Weeding composition

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 pendimethalin. The mass ratio of the active component A to the active component B of the composition is (1: 28)-(10: 1). The invention further relates to application of the weeding composition in controlling germination or growth of weeds in useful plants, and the weeding composition is particularly suitable for controlling germination or growth of weeds in paddy fields.

Description

[0001] This invention application is a divisional application of application number CN202410772986.8, application date 20240617, and invention title "A Herbicide Composition". Technical Field

[0002] This invention belongs to the field of pesticide compound weed control technology, specifically relating to a weed control composition. Background Technology

[0003] Rice is one of my country's major crops. For a long time, barnyard grass, pondweed, and three-angled grass have been the three major pests in rice fields. In addition, in some areas, due to the long-term and continuous use of herbicides such as pyrimisulfuron and bensulfuron-methyl, the damage caused by the previously serious pests such as pondweed and sedge has gradually decreased. However, the damage caused by perennial wild arrowhead, water plantain, and annual plants such as water caltrop, duckweed, wild water chestnut, and wild purslane has increased.

[0004] Compound (I) is a novel isoxazole herbicide developed by Japan Combinatorial Chemicals Co., Ltd. It is mainly used in rice fields before and after budding and has a good control effect on grass and broadleaf weeds, especially barnyard grass, as well as weeds of the genera *Phyllostachys* and *Hemiberlesia lataniae*.

[0005] Pendimethalin is an organic compound, belonging to the dinitroaniline class of herbicides. It primarily inhibits meristematic cell division, without affecting weed seed germination. Its effect comes from the absorption of the herbicide by the young shoots, stems, and roots during seed germination. It is suitable for corn, soybeans, cotton, vegetables, and orchards, controlling annual grasses and broadleaf weeds. Oxacillin is a novel oxadiazon parent herbicide used in rice and lawns. Oxacillin is highly safe for transplanted rice and is highly effective against annual rice weeds, especially barnyard grass, with a long residual effect.

[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 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 pendimethalin or 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 prior reports of mixing compound (I) with pendimethalin or oxadiazon for the control of annual or perennial weeds. 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 pendimethalin or oxadiazon.

[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] The active ingredient B is selected from one or more of pendimethalin and oxadiazon;

[0012] Furthermore, the weight ratio of active ingredient A to active ingredient B in the herbicidal composition is 1:28 to 10:1;

[0013] Furthermore, the mass ratio of the compound of formula (I) to oxadiazon is 1:18 to 10:1;

[0014] Furthermore, the mass ratio of the compound of formula (I) to oxadiazon is 1:5-3:1, such as 1:5, 1:3, 2:5, 3:5, 2:3, 1:1, 2:1, 3:1 or any value between the above values;

[0015] Furthermore, the mass ratio of the compound of formula (I) to dimethylpentylamine is 1:28-5:1;

[0016] Furthermore, the mass ratio of the compound of formula (I) to dimethylpentylamine is 1:28-3:4, such as 1:28, 1:16, 3:28, 1:8, 3:16, 1:4, 1:2, 3:4 or any value between the above values;

[0017] Furthermore, the mass ratio of the compound of formula (I) to dimethylpentylamine is 1:16-3:4;

[0018] Furthermore, the active ingredient A and active ingredient B together constitute 5% to 90% of the composition;

[0019] Furthermore, the mass of active ingredient A and active ingredient B accounts for 10% to 60% of the composition;

[0020] 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.

[0021] 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

[0022] 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

[0023] 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

[0024] 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

[0025] 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

[0026] Furthermore, the antifreeze is selected from one or more of alcohols, alcohol ethers, chlorinated hydrocarbons, and inorganic salts; and / or

[0027] Furthermore, the defoamer is selected from C 10 -C 20 Saturated fatty acid compounds, silicone oil, silicone compounds, C8-C 10 One or more of the fatty alcohols; and / or

[0028] 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

[0029] 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

[0030] 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

[0031] Furthermore, the synergist is selected from synergistic phosphorus, synergistic ether; and / or

[0032] 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.

[0033] Furthermore, the herbicidal composition can be prepared into an agriculturally permissible formulation.

[0034] Furthermore, the herbicide composition can be formulated into solid and / or liquid formulations.

[0035] The solid dosage form is any one of powder, granules, wettable powder, water-dispersible granules, soluble powder, and soluble granules.

[0036] The liquid formulation is any one of emulsifiable concentrate, suspension concentrate, aqueous solution, water emulsion, microemulsion, soluble concentrate, and dispersible oil suspension;

[0037] Furthermore, the dosage form is any one of emulsifiable concentrate, suspension concentrate, wettable powder, water-dispersible granules, and dispersible oil suspension;

[0038] 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 of solvent;

[0039] Furthermore, the composition is a suspending agent, and the components and contents of the suspending agent 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 deionized water to make up the balance;

[0040] 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;

[0041] 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.

[0042] 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;

[0043] The herbicidal composition described above is used for the control of unwanted plants;

[0044] Furthermore, the unwanted plants are annual weeds and / or perennial weeds;

[0045] 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.

[0046] Annual or perennial weeds such as: barnyard grass (Echinochloa crus-galli), *Leptochloachinensis*, *Aisma orientalis* (Sam.) Juzep., *Cyperus difformis*, *Stellaria media*, *Protulaca oleracea*, wild oats (Avena fatua), wild wheat (Alopecurus aequalis), *Poa annua*, *Selerochloa kengiana*, *Beckmannia syzigachne*, *Polypogon fugax*, *Bromus japonicas*, *Galium aparine*, *Euphorbia helioscopia*, *Veronica persica*, *Malachium aquaticum*, *Sileneconoidea*, *Vaccaria segetalia*, and *Descurainia*. Sophia, Thlaspiarvense, Capsella bursa-pastoris, Lamium amplexicaule, Viciasativa, 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, Solanum nigrum, Physalis angulata, Acalypha australis, Celosia argentea, Amaranthus spinosus, Xanthium sibiricum, Ageratum conyzoides, Commelina communis, Paspalumdistichum, Japanese wheatgrass (Alopecurus japonicus), garland chrysanthemum (Abutilon theophrasti), quinoa (Chenopodium album), wrinkled sorrel (Rumex crispus), cassia (Cassia), celery (Cerastium arvense), speedwell (Veronica didyma), annual eel (Erigeron annuus), large vetch (Vicia sativa), Arabidopsis thaliana, sedge (Cyperus iria), water pepper (Polygonum hydropiper), bermudagrass (Cynodon dacylon), variegated ground ivy (Euphorbia maculata), dodder (Cuscutachinensis), rice weed (Lapsana apogonoides), sow thistle (Sonchus oleraceus), mountain sow thistle (Lxerischinensis), white cogongrass (Imperata cylindrical), small fleabane (Conyza canadensis), hop (Humulus scandens), wild raspberry (Cayratia) japonica, Conyza bonariensis, Artemisia argyi, Artemisia annua, Ixeris sonchifolia;

[0047] Furthermore, unwanted plant growing locations include rice paddies, soybean fields, corn fields, peanut fields, wheat fields, vegetable fields, and orchards;

[0048] Furthermore, the unwanted growing environment is rice paddies.

[0049] The beneficial effects of this invention are:

[0050] This invention improves herbicidal activity and has a significant synergistic effect. It can control multiple weeds in the field at the same time, expand the spectrum of weed control, make up for the shortcomings of single agents in controlling major weeds, and is safe for rice. It effectively reduces farmers' application costs and improves economic benefits. Detailed Implementation

[0051] 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.

[0052] Formulation preparation examples

[0053] To better illustrate the present invention, the following description, in conjunction with embodiments, further explains the content of the present invention.

[0054] Preparation Example 1

[0055] 30% Formula (I) Compound·Dimethomorph Suspension (2.5+27.5)

[0056] Formula composition: 2.5% compound of formula (I), 27.5% dimethylpentylene, 3% dodecyl polyoxyethylene ether phosphate, 3% fatty alcohol polyoxyethylene ether, 1.5% naphthalene sulfonate, 0.2% xanthan gum, 0.01% Kathon, 5% ethylene glycol, 1% magnesium aluminum silicate, 0.5% silicone defoamer, deionized water to make up the balance;

[0057] Preparation method: According to the formulation ratio in the example, the active ingredients, surfactants and other functional additives are placed in the reaction vessel in sequence, water is added and mixed evenly, and the mixture is subjected to high-speed shearing and wet sand milling to control the particle size of the material to be below 5μm for 90% of the particles. Finally, the suspension product is obtained by homogenization and filtration.

[0058] Preparation Example 2

[0059] 22% Formula (I) Compound·Dimethomorph Suspension (2+20)

[0060] Formula composition: 2% compound of formula (I), 20% dimethylpentylene, 2% polyether, 2% fatty amine polyoxyethylene ether, 1.5% polycarboxylate, 3% alkylphenol polyoxyethylene ether phosphate, 1% fumed silica, 0.5% sodium p-hydroxybenzoate, 0.25% xanthan gum, 5% glycerol, 0.5% silicone defoamer, deionized water to make up the balance;

[0061] Preparation method: According to the formulation ratio in the example, the active ingredients, surfactants and other functional additives are placed in the reaction vessel in sequence, water is added and mixed evenly, and the mixture is subjected to high-speed shearing and wet sand milling to control the particle size of the material to be below 5μm for 90% of the particles. Finally, the suspension product is obtained by homogenization and filtration.

[0062] Preparation Example 3

[0063] 20% Formula (I) Compound·Oxadiazon Suspension (5+25)

[0064] Formula composition: 5% compound of formula (I), 25% oxadiazon, 3% dodecyl polyoxyethylene ether phosphate, 2% alkylphenol polyoxyethylene ether methyl ether condensate sulfate, 1.5% block polyether, 0.4% magnesium aluminum silicate, 1% fumed silica, 4.5% ethylene glycol, 0.3% xanthan gum, 0.01% Kathon, 0.5% silicone defoamer, deionized water to make up the balance;

[0065] Preparation method: According to the formulation ratio in the example, the active ingredients, surfactants and other functional additives are placed in the reaction vessel in sequence, mixed evenly with oil, and then subjected to high-speed shearing and wet sand milling to control the particle size of the material to be below 90% of 5μm. Finally, the suspension product is obtained by homogenization and filtration.

[0066] Preparation Example 4

[0067] 12% Formula (I) Compound·Oxazinyl ether EC (4+20)

[0068] Formula composition: 2% compound of formula (I), 10% oxadiazon, 20% N,N-dimethylacetamide, 20% propylene carbonate, 2% calcium dodecylbenzenesulfonate, 13% fatty alcohol polyoxyethylene ether, 3% block polyether, and methyl oleate to make up the balance.

[0069] Preparation method: Add the active ingredients to the reaction vessel according to the formulation ratio of the example, and add surfactants and other functional additives. Stir and mix evenly in a stirring mixing vessel to obtain the emulsifiable oil product.

[0070] Preparation Example 5

[0071] 32% Formula (I) Compound·Dimethylpentylamine Water Dispersible Granules (4+28)

[0072] Formula composition: 4% compound of formula (I), 28% dimethylpentylene, 5% alkylnaphthalene formaldehyde condensate calcium sulfonate, 5% sodium polycarboxylate, 2% sodium alkylnaphthalene sulfonate, 0.5% organosilicon defoamer, 3% starch, 20% silica, and kaolin to make up the balance;

[0073] Preparation method: The active ingredient is added to the carrier, along with surfactants and other functional additives. The mixture is then pulverized by air jet milling, and 10% water is added. The mixture is then kneaded, granulated, dried, and sieved to obtain the water-dispersible granule product.

[0074] Preparation Example 6

[0075] 35% Formula (I) Compound·Dimethylpentylamine Water Dispersible Granules (5+30)

[0076] Formula composition: 5% compound of formula (I), 30% dimethylpentylene, 10% sodium alkyl naphthalene sulfonate, 6% sodium lignosulfonate, 4% sodium alkyl sulfate, 2% sodium naphthalene sulfonate, 4.5% sodium carboxymethyl cellulose, 0.5% organosilicon defoamer, 2.5% glucose, 20% silica, and clay to make up the balance;

[0077] Preparation method: The active ingredient is added to the carrier, along with surfactants and other functional additives. The mixture is then pulverized by air jet milling, and 10% water is added. The mixture is then kneaded, granulated, dried, and sieved to obtain the water-dispersible granule product.

[0078] Preparation Example 7

[0079] 40% Formula (I) Compound·Oxadiazon Water Dispersible Granules (8+32)

[0080] Formula composition: 8% compound of formula (I), 32% oxadiazon, 6% polycarboxylate GY-D06, 4% sodium dodecyl sulfate, 1% sodium alkyl sulfonate, 10% sodium lignosulfonate, 1% sucrose, 0.5% organosilicon defoamer, and clay to make up the balance;

[0081] Preparation method: The active ingredient is added to the carrier, along with surfactants and other functional additives. The mixture is then pulverized by air jet milling, and 10% water is added. The mixture is then kneaded, granulated, dried, and sieved to obtain the water-dispersible granule product.

[0082] Preparation Example 8

[0083] 10% Formula (I) Compound·Dimethylpentylene Dispersible Oil Suspension (1+9)

[0084] Formula composition: 1% compound of formula (I), 9% dimethylpentylene, 1% succinate sulfonate, 8% alkylphenol polyoxyethylene ether, 6% castor oil polyoxyethylene ether, 4% agricultural emulsion 1601#, 2% calcium dodecylbenzene sulfonate, 0.5% organobentonite, 1% fumed silica, 40% 200# solvent oil, soybean oil to make up the balance;

[0085] Preparation method: According to the formula ratio, the active ingredients, surfactants and other functional additives are placed in the reaction vessel in sequence, oil is added and mixed evenly, and then subjected to high-speed shearing, wet sand milling and finally homogenization filtration to obtain the dispersible oil suspension product.

[0086] Indoor activity test

[0087] Test basis: NY / T 1155.3-2006 "Guidelines for Indoor Bioassay of Pesticides - Herbicides Part 3: Determination of Herbicide Activity - Soil Spray Method"; NY / T 1155.7-2006 "Guidelines for Indoor Bioassay of Pesticides - Herbicides Part 7: Determination of Combined Effects of Mixtures".

[0088] Experimental method: potted plant method;

[0089] Experimental targets: barnyard grass, Echinochloa crus-galli, Monochoria lingua, Alisma plantago-aquatica, Stellaria media, Portulaca oleracea;

[0090] Test reagents: 85% pendimethalin technical grade, 97% oxadiazon technical grade, 80% compound (I) technical grade, all of which were provided by the Group's R&D Center.

[0091] Instruments and equipment: light incubator, spray tower, electronic balance, pots (9cm in diameter), beakers, pipettes;

[0092] 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.

[0093] Test material preparation and spraying: Test soil was quantitatively filled to 4 / 5 of the pot. The soil was thoroughly moistened using bottom irrigation. Pretreated weed seeds were evenly sown on the soil surface, and covered with 0.5-2.0 cm of soil depending on seed size. After 24 hours, a 3WP-2000 portable sprayer was used for spraying, supplementing water by bottom irrigation until the soil was completely saturated. The above-ground parts were weighed 21 days after application. Each treatment was replicated four times, with a blank control (no pesticide) included.

[0094] Wet control activity was investigated and recorded using the absolute value (numerical measurement) survey method. Fresh weight of local portions of each treatment was weighed, actual control efficacy was calculated, and the effect of the herbicide was evaluated according to the Colby method.

[0095] Based on the survey data, the actual prevention effect of each treatment was calculated according to the formula, in percentage form, and the result was rounded to two decimal places.

[0096] Actual control efficacy (E) of weed fresh weight = [(fresh weight of weeds in the control area - fresh weight of weeds in the treatment area) / fresh weight of weeds in the control area] × 100

[0097] The theoretical control efficacy (E0) of a compound herbicide = weed control efficacy of compound A at dosage P + weed control efficacy of compound B at dosage Q - (weed control efficacy of compound A at dosage P × weed control efficacy of compound B at dosage Q) / 100; Evaluation criteria for the combined effect of compound herbicides:

[0098] E-E0 > 10% indicates a synergistic effect, E-E0 < -10% indicates an antagonistic effect, and E-E0 between ±10% indicates an additive effect.

[0099] Experimental results:

[0100] Indoor activity tests showed that compound (I) exhibited good indoor activity when mixed with pendimethalin and oxadiazon in the treatment of common weeds such as barnyard grass, Echinochloa crus-galli, Alisma plantago-aquatica, Monochoria lingulata, Stellaria media, and Portulaca oleracea. Tables 1-6 show that the mass ratio of compound (I) to oxadiazon in the range of 1:5 to 3:1 enhanced the control efficacy against barnyard grass, Echinochloa crus-galli, Alisma plantago-aquatica, and Monochoria lingulata; the mass ratio of compound (I) to pendimethalin in the range of 1:28 to 3:4 enhanced the control efficacy against Stellaria media and Portulaca oleracea; and the mass ratio of compound (I) to pendimethalin in the range of 1:16 to 3:4 enhanced the control efficacy against barnyard grass and Echinochloa crus-galli.

[0101] Table 1 shows the combined effects of compound (I) with oxadiazon and pendimethalin on barnyardgrass.

[0102]

[0103]

[0104] Table 2 shows the synergistic effects of compound (I) with oxadiazon and pendimethalin on *Euphorbia lathyris*.

[0105]

[0106]

[0107] Table 3 shows the combined effects of compound (I) and oxadiazon with Alisma plantago-aquatica.

[0108]

[0109] Table 4 shows the combined effects of compound (I) and oxadiazon in combination with duckweed.

[0110]

[0111]

[0112] Table 5 shows the combined effects of compound (I) and dimethoate mixed with chickweed.

[0113]

[0114]

[0115] Table 6 shows the combined effects of compound (I) and pendimethalin on purslane.

[0116]

[0117] Field efficacy trials

[0118] Test time and location: Nanchang, Jiangxi Province, July 2022

[0119] The experimental crop was rice, and the target weeds were conventional weeds in rice paddies. The herbicide was applied 7 days after transplanting.

[0120] The experimental field was flat, with loam soil of moderate fertility and a pH of 7.1. A blank control was included, and each treatment was replicated four times. Each plot was 20 m². 2 Different treatment plots were randomly arranged in the experiment using a conventional spray method.

[0121] Investigation methods: On the day of treatment, record the types of weeds, the growth period of the main weeds, the growth period of rice, and the coverage of each plot; 5 days after treatment, visually observe the control effect; 21 days after treatment, investigate the fresh weight of weeds.

[0122] Methods for calculating drug efficacy:

[0123] Fresh weed control efficacy (%) = (Fresh weed mass in control area - Fresh weed mass in treatment area) / Fresh weed mass in control area × 100

[0124] The efficacy was calculated using the above formula, and significance analysis was performed using the new complex range method.

[0125] Crop survey: Observe whether the pesticide has any phytotoxicity to rice, record the type and degree of phytotoxicity, and classify and score the phytotoxicity of each plot according to the phytotoxicity classification method;

[0126] Level 1: The rice is growing normally and shows no signs of damage;

[0127] Level 2: Slight pesticide damage to rice, with damage less than 10%;

[0128] Level 3: Moderate pesticide damage to rice, which can recover and will not affect yield;

[0129] Level 4: Severe pesticide damage to rice, difficult to recover from, resulting in reduced yield;

[0130] Level 5: Severe pesticide damage to rice, irreversible, resulting in significant yield reduction or complete crop failure;

[0131] At the same time, accurately describe the symptoms of pesticide damage to rice and record the growth status of rice under all conditions.

[0132] Results and Analysis

[0133] Field surveys revealed that the main monocotyledonous weeds in rice paddies include foxtail grass, barnyard grass, goosegrass, and sedge, while dicotyledonous plants include alisma, duckweed, chickweed, and purslane.

[0134] Table 7 shows the overall control efficacy of herbicidal compositions containing compound (I) against weeds in paddy fields. The results indicate that 12% compound (I)·oxadiazon emulsifiable concentrate (1:5) and 10% compound (I)·pendimethalin dispersible oil suspension (1:9) achieved total control efficacy of 86.25% and 87.55% against monocotyledonous weeds, respectively. Using the Duncan's multiple range test (DMRT) for biostatistical analysis, the combined herbicides showed significantly better control efficacy than the single-agent control at the 0.01 and 0.05 levels. For dicotyledonous weeds, the combined herbicides achieved 93.09% and 94.65% control efficacy, respectively, which were superior to the single-agent control efficacy. The combined herbicides were also superior to the single-agent control, with significant differences at the 0.01 and 0.05 levels.

[0135] Table 7. Overall control efficacy of herbicidal compositions containing formula (I) against weeds in paddy fields.

[0136]

[0137]

[0138] Note: The efficacy in the table above is the overall efficacy. Uppercase letters represent the 1% highly significant level of difference, and lowercase letters represent the 5% significant level of difference.

[0139] Safety investigation: During the experiment, all tested pesticides were observed to be safe for rice growth, with no phytotoxicity observed. Observations 21 days after application showed, as shown in Table 8 below, that rice in each plot grew normally without any symptoms of damage, with a safety level of 1, indicating that all pesticides were safe for rice.

[0140] Table 8 Rice Safety Record Sheet

[0141]

[0142] In summary, the composition of the present invention is a combination of compound of formula (I) and oxadiazon and pendimethalin. Its activity and herbicidal effect are not a simple sum of the activities of each component. Compared with existing single formulations, it has significant biological activity and a significant synergistic effect on plots with mixed occurrences of various monocotyledonous and dicotyledonous weeds. It can delay resistance, has low pesticide residue, good safety, and meets the safety requirements of pesticide formulations.

[0143] Although the present invention has been described in detail above with general description and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention are within the scope of protection claimed by the present invention.

Claims

1. A herbicidal composition, characterized in that: The composition comprises active ingredient A and active ingredient B, wherein active ingredient A is a compound of formula (I). The active ingredient B is pendimethalin, and the weight ratio of active ingredient A to active ingredient B in the herbicidal composition is 1:28 to 10:

1.

2. The herbicidal composition according to claim 1, characterized in that: The mass ratio of the compound of formula (Ⅰ) to dimethylpentylamine is 1:28-5:

1.

3. The herbicidal composition according to claim 1, characterized in that: The mass ratio of the compound of formula (I) to dimethylpentylamine is 1:16-3:

4.

4. The herbicidal composition according to claim 1, characterized in that, The active ingredients A and B together constitute 5% to 90% of the herbicidal composition.

5. The herbicidal composition according to claim 1, characterized in that, The active ingredients A and B together constitute 10% to 60% of the herbicidal composition.

6. The herbicidal composition according to claim 1, characterized in that: In addition to the active ingredient, the herbicidal composition also includes agriculturally acceptable adjuvants selected from one or more of the following: wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoamers, solvents, preservatives, stabilizers, synergists, binders, dispersion media, fillers, or carriers.

7. The herbicidal composition according to claim 6, characterized in that: The herbicide composition can be formulated into liquid and / or solid formulations. Preferably, the dosage form is any one of emulsifiable concentrate, suspension concentrate, wettable powder, water-dispersible granules, and dispersible oil suspension.

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

9. The use according to claim 8, characterized in that: Unwanted plants are annual and / or perennial weeds.

10. The use according to claim 8, characterized in that: Undesirable growing environments include rice paddies, soybean fields, corn fields, peanut fields, wheat fields, vegetable fields, and orchards. The preferred, undesirable growing location is rice paddies.

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