A herbicidal composition

Abstract

The present invention discloses a herbicide composition comprising an active ingredient A and an active ingredient B, wherein the active ingredient A is a compound of formula (I) and the active ingredient B is selected from one of oxaziclomefone and pendimethalin. The mass ratio of active ingredient A to active ingredient B in the composition is 1:28 to 10:1. The present invention also relates to the use of the herbicide composition for controlling the germination or growth of weeds in useful plants, and is particularly suitable for controlling the germination or growth of weeds in rice fields.

Description

Technical Field

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

[0002] Rice is one of the main crops in my country. For a long time, barnyard grass, duckweed and three-cornered grass have been the three major weeds in rice fields. In addition, in some areas, due to the long-term and continuous use of pesticides such as pyrazosulfuron-methyl and benzylsulfuron-methyl, the damage caused by the previously serious malignant weeds duckweed and sedge has gradually eased, but the damage caused by perennial wild arrowhead and Alisma orientalis and annual raindrops, duckweed, wild water chestnuts and moss has worsened.

[0003] The compound of formula (I) is a novel isoxazole herbicide developed by Kumihiko Chemical Co., Ltd. of Japan. It is mainly used in rice fields before and after germination. It has a good control effect on grass and broad-leaved weeds, especially on weeds such as barnyard grass, raindrops and magnolia.

[0004] Pendimethalin is an organic compound from the dinitroaniline class of herbicides that primarily inhibits meristem cell division. It does not affect weed seed germination, but rather acts after weed shoots, stems, and roots absorb the agent during germination. It is suitable for controlling annual grasses and broadleaf weeds in corn, soybeans, cotton, vegetables, and orchards. Oxaziclomefone is a novel oxazinon-based herbicide for rice and lawns. Oxaziclomefone is highly safe for transplanted rice and exhibits high efficacy and long-lasting residual activity against annual rice weeds, particularly barnyardgrass.

[0005] Herbicides containing a single active ingredient have varying degrees of deficiencies in weed control. Continuous use can lead to weed resistance, a narrowing of the weed control spectrum, and environmental pollution. Rational compounding of herbicides is an effective method for improving control efficacy, expanding the weed control spectrum, delaying weed resistance, mitigating environmental pollution, reducing usage costs, and reducing herbicide residues. The applicant unexpectedly discovered that mixing the compound of formula (I) with pendimethalin or oxaziclomefone exhibits significant synergistic control against various annual or perennial weeds, while also reducing the dosage and cost of control, and offering crop safety advantages. Furthermore, a search revealed no reports of compound of formula (I) mixed with pendimethalin or oxaziclomefone for controlling annual or perennial weeds. Summary of the Invention

[0006] The object of the present invention is to provide a herbicide composition with reasonable components, low medication cost, obvious synergistic effect, good weed control effect, broad weed control spectrum and safety to crops.

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

[0008] Another object of the present invention is to provide use of the above-mentioned herbicidal composition for controlling annual or perennial weeds in rice fields.

[0009] In order to solve the above problems, the present invention provides the following technical solutions: a herbicidal composition comprising an active ingredient A and an active ingredient B, wherein the active ingredient A is a compound of formula (I):

[0010] The active ingredient B is selected from one or more of pendimethalin and oxazithromycin;

[0011] Furthermore, the weight ratio of active ingredient A to active ingredient B in the herbicidal composition is 1:28 to 10:1;

[0012] Furthermore, the mass ratio of the compound of formula (I) to oxazithromycin is 1:18 to 10:1;

[0013] Furthermore, the mass ratio of the compound of formula (I) to oxazithromycin 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;

[0014] Furthermore, the mass ratio of the compound of formula (I) to pendimethalin is 1:28-5:1;

[0015] Furthermore, the mass ratio of the compound of formula (I) to pendimethalin 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;

[0016] Furthermore, the mass ratio of the compound of formula (I) to pendimethalin is 1:16-3:4;

[0017] Furthermore, the mass of the active ingredient A and the active ingredient B accounts for 5% to 90% of the composition;

[0018] Furthermore, the mass of the active ingredient A and the active ingredient B accounts for 10% to 60% of the composition;

[0019] Furthermore, the herbicidal composition further comprises, in addition to the active ingredient, agriculturally acceptable auxiliary ingredients, wherein the auxiliary ingredients are selected from one or more of a wetting agent, a dispersant, an emulsifier, a thickener, a disintegrant, an antifreeze agent, a defoaming agent, a solvent, a preservative, a stabilizer, a synergist or a carrier;

[0020] Further, the wetting agent is selected from one or more of alkylbenzene sulfonate, alkylnaphthalene sulfonate, lignin sulfonate, sodium lauryl sulfate, sodium dioctyl sulfosuccinate, α-olefin sulfonate, alkylphenol polyoxyethylene ether, castor oil polyoxyethylene ether, alkylphenol ethoxylate, fatty alcohol ethoxylate, fatty alcohol polyoxyethylene ether sodium sulfate, silkworm feces, soapberry powder, soapberry powder, SOPA, detergent, emulsifier 2000 series and wetting penetrant F; and / or

[0021] Further, the dispersant is selected from one or more of lignin sulfonate, alkylnaphthalene 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

[0022] Furthermore, the emulsifier is selected from one or more of calcium dodecylbenzenesulfonate, alkylphenol formaldehyde resin polyoxyethylene ether, phenylethylphenol polyoxyethylene polyoxypropylene ether, fatty alcohol ethylene oxide-propylene oxide copolymer, styrylphenol polyoxyethylene ether, castor oil polyoxyethylene ether and alkylphenol ether phosphate; and / or

[0023] Furthermore, the thickener is selected from one or more of xanthan gum, organobentonite, gum arabic, sodium alginate, magnesium aluminum silicate, carboxymethyl cellulose and white carbon black; and / or

[0024] Furthermore, 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

[0025] Furthermore, the antifreeze agent is selected from one or more of alcohols, alcohol ethers, chlorinated hydrocarbons and inorganic salts; and / or

[0026] Further, the defoaming agent is selected from C 10 -C 20 Saturated fatty acid compounds, silicone oil, silicone compounds, C8-C 10 One or more of fatty alcohols; and / or

[0027] Furthermore, 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, solvent oil, vegetable oil, vegetable oil derivatives and water; and / or

[0028] Furthermore, 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, kasone and 1,2-benzisothiazolin-3-one; and / or

[0029] Furthermore, 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, white carbon black, talc, montmorillonite and starch; and / or

[0030] Furthermore, the synergist is selected from phosphine, piperonyl butoxide; and / or

[0031] Further, 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;

[0032] Furthermore, the herbicidal composition can be prepared into an agriculturally acceptable formulation;

[0033] Furthermore, the herbicide composition can be prepared into a solid preparation and / or a liquid preparation.

[0034] The solid preparation is any one of powder, granules, wettable powder, water-dispersible granules, soluble powder, and soluble granules;

[0035] The liquid preparation is any one of an emulsifiable concentrate, a suspension concentrate, an aqueous solution, an aqueous emulsion, a microemulsion, a soluble solution, and a dispersible oil suspension;

[0036] Furthermore, the dosage form is any one of emulsifiable concentrate, suspension concentrate, wettable powder, water dispersible granules, and dispersible oil suspension concentrate;

[0037] Furthermore, the composition is an emulsifiable concentrate, and the components and contents of the emulsifiable concentrate are preferably: active ingredient A0.1~

[0038] 100 parts, active ingredient B 0.1-100 parts, emulsifier 0.1-20 parts, solvent makes up the balance;

[0039] Furthermore, the composition is a suspension concentrate, and the components and contents of 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 making up the balance;

[0040] Furthermore, the composition is a wettable powder, and the components and contents of the wettable powder are preferably: 0.1 to 100 parts of active ingredient A, 0.1 to 100 parts of active ingredient B, 1 to 20 parts of dispersant, 1 to 15 parts of wetting agent, and the balance is made up of fillers;

[0041] Furthermore, the composition is a water-dispersible granule, and the components and contents of 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 the balance is made up of filler;

[0042] Furthermore, the composition is a dispersible oil suspension, and the components and contents of the dispersible oil suspension 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 the balance of dispersion medium;

[0043] Use of a herbicidal composition as described above for controlling unwanted plants;

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

[0045] Furthermore, the unwanted plants are annual weeds and / or perennial weeds of the Poaceae, Rubiaceae, Euphorbiaceae, Cyperaceae, Asteraceae, Polygonaceae, Scrophulariaceae, Solanaceae, Amaranthaceae, Caryophyllaceae, Cruciferae, Lamiaceae, Fabaceae, Convolvulaceae, Boraginaceae, Commelinaceae, Malvaceae, and Chenopodiaceae families;

[0046] Annual or perennial weeds such as: Echinochloa crus-galli, Leptochloachinensis, Alisma orientalis (Sam.) Juzep., Cyperus difformis, Stellaria media, Protulaca oleracea, Avena fatua, 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, Stellariaalsine, 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, Alopecurus japonicus, Abutilon theophrasti, Chenopodium album, Rumex crispus, Cassiatora, Cerastium arvense, Veronica didyma, Erigeron annuus, Vicia sativa, Arabidopsis thaliana, Cyperus iria, Polygonum hydropiper, Cynodon dacylon, Euphorbia maculata, Cuscutachinensis, Lapsana apogonoides, Sonchus oleraceus, Lxerischinensis, Imperata cylindrical, Conyza canadensis, Humulus scandens, Cayratia japonica, Conyza bonariensis, Artemisiaargyi, Artemisia annua, Ixeris sonchifolia;

[0047] Furthermore, the growth sites of the unwanted plants are rice fields, soybean fields, corn fields, peanut fields, wheat fields, rice fields, vegetable fields, and orchards;

[0048] Furthermore, the growth site of the unwanted plants is a rice field.

[0049] Beneficial effects of the present invention:

[0050] The invention improves herbicidal activity and has a significant synergistic effect. It can simultaneously control multiple weeds in the field, expands the weed control spectrum, and makes up for the defect that a single agent has poor control effect on major weeds. It is also safe for rice, effectively reduces farmers' pesticide application costs, and improves economic benefits. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the present invention more concise and clear, the present invention is illustrated by the following specific embodiments, but the present invention is by no means limited to these embodiments. The embodiments described below are only preferred embodiments of the present invention and can be used to describe the present invention. They should not be understood as limiting the scope of the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0052] Preparation Example

[0053] In order to better illustrate the present invention, the present invention is further described below in conjunction with embodiments.

[0054] Preparation Example 1

[0055] 30% formula (Ⅰ) compound·Pendimethalin suspension (2.5+27.5)

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

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

[0058] Preparation Example 2

[0059] 22% formula (Ⅰ) compound·Pendimethalin suspension (2+20)

[0060] Formula composition: 2% compound of formula (I), 20% pendimethalin, 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% organosilicon defoamer, and deionized water to make up the balance;

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

[0062] Preparation Example 3

[0063] 20% formula (Ⅰ) compound·oxaziclomefone suspension (5+25)

[0064] Formula composition: 5% compound of formula (I), 25% oxaziclomefone, 3% lauryl 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% kason, 0.5% organosilicon defoamer, and deionized water to make up the balance;

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

[0066] Preparation Example 4

[0067] 12% formula (Ⅰ) compound oxazithromycin ether emulsifiable concentrate (4+20)

[0068] Formula composition: 2% compound of formula (I), 10% oxaziclomefone, 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 into a reactor according to the formula ratio of the embodiment, add surfactants and other functional additives, and stir and mix them evenly in a stirring mixing kettle to obtain an emulsifiable concentrate product.

[0070] Preparation Example 5

[0071] 32% formula (Ⅰ) compound·Pendimethalin water dispersible granules (4+28)

[0072] Formula composition: 4% compound of formula (I), 28% pendimethalin, 5% alkylnaphthalene formaldehyde condensate calcium sulfonate, 5% polycarboxylic acid sodium salt, 2% alkylnaphthalene sodium sulfonate, 0.5% organosilicon defoamer, 3% starch, 20% white carbon black, and kaolin makes up the balance;

[0073] Preparation method: Add the active ingredient into the carrier, add surfactant and other functional additives, mix, add 10% water after air flow grinding, and then knead, granulate, dry and sieve to obtain water-dispersible granule product.

[0074] Preparation Example 6

[0075] 35% formula (Ⅰ) compound·Pendimethalin water dispersible granules (5+30)

[0076] Formula composition: 5% compound of formula (I), 30% pendimethalin, 10% sodium alkylnaphthalene sulfonate, 6% sodium lignin sulfonate, 4% sodium alkyl sulfate, 2% sodium naphthalene sulfonate, 4.5% sodium carboxymethyl cellulose, 0.5% organosilicon defoamer, 2.5% glucose, 20% white carbon black, and clay makes up the balance;

[0077] Preparation method: Add the active ingredient into the carrier, add surfactant and other functional additives, mix, add 10% water after air flow grinding, and then knead, granulate, dry and sieve to obtain water-dispersible granule product.

[0078] Preparation Example 7

[0079] 40% formula (Ⅰ) compound·oxaziclomefone water dispersible granules (8+32)

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

[0081] Preparation method: Add the active ingredient into the carrier, add surfactant and other functional additives, mix, add 10% water after air flow grinding, and then knead, granulate, dry and sieve to obtain water-dispersible granule product.

[0082] Preparation Example 8

[0083] 10% compound of formula (I)·Pendimethalin dispersible oil suspension (1+9)

[0084] Formula composition: 1% compound of formula (I), 9% pendimethalin, 1% succinic acid sulfonate, 8% alkylphenol polyoxyethylene ether, 6% castor oil polyoxyethylene ether, 4% Nongru 1601#, 2% calcium dodecylbenzenesulfonate, 0.5% organic bentonite, 1% fumed silica, 40% 200# solvent oil, and soybean oil makes up the balance;

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

[0086] Indoor activity test

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

[0088] Test method: potting method;

[0089] Test targets: Echinochloa crus-galli, Leptochloa chinensis, Dalbergia vaginalis, Alisma orientalis, Chickweed, and Portulaca oleracea;

[0090] Test agents: 85% pendimethalin technical, 97% oxazithromycin technical, 80% technical of the compound of formula (I), all of which were provided by the group's R&D center.

[0091] Instruments and equipment: light incubator, spray tower, electronic balance, pot (9 cm in diameter), beaker, pipette;

[0092] Preparation of drugs: Water-soluble drugs are directly dissolved and diluted with water. Other drugs are dissolved in a suitable solvent (acetone, dimethylformamide or dimethyl sulfoxide, etc.) and diluted with 0.1% Tween 80 aqueous solution.

[0093] Test Material Preparation and Spraying: Fill the pots with test soil to a quantitative level 4 / 5 of the way up. Use bottom-of-pot infiltration irrigation to completely moisten the soil. Evenly sow the pretreated test weed seeds on the soil surface and cover with soil to a depth of 0.5-2.0 cm, depending on seed size. After 24 hours of covering, spray the soil using a 3WP-2000 walking spray tower. Water the soil by irrigating the bottom of the pots until it is completely moistened to saturation. 21 days after application, measure the fresh weight of the above-ground portion. Four replicates were used for each treatment, and a blank treatment without the pesticide served as a blank control.

[0094] The absolute value (number measurement) survey method was used to investigate and record the herbicidal activity. The fresh weight of the local part of each treatment was weighed to calculate the actual control effect. The effect of the agent was evaluated according to the Colby method.

[0095] Based on the survey data, the actual prevention effect of each treatment is calculated according to the formula. The unit is percentage, and the calculation result is rounded to two decimal places.

[0096] Actual weed control effect (E) = [(weed fresh weight in blank area - weed fresh weight in treated area) / weed fresh weight in blank area] × 100

[0097] Theoretical control efficacy of mixed herbicides (E0) = 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 mixed agents:

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

[0099] Test results:

[0100] Indoor activity indicates that the compound of formula (I) mixed with pendimethalin and oxaziclomefone exhibits good indoor activity against common weeds such as barnyard grass, chinensis, oriental dwarfism, radix schizonepetae, chickweed, and purslane. The results in Table 1-6 show that the compound of formula (I) has a synergistic effect against barnyard grass, chinensis, oriental dwarfism, and radix schizonepetae at a mass ratio of 1:5 to 3:1; the compound of formula (I) has a synergistic effect against chickweed and purslane at a mass ratio of 1:28 to 3:4; and the compound of formula (I) has a synergistic effect against barnyard grass and chinensis at a mass ratio of 1:16 to 3:4.

[0101] Table 1 Combined effects of compound of formula (I) mixed with oxaziclomefone and pendimethalin on barnyard grass

[0102]

[0103] Table 2 Combined effects of compound of formula (I) mixed with oxaziclomefone and pendimethalin on Leptochloa chinensis

[0104]

[0105] Table 3 Combined effects of the compound of formula (I) and oxaziclomefone on Rhizoma Alismatis

[0106]

[0107] Table 4: Combined effects of the compound of formula (I) and oxaziclomefone on Dalbergia vaginalis

[0108]

[0109]

[0110] Table 5 Combined effects of compound of formula (I) and pendimethalin on Chickweed

[0111]

[0112] Table 6 Combined effects of compound of formula (I) and pendimethalin on Portulaca oleracea

[0113]

[0114] Field efficacy trials

[0115] Test time and location: Nanchang, Jiangxi, July 2022

[0116] The experimental crop was rice, and the control targets were common weeds in rice fields. The pesticide was applied 7 days after transplanting.

[0117] The experimental field is flat, the soil is loam, fertility is medium, pH value is 7.1. A blank control is set, each treatment is repeated 4 times, and each plot is 20m2 The different treatment plots of the experiment were arranged in random blocks and the conventional spray method was used.

[0118] Investigation method: On the day of treatment, record the weed species, growth period of major weeds, growth period of rice and coverage in each plot; 5 days after treatment, visually observe the control situation; 21 days after treatment, conduct a weed fresh weight survey.

[0119] Calculation method of drug efficacy:

[0120] Fresh mass control effect (%) = (fresh mass of weeds in the blank control area - fresh mass of weeds in the treatment area) / fresh mass of weeds in the blank control area × 100

[0121] The protective effect was calculated according to the above formula, and the significance analysis was performed using the new multiple range method.

[0122] Crop survey: Observe whether the pesticide has any effect on rice, record the type and extent of the damage, and assign a grade and score to each plot according to the pesticide damage grading method;

[0123] Level 1: Rice grows normally without any damage symptoms;

[0124] Level 2: Slight damage to rice, with damage to less than 10% of the rice;

[0125] Level 3: Moderate damage to rice, which can be recovered later and has no impact on yield;

[0126] Level 4: The rice is severely damaged by pesticides and is difficult to recover, resulting in reduced yields;

[0127] Level 5: The rice is severely damaged by pesticides and cannot be recovered, resulting in a significant reduction in yield or even complete failure;

[0128] At the same time, accurately describe the symptoms of rice damage and record the growth status of rice under all circumstances.

[0129] Results and Analysis

[0130] Field surveys found that the main monocotyledonous weeds in rice fields include foxtail grass, barnyard grass, goosegrass, and Leptochloa chinensis, while the dicotyledonous plants include Alisma orientalis, Duck tongue grass, Chickweed, and Portulaca oleracea.

[0131] The results of the total control effect of the herbicidal composition containing the compound of formula (I) on rice field weeds in Table 7 show that the total weed control effects of 12% compound of formula (I)·oxaziclomefone ether emulsifiable concentrate (1:5) and 10% compound of formula (I)·dimethoate dispersible oil suspension concentrate (1:9) on monocotyledons were 86.25% and 87.55%, respectively. The biostatistical analysis method using the Duncan's new multiple range (DMRT) method showed that the combined agent was superior to the total weed control effect of the control single agent at the 0.01 and 0.05 levels, and the difference was significant; the total weed control effect on dicotyledons was 93.09% and 94.65%, respectively, which were superior to the total weed control effect of the control single agent. The combined agent was superior to the single agent, and there was a significant difference at the 0.01 and 0.05 levels.

[0132] Table 7 Total control effect of the herbicidal composition containing the compound of formula (I) on weeds in rice fields

[0133]

[0134] Note: The control effect in the above table refers to the overall control effect. Capital letters represent extremely significant differences at the 1% level, and lowercase letters represent significant differences at the 5% level.

[0135] Safety Investigation: During the trial, all tested pesticides were observed to be safe for rice growth, with no signs of damage. Observations 21 days after application, as shown in Table 8 below, showed normal rice growth in all plots, with no signs of damage. The safety rating was 1 for all tested pesticides, indicating that all tested pesticides were safe for rice.

[0136] Table 8 Rice safety status record

[0137]

[0138] In summary, the composition of the present invention adopts a compound of formula (I) with oxazithromycin and pendimethalin. Its activity and herbicidal effect are not a simple superposition of the activities of each component. Compared with the existing single formulations, it has significant biological activity and synergistic effect on plots with mixed infestation of multiple monocotyledonous and dicotyledonous weeds, can delay resistance, has low pesticide residue, is safe, and meets the safety requirements of pesticide formulations.

[0139] Although the present invention has been described in detail above using general descriptions and specific implementation plans, it is obvious to those skilled in the art that some modifications or improvements can be made thereto based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention shall fall 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, The active ingredient A is a compound of formula (I) (I), the active ingredient B is oxaziclomefone, and the weight ratio of the active ingredient A to the active ingredient B in the herbicidal composition is 1:28~10:

1.

2. The herbicidal composition according to claim 1, wherein: The mass ratio of the compound of formula (I) to oxazithromycin is 1:18 to 10:

1.

3. The herbicidal composition according to claim 1, wherein: The mass ratio of the compound of formula (I) to oxazithromycin is 1:5-3:

1.

4. The herbicidal composition according to claim 1, wherein: The total mass of the active ingredient A and the active ingredient B accounts for 5% to 90% of the herbicidal composition.

5. The herbicidal composition according to claim 1, wherein: The total mass of the active ingredient A and the active ingredient B accounts for 10% to 60% of the herbicidal composition.

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

7. The herbicidal composition according to claim 6, wherein: The herbicidal composition is prepared into a liquid preparation and / or a solid preparation, and the preparation is any one of emulsifiable concentrate, suspension concentrate, wettable powder, water-dispersible granules and dispersible oil suspension concentrate.

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

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

10. The use according to claim 8, characterized in that: The places where unwanted plants grow are rice fields, soybean fields, corn fields, peanut fields, wheat fields, vegetable fields, and fruit orchards.

11. The use according to claim 10, characterized in that: The unwanted plants grow in rice paddies.

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