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US-12616201-B2 - Herbicidal compositions comprising isoxaflutole

US12616201B2US 12616201 B2US12616201 B2US 12616201B2US-12616201-B2

Abstract

The present invention relates to a method for post-emergent weed control, which comprises applying an effective amount of a composition comprising herbicide A (component A), isoxaflutole (component B) and optionally at least one herbicide C (component C) to emerged weeds, or an area, where weeds are growing.

Inventors

  • Liliana Parra Rapado
  • Tobias SEISER
  • Fernanda Nunes Bressanin
  • Brady Scott ASHER
  • Misha Rose Manuchehri Byrd
  • Silke Zeyer

Assignees

  • BASF SE

Dates

Publication Date
20260505
Application Date
20250429
Priority Date
20240430

Claims (20)

  1. 1 . A method for post-emergent weed control, which comprises applying an effective amount of a composition comprising A) herbicide A-1: ethyl 2-[2-[[3-chloro-5-fluoro-6-[3-methyl-2,6-dioxo-4-(trifluoromethyl)pyrimidin-1-yl]-2-pyridyl]oxy]phenoxy]acetate; and B) isoxaflutole; wherein the weight ratio of herbicide A-1 to isoxaflutole is in the range of 1:2 to 1:8, to an area where weeds are growing, and wherein the method results in a synergistic effect of the composition in controlling the weeds.
  2. 2 . The method according to claim 1 , wherein the weight ratio of herbicide A-1 to isoxaflutole is in the range from 1:2 to 1:5.
  3. 3 . The method according to claim 1 , wherein the weight ratio of herbicide A-1 to isoxaflutole is in the range from 1:2 to 1:4.
  4. 4 . The method according to claim 1 , wherein the weight ratio of herbicide A-1 to isoxaflutole is in the range of 1:3 to 1:4.5.
  5. 5 . The method according to claim 1 , wherein herbicide A-1 and isoxaflutole are applied to weeds which are resistant to PPO inhibitors, glyphosate, glufosinate, 2,4-D, VLCFA inhibitors, ALS inhibitors and/or HPPD inhibitors.
  6. 6 . The method according to claim 1 , wherein the weeds to be controlled are monocotyledonous weeds and/or volunteer crop plants.
  7. 7 . The method according to claim 5 , wherein the weeds are selected from the families of Commelinaceae, Cyperaceae and Poaceae.
  8. 8 . The method according to claim 1 , wherein herbicide A-1 and isoxaflutole are applied when the weeds are between 2 and 60 cm tall.
  9. 9 . The method according to claim 1 , wherein herbicide A-1 and isoxaflutole are applied prior to seeding and/or planting or after seeding and/or planting of crop plants, but before the emergence of the crop plants.
  10. 10 . The method according to claim 1 , wherein herbicide A-1 and isoxaflutole are applied to an area where crop plants are grown or are to be grown, which have been rendered tolerant to PPO-inhibiting herbicides.
  11. 11 . The method according to claim 1 , wherein herbicide A-1 and isoxaflutole are applied to an area where crop plants are grown or are to be grown, which have been rendered tolerant to HPPD-inhibiting herbicides.
  12. 12 . The method according to claim 9 , wherein the crop plants are selected from Glycine max, Zea mays, Gossypium hirsutum, Gossypium arboreum, Gossypium herbaceum and Gossypium vitifolium.
  13. 13 . The method according to claim 1 , wherein the composition further comprises at least one herbicide C selected from the group consisting of saflufenacil, trifludimoxazin, glyphosate, glufosinate, 2,4-D, pyroxasulfone, imazethapyr, dimethenamid, dimethenamid-P, mesotrione, topramezone, and agriculturally acceptable salts and esters thereof.
  14. 14 . The method according to claim 13 , wherein the composition further comprises at least one herbicide C selected from saflufenacil and pyroxasulfone.
  15. 15 . The method according to claim 13 , wherein the herbicide A-1, isoxaflutole and at least one herbicide C are applied jointly.
  16. 16 . The method according to claim 13 , wherein herbicide A-1, isoxaflutole and at least one herbicide C are applied to weeds which are resistant to PPO inhibitors, glyphosate, glufosinate, 2,4-D, VLCFA inhibitors, ALS inhibitors and/or HPPD inhibitors.
  17. 17 . The method according to claim 13 , wherein the weeds to be controlled are monocotyledonous weeds and/or volunteer crop plants.
  18. 18 . The method according to claim 16 , wherein the weeds are selected from the families of Commelinaceae, Cyperaceae and Poaceae.
  19. 19 . The method according to claim 13 , wherein herbicide A-1, isoxaflutole and at least one herbicide C are applied when the weeds are between 2 and 60 cm tall.
  20. 20 . The method according to claim 13 , wherein herbicide A-1, isoxaflutole and at least one herbicide C are applied prior to seeding and/or planting or after seeding and/or planting of crop plants, but before the emergence of the crop plants.

Description

This application claims priority to European Patent Application No. 24173262.7, filed Apr. 30, 2024, the entire contents of which are hereby incorporated by reference in their entirety. The present invention relates to a method for post-emergent weed control, which comprises applying an effective amount of a composition comprising herbicide A (component A), isoxaflutole (component B) and optionally at least one herbicide C (component C) selected from the group consisting of saflufenacil, trifludimoxazin, glyphosate, glufosinate, 2,4-D, pyroxasulfone, imazethapyr, dimethenamid, mesotrione and topramezone to emerged weeds, or an area, where weeds are growing. One concern of farmers is the presence of unwanted plants in the area were crop plants are grown or are to be grown. The crop plants have to compete with the weeds on resources like space, water, sunlight or nutrients, which leads e.g. to decreased crop yield. Further, control of already emerged weeds (i.e. post-emergent weed control) is advantageous, as the farmer is able to easily identify not only the area, where weed-control is needed, but also the weed species as such. Thus, post-emergent weed control offers specific weed control, i.e. the farmer can adjust the weed control to the specific needs. Therefore, there is a need for highly effective post-emergent weed control, e.g. foliar weed control. Herbicide A (CAS 2158274-50-9) and its use to control emerged unwanted plants has been described in WO 2017/202768. While herbicide A shows excellent herbicidal activity, there is still room for improvement, for example regarding activity, spectrum of activity, application rates, compatibility with useful plants and especially efficient and reliable control of unwanted plants. In crop protection, it is desirable in principle to increase the specific activity of an active compound and the reliability of the effect. It is particularly desirable to control weeds (i.e. unwanted plants) effectively, but at the same time to be compatible with the useful plants in question. Also desirable is a broad spectrum of activity allowing the simultaneous control of unwanted plants. Frequently, this cannot be achieved using a single herbicidally active compound. It is known that special combinations of different specifically active herbicides result in enhanced activity of an herbicide in the sense of a synergistic effect. In this manner, it is possible to reduce the application rates of herbicides required for controlling unwanted plants. Mixtures comprising herbicide A and isoxaflutole have been described, for example in WO 2017/202768, US 2022/0322665 and US 2022/0322666. However there remains the need for a post-emergent weed-control, especially post-emergent weed control of Commelinids, which provides efficient control of emerged weeds. It is an object of the present invention to provide a method for post-emergent weed control, which comprises applying an effective amount of an herbicidal composition to an area, where weeds are growing. The composition should also show an accelerated action on unwanted plants. Surprisingly, it has been found that application of a composition comprising herbicide A and isoxaflutole, and optionally at least one herbicide C, have, when applied post-emergent, better herbicidal activity against (emerged) weeds, than would have been expected based on the herbicidal activity observed for the individual compounds. I.e., it has been found that post-emergent application of a composition comprising herbicide A (component A) and isoxaflutole (component B), and optionally at least one herbicide C (component C), to (emerged) weeds result in enhanced activity in the sense of a synergistic effect. The herbicidal activity to be expected for mixtures based on the individual compound can be calculated using Colby's formula (see below). If the activity observed exceeds the expected additive activity of the individual compounds, synergism is said to be present. Accordingly, the present invention relates to a method for post-emergent weed control, which comprises applying an effective amount of a composition comprising A) herbicide A selected from the group consisting of A-1: ethyl 2-[2-[[3-chloro-5-fluoro-6-[3-methyl-2,6-dioxo-4-(trifluoromethyl)pyrimidin-1-yl]-2-pyridyl]oxy]phenoxy]acetate;A-2: 2-[2-[[3-chloro-5-fluoro-6-[3-methyl-2,6-dioxo-4-(trifluoromethyl)pyrimidin-1-yl]-2-pyridyl]oxy]phenoxy]acetic acid including its agriculturally acceptable salts; and B) isoxaflutole; to an area, where weeds are growing. Preferably, the present invention relates to a method for post-emergent weed control, which comprises applying an effective amount of a composition comprising A) herbicide A-1: ethyl 2-[2-[[3-chloro-5-fluoro-6-[3-methyl-2,6-dioxo-4-(trifluoromethyl)-pyrimidin-1-yl]-2-pyridyl]oxy]phenoxy]acetate; andB) isoxaflutole; to an area, where weeds are growing. The invention also relates to a method and to compositions for post-emergent wee