A herbicidal composition

Abstract

This invention discloses a herbicidal composition and its application. The composition comprises active ingredient A and active ingredient B, wherein active ingredient A is a compound of formula (I), and active ingredient B is selected from either flufenoxuron or pyrimethanil. The mass ratio of active ingredient A to active ingredient B in the composition is 1:20-10:1. This invention also relates to the use of the herbicidal composition in controlling the germination or growth of weeds in useful plants, particularly suitable for controlling the germination or growth of weeds in peanut fields.

Description

Technical Field

[0001] This invention belongs to the field of compound herbicide technology, specifically relating to a herbicide composition containing fluoxetine or pyrimethanil. Background Technology

[0002] Chemical weed control is one of the main methods of weed control in agriculture. In recent years, due to the large-scale use of some herbicides alone, many weeds have developed resistance. At the same time, the weed population is complex, with not only annual and perennial weeds mixed together, but also herbs, vines, and shrubs. Moreover, weed emergence is uneven, with seeds and young and old weeds occurring together. Therefore, when herbicides are used alone, they all exhibit certain defects and limitations.

[0003] Flufenoxam is an acetolactate synthase (ALS) inhibitor that inhibits cell division and plant growth by blocking the biosynthesis of valine, leucine, and isoleucine. It is primarily absorbed through roots and young shoots, but also exhibits herbicidal activity through foliage absorption. It is applied pre-emergence or early post-emergence to control grassy weeds, sedges, and broadleaf weeds in paddy fields. It is effective against barnyard grass, paspalum distichum, flat-stemmed sedge, and annual sedges; it also has good inhibitory effects on broadleaf weeds such as knotweed, arrowhead, water spinach, pondweed, and water sedge, as well as perennial sedges.

[0004] Azoxystrobin is a triazolopyrimidine sulfonamide herbicide that can be absorbed by the roots and leaves of plants. It inhibits the activity of acetolactate synthase in plants, hindering the synthesis of amino acids and proteins, leading to plant cessation of growth and death. Azoxystrobin has a broad spectrum of weed control and high activity, effectively controlling a variety of broadleaf weeds, including velvetleaf, amaranth, cocklebur, dayflower, red knotweed, and lambsquarters. Its weeding activity is not affected by soil moisture. Currently, it is widely used for broadleaf weed control in soybean fields.

[0005] Herbicides containing a single active ingredient have varying degrees of shortcomings in weed control. Continuous use can easily lead to weed resistance, resulting in a narrowed spectrum of weed control and environmental pollution. Rational herbicide formulation is an effective method to improve control efficacy, broaden the weed control spectrum, delay weed resistance development, reduce environmental pollution, lower usage costs, and reduce herbicide residues. The applicant unexpectedly discovered that mixing compound (I) with one or more of flumetsulam or pyrimethanil significantly enhances the control of various annual or perennial weeds, while also reducing dosage, lowering control costs, and ensuring crop safety. There are currently no reports on the mixing and application of compound (I) with one or more of flumetsulam or pyrimethanil. Summary of the Invention

[0006] 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.

[0007] Another object of the present invention is to provide a herbicidal composition formulation containing a compound of formula (I) and fluroxypyr or pyrimethanil.

[0008] Another object of the present invention is to provide the above-described herbicidal composition for the control of annual or perennial weeds in peanut fields.

[0009] 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):

[0010] Active ingredient B is selected from one or more of fluoxetine and pyrimethanil;

[0011] Furthermore, the mass ratio of active ingredient A to active ingredient B is 1:20-10:1;

[0012] Furthermore, the mass ratio of the compound of formula (I) to fluroxypyr is 1:10-2:1;

[0013] Furthermore, the mass ratio of the compound of formula (I) to fluroxypyr is 1:8-5:1, or any value within the above range;

[0014] Further, the mass ratio of the compound of formula (I) to fluroxypyr is 2.5:5, 2.5:15, 2.5:25, 5:5, 5:15, 5:25, 10:5, 10:15, 10:25;

[0015] Furthermore, the mass ratio of the compound of formula (I) to pyrimethanil is 1:18-2:1;

[0016] Furthermore, the mass ratio of the compound of formula (I) to pyrimethanil is 1:18-2:3, or any value within the above range;

[0017] Further, the mass ratio of the compound of formula (I) to pyrimethanil is 2.5:15, 2.5:30, 2.5:45, 5:15, 5:30, 5:45, 10:15, 10:30, or 10:45;

[0018] Further, the mass ratio of the compound of formula (I) to pyrimethanil is 2.5:15, 2.5:30, 5:15, 5:30, 5:45, 10:15, 10:30, or 10:45;

[0019] Furthermore, the active ingredient A and active ingredient B together constitute 5% to 90% of the composition;

[0020] Furthermore, the mass of active ingredient A and active ingredient B accounts for 10% to 60% of the composition;

[0021] Furthermore, the active ingredients A and B constitute 10%, 15%, 20%, 22%, 25%, 32%, 35%, 40%, 42%, 45%, 50%, 55%, and 60% of the composition, respectively.

[0022] 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.

[0023] 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

[0024] 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

[0025] 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

[0026] 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

[0027] 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

[0028] Furthermore, the antifreeze is selected from one or more of alcohols, alcohol ethers, chlorinated hydrocarbons, and inorganic salts; and / or

[0029] 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

[0030] 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

[0031] 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

[0032] 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

[0033] Furthermore, the synergist is selected from synergistic phosphorus, synergistic ether; and / or

[0034] 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.

[0035] Furthermore, the herbicidal composition can be prepared into an agriculturally permissible formulation.

[0036] Furthermore, the herbicide composition can be formulated into solid and / or liquid formulations.

[0037] The solid dosage form is any one of powder, granules, wettable powder, water-dispersible granules, soluble powder, and soluble granules.

[0038] The liquid formulation is any one of emulsifiable concentrate, suspension concentrate, aqueous solution, water emulsion, microemulsion, soluble concentrate, and dispersible oil suspension;

[0039] Furthermore, the dosage form is any one of emulsifiable concentrate, suspension concentrate, wettable powder, water-dispersible granules, and dispersible oil suspension;

[0040] 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;

[0041] 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;

[0042] 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;

[0043] 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.

[0044] 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;

[0045] The herbicidal composition described above is used for the control of unwanted plants;

[0046] Furthermore, the unwanted plants are annual weeds and / or perennial weeds;

[0047] 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.

[0048] 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;

[0049] Furthermore, unwanted plant growing locations include soybean fields, corn fields, peanut fields, wheat fields, rice paddies, vegetable fields, and orchards.

[0050] The beneficial effects of this invention are:

[0051] 1) It improved herbicidal activity and had a significant synergistic effect;

[0052] 2) It broadens the spectrum of weed control, enabling it to control multiple weeds and making up for the shortcomings of single agents in controlling major weeds;

[0053] 3) It is safe and efficient, effectively reducing farmers' pesticide application costs and improving economic benefits, and has high promotion value. Detailed Implementation

[0054] 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.

[0055] Formulation preparation examples

[0056] To better illustrate the present invention, the following description, in conjunction with embodiments, further explains the content of the present invention.

[0057] Preparation Example 1

[0058] 25% Formula (I) Compound·Fluoronesulfuron Suspension (5+20)

[0059] Formula composition: 5% compound of formula (I), 20% fluoxetine, 1% sodium lignosulfonate, 2% sodium alkyl polyoxyethylene ether sulfonate, 4% fatty alcohol polyoxyethylene ether phosphate, 3% block polyether, 0.8% magnesium aluminum silicate, 0.2% xanthan gum, 0.5% sodium benzoate, 5% ethylene glycol, 0.5% silicone defoamer, deionized water to make up the balance;

[0060] Preparation method: According to the formula ratio, water, dispersant and wetting agent are mixed evenly. Other functional additives are added under stirring. The mixture is then mixed evenly by high-speed shearing. Then the original drug is added and shearing is continued. The mixture is then ground in a horizontal sand mill. The particle size of the material is controlled to be below 90% of 5μm. Finally, the thickener is added and sheared evenly to obtain the suspension product.

[0061] Preparation Example 2

[0062] 28% Formula (I) Compound·Azoxystrobin Suspension Concentrate (6+22)

[0063] Formula composition: 6% compound of formula (I), 22% pyrimethanil, 3% dodecyl polyoxyethylene ether phosphate, 2% sodium alkyl polyoxyethylene ether sulfonate, 2% fatty alcohol polyoxyethylene ether, 1% sodium polycarboxylate, 1% magnesium aluminum silicate, 0.2% xanthan gum, 0.5% sorbitol, 0.1% sodium benzoate, 0.5% silicone oil, 5% ethylene glycol, deionized water to make up the balance;

[0064] Preparation method: Same as in preparation example 1.

[0065] Preparation Example 3

[0066] 40% Formula (I) Compound·Fluoronesulfuron wettable powder (16+24)

[0067] Formula composition: 16% compound of formula (I), 24% fluoxetine sulfonamide, 7.5% alkylnaphthalene formaldehyde condensate calcium sulfonate, 5% alkylphenol polyoxyethylene ether sodium sulfonate, 2% alkylnaphthalene sulfonate sodium, 2% sodium dodecyl sulfate, 3% organobentonite, kaolin to make up the balance;

[0068] 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.

[0069] Preparation Example 4

[0070] 64% Formula (I) Compound·Azoxystrobin Water Dispersible Granules (22+42)

[0071] Formula composition: 22% compound of formula (I), 42% pyrimethanil, 5% sodium alkyl naphthalene sulfonate, 3% sodium lignosulfonate, 2% sodium dodecyl sulfate, 2% sodium naphthalene sulfonate, 8% sodium polycarboxylate, 4% sodium carboxymethyl cellulose, 5% starch, and silica to make up the balance;

[0072] Preparation method: Same as in preparation example 5.

[0073] 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.

[0074] Preparation Example 5

[0075] 15% Formula (I) Compound·Fluoronesulfuron-methyl Dispersible Oil Suspension (4+11)

[0076] Formula composition: 4% of compound (I), 11% fluoxetine, 2% sodium diisooctyl succinate sulfonate, 2% polyoxyethylene ether, 15% castor oil polyoxyethylene ether, 3% calcium dodecylbenzene sulfonate, 1% organic bentonite, soybean oil to make up the balance.

[0077] 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.

[0078] Activity test

[0079] 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".

[0080] Experimental method: potted plant method

[0081] Experimental targets: foxtail grass, calla lily, amaranth retroflexus, cocklebur;

[0082] Test reagents: fluroxypyr technical, pyrimethanil technical, and compound (I) technical, all of which were provided by the Group's R&D Center.

[0083] Drug preparation:

[0084] Compound (I) was prepared into three concentration gradients: 2.5, 5, and 10 g ai / hm. 2 ;

[0085] Flufenoxam was formulated into three concentration gradients: 5, 15, and 25 g ai / hm. 2 ;

[0086] Acetazolamide was formulated into three concentration gradients: 15, 30, and 45 g ai / hm. 2 ;

[0087] Instruments and equipment: light incubator, spray tower, electronic balance, pots (9cm in diameter), beakers, pipettes;

[0088] Test materials: A measured amount of soil was filled to 4 / 5 of the pots. The soil was thoroughly moistened using bottom watering. Pretreated weed seeds were evenly sown on the soil surface, covered with 0.5-2.0 cm of soil depending on seed size, and then transplanted to a greenhouse for conventional cultivation. Water was added to the pots until saturated using bottom watering. After emergence, thinning was performed to ensure uniform weed density (120-150 plants per square meter).

[0089] 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.

[0090] Chemical treatment: Weeds were cultured in a light-controlled incubator until they reached the 1-3 leaf stage. 20 plants were then planted per pot and sprayed. For standardization spraying, foliar spraying was performed according to the experimental design, proceeding from low to high doses. Each treatment was replicated at least four times, with a control group (no chemical treatment) included.

[0091] After treatment, the surface of the test materials was allowed to air dry naturally before being transferred to a greenhouse for routine cultivation. Water was added to the pots and pans until saturation was achieved using bottom irrigation. A digital temperature and humidity recorder was used to record the dynamic temperature and humidity data within the greenhouse during the experiment.

[0092] 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.

[0093] The main symptoms are:

[0094] —Color changes (yellowing, whitening, etc.);

[0095] —Morphological changes (deformed or twisted new leaves, etc.);

[0096] —Growth changes (dehydration, wilting, dwarfing, clustering, etc.).

[0097] Absolute value survey method:

[0098] Based on the survey data, the fresh weight efficacy of each treatment was calculated using the following formula.

[0099] Fresh weight control efficacy E = (fresh weight of control area - fresh weight of treatment area) × 100 / fresh weight of control area

[0100] Data statistics and analysis:

[0101] Gowing method:

[0102] Theoretical control efficacy of the mixture E0 = Weed control efficacy of herbicide A at dosage P + Weed control efficacy of herbicide B at dosage Q - Weed control efficacy of herbicide A at dosage P × Weed control efficacy of herbicide B at dosage Q ÷ 100

[0103] Evaluation criteria for the combined effects of mixed drugs:

[0104] E-E0 > 10% indicates a synergistic effect, E-E0 < -10% indicates an antagonistic effect, and E-E0 between ±10% indicates an additive effect.

[0105] Experimental results:

[0106] Indoor activity tests showed that compound (I) mixed with one of fluoxetine or pyrimethanil exhibited good indoor activity against common weeds such as foxtail grass, calla lily, amaranth, and cocklebur.

[0107] Table 1 shows the combined effects of various mixtures on foxtail grass. It can be seen that the optimal application rate of compound (I) with fluoxetine is 2.5–10:5–25 g ai / hm. 2 E-E0 > 10% indicates a synergistic effect; compound (I) with pyrimethanil 2.5–10:15–45 g ai / hm 2 If E-E0 > 10% or E-E0 is between ±10%, it exhibits a synergistic or additive effect.

[0108] Table 1. Combined effects of various mixed combinations with foxtail grass

[0109]

[0110]

[0111] Table 2 shows the combined effects of various mixed formulations on calla lily. It can be seen that the optimal application rate of compound (I) with fluoxetine is 2.5–10:5–25 g ai / hm. 2 E-E0 > 10% indicates a synergistic effect; compound (I) with pyrimethanil 2.5–10:15–45 g ai / hm 2 If E-E0 > 10% or E-E0 is between ±10%, it exhibits a synergistic or additive effect.

[0112] Table 2 Combined effects of various mixed pairs on calla lily

[0113]

[0114]

[0115] Table 3 shows the combined effects of various mixed formulations on amaranth. It can be seen that the optimal application rate of compound (I) with flufenoxuron is 2.5–10:5–25 g ai / hm. 2 E-E0 > 10% indicates a synergistic effect; compound (I) with pyrimethanil 2.5–10:15–45 g ai / hm 2 E-E0 > 10%, indicating a synergistic effect.

[0116] Table 3. Combined effects of various mixed pairs on anti-branch amaranth.

[0117]

[0118]

[0119] Table 4 shows the combined effects of various mixed formulations on Xanthium sibiricum. It can be seen that the optimal application rate of compound (I) with fluroxypyr is 2.5–10:5–25 g ai / hm. 2 E-E0 > 10% indicates a synergistic effect; compound (I) with pyrimethanil 2.5–10:15–45 g ai / hm 2 E-E0 > 10%, indicating a synergistic effect.

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

[0121]

[0122] Field efficacy trials

[0123] Field efficacy trial for controlling weeds in peanut fields

[0124] The experiment was conducted in a spring-sown peanut field in Xinqiao Village, Huangwan Township, Fengyang County, Anhui Province. The experimental site had high fertility, flat terrain, and had historically been severely and evenly affected by broadleaf weeds.

[0125] Crop: Peanuts (Luhua No. 8) were planted in open fields on April 20th, with a planting density of 30cm×30cm; field operations were carried out according to standard procedures.

[0126] The main weeds that cause damage in the field include: amaranth, black nightshade, purslane, cocklebur, crabgrass, barnyard grass, and goosegrass.

[0127] Test reagents and dosages:

[0128] Table 5. Drug treatment and dosage

[0129]

[0130] Experimental treatments: each treatment was replicated 4 times, with randomized block designs and plot sizes of 20 m². 2 .

[0131] Application method: Apply the herbicide 20 days after peanut sowing, when peanuts have 3-5 leaves, broadleaf weeds have grown to 3-4 leaves and plant height is 2-3 cm, and grass weeds have 1-3 leaves.

[0132] The weather was sunny when spraying. A specialized Gongnong-16 backpack compressor sprayer was used for even spraying at a rate of 675 kg / hm². 2 Spray an equal amount of water in the blank control area, and keep the field moist during and after application.

[0133] Investigation Methods: After application, the responses of peanut seedlings and weeds to the pesticide were observed and recorded periodically—that is, the safety of the pesticide to peanut plants, the occurrence of phytotoxicity, and the symptoms of phytotoxicity. Twenty days after application, the weeding effect was assessed using a visual inspection method with a 9-level scale.

[0134] Grading method:

[0135] Level 1: All dead;

[0136] Level 2: Equivalent to 0-2.5% of the weeds in the blank control area;

[0137] Level 3: Equivalent to 2.6%–5% of the weeds in the blank control area;

[0138] Level 4: Equivalent to 5.1% to 10% of the weeds in the blank control area;

[0139] Level 5: Equivalent to 10.1%–15% of the weeds in the blank control area;

[0140] Level 6: Equivalent to 15.1%–25% of the weeds in the blank control area;

[0141] Level 7: Equivalent to 25.1%–35% of the weeds in the blank control area;

[0142] Level 8: Equivalent to 35.1%–67.5% of the weeds in the blank control area;

[0143] Level 9: Equivalent to 67.6% to 100% of the weeds in the blank control area.

[0144] The herbicidal effect was investigated 30 days after application using a sampling method with five diagonal sampling points per 1m in the treatment area. 2 The fresh weight of the aboveground weeds of each weed species was investigated, and the weed control efficacy was calculated by comparing it with the control area without weeding. Plant traits were examined and yield was measured by region at peanut harvest. The average of four replicates was used for calculation.

[0145] The efficacy of the drug is calculated using the following formula:

[0146] Prevention and control efficacy (%) = (CK - PT) / CK × 100

[0147] In the formula:

[0148] CK represents the fresh weight of the control area;

[0149] PT represents the fresh weight of the processing area.

[0150] Experimental results:

[0151] Field efficacy surveys conducted 20 and 30 days after application revealed the control effects of different treatments on weeds in peanut fields, as shown in Table 6. As indicated in Table 6, using visual inspection, 20 days after application, both 25% Compound (I)·fluoxetine suspension (5+20) and 40% Compound (I)·fluoxetine wettable powder (16+24) showed a control efficacy of level 9 on weeds in peanut fields. At 30 days after application, the control efficacy was above 90%, demonstrating excellent control effects.

[0152] Table 6. Control effects of different post-drug treatments on weeds in peanut fields.

[0153]

[0154] Table 7. Control effects of different post-drug treatments on weeds in peanut fields.

[0155]

[0156] In summary, the herbicidal composition of the present invention is a combination of compound (I) and either flumetsulam or pyrimethanil. 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.

[0157] 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 fluoxetine and pyrimethanil. The mass ratio of the compound of formula (I) to fluroxypyr is 1:10-2:1; The mass ratio of the compound of formula (I) to pyrimethanil is 1:18-2:

3.

2. The herbicidal composition according to claim 1, characterized in that, The mass ratio of the compound of formula (I) to fluroxypyr is 2.5:5, 2.5:15, 2.5:25, 5:5, 5:15, 5:25, 10:5, 10:15, 10:25; The mass ratio of the compound of formula (I) to pyrimethanil is 2.5:15, 2.5:30, 5:15, 5:30, 5:45, 10:15, 10:30, and 10:

45.

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 in controlling the germination or growth of weeds in useful plants, characterized in that, The weeds mentioned are foxtail grass, calla lily, amaranth, and cocklebur.

8. The use according to claim 7, characterized in that, The useful plant mentioned is corn.

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