A herbicidal composition and use thereof

Abstract

The application belongs to the technical field of pesticide weeding, and discloses a weeding composition and application. The active ingredient of the weeding composition comprises active ingredient A and active ingredient B. The active ingredient A is icafolin, the active ingredient B is any one of pyrazosulfuron-ethyl or bensulfuron-methyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:8-30:1. The weeding composition disclosed by the application expands the herbicidal spectrum, has excellent control effect on common broadleaf weeds, gramineous weeds and sedge weeds in rice fields, and is safe to rice.

Description

A herbicide composition and its application Technical Field

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

[0002] Pyrimisulfuron, also known as weed killer, rice song, and rice moon herbicide, is a sulfonylurea herbicide. It is a selective systemic herbicide, mainly absorbed through the roots, and rapidly translocates within the weed plant, inhibiting its growth and causing it to gradually die. Pyrimisulfuron can control annual and perennial broadleaf weeds and sedges, such as Cyperus difformis, water sedge, fireweed, duckweed, water celery, jointed greens, arrowhead, pondweed, duckweed, and eclipta prostrata. However, it is less effective against barnyard grass and Echinochloa crus-galli, among other grasses.

[0003] Bensulfuron-methyl is a selective systemic herbicide for rice paddies. It is effective in controlling annual and perennial broadleaf weeds and sedges. It can be absorbed by the roots and leaves of weeds and transported to other parts of the plant. However, it is less effective against barnyard grass and other grassy weeds. This herbicide is not suitable for use in rice paddies where barnyard grass is the dominant herb.

[0004] Weeds are a major factor affecting rice yield and quality, long troubling farmers and hindering the development of high-efficiency, high-yield rice cultivation. Different rice cultivation methods and herbicide application techniques lead to variations in weed occurrence, damage, and the structure and population size of weed communities in paddy fields. To improve current problems such as poor herbicide efficacy, resistance, and phytotoxicity, it is essential to scientifically select herbicides with appropriate spectrum of action based on the types of weeds in paddy fields. The use of compound herbicides can effectively broaden the spectrum of action and reduce the amount of herbicide used. Therefore, the inventors of this application have compounded icafolin with pyrimisulfuron or bensulfuron-methyl, seeking suitable compounding ratios to provide a broad-spectrum, highly effective, low-toxicity, and long-lasting herbicide for the scientific and rational control of weeds in paddy fields. Summary of the Invention

[0005] Based on the above, the purpose of this invention is to provide a herbicidal composition in which the active ingredient comprises icafolin and any one of pyrimisulfuron or bensulfuron-methyl. This herbicidal composition broadens the spectrum of weed control and has excellent control effects on broadleaf weeds, grass weeds and sedge weeds in paddy fields. It is also safe for rice and suitable for the control of various common weeds in paddy fields.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a herbicidal composition, wherein the active ingredients of the herbicidal composition include active ingredient A and active ingredient B, wherein active ingredient A is icafolin, and active ingredient B is either pyrimisulfuron or bensulfuron-methyl, and the mass ratio of active ingredient A to active ingredient B is 1:8 to 30:1, or any value within the above range.

[0007] Furthermore, the active ingredient B is pyrimisulfuron, and the mass ratio of the active ingredient A to the active ingredient B is any value within the range of 1:6.4 to 20:1 or above.

[0008] Further, the mass ratio of active ingredient A to active ingredient B is 5:2 (2.5:1), 5:4 (1.25:1), 5:8 (1:1.64), 5:16 (1:3.2), 5:32 (1:6.4), 10:2 (5:1), 20:2 (10:1), and 40:2 (20:1);

[0009] Furthermore, the active ingredient B is pyrimisulfuron, and the mass ratio of the active ingredient A to the active ingredient B is any value within the range of 1:3.2 to 10:1 or higher.

[0010] Furthermore, the mass ratio of active ingredient A to active ingredient B is 5:2 (2.5:1), 5:4 (1.25:1), 5:8 (1:1.64), 5:16 (1:3.2), 10:2 (5:1), or 20:2 (10:1).

[0011] Furthermore, the active ingredient B is bensulfuron-methyl, and the mass ratio of active ingredient A to active ingredient B is 1:8 to 12:1, or any value within the above range.

[0012] Furthermore, the mass ratio of active ingredient A to active ingredient B is 5:5 (1:1), 5:10 (1:2), 5:20 (1:4), 5:30 (1:6), 5:40 (1:8), 10:5 (2:1), 20:5 (4:1), 40:5 (8:1), or 60:5 (12:1).

[0013] Furthermore, the active ingredient B is bensulfuron-methyl, and the mass ratio of active ingredient A to active ingredient B is 1:6 to 12:1, or any value within the above range.

[0014] Furthermore, the mass ratio of active ingredient A to active ingredient B is 5:5 (1:1), 5:10 (1:2), 5:20 (1:4), 5:30 (1:6), 10:5 (2:1), 20:5 (4:1), 40:5 (8:1), and 60:5 (12:1);

[0015] Furthermore, the total weight of the herbicidal composition is 100 wt%, and the total weight of active ingredient A and active ingredient B accounts for 0.01% to 80% of the herbicidal composition.

[0016] Furthermore, the herbicidal composition contains other auxiliary ingredients in addition to the active ingredients, and the auxiliary ingredients are selected from one or more of the following: wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoamers, solvents, preservatives, stabilizers, synergists or carriers.

[0017] Furthermore, the wetting agent is selected from one or more of alkylbenzene sulfonates, alkylnaphthalene sulfonates, lignin sulfonates, sodium dodecyl sulfate, sodium dioctyl succinate sulfonate, α-olefin sulfonates, alkylphenol polyoxyethylene ethers, castor oil polyoxyethylene ethers, alkylphenol ethoxylates, fatty alcohol ethoxylates, sodium fatty alcohol polyoxyethylene ether sulfate, silkworm excrement, soapberry powder, soapberry powder, SOPA, detergents, emulsifiers 2000 series, and wetting and penetrating agents F; and / or

[0018] The dispersant is selected from one or more of the following: lignin sulfonates, alkyl naphthalene sulfonates formaldehyde condensates, naphthalene sulfonates, tristyrylphenol ethoxylate phosphates, fatty alcohol ethoxylates, alkylphenol polyoxyethylene ethers, alkylphenol polyoxyethylene ether methyl ether condensates sulfates, fatty amine polyoxyethylene ethers, glycerol fatty acid ester polyoxyethylene ethers, polycarboxylates, polyacrylic acids, phosphates, EO-PO block copolymers, and EO-PO graft copolymers; and / or

[0019] The emulsifier is selected from one or more of the following: calcium dodecylbenzenesulfonate, alkylphenol formaldehyde resin polyoxyethylene ether, phenethylphenol polyoxyethylene polyoxypropylene ether, fatty alcohol ethylene oxide-propylene oxide copolymer, styrene-phenol polyoxyethylene ether, castor oil polyoxyethylene ether, and alkylphenol ether phosphate; and / or

[0020] The thickener is selected from one or more of xanthan gum, organobentonite, gum arabic, sodium alginate, magnesium aluminum silicate, carboxymethyl cellulose, and silica; and / or

[0021] The disintegrant is selected from one or more of sodium sulfate, ammonium sulfate, aluminum chloride, sodium chloride, ammonium chloride, bentonite, glucose, sucrose, starch, cellulose, urea, sodium carbonate, sodium bicarbonate, citric acid, and tartaric acid; and / or

[0022] Antifreeze is selected from one or more of alcohols, alcohol ethers, chlorinated hydrocarbons, and inorganic salts; and / or

[0023] Defoamer selected from C 10 -C 20 Saturated fatty acid compounds, silicone oil, silicone compounds, C8-C 10 One or more of the fatty alcohols; and / or

[0024] The solvent is selected from one or more of benzene, toluene, xylene, mesitylene, methanol, ethanol, isopropanol, n-butanol, dimethyl sulfoxide, dimethylformamide, cyclohexanone, hydrocarbon carbonates, diesel oil, solvent oil, vegetable oil, vegetable oil derivatives, and water; and / or

[0025] The preservative is selected from one or more of propionic acid, sodium propionate, sorbic acid, sodium sorbate, potassium sorbate, benzoic acid, sodium benzoate, sodium p-hydroxybenzoate, methyl p-hydroxybenzoate, Kathon, and 1,2-benzisothiazolin-3-one; and / or

[0026] The stabilizer is selected from one or more of the following: disodium hydrogen phosphate, oxalic acid, succinic acid, adipic acid, borax, 2,6-di-tert-butyl-p-cresol, triethanolamine oleate, epoxidized vegetable oil, kaolin, bentonite, attapulgite, silica, talc, montmorillonite, and starch; and / or

[0027] Synergists are selected from synergistic phosphorus, synergistic ether; and / or

[0028] The carrier is selected from one or more of the following: ammonium salts, ground natural minerals, ground artificial minerals, silicates, resins, waxes, solid fertilizers, water, organic solvents, mineral oils, vegetable oils, and vegetable oil derivatives.

[0029] Furthermore, the formulation of the herbicidal composition is prepared in the form of a solid dosage form and / or a liquid dosage form;

[0030] Furthermore, the solid dosage forms include powders, granules, balls, tablets, strips, wettable powders, oil-dispersible powders, emulsion powders, water-dispersible granules, emulsion granules, water-dispersible tablets, soluble powders, soluble tablets, or soluble granules;

[0031] The liquid formulations include soluble agents, colloids, oils, spreading oils, emulsions, latexes, dispersible liquids, ointments, water emulsions, oil emulsions, microemulsions, lipid suspensions, microcapsule suspensions, oil suspensions, dispersible oil suspensions, suspensions, microcapsule suspension-suspension agents, microcapsule suspension-water emulsions, or microcapsule suspension-suspension emulsions.

[0032] Furthermore, the solid formulation is a water-dispersible granule or a wettable powder, and the liquid formulation is a dispersible oil suspension.

[0033] The present invention also discloses the application of the herbicidal composition described above for controlling unwanted plants.

[0034] Furthermore, the unwanted plants are broadleaf weeds, grass weeds, and / or sedge weeds.

[0035] Furthermore, the unwanted plant growth site is a rice paddy.

[0036] To achieve the desired weed control effect, the dosage of this composition varies depending on various factors, such as the crop to be protected, the type of pest, the degree of infection, climatic conditions, application location, application method, and formulation used.

[0037] The beneficial effects of this invention are as follows:

[0038] 1. The herbicidal composition provided by this invention can effectively control weeds in paddy fields and delay the development of herbicide resistance in weeds;

[0039] 2. The herbicidal composition of the present invention broadens the spectrum of weed control, exhibiting excellent activity against grassy weeds, sedges, and broadleaf weeds. Compared with single agents, it has a significant synergistic effect on the control of these weeds, and has a long residual effect, which can reduce the dosage of pesticides, reduce the cost of pesticides, and reduce the impact on the environment. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Formulation Preparation Example 1: 28% icafolin·pyrimisulfuron wettable powder (1:6)

[0042] Formula composition: 4% icafolin, 24% pyrimisulfonate, 4% sodium alkyl naphthalene sulfonate, 6% sodium lignosulfonate, 2% naphthalene sulfonate formaldehyde condensate, 2% sodium dodecyl sulfate, kaolin to make up the balance;

[0043] Preparation method: According to the formula ratio, the active ingredients, dispersant, wetting agent and filler are mixed and stirred evenly in a stirring 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.

[0044] Formulation Preparation Example 2: 21% icafolin·pyrimisulfuron water-dispersible granules (20:1)

[0045] Formula composition: 20% icafolin, 1% pyrimisulfuron, 3% sodium dodecylbenzenesulfonate, 8% naphthalenesulfonate formaldehyde condensate, 8% sodium lignin sulfonate, 5% white sugar, 4% stretching powder BX, and kaolin to make up the balance.

[0046] Preparation method: 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 pulverization, 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 the product.

[0047] Formulation Preparation Example 3: 14% icafolin·pyrimisulfuron dispersible oil suspension (2.5:1)

[0048] Formula composition: 10% icafolin, 4% pyrimisulfuron, 5% isotridecyl alcohol polyoxyethylene ether, 8% glycerol fatty acid ester polyoxyethylene ether, 1% calcium dodecylbenzenesulfonate, 1% sodium polycarboxylate, 1% formaldehyde condensate of sodium methylnaphthalenesulfonate, 1% organic bentonite, soybean oil to make up the balance.

[0049] Preparation method: 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.

[0050] Formulation Preparation Example 4: 14% icafolin·benzylsulfuron wettable powder (1:6)

[0051] Formula composition: 2% icafolin, 12% bensulfuron-methyl, 7% tea saponin, 3% BX (a type of chemical compound), 2% fatty alcohol polyoxyethylene ether, 3% sodium polycarboxylate, 5% silica, and kaolin to make up the balance.

[0052] Preparation method: Same as in Preparation Example 1.

[0053] Formulation Preparation Example 5: 26icafolin·benzylsulfuron-methyl water-dispersible granules (12:1)

[0054] Formula composition: 24% icafolin, 2% benzylsulfonate, 8% lignin sulfonate, 2% sodium dodecyl sulfate, 5% silica, 6% formaldehyde condensate of sodium methylnaphthalene sulfonate, 30% starch, and kaolin to make up the balance.

[0055] Preparation method: Same as in Preparation Example 2.

[0056] Formulation Preparation Example 6: 30% icafolin·benzylsulfuron-methyl dispersible oil suspension (1:1)

[0057] Formula composition: 15% icafolin, 15% benzylsulfamethoxam, 8% glycerol fatty acid ester polyoxyethylene ether, 2% castor oil polyoxyethylene ether, 3% calcium dodecylbenzenesulfonate, 2% naphthalenesulfonate formaldehyde condensate, 1% silica, methyl oleate to make up the balance;

[0058] Preparation method: Same as in preparation example 3.

[0059] Test Example 1: Indoor Bioactivity Assay

[0060] Test basis: The test refers to NY / T-1155.5-2006 "Guidelines for Indoor Bioassay Tests of Pesticides - Herbicides Part 5: Soil Activity Tests of Herbicides in Paddy Fields".

[0061] Experimental targets: barnyard grass, Echinochloa crus-galli, Sagittaria sagittifolia, Eclipta prostrata, Cyperus rotundus, Cyperus heterotropoides.

[0062] Experimental materials: Air-dried soil with an organic matter content ≤2%, neutral pH, and sieved was filled to 3 / 4 of the pot, and then watered from the top of the pot until the soil was completely saturated. The test weed seeds were evenly and quantitatively sown on the soil surface, and covered with soil at a depth of 0.5cm to 2cm depending on the size of the seeds. The seeds were ready for use 24 hours after sowing.

[0063] Test reagents: Icapolin technical grade, pyrimisulfuron technical grade, and bensulfuron technical grade.

[0064] Preparation of the drug: Dissolve the above raw materials in a suitable solvent, and then dilute with a 0.1% Tween 80 aqueous solution.

[0065] Chemical treatment: Before treatment, the sample was irrigated to maintain a water layer of 1-2 cm. Using a pipette, a measured amount of the chemical was applied to the sample according to the experimental design, from low to high doses. Each treatment was replicated four times, with a control group containing no chemical. After treatment, the sample was transferred to a greenhouse for cultivation, maintaining a water layer of 1-2 cm throughout the experiment.

[0066] Investigation: Herbicidal activity was investigated and recorded using the absolute value method 14 days after treatment.

[0067] Calculation method:

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

[0069] The combined effects of the mixtures were determined using the Gowing method, and the calculation formula is as follows:

[0070] 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

[0071] Evaluation criteria for the combined effects of mixed drugs:

[0072] E-E0 > 10% indicates a synergistic effect, E-E0 < -10% indicates an antagonistic effect, and E-E0 between ±10% indicates an additive effect.

[0073] Experimental results:

[0074] Table 1. Combined indoor effects of icafolin and pyrimisulfuron on barnyardgrass.

[0075]

[0076]

[0077] Table 2. Combined indoor effects of icafolin and pyrimisulfuron on *Euphorbia lathyris*.

[0078]

[0079] Table 3. Combined indoor effects of icafolin and pyrimisulfuron on dwarf arrowhead.

[0080]

[0081]

[0082] Table 4. Combined indoor effects of icafolin and pyrimisulfuron on Cyperus difformis.

[0083]

[0084] As shown in Tables 1-4, the results of the combined indoor treatment show that pyrimisulfuron has poor control efficacy against barnyard grass and Echinochloa crus-galli, while the combination of icafolin and pyrimisulfuron has a synergistic effect on barnyard grass and Echinochloa crus-galli. When the mass ratio of icafolin to pyrimisulfuron is 5:32 to 40:2 (i.e., 1:6.4 to 20:1), it has a synergistic effect on common rice paddy weeds such as barnyard grass, Echinochloa crus-galli, Sagittaria sagittifolia, and Cyperus difformis.

[0085] Table 5 shows the combined indoor effects of icafolin and bensulfuron-methyl on barnyardgrass.

[0086]

[0087] Table 6 shows the combined effects of icafolin and bensulfuron-methyl on the interior of the guinea pig's intestine.

[0088]

[0089]

[0090] Table 7. Combined Indoor Effects of Icapolin and Bensulfuron-methyl on Sagittaria pyrifos

[0091]

[0092] Table 8. Combined effects of icafolin and bensulfuron-methyl on *Cyperus rotundus* in indoor settings.

[0093]

[0094]

[0095] As shown in Table 5-8, the combined effects of bensulfuron-methyl in the laboratory were poor against barnyardgrass and other grassy weeds. However, the combination of icafolin and bensulfuron-methyl showed a synergistic effect against barnyardgrass. When the mass ratio of icafolin to bensulfuron-methyl was 5:30 to 60:5 (i.e., 1:6 to 12:1), it showed a synergistic effect against common grassy weeds, broadleaf weeds, and sedges in paddy fields, such as barnyardgrass, sedge, arrowhead, and sedge.

[0096] Test Example 2: Field Efficacy Trial

[0097] Experimental location: The experiment was conducted in a paddy field in Tianfang Village, Shangji Town, Suiling County, Suihua City, Heilongjiang Province. The soil was sandy loam with medium to high fertility.

[0098] The experimental crop was rice (Longjing 46), which was sown on April 9, 2023, and transplanted on May 15.

[0099] Experimental plot arrangement: The experiment consisted of a total of 8 treatments, each repeated 4 times. The experimental plots were randomly arranged in blocks, with each plot having an area of ​​20m². 2 .

[0100] Application time and method: According to the experimental design, 5-10 days after rice transplanting and recovery, the pesticide was applied using the soil-mixing method, with 5 kg of pesticide mixed with soil for each treatment and evenly spread. A 3-5 cm water layer was maintained in the field under normal management, ensuring the water level did not submerge the rice seed heads. Water was maintained for 7 days after application. This was the only application during the rice's growth period; normal management followed thereafter.

[0101] Survey Content and Methods: The types and number of residual weeds in each treatment area were investigated 15 days and 30 days after application, and the control efficacy per plant was calculated. Following the plant control efficacy survey 30 days after application, the fresh weight of weeds on the ground in each treatment area was investigated, and the fresh weight control efficacy was calculated. The survey method involved randomly selecting 4 points per plot, each 0.25m wide. 2 Investigate the number of major weeds / fresh weight of aboveground parts at each point, and calculate the weed control efficacy / fresh weight control efficacy.

[0102] After applying the pesticide, investigate whether the rice is damaged. If it is damaged, accurately describe the symptoms of pesticide damage (growth inhibition, chlorosis, necrotic spots, deformity, etc.), and record in detail the symptoms, the time it takes for the rice to recover to normal growth, and the impact on rice tillering and plant height.

[0103] Before rice harvest, observe whether the ripening of the pesticide-treated areas is delayed. At harvest, measure the yield of each treated area and calculate the yield increase rate.

[0104] The calculation formula is as follows:

[0105]

[0106]

[0107]

[0108] Experimental Results and Analysis:

[0109] Table 9. Results of weed control efficacy trials in paddy fields 15 days after pesticide application.

[0110]

[0111] Table 10. Results of field weed control efficacy trials in rice paddies 30 days after application.

[0112]

[0113] Table 11 Field efficacy of herbicides in controlling weeds and yielding rice paddies

[0114]

[0115]

[0116] Safety results: During the periodic observation after pesticide application, the rice in each pesticide-treated plot showed no change compared to the water control plot, indicating that the tested pesticides were safe for rice at the tested dosages.

[0117] Control efficacy results: A survey of plant control efficacy 15 days after application showed that the effective ingredient dosages of 30% Icapolin·benzylsulfuron-methyl oil dispersible suspension (1:1), 21% Icapolin·benzylsulfuron-methyl water dispersible granules (20:1), 28% Icapolin·benzylsulfuron-methyl wettable powder (1:6), and 18% Icapolin·benzylsulfuron-methyl wettable powder (1:6) were 40 g / ha, 30 g / ha, 30 g / ha, and 40 g / ha, respectively. The plant control efficacy against gramineous weeds ranged from 84.86% to 87.67%, against broadleaf weeds from 90.79% to 94.39%, against sedges from 88.47% to 96.35%, and against total weeds from 88.18% to 91.28%. The control efficacy of the control agents 10% pyrimisulfuron wettable powder and 30% bensulfuron wettable powder against grassy weeds was poor. The control efficacy of 10% pyrimisulfuron wettable powder against grassy weeds, broadleaf weeds and sedges was 23.18%, 81.92% and 78.39%, respectively; the control efficacy of 30% bensulfuron wettable powder against grassy weeds, broadleaf weeds and sedges was 32.73%, 78.69% and 75.52%, respectively (see Table 9).

[0118] A survey of plant control efficacy was conducted 30 days after application. The effective ingredient dosages of 30% Icapolin·pyrimisulfuron-methyl oil dispersible suspension (1:1), 21% Icapolin·pyrimisulfuron-methyl water dispersible granules (20:1), 28% Icapolin·pyrimisulfuron-methyl wettable powder (1:6), and 18% Icapolin·pyrimisulfuron-methyl wettable powder (1:6) were 40 g / ha, 30 g / ha, 30 g / ha, and 40 g / ha, respectively. The plant control efficacy against gramineous weeds ranged from 87.29% to 92.42%, against broadleaf weeds from 92.69% to 96.27%, against sedges from 91.83% to 97.21%, and against total weeds from 90.36% to 94.30%. The control efficacy of the control agents 10% pyrimisulfuron wettable powder and 30% bensulfuron wettable powder against grassy weeds was poor. The control efficacy of 10% pyrimisulfuron wettable powder against grassy weeds, broadleaf weeds and sedges was 26.42%, 83.31% and 82.05%, respectively; the control efficacy of 30% bensulfuron wettable powder against grassy weeds, broadleaf weeds and sedges was 35.37%, 80.90% and 81.95%, respectively (see Table 10).

[0119] Yield Increase Results: Yields were measured in each treatment area before rice harvest. The effective ingredient dosages of the experimental agents 30% Icapolin·benzylsulfuron-methyl oil dispersible suspension (1:1), 21% Icapolin·benzylsulfuron-methyl water dispersible granules (20:1), 28% Icapolin·benzylsulfuron-methyl wettable powder (1:6), and 18% Icapolin·benzylsulfuron-methyl wettable powder (1:6) were 40 g / ha, 30 g / ha, 30 g / ha, and 40 g / ha, respectively. The rice maturity dates in all treatment areas were normal and consistent, and yields were significantly increased, with increase rates of 59.61%, 56.37%, 57.22%, and 55.71%, respectively.

[0120] Although the present invention has been described in detail above with general description and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention are within the scope of protection claimed by the present invention.

Claims

1. A herbicidal composition, characterized in that, The herbicidal composition comprises active ingredient A and active ingredient B. Active ingredient A is icafolin, and active ingredient B is either pyrimisulfuron or bensulfuron-methyl. When active ingredient B is pyrimisulfuron, the mass ratio of active ingredient A to active ingredient B is 1:6.4 to 20:

1. When active ingredient B is bensulfuron-methyl, the mass ratio of active ingredient A to active ingredient B is 1:8 to 12:

1.

2. The herbicidal composition according to claim 1, characterized in that, The active ingredient B is pyrimisulfuron, and the mass ratio of active ingredient A to active ingredient B is 1:3.2 to 10:

1.

3. The herbicidal composition according to claim 1, characterized in that, The active ingredient B is bensulfuron-methyl, and the mass ratio of active ingredient A to active ingredient B is 1:6 to 12:

1.

4. The herbicidal composition according to claim 1, characterized in that, The active ingredient B is pyrimisulfuron, and the mass ratio of active ingredient A to active ingredient B is 5:2, 5:4, 5:8, 5:16, 5:32, 10:2, 20:2, or 40:2; the active ingredient B is bensulfuron, and the mass ratio of active ingredient A to active ingredient B is 5:5, 5:10, 5:20, 5:30, 5:40, 10:5, 20:5, 40:5, or 60:

5.

5. The herbicidal composition according to claim 1, characterized in that, The total weight of the herbicidal composition is 100 wt%, and the total weight of active ingredient A and active ingredient B accounts for 0.01% to 80% of the herbicidal composition.

6. The herbicidal composition according to claim 1, characterized in that, In addition to the active ingredient, the herbicidal composition also contains other auxiliary ingredients, which are selected from one or more of the following: wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoamers, solvents, preservatives, stabilizers, synergists, or carriers.

7. The herbicidal composition according to claim 1, characterized in that, The formulations prepared from the herbicidal composition are in the form of solid and / or liquid formulations.

8. The herbicidal composition according to claim 7, characterized in that, The solid formulation is a water-dispersible granule or a wettable powder, and the liquid formulation is a dispersible oil suspension.

9. The herbicidal composition according to any one of claims 1-8 for the control of unwanted plants.

10. The application according to claim 9, characterized in that, The unwanted plants are broadleaf weeds, grass weeds and / or sedge weeds.

11. The application according to claim 9, characterized in that, The unwanted plant growth location is rice paddy.

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