Herbicidal compositions comprising 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)-5-fluoropyridine-2-carboxylic acid or a derivative thereof and flurtamone, diflufenican, or picolinafen

1. A herbicidal composition comprising a synergistic herbicidally effective amount of (a) a compound of the formula (i)

or an agriculturally acceptable salt or ester thereof and (b) one or more compounds selected from the group consisting of diflufenican and picolinafen.

2. The composition of claim 1 , further comprising (c) flufenacet.

3. The composition of claim 1 , wherein (b) is diflufenican and the composition further comprises flurtamone.

4. The composition of claim 1 , wherein (b) is picolinafen.

5. The composition of claim 1 , wherein (b) is diflufenican.

6. The composition of claim 1 , wherein (a) is the benzyl ester of the compound of formula (i).

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

8. The composition of claim 1 , wherein (a) is the benzyl ester of the compound of formula (i), (b) is picolinafen, and the weight ratio of (a) to (b) is from about 1.0-40 of (a) to about 1.25-100 of (b).

9. The composition of claim 1 , wherein (a) is the benzyl ester of the compound of formula (i), (b) is diflufenican, and the weight ratio of (a) to (b) is from about 1.0-40 of (a) to about 1.25-100 of (b).

10. The composition of claim 1 , wherein (a) is the benzyl ester of the compound of formula (i), (b) is diflufenican and the composition further comprises flurtamone, and the weight ratio of (a) to flurtamone to diflufenican is from about 1.0-40 of (a) to about 30-250 of flurtamone to about 1.25-100 of diflufenican.

11. The composition of claim 2 , wherein (a) is the benzyl ester of the compound of formula (i), (b) is diflufenican and the composition further comprises flurtamone, and the weight ratio of (a) to flurtamone to diflufenican to (c) flufenacet is from about 1.0-40 of (a) to about 30-250 of flurtamone to about 1.25-100 of diflufenican to about 15-240 of (c) flufenacet.

12. A method of controlling undesirable vegetation which comprises applying to an area where control of undesireable vegetation is desired a synergistic herbicidally effective amount of a combination comprising (a) a compound of formula (i) or an agriculturally acceptable ester or salt thereof and (b) one or more compounds selected from the group consisting of diflufenican and picolinafen.

13. The method of claim 12 , further comprising (c) flufenacet.

14. The method of claim 12 , wherein the undesirable vegetation is controlled in rice, wheat, triticale, barley, oats, rye, corn, maize, cereals, pastures, grasslands, rangelands, fallowland, and, industrial vegetation management or rights-of-way.

15. The method of claim 12 , wherein the undesirable vegetation is immature.

16. The method of claim 12 , wherein the herbicidally active combination is applied pre-emergently.

17. The method of claim 12 , wherein the herbicidally active combination is applied post-emergently.

18. The method of claim 12 , wherein the undesirable vegetation is controlled in a glyphosate-, glufosinate-, dicamba-, phenoxy auxin-, pyridyloxy auxin-, aryloxyphenoxypropionate-, acetyl coa carboxylase (accase) inhibitor-, imidazolinone-, acetolactate synthase (als) inhibitor-, 4- hydroxyphenyl-pyruvate dioxygenase (hppd) inhibitor-, protoporphyrinogen oxidase (ppo) inhibitor-, triazine-, or bromoxynil-tolerant crop.

19. The method of claim 12 , wherein (a) is the benzyl ester of the compound of formula (i), (b) is picolinafen, and (a) and (b) are applied in a weight ratio of (a) to (b) of from about 1.0-40 of (a) to about 1.25-100 of (b).

20. The method of claim 12 , wherein (a) is the benzyl ester of the compound of formula (i), (b) is diflufenican, and (a) and (b) are applied in a weight ratio of (a) to (b) of from about 1.0-40 of (a) to about 1.25-100 of (b).

21. The method of claim 12 , wherein (a) is the benzyl ester of the compound of formula (i) and the combination further comprises (c) diflufenican and (d) flurtamone, and (a), (d) flurtamone, and (c) diflufenican are applied in a weight ratio of (a) to (d) flurtamone to (c) diflufenican of from about 1.0-40 of (a) to about 30-250 of (d) flurtamone to about 1.25-100 of (c) diflufenican.

22. The method of claim 12 , wherein (a) is the benzyl ester of the compound of formula (i) and the combination further comprises (c) diflufenican, (d) flufenacet, and flurtamone, and (a), flurtamone, (c) diflufenican, and (d) flufenacet are applied in a weight ratio of (a) to flurtamone to (c) diflufenican to (d) flufenacet of from about 1.0-40 of (a) to about 30-250 of flurtamone to about 1.25-100 of (c) diflufenican to about 15-240 of (d) flufenacet.

23. The method of claim 12 , wherein the undesirable vegetation is chenpodium, cirsium, galium, kochia, lamium, matricaria, papaver, salsola, sinapis, veronica, or viola.

24. The method of claim 12 , wherein the undesirable vegetation is cheal, cirar, galap, kchsc, lampu, match, paprh, sash, sinar, verpe, or viotr.