Weeding composition containing pyroxasulfone

Abstract

The invention belongs to the technical field of pesticide weeding, and discloses a weeding composition containing pyroxasulfone 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 pyroxasulfone, the active ingredient B is clomazone, the active ingredient C is pendimethalin, and the active ingredient B is dimethalin. The mass ratio of the active component A to the active component B to the active component C is (1-5): (5-50): (3-50). The weeding composition disclosed by the invention can be used for preventing and killing annual broadleaf weeds and grassy weeds in soybean fields, has a remarkable prevention and killing effect, and has the advantages of good quick-acting property, long lasting period, safety to crops and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticide weeding and discloses a herbicidal composition containing sulfonepyraclostrobin. Background Art

[0002] Pyroxasulfone, internationally known as pyroxasulfone, is a cell division inhibitor that inhibits the synthesis of very long-chain fatty acids (VLCFAs), thereby hindering the growth of meristems and coleoptiles. It is widely used in corn, wheat, soybeans, cotton, sunflowers, potatoes, peanuts and other crops to control annual grass weeds and broadleaf weeds.

[0003] Clomazone, also known internationally as clomazone, is a broad-spectrum, selective pre-emergence herbicide of the organic heterocyclic class. It is primarily used to control annual grasses and broadleaf weeds. It can be used as both a pre-emergence and post-emergence herbicide and is a photosynthesis inhibitor. It is suitable for controlling annual grasses and broadleaf weeds in crops such as rice, soybeans, peanuts, and corn.

[0004] Pendimethalin, also known internationally as pendimethalin, is a selective dinitroaniline herbicide widely used in cotton, corn, rice, potato, soybean, peanut, tobacco, and vegetable fields. It is a selective pre- and post-emergence dryland herbicide, absorbed by weeds through their shoots, stems, and roots.

[0005] Mixing or replacing pesticides is one of the most common methods for controlling weed resistance. Herbicide mixing or using mixed formulations is the most common method for controlling weeds in soybean fields. Whether mixing two or more herbicides produces synergistic or antagonistic effects has long been a focus of attention. Furthermore, the rational use of mixed herbicides or compound formulations can help prevent the rapid growth of certain weeds in the field, maintain the diversity and stability of field weed communities, slow the development of weed resistance, and ultimately facilitate sustainable and effective weed control.

[0006] Long-term use of a single type of herbicide in soybean fields can easily lead to a rapid replacement of the dominant species in the field weed community. Herbicides are one of the main factors that cause rapid changes in field weed species. When the agent is used, sensitive weeds are controlled while some less sensitive weed species (often minor weeds in the field at the time) can rapidly expand their populations under the screening effect of the agent, thereby becoming dominant species. In order to screen disposable herbicides for soybean fields and prevent the large-scale occurrence of certain weeds after the application of a single agent in the field, the inventors of this application compounded three herbicidal compounds, sulfamethoxazole, isothiocarb, and pendimethalin, screened the reasonable ratio of the compounded agent combination, and preliminarily established its application technology in soybean fields, providing a compounded herbicide with application prospects for soybean production. Summary of the Invention

[0007] Based on the above situation, the object of the present invention is to provide a herbicidal composition containing sulfonepyraclostrobin.

[0008] Another object of the present invention is to provide a sulfone-pyraclostrobin herbicide composition for use in controlling weeds in soybean fields. The herbicide composition expands the weed control spectrum, has excellent control effects on annual or perennial weeds, and is safe for crops.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a herbicidal composition containing sulfonepyraclostrobin, the herbicidal composition comprising active ingredient A, active ingredient B and active ingredient C, wherein the active ingredient A is sulfonepyraclostrobin, the active ingredient B is clomazone, and the active ingredient C is pendimethalin, and the mass ratio of the active ingredient A to the active ingredient B to the active ingredient C is (1-5): (5-50): (3-50), or any value within the above numerical range;

[0010] Furthermore, the mass ratio of active ingredient A to active ingredient B to active ingredient C in the herbicidal composition is (1-2): (5-40): (3-48), or any value within the above numerical range;

[0011] Furthermore, the mass ratio of active ingredient A to active ingredient B to active ingredient C in the herbicidal composition is (1-2):(5-20):(3-24), or any value within the above numerical range.

[0012] Furthermore, the mass ratio of active ingredient A to active ingredient B to active ingredient C in the herbicidal composition is 7.5+75+90 (1:10:12), 7.5+75+180 (1:10:24), 7.5+75+360 (1:10:48), 7.5+150+90 (1:20:12), 7.5+150+180 (1:20:24), 7 .5+150+360(1:20:48), 7.5+300+90(1:40:12), 7.5+300+180(1:40:24), 7.5+300+360(1:40:48), 15+75+90(1:5:6), 15+75+180(1:5:12), 15+75+360(1:5:24), 15+1 50+90(1:10:6), 15+150+180(1:10:12), 15+150+360(1:10:24), 15+300+90(1:20:6), 15+300+180(1:20:12), 15+300+360(1:20:24), 30+75+90(2:5:6), 30+75+180 (2:5:12), 30+75+360(2:5:24), 30+150+90(1:5:3), 30+150+180(1:5:6), 30+150+360(1:5:12), 30+300+90(1:10:3), 30+300+180(1:10:6), 30+300+360(1:10:12);

[0013] Furthermore, the mass ratio of active ingredient A to active ingredient B to active ingredient C in the herbicidal composition is 7.5+75+90 (1:10:12), 7.5+75+180 (1:10:24), 7.5+75+360 (1:10:48), 7.5+150+90 (1:20:12), 7.5+150+180 (1:20:24), 7.5+300+90 (1:40:12), 15+75+90 (1:5:6), 15+75+180 (1:5:12), 15+150+90 (1:10:6), 15+150+180 (1:10:24). +180(1:10:12), 15+300+90(1:20:6), 15+300+180(1:20:12), 30+75+90(2:5:6), 30+75+180(2:5:12), 30+75+360(2:5:24), 30+150+90(1:5:3), 30+150+180(1:5:6), 30+150+360(1:5:12), 30+300+90(1:10:3), 30+300+180(1:10:6), 30+300+360(1:10:12);

[0014] Furthermore, based on 100% of the total weight of the herbicidal composition, the active ingredient accounts for 2% to 80% of the total weight of the herbicidal composition.

[0015] Furthermore, the herbicidal composition includes, in addition to the active ingredient, agriculturally acceptable auxiliary ingredients, wherein the auxiliary ingredients are selected from one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoaming agents, solvents, preservatives, stabilizers, synergists or carriers.

[0016] Furthermore, the herbicidal composition can be prepared into an agriculturally acceptable formulation, which is a solid formulation or a liquid formulation.

[0017] Furthermore, the solid preparation is a water-dispersible granule or a wettable powder, and the liquid preparation is a suspension, an emulsifiable concentrate, a microemulsion, an emulsion in water, a dispersible oil suspension, or a microcapsule suspension.

[0018] The invention also discloses application of the above-mentioned herbicidal composition in controlling weeds in soybean fields.

[0019] Furthermore, the weeds are annual or perennial weeds, and the weeds are Amaranthus retroflexus, Xanthium sibiricum, Solanum nigrum, Crabgrass, and Setaria viridis.

[0020] Furthermore, the herbicidal composition is applied to the unwanted plants or their growth sites.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1) The herbicidal composition of the present invention rationally compounds herbicidal compositions with different mechanisms of action, and at an appropriate mass ratio, has a significant synergistic effect in controlling common weeds in soybean fields;

[0023] 2) The herbicidal composition of the present invention expands the weed control spectrum, reduces the amount of herbicide used, alleviates environmental pressure and effectively delays the development of weed resistance. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more concise and clear, the present invention is illustrated by the following specific embodiments, but the present invention is by no means limited to these embodiments. The embodiments described below are only preferred embodiments of the present invention and can be used to describe the present invention. They should not be understood as limiting the scope of the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0025] Preparation Example Preparation method:

[0026] 1. Water-dispersible granules: According to the formula ratio, the active ingredient is added to the carrier, and surfactants and other functional additives are added thereto, mixed, and after air flow grinding, 10-25% water is added, and then the mixture is kneaded, granulated, dried, and sieved to obtain the water-dispersible granule product; or the pulverized powder is sprayed with water in a boiling granulator, granulated, dried, and then sieved to obtain the product.

[0027] 2. Wettable powder: According to the formula ratio, the active ingredients, dispersants, wetting agents and fillers are mixed, uniformly stirred in a stirring tank, and pulverized and mixed uniformly multiple times in a jet mill to prepare the wettable powder of the composition of the present invention.

[0028] 3. Suspension concentrate: According to the formula ratio, the active ingredients, surfactants and other functional additives are placed in the reactor in sequence, water is added and mixed evenly, and the suspension concentrate product is obtained by high-speed shearing, wet sand grinding, and finally homogenization filtration.

[0029] 4. Emulsifiable concentrate: According to the formula ratio, the active ingredient, solvent, and cosolvent are added to a mixing kettle and stirred to dissolve them. Then, an emulsifier is added and the balance is supplemented with the remaining solvent. The mixture is stirred evenly in a stirred kettle and filtered to obtain the desired emulsifiable concentrate of the present invention.

[0030] 5. Microemulsion: According to the formula ratio, mix the active ingredients, solvents, emulsifiers, etc. to obtain the oil phase, mix the antifreeze and water to obtain the water phase, add the oil phase to the water phase while stirring, and continue shearing for 10 minutes. Then add the defoaming agent and stir evenly to obtain small droplets of oil phase particles of 0.01 to 0.1 microns, thus obtaining the microemulsion product.

[0031] 6. Emulsion in water: According to the formula ratio, dissolve the active ingredient in the solvent and add emulsifier to dissolve it into a uniform oil phase. Mix deionized water and antifreeze together to form a uniform water phase. Under high-speed shear, add the oil phase to the water phase. Finally, add thickener, preservative and defoaming agent to form a well-dispersed emulsion in water product.

[0032] 7. Dispersible oil suspension: According to the formula ratio, the active ingredients, surfactants and other functional additives are placed in the reactor in sequence, oil is added and mixed evenly, and the dispersible oil suspension product is obtained by high-speed shearing, wet sand grinding, and finally homogenization filtration.

[0033] Preparation example:

[0034] Preparation Example 1: 36% sulfone metabendazole, isothiocyanate, and pendimethalin water dispersible granules (1:5:3)

[0035] Formula composition: 4% sulfonepyraclostrobin, 20% isocyanate, 12% dimethoate, 12% sodium salt of polycarboxylate, 5% naphthalenesulfonate formaldehyde condensate, 2% sodium lauryl sulfate, 5% white carbon black, 25% starch, and kaolin makes up the balance.

[0036] Preparation Example 2: 24% sulfonepyraclostrobin·isothiazolin·pendimethalin wettable powder (1:5:6)

[0037] Formula composition: 2% sulfonepyraclostrobin, 10% isocyanate, 12% pendimethalin, 2% sodium lauryl sulfate, 4% sodium lignin sulfonate, 6% naphthalene sulfonate, 10% kaolin, 10% white carbon black, and bentonite makes up the balance.

[0038] Preparation Example 3: 18% sulfone metabendazole·isothiazolin·pendimethalin suspension (1:5:12)

[0039] Formula composition: 1% sulfonepyraclostrobin, 5% isothiocarb, 12% pendimethalin, 2% succinate sulfonate, 3% tristyrylphenol polyoxyethylene ether, 1% castor oil polyoxyethylene ether, 0.25% xanthan gum, 1% magnesium aluminum silicate, 4% ethylene glycol, 0.1% sodium sorbate, 0.5% silicone oil, and deionized water to make up the balance.

[0040] Preparation Example 4: 13% sulfone metabendazole·isothiazolin·pendimethalin emulsifiable concentrate (2:5:6)

[0041] Formula composition: 2% sulfonepyraclostrobin, 5% isothiocyanate, 6% pendimethalin, 16% N-methylpyrrolidone, 12% tristyrylphenol polyoxyethylene ether, 3% calcium dodecylbenzenesulfonate, 10% DMF, and methyl oleate makes up the balance.

[0042] Preparation Example 5: 19% sulfone metabendazole·isothiazolin·pendimethalin microemulsion (2:5:12)

[0043] Formula composition: 2% sulfonepyraclostrobin, 5% isothiazolinone, 12% pendimethalin, 20% cyclohexanone, 10% sorbitan oleate polyoxyethylene ether, 5% isotridecyl alcohol polyoxyethylene ether, 1% alkylphenol formaldehyde resin polyoxyethylene ether sulfate, 0.05% silicone defoamer, and deionized water to make up the balance;

[0044] Preparation Example 6: 6% sulfonepyraclostrobin·isothiazolin·pendimethalin aqueous emulsion (1:5:6)

[0045] Formula composition: 0.4% sulfonepyraclostrobin, 2.5% isothiocarb, 3% pendimethalin, 5% sorbitan oleate polyoxyethylene ether, 1% fatty alcohol polyoxyethylene ether sulfate, 18% cyclohexanone, 0.25% xanthan gum, 5% ethylene glycol, 0.1% sodium benzoate, 0.5% silicone oil, and deionized water to make up the balance.

[0046] Preparation Example 7: 34% sulfone metabendazole, isothiocyanate, and pendimethalin dispersible oil suspension (1:10:6)

[0047] Formula composition: 2% sulfonepyraclostrobin, 20% isocyanate, 12% dimethoate, 2% lignin sulfonate, 12% glycerol fatty acid ester polyoxyethylene ether, 5% castor oil polyoxyethylene ether, 2% naphthalene sulfonate formaldehyde condensate, 0.5% silicon dioxide, 0.5% organic bentonite, and soybean oil makes up the balance.

[0048] Example 1: Indoor biological activity test

[0049] Test basis: The test is based on NY / T 1155.3-2006 "Guidelines for Indoor Bioassay Tests of Pesticides - Herbicides Part 3: Activity Determination Test - Soil Spray Method";

[0050] Test targets: Amaranthus retroflexus, Xanthium sibiricum, Solanum nigrum, Crabgrass, Setaria viridis;

[0051] Instruments and equipment: light incubator, quantitative spray equipment, electronic balance, pots, pipettes, etc.;

[0052] Test soil: The test uses air-dried loam with an organic matter content of ≤3%, neutral pH, good air permeability, and sieved;

[0053] Test materials: Fill the test soil to 4 / 5 of the pot, and then use infiltration irrigation from the bottom of the pot to make the soil completely moist to saturation.

[0054] The pretreated weed seeds were evenly sown on the soil surface and covered with 0.5-2 cm of soil according to the size of the seeds. The soil was sprayed 24 hours after sowing and the seeds were transplanted into the greenhouse for conventional cultivation. Water was supplemented by bottom irrigation.

[0055] Preparation of the drug: Dissolve the above raw drugs in a suitable solvent, and then dilute with 0.1% Tween 80 aqueous solution;

[0056] Chemical treatment: Soil spray treatment was performed according to the experimental design, ranging from low to high doses. Each treatment was replicated four times, and a treatment without chemical was set as a blank control. After treatment, the chemical solution on the surface of the test material was allowed to air dry naturally, and then the material was moved to the greenhouse for conventional cultivation.

[0057] Experimental investigation: The weed control effect of each treatment was observed regularly after treatment. After 14 days, the absolute value survey method was used to investigate the fresh weight of surviving weeds and calculate the control effect.

[0058] Calculation formula:

[0059]

[0060] Theoretical fresh weight control effect E0 (%) = 100-[(100-fresh weight control effect of herbicide A) × (100-fresh weight control effect of herbicide B) × (100-fresh weight control effect of herbicide C)] / 100 2

[0061] Evaluation criteria: If E-E0 < -10%, it indicates antagonism; if E-E0 is between ±10%, it indicates additive effect; if E-E0 > 10%, it indicates synergism.

[0062] Test results:

[0063] Table 1 Results of indoor bioassay tests on the biological activity of different compound combinations against Amaranthus retroflexus

[0064]

[0065]

[0066] The results in Table 1 show that pyraclostrobin, clomazone, and pendimethalin have good indoor activity against Amaranthus retroflexus, a common weed in soybean fields. Among them, the mass ratios of sulfonepyraclostrobin, isocyanate and pendimethalin are 7.5+75+90 (1:10:12), 7.5+75+180 (1:10:24), 7.5+75+360 (1:10:48), 7.5+150+90 (1:20:12), 7.5+150+180 (1:20:24), 7.5+150+360 (1:20:48), 7.5+300+90 (1:40:12), 15+75+90 (1:5:6), 15+75+180 (1:5:12), 15+75+360 (1:5:24), 15+150+90 (1:10:6), and 15+150+180 (1:10:12). , 15+150+360(1:10:24), 15+300+90(1:20:6), 15+300+180(1:20:12), 15+300+360(1:20:24), 30+75+90(2:5:6), 30+75+180(2:5:12), 30+75+360(2:5:24), 30+150+90(1:5:3), 30+150+180(1:5:6), 30+150+360(1:5:12), 30+300+90(1:10:3), 30+300+180(1:10:6), and 30+300+360(1:10:12) showed synergistic effect on Amaranthus retroflexus.

[0067] Table 2 Results of indoor bioassay tests on the biological activity of different compound combinations against Setaria viridis

[0068]

[0069]

[0070] The results in Table 2 show that pyraclostrobin, clomazone, and pendimethalin have good indoor activity against Setaria viridis, a common weed in soybean fields. Among them, the mass ratios of sulfonepyraclostrobin, isocyanate and pendimethalin are 7.5+75+90 (1:10:12), 7.5+75+180 (1:10:24), 7.5+75+360 (1:10:48), 7.5+150+90 (1:20:12), 7.5+150+180 (1:20:24), 7.5+150+360 (1:20:48), 7.5+300+90 (1:40:12), 7.5+300+180 (1:40:24), 15+75+90 (1:5:6), 15+75+180 (1:5:12), 15+75+360 (1:5:24), and 15+150+90 (1:10:6). , 15+150+180(1:10:12), 15+150+360(1:10:24), 15+300+90(1:20:6), 15+300+180(1:20:12), 30+75+90(2:5:6), 30+75+180(2:5:12), 30+75+360(2:5:24), 30+150+90(1:5:3), 30+150+180(1:5:6), 30+150+360(1:5:12), 30+300+90(1:10:3), 30+300+180(1:10:6), and 30+300+360(1:10:12) showed a synergistic effect on Setaria viridis.

[0071] Table 3 Results of indoor bioassay tests on the biological activity of different compound combinations against Xanthium sibiricum

[0072]

[0073]

[0074] The results in Table 3 show that pyraclostrobin, clomazone, and pendimethalin have good indoor activity against Xanthium sibiricum, a common weed in soybean fields. Among them, the mass ratios of sulfonepyrazone, isocyanate and pendimethalin are 7.5+75+90(1:10:12), 7.5+75+180(1:10:24), 7.5+75+360(1:10:48), 7.5+150+90(1:20:12), 7.5+150+180(1:20:24), 7.5+150+360(1:20:48), 7.5+300+90(1:40:12), 7.5+300+180(1:40:24), 15+75+90(1:5:6), 15+75+180(1:5:12), 15+150+90(1:10:6), 15+150+180(1:10:1 2), 15+150+360(1:10:24), 15+300+90(1:20:6), 15+300+180(1:20:12), 15+300+360(1:20:24), 30+75+90(2:5:6), 30+75+180(2:5:12), 30+75+360(2:5:24), 30+150+90(1:5:3), 30+150+180(1:5:6), 30+150+360(1:5:12), 30+300+90(1:10:3), 30+300+180(1:10:6), and 30+300+360(1:10:12) showed a synergistic effect on Xanthium sibiricum.

[0075] Table 4 Results of indoor bioassay tests on the biological activity of different compound combinations against Digitaria tangutica

[0076]

[0077]

[0078] The results in Table 4 show that pyraclostrobin, clomazone, and pendimethalin have good indoor activity against Digitaria, a common weed in soybean fields. Among them, the mass ratios of sulfonepyraclostrobin, isocyanate and pendimethalin are 7.5+75+90 (1:10:12), 7.5+75+180 (1:10:24), 7.5+75+360 (1:10:48), 7.5+150+90 (1:20:12), 7.5+150+180 (1:20:24), 7.5+300+90 (1:40:12), 7.5+300+180 (1:40:24), 15+75+90 (1:5:6), 15+75+180 (1:5:12), 15+75+360 (1:5:24), 15+150+90 (1:10:6), and 15+150+180 (1:10:12). , 15+150+360(1:10:24), 15+300+90(1:20:6), 15+300+180(1:20:12), 15+300+360(1:20:24), 30+75+90(2:5:6), 30+75+180(2:5:12), 30+75+360(2:5:24), 30+150+90(1:5:3), 30+150+180(1:5:6), 30+150+360(1:5:12), 30+300+90(1:10:3), 30+300+180(1:10:6), 30+300+360(1:10:12) have a synergistic effect on crabgrass.

[0079] Table 5 Results of indoor bioassay tests on the biological activity of Solanum nigrum with different compound combinations

[0080]

[0081]

[0082] The results in Table 5 show that sulfamethoxazole, clomazone, and pendimethalin have good indoor activity against Solanum nigrum, a common weed in soybean fields. Among them, the mass ratios of sulfonepyrazone, isocyanate and pendimethalin are 7.5+75+90(1:10:12), 7.5+75+180(1:10:24), 7.5+75+360(1:10:48), 7.5+150+90(1:20:12), 7.5+150+180(1:20:24), 7.5+150+360(1:20:48), 7.5+300+90(1:40:12), 7.5+300+180(1:40:24), 15+75+90(1:5:6), 15+75+180(1:5:12), 15+75+360(1:5:24), 15+150+90(1:10:6 ), 15+150+180(1:10:12), 15+300+90(1:20:6), 15+300+180(1:20:12), 15+300+360(1:20:24), 30+75+90(2:5:6), 30+75+180(2:5:12), 30+75+360(2:5:24), 30+150+90(1:5:3), 30+150+180(1:5:6), 30+150+360(1:5:12), 30+300+90(1:10:3), 30+300+180(1:10:6), and 30+300+360(1:10:12) showed a synergistic effect on Solanum nigrum.

[0083] Example 2: Experimental study on the effect of various herbicides on weed control in soybean fields

[0084] Test basis: The field test was designed with reference to GB / T 17980.125-2004 “Guidelines for Field Efficacy Tests of Pesticides”.

[0085] Experimental location: The experimental site is located in the soybean field of Qicheng Town, Ningyang County, Tai'an City, Shandong Province. The field is relatively flat and the soil is loam.

[0086] The experimental crop was soybean (Zhonghuang 55). The main weeds in the experimental field were crabgrass, barnyard grass, Amaranthus retroflexus, and Purslane.

[0087] Experimental design: The experiment set up 10 treatments, including 8 pesticide treatments, manual weeding treatment and blank control. Each treatment was repeated 4 times, and the experimental plots were arranged in random blocks, with each plot area of ​​20m 2 On June 26, 2024, before soybean germination, the field soil was sprayed using a MATABI Super Green-16 backpack sprayer at a spray volume of 600 L / hm2. 2; Manual weeding was carried out in the manual weeding area on July 1, 11, 31 and September 11, 2024, respectively, and no weeding treatment was carried out in the blank control area.

[0088] Survey and statistics: 5 and 10 days after the application of the drug, the weed suppression was visually observed. 20 days after the application, the absolute number survey method was used to randomly select 5 sampling points in each plot of the drug-treated area and the blank control area, with a sampling area of ​​0.25 m per point. 2 The species and number of weeds surviving in the sample points were recorded. 40 days after the application, the species and number of weeds surviving in the sample points were recorded, and the fresh weight of the aboveground parts was measured. Based on the survey data, the plant efficacy and fresh weight efficacy of each treatment were calculated.

[0089] After soybeans matured, yield was measured. Three sampling points were randomly selected in each plot of each treatment, with a depth of 2 m 2 , collect all soybeans in the sampling point, air-dry them, thresh them and measure the yield.

[0090] Calculation method of drug efficacy:

[0091]

[0092]

[0093] The test results are shown in the table below:

[0094] Table 6 Control effects of different treatments on major weeds in soybean fields

[0095]

[0096] Table 6 shows that 20 days after application, the three-way combination treatments all showed good control efficacy against common weeds in soybean fields, with a total weed control efficacy of 90.86-92.76%. The control efficacy of the single-agent control agents, sulfamethoxazole, clomazone, and pendimethalin, was 75.91%, 70.85%, and 67.94%, respectively. When the combination was applied to the soil before soybean seedlings emerged, the total weed control efficacy 20 days after application was higher than that of the two-way combination and single-agent treatments.

[0097] At 40 days after application, the total weed control efficacy of the two-ingredient combination and single-agent treatments decreased compared to 20 days after application. In terms of fresh weight control efficacy, the three-ingredient combination treatments achieved efficacy of over 94% at all doses, significantly higher than the two-ingredient combination and single-agent treatments.

[0098] Table 7 Soybean yield in different weed control treatment areas

[0099] Serial number Chemical treatment <![CDATA[Yield in terms of conversion (kg / hm 2 )]]> Yield increase compared with blank control (%) 1 Preparation Example 1: 36% sulfone metabendazole, isothiocyanate, and pendimethalin water dispersible granules (1:5:3) 2193.28 89.16 2 Preparation Example 3: 18% sulfone metabendazole·isothiazolin·pendimethalin suspension (1:5:12) 2179.35 87.96 3 18% sulfone pyraclostrobin·isothiazolinone EC (1:5) 2048.09 76.64 4 24% sulfonepyraclostrobin·pendimethalin suspension concentrate (1:3) 1977.25 70.53 5 34% clomazone·pendimethalin water dispersible granules (5:12) 1908.56 64.61 6 40% sulfonepyraclostrobin suspension 1912.31 64.93 7 48% clomazone EC 1866.00 60.93 8 33% Pendimethalin EC 1840.06 58.70 9 Manual weeding 2131.40 83.82 10 Blank control 1159.48 /

[0100] Each pesticide treatment was safe for soybeans at the test dose, and no pesticide damage symptoms were found. The yield test results (Table 7) showed that the soybean yield in the area treated with the three-way compound pesticide was 2193.28 and 2179.35 kg / hm2.2 The soybean yields in all treatment areas were significantly higher than those in the blank control, with yield increases ranging from 58.70% to 89.16%. A single application of pesticides before soybean emergence had a significant weed control and yield-preserving effect, and it also saved manpower compared to manual weeding.

Claims

1. A herbicidal composition containing sulfonepyraclostrobin, characterized in that: The herbicidal composition comprises active ingredient A, active ingredient B and active ingredient C, wherein the active ingredient A is sulfonepyraclostrobin, the active ingredient B is isothiocarb, and the active ingredient C is pendimethalin. The mass ratio of the active ingredient A to the active ingredient B to the active ingredient C is (1-5): (5-50): (3-50).

2. The herbicidal composition according to claim 1, characterized in that The mass ratio of the active ingredient A to the active ingredient B to the active ingredient C in the herbicidal composition is (1-2): (5-40): (3-48).

3. The herbicidal composition according to claim 2, characterized in that The mass ratio of the active ingredient A to the active ingredient B to the active ingredient C in the herbicidal composition is (1-2): (5-20): (3-24).

4. The herbicidal composition according to claim 1, characterized in that The total weight of the herbicidal composition is 100%, and the active ingredient accounts for 1% to 80% of the total weight of the herbicidal composition.

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

6. The herbicidal composition according to claim 1, characterized in that The herbicidal composition can be prepared into an agriculturally acceptable formulation, which is a solid formulation or a liquid formulation.

7. The herbicidal composition according to claim 1, characterized in that The solid preparations are water-dispersible granules and wettable powders, and the liquid preparations are suspensions, emulsifiable concentrates, microemulsions, aqueous emulsions, dispersible oil suspensions, and microcapsule suspensions.

8. Use of the herbicidal composition according to any one of claims 1 to 7 for controlling weeds in soybean fields.

9. The use according to claim 8, characterized in that The weeds are annual or perennial weeds, and the weeds are Amaranthus retroflexus, Xanthium sibiricum, Solanum nigrum, Crabgrass and Setaria viridis.

10. The use according to claim 8, characterized in that The herbicidal composition is applied to the unwanted plants or the locus where they grow.

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