Herbicide and use thereof

Abstract

The application belongs to the technical field of pesticide weeding, and discloses a kind of herbicide and its application, the herbicide contains active ingredient A and active ingredient B, the active ingredient A is isoxaflutole or its ester, the active ingredient B is any one of high-efficiency haloxyfop, quizalofop-p or acifluorfen-s, the mass ratio of the active ingredient A and the active ingredient B is 1:15-24:1.The herbicide can effectively prevent and treat various crop field weeds, can effectively enhance the prevention and treatment effect of single agent, has no adverse effect on crop growth, and has good safety.

Description

Technical Field

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

[0002] As an integral part of the agricultural ecosystem, weeds grow rapidly in farmland, competing with crops for water and nutrients. They also serve as intermediate hosts for various pests and diseases. If not controlled in time, they can spread and negatively impact crop growth. According to recent surveys conducted by the Plant Protection Station of the Ministry of Agriculture of China, there are approximately 580 species of common weeds in my country's farmland, belonging to 77 families. Among them, 427 species are found in dryland fields, accounting for 74%. This wide variety of species presents numerous challenges to weed control efforts.

[0003] Weeds are a major enemy of crop growth. They not only compete for water and sunlight, but more importantly, for nutrients and fertilizers. Furthermore, they act as vectors for pests and diseases, severely impacting crop growth and development. Chemical herbicides, on the other hand, are fast-acting, highly effective at killing weeds, and safe for crops.

[0004] The combined use of herbicides has the characteristics of broadening the spectrum of weed control, enhancing weed control activity, and slowing down the development of herbicide resistance in weeds. It is a common weed control method in agricultural production activities. Summary of the Invention

[0005] The purpose of this invention is to provide a herbicide with a reasonable composition, a significant synergistic effect, effective killing of various weeds, and safety for crops.

[0006] Another object of the present invention is to provide a herbicide formulation.

[0007] Another object of the present invention is to provide an application for controlling unwanted plants in crop fields.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a herbicide comprising active ingredient A and active ingredient B, wherein active ingredient A is isoxaflutole and its salt or ester, and active ingredient B is any one of haloxyfop-R-methyl, quizalofop-P-ethyl, or haloxyfop-R-methyl, and the mass ratio of active ingredient A to active ingredient B is 1:15 to 24:1.

[0009] Furthermore, the active ingredient A is isoxaflutole or isoxaflutole methyl ester;

[0010] Furthermore, the active ingredient B is highly effective flupyradifurone, and the mass ratio of active ingredient A to active ingredient B is 1:6 to 12:1;

[0011] The active ingredient B is quizalofop-P-ethyl, and the mass ratio of active ingredient A to active ingredient B is 1:4 to 12:1.

[0012] The active ingredient B is quizalofop-P-ethyl, and the mass ratio of active ingredient A to active ingredient B is 1:12 to 4:1.

[0013] Furthermore, the active ingredient B is highly effective flupyradifurone, and the mass ratio of active ingredient A to active ingredient B is 1:6 to 8:1;

[0014] The active ingredient B is quizalofop-P-ethyl, and the mass ratio of active ingredient A to active ingredient B is 1:4 to 8:1.

[0015] The active ingredient B is quizalofop-P-ethyl, and the mass ratio of active ingredient A to active ingredient B is 1:9 to 4:1.

[0016] Furthermore, the active ingredient accounts for 0.5% to 70% of the total weight of the herbicide, based on a total weight of 100 wt%.

[0017] Furthermore, the herbicide contains active ingredients and auxiliary ingredients, and is prepared into a formulation suitable for agricultural use.

[0018] Furthermore, the dosage form of the preparation is a solid dosage form or a liquid dosage form.

[0019] Furthermore, the solid formulation is a water-dispersible granule, and the liquid formulation is an emulsifiable concentrate, a dispersible oil suspension, a microemulsion, a suspension, or an emulsion.

[0020] The present invention also discloses the application of the herbicide described above for controlling unwanted plants in crop fields.

[0021] Furthermore, the crops mentioned are rapeseed, soybeans, cotton, peanuts, and cabbage.

[0022] Furthermore, the plant in question is a grassy weed, specifically wild oat, barnyard grass, foxtail grass, golden foxtail grass, crabgrass, wild millet, goosegrass, wild wheatgrass, thrush, goosegrass, bromegrass, barley, ryegrass, lycium, millet, annual bluegrass, double-spike barnyard grass, bermudagrass, cogongrass, creeping icegrass, reed, hard grass, and arm-shaped grass.

[0023] The beneficial effects of this invention are as follows:

[0024] The herbicide of this invention has a reasonable composition, a significant synergistic effect in weed control, and can delay the development and growth of resistance in target weeds. It has no adverse effects on crop growth and is safe. While reducing the dosage of pesticides, it also reduces production costs and alleviates the environmental pressure of pesticides. The herbicide of this invention has a good control effect on weeds in the fields of dryland crops such as rapeseed, soybeans, cotton, peanuts, and cabbage. Detailed Implementation

[0025] 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.

[0026] The preparation method for the formulation is as follows:

[0027] 1. Preparation method of water-dispersible granules: According to the formula ratio, add the active ingredients to the carrier, and add surfactants and other functional additives to it. Mix, and after air jet milling, add 10-25% water. Then knead, granulate, dry and sieve to obtain water-dispersible granules; or spray water, granulate and dry the pulverized powder in a fluidized bed granulator, and then sieve to obtain water-dispersible granules.

[0028] 2. Preparation method of wettable powder: According to the formula ratio, the active ingredients, dispersants, wetting agents and fillers 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 produce a wettable powder product.

[0029] 3. Preparation method of emulsifiable concentrate: According to the formula ratio, add the measured active ingredients, 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 make emulsifiable concentrate product.

[0030] 4. Preparation method of dispersible oil suspension: According to the formula ratio, the active ingredients, surfactants and other functional additives are placed in the reaction vessel in sequence, oil is added and mixed evenly, and then subjected to high-speed shearing, wet sand milling and finally homogenization filtration to obtain the dispersible oil suspension product.

[0031] 5. Microemulsion preparation method: According to the formula ratio, mix the active ingredients, solvent, emulsifier, etc. to obtain the oil phase. Mix the antifreeze and water evenly to obtain the aqueous phase. Add the oil phase to the aqueous phase under stirring and stir evenly. Continue shearing for 10 minutes. Then add the defoamer and stir evenly to obtain small droplets with oil phase particles of 0.01~0.1 micrometers, which is the microemulsion product.

[0032] 6. Preparation method of suspension: According to the formula ratio, place the active ingredients, surfactants and other functional additives in the reaction vessel in sequence, add water and mix evenly, then perform high-speed shearing, wet sand milling, and finally homogenization filtration to prepare the suspension product.

[0033] 7. Preparation method of water-emulsion: Dissolve the active ingredients in the solvent according to the formula ratio, add the emulsifier to dissolve into a uniform oil phase, mix deionized water, antifreeze, etc. together to form a uniform aqueous phase; under high-speed shearing, add the oil phase to the aqueous phase, shear until the particle size is qualified, add defoamer, thickener and preservative and stir evenly to form a well dispersed water-emulsion product.

[0034] The following is a formulation composition example for pharmaceutical preparation:

[0035] Preparation Example 1: 33% Isoxaflutamide·High-efficiency flupyridine dispersible oil suspension (2:1)

[0036] Formula composition: 22% isoxaflutole, 11% high-efficiency flupyradifurone, 2% lignin sulfonate, 3% styrene-based phenol polyoxyethylene ether, 15% castor oil polyoxyethylene ether, 2% calcium dodecylbenzene sulfonate, 1% silicon dioxide, and soybean oil to make up the balance.

[0037] Preparation Example 2: 20% isoxaflutamide·high-efficiency flupyradifurone microemulsion (4:1)

[0038] Formula composition: 16% isoxaflutole, 4% high-efficiency flupyradifurone, 20% cyclohexanone, 15% triphenylethylphenol polyoxyethylene ether, 5% alkyl glycoside, 5% isopropanol, 1% styrene-phenol polyoxyethylene ether sulfate, 0.1% silicone defoamer, deionized water to make up the balance.

[0039] Preparation Example 3: 15% isoxaflutamide methyl ester·high-efficiency flupyradifurone emulsifiable concentrate (1:1)

[0040] Formula composition: 7.5% isoxaflutamide methyl ester, 7.5% high-efficiency flupyridine haloxyfop-R-methyl, 18% DMF, 12% sorbitol polyoxyethylene ether, 2% calcium dodecylbenzene sulfonate, 18% propylene carbonate, and tricresyl to make up the balance.

[0041] Preparation Example 4: 9% isoxaflutole methyl ester·high-efficiency flupyradifurone water-in-oil emulsion (8:1)

[0042] Formula composition: 8% isoxaflutamide methyl ester, 1% high-efficiency flupyradifurone, 8% xylene, 12% cyclohexanone, 1% BHT, 2% castor oil polyoxyethylene ether phosphate, 3% ethylene oxide-propylene oxide copolymer, 4% ethylene glycol, 0.05% silicone defoamer, 0.1% xanthan gum, 0.1% potassium benzoate, deionized water to make up the balance.

[0043] Preparation Example 5: 30% isoxaflutole·quizalofop-P-ethyl suspension (4:1)

[0044] Formula composition: 24% isoxaflutole, 6% quizalofop-P-ethyl, 2% ethylene glycol oxyethylene polyoxypropylene ether, 2% glycerol fatty acid ester polyoxyethylene ether, 2% tristyrene phenol ethoxylate phosphate, 1% succinate sulfonate, 1% magnesium aluminum silicate, 0.1% carboxyethyl cellulose, 1% sodium sorbate, 5% glycerol, 0.5% silicone oil, deionized water to make up the balance.

[0045] Preparation Example 6: 24% isoxaflutole·quizalofop-P-ethyl water-dispersible granules (2:1)

[0046] Formula composition: 16% isoxaflutole, 8% quizalofop-P-ethyl, 10% sodium lignosulfonate, 2% BX (a type of acetic acid powder), 2% sodium alkyl polyoxyethylene ether sulfonate, and kaolin (make up the balance).

[0047] Preparation Example 7: 12% isoxaflutole methyl ester·quizalofop-P-ethyl microemulsion (1:2)

[0048] Formula composition: 4% isoxaflutole methyl ester, 8% quizalofop-P-ethyl, 12% thiamethoxam, 20% cyclohexanone, 10% sorbitol polyoxyethylene ether, 5% EO-PO block copolymer, 1% calcium dodecylbenzenesulfonate, 5% ethylene glycol, 0.05% silicone defoamer, 0.1% Kathon, deionized water to make up the balance.

[0049] Preparation Example 8: 18% isoxaflutole methyl ester·quizalofop-P-ethyl emulsifiable concentrate (1:1)

[0050] Formula composition: 9% isoxaflutole methyl ester, 9% quizalofop-P-ethyl, 17% N-methylpyrrolidone, 12% Gelbert alcohol polyoxyethylene ether, 2% calcium dodecylbenzene sulfonate, 12% DMF, and methyl oleate to make up the balance.

[0051] Preparation Example 9: 4% isoxaflutole·quizalofop-P-ethyl aqueous emulsion (1:3)

[0052] Formula composition: 1% isoxaflutole, 3% quizalofop-P-ethyl, 4% sorbitan oleate polyoxyethylene ether, 1% arylphenol polyoxyethylene ether phosphate, 12% cyclohexanone, 0.1% xanthan gum, 5% ethylene glycol, 1% urea, 0.3% sodium sorbate, 0.05% silicone defoamer, deionized water to make up the balance.

[0053] Preparation Example 10: 15% isoxaflutole·quizalofop-P-ethyl dispersible oil suspension (2:3)

[0054] Formula composition: 6% isoxaflutole, 9% quizalofop-P-ethyl, 2% sodium alkyl polyoxyethylene ether sulfonate, 15% castor oil polyoxyethylene ether, 2% fatty alcohol polyoxyethylene ether, 3% calcium dodecylbenzene sulfonate, 0.5% silica, 0.5% organic bentonite, and soybean oil to make up the balance.

[0055] Preparation Example 11: 11% isoxaflutole methyl ester·quizalofop-P-ethyl EC (8:3)

[0056] Formula composition: 8% isoxaflutamide methyl ester, 3% quizalofop-P-ethyl, 12% dimethyl sulfoxide, 10% isothiazine polyoxyethylene ether, 2% calcium dodecylbenzene sulfonate, 20% propylene carbonate, xylene to make up the balance.

[0057] Preparation Example 12: 7% isoxaflutamide methyl ester·quizalofop-P-ethyl microemulsion (4:3)

[0058] Formula composition: 4% isoxaflutole methyl ester, 3% quizalofop-P-ethyl, 20% cyclohexanone, 10% phenylethylphenol polyoxyethylene polyoxypropylene ether, 2% alkylphenol formaldehyde resin polyoxyethylene ether, 1% fatty alcohol polyoxyethylene ether sulfate, 5% tristyrene phenol polyoxyethylene ether, 0.02% silicone defoamer, deionized water to make up the balance.

[0059] Example 1: Determination of the combined effects of drug mixtures.

[0060] The test was conducted in accordance with the "Guidelines for Indoor Bioassay Tests of Pesticides" for the determination of the combined effects of mixed formulations (NY / T1155.7-2006).

[0061] The tested weeds were wild oats, barnyard grass, foxtail grass, wild millet, hard grass, and arm-shaped grass. A number of mature and plump seeds from the previous year were collected and prepared for use.

[0062] Culture conditions: The experiment was conducted in an artificial intelligence climate chamber. Several plastic pots with a diameter of 25 cm were selected, and an appropriate amount of moistened sterilized loam was added to make the soil surface diameter 20 cm. The temperature was 20-25℃, the relative humidity was 60%-80%, the light-dark cycle was 14h-10h, the light intensity was 2000 lx, and the culture medium was sieved, air-dried loam with an organic matter content of 1.6% and a pH of 6.7. The soil was thoroughly moistened by bottom irrigation in the pots. The pretreated test weed seeds were evenly sown on the soil surface, covered with 1 cm of soil, and then transferred to a greenhouse for conventional cultivation. The soil moisture was maintained by bottom irrigation in the pots.

[0063] Test agents: isoxaflutole, isoxaflutole methyl ester, haloxyfop-R-methyl, quizalofop-P-ethyl, or haloxyfop-R-methyl technical grade.

[0064] Pharmaceutical preparation: Dissolve the original drug in a suitable solvent, and then dilute it with a 0.1% Tween 80 aqueous solution.

[0065] Chemical treatment: After weed emergence, thinning was carried out to ensure uniform weed density. Suitable leaf age samples were selected for spraying. The spray volume was calibrated before the experiment, and spraying was performed in sequence from low to high doses according to the experimental design. Each treatment was replicated four times, with a blank control treatment using a 0.1% Tween 80 aqueous solution containing the appropriate organic solvent. After treatment, the surface of the samples was allowed to air dry naturally before being transferred to a greenhouse for routine cultivation.

[0066] Investigation: The growth status of the tested weeds was observed and recorded regularly after treatment. Twenty-one days after treatment, the above-ground weeds were harvested and their fresh weight was measured.

[0067] The theoretical fresh weight inhibition rate E0 of each drug after mixed treatment was calculated using the Gowing method.

[0068] Fresh weight control efficacy E = (Fresh weight of control area - Fresh weight of treatment area) × 100 / Fresh weight of control area

[0069] Theoretical control efficacy of the mixture E0 = Weed control efficacy of herbicide A at dosage P + Weed control efficacy of herbicide B at dosage Q - Weed control efficacy of herbicide A at dosage P × Weed control efficacy of herbicide B at dosage Q ÷ 100

[0070] Evaluation criteria for the combined effects of mixed drugs:

[0071] E-E0 > 10% indicates a synergistic effect, E-E0 < -10% indicates an antagonistic effect, and E-E0 between ±10% indicates an additive effect.

[0072] The results of the indoor combined effect test are shown in the table below:

[0073] Table 1. Results of in vitro bioactivity tests of isoxaflutole and flupyradifurone combined on wild millet.

[0074]

[0075] As shown in Table 1, different combinations of isoxaflutole and haloxyfop-R-methyl had (E-E0) values ​​higher than -10% for wild millet, indicating an additive or synergistic effect. Combinations of isoxaflutole and haloxyfop-R-methyl at mass ratios of 1:6 to 12:1, with E-E0 values ​​greater than 10%, all showed a synergistic effect on wild millet. Among these, the combination of isoxaflutole and haloxyfop-R-methyl at a mass ratio of 20:5 (4:1) had the most significant synergistic effect on the weed wild millet.

[0076] Table 2 Results of indoor bioactivity tests of isoxaflutole and quizalofop-P-ethyl in combination with hard grass

[0077]

[0078] As shown in Table 2, the (E-E0) values ​​of different combinations of isoxaflutole and quizalofop-P-ethyl against hard weeds were all higher than -10%, indicating an additive or synergistic effect. The mass ratios of isoxaflutole and quizalofop-P-ethyl were 1:6, 1:8 to 12:1, with E-E0 values ​​greater than 10%, all showing a synergistic effect against hard weeds. Among these, the synergistic effect of isoxaflutole and quizalofop-P-ethyl at a mass ratio of 20:10 (2:1) was the most significant against hard weeds.

[0079] Table 3. Results of indoor bioactivity tests of the combination of isoxaflutole and quizalofop-P-ethyl with Brachydendron.

[0080]

[0081] As shown in Table 3, different combinations of isoxaflutole and quizalofop-P-ethyl had (E-E0) values ​​higher than -10% against *Cladosporium arvense*, indicating an additive or synergistic effect. Combinations of isoxaflutole and quizalofop-P-ethyl at mass ratios of 1:12 to 4:1, with E-E0 values ​​greater than 10%, all showed a synergistic effect against *Cladosporium arvense*. Among these, the combination of isoxaflutole and quizalofop-P-ethyl at a mass ratio of 20:30 (2:3) showed the most significant synergistic effect against *Cladosporium arvense*.

[0082] Table 4. Results of indoor bioactivity tests of isoxaflutole methyl ester and flupyradifurone combined with wild oats.

[0083]

[0084] As shown in Table 4, different combinations of isoxaflutole and haloxyfop-R-methyl all exhibited (E-E0) values ​​higher than -10% for wild oats, indicating an additive or synergistic effect. Combinations of isoxaflutole and haloxyfop-R-methyl at mass ratios of 1:6 to 24:1, with E-E0 values ​​greater than 10%, all showed a synergistic effect on wild oats. Among these, the combination of isoxaflutole and haloxyfop-R-methyl at a mass ratio of 20:5 (4:1) showed the most significant synergistic effect on the weedy wild oats.

[0085] Table 5. Results of indoor bioactivity tests of isoxaflutole methyl ester and quizalofop-P-ethyl on foxtail grass.

[0086]

[0087] Table 5 shows that different combinations of isoxaflutole methyl ester and quizalofop-P-ethyl had (E-E0) values ​​higher than -10% for the effects on foxtail grass, indicating an additive or synergistic effect. Combinations of isoxaflutole methyl ester and quizalofop-P-ethyl at mass ratios of 1:6 and 1:4–8:1, with E-E0 values ​​greater than 10%, all showed a synergistic effect on foxtail grass. Among these, the combination of isoxaflutole methyl ester and quizalofop-P-ethyl at a mass ratio of 10:10 (1:1) had the most significant synergistic effect on the weed foxtail grass.

[0088] Table 6. Results of indoor bioactivity tests of isoxaflutole methyl ester and quizalofop-P-ethyl on barnyardgrass.

[0089]

[0090] As shown in Table 6, different combinations of isoxaflutole and quizalofop-P-ethyl had (E-E0) values ​​higher than -10% against barnyardgrass, indicating an additive or synergistic effect. Combinations of isoxaflutole and quizalofop-P-ethyl at mass ratios of 1:12 to 4:1 all showed E-E0 values ​​greater than 10%, demonstrating a synergistic effect against barnyardgrass. Among these, the combination of isoxaflutole and quizalofop-P-ethyl at a mass ratio of 40:30 (4:3) showed the most significant synergistic effect against barnyardgrass.

[0091] Example 2: Field efficacy test for controlling weeds in rapeseed fields.

[0092] Experimental site: The experiment was conducted in Puan Village, Jiangxia District, Wuhan City. The experimental site is flat, with convenient irrigation and drainage, and has clay soil with medium to high fertility.

[0093] Experimental crop: rapeseed (Zhongyou 12).

[0094] Experimental target: Gramineous weeds in rapeseed fields.

[0095] Experimental design: The experiment included 7 treatments and a blank control, with each treatment replicated 4 times, and each plot measuring 20 m². 2 Use a 3WJD-18 backpack electrostatic sprayer to evenly spray the weeds between the rows of rapeseed. The rapeseed should be at the 5-6 leaf stage and the weeds at the 3-7 leaf stage when applying the sprayer.

[0096] Efficacy survey: Field surveys were conducted 30 days and 60 days after application, with two survey points in each plot, each measuring 0.25m. 2 Record the number of weeds 30 and 60 days after application. 60 days after application, also measure the fresh weight efficacy (determine the fresh weight of the above-ground weeds) and calculate the herbicidal effect of the herbicide.

[0097] Formula for calculating drug efficacy:

[0098]

[0099]

[0100] Economic traits of rapeseed: Yield was measured when rapeseed was mature and harvested.

[0101] Table 7 Results of field herbicide efficacy test for controlling weeds in rapeseed fields

[0102]

[0103] Table 7 shows that 30 days after application, the preparation of Example 2: 20% isoxaflutole•high-efficiency flupyradifurone microemulsion (4:1) 30 g / hm 2 The highest control efficacy was observed, with a control efficacy of 87.52% per plant. The control efficacy against weeds 60 days after application was determined using Example 2: 20% isoxaflutole•high-efficiency flupyradifurone microemulsion (4:1) 30 g / hm². 2 The highest control efficacy was achieved with 95.37% control per plant and 96.10% control per fresh weight. The second highest efficacy was achieved with Preparation Example 5: 30% isoxaflutole•quizalofop-p-ethyl suspension (4:1) 40 g / hm². 2 The control efficacy was 92.07% per plant and 94.10% per fresh weight. In terms of rapeseed yield, the herbicide-treated plants showed higher yields than the control, increasing by 2.25%–16.61%. The highest yield was achieved with Preparation Example 2: 20% isoxaflutole•high-efficiency fluroxypyr microemulsion (4:1) 30 mL / ha, reaching 121.54 kg / 667m². 2 The yield increased by 16.61% compared to the control treatment, a significant increase. This demonstrates that the herbicide of this invention effectively suppresses weed growth in the field, promotes rapeseed growth and development, and results in higher yields.

[0104] Example 3: Field efficacy test for controlling weeds in soybean fields.

[0105] Experimental site: The experimental site is located in a soybean field in Taiping Village, Hulin City, Heilongjiang Province. The soil in the experimental site is black soil with medium to high soil fertility. The main grass weeds in the experimental field are barnyard grass, foxtail grass, and crabgrass.

[0106] Experimental Design: The experiment included seven pesticide treatments and a blank control. Field plots were arranged in a randomized block design, with each treatment replicated four times. Each plot was 28 m². 2 .

[0107] Application method: The experiment was conducted when soybeans were at the 2-3 compound leaf stage and annual weeds were at the 3-5 leaf stage. A 3WBS-16 intelligent electric sprayer from Taizhou, Zhejiang Province, was used to spray a fine mist onto the weeds. No other herbicides were used during the experiment.

[0108] Weed survey: 5 points were randomly selected from each plot 20 days after treatment, with each point measuring 0.25m. 2 The growth and plant-specific control efficacy of the tested herbicides were investigated. Weed fresh weight control efficacy was assessed 45 days after treatment. The combined method of plant-specific and fresh weight control efficacy was used to evaluate the control effect of the tested herbicides on annual weeds in soybean fields. Yield was measured at harvest.

[0109] Formula for calculating drug efficacy:

[0110]

[0111]

[0112] Table 8 Results of field herbicide efficacy test for soybean fields

[0113]

[0114] Through periodic observations after application, no phytotoxicity symptoms were observed in any treatment with the herbicide of this invention, indicating that the tested herbicide is safe for soybean growth at the experimental dosage. A survey conducted 20 days after application showed that the plant control efficacy against weeds of Preparation Example 3 (15% isoxaflutole methyl ester • quizalofop-P-ethyl EC (1:1), Preparation Example 12 (7% isoxaflutole methyl ester • quizalofop-P-ethyl microemulsion (4:3), and Preparation Example 7 (12% isoxaflutole methyl ester • quizalofop-P-ethyl microemulsion (1:2)) was 83.12%, 88.23%, and 85.89%, respectively. At 45 days post-application, Preparation Example 12 (7% isoxaflutole methyl ester • quizalofop-P-ethyl microemulsion (4:3)) showed the highest efficacy, with a plant control efficacy of 93.93% and a fresh weight control efficacy of 95.56%. Through field yield measurements, the yields of the following preparations were increased by 18.51%, 24.72%, and 20.69% respectively compared to the control: Example 3: 15% isoxaflutole methyl ester • high-efficiency flupyridine quizalofop-p-ethyl EC (1:1); Example 12: 7% isoxaflutole methyl ester • quizalofop-p-ethyl microemulsion (4:3); and Example 7: 12% isoxaflutole methyl ester • quizalofop-p-ethyl microemulsion (1:2).

[0115] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. Any changes or modifications made in accordance with the essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A herbicide, characterized in that, The herbicide contains active ingredient A and active ingredient B, wherein active ingredient A is isoxaflutole or isoxaflutole methyl ester, and active ingredient B is any one of haloxyfop-R-methyl, quizalofop-P-ethyl, or haloxyfop-R-methyl. The active ingredient B is highly effective flupyradifurone, and the mass ratio of active ingredient A to active ingredient B is 1:6~12:1; The active ingredient B is quizalofop-P-ethyl, and the mass ratio of active ingredient A to active ingredient B is 1:4 to 12:

1. The active ingredient B is quizalofop-P-ethyl, and the mass ratio of active ingredient A to active ingredient B is 1:12 to 4:

1.

2. The herbicide according to claim 1, characterized in that, The active ingredient B is highly efficient flupyradifurone, and the mass ratio of active ingredient A to active ingredient B is 1:6~8:1; The active ingredient B is quizalofop-P-ethyl, and the mass ratio of active ingredient A to active ingredient B is 1:4 to 8:

1. The active ingredient B is quizalofop-P-ethyl, and the mass ratio of active ingredient A to active ingredient B is 1:9 to 4:

1.

3. The herbicide according to claim 1, characterized in that, The total weight of the herbicide is 100 wt%, and the active ingredient accounts for 0.5% to 70% of the total weight of the herbicide.

4. The herbicide according to claim 1, characterized in that, The herbicide contains active ingredients and auxiliary ingredients, and is prepared into a formulation suitable for agricultural use.

5. The herbicide according to claim 4, characterized in that, The dosage form of the preparation is either a solid dosage form or a liquid dosage form.

6. The herbicide according to claim 5, characterized in that, The solid formulation is a water-dispersible granule, and the liquid formulation is an emulsifiable concentrate, a dispersible oil suspension, a microemulsion, a suspension, or an emulsion.

7. The application of the herbicide according to any one of claims 1-6 for controlling unwanted plants in crop fields, characterized in that, The crops mentioned are rapeseed and soybean; the plants mentioned are wild oats, barnyard grass, foxtail grass, wild millet, hard grass, and arm-shaped grass.

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