Weeding composition and application thereof

Abstract

The invention relates to the technical field of pesticides, and discloses a weeding composition and application thereof. The effective components of the weeding composition comprise the flufenacet, the flumioxazin and the diflufenican. The weeding composition can be used for preventing and treating weeds in wheat fields. The weeding composition provided by the invention is used for preventing and killing weeds such as alopecurus macrostachyus and lolium multiflorum in a wheat field, has a surprising and unexpected synergistic effect, and has more remarkable weeding activity than the expected sum of the activity of a single herbicide and the activity of a single herbicide or the activity of a combination of any two herbicides, so that the weeding composition is a novel weeding composition for preventing and killing weeds such as alopecurus macrostachyus and lolium multiflorum. The synergistic effect is more remarkable under the condition of low dosage, the dosage can be reduced, the pollution to the environment is reduced, the agricultural cost is reduced through reasonable compounding, and the bactericidal composition has a better application prospect.

Description

Technical Field

[0001] This invention relates to the field of pesticide technology, specifically to a herbicidal composition and its application. Background Technology

[0002] With the widespread use of herbicides in wheat fields over many years, herbicide resistance in wheat fields has developed rapidly. In some areas, weeds have even developed cross-resistance to multiple herbicides. For example, *Lysimachia christinae*, *Alopecurus japonicus*, and *Alopecurus aequalis* have all developed cross-resistance to mesosulfuron-methyl and clodinafop-propargyl. Currently, single herbicides are no longer sufficient to control the damage caused by mixed weeds. Therefore, herbicide mixing is receiving increasing attention. Herbicide mixing can broaden the weed control spectrum, improve weed control efficacy, extend the application period, reduce crop damage, reduce dosage and residual toxicity, and delay the development of resistance. Therefore, herbicide compounding is an important approach for future product development.

[0003] CN101528041A discloses a herbicidal combination that is applied simultaneously or in any order to the desired site for control, such as to unwanted plants or their locations. The combination comprises one or more of (A) propyzoxystrobin and (B) bensulfuron-methyl, cyclohexane, pendimethalin, pyrifluquinazon, flupyrimisulfuron, fensulfuron-methyl, metsulfuron-methyl, fluthiamethoxam, and pyrimisulfuron. CN112155015A discloses a composition containing fluthiamethoxam and pyrifluquinazon, its preparation method, and its application. The composition comprises fluthiamethoxam and pyrifluquinazon in a weight ratio of (5-30):(15-30).

[0004] The prior art does not disclose that the ternary herbicidal composition containing fluthiamethoxam, propyzoxystrobin, and pyrfluthrin has a synergistic effect on weeds. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems existing in the prior art and to provide a weed control composition and its application.

[0006] The inventors were pleasantly surprised to discover during their research on the combined use of fluthiamethoxam, propyzoxystrobin, and pyrfluthrin that these three compounds exhibited a significant synergistic effect against weeds. Mixing them within a certain ratio range can broaden the weed control spectrum and improve weed control efficacy.

[0007] To achieve the above objectives, a first aspect of the present invention provides a herbicidal composition, wherein the active ingredients of the herbicidal composition include fluthiamethoxam, propyzoxystrobin, and pyrfluthrin.

[0008] A second aspect of the present invention provides the application of the herbicidal composition described in the first aspect in controlling weeds in wheat fields.

[0009] A third aspect of the present invention provides a method for applying the herbicidal composition described in the first aspect, wherein the herbicidal composition is applied by pre-emergence soil sealing treatment.

[0010] The beneficial technical effects achieved by the present invention through the above technical solution are as follows:

[0011] The herbicidal composition provided by this invention is used to control weeds such as Alopecurus aequalis and Lernaea perlatum in wheat fields. It has a surprising and unexpected synergistic effect, and its herbicidal activity is more significant than the expected sum of the activities of using a single herbicide, as well as the activity of a single herbicide or a combination of any two herbicides. This synergistic effect is more significant at low doses, which can reduce the amount of herbicide used and reduce environmental pollution. Moreover, reasonable compounding reduces agricultural costs and has good application prospects.

[0012] The herbicidal composition of this invention can be applied by whole-field soil spraying, aerial application, or mechanical spraying. When using this herbicidal composition, in addition to using the active ingredient directly, the composition containing the target active ingredient can be formulated, or the active ingredients can be formulated separately and then mixed. Other herbicides can also be added for mixing. During application, the active ingredients of this invention can be applied separately or simultaneously, offering flexibility and convenience. Detailed Implementation

[0013] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0014] The first aspect of the present invention provides a herbicidal composition, wherein the active ingredients of the herbicidal composition include fluthiamethoxam, propyzoxystrobin, and pyrfluthrin.

[0015] The herbicidal composition provided by this invention has high weed control efficacy, low dosage, long-lasting effect (over 99 days), and broad spectrum of weed control. It can be used in wheat fields to control annual weeds such as Alopecurus aequalis, Lorraus multiflorus, Alopecurus japonicus, Alopecurus aequalis, Alopecurus aequalis, Poa annuus, Ophiopogon japonicus, Okra, Jointed oats, Stellaria media, Capsella bursa-pastoris, Veronica persica, Desmodium styracifolium, Galium aparine, Gynostemma pentaphyllum, and Stellaria media.

[0016] In some embodiments of the present invention, the weight ratio of fluthiamethoxam, propyzoxystrobin, and pyrfluthrin is 2-8:0.5-2:2-8, preferably 2-8:0.5-1:2-4, preferably 4-8:1:2-4, or 2-4:1:2-4, or 3-6:1:2-8, or 6-8:1:2-4.

[0017] In some embodiments of the present invention, the weight ratio of fluthiamethoxam, propyzoxystrobin, and pyrifluquinazon is 4:1:4, 4:1:8, 2:1:2, 2:1:4, 8:1:4, 8:1:8, 8:1:2, 8:1:8, 7:1:3, 7:1:4, 6:1:4, 6:1:3, 3:1:2, or 4:1:2. The present invention includes any value within the range of any two of the above values.

[0018] In some embodiments of the present invention, the active ingredient accounts for 3-80% of the total weight of the herbicidal composition, for example 3%, 10%, 20%, 33%, 50%, 60%, 70%, 80%, and any value within the range of any two of the above values, preferably 15-50%.

[0019] In some embodiments of the present invention, the herbicidal composition is formulated as any one of a dispersible oil suspension, an aqueous suspension, a suspension emulsion, a wettable powder, an emulsifiable concentrate, a water-dispersible granule, an emulsion, or a microemulsion.

[0020] In some embodiments of the invention, the herbicidal composition further includes pesticide-acceptable adjuvants.

[0021] In some embodiments of the present invention, the pesticide-acceptable excipients include one or more of dispersants, wetting agents, thickeners, antifreeze agents, defoamers, preservatives, and solvents.

[0022] In some embodiments of the present invention, the dispersant is selected from one or more of alkyl naphthalene sulfonates, methacrylate copolymers, lignin sulfonates, and polycarboxylates.

[0023] In some embodiments of the present invention, the wetting agent is selected from one or more of sodium alkyl sulfate, calcium alkylbenzene sulfonate, sodium alkylbenzene sulfonate, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, and polyoxyethylene ether phosphate and their salts.

[0024] In some embodiments of the present invention, the antifreeze is selected from one or more of ethylene glycol, propylene glycol, glycerol, and urea.

[0025] In some embodiments of the present invention, the thickener is selected from one or more of silica, magnesium aluminum silicate, sodium carboxymethyl cellulose, xanthan gum, gelatin and gum arabic.

[0026] In some embodiments of the present invention, the defoamer is selected from one or more of organosilicon, polyether and fatty alcohol.

[0027] In some embodiments of the present invention, the preservative is selected from isothiazolin-3-one preservatives, preferably one or more of 1,2-phenylpropiothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one, and 2-methyl-4-isothiazolin-3-one.

[0028] In some embodiments of the present invention, the solvent is selected from one or more of water, aromatic hydrocarbons, alcohols, ketones, amides and esters, preferably water.

[0029] In some embodiments of the invention, the herbicidal composition is used to control weeds in wheat fields. The wheat fields include winter wheat fields and spring wheat fields.

[0030] In some embodiments of the present invention, the weeds are annual weeds, including grass weeds and broadleaf weeds.

[0031] In some embodiments of the present invention, the grass weeds are selected from at least one of the following: large spike grass, multiflora ryegrass, Japanese grass, barnyard grass, grass, barnyard grass, annual bluegrass, wild oat, and jointed goatgrass.

[0032] In some embodiments of the present invention, the broadleaf grass is selected from at least one of chickweed, shepherd's purse, speedwell, shepherd's purse, cleavers, sagebrush, and stellaria.

[0033] The second aspect of the present invention provides the application of the herbicidal composition described in the first aspect in controlling weeds in wheat fields.

[0034] In some embodiments of the present invention, the weeds are annual weeds, including grass weeds and broadleaf weeds.

[0035] In some embodiments of the present invention, the grass weeds are selected from at least one of the following: large spike grass, multiflora ryegrass, Japanese grass, barnyard grass, grass, barnyard grass, annual bluegrass, wild oat, and jointed goatgrass.

[0036] In some embodiments of the present invention, the broadleaf grass is selected from at least one of chickweed, shepherd's purse, speedwell, shepherd's purse, cleavers, sagebrush, and stellaria.

[0037] A third aspect of the present invention provides a method for applying the herbicidal composition described in the first aspect, wherein the herbicidal composition is applied by pre-emergence soil sealing treatment.

[0038] In some embodiments of the present invention, the effective ingredient of the herbicidal composition is applied at an amount of 105-645 g ai. / ha, preferably 135-450 g ai / ha.

[0039] In some embodiments of the present invention, the application rate of fluthiamethoxam is 45-450 g ai / ha, preferably 60-300 g ai / ha.

[0040] In some embodiments of the present invention, the application rate of propyzamide is 15-45 g ai / ha, preferably 15-30 g ai / ha.

[0041] In some embodiments of the present invention, the application rate of pyrifluquinazon is 45-150 g ai / ha, preferably 60-120 g ai / ha.

[0042] When using this herbicidal composition, in addition to using the active ingredient directly, the composition containing the target active ingredient can be formulated, or the active ingredients can be formulated separately and then mixed. During application, the active ingredients of this invention can be applied separately or simultaneously.

[0043] I. Methods and Standards for Determining Herbicidal Activity

[0044] 1. Bioassay Test Methods:

[0045] Refer to the "Guidelines for Indoor Bioassay Tests of Pesticides.NY / T 1155.3-2006" Herbicides Part 3: Activity Assay Test Soil Spray Method.

[0046] The fluthiamethoxam, propyzoxystrobin, and pyrfluthrin of the present invention can be obtained commercially.

[0047] In the following tests, 98% fluthiamethoxam technical grade was sourced from Luzhou Dongfang Agrochemical Co., Ltd.; 99.2% propyzamide technical grade was sourced from Max (Rudong) Chemical Co., Ltd.; and 98% pyrifluquinazon technical grade was sourced from Jiangsu Provincial Agricultural Hormone Engineering Technology Research Center Co., Ltd. 41% fluthiamethoxam suspension concentrate was produced by Max (Rudong) Chemical Co., Ltd.; 41% pyrifluquinazon suspension concentrate was produced by Weifang Zhongnong United Chemical Co., Ltd.; and 50% propyzamide wettable powder was produced by Weifang Xianda Chemical Co., Ltd.

[0048] Preparation of the medicine solution:

[0049] Technical grade herbicide: Accurately weigh a certain mass of herbicide technical grade, dissolve and dilute it with DMF (dimethylformamide) to a 1% stock solution, and dilute it with distilled water containing 0.1% Tween-80 to the test dose according to the set dosage for treatment.

[0050] Preparation: Dissolve and dilute the preparation with water to a 1% stock solution, and then dilute it with distilled water to the test dose according to the set dosage for treatment.

[0051] 2. Evaluation Criteria for Herbicidal Activity and Crop Safety by Visual Inspection

[0052] The herbicidal activity was visually assessed based on the degree of plant damage symptoms (inhibition, deformity, yellowing, whitening). 0 indicates no herbicidal effect, and 100% indicates complete killing of weeds. The evaluation criteria for the visual method are shown in Table 1.

[0053] Table 1 Evaluation Criteria for Herbicidal Activity by Visual Inspection

[0054]

[0055] The herbicidal activity or safety is evaluated using the plant number inhibition rate, calculated using the following formula:

[0056]

[0057] Crop safety is evaluated by visual inspection: based on the symptoms of damage to the target crop, 0 indicates safety, and 51-100 indicates very poor safety and serious phytotoxicity. The evaluation indicators are shown in Table 2 below.

[0058] Table 2 Standards for evaluating pesticide damage

[0059] Severity of pesticide damage (%) Result description 0 Safe and free of pesticide damage 1-10 No obvious phytotoxicity 11-30 Minor phytotoxicity 31-50 Moderate pesticide damage 51-100 Severe pesticide damage

[0060] II. Evaluation Test of Combined Effects

[0061] To verify the synergistic effects of the herbicidal compositions on weeds, indoor tests were conducted on the technical grade compositions. Greenhouse pot experiment activity assays were performed to compare the herbicidal activities of different ratios of fluthiamethoxam, propyzoxystrobin, and pyrifluquinazon compositions with single active ingredients and binary compositions.

[0062] Experimental target: Alopecurus myosuroides Huds., the weed seeds were collected from wheat fields and stored indoors.

[0063] Experimental Methods: A greenhouse pot treatment method was used. A measured amount of soil was placed in a plastic pot, and 5-10 seeds of the target weeds were sown on the soil surface. The pots were covered with 0.5-1 cm of fine soil and then placed in a greenhouse for cultivation. Pre-emergence soil spraying was performed after sowing. Each treatment was replicated four times, with a control treatment (without pesticides). After treatment, the plants were placed in a greenhouse for cultivation, and the growth of the target weeds was observed regularly. The overall herbicidal activity was visually assessed 30 days after treatment.

[0064] The herbicidal activity of the mixed herbicides was tested using the Colby method, i.e., E0 = XYZ / 10000. In this formula, X is the weed survival rate of herbicide A at dosage P; Y is the weed survival rate of herbicide B at dosage Q; Z is the weed survival rate of herbicide C at dosage W; and E0 is the theoretical weed survival rate of herbicides (A+B+C) at dosage (P+Q+W).

[0065] E represents the actual weed survival rate for each treatment. According to the Colby method, when E0-E>10%, it indicates that the herbicide mixture has a synergistic effect; when E0-E<-10%, it indicates that the herbicide mixture has an antagonistic effect; and when the E0-E value is between ±10%, it indicates that the herbicide mixture has an additive effect.

[0066] Table 3 shows the evaluation results of the herbicidal activity and combined effect of different ratios of fluthiamethoxam, propyzoxystrobin, and pyrfluthrin on wheat field *Alopecurus aequalis*, where A represents fluthiamethoxam; B represents propyzoxystrobin; and C represents pyrfluthrin.

[0067]

[0068] Table 3 shows that the weed control efficacy of the mixture of fluthiamethoxam, propyzoxystrobin, and pyrifluquinazon was higher than that of the three single active ingredients and the binary combination, indicating a significant improvement in herbicidal activity. The evaluation results of the combined effects of the herbicides showed that the survival rate difference E0-E values ​​of the herbicide compositions at the ratio of (15-60)+(3.75-7.5)+(15-30) (i.e., 2-8:0.5-1:2-4) was greater than 10%, indicating a synergistic effect.

[0069] III. Examples and Efficacy Determination of Herbicidal Compositions

[0070] The herbicidal compositions in the following examples and comparative examples were prepared directly from the technical grade drug or by mixing the formulation in a tank.

[0071] Example 1

[0072] In this embodiment, fluthiamethoxam, propyzoxystrobin, and pyrfluthrin technical materials are used in a mass ratio of 4:1:4.

[0073] Example 2

[0074] In this embodiment, fluthiamethoxam, propyzoxystrobin, and pyrfluthrin technical materials are used in a mass ratio of 4:1:8.

[0075] Example 3

[0076] In this embodiment, fluthiamethoxam, propyzoxystrobin, and pyrfluthrin technical materials are used in a mass ratio of 16:1:4.

[0077] Example 4

[0078] In this embodiment, fluthiamethoxam, propyzoxystrobin, and pyrfluthrin technical materials are used in a mass ratio of 16:1:8.

[0079] Examples 5-1, 5-2, 5-3, 5-4, 5-5, 5-6

[0080] This embodiment uses a tank mixture of 41% fluthiamethoxam suspension concentrate, 50% propyne fluthiamethoxam wettable powder, and 41% pyrifluquinazon suspension concentrate.

[0081] Example 6

[0082] This example is a formulation: 33% fluthiamethoxam·propyzoxystrobin·pyrfluthrin SC; effective ingredient ratio: 10:1.5:5.

[0083]

[0084] Example 7

[0085] This embodiment is a formulation, 50% fluthiamethoxam·propyzoxystrobin·pyrfluthrin WDG; effective component ratio: 6:1:3.

[0086]

[0087]

[0088] Example 8

[0089] This example is a formulation: 20% fluthiamethoxam·propyzoxystrobin·pyrfluthrin SC; effective ingredient ratio: 5:1:4.

[0090] Components Mass ratio (%) Remark Fluthiamethoxam 10 Active ingredients propyzamide 2 Active ingredients Pyrfluthrin 8 Active ingredients Atlox 4913 methacrylate polymer 4 Dispersant, purchased from Croda Ufoxane 3A Sodium Lignosulfonate 3 Dispersant, purchased from Paulig. Propylene glycol 5 antifreeze precipitate 1 Thickener Xanthan Gum 0.2 Thickener BIT (1,2-phenylpropisothiazolin-3-one) 0.1 preservative Sag 630 silicone 0.3 Defoamer, purchased from Momentive. water 66.4 solvent

[0091] Example 9

[0092] This example is a formulation: 50% fluthiamethoxam·propyne fluthiamethoxam·pyrfluthiamethoxam WP; effective ingredient ratio: 2:1:4.

[0093]

[0094] Comparative Examples 1-1, 1-2, 1-3, 1-4, 1-5, 1-6

[0095] Comparative Examples 1-1 and 1-2 used fluthiamethoxam technical grade; Comparative Examples 1-3, 1-4, 1-5, and 1-6 used 41% fluthiamethoxam suspension concentrate.

[0096] Comparative Examples 2-1, 2-2, 2-3

[0097] Comparative Examples 2-1 and 2-2 used pyrfluthrin technical grade; Comparative Example 2-3 used 41% pyrfluthrin suspension concentrate.

[0098] Comparative Examples 3-1, 3-2, 3-3, 3-4

[0099] Comparative Examples 3-1 and 3-2 used propyne fluroxypyr technical grade; Comparative Examples 3-3 and 3-4 used 50% propyne fluroxypyr wettable powder.

[0100] Comparative Example 4

[0101] This comparative example uses fluthiamethoxam and propyzoxystrobin technical grade pesticides in a mass ratio of 2:1.

[0102] Comparative Example 5

[0103] This comparative example uses propyzamide and pyrfluzamide technical materials in a mass ratio of 1:2.

[0104] Comparative Example 6

[0105] This comparative example uses fluthiamethoxam and pyrifluquinazon technical grade pesticides in a mass ratio of 1:1.

[0106] Comparative Example 7

[0107] This comparative example uses fluthiamethoxam, propyzoxystrobin, and pyrfluthrin technical grade pesticides in a mass ratio of 1:1:4.

[0108] Comparative Example 8

[0109] This comparative example uses fluthiamethoxam, propyzoxystrobin, and pyrfluthrin technical grade pesticides in a mass ratio of 1:2:1.

[0110] Comparative Examples 9-1, 9-2, 9-3, 9-4

[0111] This comparative example uses a tank mix of 41% fluthiamethoxam suspension concentrate and 41% pyrifluquinazon suspension concentrate.

[0112] Comparative Examples 10⁻¹, 10⁻², 10⁻³, 10⁻⁴, 10⁻⁵, 10⁻⁶

[0113] This comparative example uses a tank mix of 41% fluthiamethoxam suspension concentrate and 50% propyne fluthiamethoxam wettable powder.

[0114] Comparative Examples 11-1 and 11-2

[0115] This comparative example uses a tank mix of 41% pyrfluthrin suspension concentrate and 50% propyzamide wettable powder.

[0116] Test Example 1: Comparative Test of Herbicidal Activity

[0117] The herbicidal activity characteristics of the herbicidal composition were determined by conducting indoor activity assays.

[0118] Experimental targets: Japanese wild oats (Alopecurus japonicus), multiflora ryegrass (Lolium multiflorum), and sedge (Beckmannia syzigachne). Weed seeds were collected from wheat fields and stored indoors.

[0119] Experimental Method: A greenhouse pot treatment method was used. A measured amount of soil was placed in a plastic pot, and approximately 10 seeds of the target weeds were sown on the soil surface. The pots were covered with 0.5-1 cm of fine soil and then placed in a greenhouse for cultivation. Pre-emergence soil spraying was performed after sowing. Each treatment was replicated four times. After treatment, the pots were placed in a greenhouse for cultivation, and the growth of the target weeds was observed regularly. The overall herbicidal activity was visually assessed 30 days after treatment.

[0120] Table 4 shows the results of comparative tests on the herbicidal activity of the herbicidal compositions of each example and comparative example.

[0121] Table 4

[0122]

[0123]

[0124] This experiment used the herbicidal compositions provided in Examples 1-4 and Comparative Examples 1-8. As shown in Table 4, the herbicides provided in Examples 1-4 showed herbicidal activity of 81-100% against Japanese wild oats, wild clover, and ryegrass, which were all superior to the comparative examples.

[0125] Test Example 2: Field Plot Efficacy Test

[0126] To clarify the field application effect of the composition, a field efficacy test of the composition in wheat fields was carried out in accordance with the guidelines for field efficacy testing of pesticides (GB-T17980.41-2000).

[0127] The experiment was conducted in Baoying County, Yangzhou City, Jiangsu Province. The field grass was mainly large-spike wild oats. Soil sealing treatment was applied before wheat emergence after sowing, with a water volume of 60L / mu. Each plot was 24 square meters, and the experiment was replicated three times.

[0128] Table 5 shows the results of weed control tests (inhibition rate %) of various herbicides or herbicidal compositions on wheat fields.

[0129] Table 5

[0130]

[0131]

[0132] Table 5 shows that the ternary combination treatment of fluthiamethoxam + propyzoxystrobin + pyrfluthrin had no adverse effects on wheat growth. Weed control results indicate that the ternary combination of fluthiamethoxam + propyzoxystrobin + pyrfluthrin showed better control of large-spike alopecuroides, with a longer residual effect, significantly superior to single-agent treatments of fluthiamethoxam, pyrfluthrin, and propyzoxystrobin, and also superior to binary combinations; moreover, the ternary combination can reduce pesticide dosage. Therefore, this combination is safe for wheat, has high weed control efficacy, and shows good application prospects.

[0133] Test Example 3: Field Demonstration Trial

[0134] The experiment was conducted in Runan County, Zhumadian City, Henan Province. The field grasses were mainly ryegrass, shepherd's purse, and speedwell. Soil sealing treatment was applied before wheat emergence after sowing, with a water volume of 60L / mu. Each plot was 120 square meters, and there were no replicates.

[0135] Table 6 shows the results of weed control experiments (inhibition rate %) for each treatment on wheat fields.

[0136] Table 6

[0137]

[0138] Table 6 shows that the combination of fluthiamethoxam-propyzoxystrobin-pyrfluthrin has good safety for wheat and excellent control efficacy against weeds such as ryegrass, shepherd's purse, and speedwell, with a residual effect of more than 90 days.

[0139] Test Example 4: Field Demonstration Trial

[0140] The experiment was conducted in Handai Town, Xinle City, Hebei Province. The field vegetation consisted mainly of wild oats, jointed goatgrass, and cleavers. Soil sealing treatment was applied before wheat emergence after sowing, with a water volume of 60L / mu. Each plot was 100 square meters, and there were no replicates.

[0141] Table 7 shows the results of weed control experiments on wheat fields for each treatment (inhibition rate %).

[0142] Table 7

[0143]

[0144] Table 7 shows that the combination of fluthiamethoxam-propyzoxystrobin-pyrfluthrin has good safety for wheat and excellent control efficacy against weeds such as wild oats, jointed goatgrass, and cleavers, with a residual effect of more than 100 days.

[0145] Test Example 5: Field Demonstration Trial

[0146] The experiment was conducted in Rudong County, Nantong City, Jiangsu Province. The field vegetation consisted mainly of Alopecurus aequalis and Stellaria media. Soil sealing treatment was applied before wheat emergence after sowing, with a water volume of 60L / mu. Each plot was 100 square meters, and there were no replicates.

[0147] Table 8 shows the results of weed control trials (inhibition rate %) for each treatment in wheat fields.

[0148] Table 8

[0149]

[0150]

[0151] Table 8 shows that the combination of fluthiamethoxam-propyzoxystrobin-pyrfluthrin has good safety for wheat and excellent control efficacy against weeds such as wild oats and chickweed, with a residual effect of more than 90 days.

[0152] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A herbicidal composition, characterized in that, The active ingredients of the herbicidal composition include fluthiamethoxam, propyzoxystrobin, and pyrfluthrin.

2. The herbicidal composition according to claim 1, wherein, The weight ratio of fluthiamethoxam, propyzoxystrobin, and pyrifluquinazon is 2-8:0.5-2:2-8, preferably 2-8:0.5-1:2-4, more preferably 4-8:1:2-4, or 2-4:1:2-4, or 3-6:1:2-8, or 6-8:1:2-4.

3. The herbicidal composition according to claim 1 or 2, wherein, The weight ratio of fluthiamethoxam, propyzoxystrobin, and pyrfluthrin is 4:1:4, 4:1:8, 2:1:2, 2:1:4, 8:1:4, 8:1:8, 8:1:2, 8:1:8, 7:1:3, 7:1:4, 6:1:4, 6:1:3, 3:1:2, or 4:1:

2.

4. The herbicidal composition according to any one of claims 1-3, wherein, The active ingredient accounts for 3-80% of the total weight of the herbicidal composition, preferably 15-50%.

5. The herbicidal composition according to any one of claims 1-4, wherein, The herbicidal composition is formulated as any one of the following: dispersible oil suspension, aqueous suspension, emulsion, wettable powder, emulsifiable concentrate, water-dispersible granules, emulsion, or microemulsion.

6. The herbicidal composition according to any one of claims 1-5, characterized in that, The herbicide composition also includes pesticide-acceptable excipients; Preferably, the pesticide-acceptable excipients include one or more of the following: dispersants, wetting agents, thickeners, antifreeze agents, defoamers, preservatives, and solvents; Preferably, the dispersant is selected from one or more of alkyl naphthalene sulfonates, methacrylate copolymers, lignin sulfonates, and polycarboxylates; Preferably, the wetting agent is selected from one or more of sodium alkyl sulfate, calcium alkylbenzene sulfonate, sodium alkylbenzene sulfonate, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, and polyoxyethylene ether phosphate and their salts. Preferably, the antifreeze is selected from one or more of ethylene glycol, propylene glycol, glycerol and urea; Preferably, the thickener is selected from one or more of silica, magnesium aluminum silicate, sodium carboxymethyl cellulose, xanthan gum, gelatin and gum arabic; Preferably, the defoamer is selected from one or more of organosilicon, polyether, and fatty alcohol compounds; Preferably, the preservative is selected from isothiazolin-3-one preservatives, and more preferably from one or more of 1,2-phenylpropiothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one; Preferably, the solvent is selected from one or more of water, aromatic hydrocarbons, alcohols, ketones, amides and esters, with water being the most preferred.

7. The herbicidal composition according to any one of claims 1-6, wherein, The herbicidal composition is used to control weeds in wheat fields; Preferably, the weeds are annual weeds, including grasses and broadleaf grasses; Preferably, the grass weeds are selected from at least one of the following: large spike grass, multiflora ryegrass, Japanese grass, barnyard grass, grass, barnyard grass, annual bluegrass, wild oat, and jointed goatgrass; Preferably, the broadleaf grass is selected from at least one of the following: chickweed, shepherd's purse, speedwell, shepherd's purse, cleavers, sedge, and stellaria.

8. The use of the herbicidal composition according to any one of claims 1-7 in controlling weeds in wheat fields; Preferably, the weeds are annual weeds, including grasses and broadleaf grasses; Preferably, the grass weeds are selected from at least one of the following: large spike grass, multiflora ryegrass, Japanese grass, barnyard grass, grass, barnyard grass, annual bluegrass, wild oat, and jointed goatgrass; Preferably, the broadleaf grass is selected from at least one of the following: chickweed, shepherd's purse, speedwell, shepherd's purse, cleavers, sedge, and stellaria.

9. A method for applying the herbicidal composition according to any one of claims 1-7, characterized in that, The herbicidal composition was applied as a pre-emergence soil sealing treatment.

10. The application method according to claim 9, wherein, The effective ingredient of the herbicidal composition is applied at a rate of 105-645 g ai / ha, preferably 135-450 g ai / ha; Preferably, the application rate of fluthiamethoxam is 45-450 g ai / ha, and more preferably 60-300 g ai / ha; Preferably, the application rate of propyzamide is 15-45 g ai / ha, more preferably 15-30 g ai / ha; Preferably, the application rate of pyrifluquinazon is 45-150 g ai / ha, and more preferably 60-120 g ai / ha.

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