Plant protection agents, methods for their preparation, use and application

Abstract

The application discloses a plant protection agent, a preparation method, application and application method thereof. The raw material composition of the plant protection agent comprises, in percentage by mass, 40-60% of an oil agent, 10-45% of a film forming compound agent, 2-30% of a dispersing agent and 0-10% of an adhesion agent. The plant protection agent is a non-toxic and harmless spraying emulsion product specially used for plant protection, and provides an efficient and environment-friendly solution for the agricultural industry. The formula of the product adopts common oil-based ingredients as a basis, combines with strictly screened cosmetic-grade surfactants and suspended particles, and ensures the safety and reliability of the product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plant protection, in particular to a plant protection agent and a preparation method, application and application method thereof. BACKGROUND

[0002] The background of the present application relates to the growing demand for organic agriculture and green food, which is due to people's pursuit of healthy food, concern for environmental sustainability and awareness of the potential harm of chemical pesticides to the ecosystem. Therefore, it is necessary to take effective and environmentally friendly methods to control diseases and pests during plant growth to ensure the quality and safety of agricultural products.

[0003] In this case, the use of synthetic pesticides has been prevalent in the agricultural industry for decades. Synthetic pesticides are artificially synthesized chemicals to combat diseases, fungi and pests to protect the growth and yield of crops. Although synthetic pesticides have played an important role in the management of plant diseases, pests and weeds in the short term, their effectiveness has been significantly limited due to the slowing pace of research and development of new pesticides. In addition, the problems of residues and degradation rates of synthetic compounds in the environment, toxicity to non-target organisms, and safety risks to operators are still the focus of the agricultural community.

[0004] Studies have shown that more than 90% of pesticides and herbicides do not reach the target crops, but enter the soil, water and atmosphere through rainwater runoff, soil infiltration, aerosol diffusion and other pathways. The presence of these chemical pesticide residues has had a wide range of impacts on the environment, not limited to the application site, but spreading to surrounding areas, causing potential harm to biodiversity, ecosystem stability and ecological balance. It is particularly worth noting that the widespread use of pesticides has led to a decrease in many wild bees, which has a negative impact on the pollination of crops and the health of the ecosystem.

[0005] In order to address these challenges, the green control field is committed to developing innovative film materials for protecting the growth and development of economically important crops. A large number of research and patent documents have explored the methods of providing fresh-keeping and protection effects on the surface of fruits and vegetables by films made of natural sources, low toxicity or edible materials. These materials have nanostructure and multifunctional properties, such as chitosan, alginic acid and other natural polymer film formers, which not only have antibacterial and antioxidant properties, but also can form an effective physical barrier to prevent the invasion of pathogenic microorganisms and damage to crops.

[0006] For example, Chinese patent application No. CN201710750157.X discloses a method for coating protection of citrus economic crops. This method uses a combination of plant essential oils, chitosan and plant complex extract to form a protective film by spraying during the fruit harvesting period. This film significantly improves the anti-fungal and anti-insect effects of citrus fruits during the harvesting period, effectively reducing the incidence of disease, and making it close to or even surpassing traditional chemical control methods in terms of preservation effect.

[0007] In addition, Chinese patent No. CN114794231B discloses a method for microcapsule composite coating protection agent using chitosan and plant essential oil as the main carrier and its application. This method takes full advantage of the antioxidant and film-forming properties of chitosan and plant essential oil, and combines with polyethylene glycol (PEG), polyvinyl alcohol (PVA), gelatin and other high molecular compounds to form a stable microcapsule composite coating. This composite coating has excellent protective physical properties and can continuously release active ingredients on fruits such as mangoes, effectively inhibiting the growth of pathogenic microorganisms and fruit rot, thereby prolonging the shelf life of the fruit.

[0008] Despite some breakthroughs in post-harvest loss prevention, there are still certain limitations in the existing technology. The above-mentioned technology mainly focuses on controlling and preserving after picking in a controllable environment. However, during the ripening and picking process of many fruits, damage and disease have already occurred. Therefore, the market demand for coating and film protection of plants starts from the whole growth cycle of plants and aims to reduce damage, improve yield and product quality. To achieve this goal, future research and development should focus on the optimization of protective film technology for different crops, including further exploration of material selection, film-forming process and durability evaluation. SUMMARY

[0009] To address the above technical problems and deficiencies in the field, the present invention provides a plant protection agent, which is a non-toxic and harmless spray-use emulsion product specifically for plant protection, providing an efficient and environmentally friendly solution for the agricultural industry. The formula of the product uses common oil-based ingredients as the base, combined with strictly selected cosmetic-grade surfactants and suspended particles to ensure the safety and reliability of the product.

[0010] A plant protection agent, the raw material composition includes, in mass percentage:

[0011]

[0012]

[0013] The oil agent can be a component of one or more unsaturated fatty acids or fatty ester functional groups. The oil agent can be a natural oil product or a compound of the natural oil product and polyethylene glycol.

[0014] The natural oil product can be selected from at least one of soybean oil, flaxseed oil, coconut oil, jojoba oil, sunflower oil, olive oil, corn oil, rapeseed oil, castor oil, almond oil, and the like, with a viscosity range of 30-6000 cP.

[0015] The film-forming complexing agent helps to form a uniform and stable film layer, providing reliable protection. The film-forming complexing agent can be a micron-sized powder selected from at least one of zeolite particles, kaolin, diatomite, attapulgite, corn starch, calcium carbonate powder, and the like.

[0016] The dispersant can be a single surfactant or a combination of multiple surfactants to achieve good dispersion performance. The dispersant can be selected from at least one of sodium alginate (CAS No. 9005-38-3), chitosan hydrochloride (CAS No. 70694-72-3), polyacrylic acid (CAS No. 9003-01-4), polyethyleneimine (CAS No. 9002-98-6), hydroxypropyl methylcellulose (CAS No. 9004-65-3), sodium cetylbenzenesulfonate, polydimethylsiloxane (CAS No. 107-46-0), heptamethyltrisiloxane, Triton-X100 (CAS No. 9036-19-5), and Span 85.

[0017] The adhesion agent can be a micron-sized powder product. The adhesion agent can be selected from at least one of guar gum, xanthan gum, abelmosk gum, sodium carboxymethyl cellulose, and the like.

[0018] The adhesion agent in the raw material can be added in the form of an aqueous solution. In an embodiment, the mass concentration of the adhesion agent in the aqueous solution is not more than 40%, which helps to improve the adhesion of the coating.

[0019] In a preferred embodiment, the plant protection agent is a plant protection agent against diseases, pests, and sunscald, and the raw material composition is any one of the following Formulas A-C:

[0020] Formula A: the raw material composition is as follows in terms of mass percentage:

[0021]

[0022] The mass concentration of chitosan hydrochloride in the chitosan hydrochloride aqueous solution is 60%;

[0023] Formula B: the raw material composition is as follows in terms of mass percentage:

[0024]

[0025] The polyacrylic acid / sodium hexadecyl benzene sulfonate compound is a mixture of a polyacrylic acid aqueous solution and sodium hexadecyl benzene sulfonate at a mass ratio of 1:1, the mass concentration of polyacrylic acid in the polyacrylic acid aqueous solution is 50%, and the mass concentration of sodium hexadecyl benzene sulfonate in the sodium hexadecyl benzene sulfonate aqueous solution is 60%.

[0026] The mass concentration of polyethyleneimine in the polyethyleneimine aqueous solution is 60%.

[0027] Formula C: the raw material composition is as follows in percentage by mass:

[0028]

[0029] The mass concentration of Triton X-100 in the Triton X-100 aqueous solution is 60%.

[0030] In a preferred embodiment, the plant protection agent is a rain-erosion-resistant plant protection agent, and the raw material composition is any one of the following formulas B, D-H:

[0031] Formula B: the raw material composition is as follows in percentage by mass:

[0032]

[0033] The polyacrylic acid / sodium hexadecyl benzene sulfonate compound is a mixture of a polyacrylic acid aqueous solution and sodium hexadecyl benzene sulfonate at a mass ratio of 1:1, the mass concentration of polyacrylic acid in the polyacrylic acid aqueous solution is 50%, and the mass concentration of sodium hexadecyl benzene sulfonate in the sodium hexadecyl benzene sulfonate aqueous solution is 60%.

[0034] The mass concentration of polyethyleneimine in the polyethyleneimine aqueous solution is 60%.

[0035] Formula D: the raw material composition is as follows in percentage by mass:

[0036]

[0037] The polyacrylic acid / sodium hexadecyl benzene sulfonate compound is a mixture of a polyacrylic acid aqueous solution and sodium hexadecyl benzene sulfonate at a mass ratio of 1:1, the mass concentration of polyacrylic acid in the polyacrylic acid aqueous solution is 50%, and the mass concentration of sodium hexadecyl benzene sulfonate in the sodium hexadecyl benzene sulfonate aqueous solution is 60%.

[0038] The mass concentration of polyethyleneimine in the polyethyleneimine aqueous solution is 60%.

[0039] Formula E: the raw material composition is as follows in percentage by mass:

[0040]

[0041] The mass concentration of sodium hexadecyl benzene sulfonate in the sodium hexadecyl benzene sulfonate aqueous solution is 60%.

[0042] Formula F: the raw material composition is as follows in mass percentage:

[0043]

[0044] The mass concentration of the heptamethyltrisiloxane in the heptamethyltrisiloxane aqueous solution is 60%;

[0045] Formula G: the raw material composition is as follows in mass percentage:

[0046]

[0047]

[0048] The mass concentration of the sodium hexadecylbenzenesulfonate in the sodium hexadecylbenzenesulfonate aqueous solution is 60%;

[0049] Formula H: the raw material composition is as follows in mass percentage:

[0050]

[0051] The polyacrylic acid / sodium hexadecylbenzenesulfonate complex is a mixture of a polyacrylic acid aqueous solution and sodium hexadecylbenzenesulfonate at a mass ratio of 1:1, the mass concentration of the polyacrylic acid in the polyacrylic acid aqueous solution is 50%,

[0052] The mass concentration of the polyethyleneimine in the polyethyleneimine aqueous solution is 60%.

[0053] The application further provides a preparation method of the plant protection agent.

[0054] The application further provides an application of the plant protection agent in the field of plant protection.

[0055] The application further provides an application method of the plant protection agent, wherein the plant protection agent is diluted with water and uniformly mixed, and then sprayed on the leaf surface or fruit of a plant.

[0056] In the application process, the plant protection agent spraying liquid of the application is uniformly sprayed on the leaf surface or fruit of a plant, and a uniform thin film is formed through natural air drying. The thin film has excellent protection capability and can effectively isolate the invasion of pests and prevent the pests from damaging the plant. Meanwhile, the plant protection agent spraying liquid of the application also has excellent rain erosion resistance, and can maintain stable protection effect even under adverse weather conditions. In addition, the plant protection agent product of the application can also play a lightening role under strong sunlight, reducing the damage of the plant caused by excessive exposure to sunlight.

[0057] In particular, in orchard cultivation, the plant protection agent spray liquid of the present application can provide multiple protection throughout the entire growth cycle. It can continuously function at different growth stages of the plant, from the early stage of planting to the fruit ripening stage, providing persistent protection for trees and fruits. This comprehensive protection helps reduce the incidence of diseases and pests, improves the yield and quality of fruits, and reduces crop losses, bringing considerable economic benefits to agricultural producers.

[0058] In summary, the non-toxic and harmless spray emulsion product of the present application has broad application prospects in the field of plant protection. It provides a reliable protective barrier by forming a film, protecting plants from insect pests, and has excellent weather resistance. The application of this technology not only improves the yield and quality of crops, but also promotes the development of sustainable agriculture and achieves the goal of green food production. BRIEF DESCRIPTION OF DRAWINGS

[0059] Figure 1 Figure 6 is a photograph of the citrus leaf surface after spraying the plant protection agent of Formula II / Example 2.

[0060] Figure 2 Figure 7 is a photograph of the tomato leaf surface after spraying the plant protection agent of Formula I / Example 10.

[0061] Figure 3 Figure 8 is a graph showing the weight change results of the citrus leaf surface after spraying the plant protection agent, placing it at 60 degrees, and then flushing and drying.

[0062] Figure 4 Figure 9 is a graph showing the weight change results of the tomato leaf surface after spraying the plant protection agent, placing it at 60 degrees, and then flushing and drying. DETAILED DESCRIPTION

[0063] The present application will be further described in conjunction with the accompanying drawings and specific examples. It should be understood that these examples are only used to illustrate the present application and not to limit the scope of the present application. The operating methods not specified in the following examples are usually carried out under conventional conditions or under the conditions recommended by the manufacturer. In Formulas I, II and III: the film-forming complex agent is all silicate, the adhesion agent is guar gum, and polyacrylic acid / sodium cetylbenzenesulfonate refers to a mixture of polyacrylic acid aqueous solution and sodium cetylbenzenesulfonate with a mass ratio of 1:1, wherein the mass concentration of polyacrylic acid in the polyacrylic acid aqueous solution is 50%.

[0064] Plant protection agent, Formula I, see Table 1.

[0065] Table 1

[0066] Ingredients Mass percent (%) Soybean oil 40 Corn oil 20 Film forming complex 36 Dispersant-1 2.5 Dispersant-2 Dispersant-2 / water mixture at 60 wt% concentration 0.8 Adhesion agent 0.7

[0067] The specific ingredients of dispersant-1 and dispersant-2 in Table 1 are shown in Table 2, thereby forming 10 groups of application cases under the formula one system.

[0068] Table 2

[0069] Ingredients Dispersant-1 Dispersant-2 Application Example-1 Sodium alginate Chitosan hydrochloride Application Example-2 Polyacrylic acid / sodium hexadecyl benzene sulfonate Polyethylene imine Application Example-3 Span 85 Triton X-100 Application Example-4 Hydroxypropyl methylcellulose Sodium hexadecyl benzene sulfonate Application Example-5 Span 85 Polydimethylsiloxane Application Example-6 Hydroxypropyl methylcellulose Triton X-100 Application Example-7 Span 85 Heptamethyltrisiloxane Application Example-8 Span 85 Sodium hexadecyl benzene sulfonate Application Example-9 Hydroxypropyl methylcellulose Polydimethylsiloxane Application Example-10 Hydroxypropyl methylcellulose Heptamethyltrisiloxane

[0070] Plant protection agent, formula two, see Table 3.

[0071] Table 3

[0072] Ingredients Mass percent (%) Soybean oil 35 Rapeseed oil 22 Film forming complex 38 Dispersant-1 3.5 Dispersant-2 Dispersant-2 / water mixture at 60 wt% concentration 0.8 Adhesion agent 0.7

[0073] The specific ingredients of dispersant-1 and dispersant-2 in Table 3 are shown in Table 4, thereby forming 10 groups of application cases under the formula two system.

[0074] Table 4

[0075] Ingredients Dispersant-1 Dispersant-2 Application Example-1 Sodium alginate Chitosan hydrochloride Application Example-2 Polyacrylic acid / sodium hexadecyl benzene sulfonate Polyethylene imine Application Example-3 Span 85 Triton X-100 Application Example-4 Hydroxypropyl methylcellulose Sodium hexadecyl benzene sulfonate Application Example-5 Span 85 Polydimethylsiloxane Application Example-6 Hydroxypropyl methylcellulose Triton X-100 Application Example-7 Span 85 Heptamethyltrisiloxane Application Example-8 Span 85 Sodium hexadecyl benzene sulfonate Application Example-9 Hydroxypropyl methylcellulose Polydimethylsiloxane Application Example-10 Hydroxypropyl methylcellulose Heptamethyltrisiloxane

[0076] Plant protection agent, formula three, see Table 5.

[0077] Table 5

[0078] Ingredients Mass percent (%) Soybean oil 30 Linseed oil 30 Film forming complex 36 Dispersant-1 2.5 Dispersant-2 Dispersant-2 / water mixture at 60 wt% concentration 0.8 Adhesion agent 0.7

[0079] The specific ingredients of dispersant-1 and dispersant-2 in Table 5 are shown in Table 6, thereby forming 10 groups of application cases under the formula three system.

[0080] Table 6

[0081] Ingredients Dispersant-1 Dispersant-2 Application Example-1 Sodium alginate Chitosan hydrochloride Application Example-2 Polyacrylic acid / sodium hexadecyl benzene sulfonate Polyethylene imine Application Example-3 Span 85 Triton X-100 Application Example-4 Hydroxypropyl methylcellulose Sodium hexadecyl benzene sulfonate Application Example-5 Span 85 Polydimethylsiloxane Application Example-6 Hydroxypropyl methylcellulose Triton X-100 Application Example-7 Span 85 Heptamethyltrisiloxane Application Example-8 Span 85 Sodium hexadecyl benzene sulfonate Application Example-9 Hydroxypropyl methylcellulose Polydimethylsiloxane Application Example-10 Hydroxypropyl methylcellulose Heptamethyltrisiloxane

[0082] Before conducting the above application cases, the treatment of agricultural product samples needs to be carried out. The field plot selected in the field ensures that the number and growth state of crops meet the median standard. If fruit tree types are involved, plants with median number, state and age of leaves are selected to ensure the representativeness and comparability of the experiment.

[0083] In order to verify the effectiveness of the present application, overcast working conditions of 25-30°C are selected. Before applying the formula protection agent, water spraying treatment is carried out, 1 liter of water is sprayed, and after 2-3 hours, waiting for the water to evaporate completely, ensuring that the sample surface is dry. This step helps to reduce the interference of other factors on the experimental results, and ensures the accurate evaluation of the adhesion performance and protection effect of the protection agent.

[0084] The preparation of the application case solution is diluted in equal proportions according to the original protective agent 1:20 (i.e. 1 mass part of plant protection agent is diluted with water until 20 mass parts of plant protection agent / water mixture are obtained) to ensure that the concentration used during the actual application is appropriate, both to exert the effect of the protective agent and to ensure an economically reasonable dosage.

[0085] In the adhesion and rain washing test, the diluted protective agent is uniformly sprayed on the sheared leaf surface with a diameter of 10 cm. To ensure that the protective agent covers the entire leaf surface, the test leaf surface is weighed and recorded in advance to ensure that the leaf surface mass used in each experiment is similar. Subsequently, the leaf surface is placed on an inclined plane with an inclination angle of 60 degrees and left for 12 hours to allow the protective agent to form a stable protective film. This can simulate the conditions of the leaf surface in the actual growth environment and evaluate the adhesion performance and durability of the protective agent.

[0086] Subsequently, the leaf surface is sprayed with a water spray gun for 10 seconds to simulate the effect of rain washing. Then, the leaf is placed in a drying machine at 35°C for 1 hour to evaluate the water resistance and adhesion of the protective agent. Finally, the leaf is removed, weighed and recorded to evaluate the protective effect and adhesion performance of the protective agent after rain washing.

[0087] Through the above experimental design and detailed measurement steps, the adhesion and rain washing resistance of the protective agent of the present application in the actual application scenario can be accurately evaluated. These experimental data will provide reliable basis for the application performance of the present application, further proving its practicability and superiority in the field of agriculture.

[0088] According to the above two test methods and standards, the present application uses siliceous-magnesium soil as a film-forming complex agent and guar gum as an adhesive to prepare the above-mentioned 30 protective agents, which are tested under relatively similar environmental conditions.

[0089] During the entire field test, similar formulations were compared, and Formulation One, Formulation Two and Formulation Three were evaluated as the same test group. Each group was tested 3 times to select the best formulation. Subsequently, the best formulation of each group and the commercially available protective agent Yugan film formed the final test group, which was tested 3 times, and the abnormal data in the test was excluded, and finally the experimental results were analyzed.

[0090] Among them, application case-1 in formulation one is determined as the best formula in this group, and application case-2 in formulation two shows excellent performance in this group. Similarly, application case-3 in formulation three shows the highest efficacy in this group. The final experimental test group includes formulation one / application case-1, formulation two / application case-2, formulation three / application case-3, and the commercially available reference protective agent Yugan film AA-0013 (commercial control group).

[0091] In 2022, a field test was conducted in Sandu Town, Jiande City, Hangzhou, Zhejiang Province. The test field was divided into 4 plots, with protective rows between each plot. The test treatments were randomly arranged. In order to reduce the influence of environmental factors in the field test, a semi-transparent glass greenhouse was chosen as the test environment. The greenhouse test lasted for 90 days, and mature fruit honey oranges were sprayed to prevent sunburn and the occurrence of pests and diseases. If necessary, timely thinning was carried out. Before spraying, the fruit was evaluated and its condition was recorded, and any visible sunburn or pest signs were considered as indicators of poor fruit quality. After 90 days, the overall fruit condition of the plants in the greenhouse was statistically analyzed.

[0092] For the anti-pest and anti-sunburn performance of the fruit, the field test yielded the following table showing the results of the greenhouse test, including the composition of the test groups and the percentage of fruits that remained in good condition after 90 days, as shown in Table 7.

[0093] Table 7

[0094] Test Group Ingredients Fruit statistics after 90 days Greenhouse test 1 Formulation one / Application Example-1 58.1％ Greenhouse test 2 Formulation two / Application Example-2 73.3％ Greenhouse test 3 Formulation three / Application Example-3 64.2％ Greenhouse test 4 Commercial control group 38.5％

[0095] Please note that the above data tables present the composition of each test group in the field and greenhouse tests, as well as the percentage of fruits that remained in good condition after 90 days. These results help to evaluate the effectiveness of different combinations of pesticides and anti-pest, anti-sunburn agents on fruit.

[0096] Formulation Two / Application Example-2 uses soybean oil / rapeseed oil as the base, with specific ratios of oil agent ingredients. The dispersant in this formulation is polyethyleneimine / polyacrylic acid (sodium hexadecylbenzenesulfonate), which promotes the dispersion and uniform distribution of the ingredients. At the same time, silica and guar gum act as adjuvants, interacting with the oil agent ingredients to enhance the adhesion and durability of the protective agent. This formulation has been tested in the field and proven to be the most effective protective agent combination for citrus fruit protection. In practical applications, this formulation can effectively resist pests and reduce the impact of sunburn on fruit, providing long-lasting protection. This is mainly due to the special properties of soybean oil / rapeseed oil, as well as the dispersing ability of polyethyleneimine / polyacrylic acid (sodium hexadecylbenzenesulfonate) dispersant and the synergistic effect of silica and guar gum. The accurate ratio of this formulation and the correct application method are crucial to ensure the effectiveness of the protective agent, to fully realize its potential to protect fruit, and to provide reliable protection measures for citrus growers.

[0097] In the adhesion and rain wash test, we will perform the following steps: First, we will dilute the protectant (and the commercial protectant being evaluated will be diluted in the same manner) and add ethylene bisdithiocarbamate fungicide (added in an amount of one thousandth of the protectant dilution) to the solutions. All solutions will be sprayed evenly on the leaf surface with a shearing diameter of 10 cm. To ensure that the protectant can completely cover the entire leaf surface, we will weigh and record the test leaf surface before the experiment begins to ensure that the leaf surface used in each experiment is similar in mass. Next, we will place the leaf surface on an inclined plane at an angle of 60 degrees for 12 hours, which allows the protectant to form a stable protective film. Through such treatment, we can better simulate the conditions of the leaf surface in the actual growing environment and evaluate the adhesion and durability of the protectant.

[0098] After evaluating the adhesion of the protectant, we will simulate the effect of rain washing. Specifically, we will use a water spray gun to spray the leaf surface for 10 seconds. This operation can simulate the effect of rain washing, further evaluating the water resistance and adhesion of the protectant.

[0099] To evaluate the protective effect and adhesion of the protectant after rain washing, we will place the leaf in a 35°C air dryer for 1 hour and weigh it. This step can help us evaluate whether the protectant can maintain its protective effect and adhesion after being washed by rain.

[0100] Finally, we will take out the leaf and wash it with high-pressure water for 5 times, 5 mL each time. We will collect all the washed solutions, and all solutions will be detected by high-performance liquid chromatography (HPLC). By comparing the content of ethylene bisdithiocarbamate, we can further evaluate the performance of the protectant in terms of protective effect and adhesion after rain washing.

[0101] Repeat the experimental steps on red beauty citrus leaf and tomato leaf Figure 1 、 Figure 2 Results and Figure 3 、 Figure 4 Data. Figure 3 、 Figure 4 The legends in the figures correspond to Table 8 as shown below. Figure 3 、 Figure 4 The data in Table 8 shows the relative retention of ethylene bisdithiocarbamate detected by HPLC, with the amount of ethylene bisdithiocarbamate sprayed as the basis for 100%.

[0102] Table 8

[0103]

[0104] In the repeated experiments on tomato leaves and citrus leaves, two different formulations were tested and separated by ethylene bisdithiocarbamate using HPLC. Specifically, formulation two / application case-2 used soybean oil / rapeseed oil as the base, formulated the oil component according to a specific ratio, combined with polyethyleneimine / polyacrylic acid (sodium hexadecylbenzenesulfonate) as the dispersant, and added attapulgite and guar gum. Correspondingly, formulation one / application case-10 used soybean oil / corn oil, formulated the oil component according to the ratio, combined with hydroxypropyl methyl cellulose and heptamethyltrisiloxane as the dispersant, and added attapulgite and guar gum.

[0105] The experimental results show that formulation two / application case-2 exhibits outstanding rain wash resistance on tomato leaves, while formulation one / application case-10 also shows excellent protection on citrus leaves with slightly different leaf properties. These two preferred formulations can form a uniform film and reduce the infestation of pests and diseases on the leaf surface. Notably, in the plum rain climate zone, these formulations have withstood several rain washes and still maintained the retention of the drug, showing a lasting protective effect.

[0106] Soybean oil / rapeseed oil and soybean oil / corn oil in the formulations serve as the base oil agent, which has good wetting and adhesion properties and can effectively adhere to the leaf surface. Polyethyleneimine / polyacrylic acid (sodium hexadecylbenzenesulfonate) and hydroxypropyl methyl cellulose / heptamethyltrisiloxane as the dispersant can enhance the dispersibility of the components, allowing them to be evenly distributed in the oil agent. The addition of attapulgite and guar gum further improves the adhesion and durability of the protective agent, enhancing the protection effect on the leaf surface.

[0107] Through testing on tomato and citrus leaves, we successfully determined the optimal protective agent formulations suitable for these two crops. These formulations not only reduce the infestation of pests and diseases after film formation, but also maintain the effective retention of the drug when facing multiple rain washes during the plum rain season. Therefore, for the cultivation of green organic crops, these formulations can provide efficient protection and ensure that the plant leaves are fully protected, while also helping to protect the quality and yield of the fruit. In summary, these formulations exert excellent protective efficacy throughout the entire life cycle of the plant.

[0108] In addition, it should be understood that, after reading the above description of the present application, those skilled in the art can make various modifications or modifications to the present application, and these equivalent forms also fall within the scope defined by the claims attached to the present application.

Claims

1. A plant protection agent, characterized in that, The raw material composition is as follows in mass percentage: The polyacrylic acid / sodium hexadecyl benzene sulfonate compound is a mixture of polyacrylic acid aqueous solution and sodium hexadecyl benzene sulfonate at a mass ratio of 1:1, the mass concentration of polyacrylic acid in the polyacrylic acid aqueous solution is 50%, and the mass concentration of sodium hexadecyl benzene sulfonate is 50%, The mass concentration of polyethylene imine in the polyethylene imine aqueous solution is 60%.

2. The method of preparing a plant protection agent according to claim 1, characterized in that, The plant protection agent is obtained by uniformly mixing the raw materials.

3. Application of the plant protection agent of claim 1 in the field of plant protection.

4. The method of applying a plant protection agent according to claim 1, wherein The plant protection agent is diluted with water and uniformly mixed, and then sprayed on the leaves or fruits of plants.

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