A herbicidal composition and use thereof

Abstract

The application discloses a kind of herbicidal composition and its application, the composition includes active ingredient A and active ingredient B, wherein active ingredient A is formula (I) compound, active ingredient B is selected from one or more of oxadiazon, propynyl oxadiazon, cyclopentane oxadiazon.The mass ratio of active ingredient A and active ingredient B of the composition is 1:60-20:1.The component of the application is reasonable, and the effect of weeding in rice field is good, and its activity and weeding effect are not the simple superposition of each component, compared with the existing single preparation, with the characteristics of weeding effect, low drug dosage, broad herbicidal spectrum, good crop safety.

Description

Technical Field

[0001] This invention belongs to the field of pesticide compound weed control technology, specifically relating to a weed control composition and its application in controlling annual or perennial weeds in rice fields. Background Technology

[0002] In recent years, rice cultivation methods have become increasingly diversified, leading to varying characteristics and degrees of weed occurrence in paddy fields. Weeds compete with rice for resources such as light, heat, and water, making them a major factor restricting high, stable, and high-quality rice yields. Chemical weed control is a method of controlling weeds based on the growth characteristics and patterns of crops and weeds, utilizing the types of chemical herbicides and their mechanisms of action on plants. The widespread use of herbicides has greatly reduced the workload of agricultural production, improved production efficiency, and reduced yield losses. However, the excessive application of herbicides in the field not only leads to increased herbicide resistance in weeds and phytotoxicity in crops, reducing economic yields, but also threatens environmental safety and human health.

[0003] Rational herbicide formulation is an effective method to improve control efficacy, broaden the weed control spectrum, delay weed resistance, reduce environmental pollution, lower usage costs, and reduce herbicide residues. The applicant unexpectedly discovered that mixing compound (I) with one or more of oxadiazon, propyzinoxadiazon, or cyclopentoxadiazon exhibits significant synergistic control effects against various annual or perennial weeds, while also reducing pesticide dosage, lowering control costs, and ensuring crop safety. Furthermore, a search revealed no reports of using compounds of formula (I) mixed with one or more of oxadiazon, propyzinoxadiazon, or cyclopentoxadiazon for the control of annual or perennial weeds. Summary of the Invention

[0004] The purpose of this invention is to provide a herbicidal composition that is rationally formulated, has low application cost, significant synergistic effect, good herbicidal effect, broad spectrum of herbicides, and is safe for crops.

[0005] Another object of the present invention is to provide a herbicidal composition formulation containing compound (I) and oxadiazon, propyne oxadiazon, and cyclopentoxadiazon.

[0006] Another object of the present invention is to provide the above-described herbicidal composition for the control of annual or perennial weeds in rice.

[0007] To solve the above problems, the present invention provides the following technical solution: a weeding composition comprising active ingredient A and active ingredient B, wherein active ingredient A is a compound of formula (I):

[0008] Active ingredient B is selected from one or more of oxadiazon, propyzinoxadiazon, and cyclopentoxadiazon ester;

[0009] Furthermore, the weight ratio of active ingredient A to active ingredient B in the herbicidal composition is 1:60 to 20:1;

[0010] Furthermore, the mass ratio of the compound of formula (I) to oxadiazon is 1:60 to 10:1;

[0011] Furthermore, the mass ratio of the compound of formula (I) to oxadiazon is 1:40 to 1:4;

[0012] Further, the mass ratio of the compound of formula (I) to oxadiazon is 2.5:50, 2.5:100, 2.5:150, 7.5:50, 7.5:100, 7.5:150, 12.5:50, 12.5:100, 12.5:150;

[0013] Further, the mass ratio of the compound of formula (I) to oxadiazon is 2.5:50, 2.5:100, 7.5:50, 7.5:100, 7.5:150, 12.5:50, 12.5:100, and 12.5:150;

[0014] Furthermore, the mass ratio of the compound of formula (I) to propyne oxadiazon is 1:30 to 6:1;

[0015] Furthermore, the mass ratio of the compound of formula (I) to propyne oxadiazon is 1:18 to 5:6;

[0016] Further, the mass ratio of the compound of formula (I) to propyzinoxadiazon is 2.5:15, 2.5:45, 2.5:75, 7.5:15, 7.5:45, 7.5:75, 12.5:15, 12.5:45, 12.5:75;

[0017] Further, the mass ratio of the compound of formula (I) to propyzinoxadiazon is 2.5:15, 2.5:45, 7.5:15, 7.5:45, 7.5:75, 12.5:15, 12.5:45, and 12.5:75;

[0018] Furthermore, the mass ratio of the compound of formula (I) to cyclopentoxane is 1:40 to 8:1;

[0019] Furthermore, the mass ratio of the compound of formula (I) to cyclopentoxane is 1:40 to 1:4;

[0020] Further, the mass ratio of the compound of formula (I) to cyclopentoxane is 2.5:50, 2.5:100, 2.5:150, 7.5:50, 7.5:100, 7.5:150, 12.5:50, 12.5:100, 12.5:150;

[0021] Further, the mass ratio of the compound of formula (I) to cyclopentoxane is 2.5:50, 2.5:100, 7.5:50, 7.5:100, 7.5:150, 12.5:50, 12.5:100, and 12.5:150;

[0022] Furthermore, the active ingredient A and active ingredient B together constitute 1% to 90% of the composition;

[0023] Furthermore, the active ingredient A and active ingredient B together constitute 5% to 85% of the composition;

[0024] The adjuvants used in the herbicidal composition of this invention include wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoamers, solvents, preservatives, stabilizers, synergists, carriers, and other known substances that are beneficial to the stability of the active ingredients in the formulation and to the exertion of their efficacy. These are all commonly used or permitted ingredients in pesticide formulations. The specific ingredients and dosages are determined through experiments according to the formulation requirements.

[0025] Furthermore, the herbicidal composition, in addition to the active ingredient, also includes agriculturally acceptable auxiliary ingredients, which are selected from one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoamers, solvents, preservatives, stabilizers, synergists, or carriers.

[0026] Further, 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

[0027] Further, the dispersant is selected from one or more of the following: lignin sulfonate, alkyl naphthalene sulfonate formaldehyde condensate, naphthalene sulfonate, tristyrylphenol ethoxylate phosphate, fatty alcohol ethoxylate, alkylphenol polyoxyethylene ether, alkylphenol polyoxyethylene ether methyl ether condensate sulfate, fatty amine polyoxyethylene ether, glycerol fatty acid ester polyoxyethylene ether, polycarboxylates, polyacrylic acids, phosphates, EO-PO block copolymers, and EO-PO graft copolymers; and / or

[0028] Further, 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

[0029] Furthermore, 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

[0030] Further, 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

[0031] Furthermore, the antifreeze is selected from one or more of alcohols, alcohol ethers, chlorinated hydrocarbons, and inorganic salts; and / or

[0032] Furthermore, the defoamer is selected from C 10 -C 20 One or more of the following: saturated fatty acid compounds, silicone oil, silicone compounds, and C8-C10 fatty alcohols; and / or

[0033] Further, 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

[0034] Further, 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

[0035] Further, 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

[0036] Furthermore, the synergist is selected from synergistic phosphorus, synergistic ether; and / or

[0037] Furthermore, 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.

[0038] Furthermore, the herbicidal composition can be prepared into an agriculturally permissible formulation.

[0039] Furthermore, the herbicide composition can be formulated into solid and / or liquid formulations;

[0040] Furthermore, the solid dosage form is any one of powder, granules, wettable powder, water-dispersible granules, soluble powder, and soluble granules;

[0041] Furthermore, the liquid formulation is any one of emulsifiable concentrate, suspension concentrate, aqueous solution, water emulsion, microemulsion, soluble concentrate, and dispersible oil suspension;

[0042] Furthermore, the dosage form is any one of emulsifiable concentrate, suspension concentrate, wettable powder, water-dispersible granules, and dispersible oil suspension;

[0043] Furthermore, the composition is an emulsifiable concentrate, and the components and contents of the emulsifiable concentrate are preferably: 0.1 to 100 parts of active ingredient A, 0.1 to 100 parts of active ingredient B, 0.1 to 20 parts of emulsifier, and the remainder is made up with solvent;

[0044] Furthermore, the composition is a suspending agent, and the components and contents of the suspending agent are preferably as follows: 0.1-100 parts of active ingredient A, 0.1-100 parts of active ingredient B, 1-15 parts of dispersant, 0.5-20 parts of emulsifier, 1-10 parts of wetting agent, 1-10 parts of thickener, 0-10 parts of antifreeze, and deionized water to make up the balance;

[0045] Furthermore, the composition is a wettable powder, and the components and contents of the wettable powder are preferably: 0.1-100 parts of active ingredient A, 0.1-100 parts of active ingredient B, 1-20 parts of dispersant, 1-15 parts of wetting agent, and filler to make up the balance;

[0046] Furthermore, the composition is a water-dispersible granule, and the components and contents of the water-dispersible granule are preferably as follows: 0.1-100 parts of active ingredient A, 0.1-100 parts of active ingredient B, 1-15 parts of dispersant, 1-10 parts of wetting agent, 1-15 parts of disintegrant, 1-10 parts of binder, and filler to make up the balance.

[0047] Furthermore, the composition is a dispersible oil suspension, and the components and contents of the dispersible oil suspension are preferably as follows: active ingredient A 0.1-100 parts, active ingredient B 0.1-100 parts, dispersant 1-15 parts, emulsifier 0.5-20 parts, wetting agent 1-10 parts, thickener 1-10 parts, antifreeze 0-10 parts, and the remaining amount is made up by the dispersion medium;

[0048] The herbicidal composition described above is used for the control of unwanted plants;

[0049] Furthermore, the unwanted plants are annual weeds and / or perennial weeds;

[0050] Furthermore, unwanted plants are annual weeds and / or perennial weeds belonging to the Poaceae, Rubiaceae, Euphorbiaceae, Cyperaceae, Asteraceae, Polygonaceae, Scrophulariaceae, Solanaceae, Amaranthaceae, Caryophyllaceae, Brassicaceae, Lamiaceae, Fabaceae, Convolvulaceae, Boraginaceae, Commelinaceae, Malvaceae, and Chenopodiaceae families.

[0051] Annual or perennial weeds such as: Wild oats (Avena fatua), wild oats (Alopecurus aequalis), annual bluegrass (Poa annua), hard grass (Selerochloa kengiana), purslane (Beckmannia syzigachne), sorghum (Polypogon fugax), bromegrass (Bromus japonicas), cleavers (Galium aparine), helioscopia (Euphorbia helioscopia), persian speedwell (Veronica persica), cowherb (Malachium aquaticum), sileneconoidea (Sileneconoidea), vaccaria segetalia (Vaccaria segetalia), descurainia sophia (Descurainia sophia), thlaspiarvense (Thlaspiarvense), capsella bursa-pastoris (Capsella bursa-pastoris), lamium amplexicaule (Lamium amplexicaule), viciasativa (Viciasativa), bindweed (Calystegia hederacea), and celery stalk (Cerastium). viscosum, Stellaria alsine, Lithospermum arvense, Bothriospermum tenellum, Digitaria sanguinalis, Eleusine indica, Setaria viridis, Cyperus rotundus, Eclipta prostrata, Cephalanoplos segetum, Amaranthus retroflexus, Alternanthera philoxeroides, Portulaca oleracea, Solanum nigrum, Physalis angulata, Acalypha australis, Celosia argentea, Amaranthus spinosus, Xanthium sibiricum, Ageratum conyzoides, Commelina communis, Echinochloa crus-galli, Paspalum distichum, Alopecurus japonicus, Abutilontheophrasti, Chenopodium album, Rumexcrispus, Cassia tora, Stellaria media, Cerastium arvense, Veronica didyma, Erigeronannuus, Vicia sativa, Arabidopsis thaliana, Cyperus iria, Cyperus difformis, Polygonum hydropiper, Leptochloa chinensis, Cynodon dacylon, Euphorbia maculata, Cuscuta chinensis, Lapsana apogonoides, Sonchus oleraceus, Lxeris chinensis, Imperata cylindrical, Conyza canadensis, Humulus scandens, Cayratia japonica, Conyza bonariensis, Artemisia argyi, Artemisia annua, Ixeris sonchifolia;

[0052] Furthermore, unwanted plant growing locations include soybean fields, corn fields, peanut fields, wheat fields, rice paddies, vegetable fields, and orchards;

[0053] Furthermore, the unwanted growing environment is rice paddies.

[0054] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0055] 1) Significantly improves the prevention and control effect;

[0056] 2) It broadened the spectrum of weed control;

[0057] 3) Delays the development of resistance in weeds to active ingredients;

[0058] 4) It reduces the amount of pesticides used, thereby reducing costs and environmental impact. Detailed Implementation

[0059] 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.

[0060] Formulation preparation examples

[0061] To better illustrate the present invention, the following description, in conjunction with embodiments, further explains the content of the present invention.

[0062] Preparation Example 1

[0063] 7.5% Formula (I) compound oxadiazon emulsifiable concentrate (1+6.5)

[0064] Formula composition: 1% compound of formula (I), 6.5% oxadiazon, 20% dimethyl sulfoxide, 5% fatty alcohol polyoxyethylene ether, 7.5% styrene-phenol polyoxyethylene ether, 1% calcium dodecylbenzenesulfonate, 10% cyclohexanone, 10% N-methylpyrrolidone, methyl oleate to make up the balance;

[0065] Preparation method: Add the active ingredients to the carrier according to the formula ratio, and add surfactants and other functional additives to it. Stir and mix evenly in a mixing tank to obtain the emulsifiable oil product.

[0066] Preparation Example 2

[0067] 10% Formula (I) Compound·Propyonoxadiazon EC (1+9)

[0068] Formulation composition: 1% compound of formula (I), 9% propyne oxadiazon, 15% dimethyl sulfoxide, 6% fatty alcohol polyoxyethylene ether, 2.5% styrene-phenol polyoxyethylene ether, 3% alkylphenol polyoxyethylene polyoxypropylene ether, 0.5% calcium dodecylbenzenesulfonate, 10% cyclohexanone, 10% N-methylpyrrolidone, methyl oleate to make up the balance;

[0069] Preparation method: Add the active ingredients to the carrier according to the formula ratio, and add surfactants and other functional additives to it. Stir and mix evenly in a mixing tank to obtain the emulsifiable oil product.

[0070] Preparation Example 3

[0071] 20% Formula (I) Compound·Oxadiazon Suspension (2+18)

[0072] Formula composition: 2% compound of formula (I), 18% oxadiazon, 1% sodium lignosulfonate, 1% sodium polycarboxylate, 4% styrene-phenol polyoxyethylene ether sulfate, 2% block polyether, 0.4% magnesium aluminum silicate, 0.3% xanthan gum, 1% sodium p-hydroxybenzoate, 0.5% silicone oil, 5% ethylene glycol, deionized water to make up the balance;

[0073] Preparation method: According to the formula ratio, mix water, dispersant, and wetting agent evenly. Add other functional additives while stirring, and mix evenly by high-speed shearing. Then add the active ingredient and continue shearing and mixing. Then grind in a horizontal sand mill, controlling the particle size of the material to be below 90% of the size. Finally, add the thickener and shear evenly to obtain the suspension product.

[0074] Preparation Example 4

[0075] 33% Formula (I) Compound·Cyclooxazol Suspension (3+30)

[0076] Formula composition: 3% compound of formula (I), 30% cyclopentoxaflutole, 3% dodecyl polyoxyethylene ether phosphate, 2% sodium alkyl polyoxyethylene ether sulfonate, 2% fatty alcohol polyoxyethylene ether, 1% sodium polycarboxylate, 0.4% magnesium aluminum silicate, 2% methylparaben, 0.2% xanthan gum, 0.5% silicone oil, 5% glycerin, deionized water to make up the balance;

[0077] Preparation method: According to the formula ratio, mix water, dispersant, and wetting agent evenly. Add other functional additives while stirring, and mix evenly by high-speed shearing. Then add the active ingredient and continue shearing and mixing. Then grind in a horizontal sand mill, controlling the particle size of the material to be below 90% of the size. Finally, add the thickener and shear evenly to obtain the suspension product.

[0078] Preparation Example 5

[0079] 60% Formula (I) Compound·Propylene Oxadiazon Wettable Powder (4+56)

[0080] Formula composition: 4% compound of formula (I), 56% propyne oxadiazon, 5% alkylnaphthalene formaldehyde condensate calcium sulfonate, 5% alkylphenol polyoxyethylene ether sodium sulfonate, 2% alkylnaphthalene sulfonate sodium, 2% sodium dodecyl sulfate, 5% attapulgite, kaolin to make up the balance;

[0081] Preparation method: Add the active ingredients to the carrier according to the formula ratio, and add surfactants and other functional additives to it. Mix, pulverize by air jet and mix again to obtain a wettable powder product.

[0082] Preparation Example 6

[0083] 28% Formula (I) Compound·Propyonoxadiazon Water Dispersible Granules (3+25)

[0084] Formula composition: 3% compound of formula (I), 25% propyne oxadiazon, 5% sodium alkyl naphthalene sulfonate, 5% sodium lignin sulfonate, 3% sodium alkyl sulfate, 2% sodium naphthalene sulfonate, 4% sodium carboxymethyl cellulose, 2.5% starch, 10% silica, and kaolin to make up the balance;

[0085] Preparation method: 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.

[0086] Preparation Example 7

[0087] 25% Formula (I) compound · propyne oxadiazon dispersible oil suspension (2.5+22.5)

[0088] Formula composition: 2.5% compound of formula (I), 22.5% propyne oxadiazon, 2% sodium diisooctyl succinate sulfonate, 2% fatty alcohol polyoxyethylene ether, 15% castor oil polyoxyethylene ether, 3% calcium dodecylbenzene sulfonate, 2% styrene-phenol polyoxyethylene ether, 0.3% organic bentonite, 5% corn oil, soybean oil to make up the balance;

[0089] Preparation method: According to the formula ratio, the active ingredients, surfactants and other functional additives are placed in the reaction vessel in sequence, the oil phase is mixed evenly, and after high-speed shearing, wet sand milling, and finally homogenization filtration, the dispersible oil suspension product is obtained.

[0090] Indoor activity test

[0091] Test basis:

[0092] NY / T 1155.5-2006 "Guidelines for Indoor Bioassay Testing of Pesticides - Herbicides Part 5: Soil Activity Tests for Paddy Field Herbicides - Irrigation Method";

[0093] NY / T 1155.7-2006 "Guidelines for Indoor Bioassay Testing of Pesticides - Herbicides - Part 7: Determination of Combined Effects of Mixtures".

[0094] Experimental targets: barnyard grass, goosegrass, calla lily, iron amaranth, and sedge;

[0095] Test reagents: Oxalide technical, propyzoxystrobin technical, cyclopentoxaflutole technical, and compound (I) technical. All of the above technicals were provided by the Group's R&D Center.

[0096] Instruments and equipment: light incubator, spray tower, electronic balance, pipettes, etc.;

[0097] Test materials: The test soil was quantitatively filled to 3 / 4 of the pot, and then watered from the top to completely saturate the soil. The pretreated test weed seeds were evenly sown on the soil surface (the density of the control weeds was ensured to be 120 to 150 plants per square meter based on the germination rate). The seeds were covered with soil 0.5 cm to 2.0 cm thick, depending on their size. The seeds were ready for use 24 hours after sowing.

[0098] Preparation of reagents: Water-soluble reagents should be dissolved and diluted directly with water. Other reagents should be dissolved in a suitable solvent (acetone, dimethylformamide, or dimethyl sulfoxide, etc.) and diluted with a 0.1% Tween 80 aqueous solution.

[0099] Chemical treatment:

[0100] Before treatment, irrigate to maintain a water layer of 1 cm to 2 cm. Use a pipette to take a quantitative amount of the drug solution and irrigate according to the experimental design, from low dose to high dose. Each treatment should be replicated at least 4 times, and a blank control should be set up with no drug.

[0101] After treatment, the cells were transferred to normal temperature incubation, maintaining a water layer of 1-2 cm throughout the experiment. A digital temperature and humidity recorder was used to record the dynamic temperature and humidity data within the greenhouse during the experiment.

[0102] Survey: After treatment, regularly observe and record weed emergence and post-emergence growth. 14 days after treatment, survey and record weed control activity, and describe symptoms of damage such as dwarfing, deformity, and bleaching.

[0103] Control efficacy E = (Number of weeds in control area - Number of weeds in treatment area) / Number of weeds in control area × 100

[0104] Data statistics and analysis:

[0105] Gowing method

[0106] The theoretical control efficacy of the mixture E0 = weed control efficacy when the dosage of herbicide A is P + weed control efficacy when the dosage of herbicide B is Q - weed control efficacy when the dosage of herbicide A is P × weed control efficacy when the dosage of herbicide B is Q ÷ 100;

[0107] Evaluation criteria for the combined effects of mixed drugs: E-E0 > 10% indicates synergistic effect, E-E0 < -10% indicates antagonistic effect, and E-E0 between ±10% indicates additive effect.

[0108] Experimental results:

[0109] Indoor activity tests showed that compound (I) mixed with one of the following: oxadiazon, propyzinoxadiazon, or cyclopentoxadiazon exhibited good indoor activity against common weeds such as barnyard grass, goosegrass, calla lily, ironweed, and sedge.

[0110] As shown in Tables 1-5, the mass ratios of compound (I) to oxadiazon at 2.5:50, 2.5:100, 7.5:50, 7.5:100, 7.5:150, 12.5:50, 12.5:100, and 12.5:150 exhibited synergistic effects on barnyard grass, goosegrass, calla lily, ironweed, and sedge; the mass ratios of compound (I) to propyzinoxadiazon at 2.5:15, 2.5:45, 7.5:15, 7.5:45, and 7.5:15 showed synergistic effects. The ratios of compound (Ⅰ) to cyclopentadiazon (2.5:75, 12.5:15, 12.5:45, and 12.5:75) showed synergistic effects on barnyard grass, goosegrass, calla lily, ironweed, and sedge. The mass ratios of compound (Ⅰ) to cyclopentadiazon (2.5:50, 2.5:100, 7.5:50, 7.5:100, 7.5:150, 12.5:50, 12.5:100, and 12.5:150) also showed synergistic effects on barnyard grass, goosegrass, calla lily, ironweed, and sedge.

[0111] Table 1. Combined effects of various mixed formulations with barnyardgrass

[0112]

[0113]

[0114] Table 2. Combined effects of various mixed combinations with *Eleusine indica*

[0115]

[0116]

[0117] Table 3. Combined effects of various mixed pairs on calla lily

[0118]

[0119]

[0120] Table 4. Combined effects of various mixed combinations on amaranth.

[0121]

[0122] Table 5. Combined effects of various blends with different types of Cyperus alternifolius

[0123]

[0124] Field efficacy trials

[0125] Test location: Hekou Town, Xundian County, Kunming City, Yunnan Province.

[0126] Target crop: The experimental field has unobstructed ditches, convenient irrigation and drainage, and the soil is loam with moderate fertility;

[0127] Transplanting time: April 15, 2022. Rice seedlings were transplanted with a plant spacing of 15cm × 10cm, in single rows, with 2-3 seedlings per clump, and a basic seedling density of 1.2 million plants / hm². 2 .

[0128] The main weeds in the experimental field were barnyard grass, duckweed, water plantain, wild purslane, sedge, hairy caltrop, and ironweed, which met the experimental requirements.

[0129] Experimental agents: The experiment included 7 treatments, manual weeding and no weeding. The specific experimental treatment settings are shown in the table below.

[0130] Table 6 Experimental Treatment Design

[0131]

[0132] Experimental design: Each plot area is 20m² 2 Repeated 4 times, 36 cells, randomized block arrangement.

[0133] Application time and method: Spray herbicide 7 days before rice transplanting and treat the soil.

[0134] Field survey methods: The efficacy of herbicide on individual weed plants was assessed 28 and 42 days after application, and the efficacy on fresh weight was assessed 42 days after application. Five samples were taken from each plot, with each sample measuring 0.25m. 2 Types and number of weeds in the area.

[0135] Observe the growth of rice at 1, 5, 10 and 20 days after transplanting, and measure the yield at harvest. If pesticide damage occurs, record the symptoms and conduct a graded investigation.

[0136] Each community was assigned a score based on its pesticide damage classification method:

[0137] Level 1: The crop is growing normally and there are no symptoms of pesticide damage.

[0138] Level 2: Slight pesticide damage to crops, with damage less than 10%;

[0139] Level 3: Moderate pesticide damage to crops, which can recover later and will not affect yield;

[0140] Level 4: Severe pesticide damage to crops, difficult to recover from, resulting in reduced yield;

[0141] Level 5: The crop is severely damaged by pesticides and cannot recover; weeds cause significant yield reduction or complete crop failure.

[0142] The control efficacy and fresh weight control efficacy of each treatment were calculated using the following formulas:

[0143] Control efficacy (%) = (Number of weeds in the blank control area - Number of weeds in the treatment area) / Number of weeds in the blank control area × 100;

[0144] Fresh weight control efficacy (%) = (fresh weight of weeds in the control area - fresh weight of weeds in the treatment area) / fresh weight of weeds in the control area × 100

[0145] Data statistics and analysis:

[0146] Data analysis was performed using SPSS 20.0, and the differences between treatments were compared using Duncan's new multiple range method (significance level P < 0.05).

[0147] Results and Analysis:

[0148] Field surveys revealed that the main weed communities in the experimental plots were *Gnaphalium affine*, *Monochoria vaginalis*, *Alisma plantago-aquatica*, *Amaranthus chinensis*, and *Cyperus difformis*.

[0149] As shown in Table 7, 28 days after application, the control efficacy of 7.5% compound (I)·oxadiazon EC (1+6.5), 33% compound (I)·cyclopentoxadiazon SC (3+30), and 28% compound (I)·propyneoxadiazon WAFORT (3+25) against weeds in paddy fields was 97.2%, 96.5%, and 98.4%, respectively. The mixed formulations were significantly more effective than the single formulations.

[0150] Table 7. Weed control efficacy (%) in paddy fields under different treatments 28 days after application.

[0151]

[0152] As shown in Table 8, 42 days after application, the control efficiencies of 7.5% Compound (I)·Oxadiazon EC (1+6.5), 33% Compound (I)·Cyclooxadiazon SC (3+30), and 28% Compound (I)·Propyonoxadiazon WASC (3+25) against weeds in paddy fields were 91.3%, 90.8%, and 93.4%, respectively. Through differential comparison, the results showed that 28% Compound (I)·Propyonoxadiazon WASC (3+25) performed best.

[0153] Table 8. Weed control efficacy (%) in paddy fields for each treatment 42 days after application.

[0154]

[0155]

[0156] As shown in Table 9, 42 days after application, the total weed fresh weight control efficacy of 7.5% compound (I)·oxadiazon EC (1+6.5), 33% compound (I)·cyclopentoxadiazon SC (3+30), and 28% compound (I)·propyneoxadiazon WAFORT (3+25) were 88.92%, 91.05%, and 88.68%, respectively, demonstrating excellent control effects.

[0157] Table 9. Weed control efficacy and fresh weight at 42 days post-application.

[0158]

[0159] Safety to rice: During the experiment, visual observation showed no significant difference in rice growth, plant height, and number of new roots between the rice in each treatment plot and the control plot, indicating that no phytotoxicity occurred in any treatment.

[0160] In summary, the herbicidal composition of the present invention is a combination of compound (I) and any one of oxadiazon, cyclopentoxadiazon, or propyzinoxadiazon. Its activity and herbicidal effect are not a simple summation of the activities of each component. Compared with existing single formulations, it has significant control effect on plots with mixed occurrences of various grass and broadleaf weeds, significant synergistic effect, can delay resistance, low pesticide residue, good safety, and meets the safety requirements of pesticide formulations.

[0161] 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 based on the present invention, 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 composition comprises active ingredient A and active ingredient B, wherein active ingredient A is a compound of formula (I): (I) Active ingredient B is selected from one or more of oxadiazon, propyzoxystrobin, and cyclopentoxadiazon; The mass ratio of the compound of formula (I) to oxadiazon is 1:40 to 1:4; The mass ratio of the compound of formula (I) to propyne oxadiazon is 1:18 to 5:6; The mass ratio of the compound of formula (Ⅰ) to cyclopentoxane is 1:40 to 1:

4.

2. The herbicidal composition according to claim 1, characterized in that, The mass ratio of the compound of formula (I) to oxadiazon is 2.5:50, 2.5:100, 7.5:50, 7.5:100, 7.5:150, 12.5:50, 12.5:100, and 12.5:

150. The mass ratio of the compound of formula (I) to propyzinoxadiazon is 2.5:15, 2.5:45, 7.5:15, 7.5:45, 7.5:75, 12.5:15, 12.5:45, and 12.5:

75. The mass ratio of the compound of formula (I) to cyclopentoxane is 2.5:50, 2.5:100, 7.5:50, 7.5:100, 7.5:150, 12.5:50, 12.5:100, and 12.5:

150.

3. The herbicidal composition according to claim 1, characterized in that, The combined mass of active ingredient A and active ingredient B accounts for 1% to 90% of the composition.

4. The herbicidal composition according to claim 1, characterized in that, The combined mass of active ingredient A and active ingredient B constitutes 5% to 85% of the composition.

5. The herbicidal composition according to claim 1, characterized in that, In addition to the active ingredient, the herbicidal composition also includes 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, binders, or fillers.

6. The herbicidal composition according to claim 5, characterized in that, The herbicidal composition is formulated into any one of the following formulations: emulsifiable concentrate, suspension concentrate, wettable powder, water-dispersible granules, and dispersible oil suspension.

7. The use of the herbicidal composition according to any one of claims 1-6 for controlling unwanted plants, characterized in that, The unwanted plants mentioned are barnyard grass, goosegrass, calla lily, ironweed, and sedge.

8. The use according to claim 7, characterized in that, The unwanted plants were growing in rice paddies.

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