Herbicide for spraying stems and leaves in sunflower field

Abstract

A herbicide for spraying stems and leaves in a sunflower field belongs to the field of herbicides and comprises the following components in percentage by mass: 5-10% of tembotrions, 12-16% of haloxyfop-R-methyl coating, 0.6-1.0% of a thickening agent, 0.4-0.6% of a defoaming agent and the balance of water. The herbicide for spraying the stems and the leaves of the sunflower field, prepared by the invention, realizes the effect that efficient haloxyfop-R-methyl and tembotrions coexist and can better play a role in an alkaline environment.

Description

Technical Field

[0001] The invention belongs to the field of herbicides, and in particular relates to a herbicide for spraying stems and leaves in sunflower fields. Background Art

[0002] In sunflower cultivation, weed damage is one of the important factors affecting fruit yield and quality. The main weed species in sunflower fields include broadleaf weeds such as Solanum nigrum and Amaranthus chinensis, and grass weeds such as Imperata cylindrica and Bermuda grass.

[0003] Sunflowers are sensitive to herbicides to a certain extent, and the herbicides commonly used in the cultivation of sunflowers are generally selective herbicides. In the prior art, the highly effective flupyralid has excellent control effects on grass weeds such as Imperata cylindrica and Cynodon dactylon, but is not effective against non-grass weeds such as Solanum nigrum. Cyclosulfuron is a new type of herbicide that is particularly effective against broad-leaved weeds such as Solanum nigrum and Amaranthus tricolor. Therefore, it is possible to consider mixing highly effective flupyralid and cyclosulfuron. Studies have found that highly effective flupyralid and cyclosulfuron are not compatible in liquid environments, mainly because cyclosulfuron has a high solubility and stability in an alkaline environment; and the chemical structure of highly effective flupyralid changes in an alkaline environment, thereby affecting its biological activity, stability and efficacy. In addition, highly effective flupyralid is almost insoluble in water and requires the use of an organic solvent to prepare a sprayable solution in order to better exert its weed control effect.

[0004] Therefore, in an alkaline liquid environment, how to make the highly effective flupyralid and cypermethrin compatible with each other to achieve the maximum weed control effect is an issue that we urgently need to solve. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In view of the deficiencies of the prior art, the present invention provides a herbicide for spraying the stems and leaves of sunflower fields.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A herbicide for spraying on stems and leaves of sunflower fields comprises the following components, calculated by mass percentage: 5-10% of tembotrione, 12-16% of a high-efficiency haloxyfop-p-ethyl coating, 0.6-1.0% of a thickener, 0.4-0.6% of a defoamer, and the balance is water.

[0010] Furthermore, the preparation of the highly effective haloxyfop-ethyl coating comprises the following steps:

[0011] S1. In parts by weight, 4 to 5 parts of hexamethylene diisocyanate were added to 1 part of the highly efficient haloxyfop-ethyl mixture, stirred and then added 0.1 to 0.2 parts of cellulose nanocrystals and homogenized to obtain a highly efficient haloxyfop-ethyl emulsion;

[0012] S2. Slowly add 1.5 to 2 parts of ethylenediamine by weight to the high-efficiency haloxyfop-butyl emulsion prepared in S1 and react at room temperature for 1 to 2 hours. After the reaction is completed, an oil-in-water film liquid is obtained, which is filtered to obtain a hydrophilic high-efficiency haloxyfop-butyl coated material.

[0013] Furthermore, the high-efficiency haloxyfop-ethyl mixed solution is prepared by mixing high-efficiency haloxyfop-ethyl and an oil phase in a mass ratio of 1:1.

[0014] Furthermore, the oil phase is a mixture of corn oil and acetone in a mass ratio of 1:2 to 3.

[0015] Furthermore, the thickener is one or more of carboxymethyl cellulose, methyl cellulose, and hydroxyethyl cellulose.

[0016] Furthermore, the defoaming agent is selected from polysilicone defoaming agents and / or polyether defoaming agents.

[0017] A method for preparing a herbicide for spraying on stems and leaves of sunflower fields comprises the following steps:

[0018] Q1. Weigh the raw materials according to the mass percentage, then add half of the water to the highly effective haloxyfop-ethyl coated material, add a thickener, and stir to obtain a solution;

[0019] Q2. Add ammonia to the remaining water to adjust the pH to 8-10, add tembotrione, and stir to obtain Solution 2;

[0020] Q3. Slowly add the solution prepared in Q1 to the solution prepared in Q2, add a defoamer, adjust the pH to 8-10 with ammonia water, and stir evenly to obtain the herbicide for spraying the stems and leaves of sunflower fields.

[0021] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0022] 1. The coating obtained by treating the highly effective haloxyfop-ethyl with the present invention can protect the drug separately, prevent the alkaline environment from affecting it, and avoid the deterioration of the active ingredient. In addition, the coating has good hydrophilicity, which can ensure the uniformity of drug dispersion.

[0023] 2. The present invention provides a composite herbicide that utilizes a water-soluble system. Compared to solvent-based herbicides, the active ingredients in the compound are less volatile, resulting in less impact on the environment and human health. Furthermore, the active ingredients are slowly released from the coating, providing a sustained-release effect and extending the duration of action. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, rather than all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] A herbicide for spraying on stems and leaves of sunflower fields comprises the following components, calculated by mass percentage: 7% of tembotrione, 14% of a high-efficiency haloxyfop-ethyl coating, 0.8% of a thickener, 0.5% of a defoaming agent, and the balance being water.

[0027] The thickener is carboxymethyl cellulose.

[0028] The defoaming agent is selected from polysilicone defoaming agents.

[0029] The preparation of the highly effective haloxyfop-ethyl coated material comprises the following steps:

[0030] S1. By weight, 4 parts of hexamethylene diisocyanate were added to 1 part of a high-efficiency haloxyfop-ethyl mixed solution, and after stirring evenly, 0.15 parts of cellulose nanocrystals were added and homogenized to obtain a high-efficiency haloxyfop-ethyl emulsion. The high-efficiency haloxyfop-ethyl mixed solution is formed by mixing high-efficiency haloxyfop-ethyl with an oil phase in a mass ratio of 1:1, and the oil phase is a mixture of corn oil and acetone in a mass ratio of 1:2.5.

[0031] S2. Slowly add 1.8 parts of ethylenediamine by weight to the high-efficiency haloxyfop-butyl emulsion prepared in S1 and react at room temperature for 1 hour. After the reaction is completed, an oil-in-water film liquid is obtained, which is filtered to obtain a hydrophilic high-efficiency haloxyfop-butyl coated material.

[0032] Then, a herbicide for spraying the stems and leaves of sunflower fields is prepared by the following method:

[0033] Q1. Weigh the raw materials according to the mass percentage, then add half of the water to the highly effective haloxyfop-ethyl coated material, add a thickener, and stir to obtain a solution;

[0034] Q2. Add ammonia to the remaining water to adjust the pH to 9, add tembotrione, and stir to obtain solution 2;

[0035] Q3. Slowly add the solution prepared in Q1 to the solution prepared in Q2, add a defoamer, adjust the pH to 9 with ammonia water, and stir evenly to obtain the herbicide for spraying the stems and leaves of sunflower fields.

[0036] Example 2

[0037] A herbicide for spraying on stems and leaves of sunflower fields, comprising the following components, calculated by mass percentage: 5% of tembotrione, 12% of a high-efficiency haloxyfop-ethyl coating, 0.6% of a thickener, 0.4% of a defoamer, and the balance being water;

[0038] The thickener is methylcellulose.

[0039] The defoaming agent is selected from polysilicone defoaming agents.

[0040] The preparation of the highly effective haloxyfop-ethyl coated material comprises the following steps:

[0041] S1. Add 4 parts of hexamethylene diisocyanate to 1 part of a high-efficiency haloxyfop-ethyl mixed solution by weight, stir evenly, add 0.1 parts of cellulose nanocrystals, and homogenize to obtain a high-efficiency haloxyfop-ethyl emulsion. The high-efficiency haloxyfop-ethyl mixed solution is prepared by mixing high-efficiency haloxyfop-ethyl with an oil phase in a mass ratio of 1:1, and the oil phase is a mixture of corn oil and acetone in a mass ratio of 1:2.

[0042] S2. Slowly add 1.5 parts of ethylenediamine by weight to the high-efficiency haloxyfop-butyl emulsion prepared in S1 and react at room temperature for 1 hour. After the reaction is completed, an oil-in-water film liquid is obtained, which is filtered to obtain a hydrophilic high-efficiency haloxyfop-butyl coated material.

[0043] Then, a herbicide for spraying the stems and leaves of sunflower fields is prepared by the following method:

[0044] Q1. Weigh the raw materials according to the mass percentage, then add half of the water to the highly effective haloxyfop-ethyl coated material, add a thickener, and stir to obtain a solution;

[0045] Q2. Add ammonia to the remaining water to adjust the pH to 8, add cyclohexane and stir to obtain solution 2;

[0046] Q3. Slowly add the solution prepared in Q1 to the solution prepared in Q2, add a defoamer, adjust the pH to 8 with ammonia water, and stir evenly to obtain the herbicide for spraying the stems and leaves of sunflower fields.

[0047] Example 3

[0048] A herbicide for spraying on stems and leaves of sunflower fields comprises the following components, calculated by mass percentage: 10% of tembotrione, 16% of a high-efficiency haloxyfop-ethyl coating, 1.0% of a thickener, 0.6% of a defoaming agent, and the balance being water.

[0049] The thickener is hydroxyethyl cellulose.

[0050] The defoaming agent is selected from polyether defoaming agents.

[0051] The preparation of the highly effective haloxyfop-ethyl coated material comprises the following steps:

[0052] S1. Add 5 parts of hexamethylene diisocyanate to 1 part of a high-efficiency haloxyfop-ethyl mixed solution by weight, stir evenly, add 0.2 parts of cellulose nanocrystals, and homogenize to obtain a high-efficiency haloxyfop-ethyl emulsion. The high-efficiency haloxyfop-ethyl mixed solution is prepared by mixing high-efficiency haloxyfop-ethyl with an oil phase in a mass ratio of 1:1, and the oil phase is a mixture of corn oil and acetone in a mass ratio of 1:3.

[0053] S2. Slowly add 2 parts of ethylenediamine by weight to the high-efficiency haloxyfop-butyl emulsion prepared in S1 and react at room temperature for 2 hours. After the reaction is completed, an oil-in-water film liquid is obtained, which is filtered to obtain a hydrophilic high-efficiency haloxyfop-butyl coated material.

[0054] Then, a herbicide for spraying the stems and leaves of sunflower fields is prepared by the following method:

[0055] Q1. Weigh the raw materials according to the mass percentage, then add half of the water to the highly effective haloxyfop-ethyl coated material, add a thickener, and stir to obtain a solution;

[0056] Q2. Ammonia was added to the remaining water to adjust the pH to 10, tembotrione was added, and the mixture was stirred to obtain solution 2;

[0057] Q3. Slowly add the solution prepared in Q1 to the solution prepared in Q2, add a defoamer, adjust the pH to 10 with ammonia water, and stir evenly to obtain the herbicide for spraying the stems and leaves of sunflower fields.

[0058] Example 4

[0059] A herbicide for spraying on stems and leaves of sunflower fields, comprising the following components, calculated by mass percentage: 6% of tembotrione, 13% of a high-efficiency haloxyfop-ethyl coating, 0.7% of a thickener, 0.45% of a defoaming agent, and the balance being water;

[0060] The thickener is a mixture of carboxymethyl cellulose and methyl cellulose in a mass ratio of 1:1.

[0061] The defoaming agent is selected from polysilicone defoaming agents.

[0062] The preparation of the highly effective haloxyfop-ethyl coated material comprises the following steps:

[0063] S1. By weight, 4.3 parts of hexamethylene diisocyanate were added to 1 part of a high-efficiency haloxyfop-ethyl mixed solution, and after stirring evenly, 0.13 parts of cellulose nanocrystals were added and homogenized to obtain a high-efficiency haloxyfop-ethyl emulsion. The high-efficiency haloxyfop-ethyl mixed solution is formed by mixing high-efficiency haloxyfop-ethyl with an oil phase in a mass ratio of 1:1, and the oil phase is a mixture of corn oil and acetone in a mass ratio of 1:2.2.

[0064] S2. Slowly add 1.6 parts of ethylenediamine by weight to the high-efficiency haloxyfop-butyl emulsion prepared in S1 and react at room temperature for 1.3 hours. After the reaction is completed, an oil-in-water film liquid is obtained, which is filtered to obtain a hydrophilic high-efficiency haloxyfop-butyl coated material.

[0065] Then, a herbicide for spraying the stems and leaves of sunflower fields is prepared by the following method:

[0066] Q1. Weigh the raw materials according to the mass percentage, then add half of the water to the highly effective haloxyfop-ethyl coated material, add a thickener, and stir to obtain a solution;

[0067] Q2. Add ammonia to the remaining water to adjust the pH to 8, add cyclohexane and stir to obtain solution 2;

[0068] Q3. Slowly add the solution prepared in Q1 to the solution prepared in Q2, add a defoamer, adjust the pH to 8 with ammonia water, and stir evenly to obtain the herbicide for spraying the stems and leaves of sunflower fields.

[0069] Example 5

[0070] A herbicide for spraying on stems and leaves of sunflower fields comprises the following components, calculated by mass percentage: 9% of tembotrione, 15% of a high-efficiency haloxyfop-ethyl coating, 0.9% of a thickener, 0.55% of a defoamer, and the balance being water.

[0071] The thickener is a mixture of carboxymethyl cellulose, methyl cellulose and hydroxyethyl cellulose in a mass ratio of 1:1:1.

[0072] The defoaming agent is selected from a mixture of a polysilicone defoaming agent and a polyether defoaming agent in a mass ratio of 1:1.

[0073] The preparation of the highly effective haloxyfop-ethyl coated material comprises the following steps:

[0074] S1. By weight, 4.8 parts of hexamethylene diisocyanate were added to 1 part of a high-efficiency haloxyfop-ethyl mixed solution, and after stirring evenly, 0.18 parts of cellulose nanocrystals were added and homogenized to obtain a high-efficiency haloxyfop-ethyl emulsion. The high-efficiency haloxyfop-ethyl mixed solution is formed by mixing high-efficiency haloxyfop-ethyl with an oil phase in a mass ratio of 1:1, and the oil phase is a mixture of corn oil and acetone in a mass ratio of 1:2.7.

[0075] S2. Slowly add 1.8 parts of ethylenediamine by weight to the high-efficiency haloxyfop-butyl emulsion prepared in S1 and react at room temperature for 1.8 hours. After the reaction is completed, an oil-in-water film liquid is obtained, which is filtered to obtain a hydrophilic high-efficiency haloxyfop-butyl coated material.

[0076] Then, a herbicide for spraying the stems and leaves of sunflower fields is prepared by the following method:

[0077] Q1. Weigh the raw materials according to the mass percentage, then add half of the water to the highly effective haloxyfop-ethyl coated material, add a thickener, and stir to obtain a solution;

[0078] Q2. Ammonia was added to the remaining water to adjust the pH to 10, tembotrione was added, and the mixture was stirred to obtain solution 2;

[0079] Q3. Slowly add the solution prepared in Q1 to the solution prepared in Q2, add a defoamer, adjust the pH to 10 with ammonia water, and stir evenly to obtain the herbicide for spraying the stems and leaves of sunflower fields.

[0080] Comparative Example 1

[0081] The difference from Example 1 is that the highly effective haloxyfop-ethyl coating is not added in the preparation of the herbicide for spraying the stems and leaves of sunflower fields.

[0082] A herbicide for spraying on stems and leaves of sunflower fields comprises the following components, calculated by mass percentage: 7% of tembotrione, 0.8% of a thickener, 0.5% of a defoamer, and the balance being water.

[0083] A herbicide for spraying stems and leaves in sunflower fields is prepared by the following method:

[0084] Q1. Add ammonia to water to adjust the pH to 9, add tembotrione, and stir to obtain solution 2;

[0085] Q2. Take solution 2 prepared in Q1, add a defoamer, adjust the pH to 9 with ammonia water, and stir evenly to obtain the herbicide for spraying the stems and leaves of sunflower fields.

[0086] Comparative Example 2

[0087] The difference from Example 1 is that, in the preparation of the herbicide for spraying the stems and leaves of sunflower fields, the highly effective haloxyfop-ethyl is not coated.

[0088] The preparation of high-efficiency haloxyfop-ethyl emulsion comprises the following steps:

[0089] By weight, 4 parts of hexamethylene diisocyanate were added to 1 part of a high-efficiency haloxyfop-ethyl mixed solution, the mixture was stirred evenly, and 0.15 parts of cellulose nanocrystals were added, and the mixture was homogenized to obtain a high-efficiency haloxyfop-ethyl emulsion. The high-efficiency haloxyfop-ethyl mixed solution was prepared by mixing high-efficiency haloxyfop-ethyl with an oil phase in a mass ratio of 1:1, and the oil phase was a mixture of corn oil and acetone in a mass ratio of 1:2.5.

[0090] A herbicide for spraying stems and leaves in sunflower fields is prepared by the following method:

[0091] Q1. Weigh the raw materials according to the mass percentage, then add half of the water to the highly effective haloxyfop-ethyl emulsion, add a thickener, and stir to obtain a solution;

[0092] Q2. Add ammonia to the remaining water to adjust the pH to 9, add tembotrione, and stir to obtain solution 2;

[0093] Q3. Slowly add the solution prepared in Q1 to the solution prepared in Q2, add a defoamer, adjust the pH to 9 with ammonia water, and stir evenly to obtain the herbicide for spraying the stems and leaves of sunflower fields.

[0094] Comparative Example 3

[0095] The difference from Example 1 is that the pH of the prepared herbicide for spraying on the stems and leaves of sunflower fields is neutral.

[0096] A herbicide for spraying stems and leaves in sunflower fields is prepared by the following method:

[0097] Q1. Weigh the raw materials according to the mass percentage, then add half of the water to the highly effective haloxyfop-ethyl coated material, add a thickener, and stir to obtain a solution;

[0098] Q2. Add ammonia to the remaining water to adjust the pH to 9, add tembotrione, and stir to obtain solution 2;

[0099] Q3. Slowly add the solution prepared in Q1 to the solution prepared in Q2, add a defoamer, adjust the pH to 7, and stir evenly to obtain the herbicide for spraying the stems and leaves of sunflower fields.

[0100] Comparative Example 4

[0101] The difference from Example 1 is that in the preparation of the herbicide for spraying the stems and leaves of sunflower fields, the highly effective fluazifop-ethyl is not coated, and the pH of the prepared herbicide for spraying the stems and leaves of sunflower fields is neutral.

[0102] The preparation of high-efficiency haloxyfop-ethyl emulsion comprises the following steps:

[0103] By weight, 4 parts of hexamethylene diisocyanate were added to 1 part of a high-efficiency haloxyfop-ethyl mixed solution, the mixture was stirred evenly, and 0.15 parts of cellulose nanocrystals were added, and the mixture was homogenized to obtain a high-efficiency haloxyfop-ethyl emulsion. The high-efficiency haloxyfop-ethyl mixed solution was prepared by mixing high-efficiency haloxyfop-ethyl with an oil phase in a mass ratio of 1:1, and the oil phase was a mixture of corn oil and acetone in a mass ratio of 1:2.5.

[0104] A herbicide for spraying stems and leaves in sunflower fields is prepared by the following method:

[0105] Q1. Weigh the raw materials according to the mass percentage, then add half of the water to the highly effective haloxyfop-ethyl emulsion, add a thickener, and stir to obtain a solution;

[0106] Q2. Add ammonia to the remaining water to adjust the pH to 9, add tembotrione, and stir to obtain solution 2;

[0107] Q3. Slowly add the solution prepared in Q1 to the solution prepared in Q2, add a defoamer, adjust the pH to 7, and stir evenly to obtain the herbicide for spraying the stems and leaves of sunflower fields.

[0108] Proven effectiveness

[0109] After sunflower seedlings emerge, weeds are applied when they are 3 to 5 leaves. 30 ml of the herbicides obtained in the examples and comparative examples are added to 20 kg of water, stirred evenly, and then sprayed evenly. The spraying amount is 50 g / m 2 .

[0110] With reference to GB / T17980.51-2000 Guidelines for Field Efficacy Tests (I) Herbicides for Control of Weeds in Non-arable Land, efficacy tests were conducted on the herbicides obtained in the Examples and Comparative Examples. The efficacy was calculated according to the following formula: Control Effect (%) = [1-(CK-PT) / PT]*100, where: PT = the number of remaining weeds in the treatment area; CK = the number of living weeds in the blank control area. Table 1 shows the specific results of the field efficacy tests 15 days after application:

[0111] Table 1

[0112]

[0113]

[0114] Result analysis:

[0115] Combining the contents of Examples 1 to 5 and the contents of Table 1, it can be seen that the herbicide prepared by the present invention for spraying on the stems and leaves of sunflower fields has good control effects on Solanum nigrum, Amaranthus chinensis, Imperata cylindrica and Bermuda grass.

[0116] Combined with the content of Comparative Example 1 and the data in Table 1, no high-efficiency fluazifop-ethyl coating was added in Comparative Example 1. The herbicide for sunflower field stem and leaf spraying prepared in Comparative Example 1 has little effect on Solanum nigrum and Amaranthus dactylon, but compared with the inhibitory effect of the herbicide for sunflower field stem and leaf spraying prepared in Example 1 on Imperata cylindrica and Bermuda grass, the inhibitory effect of the herbicide for sunflower field stem and leaf spraying prepared in Comparative Example 1 on the growth of Imperata cylindrica and Bermuda grass is significantly reduced. It shows that in the preparation of the herbicide for sunflower field stem and leaf spraying, the addition of the high-efficiency fluazifop-ethyl coating can effectively improve the weeding effect of the herbicide for sunflower field stem and leaf spraying on Imperata cylindrica and Bermuda grass. At the same time, because Comparative Example 1 only contains tembotrione, the above-mentioned proof that tembotrione only has a control effect on weeds such as Solanum nigrum and Amaranthus dactylon, the control effect on Imperata cylindrica and Bermuda grass is not obvious.

[0117] Combining the content of Comparative Example 2 and the data in Table 1, and comparing the control effects of the herbicide prepared in Example 1 on the growth of the four weeds in the table, the control effects of the herbicide prepared in Comparative Example 2 on Imperata cylindrica and Bermuda grass were significantly weaker than those of the herbicide prepared in Example 1. This demonstrates that the addition of ethylenediamine to form a coating in the preparation of the highly efficient flupyralid coating can improve the control effects of the final herbicide prepared for sunflower field stem and leaf spray on Imperata cylindrica and Bermuda grass.

[0118] The pH of the herbicide prepared in Comparative Example 3 for foliar spraying in sunflower fields was neutral, and the control efficacy against Solanum nigrum and Amaranthus chinensis (Table 1) was significantly reduced. This demonstrates that pH adjustment of the herbicide for foliar spraying in sunflower fields affects the herbicidal efficacy of the prepared herbicide for foliar spraying in sunflower fields.

[0119] Comparative Example 4 is a herbicide for spraying on the stems and leaves of sunflower fields prepared by adjusting the pH value to neutral on the basis of Comparative Example 2. As a result, compared with the control effect of the herbicide for spraying on the stems and leaves of sunflower fields prepared in Example 1 on the four weeds, the control effect of the herbicide for spraying on the stems and leaves of sunflower fields prepared in Comparative Example 4 on the four weeds is significantly reduced. Combining Comparative Examples 1, 2 and 3, it can be seen that in an alkaline environment, the coating of high-efficiency flupyrazole can coexist with tembotrione in a unified system, and can work together to remove weeds.

[0120] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A herbicide for spraying on the stems and leaves of sunflower fields, characterized by: The invention comprises the following components in percentage by mass: 5-10% of tembotrione, 12-16% of high-efficiency haloxyfop-p-ethyl coating, 0.6-1.0% of thickener, 0.4-0.6% of defoamer, and the balance is water.

2. The herbicide for spraying on stems and leaves of sunflower fields according to claim 1, characterized in that: The preparation of the high-efficiency haloxyfop-ethyl coated material comprises the following steps: S1. In parts by weight, 4 to 5 parts of hexamethylene diisocyanate were added to 1 part of the highly efficient haloxyfop-ethyl mixture, stirred and then added 0.1 to 0.2 parts of cellulose nanocrystals, homogenized to obtain a highly efficient haloxyfop-ethyl emulsion; S2. Slowly add 1.5 to 2 parts of ethylenediamine by weight to the high-efficiency haloxyfop-butyl emulsion prepared in S1 and react at room temperature for 1 to 2 hours. After the reaction is completed, an oil-in-water film liquid is obtained, which is filtered to obtain a high-efficiency haloxyfop-butyl coated material.

3. The herbicide for spraying on stems and leaves of sunflower fields according to claim 2, characterized in that: The high-efficiency haloxyfop-ethyl mixed solution is prepared by mixing high-efficiency haloxyfop-ethyl and an oil phase in a mass ratio of 1:

1.

4. The herbicide for spraying on stems and leaves of sunflower fields according to claim 3, characterized in that: The oil phase is a mixture of corn oil and acetone in a mass ratio of 1:2 to 3.

5. The herbicide for spraying on stems and leaves of sunflower fields according to claim 1, characterized in that: The thickener is one or more of carboxymethyl cellulose, methyl cellulose and hydroxyethyl cellulose.

6. The herbicide for spraying on stems and leaves of sunflower fields according to claim 1, characterized in that: The defoaming agent includes a polysilicone defoaming agent and / or a polyether defoaming agent.

7. The herbicide for spraying on stems and leaves of sunflower fields according to any one of claims 1 to 6, characterized in that: The preparation method of the herbicide for spraying the stems and leaves of sunflower fields is as follows: Q1. Weigh the raw materials according to the mass percentage, then add half of the water to the highly effective haloxyfop-ethyl coated material, add a thickener, and stir to obtain a solution; Q2. Add ammonia to the remaining water to adjust the pH to 8-10, add tembotrione, and stir to obtain Solution 2; Q3. Slowly add the solution prepared in Q1 to the solution prepared in Q2, add a defoamer, adjust the pH to 8-10 with ammonia water, and stir evenly to obtain the herbicide for spraying the stems and leaves of sunflower fields.

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