A herbicidal composition and use thereof

Abstract

The application discloses a kind of herbicidal compositions, 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 pendimethalin, flufenacet and oxaziclomefone.The mass ratio of active ingredient A and active ingredient B of the composition is 1:50-50:1.The component of the application is reasonable, and the activity and herbicidal effect are not simply superimposed of each component, compared with single preparation, with the characteristics of significant herbicidal effect, low drug dosage, broad spectrum of weeds, 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. Background Technology

[0002] Rice is one of my country's most important food crops, and due to my country's large population, it ranks first in the world in rice consumption. Currently, common weeds in rice paddies include those belonging to the Poaceae, Pontederiaceae, Alismataceae, Cyperaceae, and Asteraceae families. These weeds are highly adaptable to adverse environments and have a strong reproductive and regenerative capacity. They can emerge at different times, and their vigorous growth can inhibit the growth of major cultivated crops, affecting not only the quality and yield of rice but also impacting the ecological environment by spreading pests and diseases, ultimately threatening human safety.

[0003] Pendimethalin primarily inhibits the division of meristematic cells and does not affect the germination of weed seeds. Instead, it takes effect after the seedlings, stems, and roots absorb the drug during the germination process. In dicotyledonous plants, the hypocotyl is the site of absorption, while in monocotyledonous plants it is the seedling. The symptoms of damage include inhibited growth of the seedlings and secondary roots.

[0004] Flufenacet belongs to the aryloxyacetamide class of compounds and has advantages such as high herbicidal activity, low toxicity, broad spectrum, wide applicability to crops, and high safety. It is mainly used on crops such as corn, rice, tomatoes, potatoes, and peanuts, and can effectively control many annual grass weeds, sedges, and some small broadleaf weeds.

[0005] Oxaziclomefone, developed by Mitsubishi Oil & Chemical Co., Ltd. of Japan, is a novel systemic oxaziclomefone herbicide primarily used to control important broadleaf weeds, sedges, and barnyard grass. It is absorbed through the roots and base of the stems and leaves of the weeds, inhibiting the growth of target plant cells, leading to chlorosis, cessation of growth, and eventual death of the stems and leaves.

[0006] Herbicides containing a single active ingredient have varying degrees of shortcomings in weed control. Continuous use can easily lead to herbicide resistance in weeds, resulting in reduced activity and a narrowed spectrum of herbicides. Combining herbicides with different mechanisms of action is a reasonable and effective method to improve weed control, broaden the spectrum of herbicides, delay the development of weed resistance, reduce pesticide usage costs, and decrease herbicide residues. The applicant unexpectedly discovered that mixing compound (I) with one or more of pendimethalin, fluthiamethoxam, and oxadiazon significantly enhances the control of various annual or perennial weeds, while also reducing dosage, lowering control costs, and ensuring crop safety. Furthermore, a search revealed no reports of weed control using mixtures of compound (I) with one or more of pendimethalin, fluthiamethoxam, and oxadiazon. Summary of the Invention

[0007] 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.

[0008] Another object of the present invention is to provide a herbicidal composition formulation containing a compound of formula (I) and fluthiamethoxam, oxadiazon, or pendimethalin.

[0009] Another object of the present invention is to provide the above-mentioned herbicidal composition for the control of annual or perennial weeds in rice paddies.

[0010] 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):

[0011] Active ingredient B is selected from one or more of pendimethalin, fluthiamethoxam, and oxadiazon;

[0012] Furthermore, the weight ratio of active ingredient A to active ingredient B in the herbicidal composition is 1:50-50:1;

[0013] Furthermore, the mass ratio of the compound of formula (I) to dimethylpentylamine is 1:50-20:1;

[0014] Furthermore, the mass ratio of the compound of formula (I) to dimethylpentylamine is 1:40-5:1;

[0015] Furthermore, the mass ratio of the compound of formula (I) to dimethylpentyl is 3:30, 3:60, 3:120, 6:30, 6:60, 6:120, 12:30, 12:60, or 12:120;

[0016] Furthermore, the mass ratio of the compound of formula (I) to dimethylpentylamine is 3:30, 3:60, 6:30, 6:60, 6:120, 12:60, or 12:120;

[0017] Furthermore, the mass ratio of the compound of formula (I) to fluthiamethoxam is 1:40-20:1;

[0018] Furthermore, the mass ratio of the compound of formula (I) to fluthiamethoxam is 1:30-10:1;

[0019] Further, the mass ratio of the compound of formula (I) to fluthiamethoxam is 3:22.5, 3:45, 3:90, 6:22.5, 6:45, 6:90, 12:22.5, 12:45, 12:90;

[0020] Furthermore, the mass ratio of the compound of formula (I) to fluthiamethoxam is 3:22.5, 3:45, 3:90, 6:22.5, 6:45, 6:90, 12:45, or 12:90;

[0021] Furthermore, the mass ratio of the compound of formula (I) to oxadiazon is 1:20-10:1;

[0022] Furthermore, the mass ratio of the compound of formula (I) to oxadiazon is 1:10-10:1;

[0023] Furthermore, the mass ratio of the compound of formula (I) to oxadiazon is 3:6, 3:12, 3:24, 6:6, 6:12, 6:24, 12:6, 12:12, or 12:24.

[0024] Furthermore, the mass ratio of the compound of formula (I) to oxadiazon is 3:6, 3:12, 6:6, 6:12, 6:24, 12:6, 12:12, or 12:24.

[0025] Furthermore, the active ingredient A and active ingredient B together constitute 10% to 90% of the composition;

[0026] Furthermore, the combined mass of active ingredient A and active ingredient B constitutes 20% to 60% of the composition;

[0027] 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.

[0028] 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

[0029] 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

[0030] 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

[0031] 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

[0032] 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

[0033] Furthermore, the antifreeze is selected from one or more of alcohols, alcohol ethers, chlorinated hydrocarbons, and inorganic salts; and / or

[0034] 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

[0035] 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

[0036] 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

[0037] 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

[0038] Furthermore, the synergist is selected from synergistic phosphorus, synergistic ether; and / or

[0039] 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.

[0040] Furthermore, the herbicidal composition can be prepared into an agriculturally permissible formulation.

[0041] Furthermore, the herbicide composition can be formulated into solid and / or liquid formulations;

[0042] Furthermore, the solid dosage form is any one of powder, granules, wettable powder, water-dispersible granules, soluble powder, and soluble granules;

[0043] Furthermore, the liquid formulation is any one of emulsifiable concentrate, suspension concentrate, aqueous solution, water emulsion, microemulsion, soluble concentrate, and dispersible oil suspension;

[0044] Furthermore, the dosage form is any one of emulsifiable concentrate, suspension concentrate, wettable powder, water-dispersible granules, and dispersible oil suspension;

[0045] 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;

[0046] 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;

[0047] 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;

[0048] 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.

[0049] 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;

[0050] The herbicidal composition described above is used for the control of unwanted plants;

[0051] Furthermore, the unwanted plants are annual weeds and / or perennial weeds;

[0052] 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.

[0053] 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;

[0054] Furthermore, unwanted growing locations include rice paddies, cornfields, peanut fields, wheat fields, soybean fields, vegetable fields, and orchards;

[0055] Furthermore, the unwanted growing environment is rice paddies.

[0056] The beneficial effects of this invention are:

[0057] The herbicidal composition of the present invention can improve herbicidal activity and has a significant synergistic effect;

[0058] The herbicidal composition of this invention can control a variety of weeds in the field, expanding the spectrum of weed control and making up for the shortcomings of single agents having poor control efficacy against a single weed.

[0059] The herbicidal composition of the present invention is safe for rice, effectively reduces application costs, and improves economic benefits. Detailed Implementation

[0060] 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.

[0061] Formulation preparation examples

[0062] To better illustrate the present invention, the following description, in conjunction with embodiments, further explains the content of the present invention.

[0063] Preparation Example 1

[0064] 24% Formula (I) Compound·Dimethomorph EC (4+20)

[0065] Formula composition: 4% compound of formula (I), 20% dimethyl pentylene, 10% dimethyl sulfoxide, 10% styrene-phenol polyoxyethylene ether, 0.5% calcium dodecylbenzenesulfonate, 14% propylene carbonate, xylene to make up the balance;

[0066] Preparation method: According to the formula ratio, the measured active ingredients, solvents and additives are added to the mixing tank and stirred to dissolve them. Then, the emulsifier is added, and the remaining solvent is used to make up the balance. The mixture is stirred evenly in the mixing tank and filtered to obtain the emulsifiable oil required by this invention.

[0067] Preparation Example 2

[0068] 31% Formula (I) Compound·Flumethoxam EC (1+30)

[0069] Formulation composition: 1% compound of formula (I), 30% fluthiamethoxam, 15% dimethyl sulfoxide, 14% styrene-phenol polyoxyethylene ether, 2% calcium dodecylbenzenesulfonate, 20% propylene carbonate, xylene to make up the balance;

[0070] Preparation method: Same as in preparation example 1.

[0071] Preparation Example 3

[0072] 27% Formula (I) Compound·Oxadiazon EC (3+24)

[0073] Formulation composition: 3% of compound (I), 24% oxadiazon, 11% dimethyl sulfoxide, 10.5% styrene-phenol polyoxyethylene ether, 0.5% calcium dodecylbenzenesulfonate, 14% propylene carbonate, xylene to make up the balance;

[0074] Preparation method: Same as in preparation example 1.

[0075] Preparation Example 4

[0076] 42% Formula (I) Compound·Dimethomorph Suspension (2+40)

[0077] Formula composition: 2% compound of formula (I), 40% fluthiamethoxam, 2% phosphate ester, 2% fatty alcohol polyoxyethylene ether, 3% polycarboxylate, 0.1% xanthan gum, 5% glycerol, 0.5% magnesium aluminum silicate, 0.5% silicone defoamer, deionized water to make up the balance;

[0078] Preparation method: According to the formula ratio, the active ingredients, surfactants and other functional additives are placed in the reaction vessel in sequence, water is added and mixed evenly, and then subjected to high-speed shearing, wet sand milling and finally homogenization filtration to obtain the suspension product.

[0079] Preparation Example 5

[0080] 42.5% (I) Compound·Flumethoxam Suspension (5:37.5)

[0081] Formulation: 5% compound (I), 37.5% fluthiamethoxam, 2% phosphate ester, 2% fatty alcohol polyoxyethylene ether, 3% polycarboxylate, 0.1% xanthan gum, 5% glycerol, 0.5% magnesium aluminum silicate, 0.5% organosilicon defoamer, deionized water to make up the balance;

[0082] Preparation method: Same as in preparation example 4.

[0083] Preparation Example 6

[0084] 45% Formula (I) Compound·Oxadiazon Suspension (5+40)

[0085] Formula composition: 5% compound of formula (I), 40% oxadiazon, 2% phosphate ester, 2% fatty alcohol polyoxyethylene ether, 3% polycarboxylate, 0.1% xanthan gum, 5% glycerol, 0.5% magnesium aluminum silicate, 0.5% organosilicon defoamer, deionized water to make up the balance;

[0086] Preparation method: Same as in preparation example 4.

[0087] Preparation Example 7

[0088] 36% Formula (I) Compound·Dimethylpentylamine Dispersible Oil Suspension (6+30)

[0089] Formulation: 6% compound of formula (I), 30% dimethylpentylene, 3% sodium dodecylbenzenesulfonate, 2% polycarboxylate, 15% polyol fatty acid esters and their ethylene oxide adducts, 5% castor oil polyoxyethylene ether, 1% organobentonite, 1% fumed silica, and soybean oil to make up the balance.

[0090] Preparation method: According to the formula ratio, the active ingredients, surfactants and other functional additives are placed in a reaction vessel in sequence, mixed evenly, and then wet-milled using a sand mill with zirconium beads after high-speed shearing until D. 90 If 90% of the particles have a diameter of less than 5 μm, a dispersible oil suspension product can be prepared.

[0091] Preparation Example 8

[0092] 48% Formula (I) Compound·Fluorthiamethoxam Dispersible Oil Suspension (3+45)

[0093] Formula composition: 3% compound of formula (I), 45% fluthiamethoxam, 4% sodium dodecylbenzenesulfonate, 3% polycarboxylate, 15% polyol fatty acid esters and their ethylene oxide adducts, 5% castor oil polyoxyethylene ether, 1% organobentonite, 1% fumed silica, and corn oil to make up the balance.

[0094] Preparation method: Same as in preparation example 7.

[0095] Preparation Example 9

[0096] 36% of compound (I) · Oxadiazon is a dispersible oil suspension (18+18).

[0097] Formula composition: 18% compound of formula (I), 18% oxazinone, 3% sodium dodecylbenzenesulfonate, 2% polycarboxylate, 15% polyol fatty acid ester and its ethylene oxide adduct, 5% castor oil polyoxyethylene ether, 1% organobentonite, 1% fumed silica, corn oil to make up the balance.

[0098] Preparation method: Same as in preparation example 7.

[0099] Activity test

[0100] Test basis: NY / T 1155.4-2006 "Guidelines for Indoor Bioassay of Pesticides - Herbicides Part 4: Determination of Herbicide Activity by Foliar Spray Method"; NY / T 1155.7-2006 "Guidelines for Indoor Bioassay of Pesticides - Herbicides Part 7: Determination of Combined Effects of Mixtures".

[0101] Experimental method: potted plant method

[0102] Experimental targets: Echinochloa crus-galli, barnyard grass, crabgrass, carp intestine, Polygonum hydropiper, duckweed, and flat-stemmed purslane;

[0103] Test reagents: 95% pendimethalin technical grade, 95% fluthiamethoxam technical grade, 95% oxadiazon technical grade, and 95% compound (I) technical grade. All of the above technical grades were provided by the Group's R&D Center.

[0104] Instruments and equipment: light incubator, spray tower, electronic balance, pots (9cm in diameter), beakers, pipettes;

[0105] Experimental materials: Test soil was quantitatively filled to 4 / 5 of the pot's capacity. Bottom irrigation was used to ensure the soil was completely moistened. Pretreated weed seeds were evenly sown on the soil surface, covered with 0.5cm–2.0cm of soil depending on seed size, and then transplanted to a greenhouse for conventional cultivation. Weeds in dryland fields were irrigated from the bottom of the pot, while weeds in paddy fields were irrigated from the top until saturated. After emergence, thinning was performed to ensure uniform weed density.

[0106] Preparation of reagents: Water-soluble reagents should be dissolved and diluted directly with water. Other reagents should be dissolved in a suitable solvent (such as dimethylformamide or dimethyl sulfoxide) and diluted with a 0.1% Tween 80 aqueous solution.

[0107] Chemical treatment: Standardized spraying was conducted, with foliar spraying performed in sequence from low to high doses according to the experimental design. Each treatment was replicated at least four times, and a control group without the chemical treatment was included. The plants were cultivated in a greenhouse. When the weeds reached the 1-3 leaf stage, 20 plants were planted per pot for grasses and sedges, and 8 plants per pot for broadleaf weeds, and then sprayed.

[0108] After treatment, the surface of the test materials was allowed to air dry naturally before being transferred to a greenhouse for routine cultivation. Weeds in dry fields were irrigated by drip irrigation from the bottom of the pots, while weeds in paddy fields were irrigated by top irrigation until saturation.

[0109] Survey: The growth status of the tested weeds was observed and recorded regularly after treatment. 14 days after treatment, weed control activity, the number of surviving weeds, and the symptoms of damage were investigated and recorded using visual inspection and absolute value (numerical measurement) methods.

[0110] The main symptoms are:

[0111] —Color changes (yellowing, whitening, etc.);

[0112] —Morphological changes (deformed or twisted new leaves, etc.);

[0113] —Growth changes (dehydration, wilting, dwarfing, clustering, etc.).

[0114] Visual inspection method:

[0115] The herbicidal activity of the herbicide is evaluated based on the symptoms and severity of weed damage to the test target.

[0116] The following unified grading method can be used for the survey:

[0117] Level 1: All dead;

[0118] Level 2: Equivalent to 0-2.5% of the weeds in the blank control area;

[0119] Level 3: Equivalent to 2.6%-5% of the weeds in the blank control area;

[0120] Level 4: Equivalent to 5.1%-10% of the weeds in the blank control area;

[0121] Level 5: Equivalent to 10.1%-15% of the weeds in the blank control area;

[0122] Level 6: Equivalent to 15.1%-25% of the weeds in the blank control area;

[0123] Level 7: Equivalent to 25.1%-35% of the weeds in the blank control area;

[0124] Level 8: Equivalent to 35.1%-67.5% of the weeds in the blank control area;

[0125] Level 9: Equivalent to 67.6%-100% of the weeds in the blank control area;

[0126] Absolute value survey method:

[0127] Based on the survey data, the fresh weight efficacy of each treatment was calculated using the following formula.

[0128] Fresh weight control efficacy E = (fresh weight of control area - fresh weight of treatment area) × 100 / fresh weight of control area

[0129] Data statistics and analysis:

[0130] The calculation formula is as follows:

[0131] Fresh quality efficacy:

[0132] E = (Fresh weight of control area - Fresh weight of treatment area) / Fresh weight of control area × 100

[0133] Theoretical efficacy of mixed formulations:

[0134] E0 = (A + B) - A * B / 100

[0135] In the formula,

[0136] A represents the efficacy of herbicide I at a dosage of P;

[0137] B indicates the efficacy of herbicide II at a dosage of Q;

[0138] E0 represents the theoretical fresh weight control efficacy when the dosage of the mixture (Ⅰ+Ⅱ) is (P+Q);

[0139] E represents the actual freshness control efficacy of each treatment.

[0140] Evaluation criteria for the combined effects of mixed drugs:

[0141] E-E0 > 10% indicates a synergistic effect, E-E0 < -10% indicates an antagonistic effect, and E-E0 between ±10% indicates an additive effect.

[0142] Experimental results:

[0143] Indoor activity tests showed that compound (I) mixed with one of pendimethalin, fluthiamethoxam, or oxadiazon exhibited good indoor activity against common weeds such as barnyard grass, barnyard grass, crabgrass, carp, knotweed, duckweed, and flat-stemmed bulrush.

[0144] As shown in the table below, the mass ratios of compound (I) to pendimethalin of 3+30, 3+60, 6+30, 6+60, 6+120, 12+60, and 12+120 showed a synergistic effect on the control of *Echinochloa crus-galli*, *Barnyardgrass*, *Digitaria sanguinalis*, *Caragana korshinskii*, *Polygonum hydropiper*, *Monochoria vaginalis*, and *Scirpus spp.*. The mass ratios of compound (I) to fluthiamethoxam of 3+22.5, 3+45, 3:90, 6+22.5, 6+45, and 6:120 showed a synergistic effect on the control of *Echinochloa crus-galli*, *Barnyardgrass*, *Digitaria sanguinalis*, *Caragana korshinskii*, *Polygonum hydropiper*, *Monochoria vaginalis*, and *Scirpus spp.* showed a synergistic effect on the control of *Echinochloa crus-galli*. +90, 12+45, and 12+90 showed a synergistic effect on the control of Echinochloa crus-galli, Barnyardgrass, Crataegus pinnatifida, Cyperus rotundus, Polygonum hydropiper, Monochoria diversicolor, and Curcuma longa; the mass ratio of compound (Ⅰ) to oxadiazon ketone 3+6, 3+12, 6+6, 6+12, 6+24, 12+6, 12+12, and 12+24 showed a synergistic effect on the control of Echinochloa crus-galli, Barnyardgrass, Crataegus pinnatifida, Cyperus rotundus, Polygonum hydropiper, Monochoria diversicolor, and Curcuma longa.

[0145] Table 1. Combined effects of various mixed formulations with barnyardgrass

[0146]

[0147]

[0148] Table 2 Combined effects of various mixed combinations of crabgrass

[0149]

[0150]

[0151] Table 3. Combined effects of various mixed pairings of Qianjinzi

[0152]

[0153]

[0154] Table 4. Combined effects of various mixed pairs on carp intestines

[0155]

[0156]

[0157] Table 5. Combined effects of various mixed combinations with clove and Polygonum hydropiper

[0158]

[0159]

[0160] Table 6. Combined effects of various mixed combinations with duck tongue grass

[0161]

[0162]

[0163] Table 7. Combined effects of various mixed combinations on Curcuma longa.

[0164]

[0165]

[0166] Field efficacy trials

[0167] Field efficacy trials of herbicides in rice paddies

[0168] Experimental location: Nanchang County, Jiangxi Province. The land is paddy soil, flat in terrain, and of moderate fertility.

[0169] Crop: Rice (Huang Huazhan);

[0170] Test reagents and dosages:

[0171] Table 8. Drug Treatment and Dosage

[0172]

[0173] Experimental treatments: each treatment was replicated 3 times, with randomized block designs and plot sizes of 25 m². 2 .

[0174] Investigation methods: Observe whether there are symptoms of herbicide damage after crop emergence; conduct two efficacy surveys 20 days and 40 days after application, record the number of residual weeds, and calculate the control effect; weigh the fresh weight of weeds in the last survey and calculate the fresh weight control effect.

[0175] During the survey, 5 points were randomly selected within each neighborhood, with each point measuring 0.25m. 2 Yield was measured at harvest time, and the yield increase rate was calculated.

[0176] Methods for calculating efficacy and yield:

[0177] Prevention and control efficacy (%) = (CK - PT) / CK × 100

[0178] In the formula:

[0179] CK represents the number of weeds (or fresh weight) in the control area;

[0180] PT represents the number of weed plants (or fresh weight) in the treatment area.

[0181] Yield increase rate (%) = (Production in treatment area - Production in control area) / Production in control area × 100

[0182] Experimental Results and Analysis:

[0183] The results of continuous follow-up investigations after the experiment showed that no phytotoxicity occurred in any of the treatment areas, and that the rice was relatively safe under normal dosage.

[0184] Field efficacy surveys conducted 20 and 40 days after application revealed the control effects of different treatments on weeds in paddy fields, as shown in Table 9. As shown in Table 9, 20 days after application, the control efficiencies of 24% Compound (I)·Pentylmethyl Dispersible Oil Suspension (4+20), 42.5% Compound (I)·Flumethoxam EC (5+37.5), and 36% Compound (I)·Oxafen EC (18+18) on weeds in paddy fields were 86.32%, 84.25%, and 88.19%, respectively, demonstrating significant control effects.

[0185] Table 9. Weed control efficacy of different treatments 20 days after application in paddy fields (control efficacy per plant).

[0186]

[0187] As shown in Table 10, with the increase of time, 40 days after application, the control efficacy of 24% compound (I)·dimethalin dispersible oil suspension (4+20), 42.5% compound (I)·fluthiamethoxam EC (5+37.5), and 36% compound (I)·oxadiazon EC (18+18) against weeds in paddy fields were 91.22%, 90.43%, and 93.4%, respectively, showing good residual efficacy.

[0188] Table 10. Control efficacy of different treatments on weeds in paddy fields 40 days after application (fresh weight).

[0189]

[0190]

[0191] As shown in Table 11, all mixed treatments increased yield compared with the control group, with an increase rate of over 15.11%. Among them, the 36% compound (I) oxazinone emulsifiable concentrate (18+18) showed the most significant increase in yield, with an increase rate of 17.88%.

[0192] Table 11 Effects of different treatments on rice yield

[0193]

[0194] Field trial results showed that, in terms of rice safety, growth rate, and weed control efficacy, 4% compound (I)·dimethalin dispersible oil suspension (4+20), 42.5% compound (I)·fluthiamethoxam EC (5+37.5), and 36% compound (I)·oxadiazon EC (18+18) were all superior to the control single agent.

[0195] In summary, the herbicidal composition of the present invention is a combination of compound (I) and any one of pendimethalin, fluthiamethoxam, or oxadiazon. 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, with significant synergistic effect. It can delay the development of weed resistance, has low pesticide residue, good safety, and meets the safety requirements of pesticide formulations.

[0196] 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 by comprising: The composition comprises active ingredient A and active ingredient B, wherein the active ingredient A is a compound of formula (I): (I), the active ingredient B is selected from one or more of pendimethalin, fluorochloridone and oxaziclomefone; The mass ratio of the compound of formula (I) to pendimethalin is 3:60-12:60; The mass ratio of the compound of formula (I) to fluazifop-butyl is 3:90-12:45; The mass ratio of the compound of formula (I) to oxaziclomefone is 3:12-12:

6.

2. The herbicidal composition according to claim 1, wherein the mass ratio of the compound of formula (I) to pendimethalin is 3:30, 3:60, 6:30, 6:60, 6:120, 12:60, 12:120; the mass ratio of the compound of formula (I) to fluazifop-butyl is 3:22.5, 3:45, 3:90, 6:22.5, 6:45, 6:90, 12:45, 12:90; the mass ratio of the compound of formula (I) to oxaziclomefone is 3:6, 3:12, 6:6, 6:12, 6:24, 12:6, 12:12, 12:

24. The mass of the active ingredient A and the active ingredient B accounts for 10%-90% of the composition. The mass of the active ingredient A and the active ingredient B accounts for 20%-60% of the composition.

3. The herbicidal composition according to claim 1, characterized by The herbicidal composition further comprises an auxiliary ingredient in addition to the active ingredients, and the auxiliary ingredient is selected from one or more of wetting agents, dispersants, emulsifiers, thickening agents, disintegrants, antifreezing agents, antifoaming agents, solvents, preservatives, stabilizers, synergists, binders or fillers.

4. The herbicidal composition according to claim 1, characterized by The herbicidal composition is prepared into any one of emulsifiable concentrate, suspension concentrate, wettable powder, water dispersible granule or dispersible oil suspension.

5. The herbicidal composition according to claim 1, characterized by The unwanted plants are Euphorbia lathyris, Echinochloa crus-galli, Digitaria sanguinalis, Cyperus iria, Laggera alata, Monochoria vaginalis, Fimbristylis complanata.

6. The herbicidal composition according to claim 5, characterized by The growth site of the unwanted plants is paddy field.

7. The use of a herbicidal composition according to any one of claims 1 to 6 for controlling undesirable vegetation, characterized in that, The unwanted plants are Euphorbia lathyris, Echinochloa crus-galli, Digitaria sanguinalis, Cyperus iria, Laggera alata, Monochoria vaginalis, Fimbristylis complanata.

8. Use according to claim 7, characterized in that, The growth site of the unwanted plants is paddy field.

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