Film-forming agent for tobacco bud inhibition as well as preparation method and application of film-forming agent

Abstract

The invention discloses a film-forming agent for tobacco bud inhibition as well as a preparation method and application thereof, and the method is characterized in that a hydrophilic monomer compound and a hydrophobic monomer compound are physically mixed by utilizing an emulsion physical blending method, so that a blended film-forming agent with rain wash resistance is obtained. The film-forming agent is added into the tobacco suckercide, so that the effective components in the tobacco suckercide are not influenced by rainwater, illumination and other factors and are slowly released, the lasting period of the effective components is prolonged, the hydrophilic monomer compound is polyvinyl alcohol, and the hydrophobic monomer compounds are polyvinyl acetate and polypropylene carbonate. The film-forming agent prepared by the method disclosed by the invention has the advantages of good film-forming property, high film-forming uniformity, good wetting effect and high biological activity, and the effects of prolonging the pesticide effect and ensuring the growth safety of tobacco are achieved. The film-forming agent has good water resistance, and is especially suitable for weather with too much rainwater in spring. When the tobacco bud inhibitor is added into the tobacco bud inhibitor, the bud inhibition rate is increased by 36.09% when the tobacco bud inhibitor is used under continuous cloudy and rainy conditions.

Description

Technical Field

[0001] The invention relates to a tobacco planting technology, in particular to a film-forming agent for tobacco bud inhibition and a preparation method and application thereof. Background Art

[0002] In the late stage of tobacco plant growth, timely topping and bud inhibitors must be used to prevent a large amount of nutrients in tobacco leaves from flowing to reproductive organs after budding. Using chemical bud inhibitors to inhibit the growth of tobacco buds is an important technical measure to improve tobacco yield and quality, and plays a very important role in high-quality and suitable production. The effect of the bud inhibitors on the prevention and control of tobacco axillary buds directly affects the yield and quality of tobacco leaves. By applying chemical bud inhibitors in flue-cured tobacco production, the growth of tobacco buds during tobacco growth can be effectively inhibited, so that tobacco farmers are no longer troubled by tobacco branches, a large amount of labor for manual branching can be reduced, and the labor efficiency of tobacco farmers can be improved. However, in the main planting areas in southern China, such as Yunnan, Guizhou, Hunan, Sichuan and other regions, tobacco plants enter the rainy season in the south after topping and bud inhibition. There is more rain for a period of time. The bud inhibitors used in existing production are easily washed off by rain, resulting in unsatisfactory bud inhibition effects. About 20 days after the bud inhibition, tobacco buds (forks) begin to grow, which seriously affects the accumulation of dry matter and yield and quality of tobacco leaves. Some of them also need to add bud inhibitors, which increases the cost of medication and labor. Therefore, it is urgent to develop highly effective and rain-resistant tobacco bud inhibitor technology.

[0003] Adding film-forming agents to bud inhibitors can firmly attach the active ingredients to the surface of tobacco, which is the key to reducing the loss of active ingredients by rain erosion, and slowly releasing the active ingredients, extending the effective period of the active ingredients. However, there are no film-forming agent products on the market that are specifically designed to prevent rain erosion. Existing film-forming agent products are mainly sodium alginate, chitosan, etc. These materials are easily soluble in water, and the active ingredients are difficult to maintain under the erosion of rain, thus affecting biological activity. Therefore, not all film-forming agents are suitable for use in the rainy season in the south. Film-forming agents used in water environments need to have excellent water resistance and environmental compatibility as well as excellent film-forming and sustained-release properties. This is the key to obtaining efficient, safe and long-lasting film-forming agents. Summary of the invention

[0004] One of the purposes of the present invention is to provide a film-forming agent for tobacco bud inhibition, which can prevent the effective ingredients from being washed off by rainwater, release the effective ingredients slowly, and prolong the effective period of the effective ingredients.

[0005] The technical scheme for achieving the above-mentioned purpose of the present invention is: the film-forming agent for tobacco bud inhibition is prepared by the following steps:

[0006] 1. Add polyvinyl alcohol to water, heat and stir until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol aqueous solution;

[0007] 2. adding polyvinyl acetate to the organic solution and stirring until all the polyvinyl acetate is dissolved to obtain a polyvinyl acetate solution;

[0008] 3. adding polypropylene carbonate to an organic solvent and stirring until all of the polypropylene carbonate is dissolved to obtain a polypropylene carbonate solution;

[0009] 4. The polyvinyl alcohol aqueous solution, polyvinyl acetate solution and polypropylene carbonate solution obtained in the above steps are mixed at a mass ratio of 1:4.5-0.1:4.5-0.1, and then a surfactant is added, and the mixture is sheared and dispersed in a high-speed tissue disperser for 5-40 minutes to obtain a film-forming agent;

[0010] In the step 1, the mass ratio of polyvinyl alcohol to water is 1:4-29, the heating temperature is 80-90° C., and the stirring time is 60-120 min.

[0011] In the step 2, the organic solvent is one or more of ethanol, chloroform, and dichloromethane.

[0012] In the step 2, the mass ratio of polyvinyl acetate to organic solvent is 1:4-49, and the stirring time is 30-60 minutes.

[0013] In the step 3, the mass ratio of polypropylene carbonate to solvent is 1:5-50, and the stirring time is 30-60 min.

[0014] In the step 3, the solvent is one or more of ethanol, acetone, and dichloromethane.

[0015] In the step 4, the surfactant is one or more of glucose amide, alcohol ether carboxylate, and styrylphenol polyoxyethylene ether.

[0016] The second object of the present invention is to provide a method for preparing a film-forming agent for tobacco bud inhibition, which can prevent the effective ingredients from being washed off by rainwater, slowly release the effective ingredients, and prolong the effective period of the effective ingredients.

[0017] The technical solution for achieving the above-mentioned purpose of the present invention is: a method for preparing a film-forming agent for suppressing tobacco budding, comprising the following steps:

[0018] 1. Add polyvinyl alcohol to water, heat and stir until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol aqueous solution;

[0019] 2. adding polyvinyl acetate to the organic solution and stirring until all the polyvinyl acetate is dissolved to obtain a polyvinyl acetate solution;

[0020] 3. adding polypropylene carbonate to an organic solvent and stirring until all of the polypropylene carbonate is dissolved to obtain a polypropylene carbonate solution;

[0021] 4. The polyvinyl alcohol aqueous solution, polyvinyl acetate solution and polypropylene carbonate solution obtained in the above steps are mixed at a mass ratio of 1:4.5-0.1:4.5-0.1, and then a surfactant is added, and the mixture is sheared and dispersed in a high-speed tissue disperser for 5-40 minutes to obtain a film-forming agent;

[0022] In the step 1, the mass ratio of polyvinyl alcohol to water is 1:4-29, the heating temperature is 80-90° C., and the stirring time is 60-120 min;

[0023] In the step 2, the organic solvent is one or more of ethanol, chloroform, and dichloromethane;

[0024] In the step 2, the mass ratio of polyvinyl acetate to organic solvent is 1:4-49, and the stirring time is 30-60 min;

[0025] In the step 3, the mass ratio of polypropylene carbonate to solvent is 1:5-50, and the stirring time is 30-60 min;

[0026] In the step 3, the organic solvent is one or more of ethanol, acetone, and dichloromethane;

[0027] In the step 4, the surfactant is one or more of glucose amide, alcohol ether carboxylate, and styrylphenol polyoxyethylene ether.

[0028] The third purpose of the present invention is to provide an application of a film-forming agent for tobacco bud inhibition, which is applied to the preparation of the film-forming agent for tobacco bud inhibition. The prepared tobacco bud inhibition film-forming agent can prevent the effective ingredients from being washed off by rainwater, so that the effective ingredients are slowly released and the effective period of the effective ingredients is prolonged.

[0029] The technical scheme for achieving the above-mentioned purpose of the present invention is: a film-forming agent for tobacco bud inhibition, and the application of the film-forming agent in tobacco bud inhibition.

[0030] When used, the film-forming agent is diluted with water at a mass ratio of 1:199 to 299, and then the bud inhibitor pesticide stock solution is added to obtain a mixed solution. After the tobacco plants are toppled, the obtained mixed solution is sprayed, smeared or sprayed on the axillary buds of the tobacco and the wounds of topping; or after the tobacco plants are toppled and the axillary buds are wiped off, the obtained mixed solution is smeared or sprayed on the wounds of the axillary buds of the tobacco and the wounds of topping.

[0031] The principle of the present invention is to use the emulsion physical blending method to physically mix and modify the hydrophilic monomer compound and the hydrophobic monomer compound to obtain a blended film-forming agent that is resistant to rain erosion. The film-forming property, stability and water resistance of the film-forming agent are controlled by adjusting the proportion of each emulsion, stirring time, etc. The film-forming agent is added to the bud inhibitor so that the effective ingredients therein are not affected by factors such as rain and light and are slowly released, thereby achieving the purpose of extending the effective period of the effective ingredients. The film-forming agent prepared by the method of the present invention has good film-forming property, good water resistance, high film uniformity, good wetting effect, and high biological activity, achieving the purpose of extending the efficacy and ensuring the safety of tobacco growth.

[0032] Regarding the selection of materials for film-forming agents, although sodium polyacrylate, sodium alginate and sodium hydroxymethylcellulose in the invention patent with publication number CN114747572A are easy to form films, they have poor water resistance, the active ingredients are easily washed away by rainwater, the drug is released quickly, and the duration of effect is short. The film-forming agent prepared by polyvinyl alcohol, polyvinyl acetate and polypropylene carbonate in this application has high water resistance, long duration of effect and better drug efficacy compared with the materials in the invention patent with publication number CN114747572A or other materials.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention is applied to tobacco bud suppression operations to mix the active ingredients therein with a film-forming agent and uniformly adhere the mixture to the surface of tobacco leaves to form a drug film, so that the active ingredients therein are not affected by rain, light and other factors and are slowly released, thereby extending the effective period of the active ingredients and achieving better prevention and control effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a microscope picture (100 times) of the film-forming agent M1 in Example 1 after being cured and immersed in water for 20 days. After immersion in water for 20 days, the pores of the film have been significantly enlarged, and although it is slightly damaged, the dissolution is not very obvious. This shows that the film-forming agent M1 has strong water resistance.

[0036] Figure 2 This is a microscope picture (100 times) of the film-forming agent M2 in Example 2 after curing and soaking in water for 20 days. After soaking in water for 20 days, the pores of the film have increased significantly, and although it is slightly damaged, the dissolution is not very obvious. This shows that the M2 film-forming agent has strong water resistance.

[0037] Figure 3 This is a microscope picture (100 times) of the film-forming agent M3 in Example 3 after being cured and immersed in water for 20 days; after immersion in water for 20 days, the pores of the film have been significantly enlarged, and although it is slightly damaged, the dissolution is not very obvious. This shows that the film-forming agent M3 has strong water resistance.

[0038] Figure 4 This is a picture of the result of spraying tobacco leaves with a 200-fold dilution of the M1 film-forming agent in Example 1;

[0039] Figure 5 This is a picture of the result of spraying tobacco leaves with water;

[0040] from Figure 4 , 5 It can be seen that the addition of M1 film-forming agent can completely wet the tobacco leaves, the film formation is highly uniform, and the wetting effect is good; without the addition of M1 film-forming agent, the tobacco leaves cannot be completely wetted.

[0041] Figure 6 This is a picture of adding film-forming agent to tobacco bud suppression operation in Example 1;

[0042] Figure 7 This is a picture of the medication without adding a film-forming agent.

[0043] from Figure 6 , 7 It can be seen that the incidence of tobacco apical buds and axillary buds in the group using film-forming agents during tobacco bud suppression was significantly lower than that in the group without film-forming agents. This shows that adding film-forming agents during tobacco bud suppression can slowly release the active ingredients without being affected by factors such as rain and light, thereby extending the effective period of the active ingredients and achieving better prevention and control effects. DETAILED DESCRIPTION

[0044] Embodiment 1

[0045] The film-forming agent (M1) for suppressing tobacco buds is prepared by the following steps:

[0046] Weigh 4g of polyvinyl alcohol in a round-bottom beaker, add 25ml of ultrapure water, place it on a heat-collecting constant temperature heating magnetic stirrer, adjust the temperature to 85°C and stir for 60min until the polyvinyl alcohol is completely dissolved and place it on the workbench for standby. Take 20g of dichloromethane and put it in a round-bottom beaker, then add 5g of polyvinyl acetate, place it on a magnetic stirrer and stir for 60min until the polyvinyl acetate is completely dissolved and place it on the workbench for standby. Weigh 3g of polypropylene carbonate in a round-bottom beaker, add 15g of dichloromethane, place it on a magnetic stirrer and stir for 60min until the polypropylene carbonate is completely dissolved and place it on the workbench for standby. Add the polyvinyl acetate solution and the polypropylene carbonate solution to the polyvinyl alcohol aqueous solution, add glucose amide, place it on a high-speed disperser emulsification shearing machine for shearing for 10min to obtain the M1 film-forming agent.

[0047] Embodiment 2

[0048] The film-forming agent (M2) for suppressing tobacco buds is prepared by the following steps:

[0049] Weigh 3g of polyvinyl alcohol into a round-bottom beaker, add 45ml of ultrapure water, place on a heat-collecting constant temperature heating magnetic stirrer, adjust the temperature to 85°C and stir for 60 minutes until the polyvinyl alcohol is completely dissolved and place on the workbench for later use. Put 45g of dichloromethane into a round-bottom beaker, add 3g of polyvinyl acetate, place on a magnetic stirrer and stir for 60 minutes. To polyacetic acid After the vinyl ester is completely dissolved, place it on the workbench for later use. Weigh 1g of polypropylene carbonate into a round-bottom beaker. Add 15g of dichloromethane, stir on a magnetic stirrer for 60min, until the polypropylene carbonate is completely dissolved, and then place on a workbench for later use. Add the polyvinyl acetate solution and the polypropylene carbonate solution to the polyvinyl alcohol aqueous solution, add glucamide, and place on a high-speed disperser emulsifying shearing machine for shearing for 10min to obtain the M2 film-forming agent.

[0050] Embodiment 3

[0051] The film-forming agent (M3) for tobacco bud inhibition is prepared by the following steps:

[0052] Weigh 5g of polyvinyl alcohol in a round-bottomed beaker, add 125ml of ultrapure water, place it on a heat-collecting constant temperature heating magnetic stirrer, adjust the temperature to 85°C and stir for 60min until the polyvinyl alcohol is completely dissolved and place it on the workbench for standby. Put 75g of dichloromethane into a round-bottomed beaker, add 3g of polyvinyl acetate, place it on a magnetic stirrer and stir for 60min until the polyvinyl acetate is completely dissolved and place it on the workbench for standby. Weigh 2g of polypropylene carbonate in a round-bottomed beaker, add 50g of dichloromethane, place it on a magnetic stirrer and stir for 60min until the polypropylene carbonate is completely dissolved and place it on the workbench for standby. Add the polyvinyl acetate solution and the polypropylene carbonate solution to the polyvinyl alcohol aqueous solution, add glucose amide, place it on a high-speed disperser emulsification shearing machine for shearing for 15min to obtain the M3 film-forming agent.

[0053] Verification of film-forming properties of film-forming agents

[0054] Film-forming time of film-forming agent: dilute film-forming agent (M1), film-forming agent (M2), and film-forming agent (M3) with water by 300 times, 250 times, and 100 times, respectively, then take 0.5 mL of each on a 25.4 mm × 76.2 mm glass slide, place it at 25°C, and record the time of complete drying.

[0055] Film-forming property of film-forming agent: Film-forming agent (M1), film-forming agent (M2), and film-forming agent (M3) were diluted with water by 300 times, 250 times, and 100 times, respectively, and then 0.5 mL of each was cast on a 25.4 mm × 76.2 mm glass slide to form a film. The film-forming property of the film-forming agent is divided into the following three levels: Level I, uniform film formation, after the glass slide is immersed in water for 0.5 hours, a film can be scraped off the glass slide completely; Level II, uniform film formation, after the glass slide is immersed in water for 0.5 hours, a film cannot be scraped off the glass slide completely; Level III, the film-forming agent cannot form a uniform film on the glass slide.

[0056] M1, M2, and M3 film-forming agents have good film-forming properties and a short film-forming time, which is a necessary guarantee for extending the efficacy of tobacco bud inhibitors.

[0057] Table 1 Film-forming properties of film-forming agents

[0058]

[0059] Water resistance of film-forming agent: Film-forming agent (M1), film-forming agent (M2), and film-forming agent (M3) were diluted with water 300 times, 250 times, and 100 times, respectively, and 0.5 mL of each was cast on a 25.4 mm × 76.2 mm glass slide. Then the glass slide was immersed in water and observed under a microscope (100 times) after 20 days. The results are as follows: Figure 1-3 As shown in the figure, after the three film-forming agents were immersed in water for 20 days, the pores of the films increased to varying degrees. Although they were slightly damaged, the dissolution was not very obvious. It can be seen that the three film-forming agents have strong resistance to rain erosion, and adding them to the tobacco bud inhibitor can ensure the effectiveness and sustained release of the tobacco bud inhibitor.

[0060] Wettability of film formers

[0061] The film-forming agent was prepared according to the method for preparing the M1 film-forming agent in Example 1, and then the film-forming agent was diluted with water, the mass ratio of the M1 film-forming agent to water was 1:299, and the film-forming agent was sprayed on the tobacco leaves. The film-forming agent was qualified if it could completely wet the tobacco leaves, and unqualified if it could not wet the tobacco leaves. The results are as follows Figure 4 As shown in the figure, it can be seen that the film-forming agent prepared by the method of preparing the M1 film-forming agent in Example 1 and diluted with water, when the mass ratio of the M1 film-forming agent to water is 1:299, can completely wet the tobacco leaves, the film formation is high in uniformity, and the wetting effect is good.

[0062] Field verification of film former performance

[0063] Bioassay materials: 125 g / L flumetramid emulsifiable concentrate (Shaanxi Shanggezhilu Biological Co., Ltd.), M1 film-forming agent (M1 film-forming agent prepared in Example 1).

[0064] Experimental instruments: manual tobacco bud suppressor, measuring cylinder.

[0065] Bioassay method: Bioassay was performed in groups according to the table below. The specific method was as follows: for treatment group 1, after the tobacco plants were topped, the bud inhibitor 125 g / L flumetralin EC was diluted 400 times with ultrapure water, and then a manual tobacco bud inhibitor was used to irrigate the top of the tobacco plants, so that the liquid flowed down along the main stem and soaked all axillary buds, and the application rate was 20 mL / plant; for treatment group 2, after the tobacco plants were topped, the bud inhibitor 125 g / L flumetralin EC, M1 film-forming agent and ultrapure water were mixed in a mass ratio of 1:2:400, and then a manual tobacco bud inhibitor was used to irrigate the top of the tobacco plants, so that the liquid flowed down along the main stem and soaked all axillary buds, and the application rate was 20 mL / plant.

[0066] Table 2 Results of field efficacy survey on film-forming agent performance

[0067]

[0068] Efficacy investigation method:

[0069] Investigate the germination of each plant in the test area. Calculate the germination inhibition rate according to the following formula:

[0070] Bud inhibition rate (%) = (total number of buds - number of buds) / total number of buds × 100%

[0071] Terminal bud inhibition rate (%) = (total number of tested tobacco - number of terminal buds) / total number of tested tobacco × 100%

[0072] A control experiment was conducted at the base according to the method of use. The results are shown in Table 3 below:

[0073] Table 3 Field efficacy survey results

[0074]

[0075] The survey results show that the inhibition rate of tobacco apical buds in the group with film-forming agents added during the tobacco bud inhibition operation was 96.67%, and the bud inhibition rate was 78.95%, which were significantly better than the apical bud inhibition rate of 10% and bud inhibition rate of 42.86% in the group without film-forming agents. This shows that the addition of film-forming agents in the tobacco bud inhibition operation can slowly release the active ingredients without being affected by factors such as rain and light, thereby extending the effective period of the active ingredients and having a better prevention and control effect.

Claims

1. A film-forming agent for tobacco bud suppression, characterized in that Prepared by the following steps:

1. Add polyvinyl alcohol to water, heat and stir until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol aqueous solution; 2. adding polyvinyl acetate to the organic solution and stirring until all the polyvinyl acetate is dissolved to obtain a polyvinyl acetate solution; 3. adding polypropylene carbonate to an organic solvent and stirring until all of the polypropylene carbonate is dissolved to obtain a polypropylene carbonate solution; 4. The polyvinyl alcohol aqueous solution, polyvinyl acetate solution and polypropylene carbonate solution obtained in the above steps are mixed at a mass ratio of 1:4.5-0.1:4.5-0.1, and then a surfactant is added, and the mixture is sheared and dispersed in a high-speed tissue disperser for 5-40 minutes to obtain a film-forming agent; In the step 1, the mass ratio of polyvinyl alcohol to water is 1:4-29; In the step 2, the organic solvent is one or more of ethanol, chloroform, and dichloromethane; the mass ratio of polyvinyl acetate to the organic solvent is 1:4-49; In the step 3, the mass ratio of polypropylene carbonate to solvent is 1:5-50; the solvent is one or more of ethanol, acetone, and dichloromethane.

2. The film-forming agent for tobacco bud inhibition according to claim 1, characterized in that In the step 1, the heating temperature is 80-90° C. and the stirring time is 60-120 min.

3. The film-forming agent for suppressing tobacco buds according to claim 1, characterized in that In the steps 2 and 3, the stirring time is 30 to 60 minutes; in the step 4, the surfactant is one or more of glucose amide, alcohol ether carboxylate, and styrylphenol polyoxyethylene ether.

4. A method for preparing a film-forming agent for suppressing tobacco budding, characterized in that The steps include:

1. Add polyvinyl alcohol to water, heat and stir until the polyvinyl alcohol is completely dissolved to obtain a polyvinyl alcohol aqueous solution; 2. adding polyvinyl acetate to the organic solution and stirring until all the polyvinyl acetate is dissolved to obtain a polyvinyl acetate solution; 3. adding polypropylene carbonate to an organic solvent and stirring until all of the polypropylene carbonate is dissolved to obtain a polypropylene carbonate solution; 4. The polyvinyl alcohol aqueous solution, polyvinyl acetate solution and polypropylene carbonate solution obtained in the above steps are mixed at a mass ratio of 1:4.5-0.1:4.5-0.1, and then a surfactant is added, and the mixture is sheared and dispersed in a high-speed tissue disperser for 5-40 minutes to obtain a film-forming agent; In the step 1, the mass ratio of polyvinyl alcohol to water is 1:4-29; In the step 2, the organic solvent is one or more of ethanol, chloroform, and dichloromethane; the mass ratio of polyvinyl acetate to the organic solvent is 1:4-49; In the step 3, the mass ratio of polypropylene carbonate to solvent is 1:5-50; the solvent is one or more of ethanol, acetone, and dichloromethane.

5. The method for preparing the film-forming agent for suppressing tobacco budding according to claim 4, characterized in that In the step 1, the heating temperature is 80-90° C. and the stirring time is 60-120 min.

6. The method for preparing the film-forming agent for suppressing tobacco budding according to claim 4, characterized in that In the steps 2 and 3, the stirring time is 30 to 60 minutes; in the step 4, the surfactant is one or more of glucose amide, alcohol ether carboxylate, and styrylphenol polyoxyethylene ether.

7. The film-forming agent for suppressing tobacco buds according to claims 1-3, characterized in that Prepared by the following steps: Weigh 3g of polyvinyl alcohol into a round-bottom beaker, add 45ml of ultrapure water, place it on a heat-collecting constant temperature heating magnetic stirrer, adjust the temperature to 85°C and stir for 60min until the polyvinyl alcohol is completely dissolved and place it on the workbench for use. Put 45g of dichloromethane into a round-bottom beaker, add 3g of polyvinyl acetate, place it on a magnetic stirrer and stir for 60min until the polyvinyl acetate is completely dissolved and place it on the workbench for use. Weigh 1g of polypropylene carbonate into a round-bottom beaker, add 15g of dichloromethane, place it on a magnetic stirrer and stir for 60min until the polypropylene carbonate is completely dissolved and place it on the workbench for use. Add polyvinyl acetate solution and polypropylene carbonate solution to polyvinyl alcohol aqueous solution, add glucose amide, place on high-speed disperser emulsifying shearing machine for shearing for 10 minutes to obtain film-forming agent; when used, dilute the film-forming agent with water at a mass ratio of 1:199-299, and then add the bud inhibitor pesticide stock solution to obtain a mixed solution. After the tobacco plants are toppled, the obtained mixed solution is sprayed, smeared or sprayed on the axillary buds of tobacco and the wounds of topping; or after the tobacco plants are toppled and the axillary buds are wiped off, the obtained mixed solution is smeared or sprayed on the axillary bud wounds of tobacco and the wounds of topping.

8. The film-forming agent for tobacco bud inhibition according to claims 1-3, characterized in that The preparation is carried out in the following steps: 3g of polyvinyl alcohol is weighed into a round-bottomed beaker, 45ml of ultrapure water is added, and the mixture is placed on a heat-collecting constant temperature heating magnetic stirrer, the temperature is adjusted to 85°C and stirred for 60min, and the polyvinyl alcohol is completely dissolved and then placed on a workbench for standby use. 45g of dichloromethane is placed into a round-bottomed beaker, and then 3g of polyvinyl acetate is added, and the mixture is placed on a magnetic stirrer for stirring for 60min, and the polyvinyl acetate is completely dissolved and then placed on a workbench for standby use. 1g of polypropylene carbonate is weighed into a round-bottomed beaker, 15g of dichloromethane is added, and the mixture is placed on a magnetic stirrer for stirring for 60min, and the polypropylene carbonate is completely dissolved and then placed on a workbench for standby use. The polyvinyl acetate solution and the polypropylene carbonate solution are added to the polyvinyl alcohol aqueous solution, and glucose amide is added, and the mixture is placed on a high-speed disperser emulsifying shearing machine for shearing for 10min to obtain a film-forming agent.

9. The film-forming agent for tobacco bud inhibition according to claim 1-3, characterized in that The preparation is carried out in the following steps: 5g of polyvinyl alcohol is weighed into a round-bottomed beaker, 125ml of ultrapure water is added, and the mixture is placed on a heat-collecting constant temperature heating magnetic stirrer, the temperature is adjusted to 85°C and stirred for 60min, and the polyvinyl alcohol is completely dissolved and then placed on a workbench for standby use. 75g of dichloromethane is placed in a round-bottomed beaker, and then 3g of polyvinyl acetate is added, and the mixture is placed on a magnetic stirrer for stirring for 60min, and the polyvinyl acetate is completely dissolved and then placed on a workbench for standby use. 2g of polypropylene carbonate is weighed into a round-bottomed beaker, 50g of dichloromethane is added, and the mixture is placed on a magnetic stirrer for stirring for 60min, and the polypropylene carbonate is completely dissolved and then placed on a workbench for standby use. The polyvinyl acetate solution and the polypropylene carbonate solution are added to the polyvinyl alcohol aqueous solution, and glucose amide is added, and the mixture is placed on a high-speed disperser emulsifying shearing machine for shearing for 15min to obtain a film-forming agent.

10. The film-forming agent for tobacco bud inhibition according to claim 1 or 5, and use of the film-forming agent in tobacco bud inhibition.

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