Weeding composition and application thereof

Abstract

The invention discloses a weeding composition which comprises an active component A and an active component B. The active component A is a compound shown in the formula (I), and the active component B is selected from one or more of pendimethalin, flufenacet and oxaziclomefone. The mass ratio of the active component A to the active component B of the composition is (1: 50)-(50: 1). The composition is reasonable in component, the activity and the weeding effect of the composition are not simple superposition of all the components, and compared with a single preparation, the composition has the characteristics of remarkable weeding effect, low dosage, wide weed control spectrum and good safety to crops.

Description

Technical Field

[0001] The present invention belongs to the technical field of compound pesticide weeding, and particularly relates to a weeding composition. Background Art

[0002] Rice is one of the most important food crops in China. At the same time, due to the large population base in China, China ranks first in the world in terms of rice consumption. At present, the weeds commonly occurring in paddy fields are mainly weeds of Gramineae, Pontederiaceae, Alismataceae, Cyperaceae, Compositae, etc. Weeds have strong adaptability to adverse environments and strong reproduction and regeneration abilities. They can emerge at different times and grow vigorously, inhibiting the growth of main cultivated crops. They not only affect the quality and yield of rice, but also have an impact on the ecological environment by spreading diseases, insects and weeds, and ultimately threaten the safety of humans themselves.

[0003] Pendimethalin mainly inhibits the cell division of meristems, does not affect the germination of weed seeds, but acts after the young buds, stems and roots absorb the drug during the germination process of weed seeds. The absorption parts of dicotyledonous plants are the hypocotyls, and those of monocotyledonous plants are the young buds. The symptoms of damage are that the growth of young buds and secondary roots is inhibited.

[0004] Flufenacet belongs to aryloxyacetamide compounds and has the advantages of high herbicidal activity, low toxicity, broad spectrum, wide range of applicable crops and high safety. It is mainly used for crops such as corn, rice, tomato, potato and peanut, and can effectively control many annual gramineous weeds, sedges and some small-seeded broad-leaved weeds.

[0005] Oxaziclomefone was developed by Mitsubishi Chemical Corporation of Japan. It is a new type of oxazinone herbicide with systemic conduction. It is mainly used to control important broad-leaved weeds, Cyperaceae weeds and Echinochloa weeds, etc. It is absorbed by the roots and the base of the stems and leaves of weeds to inhibit the growth of target plant cells, resulting in chlorosis of the stems and leaves, stopping growth, and finally withering.

[0006] Herbicide varieties containing a single active ingredient have different degrees of defects in weed control. After continuous use, weeds are prone to develop resistance problems, such as reduced activity against weeds and narrowed herbicidal spectrum. The compound use of herbicide products with different action mechanisms can improve the weed control effect, expand the herbicidal spectrum, delay weed resistance, reduce the cost of pesticide use, and is a reasonable and effective method to reduce herbicide residues. The applicant unexpectedly found that mixing the compound of formula (I) with any one or more of pendimethalin, flufenacet and oxaziclomefone has obvious synergistic weeding effects on various annual or perennial weeds, can also reduce the dosage of drugs, lower the control cost, and has the advantage of being safe for crops. And after retrieval, there is no report on the mixed control of weeds containing the compound of formula (I) and any one or more of pendimethalin, flufenacet and oxaziclomefone. Summary of the Invention

[0007] The object of the present invention is to provide a weeding composition with reasonable components, low drug cost, obvious synergistic effect, good weeding effect, broad herbicidal spectrum and safe to crops.

[0008] Another object of the present invention is to provide a preparation dosage form of a weeding composition containing a compound of formula (I) and pendimethalin, flufenacet or oxadiazon.

[0009] Another object of the present invention is to provide the application of the above weeding composition in controlling annual or perennial weeds in paddy fields.

[0010] To solve the above problems, the technical solution provided by the present invention is as follows: a weeding composition, which comprises 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, flufenacet and oxadiazon;

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

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

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

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

[0016] Furthermore, 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;

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

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

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

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

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

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

[0024] Furthermore, 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;

[0025] Furthermore, the sum of the masses of active ingredient A and active ingredient B accounts for 10% - 90% of the composition;

[0026] Even further, the sum of the masses of active ingredient A and active ingredient B accounts for 20% - 60% of the composition;

[0027] Furthermore, the herbicidal composition further comprises agriculturally acceptable auxiliary ingredients in addition to the active ingredients, and the auxiliary ingredients are selected from one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreezing agents, defoaming agents, solvents, preservatives, stabilizers, synergists or carriers;

[0028] Furthermore, the wetting agent is selected from one or more of alkyl benzene sulfonates, alkyl naphthalene sulfonates, lignin sulfonates, sodium dodecyl sulfate, sodium dioctyl sulfosuccinate, α-olefin sulfonates, alkylphenol polyoxyethylene ethers, castor oil polyoxyethylene ethers, alkylphenol ethoxylates, fatty alcohol ethoxylates, sodium fatty alcohol polyoxyethylene ether sulfate, silkworm excrement, sophora flavescens powder, sapindus powder, SOPA, detergent, emulsifier 2000 series and wetting penetrant F; and / or

[0029] Further, the dispersant is selected from one or more of lignosulfonates, alkylnaphthalenesulfonate formaldehyde condensates, naphthalenesulfonates, triphenylvinylphenol ethoxylate phosphates, fatty alcohol ethoxylates, alkylphenol polyoxyethylene ethers, alkylphenol polyoxyethylene ether methyl ether condensate sulfates, fatty amine polyoxyethylene ethers, glycerol fatty acid ester polyoxyethylene ethers, polycarboxylates, polyacrylates, phosphates, EO-PO block copolymers, and EO-PO graft copolymers; and / or

[0030] Further, the emulsifier is selected from one or more of calcium dodecylbenzenesulfonate, alkylphenol formaldehyde resin polyoxyethylene ether, phenethylphenol polyoxyethylene polyoxypropylene ether, fatty alcohol ethylene oxide-propylene oxide copolymer, styrylphenol polyoxyethylene ether, castor oil polyoxyethylene ether, and alkylphenol ether phosphate; and / or

[0031] Further, the thickener is selected from one or more of xanthan gum, organic bentonite, gum arabic, sodium alginate, magnesium aluminum silicate, carboxymethyl cellulose, and silica white; 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] Further, the antifreeze is selected from one or more of alcohols, alcohol ethers, chlorinated hydrocarbons, and inorganic salts; and / or

[0034] Further, the defoamer is selected from one or more of C 10 -C 20 saturated fatty acid compounds, silicone oils, silicone compounds, and C8-C10 fatty alcohols; and / or

[0035] Further, the solvent is selected from one or more of benzene, toluene, xylene, durene, methanol, ethanol, isopropanol, n-butanol, dimethyl sulfoxide, dimethylformamide, cyclohexanone, alkylene carbonate, diesel oil, solvent naphtha, 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 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 white, talc powder, montmorillonite, and starch; and / or

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

[0039] Furthermore, the carrier is selected from one or more of 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 a preparation dosage form permitted in agriculture;

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

[0042] Furthermore, the solid preparation is any one of powder, granule, wettable powder, water dispersible granule, soluble powder and soluble granule;

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

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

[0045] Furthermore, the composition is an emulsifiable concentrate, and the components and their contents contained in the emulsifiable concentrate are preferably: 0.1 - 100 parts of active ingredient A, 0.1 - 100 parts of active ingredient B, 0.1 - 20 parts of emulsifier, and the solvent makes up the balance;

[0046] Furthermore, the composition is a suspension concentrate, and the components and their contents contained in the suspension concentrate are preferably: 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 makes up the balance;

[0047] Furthermore, the composition is a wettable powder, and the components and their contents contained in 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 makes up the balance;

[0048] Furthermore, the composition is a water dispersible granule, and the components and their contents contained in the water dispersible granule are preferably: 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 makes up the balance;

[0049] Further, the composition is a dispersible oil suspension, and the components and contents contained in the dispersible oil suspension are preferably: 0.1 to 100 parts of active ingredient A, 0.1 to 100 parts of active ingredient B, 1 to 15 parts of dispersant, 0.5 to 20 parts of emulsifier, 1 to 10 parts of wetting agent, 1 to 10 parts of thickener, 0 to 10 parts of antifreeze, and the balance is made up with a dispersion medium;

[0050] Use of a herbicidal composition as described above for controlling unwanted plants;

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

[0052] Further, the unwanted plants are annual weeds and / or perennial weeds of the Gramineae, Rubiaceae, Euphorbiaceae, Cyperaceae, Compositae, Polygonaceae, Scrophulariaceae, Solanaceae, Amaranthaceae, Caryophyllaceae, Cruciferae, Lamiaceae, Leguminosae, Convolvulaceae, Boraginaceae, Commelinaceae, Malvaceae, Chenopodiaceae families;

[0053] Annual or perennial weeds such as: wild oats Avena fatua, Alopecurus aequalis, Poa annua, Selerochloa kengiana, Beckmannia syzigachne, Polypogon fugax, Bromus japonicas, Galium aparine, Euphorbia helioscopia, Veronica persica, Malachium aquaticum, Silene conoidea, Vaccaria segetalia, Descurainia Sophia, Thlaspi arvense, Capsella bursa-pastoris, Lamium amplexicaule, Vicia sativa, Calystegia hederacea, 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, Abutilon theophrasti, Chenopodium album, Rumexcrispus, Cassia tora, Stellaria media, Cerastium arvense, Veronica didyma, Erigeron annuus, Vicia sativa, Arabidopsis thaliana, Cyperus iria, Cyperus difformis, Polygonum hydropiper, Leptochloa chinensis, Cynodon dactylon, 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, the growth sites of unwanted plants are paddy fields, corn fields, peanut fields, wheat fields, soybean fields, vegetable fields, and fruit orchards;

[0055] Furthermore, the growth site of unwanted plants is a paddy field.

[0056] Advantages of the present invention:

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

[0058] The herbicidal composition of the present invention can control various weeds in the field, expand the weed control spectrum, and make up for the disadvantage of poor control effect of a single agent on a single weed;

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

[0060] To make the objectives, technical solutions and advantages of the present invention more concise and clear, the present invention is described by the following specific embodiments. However, the present invention is by no means limited to these embodiments. The embodiments described below are only the preferred embodiments of the present invention and can be used to describe the present invention, but should not be construed as a limitation on the scope of the present invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0061] Examples of Preparation of Formulations

[0062] To better illustrate the present invention, the content of the present invention will be further described below in conjunction with embodiments.

[0063] Preparation Example 1

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

[0065] Formulation composition: 4% Compound of Formula (I), 20% Pendimethalin, 10% Dimethyl Sulfoxide, 10% Styrylphenol Polyoxyethylene Ether, 0.5% Calcium Dodecylbenzenesulfonate, 14% Propylene Carbonate, and the balance made up with xylene;

[0066] Preparation method: According to the formula ratio, the measured active ingredients, solvents, and additives are added to a mixing kettle and stirred to dissolve them. Then, an emulsifier is added, and the balance is made up with the remaining solvent. After stirring evenly in the stirring kettle and filtering, the EC required by the present invention is obtained.

[0067] Preparation Example 2

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

[0069] Formulation composition: 1% Compound of Formula (I), 30% Flufenacet, 15% Dimethyl Sulfoxide, 14% Styrylphenol Polyoxyethylene Ether, 2% Calcium Dodecylbenzenesulfonate, 20% Propylene Carbonate, and the balance made up with xylene;

[0070] Preparation method: The same as Preparation Example 1.

[0071] Preparation Example 3

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

[0073] Formulation composition: 3% Compound of Formula (I), 24% Oxaziclomefone, 11% Dimethyl Sulfoxide, 10.5% Styrylphenol Polyoxyethylene Ether, 0.5% Calcium Dodecylbenzenesulfonate, 14% Propylene Carbonate, and the balance made up with xylene;

[0074] Preparation method: The same as Preparation Example 1.

[0075] Preparation Example 4

[0076] 42% Compound of Formula (I) · Pendimethalin Suspension Concentrate (2 + 40)

[0077] Formulation composition: 2% Compound of Formula (I), 40% Flufenacet, 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;

[0078] Preparation method: According to the formulation ratio, put the active ingredient, surfactant and other functional additives into the reaction kettle in turn, add water and mix evenly, carry out high-speed shearing, wet grinding, and finally homogenize and filter to obtain the suspension concentrate product.

[0079] Preparation Example 5

[0080] 42.5% Compound of (I) · Flufenacet Suspension Concentrate (5:37.5)

[0081] Formulation of the preparation: 5% Compound of Formula (I), 37.5% Flufenacet, 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: The same as Preparation Example 4.

[0083] Preparation Example 6

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

[0085] Formulation 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: The same as Preparation Example 4.

[0087] Preparation Example 7

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

[0089] Formulation of the preparation: 6% Compound of Formula (I), 30% Pendimethalin, 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, Soybean oil to make up the balance;

[0090] Preparation method: According to the formula ratio, the active ingredient, surfactant and other functional auxiliaries are sequentially placed in a reaction kettle, mixed evenly, and subjected to high-speed shearing. Using zirconium beads, wet grinding is carried out with a sand mill until D 90 (The particle size of 90% of the particles) < 5 μm, and a dispersible oil suspension product can be prepared.

[0091] Preparation Example 8

[0092] 48% Compound of formula (I) · Pendimethalin Dispersible Oil Suspension (3 + 45)

[0093] Formulation composition: 3% Compound of formula (I), 45% Pendimethalin, 4% Sodium dodecylbenzenesulfonate, 3% Polycarboxylate, 15% Polyol fatty acid ester and its ethylene oxide adduct, 5% Castor oil polyoxyethylene ether, 1% Organic bentonite, 1% Fumed silica, Corn oil to make up the balance;

[0094] Preparation method: The same as Preparation Example 7.

[0095] Preparation Example 9

[0096] 36% Compound of formula (I) · Oxaziclomefone Dispersible Oil Suspension (18 + 18)

[0097] Formulation composition: 18% Compound of formula (I), 18% Oxaziclomefone, 3% Sodium dodecylbenzenesulfonate, 2% Polycarboxylate, 15% Polyol fatty acid ester and its ethylene oxide adduct, 5% Castor oil polyoxyethylene ether, 1% Organic bentonite, 1% Fumed silica, Corn oil to make up the balance;

[0098] Preparation method: The same as Preparation Example 7.

[0099] Activity test

[0100] Test basis: Test basis: NY / T 1155.4 - 2006 "Pesticide Bioassay Guidelines for Indoor Herbicides Part 4: Herbicidal Activity Determination Test - Stem and Leaf Spraying Method"; NY / T 1155.7 - 2006 "Pesticide Bioassay Guidelines for Indoor Herbicides Part 7: Determination of the Combined Action of Mixtures".

[0101] Test method: Pot method

[0102] Test targets: Leptochloa chinensis, Echinochloa crusgalli, Digitaria sanguinalis, Eclipta prostrata, Ludwigia prostrata, Monochoria vaginalis, Scirpus planiculmis;

[0103] Test agents: 95% Pendimethalin technical, 95% Pendimethalin technical, 95% Oxaziclomefone technical, 95% Compound of formula (I) technical, and the above technicals are all provided by the Group R & D Center.

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

[0105] Test materials: The test soil was quantitatively filled to 4 / 5 of the pot. The bottom infiltration irrigation method was used to make the soil completely wet. The pre-treated test weed seeds were evenly sown on the soil surface, covered with soil 0.5 cm - 2.0 cm according to the seed size, and then transferred to the greenhouse for conventional cultivation after sowing. Dry field weeds were replenished with water by the bottom infiltration irrigation method of the pot, and paddy field weeds were replenished with water to saturation by the top irrigation method of the pot. After the weeds emerged, thinning and final plant stand were carried out to ensure the same weed density.

[0106] Drug preparation: Water-soluble drugs were directly dissolved and diluted with water. Other drugs were dissolved with a suitable solvent (such as dimethylformamide or dimethyl sulfoxide), and diluted with a 0.1% aqueous solution of Tween 80.

[0107] Drug treatment: Calibrated spraying was carried out, and foliar spraying treatment was carried out in the order from low dose to high dose according to the test design. Each treatment had no less than 4 replicates, and a treatment without drugs was set as a blank control. Cultivated in a solar greenhouse, when the weeds grew to the 1 - 3 leaf stage, 20 plants were fixed in each pot for gramineous and cyperaceous weeds, and 8 plants were fixed in each pot for broad-leaved weeds for spraying treatment.

[0108] After treatment, wait for the liquid medicine on the surface of the test materials to dry naturally, and then transfer it to the greenhouse for conventional cultivation. Dry field weeds were replenished with water by the bottom infiltration irrigation method of the pot, and paddy field weeds were replenished with water to saturation by the top irrigation method of the pot.

[0109] Investigation: Regularly observe and record the growth status of the test weeds after treatment. 14 days after treatment, the herbicidal activity and the number of surviving weeds were investigated by visual inspection and absolute value (counting) investigation methods, and the damage symptoms were described at the same time.

[0110] The main symptoms are:

[0111] - Color change (chlorosis, albinism, etc.);

[0112] - Morphological change (deformed new leaves, twisted, etc.);

[0113] - Growth change (dehydration, withering, dwarfing, clustering, etc.).

[0114] Visual inspection method:

[0115] According to the damage symptoms and severity of the test target weeds, evaluate the herbicidal activity of the drug.

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

[0117] Grade 1: All dead;

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

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

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

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

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

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

[0124] Level 8: Equivalent to 35.1%-67.5% of 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] According to the survey data, the fresh weight control effect of each treatment was calculated as follows:

[0128] Fresh weight protection effect 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 prevention effect:

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

[0133] Theoretical efficacy of mixing:

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

[0135] In the formula,

[0136] A represents the control effect of herbicide I when the dosage is P;

[0137] B represents the control effect of herbicide II when the dosage is Q;

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

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

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

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

[0142] Test results:

[0143] Through indoor bioactivity tests, it was found that the compound of formula (I) mixed with one of pendimethalin, flufenacet, and oxaziclomefone has good indoor bioactivity against common weeds such as Leptochloa chinensis, Echinochloa crusgalli, Digitaria sanguinalis, Eclipta prostrata, Ludwigia prostrata, Monochoria vaginalis, and Scirpus planiculmis.

[0144] As shown in the following table, when 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 control effects on Leptochloa chinensis, Echinochloa crusgalli, Digitaria sanguinalis, Eclipta prostrata, Ludwigia prostrata, Monochoria vaginalis, and Scirpus planiculmis show a synergistic effect; when the mass ratio of the compound of formula (I) to flufenacet is 3 + 22.5, 3 + 45, 3:90, 6 + 22.5, 6 + 45, 6 + 90, 12 + 45, 12 + 90, the control effects on Leptochloa chinensis, Echinochloa crusgalli, Digitaria sanguinalis, Eclipta prostrata, Ludwigia prostrata, Monochoria vaginalis, and Scirpus planiculmis show a synergistic effect; when 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 control effects on Leptochloa chinensis, Echinochloa crusgalli, Digitaria sanguinalis, Eclipta prostrata, Ludwigia prostrata, Monochoria vaginalis, and Scirpus planiculmis show a synergistic effect.

[0145] Table 1 Joint action of each mixture on Echinochloa crusgalli

[0146]

[0147]

[0148] Table 2 Joint action of each mixture on Digitaria sanguinalis

[0149]

[0150]

[0151] Table 3 Joint action of each mixture on Leptochloa chinensis

[0152]

[0153]

[0154] Table 4 Joint action of each mixture on Eclipta prostrata

[0155]

[0156]

[0157] Table 5 Joint action of each mixture on Ludwigia prostrata

[0158]

[0159]

[0160] Table 6 Joint Action of Each Mixture on Monochoria vaginalis

[0161]

[0162]

[0163] Table 7 Joint Action of Each Mixture on Scirpus planiculmis

[0164]

[0165]

[0166] Field Efficacy Test

[0167] Field Efficacy Test of Herbicides in Paddy Fields

[0168] Test Site: Nanchang County, Jiangxi Province. The field is paddy soil with flat terrain and medium fertility.

[0169] Crop: Rice (Huanghuazhan);

[0170] Test Agents and Dosages:[[]]

[0171] Table 8 Agent Treatments and Dosages

[0172]

[0173] Test Treatments: Each treatment has 3 replicates, randomly arranged in blocks, and the plot area is 25m 2 .

[0174] Investigation Method: Observe the presence of phytotoxicity symptoms after crop emergence; conduct 2 efficacy investigations 20d and 40d after application, record the remaining weed numbers, calculate the control effect; weigh the fresh weight of weeds at the last time and calculate the fresh weight control effect.[[]]

[0175] When investigating, randomly select 5 points in each plot, and each point is 0.25m 2 . Measure the yield at harvest and calculate the yield increase rate.[[]]

[0176] Calculation Methods for Control Effect and Yield:[[]]

[0177] Control Effect (%) = (CK - PT) / CK × 100

[0178] In the formula:

[0179] CK is the number of weed plants (or fresh weight) in the control plot;

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

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

[0182] Test results and analysis:

[0183] The results of continuous follow-up surveys after the test showed that no phytotoxicity occurred in each treatment area, and it is relatively safe for rice under normal use doses.

[0184] Field control efficacy surveys were conducted 20 days and 40 days after application. The control effects of different treatments on weeds in paddy fields are shown in the following table: Among them, as shown in Table 9, 24% Compound (I) · Pendimethalin Dispersible Oil Suspension Concentrate (4 + 20), 42.5% Compound (I) · Flufenacet EC (5 + 37.5), and 36% Compound (I) · Oxadiazon EC (18 + 18) had control efficacies of 86.32%, 84.25%, and 88.19% respectively on weeds in paddy fields 20 days after application, and the control effects were significant.

[0185] Table 9 Control effects of different treatments on weeds in paddy fields 20 days after application (plant control efficacy)

[0186]

[0187] As shown in Table 10, with the increase of time, 24% Compound (I) · Pendimethalin Dispersible Oil Suspension Concentrate (4 + 20), 42.5% Compound (I) · Flufenacet EC (5 + 37.5), and 36% Compound (I) · Oxadiazon EC (18 + 18) had control efficacies of 91.22%, 90.43%, and 93.4% respectively on weeds in paddy fields 40 days after application, showing good persistence.

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

[0189]

[0190]

[0191] As shown in Table 11, all the mixed treatment groups had yield-increasing effects compared with the control group, and the yield increase rates all reached more than 15.11%. Among them, 36% Compound (I) · Oxadiazon EC (18 + 18) had the most significant yield increase, with a yield increase rate of 17.88%.

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

[0193]

[0194] The results of field trials showed that, in terms of the safety, growth rate of rice and weed control efficacy, the 4% compound (I) · pendimethalin dispersible oil suspension (4 + 20), 42.5% compound (I) · flufenacet emulsifiable concentrate (5 + 37.5), and 36% compound (I) · oxaziclomefone emulsifiable concentrate (18 + 18) were all superior to the control single agents.

[0195] In summary, the herbicidal composition of the present invention is a combination of compound (I) with any one of pendimethalin, flufenacet, and oxaziclomefone. Its activity and herbicidal effect are not a simple superposition of the activities of each component. Compared with the existing single preparations, it has a significant control effect on plots with mixed growth of various gramineous weeds and broad-leaved weeds, with a significant synergistic effect, can delay weed resistance, has a low pesticide residue, good safety, and meets the safety requirements of pesticide preparations.

[0196] Although the present invention has been described in detail above with general descriptions and specific embodiments, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection of the present invention.

Claims

1. A herbicidal composition, characterized in that, The composition contains active ingredient A and active ingredient B, wherein active ingredient A is a compound of formula (I): The active ingredient B is selected from one or more of pendimethalin, flufenacet, and oxaziclomefone.

2. The herbicidal composition according to claim 1, characterized in that, The weight ratio of active ingredient A to active ingredient B in the herbicidal composition is 1:50 - 50:

1.

3. The herbicidal composition according to claim 1, wherein The mass ratio of the compound of formula (I) to pendimethalin is 1:50 - 20:1; The mass ratio of the compound of formula (I) to flufenacet is 1:40 - 20:1; The mass ratio of the compound of formula (I) to oxaziclomefone is 1:20 - 20:1; 4. The herbicidal composition according to claim 1, wherein The mass ratio of the compound of formula (I) to pendimethalin is 1:40 - 5:1; The mass ratio of the compound of formula (I) to flufenacet is 1:30 - 10:1; The mass ratio of the compound of formula (I) to oxaziclomefone is 1:10 - 10:1; 5. The herbicidal composition according to claim 1, wherein The sum of the masses of active ingredient A and active ingredient B accounts for 10% - 90% of the composition, preferably 20% - 60%.

6. The herbicidal composition according to claim 1, wherein: The herbicidal composition further includes agriculturally acceptable auxiliary ingredients in addition to the active ingredients. The auxiliary agents are selected from one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreezing agents, defoaming agents, solvents, preservatives, stabilizers, synergists, binders, dispersion media, fillers or carriers.

7. The weeding composition according to claim 6, wherein The herbicide composition can be formulated into solid preparations and / or liquid preparations, The solid preparation is any one of powder, granule, wettable powder, water-dispersible granule, soluble powder, soluble granule; The liquid preparation is any one of emulsifiable concentrate, suspension concentrate, aqueous solution, emulsion in water, microemulsion, soluble solution, dispersible oil suspension; Preferably, the dosage form is any one of emulsifiable concentrate, suspension concentrate, wettable powder, water-dispersible granule, dispersible oil suspension.

8. Use of the herbicidal composition according to any one of claims 1 - 7 for controlling unwanted plants.

9. The use according to claim 8, characterized in that, The unwanted plants are annual weeds and / or perennial weeds; Preferably, the unwanted plants are annual weeds and / or perennial gramineous, rubiaceae, euphorbiaceae, cyperaceae, compositae, polygonaceae, scrophulariaceae, solanaceae, amaranthaceae, caryophyllaceae, cruciferae, labiatae, leguminosae, convolvulaceae, boraginaceae, commelinaceae, malvaceae, chenopodiaceae weeds.

10. The use according to claim 8, characterized in that, The growth sites of the unwanted plants are paddy fields, corn fields, peanut fields, wheat fields, soybean fields, vegetable fields, fruit orchards.

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