Weeding method and herbicide for relieving phytotoxicity of sethoxydim to gramineous crops

Abstract

The invention relates to the technical field of pesticides, in particular to a weeding method and herbicide for relieving phytotoxicity of sethoxydim to gramineous crops. The sethoxydim and imazethapyr are compounded according to the weight ratio of 1: (0.10-3.00), so that the herbicide phytotoxicity of the sethoxydim to gramineous crops can be obviously reduced, and the herbicide composition has a synergistic effect on weeds. The sethoxydim and imazethapyr are compounded according to the proportion, so that the composition can be used as a special ideal herbicide for an intercropping field of gramineous crops and broad-leaved crops, the problem that the safety of gramineous crops is difficult to guarantee while gramineous weeds are difficult to effectively prevent and treat in the intercropping field of the gramineous crops and the broad-leaved crops is solved, and the application range of the sethoxydim is expanded.

Description

Technical Field

[0001] This invention relates to the field of pesticide technology, specifically to a herbicide method and herbicide that reduces the phytotoxicity of clethodim to gramineous crops. Background Technology

[0002] my country is vigorously developing intercropping, which includes the intercropping of gramineous crops and broadleaf crops. Soybeans and corn, as two different crop types, commonly use different herbicides. Herbicides used to control gramineous weeds in soybean fields often cause severe phytotoxicity to corn, and conversely, commonly used herbicides in corn fields often cause severe phytotoxicity to soybeans. This makes weed control a challenge during the promotion of intercropping, necessitating the development of herbicides that are highly safe for both gramineous and broadleaf crops and have good weed control effects.

[0003] The promotion of genetically modified herbicide-tolerant varieties and new varieties has provided an effective way to control weeds in fields where grass and broadleaf crops are intercropped. However, long-term use of a single target herbicide can lead to problems such as herbicide resistance. It is necessary to rotate the use of genetically modified varieties with conventional herbicides in order to better leverage the advantages of genetically modified varieties. Therefore, it is still of great significance to develop conventional herbicides that have high safety for both grass and broadleaf crops.

[0004] Pfofol, chemically known as 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxycyclohexane-2-enone, commonly known as "Napogon," is a selective post-emergence herbicide. It exhibits high activity against almost all grassy weeds, such as barnyard grass, wild oats, foxtail grass, wild wheatgrass, crabgrass, and goosegrass, but is ineffective and safe against broadleaf weeds. Therefore, pfofol is specifically used for controlling grassy weeds in broadleaf crop fields. While safe for broadleaf crops, its application in grassy crops can easily cause phytotoxicity, thus limiting its use in intercropping. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a herbicide method that can significantly reduce the phytotoxicity of clethodim to gramineous crops, and to solve the problem of ensuring the safety of gramineous crops while effectively controlling gramineous weeds in intercropping fields of gramineous and broadleaf crops.

[0006] Another objective of this invention is to provide a special herbicide for intercropping fields of gramineous crops and broadleaf crops, which has significantly less phytotoxicity to gramineous crops than haloxyfop alone, and has a better weeding effect.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solution.

[0008] This invention provides a herbicide method to reduce the phytotoxicity of clethodim to gramineous crops. The method involves using clethodim in combination with imidazoline, wherein the weight ratio of clethodim to imidazoline is 1:0.10-3.00. This invention has found that, compared to using clethodim alone, the combination of clethodim and imidazoline within the above range significantly increases the plant height and fresh weight of gramineous crops, thereby significantly reducing the phytotoxicity of clethodim to gramineous crops.

[0009] In a preferred embodiment, the weight ratio of tebuconazole and imidazole nicotinic acid is 1:0.13-1.00, more preferably 1:0.15-0.50.

[0010] As one embodiment, the gramineous crops described in this invention include any one or more of maize, rice, wheat, millet, and sorghum.

[0011] In a preferred embodiment, the clethodim and imidazoline compound of the present invention are used for weed control in fields where gramineous crops and broadleaf crops are intercropped. Clethodim is safe for broadleaf crops, and when combined with imidazoline, it can significantly reduce the phytotoxicity of clethodim to gramineous crops, thus making it safe for weed control in fields where gramineous crops and broadleaf crops are intercropped.

[0012] As one implementation method, the broadleaf crops described in this invention include any one or more of soybeans, peanuts, cotton, potatoes, and rapeseed, but this is not a limitation on the technical solution of this invention. The gramineous crops and the broadleaf crops described in this invention can be intercropped in any one or more combinations under feasible conditions, such as corn-soybean intercropping, wheat-peanut intercropping, rice-potato intercropping, millet-rapeseed intercropping, etc. Compared to the use of clethodim alone, this invention combines clethodim with imidazoline in the intercropping of the above-mentioned gramineous crops and broadleaf crops, which is safe for crops and has good weed control effect.

[0013] The above-described weed control method of the present invention can control all weed species of the control spectrum of clethodim and imidazoline, including thistle, dayflower, black nightshade, millet, amaranth, knotweed, lambsquarters, cocklebur, barnyard grass, crabgrass, goosegrass, goosegrass, foxtail, brome, and other weeds. In specific embodiments, clethodim and imidazoline of the present invention have a synergistic effect on the control efficacy of crabgrass and foxtail within the compound range, significantly improving the weed control effect in fields intercropped with gramineous and broadleaf crops.

[0014] The method for combining tebuconazole and imidazoline of the present invention includes, but is not limited to, preparing a mixed formulation, mixing in a tank, or adding other active ingredients or adjuvants. The method of application is foliar spraying, and the optimal application period is when the weeds are at the 1-4 leaf stage for the best effect.

[0015] In one embodiment, the present invention prepares a herbicide from clethodim and imidazoline for weed control, particularly for field weed control in intercropping fields of gramineous and broadleaf crops. The total effective ingredient dosage of clethodim and imidazoline is 50-300 g / hm². 2 Further preferred is 100-250 g / hm 2 More preferably 150-280 g / hm 2 .

[0016] This invention also provides a specific herbicide for intercropping fields of gramineous crops and broadleaf crops. The herbicide comprises clethodim and imidazoline, wherein the weight ratio of clethodim to imidazoline is 1:0.10-3.00, preferably 1:0.13-1.00, and more preferably 1:0.15-0.50. Within the above ratio range, compared to clethodim alone, the specific herbicide is safer for both gramineous and broadleaf crops in intercropped fields and has higher weed control efficacy.

[0017] In the herbicide of the present invention, the tebufenozide and imidazoline account for 1%-90% of the total weight of the herbicide, preferably 5%-60%.

[0018] The herbicide of the present invention can be added with agriculturally acceptable adjuvants and / or carriers, and can be processed into any pesticide-acceptable formulation as needed, such as emulsifiable concentrates, microemulsions, water-dispersible granules, suspension emulsions, water-in-oil emulsions, oil suspensions, suspensions, wettable powders, soluble powders, dry suspensions, aqueous solutions, oils, and microcapsule suspensions, with preferred formulations being emulsifiable concentrates, microemulsions, and water-dispersible granules.

[0019] The agriculturally acceptable adjuvants and / or carriers described in this invention include, but are not limited to: solvents, emulsifiers, stabilizers, antifreeze agents, wetting agents, dispersants, binders, disintegrants, release agents, defoamers, carriers, fillers, co-emulsifiers, thickeners, density adjusters, pH adjusters, preservatives, penetrants, antisettling agents, etc.

[0020] The solvent may be one or more of methanol, dimethyl sulfoxide, xylene, toluene, cyclohexanone, ethanol, benzene, chloroform, isopropanol, acetone, acetonitrile, ethyl acetate, propanol, butanol, ethylene glycol, diethyl ether, butyl ether, and N,N-dimethylformamide.

[0021] The emulsifier may be calcium dodecylbenzenesulfonate, benzyl biphenol polyoxyethylene polyoxypropylene ether, octylphenol polyoxyethylene ether, styrene polyoxyethylene ether ammonium sulfate, benzyl biphenol polyoxyethylene ether, magnesium dodecylbenzenesulfonate, phenethylphenol polyoxyethylene polyoxypropylene ether, C8-C 20One or more of the following: sodium alkyl sulfate, sodium dodecyl sulfate, nonylphenol polyoxyethylene ether (NP), octylphenol polyoxyethylene polyoxypropylene ether, nonylphenol polyoxyethylene polyoxypropylene ether, benzylphenol polyoxyethylene polyoxypropylene ether, phenethylphenol polyoxyethylene ether, alkylphenol polyoxyethylene ether (agricultural emulsion 100), dibenzyl biphenol polyethoxyethylene ether (agricultural emulsion 300), phenethylphenol formaldehyde resin polyoxyethylene ether (agricultural emulsion 400), phenethylphenol polyoxyethylene ether (agricultural emulsion 600), and alkylphenol formaldehyde resin polyoxyethylene ether (agricultural emulsion 700);

[0022] The stabilizer may be one or more of butyl glycidyl ether, 3-chloro-1,2-epoxypropane, phenyl glycidyl ether, tolyl glycidyl ether, polyvinyl glycol diglycidyl ether, and sodium sorbate.

[0023] The antifreeze agent may be one or more of polyethylene glycol, propylene glycol, ethylene glycol, glycerol, sorbitol, glycerin, urea, ammonium sulfate, NaCl, CaCl2, glycerol-ethyl ether diethylene glycol, and methylpropylene diethylene glycol.

[0024] The wetting agent may be one or more of the following: fatty alcohol ethoxylate, sodium octadecyl succinate, sodium lauryl sulfate, sodium dioctyl succinate sulfonate, sodium diisopropyl naphthalene sulfonate, nonylphenol polyoxyethylene ether (NP), octylphenol polyoxyethylene ether, tridecyl alcohol polyoxyethylene ether, sodium dodecyl sulfate, alkylphenol ethoxylate, and naphthalene sulfonate.

[0025] The dispersant may be one or more of the following: sodium dibutylnaphthalene sulfonate formaldehyde condensate, polyoxyethylene polyoxypropylene ether block copolymer, alkylphenol polyoxyethylene ether formaldehyde condensate sulfate, alkylphenol polyoxyethylene phosphate, sodium lignosulfonate, calcium lignosulfonate, ammonium lignosulfonate, alkylnaphthalene sulfonate formaldehyde condensate, sodium dibutylnaphthalene sulfonate, sodium methylaminoethyl oleate sulfonate, polyvinyl alcohol, gum arabic, sodium naphthalene sulfonate formaldehyde condensate, sodium methylnaphthalene sulfonate formaldehyde condensate, fatty alcohol ethylene oxide adduct phosphate, alkylphenol polyoxyethylene ether phosphate, and sodium naphthalene sulfonate formaldehyde condensate.

[0026] The adhesive may be one or more of ethylene-vinyl acetate copolymer, soluble starch, polyvinyl acetate polymer, and polyvinyl alcohol.

[0027] The disintegrant can be one or more of calcium chloride, thioamine, and aluminum chloride;

[0028] The separating agent can be one or more of aerosol silica gel and amorphous silica gel.

[0029] The defoamer may be one or more of the following: stearic acid, lauric acid, isooctanol, isoamyl alcohol, ethylene oxide-propylene oxide block copolymer, and nonionic soap defoamers;

[0030] The carrier and / or filler may be one or more of the following: silica, bentonite, diatomite, kaolin, activated clay, attapulgite, light calcium carbonate, talc, pyrophyllite, clay, bentonite, carbonates, and talc powder.

[0031] The co-emulsifier may be one or more of butanol, isobutanol, dodecyl alcohol-1, tetradecyl alcohol-1, octadecyl alcohol-1, nonadecanol-1, and eicosyl alcohol-1;

[0032] The thickener may be one or more of the following: xanthan gum, gelatin, gum arabic, magnesium aluminum silicate, diatomaceous earth, bentonite, polyacrylate, natural polysaccharide, xanthan gum, gypsum, clay, water glass, sodium carboxymethyl starch, soluble starch, sodium carboxymethyl cellulose, sodium alginate, agar, and hydroxyethyl cellulose.

[0033] The density regulator can be one or more of NaCl, CaCl2, and urea;

[0034] The pH adjuster may be one or more of borax, sodium hydroxide, sodium carbonate, disodium hydrogen phosphate, and sodium bicarbonate.

[0035] The preservative may be one or more of formaldehyde, sodium salicylate, sodium benzoate, 1,2-benzothiazolin-3-one, 2-hydroxybiphenyl, sorbic acid, benzoic acid, benzaldehyde, p-hydroxybenzaldehyde, and p-hydroxybenzoate.

[0036] The penetrant may be one or more of sodium lauryl sulfate, sodium dioctyl succinate sulfonate, sodium diisopropyl naphthalene sulfonate, nonylphenol polyoxyethylene ether (NP), octylphenol polyoxyethylene ether, and tridecyl alcohol polyoxyethylene ether.

[0037] The anti-settling agent may be one or more of the following: kaolin, xanthan gum, polyoxyethylene fatty amine, polyoxyethylene fatty alcohol sulfate, and polydiol ether.

[0038] In one embodiment, the herbicide, when it is an emulsifiable concentrate, comprises the following components and weight percentages: 3%–60% tebufenozide, 1%–30% imidazoline, 5%–95% solvent, and 1%–20% emulsifier.

[0039] For example, the preparation method can be as follows: add oxadixyl technical, imidazole ethionyl acid technical and emulsifier to the solvent in sequence under stirring, stir thoroughly to make a single-phase transparent liquid, and filter to remove impurities.

[0040] In one embodiment, when the herbicide is a microemulsion, it comprises the following components and weight contents: 1%–40% tebuconazole, 0.5%–25% imidazoline, 5%–50% solvent, 10%–20% emulsifier, 0.5%–3% stabilizer, 2%–10% antifreeze, and deionized water to make up the balance.

[0041] The preparation method can be as follows: thoroughly mix oxadixyl technical, imidazole ethionyl acid technical, solvent, emulsifier, stabilizer and antifreeze to form a uniform and transparent oil phase; slowly add deionized water under stirring to form a water-in-oil emulsion, then stir and heat to make it phase-inverted to oil-in-water, and filter after cooling to room temperature.

[0042] In one embodiment, when the herbicide is a water-dispersible granule, it comprises the following components and weight contents: 5%–50% tebufenozide, 1%–30% imidazoline, 10%–60% carrier, 1%–3% wetting agent, 3%–20% dispersant, 0.1%–2% binder, 1%–5% disintegrant, 0.1%–2% release agent, 0.1%–5% defoamer, and filler to make up the balance.

[0043] The preparation method can be as follows: First, the technical grade of tebuconazole is adsorbed onto a carrier and dried. Then, the carrier with adsorbed tebuconazole, imidazole acetonic acid technical grade, wetting agent, dispersant, binder, disintegrant, separating agent, and filler are added to water and ground. An antifoaming agent is then added under the action of a homogenizer to obtain a slurry. The slurry is then sent to a drying tower for spray drying, and after sieving, the product is obtained.

[0044] The present invention has the following positive and beneficial effects:

[0045] 1. This invention combines clethodim and imidazoline, which significantly reduces phytotoxicity to gramineous crops compared to using clethodim alone. It can be applied to weed control in gramineous crop fields or fields intercropped with broadleaf crops. The combination of the two improves the safety of gramineous crops and expands the application range of clethodim.

[0046] 2. The present invention combines tebuconazole and imidazoline for field weed control, which has a significant synergistic effect on weed control efficacy;

[0047] 3. The mechanisms of action of tebuconazole and imidazoline are different, and their combined use can delay the development of herbicide resistance in weeds. Attached Figure Description

[0048] Figure 1 In the bioassay example, the dosage of tebufenozide was 112.5 g ai / hm. 2 Used alone, and in combination with imidazole nicotinic acid at doses of 25, 37.5, and 50 g ai / hm. 2The effects of mixed application on corn phytotoxicity 7 days after application are shown in the figure. As can be seen from the figure, the phytotoxicity of corn is reduced when haloxyfop-R-methyl is used in combination with imidazoline compared to haloxyfop-R-methyl alone.

[0049] Figure 2 In the bioassay example, the dosage of tebufenozide was 112.5 g ai / hm. 2 Used alone, and in combination with imidazole nicotinic acid at doses of 25, 37.5, and 50 g ai / hm. 2 The effects of mixed application on corn phytotoxicity 10 days after application are shown in the figure. As can be seen from the figure, the phytotoxicity of corn is reduced when haloxyfop-R-methyl is used in combination with imidazoline compared to haloxyfop-R-methyl alone.

[0050] Figure 3 In the bioassay example, the dosage of tebufenozide was 112.5 g ai / hm. 2 Used alone, and in combination with imidazole nicotinic acid at doses of 25, 37.5, and 50 g ai / hm. 2 The effects of mixed application on corn 14 days after application were observed. As shown in the figure, the phytotoxicity of corn was reduced when haloxyfop-R-methyl was used in combination with imidazoline compared to haloxyfop-R-methyl alone.

[0051] Figure 4 In the bioassay example, the dosage of oxadixyl was 150 g ai / hm. 2 Used alone, and in combination with imidazole nicotinic acid at doses of 25, 37.5, and 50 g ai / hm. 2 The effects of mixed application on corn phytotoxicity 7 days after application are shown in the figure. As can be seen from the figure, the phytotoxicity of corn is reduced when haloxyfop-R-methyl is used in combination with imidazoline compared to haloxyfop-R-methyl alone.

[0052] Figure 5 In the bioassay example, the dosage of oxadixyl was 150 g ai / hm. 2 Used alone, and in combination with imidazole nicotinic acid at doses of 25, 37.5, and 50 g ai / hm. 2 The effects of mixed application on corn phytotoxicity 10 days after application are shown in the figure. As can be seen from the figure, the phytotoxicity of corn is reduced when haloxyfop-R-methyl is used in combination with imidazoline compared to haloxyfop-R-methyl alone.

[0053] Figure 6 In the bioassay example, the dosage of oxadixyl was 150 g ai / hm. 2 Used alone, and in combination with imidazole nicotinic acid at doses of 25, 37.5, and 50 g ai / hm. 2 The effects of mixed application on corn phytotoxicity 14 days after application are shown in the figure. As can be seen from the figure, the phytotoxicity of corn is significantly reduced when haloxyfop-R-methyl is used in combination with imidazoline compared to haloxyfop-R-methyl alone. Detailed Implementation

[0054] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention. Where specific techniques or conditions are not specified in the examples, they should be performed according to the techniques or conditions described in the literature in this field, or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased from legitimate channels. Unless otherwise specified, all percentages in all examples of this invention refer to weight percentages.

[0055] (I) Formulation Examples

[0056] Formulation Example 1: 45% clopyralid·imidazolium acetonitrile emulsifiable concentrate

[0057] The composition includes 40.9% oxadiazine, 4.1% imidazole acetonic acid, 45% methanol, 5% calcium dodecylbenzenesulfonate, and 5% benzylphenol polyoxyethylene polyoxypropylene ether.

[0058] For example, the preparation method can be as follows: add oxadiazine technical, imidazole ethionate technical, calcium dodecylbenzenesulfonate, and benzylphenol polyoxyethylene polyoxypropylene ether to methanol in sequence under stirring, stir thoroughly to prepare a single-phase transparent liquid, and filter to remove impurities.

[0059] Formulation Example 2: 55% clopyralid·imidazolium acetonitrile emulsifiable concentrate

[0060] The composition includes 41.3% oxadiazine, 13.7% imidazole acetonic acid, 33% dimethyl sulfoxide, 6% calcium dodecylbenzenesulfonate, and 6% octylphenol polyoxyethylene ether.

[0061] For example, the preparation method can be as follows: under stirring, add oxadiazine technical, imidazole ethionate technical, calcium dodecylbenzenesulfonate and octylphenol polyoxyethylene ether to dimethyl sulfoxide in sequence, stir thoroughly to prepare a single-phase transparent liquid, and filter to remove impurities.

[0062] Formulation Example 3: 5% clopyralid·imidazolium acetonitrile microemulsion

[0063] 4.3% oxadiazine, 0.7% imidazole acetonic acid, 10% methanol, 5% styrene polyoxyethylene ether ammonium sulfate, 5% benzyl biphenol polyoxyethylene ether, 1% butyl glycidyl ether, 5% polyethylene glycol, and deionized water to make up the balance.

[0064] For example, the preparation method can be as follows: thoroughly mix oxadixyl technical, imidazole acetonic acid technical, methanol, styrene polyoxyethylene ether ammonium sulfate, benzyl biphenol polyoxyethylene ether, butyl glycidyl ether, and polyethylene glycol to form a uniform and transparent oil phase; slowly add deionized water under stirring to form a water-in-oil emulsion, then stir and heat to convert it into an oil-in-water emulsion, cool to room temperature, and then filter.

[0065] Formulation Example 4: 25% clopyralid·imidazolium acetonitrile microemulsion

[0066] 17.3% oxadiazine, 7.7% imidazole acetonic acid, 20% dimethyl sulfoxide, 7% magnesium dodecylbenzenesulfonate, 8% phenethylphenol polyoxyethylene polyoxypropylene ether, 1.5% 3-chloro-1,2-epoxypropane, 4% propylene glycol, and deionized water to make up the balance.

[0067] For example, the preparation method can be as follows: thoroughly mix oxadixyl technical, imidazole acetonic acid technical, dimethyl sulfoxide, magnesium dodecylbenzenesulfonate, phenethylphenol polyoxyethylene polyoxypropylene ether, 3-chloro-1,2-epoxypropane, and propylene glycol to form a uniform and transparent oil phase; slowly add deionized water under stirring to form a water-in-oil emulsion, then stir and heat to invert the phase to an oil-in-water emulsion, cool to room temperature, and then filter.

[0068] Formulation Example 5: 15% clopyralid·imidazolium acetonitrile water-dispersible granules

[0069] 12% oxadiazine, 3% imidazole acetonic acid, 30% silica, 1% fatty alcohol ethoxylate, 4% sodium dibutylnaphthalene sulfonate formaldehyde condensate, 4% polyoxyethylene polyoxypropylene ether block copolymer, 0.5% ethylene-vinyl acetate copolymer, 1% calcium chloride, 0.5% aerosol silica gel, 0.5% stearic acid, and bentonite to make up the balance.

[0070] First, the benzo[a]pyrene technical was uniformly adsorbed onto silica and dried. Then, the silica containing the adsorbed benzo[a]pyrene technical, imidazole acetonic acid technical, fatty alcohol ethoxylate, sodium dibutylnaphthalene sulfonate formaldehyde condensate, polyoxyethylene polyoxypropylene ether block copolymer, ethylene-vinyl acetate copolymer, calcium chloride, aerosol silica gel, and bentonite were added to water and ground. Stearic acid was then added under homogenization to obtain a slurry. The slurry was then spray-dried in a drying tower and sieved to obtain the final product.

[0071] Formulation Example 6: 35% oxadixyl·imidazolium acetic acid water-dispersible granules

[0072] 9.5% oxadiazine, 25.5% imidazole acetonic acid, 20% silica, 1% sodium octadecyl succinate, 5% alkylphenol polyoxyethylene ether formaldehyde condensate sulfate, 5% alkylphenol polyoxyethylene phosphate, 1% soluble starch, 2% thiamine, 1% aerosol silica, 0.5% lauric acid, and diatomaceous earth to make up the balance.

[0073] First, the technical grade of benzo[a]pyrene is uniformly adsorbed onto silica and dried. Then, silica containing the adsorbed benzo[a]pyrene, imidazole acetonic acid technical grade, sodium octadecyl succinate, alkylphenol polyoxyethylene ether formaldehyde condensate sulfate, alkylphenol polyoxyethylene phosphate, soluble starch, thiamine, aerosol silica gel, and diatomaceous earth are added to water and ground. Lauric acid is then added under homogenization to obtain a slurry. The slurry is then spray-dried in a drying tower and sieved to obtain the final product.

[0074] (II) Indoor Biometrics Example

[0075] The indoor bioassay examples of this invention were conducted according to the "Guidelines for Indoor Bioassay Testing of Pesticides - Herbicides Part 7: Determination of Combined Effects of Mixed Herbicides (NY / T 1155.7—2006)". Through indoor bioassays, the combined effects of two pesticides mixed in a certain proportion on crops and weeds were clarified. The test methods are as follows:

[0076] Accurately weigh 10.4167 g of 96% haloxyfop-R-methyl technical grade and dissolve it in 100 mL of acetone to prepare a haloxyfop-R-methyl stock solution with a concentration of 100 g / L. Accurately weigh 5.1020 g of 98% imidazoline technical grade and dissolve it in 100 mL of methanol to prepare an imidazoline imidazoline stock solution with a concentration of 50 g / L. During the experiment, take appropriate amounts of both the haloxyfop-R-methyl stock solution and the imidazoline imidazoline stock solution, and dilute them with an appropriate amount of 0.1% TWA80 aqueous solution to prepare the test solutions.

[0077] A pot experiment was conducted, with maize and the grassy weeds crabgrass and foxtail grass as the target species. Fourteen days after application, the fresh weight of maize plants and the fresh weight of the weeds were measured, and the actual phytotoxicity rate / control efficacy E for each treatment was calculated.

[0078]

[0079] In the formula: PT—fresh weight or plant height of the treatment group;

[0080] CK – Blank control group: fresh weight or plant height.

[0081] The Gowing method was used to evaluate the combined effect of two pesticides in a certain proportion on corn or weeds. The formula for calculating the theoretical phytotoxicity rate / control efficacy E0 after the combination is as follows:

[0082]

[0083] In the formula: X — phytotoxicity rate / control efficacy when herbicide A is applied at a dosage of P;

[0084] Y – Herbicide damage rate / control efficacy when herbicide B is applied at a dosage of Q;

[0085] E0 – The theoretical phytotoxicity rate / control efficacy after mixing herbicide A at dosage P and herbicide B at dosage Q;

[0086] E – Actual phytotoxicity / control efficacy after mixing herbicide A (at dosage P) and herbicide B (at dosage Q).

[0087] E-E0 > 10% indicates a synergistic effect; E-E0 < -10% indicates an antagonistic effect; -10% < E-E0 < 10% indicates an additive effect.

[0088] Indoor bioassay example 1:

[0089] The target crop was maize (variety Zhengdan 958). The dosage of each pesticide and its effect on maize fresh weight are shown in Table 1. The results showed that when the ratio of tebuconazole to imidazoline was in the range of 1:0.13-1.00, the E-E0 value was -79.2% to -10.5%, indicating that the mixture of the two pesticides in this range had a significant antagonistic effect on maize pesticide damage and could significantly reduce the impact on maize fresh weight. When the ratio of tebuconazole to imidazoline was in the range of 1:0.15-0.50, the E-E0 value was -79.2% to -16.1%, indicating that the antagonistic effect on maize pesticide damage was even more pronounced when the mixture of the two pesticides in this range.

[0090] Table 1. Effects of different ratios of oxadixyl and imidazonic acid on fresh weight of corn.

[0091]

[0092]

[0093] Table 2 shows the effects of different pesticide dosages and their influence on maize plant height. The results indicated that when the ratio of tebuconazole to imidacloprid was between 1:0.13 and 1.00, the E-E0 value ranged from -45.0% to -10.3%, indicating that the mixture of the two pesticides within this range had a significant antagonistic effect on maize herbicide damage and could significantly reduce the impact on maize plant height. When the ratio of tebuconazole to imidacloprid was between 1:0.15 and 0.50, the E-E0 value ranged from -45.0% to -11.8%, indicating that the antagonistic effect on maize herbicide damage was even more pronounced when the mixture of the two pesticides within this range.

[0094] Table 2 Effects of different ratios of oxadixyl and imidazoline on maize plant height

[0095]

[0096] Indoor bioassay example 2:

[0097] The target organism was *Digitaria rubra* (barbiturus). The dosage and efficacy of each treatment are shown in Table 3. Biochemical tests showed that when the ratio of tebuconazole to imidacloprid was between 1:0.13 and 1.00, the E-E0 value was 10.7%–15.9%, indicating that the mixture of the two in this range had a significant synergistic effect on *Digitaria rubra*. When the ratio of tebuconazole to imidacloprid was between 1:0.15 and 0.50, the E-E0 value was 13.1%–15.9%, indicating that the synergistic effect on *Digitaria rubra* was even more pronounced when the mixture was between 1:0.15 and 0.50.

[0098] Table 3. Bioassay results of different ratios of oxadixyl and imidazoline on Digitaria rubra.

[0099]

[0100]

[0101] Indoor bioassay example 3:

[0102] The target plant was *Setaria viridis*, and the dosage and efficacy of each treatment are shown in Table 4. Biochemical tests showed that when the ratio of tebuconazole to imidacloprid was in the range of 1:0.13-1.00, the E-E0 value was 10.5%-18.8%, indicating that the mixture of the two in this range had a significant synergistic effect on *Setaria viridis*. When the ratio of tebuconazole to imidacloprid was in the range of 1:0.15-0.50, the E-E0 value was 12.5%-18.8%, indicating that the synergistic effect on *Setaria viridis* was even more pronounced when the mixture of the two in this range.

[0103] Table 4. Results of bioassays on *Setaria viridis* with different ratios of oxadiazine and imidazoline.

[0104]

[0105] (III) Examples of Field Efficacy Trials

[0106] The field efficacy test examples of this invention were conducted in accordance with the "Guidelines for Field Efficacy Tests of Pesticides (I) Herbicides for the Control of Weeds in Corn Fields (GB / T17980.42-2000)". Field plot trials were conducted to verify the results of the indoor bioassay tests and to clarify the effect of the two agents, when combined in a certain proportion, on reducing phytotoxicity to corn and their field control effect on weeds. The test methods are as follows:

[0107] In soybean-corn intercropping fields, spray the stems and leaves of corn when it is at the 3-5 leaf stage and weeds when they are at the 2-4 leaf stage, with a solution volume of 450 L / hm². 2 Each treatment was repeated four times, with a plot size of 50 m², arranged in a randomized block design. A survey was conducted 30 days post-treatment. Four sampling points were randomly selected from the corn-growing area in each plot. The aboveground fresh weight of corn or weeds was measured at each sampling point. Ten consecutive corn plants were sampled at each sampling point, and 1 m² of weeds were sampled at each sampling point. 2 Calculate the actual phytotoxicity rate / control efficacy E for each treatment:

[0108]

[0109] In the formula: PT—fresh weight of corn / weeds in the treated area;

[0110] CK – Fresh weight of corn / weeds in the blank control area.

[0111] The data obtained from the survey, referencing the "Guidelines for Indoor Bioassay Testing of Pesticides - Herbicides Part 7: Determination of Combined Effects of Mixed Herbicides (NY / T1155.7—2006)," used the Gowing method to evaluate the combined effects of two herbicides mixed in a certain proportion on corn or weeds. The formula for calculating the theoretical phytotoxicity rate / control efficacy E0 after mixing is as follows:

[0112]

[0113] In the formula: X — phytotoxicity rate / control efficacy when herbicide A is applied at a dosage of P;

[0114] Y – Herbicide damage rate / control efficacy when herbicide B is applied at a dosage of Q;

[0115] E0 – The theoretical phytotoxicity rate / control efficacy after mixing herbicide A at dosage P and herbicide B at dosage Q;

[0116] E – Actual phytotoxicity / control efficacy after mixing herbicide A (at dosage P) and herbicide B (at dosage Q).

[0117] E-E0 > 10% indicates a synergistic effect; E-E0 < -10% indicates an antagonistic effect; -10% < E-E0 < 10% indicates an additive effect.

[0118] The experiment was conducted in Shijiazuo Village, Gaoyang County, Baoding City, Hebei Province. The maize variety was Zhengdan 958. The main weeds in the field were crabgrass, foxtail grass, and barnyard grass, which were evenly distributed.

[0119] Table 5 shows the dosage of each pesticide and the phytotoxicity rate to corn. Field trial results showed that the optimal dosage of tebuconazole (112.5 g / hm²) was [not specified]. 2 The phytotoxicity rate of tebufenozide single agent on corn was 74.2%, while the phytotoxicity rate of the composition described in this invention was 43.4%, with an E-E0 value of -35.5%; the effective dosage of tebufenozide was 150 g / hm². 2 The phytotoxicity rate of haloxyfop-R-methyl in corn was 91.5%, while the phytotoxicity rate of the composition described in this invention in wheat was 46.2%–61.3%, with an E-E0 value of -46.9%–-30.5%. Compared with haloxyfop-R-methyl alone, the phytotoxicity rate of the haloxyfop-R-methyl and imidazoline composition of this invention significantly reduces the phytotoxicity rate in corn under the same dosage of haloxyfop-R-methyl, indicating that in practical applications, the composition of this invention has a significant antagonistic effect on phytotoxicity in corn and can significantly reduce the phytotoxicity caused by haloxyfop-R-methyl alone.

[0120] Table 5. Results of field trials on herbicide damage to corn caused by the combined use of tebufenozide and imidazoline.

[0121]

[0122] Table 6 shows the dosage of each treatment agent and its weed control efficacy. Field efficacy tests showed that the E-E0 value of the combination of tebuconazole and imidazoline described in this invention was 11.2% to 15.8% for overall control of barnyardgrass, foxtail, and millet, indicating that the composition described in this invention has a significant synergistic effect on weeds in practical applications.

[0123] Table 6. Results of field efficacy trials of the combined use of tebuconazole and imidazoline for controlling grassy weeds in maize fields.

[0124]

[0125] This invention has been described through specific embodiments. Those skilled in the art can refer to the content of this invention and appropriately modify the raw materials, process conditions, and other aspects to achieve other corresponding objectives. Such modifications do not depart from the content of this invention, and all similar substitutions and alterations are considered to be included within the scope of this invention, as they do not depart from the spirit of this invention.

Claims

1. A herbicide method for reducing the phytotoxicity of clethodim to gramineous crops, characterized in that, The mixture of oxadiazine and imidazoline is used in a weight ratio of 1:0.10-3.

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2. The weeding method according to claim 1, characterized in that, The weight ratio of oxadixyl and imidazoline is 1:0.13-1.

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3. The weeding method according to claim 1, characterized in that, The gramineous crops include any one or more of maize, rice, wheat, millet, and sorghum.

4. The weeding method according to claim 1, characterized in that, The compound of oxadixyl and imidazoline is used for weed control in fields where grasses and broadleaf crops are intercropped.

5. The weeding method according to claim 4, characterized in that, The broadleaf crops include any one or more of soybeans, peanuts, cotton, potatoes, and rapeseed.

6. The weeding method according to claim 1, characterized in that, The target weeds include grassy weeds, preferably including crabgrass and foxtail.

7. The weeding method according to any one of claims 1-6, characterized in that, A herbicide was prepared by combining haloxyfop-R-methyl and imidazoline for weed control, wherein the total effective ingredient dosage of haloxyfop-R-methyl and imidazoline was 50-300 g / hm². 2 .

8. A herbicide specifically for intercropping fields of gramineous crops and broadleaf crops, characterized in that, The herbicide comprises clopyralid and imidazoline, wherein the weight ratio of clopyralid to imidazoline is 1:0.10-3.

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9. The herbicide according to claim 8, characterized in that, The herbicide contains 1%-90% of the total weight of oxadixyl and imidazoline, preferably 5%-60%.

10. The herbicide according to claim 8, characterized in that, The formulation of the herbicide is selected from any one of emulsifiable concentrates, microemulsions, water-dispersible granules, suspension emulsions, water-in-oil emulsions, oil suspensions, suspensions, wettable powders, soluble powders, dry suspensions, aqueous solutions, oils, and microcapsule suspensions.

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