Synergistic weed control from applications of pyridine carboxylic acid herbicides and photosystem II inhibitors

• US 10,455,836 B2
• Filed: 09/15/2015
• Issued: 10/29/2019
• Est. Priority Date: 09/15/2014
• Status: Active Grant

• Current Assignee: Dow Agrosciences LLC (Corteva, Inc.)
• Original Assignee: Dow Agrosciences LLC (Corteva, Inc.)
• Inventors: Satchivi, Norbert M., Bangel, Bryston L., Schmitzer, Paul R.
• Primary Examiner(s): Pak, John
• Application Number:
  US14/854,397
• Publication Number:
  US 20160135456A1
• Time in Patent Office: 1,505 Days
• CPC Class Codes: A01N 37/18 containing the group —CO—N<, e.g. carboxylic acid amides or imides; Thio analogues thereof
• CPC Class Codes: A01N 37/34 Nitriles
• CPC Class Codes: A01N 37/40 having at least one carboxylic group or a thio analogue, or a derivative thereof, and one oxygen or sulfur atom attached to the same aromatic ring system
• CPC Class Codes: A01N 43/40 six-membered rings
• CPC Class Codes: A01N 43/54 1,3-Diazines; Hydrogenated 1,3-diazines
• CPC Class Codes: A01N 43/70 Diamino—1,3,5—triazines with only one oxygen, sulfur or halogen atom or only one cyano, thiocyano (—SCN), cyanato (—OCN) or azido (—N3) group directly attached to a ring carbon atom
• CPC Class Codes: A01N 43/707 1,2,3- or 1,2,4-triazines; Hydrogenated 1,2,3- or 1,2,4-triazines
• CPC Class Codes: A01N 43/78 1,3-Thiazoles; Hydrogenated 1,3-thiazoles
• CPC Class Codes: A01N 43/88 six-membered rings with three ring hetero atoms
• CPC Class Codes: A01N 47/30 Derivatives containing the group >N—CO—N aryl or >N—CS—N—aryl

Abstract

Disclosed herein are herbicidal compositions comprising a herbicidally effective amount of (a) a pyridine carboxylic acid herbicide or an agriculturally acceptable N-oxide, salt, or ester thereof, and (b) a photosystem II inhibitor, or an agriculturally acceptable salt or ester thereof. Also disclosed herein are methods of controlling undesirable vegetation which comprise applying to vegetation or an area adjacent the vegetation or applying to soil or water to prevent the emergence or growth of vegetation (a) a pyridine carboxylic acid herbicide or an agriculturally acceptable N-oxide, salt, or ester thereof, and (b) a photosystem II inhibitor, or an agriculturally acceptable salt or ester thereof, wherein (a) and (b) are each added in an amount sufficient to provide a herbicidal effect.

Claims

1. A herbicidal composition comprising a herbicidally effective amount of

(a) a pyridine carboxylic acid herbicide or an agriculturally acceptable N-oxide, salt, or ester thereof, and

(b) a photosystem II inhibitor selected from the group consisting of bromoxynil, bentazon, isoproturon, metribuzin, atrazine, agriculturally acceptable salts and esters thereof, and combinations thereof,

wherein (a) and (b) are provided in a weight ratio of (a) in grams acid equivalent to (b) in grams active ingredient of from 1:

90 to 1;

5, and

wherein the pyridine carboxylic acid herbicide comprises a compound defined by the formula below

2. The composition of claim 1, wherein the pyridine carboxylic acid herbicide comprises one of the following:

3. The composition of claim 1, wherein the pyridine carboxylic acid herbicide comprises

4. The composition of claim 1, wherein (b) is bromoxynil or an agriculturally acceptable salt or ester thereof.

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

6. The composition of claim 1, wherein (b) is metribuzin or an agriculturally acceptable salt thereof.

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

8. The composition of claim 1, further comprising an additional pesticide.

9. The composition of claim 1, wherein the active ingredients in the composition consist of (a) and (b).

10. The composition of claim 1, which wherein the composition is provided as a herbicidal concentrate.

11. The composition of claim 1, wherein R^1′

is hydrogen.

12. The composition of claim 1, wherein R^1′

is a substituted or unsubstituted C₈ arylalkyl group.

13. The composition of claim 1, wherein R^1′

is a benzyl group.

14. A method of controlling undesirable vegetation comprising applying to vegetation or an area adjacent the vegetation or applying to soil or water to control the emergence or growth of vegetation a herbicidally effective amount of the composition of claim 1.

15. The method of claim 14, wherein (a) and (b) are applied post-emergence to the undesirable vegetation.

16. The method of claim 14, wherein (a) is applied in amount of from 0.1 g ae/ha to 300 g ae/ha.

17. The method of claim 14, wherein (b) is applied in amount of from 5 g ai/ha to 4000 g ai/ha.

18. The method of claim 14, further comprising applying an additional pesticide.

19. The method of claim 14, wherein the undesirable vegetation includes a broadleaf weed.

20. The method of claim 14, wherein the undesirable vegetation comprises a herbicide resistant or tolerant weed.

21. The method of claim 14, wherein the undesirable vegetation includes velvetleaf, pigweed, rape, thistle, nutsedge, large crabgrass, barnyardgrass, poinsettia, common sunflower, ivyleaf morningglory, wild pansy, ivy-leaved speedwell, or a combination thereof.

22. The method of claim 14, wherein the active ingredients applied to the vegetation or an area adjacent the vegetation or applied to soil or water to control the emergence or growth of vegetation consist of (a) and (b).