Control methods for the Japanese pampas grass (Digitaria sanguinalis)

Abstract

To provide a method that exhibits excellent effectiveness in controlling the Japanese pampas grass (Digitaria sanguinalis). [Solution] A method for controlling Digitaria sanguinalis, comprising applying at least one compound selected from the group consisting of compounds of formula (2), etc., to Digitaria sanguinalis or to a place where Digitaria sanguinalis grows. TIFF2026064332000026.tif70111

Description

Technical Field

[0001] The present invention relates to a method for controlling Susuki mesquite grass.

Background Art

[0002] Susuki mesquite grass is a tropical grass of the Poaceae family and is one of the weeds that pose a problem as a difficult-to-control weed in South America (Non-Patent Document 1).

Prior Art Documents

Non-Patent Documents

[0003]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a method that exhibits an excellent effect in controlling Susuki mesquite grass.

Means for Solving the Problems

[0005] The present inventors have found that by applying at least one compound selected from the following group (A), an excellent control effect against Susuki mesquite grass can be exhibited. That is, the present invention includes the following aspects. [1] A method for controlling Susuki mesquite grass, comprising applying at least one compound selected from the following group (A) to Susuki mesquite grass or a place where Susuki mesquite grass grows. Group (A): The compound represented by the following formula (1) The compound represented by TIFF2026064332000001.tif90114, The following formula (2) The compound represented by TIFF2026064332000002.tif72114, The following formula (3) The compound shown in TIFF2026064332000003.tif84121, The following formula (4) The compound shown in TIFF2026064332000004.tif77112, The following formula (5) The compound shown in TIFF2026064332000005.tif78109, The following formula (6) The compound represented by TIFF2026064332000006.tif77106, The following formula (7) The compounds shown in TIFF2026064332000007.tif76103, and The following formula (8) A group consisting of compounds shown in TIFF2026064332000008.tif7097. [2] The control method according to [1], wherein the Japanese grass (Digitaria sanguinalis) is resistant to glyphosate. [3] The control method according to [1], wherein the place where the Japanese dwarf grass grows is a cultivation area for corn, soybeans, and cotton. [4] The control method described in [1], wherein the area where the Japanese pampas grass grows is a soybean cultivation area. [5] The control method according to [1], wherein the application rate of at least one compound selected from group (A) is 10 to 100 grams per hectare. [6] The control method according to [1], wherein at least one compound selected from group (A) is the compound represented by formula (2). [7] Use of at least one compound selected from group (A) for the control of the Japanese grass (Digitaria sanguinalis). [Effects of the Invention]

[0006] The present invention provides an efficient method for controlling the Japanese pampas grass (Digitaria sanguinalis). [Modes for carrying out the invention]

[0007] The present invention provides a method for controlling Digitaria sanguinalis (hereinafter referred to as the "present invention method"), which includes applying at least one compound selected from the group (A) (hereinafter referred to as "compound A") to Digitaria sanguinalis or to a place where Digitaria sanguinalis grows.

[0008] The compound represented by formula (1) above (hereinafter referred to as Compound X1) is flufenoximacil (CAS RN®: 2759011-88-4), and is listed, for example, in the datasheet (www.bcpcpesticidecompendium.org / flufenoximacil.html) in the Compendium of Pesticide Common Name registration database on the British Crop Production Council (BCPC) electronic site (www.bcpcpesticidecompendium.org). Compound X1 can be produced by known methods, such as those described in International Publication No. 2021 / 139482. The compound represented by formula (2) above (hereinafter referred to as Compound X2) is a known compound and can be produced by known methods, such as those described in International Publication No. 2017 / 202768. The compound represented by formula (3) (hereinafter referred to as Compound X3) is a known compound and can be manufactured by known methods described in International Publication No. 2021 / 175689. The compound represented by formula (4) (hereinafter referred to as Compound X4) and the compound represented by formula (5) (hereinafter referred to as Compound X5) are known compounds and can be manufactured by known methods described in International Publication No. 2016 / 095768. The compound represented by formula (6) (hereinafter referred to as Compound X6) is a known compound and can be manufactured by known methods described in International Publication No. 2022 / 138633. The compound represented by formula (7) (hereinafter referred to as Compound X7) is a known compound and can be manufactured by known methods described in International Publication No. 2023 / 228935. The compound represented by formula (8) above (hereinafter referred to as compound X8) is a known compound and can be manufactured by known methods described in International Publication No. 2023 / 249039.

[0009] In the present invention, Digitaria sanguinalis resistant to a specific herbicide refers to Digitaria sanguinalis in which even four times the minimum amount of the specific herbicide required to kill or irrevocably suppress wild-type Digitaria sanguinalis does not result in killing or irrevocably suppressing it.

[0010] Digitaria insularis, which can be controlled by the method of the present invention, may have herbicide resistance. For example, the Digitaria insularis may have glyphosate resistance or haloxyfop-P-methyl resistance (Non-Patent Literature 1). Examples of site mutations that cause glyphosate resistance include amino acid substitutions in the 5-enolpyruvirshikimic acid-3-phosphate synthase (hereinafter sometimes referred to as EPSPS) gene, such as Thr102Ile, Pro106Ser, Pro106Ala, Pro106Leu, and Pro106Thr. Digitaria insularis, which can be controlled by the method of the present invention, may have glyphosate resistance due to an increase in the copy number of the EPSPS gene or due to vacuolar transport by the ABC transporter. Site mutations that cause haloxyfop-P-methyl resistance include amino acid substitutions in the acetyl-CoA carboxylase (hereinafter sometimes referred to as ACCase) gene, such as Ile1781Leu, Ile1781Val, Ile1781Thr, Trp1999Cys, Trp1999Leu, Ala2004Val, Trp2027Cys, Ile2041Asn, Ile2041Val, Asp2078Gly, Cys2088Arg, and Gly2096Ala. Even if Digitaria sanguinalis, which is resistant to glyphosate and haloxyfop-P-methyl, is further resistant to acetolactate synthesis inhibitors and glufosinate, it can be effectively controlled by the method of the present invention.

[0011] In the method of the present invention, agricultural land is an example of a place where the Japanese pampas grass grows. The agricultural land is not particularly limited as long as it is land where crops such as agricultural products are cultivated, but examples include fields, paddy fields, seedling trays, seedling boxes, and nurseries.

[0012] The crops cultivated on farmland are not particularly limited as long as they are varieties commonly grown as crops. Examples of such crops include corn, soybeans, and cotton. The corn (Zea mays) may be from any maturity group, from early to late maturing, and is generally a dent corn variety, but may also be a flint corn, flour corn, popcorn, waxy corn, sweet corn, etc. The corn is also commonly a field corn, that is, a group of varieties mainly consisting of dent corn, flint corn, and hybrids of dent corn and flint corn. The corn varieties are usually hybrid varieties. The soybean (Glycine max) may be from any maturity group, from early to late maturing varieties, and its growth type (infinite growth, finite growth, semi-finite growth) is not specified, but it is preferably the infinite growth type; its growth type (vining, shrub) is not specified, but it is preferably the shrub type; its cotyledon color (yellow, green) is not specified, but it is preferably yellow; and its seed coat color (colorless, black, green, brown) is not specified, but it is preferably colorless. The soybean may be a green-harvested variety or an edamame variety, but it is preferably a variety that is harvested as fully mature seeds. The cotton mentioned above is preferably of the Upland variety (Gossypium hirsutum), but may also be of the Pima variety (Gossypium barbadense). The soybean and cotton varieties are usually inbred varieties.

[0013] The method of the present invention is not limited by the intended use of the crop harvest. For example, the intended use of the crop harvest may be for seed production, ornamental purposes, green manure, silage, grain, or fiber, and may also be primarily for processing the grain, such as for starch, ethanol purification, brewing, oil extraction, animal feed, sugar production, or food. In the method of the present invention, corn is cultivated mainly for animal feed and for its seeds used in ethanol production, and soybeans are cultivated mainly for animal feed and for their seeds used in oil extraction. In the method of the present invention, cotton is cultivated mainly for its capsules used for lint (fiber) and its seeds used in oil extraction.

[0014] The crop may be a crop that can be produced by natural crossing, a crop that can be generated by mutation, an F1 hybrid crop, or a transgenic crop (also referred to as a genetically modified crop). Generally, these crops have characteristics such as conferring resistance to herbicides, accumulating toxic substances against pests, suppressing susceptibility to diseases, increasing yield potential, improving resistance to biotic and abiotic stress factors, accumulating substances, and improving storage and processing properties. Maize, soybean, and cotton that have been conferred resistance to the present Compound A are described in, for example, JP 2024-051128.

[0015] When cultivating the above crops, the seeds of the crops may be seed-treated with at least one pesticide or agricultural material selected from the group consisting of neonicotinoid compounds, diamide compounds, carbamate compounds, organophosphorus compounds, biological nematicide compounds, other insecticide compounds and nematicide compounds, and azole compounds, strobilurin compounds, metalaxyl compounds, SDHI compounds, other fungicide compounds, plant growth regulators, nitrogen-fixing bacteria, and mycorrhizal fungi. The cultivation land may be a previously plowed field (cultivation land for plowing cultivation) or a field that has not been plowed beforehand (cultivation land for non-plowing cultivation), or may be a cultivation land for strip tillage cultivation combining them or minimum tillage cultivation with minimal plowing. The cultivation land is preferably a cultivation land for non-plowing cultivation. In non-plowing cultivation, a cover crop may be sown after harvesting the previous crop.

[0016] The growth stages of Japanese stiltgrass that can be controlled by the method of the present invention are before germination, cotyledon to the 10-leaf stage of true leaves. Specifically, they include cotyledon, the 2-leaf stage of true leaves, the 3-leaf stage of true leaves, the 4-leaf stage of true leaves, the 5-leaf stage of true leaves, the 6-leaf stage of true leaves, the 7-leaf stage of true leaves, the 8-leaf stage of true leaves, or the 9-leaf stage of true leaves.

[0017] The application rate of compound A in the method of the present invention is 1 to 500 g per hectare, preferably 3 to 200 g per hectare, more preferably 10 to 100 g per hectare, and even more preferably 20 to 40 g per hectare. The above application rates can also be expressed as "approximately." "Approximately" means plus or minus 10%, for example, approximately 200 g means 180 to 220 g. "Approximately" can be used in the same sense not only for application rates, but also for numerical values ​​described herein such as spray volume, percentage, parts per million (ppm), magnification, and ratio. Methods for applying compound A include spraying it on the soil before the emergence of Japanese dwarf grass (soil treatment) and spraying it on emerged Japanese dwarf grass (foliar spraying). When compound A is applied to emerged Japanese dwarf grass, it can be considered that soil treatment is performed simultaneously with foliar spraying. The timing of application can be determined independently of the crop's growth stage; for example, foliar spraying may be performed on emerged Japanese dwarf grass before sowing the crop, or soil treatment may be performed during crop growth. Spraying is usually carried out by mixing a formulation containing compound A with water to prepare a spray solution, and then using a sprayer equipped with a nozzle. The amount of spray solution is not particularly limited, but is usually 50 to 1000 L per hectare, preferably 100 to 500 L per hectare, and more preferably 140 to 300 L per hectare. Furthermore, when applying compound A, an adjuvant may be mixed in. The type of adjuvant is not particularly limited, but examples include oil-based adjuvants such as Agri-Dex and MSO, nonionic adjuvants such as Induce (polyoxyethylene esters or ethers), anionic adjuvants such as Gramin S (substituted sulfonates), cationic adjuvants such as Genamin T 200BM (polyoxyethyleneamine), and organosilicon adjuvants such as Silwet L77. In addition, drift-reducing agents such as Intact (polyethylene glycol) may be mixed in. The pH and hardness of the aforementioned spray solution are not particularly limited, but are usually between 5 and 9, and the hardness is usually between 0 and 500 ppm on the American hardness scale. There are no particular restrictions on the time of day when compound A is applied, but it is usually between 5:00 AM and 9:00 PM, and the photon flux is usually between 10 and 2500 micromoles / m². 2 It is per second. The spray pressure when applying compound A is not particularly limited, but is usually 30 to 120 PSI, and preferably 40 to 80 PSI.

[0018] In the method of the present invention, compound A is usually mixed with a carrier such as a solid carrier or a liquid carrier, and further formulated by adding a formulation aid such as a surfactant as needed. Preferred formulations are water-soluble liquid, water-soluble granule, aqueous liquid suspension, oily liquid suspension, wettable powder, wettable granule, granule, aqueous emulsion, oily emulsion, ssupoemulsion, and emulsion. More preferably, it is an emulsion. A formulation containing compound A as the sole active ingredient may be used alone, or it may be mixed with a formulation containing another herbicide as the active ingredient. Alternatively, a formulation containing compound A and another herbicide as active ingredients may be used. Furthermore, a formulation containing compound A and another herbicide as active ingredients may be mixed with a formulation containing a different herbicide as the active ingredient. The proportion of the active ingredient in the formulation (compound A or compound A plus other herbicides) is usually 0.01 to 90% by weight, preferably 1 to 80% by weight.

[0019] When the method of the present invention is implemented in a crop cultivation area, compound A may be applied to the crop cultivation area before sowing the crop seeds, or it may be applied at the same time as sowing the crop seeds or after sowing. Specifically, examples of the number of times compound A can be applied include once before, at the same time as, or after sowing the crop seeds; twice excluding before sowing; twice excluding at the same time as sowing; or three times, applied at any of the following timings: before sowing, at the same time as, or after sowing the crop seeds. When compound A is applied before sowing crop seeds, it is preferably applied 50 days before sowing to immediately before sowing, more preferably 30 days before sowing to immediately before sowing, more preferably 20 days before sowing to immediately before sowing, and even more preferably 10 days before sowing to immediately before sowing. When compound A is applied after sowing crop seeds, it is usually applied immediately after sowing to before flowering. More preferably, compound A is applied immediately after sowing to before germination and during the period when the crop has 1 to 6 true leaves. The application of compound A simultaneously with sowing crop seeds refers to cases where the seeding machine and sprayer are integrated.

[0020] In the method of the present invention, one or more other herbicides and phytotoxicity reducers may be used in combination with the application of compound A. Here, "combined application" includes tank mix, premix, and sequential application, and in the case of sequential application, the order of application is not particularly limited.

[0021] In the method of the present invention, examples of herbicides that can be used in combination with compound A include potassium glyphosate salt, glyphosate dimethylamine salt, glyphosate monoethanolamine salt, glufosinate ammonium salt, glufosinate P ammonium salt, glyphosate isopropylammonium salt, 2,4-D choline salt, 2,4-D trolamine salt, 2,4-D 2-ethylhexyl, pyroxasulfone, dicambadiglycolamine salt, dicamba biproamine, flumicrolac pentyl, saflufenacil, trifludimoxazine, flumioxazine, epiriphenacil, cretodym, homesaphen, lactofen, mesotrione, tenbotrione, diflufenican, icaphorine methyl, quizaropop P ethyl, haloxyhop methyl, haloxyhop P methyl, and methoproxybicyclon. In the method of the present invention, examples of drug-induced harm reduction agents that can be used in combination with compound A include aridocrol, benoxacol, croquintoset, croquintosetmexyl, siomethrinyl, cyprosulfamide, dichlormid, dicyclonone, dimepiperate, disulfon, dimuron, fenchlorazole, fenchlorazole ethyl, fenchlorim, flurazole, flirazole, fluxofenim, hexime, and isoxadifen Examples include isoxadifen ethyl, diekaowan, diekaoxy, mecoprop, mefenapyl, mefenapyl ethyl, mefenapyl diethyl, mefenate, metcamifen, oxavethrinyl, 1,8-naphthalic anhydride, 1,8-octamethylenediamine, AD-67, MCPA, CL-304415, CSB, DKA-24, MG191, MG-838, PPG-1292, R-28725, R-29148, and TI-35.

[0022] In the method of the present invention, herbicides that can be used in combination with compound A are particularly preferably glyphosate potassium salt, crethodym, haloxyfop-methyl, haloxyfop-P-methyl, methoproxybicyclon, 2,4-D-dimethylamine salt, and icaphorin-methyl.

[0023] When other herbicides are used in combination with compound A, the ratio of the other herbicide to compound A is usually in the range of 0.01 to 1000 times by weight, preferably 0.1 to 300 times. Specific examples of the ratio of other herbicides to compound A include, by weight, 0.1 times, 0.2 times, 0.3 times, 0.4 times, 0.5 times, 0.6 times, 0.7 times, 0.8 times, 0.9 times, equal amounts, 1.2 times, 1.5 times, 1.7 times, 2 times, 2.5 times, 3 times, 4 times, 5 times, 7 times, 10 times, 15 times, 20 times, 30 times, 40 times, 50 times, 60 times, 70 times, 80 times, 100 times, 150 times, and 200 times.

[0024] In this specification, when a herbicide is a salt or ester (for example, potassium glyphosate salt or haloxyfop-methyl), unless otherwise specified, its weight refers to the acid equivalent.

[0025] The following are, but are not limited to, specific, preferred combinations of compound A with one or more herbicides. In this paragraph, the numbers in parentheses represent preferred application rates (g / ha). Compound X1(80) + Glyphosate potassium salt(1080) Compound X1(80) + Cretodime(200) Compound X1(80) + Haloxyfop-methyl(100) Compound X1(80) + Haloxyfop-methyl(100) Compound X1(80) + Methoxybicyclon(100) This compound X1(80) + 2,4-D dimethylamine salt (1065) Compound X1(80) + Icaphorinmethyl(100) Compound X2(20) + Glyphosate potassium salt (1080) This compound X2(20) + Cretodime(200) Compound X2(20) + Haloxyfop-methyl(100) Compound X2(20) + Haloxyfop P-methyl(100) Compound X2(20) + Methoxybicyclon(100) This compound X2(20) + 2,4-D dimethylamine salt (1065) Compound X2(20) + Icaphorinmethyl(100) Compound X3(20) + Glyphosate potassium salt (1080) This compound X3(20) + Cretodime(200) Compound X3(20) + Haloxyfop-methyl(100) Compound X3(20) + Haloxyfop P-methyl(100) Compound X3(20) + Methoxybicyclon(100) This compound X3(20) + 2,4-D dimethylamine salt (1065) Compound X3(20) + Icaphorinmethyl(100) This compound X4(80) + potassium glyphosate salt (1080) This compound X4(80) + Cretodime(200) Compound X4(80) + Haloxyfop-methyl(100) Compound X4(80) + Haloxyfop-methyl(100) Compound X4(80) + Methoxybicyclon(100) This compound X4(80) + 2,4-D dimethylamine salt (1065) This compound X4(80) + ichafolinmethyl(100) This compound X5(80) + glyphosate potassium salt (1080) This compound X5(80) + Cretodime(200) Compound X5(80) + Haloxyfop-methyl(100) This compound X5(80) + Haloxyfop P-methyl(100) This compound X5(80) + methoproxibicyclon(100) This compound X5(80) + 2,4-D-dimethylamine salt (1065) This compound X5(80) + ichafolinmethyl(100) This compound X6(20) + glyphosate potassium salt (1080) This compound X6(20) + Cretodime(200) Compound X6(20) + Haloxyfop-methyl(100) This compound X6(20) + Haloxyfop P-methyl(100) Compound X6(20) + Methoxybicyclon(100) This compound X6(20) + 2,4-D dimethylamine salt (1065) This compound X6(20) + ichafolinmethyl(100) This compound X7(20) + glyphosate potassium salt (1080) This compound X7(20) + Cretodime(200) Compound X7(20) + Haloxyfop-methyl(100) This compound X7(20) + Haloxyfop P-methyl(100) Compound X7(20) + Methoxybicyclon(100) This compound X7(20) + 2,4-D dimethylamine salt (1065) This compound X7(20) + ichafolinmethyl(100) This compound X8(20) + glyphosate potassium salt (1080) This compound X8(20) + Cretodime(200) This compound X8(20) + Haloxyfop-methyl(100) This compound X8(20) + Haloxyfop P-methyl(100) This compound X8(20) + methoproxibicyclon(100) This compound X8(20) + 2,4-D dimethylamine salt (1065) This compound X8(20) + ichafolinmethyl(100) [Examples]

[0026] The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

[0027] First, the following examples illustrate the criteria for evaluating herbicidal efficacy and phytotoxicity to crops.

[0028] [Herbicide effectiveness] The herbicidal efficacy is evaluated by classifying the results from 0 to 100, with "0" indicating no difference or almost no difference in the emergence or growth state of the test weeds compared to the untreated group, and "100" indicating complete death of the test plants or complete suppression of emergence or growth. [Damage to crops caused by phytotoxicity] The assessment of phytotoxicity to crops is indicated as follows: "harmless" if little to no phytotoxicity is observed, "minor" if mild phytotoxicity is observed, "medium" if moderate phytotoxicity is observed, and "major" if severe phytotoxicity is observed.

[0029] Example 1 Glyphosate-resistant Digitaria sanguinalis was sown in plastic pots filled with soil and cultivated in a greenhouse for 43 days. A mixture (hereinafter referred to as Mixture X) was prepared by dissolving 5 parts of Compound X2, Compound X3, or Compound X5 in 95 parts of Mixture X to prepare an emulsion. The prescribed amount of each emulsion was mixed with water containing 1% by volume of a spreading agent (Agri-Dex (crop oil concentrate), manufactured by Helena) to prepare a spray solution. The spray solution was then applied to the foliage of the Japanese dwarf crabgrass at a rate of 216 L per hectare, according to the prescribed application rate. The herbicidal efficacy against the Japanese dwarf crabgrass was visually evaluated 21 days after application.

[0030] [Table 1] [Industrial applicability]

[0031] The present invention provides an efficient method for controlling the Japanese pampas grass (Digitaria sanguinalis).

Claims

1. A method for controlling Digitaria sanguinalis, comprising applying at least one compound selected from the following group (A) to Digitaria sanguinalis or to a place where Digitaria sanguinalis grows. Group (A): The following formula (1) The compound shown, The following formula (2) The compound shown, The following formula (3) The compound shown, The following formula (4) The compound shown, The following formula (5) The compound shown, The following formula (6) The compound shown, The following formula (7) The compounds shown, and The following formula (8) A group consisting of compounds represented by [the symbol].

2. The control method according to claim 1, wherein the aforementioned Japanese grass (Digitaria sanguinalis) is resistant to glyphosate.

3. The control method according to claim 1, wherein the place where the aforementioned Japanese pampas grass grows is a cultivation area for corn, soybeans, and cotton.

4. The control method according to claim 1, wherein the place where the aforementioned Japanese pampas grass grows is a soybean cultivation area.

5. The pest control method according to claim 1, wherein the application rate of at least one compound selected from the group (A) is 10 to 100 grams per hectare.

6. The pest control method according to claim 1, wherein at least one compound selected from the group (A) is the compound represented by formula (2).

7. Use of at least one compound selected from the following group (A) to control the Japanese grass (Digitaria sanguinalis). Group (A): The following formula (1) The compound shown, The following formula (2) The compound shown, The following formula (3) The compound shown, The following formula (4) The compound shown, The following formula (5) The compound shown, The following formula (6) The compound shown, The following formula (7) The compounds shown, and The following formula (8) A group consisting of compounds represented by [the symbol].

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