Weeding composition and application thereof

Abstract

The invention belongs to the technical field of pesticide weeding, and discloses a weeding composition and application thereof.The weeding composition comprises an active ingredient A, an active ingredient B and an active ingredient C. The active ingredient A is saflufenacil, the active ingredient B is nicosulfuron, and the active ingredient C is any one of topramezone or mesotrione; the mass ratio of the active component A to the active component B to the active component C is 1: (0.25-4): (0.25-16). The composition disclosed by the invention is high in safety to crops, accords with a green agriculture trend, and promotes sustainable development and improves comprehensive ecological benefits by delaying resistance and reducing dosage.

Description

Technical Field

[0001] This invention belongs to the field of pesticide weeding technology, and discloses a weeding composition and its application. Background Technology

[0002] Corn is an important food crop in my country. Its growing season coincides with the hot and rainy summer, when weeds grow rapidly in the fields, reaching a coverage rate of 82% to 86%. Corn fields have a variety of weeds, commonly including grasses (tailgrass, crabgrass, goosegrass, barnyard grass, etc.), broadleaf weeds (purslane, amaranth, ironweed, etc.), and sedges (sedge, nutgrass, etc.). Grasses, broadleaf weeds, and sedges are often intermingled in corn fields, and weed damage during the seedling stage can lead to significant yield losses. Currently, chemical control is the most important weed control method in corn fields.

[0003] Saflufenacil is a protoporphyrinogen oxidase (PPO) inhibitor. It disrupts chlorophyll synthesis by preventing the conversion of protoporphyrinogen IV to protoporphyrin IV during chlorophyll biosynthesis, leading to chloroplast pigment bleaching, tissue necrosis, and ultimately, growth inhibition and plant death.

[0004] Nicosulfuron is a sulfonylurea herbicide mainly used in corn fields to control grassy and broadleaf weeds. It has low dosage, good efficacy, and strong compatibility with other herbicides.

[0005] Topramezone is a benzyl ester pyrazolone herbicide that kills weeds by inhibiting 4-hydroxyphenyl pyruvate dioxygenase (HPPD) in plants, interfering with chloroplast synthesis.

[0006] Mesotrione is an HPPD inhibitor herbicide. Its herbicidal activity is manifested through the inhibition of p-hydroxyphenylpyruvate dioxygenase (HPPD). After HPPD is inhibited in weeds, the process of converting p-hydroxyphenylpyruvate to hydantoin is blocked. Tyrosine accumulates and plastoquinone is lacking in the meristematic tissue of weeds, which in turn affects the biosynthesis of carotenoids in the target tissue. After 3-5 days, it causes whitening symptoms in the meristematic and new tissues of weeds, which eventually spread to the whole plant, causing the weeds to whiten and die.

[0007] Cornfields exhibit diverse weed communities, and single herbicides cannot control all weeds throughout the entire corn growth cycle. Rational herbicide mixing can broaden the weed control spectrum, reduce dosage, improve efficacy, decrease pesticide residues, and enhance herbicide application. Furthermore, long-term use of single herbicides can lead to weed resistance. Therefore, the applicant investigated the optimal ternary mixture of bensulfuron-methyl, nicosulfuron, and either benzoxazine or mesotrione to determine the best ratio and control efficacy against common cornfield weeds, providing a new option for chemical weed control in cornfields. Summary of the Invention

[0008] Based on the above, the purpose of this invention is to provide a ternary herbicidal composition containing benzosulfuron, nicosulfuron, and benzosulfuron or mesotrione.

[0009] Another objective of this invention is to provide the above-mentioned ternary herbicidal composition for the control of weeds in corn fields. This herbicidal composition has a significant synergistic effect, expands the weed control spectrum, has a high control effect on resistant weeds, and causes no phytotoxicity to crops.

[0010] To achieve the above objectives, the present invention provides the following technical solution: a herbicidal composition, wherein the active ingredients of the herbicidal composition include active ingredient A, active ingredient B and active ingredient C, wherein active ingredient A is benzosulfuron, active ingredient B is nicosulfuron, and active ingredient C is either benzosulfuron or mesosulfuron, wherein the mass ratio of active ingredient A, active ingredient B and active ingredient C is 1:(0.25-4):(0.25-16), or any value between the above mass ratios.

[0011] Furthermore, the active ingredient C is benzoxazine, and the mass ratio of the active ingredients A, B and C is 1:(0.25-4):(0.25-4), or any value between the above mass ratios;

[0012] The active ingredient C is nicosulfuron, and the mass ratio of active ingredient A to active ingredient B to active ingredient C is 1:(0.5-4):(1-16), or any value between the above mass ratios.

[0013] Furthermore, the active ingredient C is benzoxazine, and the mass ratio of the active ingredients A, B and C is 1:(0.25-4):(0.5-4), or any value between the above mass ratios;

[0014] Furthermore, the active ingredient C is benzoxazine, and the mass ratio of active ingredient A to active ingredient B to active ingredient C is 1:(1-4):(2-4), or any value between the above mass ratios;

[0015] Furthermore, the active ingredient C is nicosulfuron, and the mass ratio of active ingredient A to active ingredient B to active ingredient C is 1:(1-4):(1-16), or any value between the above mass ratios;

[0016] Furthermore, the active ingredient C is nicosulfuron, and the mass ratio of active ingredient A to active ingredient B to active ingredient C is 1:(2-4):(2-16), or any value between the above mass ratios.

[0017] Furthermore, the active ingredients A, B, and C in the herbicidal composition have a mass percentage content of 1-90% in the herbicidal composition;

[0018] Furthermore, the active ingredients A, B, and C in the herbicidal composition have a mass percentage content of 2-85%.

[0019] Furthermore, the herbicidal composition includes, in addition to the active ingredient, agriculturally acceptable auxiliary ingredients selected from one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoamers, solvents, preservatives, stabilizers, synergists, or carriers.

[0020] Furthermore, the herbicidal composition can be prepared into an agriculturally permissible formulation.

[0021] Furthermore, the dosage form is a soluble concentrate, a suspension concentrate, a water-dispersible granule, or a dispersible oil suspension;

[0022] The present invention also discloses the application of the herbicidal composition described above in the control of weeds in cornfields.

[0023] Furthermore, the cornfield weeds mentioned are annual or perennial weeds;

[0024] Furthermore, the weeds mentioned are Echinochloa crus-galli, Setaria viridis, Convolvulus arvense, Portulaca oleracea, Cyperus rotundus, and Cyperus difformis.

[0025] Furthermore, the herbicidal composition is applied to unwanted plants or their growing areas.

[0026] The beneficial effects of this invention are as follows:

[0027] The herbicidal composition of the present invention is a ternary composition that significantly expands the spectrum of weed control through multiple mechanisms of action. The ternary compounding delays weed resistance through complementary mechanisms of action and can cover weeds that have developed resistance to traditional herbicides. Its control efficacy is significantly better than that of two-component combinations. It reduces the amount of pesticide used, lowers costs, and reduces environmental residues. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer and more concise, the invention is described using the following specific embodiments, but the invention is by no means limited to these embodiments. The embodiments described below are merely preferred embodiments of the invention and can be used to describe the invention, but should not be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the protection scope of this invention.

[0029] Preparation method of formulation example:

[0030] 1. Water-dispersible granules: According to the formula ratio, the active ingredients are added to the carrier, and surfactants and other functional additives are added to it. After mixing, the mixture is pulverized by air jet and 10-25% water is added. Then, the mixture is kneaded, granulated, dried and sieved to obtain the water-dispersible granule product; or the pulverized powder is sprayed with water, granulated and dried in a fluidized bed granulator, and then sieved to obtain the product.

[0031] 2. Wettable powder: According to the formula ratio, the active ingredients, dispersant, wetting agent and filler are mixed and stirred evenly in a mixing tank. The mixture is then pulverized and mixed evenly multiple times by an air jet mill to prepare the wettable powder of the composition of the present invention.

[0032] 3. Suspension agent: According to the formula ratio, the active ingredients, surfactants and other functional additives are placed in the reaction vessel in sequence, water is added and mixed evenly, and then subjected to high-speed shearing, wet sand milling and finally homogenization filtration to obtain the suspension agent product.

[0033] 4. Emulsifiable concentrate: According to the formula ratio, add the active ingredient, solvent, and co-solvent into the mixing tank and stir to dissolve them. Then add the emulsifier, and use the remaining solvent to make up the balance. Stir evenly in the mixing tank, and filter to obtain the emulsifiable concentrate required by the present invention.

[0034] 5. Microemulsion: According to the formula ratio, the active ingredients, solvents, emulsifiers, etc. are mixed evenly to obtain the oil phase. The antifreeze and water are mixed evenly to obtain the aqueous phase. The oil phase is added to the aqueous phase under stirring and stirred evenly. Shearing is continued for 10 minutes. Then, the defoamer is added and stirred evenly to obtain small droplets with oil phase particles of 0.01 to 0.1 micrometers, which is the microemulsion product.

[0035] 6. Water-in-water emulsion: According to the formula ratio, dissolve the active ingredients in the solvent and add the emulsifier to form a homogeneous oil phase. Mix deionized water and antifreeze together to form a homogeneous aqueous phase. Under high-speed shearing, add the oil phase to the aqueous phase. Finally, add the thickener, preservative and defoamer to form a well-dispersed water-in-water emulsion product.

[0036] 7. Dispersible oil suspension: According to the formula ratio, the active ingredients, surfactants and other functional additives are placed in the reaction vessel in sequence, mixed with oil until uniform, and then subjected to high-speed shearing, wet sand milling and finally homogenized filtration to obtain the dispersible oil suspension product.

[0037] Formulation preparation example:

[0038] Preparation Example 1: 30% Bensulfuron-methyl·Nicosulfuron·Benzoxam water-dispersible granules (1:1:1)

[0039] Formula composition: 10% benzosulfuron, 10% nicosulfuron, 10% benzosulfonate, 8% sodium lignosulfonate, 3% styrene-phenol polyoxyethylene ether sulfate, 2% sodium dodecyl sulfate, 5% silica, 20% starch, and kaolin to make up the balance.

[0040] Preparation Example 2: 20% Bensulfuron-methyl·Nicosulfuron·Benzoxam wettable powder (1:2:1)

[0041] Formula composition: 5% benzosulfuron, 10% nicosulfuron, 5% benzosulfuron, 2% fatty alcohol polyoxyethylene ether sulfate, 3% sodium lignosulfonate, 2% succinate sulfonate, 8% kaolin, 10% silica, and bentonite to make up the balance.

[0042] Preparation Example 3: 12% Bensulfuron-methyl·Nicosulfuron·Benzoxam suspension emulsion (1:0.5:0.5)

[0043] Formula composition: 6% benzosulfuron, 3% nicosulfuron, 3% benzosulfonate, 2% sodium dioctyl succinate sulfonate, 3% glycerol fatty acid ester polyoxyethylene ether phosphate, 1% castor oil polyoxyethylene ether, 0.25% xanthan gum, 1% magnesium aluminum silicate, 5% ethylene glycol, 0.1% sodium sorbate, 0.5% silicone oil, deionized water to make up the balance.

[0044] Preparation Example 4: 12.5% ​​Bensulfuron-methyl·Nicosulfuron·Benzoxam EC (1:1:0.5)

[0045] Formula composition: 5% benzosulfuron, 5% nicosulfuron, 2.5% benzosulfuron, 10% N-methylpyrrolidone, 7% phenylethylphenol polyoxyethylene polyoxypropylene ether, 2% calcium dodecylbenzenesulfonate, 8% DMF, and methyl oleate to make up the balance.

[0046] Preparation Example 5: 10% benzosulfuron-methyl·nicosulfuron·benzosulfuron microemulsion (1:0.5:1)

[0047] Formula composition: 4% benzosulfuron, 2% nicosulfuron, 4% benzosulfuron, 15% cyclohexanone, 8% triphenylethylphenol polyoxyethylene ether, 3% alkylphenol polyoxyethylene ether, 1% fatty alcohol polyoxyethylene ether sulfate, 0.1% silicone defoamer, deionized water to make up the balance;

[0048] Preparation Example 6: 8% Bensulfuron-methyl·Nicosulfuron·Benzoxam aqueous emulsion (1:1:0.25)

[0049] Formula composition: 4% benzosulfuron, 4% nicosulfuron, 1% benzosulfuron, 8% isotridecyl alcohol polyoxyethylene ether, 1% fatty alcohol polyoxyethylene ether sulfate, 12% cyclohexanone, 0.25% xanthan gum, 4% ethylene glycol, 0.1% benzisothiazolinone potassium, 0.5% silicone oil, deionized water to make up the balance.

[0050] Preparation Example 7: 15% Bensulfuron-methyl·Nicosulfuron·Benzoxam dispersible oil suspension (1:2:2)

[0051] Formula composition: 3% benzosulfuron, 6% nicosulfuron, 6% benzosulfonate, 3% succinate sulfonate, 12% phenylethyl phenol polyoxyethylene polyoxypropylene ether, 2% gerbert alcohol polyoxyethylene ether, 2% naphthalene sulfonate formaldehyde condensate, 1% silica, 2% organic bentonite, and soybean oil to make up the balance.

[0052] Preparation Example 8: 20% Bensulfuron-methyl·Nicosulfuron·Nicosulfuron-methyl water-dispersible granules (1:1:8)

[0053] Formula composition: 2% benzosulfuron, 2% nicosulfuron, 16% mesotrione, 10% sodium lignosulfonate, 3% succinate sulfonate, 2% sodium dodecyl sulfate, 5% silica, 18% starch, and kaolin to make up the balance.

[0054] Preparation Example 9: 36% Bensulfuron-methyl·Nicosulfuron·Nicosulfuron wettable powder (1:1:16)

[0055] Formula composition: 2% benzosulfuron, 2% nicosulfuron, 32% mesotrione, 2% sodium alkyl naphthalene sulfonate, 5% sodium lignin sulfonate, 3% naphthalene sulfonate formaldehyde condensate, 10% kaolin, 10% silica, and bentonite to make up the balance.

[0056] Preparation Example 10: 9.5% Bensulfuron-methyl·Nicosulfuron·Mesotrione suspension emulsion (1:0.5:8)

[0057] Formula composition: 1% benzosulfuron, 0.5% nicosulfuron, 8% mesotrione, 2% fatty alcohol polyoxyethylene ether sulfate, 3% fatty acid polyoxyethylene ester, 2% gerbert alcohol polyoxyethylene ether, 0.25% xanthan gum, 1% magnesium aluminum silicate, 4% glycerol, 0.25% potassium benzoate, 0.5% silicone oil, deionized water to make up the balance.

[0058] Preparation Example 11: 10.5% Bensulfuron-methyl·Nicosulfuron·Mesotrione EC (1:2:4)

[0059] Formula composition: 1.5% benzosulfuron, 3% nicosulfuron, 6% mesotrione, 10% N-methylpyrrolidone, 6% isotridecyl alcohol polyoxyethylene ether, 2% sodium dodecyl sulfate, 10% DMF, methyl oleate to make up the balance.

[0060] Preparation Example 12: 9% Bensulfuron-methyl·Nicosulfuron·Nicosulfuron microemulsion (1:4:4)

[0061] Formula composition: 1% benzosulfuron, 4% nicosulfuron, 4% mesotrione, 12% cyclohexanone, 10% alkyl aryl polyoxyethylene ether polyoxypropylene ether, 2% sorbitol polyoxyethylene ether, 1% sodium dioctyl succinate sulfonate, 0.1% silicone defoamer, deionized water to make up the balance;

[0062] Preparation Example 13: 11% Bensulfuron-methyl·Nicosulfuron·Mesotrione emulsion (1:2:8)

[0063] Formula composition: 1% benzosulfuron, 2% nicosulfuron, 8% mesotrione, 8% triphenylethylphenol polyoxyethylene ether, 1% fatty alcohol polyoxyethylene ether sulfate, 10% cyclohexanone, 0.25% xanthan gum, 5% ethylene glycol, 0.2% sodium benzoate, 0.5% silicone oil, deionized water to make up the balance.

[0064] Preparation Example 14: 12% Bensulfuron-methyl·Nicosulfuron·Nicosulfuron-methyl dispersible oil suspension (1:1:4)

[0065] Formula composition: 2% benzosulfuron, 2% nicosulfuron, 8% mesotrione, 2% naphthalene sulfonate formaldehyde condensate, 10% phenylethyl phenol polyoxyethylene polyoxypropylene ether, 2% isotridecyl alcohol polyoxyethylene ether, 2% fatty alcohol polyoxyethylene ether sulfate, 1% silica, 1% organic bentonite, and soybean oil to make up the balance.

[0066] Indoor bioactivity test

[0067] Test basis: The test was conducted in accordance with NY / T 1155.4-2006 "Guidelines for Indoor Bioassay Tests of Pesticides - Herbicides Part 4: Activity Assay Test - Foliar Spray Method";

[0068] Experimental targets: Echinochloa crus-galli, Setaria viridis, Convolvulus arvense, Portulaca oleracea, Cyperus rotundus, Cyperus difformis;

[0069] Instruments and equipment: light incubator, quantitative spray equipment, electronic balance, pots and pans, pipettes, etc.;

[0070] Test soil: The test used air-dried loam with organic matter content ≤3%, neutral pH, good aeration, and sieved.

[0071] Experimental materials: A measured amount of soil was filled to 4 / 5 of the pot, and then watered from the bottom of the pot until the soil was completely saturated. Pretreated weed seeds were evenly sown on the soil surface, covered with 0.5cm–2cm of soil depending on seed size. After sowing, the plants were transplanted to a greenhouse for conventional cultivation. Watering was continued from the bottom of the pots. After emergence, thinning was carried out to ensure uniform weed density (total density of 120 plants / m²). 2 Select test materials with suitable leaf age for spray treatment.

[0072] Pharmaceutical preparation: Dissolve the above raw materials in a suitable solvent, and then dilute with a 0.1% Tween 80 aqueous solution;

[0073] Chemical treatment: Foliar spraying was performed according to the experimental design, from low to high doses. Each treatment was replicated four times, with a control group (no chemical treatment) included. After treatment, the surface of the test materials was allowed to air dry naturally before being transferred to a greenhouse for routine cultivation.

[0074] Investigation: The growth status of the tested weeds was observed and recorded regularly after treatment. The above-ground weeds were harvested 14 days after treatment and their fresh weight was measured.

[0075] Calculation formula:

[0076]

[0077] Theoretical fresh weight efficacy E0 (%) = 100 - [(100 - fresh weight efficacy of herbicide A) × (100 - fresh weight efficacy of herbicide B) × (100 - fresh weight efficacy of herbicide C)] / 100 2

[0078] Evaluation criteria: If E-E0 < -10%, it indicates an antagonistic effect; if E-E0 is between ±10%, it indicates an additive effect; if E-E0 > 10%, it indicates a synergistic effect.

[0079] The results of the indoor bioactivity test are shown below:

[0080] Table 1 Results of indoor bioactivity tests of the combination of benzosulfuron + nicosulfuron + benzoxazine on *Euphorbia lathyris*.

[0081]

[0082]

[0083] Table 1 shows that the combination of bensulfuron-methyl, nicosulfuron, and benzoxazole exhibits good indoor activity against *Echinochloa crus-galli*. The mass ratios of bensulfuron-methyl, nicosulfuron, and benzoxazole were 3+3+3 (1:1:1), 3+3+6 (1:1:2), 3+3+12 (1:1:4), 3+6+3 (1:2:1), 3+6+6 (1:2:2), 3+6+12 (1:2:4), 3+12+3 (1:4:1), 3+12+6 (1:4:2), 3+12+12 (1:4:4), 6+3+3 (1:0.5:0.5), 6+3+6 (1:0.5:1), 6+3+12 (1:0.5:2), 6+6+3 (1:1:0.5), and 6+6+6 (1: The following formulas, 1:1), 6+6+12(1:1:2), 6+12+3(1:2:0.5), 6+12+6(1:2:1), 6+12+12(1:2:2), 12+3+6(1:0.25:0.5), 12+3+12(1:0.25:1), 12+6+3(1:0.5:0.25), 12+6+6(1:0.5:0.5), 12+6+12(1:0.5:1), 12+12+3(1:1:0.25), 12+12+6(1:1:0.5), and 12+12+12(1:1:1), exhibit a synergistic effect on Qianjinzi.

[0084] Table 2 Results of indoor bioactivity tests of the combination of bensulfuron-methyl, nicosulfuron, and benzoxazine on field bindweed.

[0085]

[0086]

[0087] Table 2 shows that the combination of bensulfuron-methyl, nicosulfuron, and benzoxazole exhibits good indoor activity against field bindweed. The mass ratios of bensulfuron-methyl, nicosulfuron, and benzoxazole were 3+3+3 (1:1:1), 3+3+6 (1:1:2), 3+3+12 (1:1:4), 3+6+3 (1:2:1), 3+6+6 (1:2:2), 3+6+12 (1:2:4), 3+12+3 (1:4:1), 3+12+6 (1:4:2), 3+12+12 (1:4:4), 6+3+3 (1:0.5:0.5), 6+3+6 (1:0.5:1), 6+3+12 (1:0.5:2), 6+6+3 (1:1:0.5), and 6+6+6 (1:1:1:2). :1), 6+6+12(1:1:2), 6+12+3(1:2:0.5), 6+12+6(1:2:1), 6+12+12(1:2:2), 12+3+3(1:0.25:0.25), 12+3+6(1:0.25:0.5), 12+6+3(1:0.5:0.25), 12+6+6(1:0.5:0.5), 12+6+12(1:0.5:1), 12+12+3(1:1:0.25), 12+12+6(1:1:0.5), 12+12+12(1:1:1) showed a synergistic effect on field bindweed.

[0088] Table 3 Results of indoor bioactivity tests of the combination of benzosulfuron + nicosulfuron + benzoxazine with Cyperus rotundus.

[0089]

[0090]

[0091] Table 3 shows that the combination of bensulfuron-methyl, nicosulfuron, and benzoxazole exhibits good indoor activity against Cyperus rotundus. The mass ratios of bensulfuron-methyl, nicosulfuron, and benzoxazole were 3+3+3 (1:1:1), 3+3+6 (1:1:2), 3+3+12 (1:1:4), 3+6+3 (1:2:1), 3+6+6 (1:2:2), 3+6+12 (1:2:4), 3+12+3 (1:4:1), 3+12+6 (1:4:2), 3+12+12 (1:4:4), 6+3+3 (1:0.5:0.5), 6+3+6 (1:0.5:1), 6+3+12 (1:0.5:2), 6+6+3 (1:1:0.5), and 6+6+6 (1: The following formulations showed a synergistic effect on Cyperus rotundus: 1:1), 6+6+12(1:1:2), 6+12+3(1:2:0.5), 6+12+6(1:2:1), 6+12+12(1:2:2), 12+3+3(1:0.25:0.25), 12+3+6(1:0.25:0.5), 12+3+12(1:0.25:1), 12+6+6(1:0.5:0.5), 12+6+12(1:0.5:1), 12+12+3(1:1:0.25), 12+12+6(1:1:0.5), and 12+12+12(1:1:1).

[0092] Table 4 Results of indoor bioactivity tests of the combination of benzosulfuron + nicosulfuron + mesotrione with foxtail grass

[0093]

[0094]

[0095] Table 4 shows that the combination of bensulfuron-methyl, nicosulfuron, and mesotrione exhibits good indoor activity against *Setaria viridis*. The mass ratios of bensulfuron-methyl, nicosulfuron, and mesotrione were 3+3+12 (1:1:4), 3+3+24 (1:1:8), 3+3+48 (1:1:16), 3+6+12 (1:2:4), 3+6+24 (1:2:8), 3+6+48 (1:2:16), 3+12+12 (1:4:4), 3+12+24 (1:4:8), 3+12+48 (1:4:16), 6+3+12 (1:0.5:2), 6+3+24 (1:0.5:4), 6+3+48 (1:0.5:8), 6+6+12 (1:1:2), 6+ The following formulations showed a synergistic effect on foxtail grass: 6+24(1:1:4), 6+6+48(1:1:8), 6+12+12(1:2:2), 6+12+24(1:2:4), 6+12+48(1:2:8), 12+3+12(1:0.25:1), 12+3+24(1:0.25:2), 12+3+48(1:0.25:4), 12+6+12(1:0.5:1), 12+6+24(1:0.5:2), 12+6+48(1:0.5:4), 12+12+24(1:1:2), and 12+12+48(1:1:4).

[0096] Table 5. Results of indoor bioactivity tests of the combination of benzosulfuron-methyl, nicosulfuron-methyl, and mesotrione on purslane.

[0097]

[0098]

[0099] Table 5 shows that the combination of bensulfuron-methyl, nicosulfuron, and mesotrione exhibits good indoor activity against purslane. The mass ratios of bensulfuron-methyl, nicosulfuron, and mesotrione were 3+3+12 (1:1:4), 3+3+24 (1:1:8), 3+3+48 (1:1:16), 3+6+12 (1:2:4), 3+6+24 (1:2:8), 3+6+48 (1:2:16), 3+12+12 (1:4:4), 3+12+24 (1:4:8), 3+12+48 (1:4:16), 6+3+12 (1:0.5:2), 6+3+24 (1:0.5:4), 6+3+48 (1:0.5:8), 6+6+12 (1:1:2), 6... The following formulas showed a synergistic effect on purslane: +6+24(1:1:4), 6+6+48(1:1:8), 6+12+12(1:2:2), 6+12+24(1:2:4), 6+12+48(1:2:8), 12+3+24(1:0.25:2), 12+3+48(1:0.25:4), 12+6+12(1:0.5:1), 12+6+24(1:0.5:2), 12+6+48(1:0.5:4), 12+12+12(1:1:1), 12+12+24(1:1:2), and 12+12+48(1:1:4).

[0100] Table 6 Results of indoor bioactivity tests of the combination of benzosulfuron + nicosulfuron + mesotrione with Cyperus difformis.

[0101]

[0102] Table 4 shows that the combination of bensulfuron-methyl, nicosulfuron, and mesotrione exhibits good indoor activity against Cyperus difformis. The mass ratios of bensulfuron-methyl, nicosulfuron, and mesotrione were 3+3+12 (1:1:4), 3+3+24 (1:1:8), 3+3+48 (1:1:16), 3+6+12 (1:2:4), 3+6+24 (1:2:8), 3+6+48 (1:2:16), 3+12+12 (1:4:4), 3+12+24 (1:4:8), 3+12+48 (1:4:16), 6+3+12 (1:0.5:2), 6+3+24 (1:0.5:4), 6+3+48 (1:0.5:8), 6+6+12 (1:1:2), 6+ The following formulations showed a synergistic effect on Cyperus difformis: 6+24(1:1:4), 6+6+48(1:1:8), 6+12+12(1:2:2), 6+12+24(1:2:4), 6+12+48(1:2:8), 12+3+12(1:0.25:1), 12+3+24(1:0.25:2), 12+3+48(1:0.25:4), 12+6+12(1:0.5:1), 12+6+24(1:0.5:2), 12+6+48(1:0.5:4), 12+12+24(1:1:2), and 12+12+48(1:1:4).

[0103] Example 2: Field efficacy trial

[0104] Experimental site: Qunyi Village, Wulijie Subdistrict, Jiangxia District, Wuhan City, Hubei Province. The soil texture is loam, and the soil type is brown soil. The experimental site is flat, with good irrigation and drainage facilities and good soil moisture.

[0105] Experimental crop: Maize (Xianyu 335).

[0106] Control targets: The main annual weeds in the field are foxtail grass, crabgrass, barnyard grass, purslane, and amaranth, while other weeds are few and unevenly distributed.

[0107] Experimental Methods: This experiment employed a completely randomized block design, with water as the control (CK). Nine treatments were set up, as detailed in the table below. Each treatment was replicated four times, with a plot area of ​​20 m². 2 Spray the stems and leaves of corn seedlings when they have 2 to 10 leaves, and weeds when they have 3 to 5 leaves.

[0108] Experimental Survey: Two weed control efficacy surveys were conducted at 15 days and 30 days after application. The first survey, conducted 15 days after application, assessed the control effect on the number of weed plants. The second survey, conducted 30 days after application, assessed the control effect on both the number of weed plants and their fresh weight. The absolute number method was used for the surveys. Four sampling points were selected diagonally within each treatment plot, with each sampling point having an area of ​​0.25 m².2 (0.5m × 0.5m) Record the number of each weed and weigh the weeds (roots removed). Visually inspect the corn for phytotoxicity four times between application and corn maturity: 7, 15, and 30 days after application, and before harvest. Record any occurrences of phytotoxicity. After the corn is fully mature, remove the edge rows from each treatment plot and select a 10m section from the center of each plot. 2 The cornfield was manually harvested, threshed, and the yield was measured to calculate the yield per hectare.

[0109] Calculation method for pharmaceutical dosage:

[0110]

[0111] Results of field efficacy trials:

[0112] Table 7. Effects of different treatments on weed control and yield in maize fields

[0113]

[0114]

[0115] Table 7 shows that 15 days after application, the ternary compound treatment group had good control efficacy against weeds in corn fields, with total weed control efficacy of 86.32% and 89.03% respectively. The control efficacy of single-agent herbicides (benzylsulfuron, nicosulfuron, and mesotrione) against total weeds was 70.02%, 67.82%, and 66.60%, respectively. At 15 days after application, the ternary compound formulation showed higher total weed control efficacy than the binary compound and single-agent treatments. The ternary compound formulation had a residual effect of over 30 days, effectively controlling weed damage in corn fields.

[0116] No significant effects were observed on leaf color, plant growth status, or tasseling within the tested dosage range during the experiment, indicating that the pesticides are safe for maize. All pesticide treatments resulted in significant yield increases for maize, with the ternary compound formulation showing the highest yield increase rate at 25.04% and 23.14%.

Claims

1. A herbicidal composition, characterized in that, The active ingredients of the herbicidal composition include active ingredient A, active ingredient B and active ingredient C, wherein active ingredient A is benzosulfuron, active ingredient B is nicosulfuron, and active ingredient C is either benzosulfuron or mesosulfuron. The mass ratio of active ingredient A, active ingredient B and active ingredient C is 1:(0.25-4):(0.25-16).

2. The herbicidal composition according to claim 1, characterized in that, The active ingredient C is benzoxazine, and the mass ratio of active ingredient A, active ingredient B and active ingredient C is 1:(0.25-4):(0.25-4). The active ingredient C is nicosulfuron, and the mass ratio of active ingredient A to active ingredient B to active ingredient C is 1:(0.5-4):(1-16).

3. The herbicidal composition according to claim 2, characterized in that, The active ingredient C is benzoxazine, and the mass ratio of active ingredient A, active ingredient B and active ingredient C is 1:(0.25-4):(0.5-4); preferably, the mass ratio of active ingredient A to active ingredient B to active ingredient C is 1:(1-4):(2-4); The active ingredient C is nicosulfuron, and the mass ratio of active ingredient A to active ingredient B to active ingredient C is 1:(1-4):(1-16); preferably, the mass ratio of active ingredient A to active ingredient B to active ingredient C is 1:(2-4):(2-16).

4. The herbicidal composition according to claim 1, characterized in that, The active ingredients A, B, and C in the herbicidal composition have a mass percentage content of 1-90%. Preferably, the active ingredients A, B, and C in the herbicidal composition have a mass percentage content of 2-85%.

5. The herbicidal composition according to claim 1, characterized in that, In addition to the active ingredient, the herbicidal composition also includes agriculturally acceptable auxiliary ingredients selected from one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoamers, solvents, preservatives, stabilizers, synergists, or carriers.

6. The herbicidal composition according to claim 1, characterized in that, The herbicidal composition is prepared into an agriculturally permissible formulation.

7. The herbicidal composition according to claim 1, characterized in that, The dosage forms are soluble concentrates, suspension concentrates, water-dispersible granules, and dispersible oil suspensions.

8. The application of the herbicidal composition according to claim 1 in controlling weeds in cornfields.

9. The application according to claim 8, characterized in that, The cornfield weeds mentioned are annual or perennial weeds; Preferably, the weeds are *Echinochloa crus-galli*, *Setaria viridis*, *Convolvulus arvense*, *Portulaca oleracea*, *Cyperus rotundus*, and *Cyperus difformis*.

10. The application according to claim 8, characterized in that, The herbicidal composition is applied to unwanted plants or their growing areas.

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