CN-122028795-A - Weed control method

CN122028795ACN 122028795 ACN122028795 ACN 122028795ACN-122028795-A

Abstract

The present invention relates to a method of controlling the growth of monocotyledonous weeds having resistance to accase inhibiting herbicides other than compounds having formula (I) at a locus, said method comprising applying to the locus a herbicide composition comprising a compound having formula (I).

Inventors

S.J. DAVIS

Assignees

先正达农作物保护股份公司

Dates

Publication Date: 20260512
Application Date: 20241025
Priority Date: 20231103

Claims (15)

1. A method of controlling the growth of monocotyledonous weeds having resistance to accase inhibiting herbicides other than compounds having formula (I) at a locus, said method comprising applying to said locus a herbicide composition comprising a compound having formula (I). 。
2. The method of claim 1, wherein the locus further comprises monocot crop plants, and wherein the method selectively controls the growth of the monocot weeds at the locus that are resistant to accase inhibiting herbicides other than compounds having formula (I).
3. The method of claim 2, wherein the crop is a cereal crop.
4. A method according to claim 3, wherein the cereal crop is wheat or barley.
5. The method according to any one of the preceding claims, wherein the monocotyledonous weeds are resistant to pinoxaden.
6. The method according to any one of the preceding claims, wherein monocotyledonous weeds comprise one or more mutations at amino acid positions in the accase selected from the group consisting of I1781, W1999, W2027, I2041, D2078, C2088 and G2096.
7. The method of claim 6, wherein the monocot weed comprises one or more mutations at amino acid positions selected from the group consisting of I1781, W2027, D2078, and C2088 in the accase.
8. The method according to any one of the preceding claims, wherein the monocotyledonous weeds are selected from the group consisting of a Myrtus species, an Avena species, a lolium species, a Phalaris species, and a Setaria species.
9. The method of claim 8, wherein the monocotyledonous weeds are selected from the group consisting of barley grass, wild oat, infirm wild oat, perennial ryegrass, arundina graminifolia, and setaria.
10. The method of claim 9, wherein the monocotyledonous weeds comprise ryegrass.
11. The method according to any one of the preceding claims, wherein the compound of formula (I) is applied to the locus at a rate of 1 to 500 g/ha.
12. The method of any one of the preceding claims, wherein the herbicide composition further comprises a herbicide safener.
13. The method of any one of the preceding claims, wherein the herbicide composition comprises one or more additional herbicidal compounds.
14. The method of claim 13, wherein the one or more additional herbicides are selected from the group consisting of pyroxsulam, mesosulfuron, and florasulam.
15. Compounds of formula (I) Use for controlling monocotyledonous weeds that are resistant to accase-inhibiting herbicides other than compounds having formula (I).

Description

Weed control method Herbicides that inhibit acetyl-coa carboxylase (accase) have been developed in the middle of the 70 s of the 20 th century and are now widely used to control grassy (monocot) weeds in many crops, including, for example, small grain crops and dicot crops such as rice and soybean. Whereas accase-inhibiting herbicides (accase herbicide-HRAC group 1) facilitate post-emergence management of grasses, they provide a significant improvement over the selective grasses control methods currently in use, and are therefore soon adopted. However, over time, the extensive repeated use of accase herbicides results in resistance to the major gramineous weed species, and many gramineous weeds have been documented for accase herbicide resistance, and resistance problems are particularly pronounced in Lolium (Lolium), physalis (Alopecurus) and Avena (Avena) species. Thus, there is a need to provide additional agricultural methods that can provide adequate control of these problematic monocotyledonous weeds (accase resistant weeds) that are resistant to currently available accase-inhibiting herbicides. Unexpectedly, it has now been found that certain accase inhibiting herbicides previously disclosed in WO 2019/158666 provide very good control of such accase resistant weeds. Thus, according to the present invention there is provided a method of controlling the growth of monocotyledonous weeds having resistance to accase inhibiting herbicides other than compounds having formula (I) at a locus, said method comprising applying to the locus a herbicide composition comprising a compound having formula (I). Compounds having formula (I) are known from WO 2019/158666 and provide effective control of problematic weeds in crops, especially cereal crops. The compound having formula (I), also known as 3-acetyl-9- [2, 6-dimethyl-4- (1-propyn-1-yl) phenyl ] -10-hydroxy-3-azaspiro [5.5] undec-9-en-8-one, has CAS number 2374705-11-8. The compounds of formula (I) may exist in alternative forms, depicted as compound (Ia) as follows: Also known as 3-acetyl-9- [2, 6-dimethyl-4- (1-propyn-1-yl) phenyl ] -3-azaspiro [5.5] undecane-8, 10-dione, with CAS number 2374704-95-5. The present invention is based on the discovery that compounds having formula (I) (or (Ia)) are particularly effective in controlling monocotyledonous weeds that are resistant to accase-inhibiting herbicides. The term "locus" is simply understood to mean the location where accase resistant monocotyledonous weeds are present. Examples include gardens, roads, rails, but more common sites would be crop cultivation areas, such as fields. For the avoidance of doubt, it will be appreciated that the locus may further comprise other weeds, including those susceptible to accase herbicides. When the locus is a crop cultivation area, the methods of the invention have broad utility in controlling monocot accase resistant weeds in a wide variety of crop plants. For example, the herbicide composition can be applied prior to planting (prior to crop planting in the field) to control monocot accase resistant weeds in a variety of crops (including, for example, corn, cereal crops, cotton and soybean crops) that are subsequently planted at the locus. It will be appreciated that the crop plants may optionally comprise herbicide tolerance and/or insect tolerance and/or nematode tolerance traits. Furthermore, it is understood that some monocot crop plants (e.g., cereal crops) are inherently resistant to the compounds having formula (I), and thus in such cases, the herbicide composition may be applied in the presence of the crop plants present. Such application may be performed either pre-emergence (where the crop has been planted but has not emerged at the locus) or post-emergence (or "foliar aerial spray" where the crop has emerged at the locus). It will be appreciated that a combination of pre-planting, pre-emergence and post-emergence applications is used, depending on the particular needs of the grower. Thus, in a preferred embodiment of the invention, a method is provided, wherein the locus further comprises cereal crop plants, and wherein the method selectively controls the growth of accase resistant monocot weeds at the locus. Examples of such cereal crop plants include wheat, including spring and winter varieties thereof, and barley, including spring and winter varieties thereof, durum wheat, rye and triticale. Wheat is particularly preferred and includes cereal crops that include herbicide resistance, such as CLEARFIELDTM wheat. Several accase herbicides have been commercialized to assist growers in combating grassy weeds, and these include, for example, cyclohexanediones ("Dim"), such as clethodim, thioxanthone, pyrone, aryloxyphenoxy-propionate ("Fop"), such as clodinafop-propargyl, oxazamate-ethyl, haloxyfop-methyl, cyhalofop-butyl, halofop-butyl and quizalofop-ethyl, and "Den", such as pinoxaden. Accase resistant weeds were characterized using appropriate dose response c