulfuron, orthosulfamuron, primisulfuron-methyl, propyrisulfuron, rimsulfuron, sulfometuron-methyl, sulfosulfuron, thifensulfuron-methyl, triasulfuron, tribenuron-methyl or trifloxysulfuron-sodium, or a salt or ester thereof, wherein (a) and (b) are present in the composition in a ratio such that the composition exhibits herbicidal synergy.

2. The composition of claim 1 , further comprising a herbicide safener.

3. The composition of claim 1 , further comprising an agriculturally acceptable adjuvant or carrier.

4. A method of controlling undesirable vegetation comprising the steps of: contacting the vegetation or the locus thereof with, or applying to soil or water to prevent the emergence or growth of vegetation, a herbicidally effective amount of a combination comprising (a) a compound of the formula (I):

or an agriculturally acceptable salt or ester thereof; and

(b) a compound selected from the group consisting of: amidosulfuron, azimsulfuron, bensulfuron-methyl, chlorsulfuron, cyclosulfamuron, ethametsulfuron-methyl, ethoxysulfuron, flazasulfuron, flucetosulfuron, flupyrsulfuron-methyl sodium, foramsulfuron, imazosulfuron, iofensulfuron, iodosulfuron-methyl sodium, mesosulfuron-methyl, metsulfuron-methyl, nicosulfuron, orthosulfamuron, primisulfuron-methyl, propyrisulfuron, rimsulfuron, sulfometuron-methyl, sulfosulfuron, thifensulfuron-methyl, triasulfuron, tribenuron-methyl or trifloxysulfuron-sodium, or a salt or ester thereof, wherein (a) and (b) are present in the combination in a ratio such that the combination exhibits herbicidal synergy; wherein the undesirable vegetation is controlled in direct-seeded, water-seeded and transplanted rice, cereals, wheat, barley, oats, rye, sorghum, maize, pastures, grasslands, rangelands and fallowland.

5. The method of claim 4 , wherein the undesirable vegetation is immature.

6. The method of claim 4 , wherein the (a) and (b) are applied to the water.

7. The method of claim 6 , wherein the water is part of a flooded rice paddy.

8. The method of claim 6 , wherein the (a) and (b) are applied pre-emergently to the undesirable vegetation or the crop.

9. The method of claim 6 , wherein the (a) and (b) are applied post-emergently to the undesirable vegetation or the crop.

10. The method of claim 6 , wherein the undesirable vegetation is controlled in glyphosate-, 5-enolpyruvylshikimate-3-phosphate synthase inhibitor-, glufosinate-, glutamine synthetase inhibitor-, dicamba-, phenoxy carboxylic acid auxin-, pyridine carboxylic acid auxin-, synthetic auxin-, auxin transport inhibitor-, aryloxyphenoxypropionates-, cyclohexanedione-, phenylpyrazoline-, acetyl CoA carboxylase inhibitor-, imidazolinone-, sulfonylurea-, pyrimidinylthiobenzoate-, triazolopyrimidine-, sulfonylaminocarbonyltriazolinone-, acetolactate synthase or acetohydroxy acid synthase inhibitor-, 4-hydroxyphenyl-pyruvate dioxygenase inhibitor-, phytoene desaturase inhibitor-, carotenoid biosynthesis inhibitor-, protoporphyrinogen oxidase inhibitor-, cellulose biosynthesis inhibitor-, mitosis inhibitor-, microtubule inhibitor-, long chain fatty acid inhibitor-, fatty acid and lipid biosynthesis inhibitor-, photosystem I inhibitor-, photosystem II inhibitor-, triazine-, or bromoxynil-tolerant crop.

11. The method of claim 6 , wherein the tolerant crop possesses multiple or stacked traits conferring tolerance to multiple herbicides.

12. The method of claim 6 wherein the undesirable vegetation comprises a herbicide resistant or tolerant plant.

13. The method of claim 12 , wherein the resistant or tolerant plant is resistant or tolerant to multiple herbicides.

14. The method of claim 12 wherein the resistant or tolerant plant is resistant or tolerant to acetolactate synthase or acetohydroxy acid synthase inhibitors, photosystem II inhibitors, acetyl CoA carboxylase inhibitors, synthetic auxins, auxin transport inhibitors, photosystem I inhibitors, 5-enolpyruvylshikimate-3-phosphate synthase inhibitors, microtubule assembly inhibitors, fatty acid and lipid synthesis inhibitors, protoporphyrinogen oxidase inhibitors, carotenoid biosynthesis inhibitors, long chain fatty acid inhibitors, phytoene desaturase inhibitors, glutamine synthetase inhibitors, 4-hydroxyphenyl-pyruvate-dioxygenase inhibitors, mitosis inhibitors, cellulose biosynthesis inhibitors, herbicides with multiple modes-of-action, quinclorac, arylaminopropionic acids, difenzoquat, endothall, or organoarsenicals.