Herbicide synergist, method of preparation and use thereof

Abstract

The application belongs to the technical field of pesticides, and particularly relates to a herbicide synergistic adjuvant, a preparation method and application. The herbicide synergistic adjuvant is prepared from taurine, dodecyl phenol-formaldehyde dimer sodium sulfonate, ethoxylated glycerol triester and deionized water. The herbicide synergistic adjuvant has the ability of improving herbicide wetting spreading, rainwater washing resistance and absorption and conduction, can improve the weed control effect, and can achieve the effects of reducing the use of herbicides and reducing the development process of weed resistance weeds under the condition of achieving the same control effect.

Description

Technical Field

[0001] This invention belongs to the field of pesticide technology, specifically relating to a herbicide synergist, its preparation method, and its application. Background Technology

[0002] Food crops are the fundamental material resources upon which humankind depends for survival, and their high and stable yields are directly related to the quality of life of the people. However, various factors restrict crop yield formation and quality improvement, among which weeds are one of the biggest factors affecting the high and stable yields of food crops. Weeds, through mechanisms such as resource competition, allelopathic inhibition, and acting as intermediate hosts for pests and diseases, directly or indirectly weaken crop growth, causing serious yield losses and negative economic benefits. Unlike crop pests and diseases, which occur intermittently throughout the year, weed damage is always present alongside agricultural production activities, exhibiting continuous companionship and high adaptability. As long as artificially cultivated crops exist, weeds, with their strong self-reproduction ability and rapid evolutionary adaptability, will continue to pose a threat to food production. Weeds are numerous and prevalent in my country's crop fields (including rice, wheat, soybeans, corn, etc.), fruit and mulberry gardens, tea gardens, and various non-arable lands. Taking rice paddies as an example, the noxious weed *Echinochloa crus-galli* (L.) P. Beauv. and other species of the genus *Echinochloa* are widespread in various types of rice paddies across the country, causing serious damage. Meanwhile, the intraspecific weed type of rice, *Oryza sativa* f. spontanea, has been rapidly expanding in recent years with the expansion of direct-seeded rice planting areas, and its damage has been increasing year by year. Wheat fields also face severe weed infestations. Jointed goatgrass (Aegilopstauschii Coss.) and wild oat (Avena fatua L.) are prevalent in the wheat-growing areas of the Huang-Huai-Hai Plain and the middle and lower reaches of the Yangtze River, causing increasingly serious damage. Jointed goatgrass, in particular, due to its close relationship with wheat and its difficulty in identifying seedlings, has become the number one challenge in integrated wheat field management. Meanwhile, *Beckmannia syzigachne* (Steud.) Fernald is a major weed in rice-wheat and rapeseed fields in the Yangtze River basin and southwest China, causing severe damage, especially in low-lying areas with heavy clay soils. It grows rapidly and sometimes forms a single dominant community. Weeds in crop fields have seeds that mature earlier than the crops, exhibiting strong shattering and dormancy characteristics. Once fallen into the soil, they can survive for several years, accumulating over time to form a vast "soil seed bank," becoming a source of continuous weed damage.

[0003] The use of chemical herbicides to control weeds is an indispensable key technology in modern agricultural production. Its importance lies in the fact that it is the most efficient and economical means of dealing with weed threats. Weeds compete with crops for light, water, fertilizer, and space, and in severe cases, can lead to significant yield reductions or even crop failure. Chemical control using herbicides can quickly and extensively suppress weeds, buying valuable growth windows for crops. Especially against the backdrop of increasing labor shortages, it is an absolutely indispensable weed control measure for large-scale agricultural operations.

[0004] Compared with other weeding methods, chemical weeding has significant advantages. Compared with manual weeding, it saves labor and effort, and its efficiency can be increased by tens or even hundreds of times, greatly liberating agricultural productivity; compared with mechanical weeding, it is not limited by soil moisture and terrain, and can accurately kill weeds between plants without damaging the topsoil or crop roots by turning over the soil; compared with biological control, it is extremely fast-acting and can suppress weed outbreaks in a short time.

[0005] Although the number and availability of active ingredients in registered herbicides for crop fields are currently quite large, the application of chemical herbicides has not completely eliminated the pressure of weed control in the fields. Long-term reliance on chemical herbicides with relatively concentrated mechanisms of action can easily lead to the succession of weed community structures, the rise of some difficult-to-control weeds, and the accelerated occurrence and spread of herbicide-resistant weeds, thus reducing the weed control efficacy of commonly used herbicides in the field. To ensure control effectiveness, producers often tend to increase the dosage, but simply increasing the dosage not only fails to effectively control weeds but may also increase the risk of crop damage and yield loss. Therefore, without blindly increasing the input of active ingredients in herbicides, improving the wetting, spreading, adhesion, and absorption and translocation of the herbicide solution through spray adjuvants to enhance herbicide utilization efficiency and weed control efficacy, thereby achieving synergistic effects with reduced herbicide use, has become an important research direction in the field of chemical weed control.

[0006] Tank-mix adjuvants (also known as spray adjuvants) are auxiliary substances added directly by the user to the diluted pesticide solution at the application site (i.e., in the sprayer's liquid tank), mixed thoroughly, and then sprayed. These adjuvants are convenient and flexible to use, and can significantly enhance pesticide efficacy when mixed with pesticides, thus finding widespread application in modern agriculture. Tank-mix adjuvants primarily achieve synergistic effects by reducing the interfacial tension of the pesticide solution and enhancing its wetting and spreading ability on the target plant surface. Increasing the viscosity of the pesticide solution is one of the key ways to regulate droplet behavior: increased viscosity alters the liquid film rupture process, increases droplet size, slows evaporation rates, and enhances droplet retention on the target surface. For most herbicides that need to penetrate plant tissues to exert their effects, absorption and penetration efficiency are crucial. Tank-mix adjuvants not only optimize the absorption and penetration process by increasing the contact area and retention time between the pesticide solution and the leaf surface, but some adjuvants can also dissolve or destroy the waxy layer of the leaf epidermis, reducing the barrier effect of the cuticle, thereby promoting pesticide absorption and achieving the ultimate goal of synergistic effects with reduced pesticide use. However, existing adjuvants have problems such as limited improvement in herbicide efficacy, poor resistance to rain washout, and numerous negative environmental impacts. Therefore, there is an urgent need to provide a herbicide adjuvant to solve the above technical problems. Summary of the Invention

[0007] To address the problems of inadequate weed control, environmental pollution, and increased weed resistance caused by the extensive use of chemical pesticides in existing technologies, this invention provides a herbicide synergist tank-mix adjuvant for controlling weeds, especially noxious weeds, in crop fields, along with its preparation method and application. This herbicide synergist improves the physical properties of the herbicide solution, promotes droplet deposition and penetration on the target surface, and enhances the solution's resistance to rain washout, thereby effectively improving the herbicide's control effect on weeds in the field. While ensuring improved efficacy, this invention can reduce the amount of herbicide used per unit area, thus reducing negative environmental impacts and slowing down the evolution of weed resistance.

[0008] This invention is composed of three functional components, which have functions such as surface activity regulation, drug solution stability, adhesion retention and penetration enhancement. Due to differences in hydrophilic / hydrophobic properties, ionic characteristics and interfacial activity, each component can affect the behavior of the drug solution on the target surface from multiple aspects.

[0009] Taurine is a small-molecule organic compound containing sulfonic acid and amino groups. It is highly polar and has good water solubility. In compound systems, it mainly plays an auxiliary role in adjusting solution polarity, improving system stability, and enhancing component compatibility. To date, there are few studies on its direct use as a herbicide spray adjuvant.

[0010] Sodium dodecylphenol-formaldehyde dimer sulfonate belongs to the alkylphenol-formaldehyde condensate sulfonate anionic surfactant class. Its molecular structure combines a hydrophobic alkyl aromatic structure with a hydrophilic sulfonate group, exhibiting typical amphiphilicity. In this invention, this type of sulfonate surfactant can reduce the surface tension of the system and improve the wetting and spreading ability of drug droplets on hydrophobic leaf surfaces through adsorption at gas / liquid and solid / liquid interfaces.

[0011] Ethoxylated triglycerides are nonionic surfactants derived from oils and fats, containing both hydrophilic polyoxyethylene chains and hydrophobic fatty acid chains in their molecules. In this invention, oil-based adjuvants containing nonionic surfactants can affect the deposition morphology of the pesticide solution, cuticle penetration, and residue after rainwater rinsing. Therefore, they are key components in this adjuvant for improving pesticide adhesion, retention, and leaf spread.

[0012] In this invention, the dodecylphenol-formaldehyde dimer sodium sulfonate, ethoxylated triglycerides, and taurine are not simply additive components, but rather work synergistically through multiple processes—reducing surface tension, enhancing adhesion and retention, and regulating polarity to promote penetration—to form a complete chain of regulation over the behavior of the herbicide solution. This compound system improves the wetting and spreading properties of the herbicide solution on hydrophobic leaf surfaces, delays droplet evaporation, enhances resistance to rain washout, and promotes the penetration and absorption of the active ingredient, thereby significantly improving the herbicide efficacy and achieving the goal of reducing application rate while maintaining the same efficacy. The complementary interaction of the three components in terms of time and space produces a synergistic effect that is not found in single-component or arbitrary two-component combinations.

[0013] To achieve the above objectives, the present invention adopts the following technical solution.

[0014] A herbicide synergist comprises taurine, sodium dodecylphenol-formaldehyde dimer sulfonate, ethoxylated triglycerides, and deionized water.

[0015] Furthermore, the herbicide synergist comprises the following components in weight percentage: 3-5% taurine, 15-40% sodium dodecylphenol-formaldehyde dimer sulfonate, 45-55% ethoxylated triglycerides, and the remainder being deionized water.

[0016] The herbicide synergist of the present invention comprises the following components by weight percentage: taurine 3%, sodium dodecylphenol-formaldehyde dimer sulfonate 15%, ethoxylated triglycerides 45%, and deionized water to make up to 100%.

[0017] Further optimization yielded the following components by weight percentage: taurine 5%, sodium dodecylphenol-formaldehyde dimer sulfonate 40%, ethoxylated triglycerides 55%, and deionized water to make up to 100%.

[0018] Further optimization yielded the following weight percentages for each component: taurine 5%, sodium dodecylphenol-formaldehyde dimer sulfonate 30%, ethoxylated triglycerides 50%, and deionized water to make up to 100%.

[0019] The preparation method of the herbicide synergist includes the following steps: taurine, sodium dodecylphenol-formaldehyde dimer sulfonate, ethoxylated triglycerides and deionized water are added to a stirred tank and stirred evenly at a stirring speed of 60~120 r / min for 10~30 minutes; after stirring, the resulting system is a uniform, transparent or semi-transparent liquid phase, without layering, precipitation and visible suspended matter.

[0020] The herbicides are selected from the following categories: sulfonylurea herbicides (such as mesosulfuron-methyl), substituted urea herbicides (such as isoproturon), aryloxyphenoxypropionate herbicides (such as clodinafop-propionate and quizalofop-p-ethyl), benzoylcyclohexanedione herbicides (such as mesosulfuron-methyl), amide herbicides (such as propargite), triazolidinesulfonamide herbicides (such as penflusulfonamide), imidazolinone herbicides (such as methoxyfenozide), and organophosphorus herbicides (such as glyphosate).

[0021] After the herbicide synergist is mixed evenly with water, the herbicide is then added evenly.

[0022] The present invention also provides the application of the above-mentioned herbicide synergist in the control of weeds in crop fields.

[0023] Furthermore, the above-mentioned herbicide synergist is diluted at a ratio of 1:500~1500, then mixed evenly with the herbicide and sprayed.

[0024] Furthermore, the herbicide is one or more of the following: 30 g / L mesosulfuron-methyl oil suspension concentrate, 50% isoproturon suspension concentrate, 15% clodinafop-propargyl emulsifiable concentrate, 10% quizalofop-p-ethyl emulsifiable concentrate, 40% mesosulfuron-methyl suspension concentrate, 34% propargite emulsifiable concentrate, 25 g / L penflusulfonamide oil suspension concentrate, 4% methoxyfenozide smoked water concentrate, and glyphosate technical grade.

[0025] Furthermore, the weeds are one or more of the following: barnyard grass, wild geranium, barnyard grass, weedy rice, crabgrass, amaranth, and alligator weed.

[0026] The present invention also provides the application of the above-mentioned herbicide synergist in improving the wetting and spreading ability of herbicides.

[0027] The present invention also provides the application of the above-mentioned herbicide synergist in reducing the amount of herbicide used.

[0028] The present invention also provides the application of the above-mentioned herbicide synergist in improving the resistance of herbicides to rain washout.

[0029] The present invention also provides the application of the above-mentioned herbicide synergist in improving the weed control effect.

[0030] Beneficial effects

[0031] (1) The herbicide synergist provided by the present invention for eliminating weeds in crop fields can increase the wetting and spreading ability of the herbicide on weeds and increase the absorption and conduction of the herbicide in weeds, thereby significantly improving the activity of the herbicide in killing weeds. When the herbicide synergist of the present invention is used in combination with the herbicide, it can achieve the effect of increasing efficacy and reducing pesticide use.

[0032] (2) The herbicide synergist provided by the present invention for eliminating weeds in crop fields can enhance the herbicide's ability to withstand rain washout when applied during the rainy season, improve the herbicide utilization rate, thereby solving the pollution problem caused by excessive application and slowing down the resistance of weeds.

[0033] (3) Taurine has strong water solubility, which enables the solution to achieve emulsification and has a good effect on improving the foaming amount of the solution; sodium dodecylphenol-formaldehyde dimer sulfonate belongs to the alkylphenol-formaldehyde condensate sulfonate anionic surfactant. The molecular structure of this type of substance usually contains both hydrophobic alkyl aromatic structure and hydrophilic sulfonate group, thus exhibiting typical amphiphilic characteristics; ethoxylated triglycerides have good lipophilicity and spreading and penetrating properties, which can enhance the compatibility between the solution and the leaf wax layer, promote the uniform distribution and deep penetration of the active ingredients on the leaf surface, reduce solution loss, and improve the adhesion and utilization rate of the agent on the plant surface. The above components improve the wetting and spreading ability of the solution, increase the retention and adhesion of the solution on the leaf surface, and carry the solution into the plant wax layer, carrying the active ingredients in the plant protection product to quickly penetrate through the plant epidermis and enter the plant to exert their effects, thereby achieving the purpose of improving the efficacy. The herbicide synergist provided by this invention for the control of weeds in crop fields is safe for humans, crops and the environment.

[0034] In summary, the herbicide synergist of the present invention, when used in combination with herbicides, can significantly improve the efficacy of chemical herbicides; under the same control effect conditions, the dosage is reduced compared to using herbicides alone; the herbicide synergist of the present invention, when used in combination with herbicides, is safe for crops, ultimately achieving the effects of reducing pesticide costs, reducing environmental pollution, and slowing down the development of weed resistance. Attached Figure Description

[0035] Figure 1 These are comparative photographs of the adjuvant droplets on the front of barnyard grass leaves in Examples 1-3;

[0036] Figure 2 These are comparative photographs of the adjuvant droplets in Examples 1-3 on the reverse side of barnyard grass leaves;

[0037] Figure 3This is the dose-response curve of methoxyfenozide-rice weed;

[0038] Figure 4 It is the dose-response curve of penoxsulam-barnyardgrass;

[0039] Figure 5 This is the dose-response curve of isoproturon-geranium;

[0040] Figure 6 This is the dose-response curve of clodinafop-ryegrass;

[0041] Figure 7 This is the dose-response curve of quizalofop-p-ethyl;

[0042] Figure 8 This is the dose-response curve of nicosulfuron-arabinose;

[0043] Figure 9 This is a diagram showing the synergistic effect of herbicide adjuvants on the control of weeds in rice by methoxyfenozide.

[0044] Figure 10 This is a diagram showing the synergistic effect of herbicide adjuvants on penflusulfonamide in controlling barnyardgrass;

[0045] Figure 11 This is a diagram illustrating the synergistic effect of herbicide adjuvants on isoproturon in controlling Geranium wilfordii.

[0046] Figure 12 This is a diagram showing the synergistic effect of herbicide adjuvants on the control of Lernus martensii by clodinafop-propargyl.

[0047] Figure 13 This is a comparison of phytotoxicity symptoms after applying a pesticide to control barnyard grass and being exposed to rain for 3 days;

[0048] Figure 14 This is a comparison of phytotoxicity symptoms of penoxsulam after being exposed to rain for 3 days following application;

[0049] Figure 15 This is a comparison of phytotoxicity symptoms 7 days after applying a pesticide to control barnyard grass and being exposed to rain.

[0050] Figure 16 This is a comparison of phytotoxicity symptoms 7 days after penoxsulam was applied to control barnyardgrass and then exposed to rain.

[0051] Figure 17 This is a comparison of phytotoxicity symptoms 14 days after applying the herbicide to control barnyard grass;

[0052] Figure 18 This is a comparison of phytotoxicity symptoms 14 days after penoxsulam was applied and then exposed to rain.

[0053] Figure 19 Symptoms of herbicide damage to various parts of Alternanthera philoxeroides treated with glyphosate 7 days after application;

[0054] Figure 20 Seven days after application, glyphosate plus adjuvants were used to treat the phytotoxicity symptoms in various parts of Alternanthera philoxeroides.

[0055] Figure 21 Symptoms of herbicide damage to various parts of Alternanthera philoxeroides treated with glyphosate 14 days after application;

[0056] Figure 22 The symptoms of herbicide damage in various parts of Alternanthera philoxeroides were observed 14 days after the application of glyphosate and adjuvants.

[0057] Figure 23 This is a comparison of phytotoxicity symptoms 21 days after mesosulfuron-methyl was used to control sphagnum moss.

[0058] Figure 24 This is a comparison of phytotoxicity symptoms 30 days after mesosulfuron-methyl was used to control sphagnum moss.

[0059] Figure 25 This is a comparison of phytotoxicity symptoms 45 days after mesosulfuron-methyl was used to control sphagnum moss.

[0060] Figure 26 This is a comparison of the symptoms of herbicide damage 7 days after using barnyard grass to control barnyard grass;

[0061] Figure 27 This is a comparison of the symptoms of herbicide damage 15 days after using barnyard grass to control barnyard grass;

[0062] Figure 28 This is a comparison of the symptoms of herbicide damage 30 days after using barnyard grass to control barnyard grass. Detailed Implementation

[0063] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0064] Example 1

[0065] Effect of Formulation 1 Herbicide Synergist on the Contact Angle of Penflusulfonium on Barnyardgrass Leaves

[0066] Herbicide synergist formulation: 3% taurine, 15% sodium dodecylphenol-formaldehyde dimer sulfonate, 45% ethoxylated triglycerides, and deionized water to make up to 100%. Preparation method: Add taurine, sodium dodecylphenol-formaldehyde dimer sulfonate, and deionized water to a stirred tank and stir at 100 r / min for 20 minutes until homogeneous. After stirring, the resulting system is a uniform, transparent or semi-transparent liquid phase, without stratification, precipitation, or visible suspended matter.

[0067] Test agent: The herbicide selected was 25 g / L penoxsulam dispersible oil suspension (Anhui Shengdan Biochemical Co., Ltd.);

[0068] The herbicide synergist is diluted with water at a ratio of 1500:20. The volume ratio of penoxsulam dispersible oil suspension to the herbicide synergist is 47:20. First, dilute the herbicide synergist with water at a ratio of 1500:20, and then add the penoxsulam herbicide to the diluted solution.

[0069] The weeds tested: barnyard grass;

[0070] Test method: Using a contact angle measuring instrument JC2000C1B (Shanghai Zhongchen Digital Technology Equipment Co., Ltd.);

[0071] Four treatments were set up: I: pure water; II: 1500 times herbicide synergist (Example 1); III: penoxsulam; IV: penoxsulam + 1500 times herbicide synergist (Example 1), and the contact angle of droplets on the front and back of barnyard grass leaves was measured.

[0072] Table 1. Contact angle of droplets on barnyard grass leaves in Example 1

[0073]

[0074] The results in Table 1 show that the addition of herbicide synergists significantly reduced the contact angle of droplets on both the front and back of barnyard grass leaves. Herbicide synergists improved the physical properties of herbicide droplets, enhanced their wetting and spreading ability, and increased herbicide utilization.

[0075] Example 2

[0076] Effect of Formulation 2 Herbicide Synergist on the Contact Angle of Penflusulfonium on Barnyardgrass Leaves

[0077] Herbicide synergist formulation: 5% taurine, 40% sodium dodecylphenol-formaldehyde dimer sulfonate, 55% ethoxylated triglycerides, and deionized water to make up to 100%. Preparation method: Add taurine, sodium dodecylphenol-formaldehyde dimer sulfonate, and deionized water to a stirred tank and stir at 100 r / min for 20 minutes until homogeneous. After stirring, the resulting system is a uniform, transparent or semi-transparent liquid phase, without stratification, precipitation, or visible suspended matter.

[0078] The test agent, dilution amount, ratio of herbicide to adjuvant, mixing method, and test weeds were the same as in Example 1;

[0079] Test method: Using a contact angle measuring instrument JC2000C1B (Shanghai Zhongchen Digital Technology Equipment Co., Ltd.)

[0080] Four treatments were set up: I: pure water; II: 1500 times herbicide synergist (Example 2); III: penoxsulam; IV: penoxsulam + 1500 times herbicide synergist (Example 2), and the contact angle of droplets on the front and back of barnyard grass leaves was measured.

[0081] Table 2. Contact angle of droplets on barnyard grass leaves in Example 2

[0082]

[0083] The results in Table 2 show that the addition of herbicide synergist significantly reduced the contact angle of droplets on both the front and back of barnyard grass leaves. The herbicide synergist improved the physical properties of herbicide droplets, enhanced wetting and spreading ability, and improved herbicide utilization, showing better results than in Example 1.

[0084] Example 3

[0085] Effect of Formulation 3 Herbicide Synergist on the Contact Angle of Penflusulfonium on Barnyardgrass Leaves

[0086] Herbicide synergist formulation: 5% taurine, 30% sodium dodecylphenol-formaldehyde dimer sulfonate, 50% ethoxylated triglycerides, and deionized water to make up to 100%. Preparation method: Add taurine, sodium dodecylphenol-formaldehyde dimer sulfonate, ethoxylated triglycerides, and deionized water to a stirred tank and stir at 100 r / min for 20 minutes until homogeneous. After stirring, the resulting system is a uniform, transparent or semi-transparent liquid phase, without stratification, precipitation, or visible suspended matter.

[0087] The test agent, dilution amount, ratio of herbicide to adjuvant, mixing method, and test weeds were the same as in Example 1;

[0088] Test method: Use contact angle measuring instrument JC2000C1B (Shanghai Zhongchen Digital Technology Equipment Co., Ltd.).

[0089] Four treatments were set up: I: pure water; II: 1500 times herbicide synergist (Example 3); III: penoxsulam; IV: penoxsulam + 1500 times herbicide synergist (Example 3), and the contact angle of droplets on the front and back of barnyard grass leaves was measured.

[0090] Table 3. Contact angle of droplets on barnyard grass leaves in Example 3

[0091]

[0092] The results in Table 3 show that the addition of herbicide synergist significantly reduced the contact angle of droplets on both the front and back of barnyard grass leaves. The herbicide synergist improved the physical properties of herbicide droplets, enhanced wetting and spreading ability, and improved herbicide utilization. The effect was not significantly different from that in Example 2. According to the formulation of Example 3, the content of the herbicide synergist was reduced. The herbicide synergist formulation in Example 3 was the most economical.

[0093] Comparative Example 1

[0094] A herbicide synergist, formulation: 5% taurine, made up to 100% with deionized water. Preparation method: Taurine and deionized water are added to a stirred tank and stirred evenly at a stirring speed of 100 r / min for 20 minutes; after stirring, the resulting system is a homogeneous, transparent or semi-transparent liquid phase, without layering, precipitation, or visible suspended matter.

[0095] The test reagent, dilution amount, and test weeds were the same as in Example 1;

[0096] Test method: Using a contact angle measuring instrument JC2000C1B (Shanghai Zhongchen Digital Technology Equipment Co., Ltd.);

[0097] Four treatments were set up: I: 1500 times herbicide synergist (Comparative Example 1); II: 1500 times herbicide synergist (Example 3); III: penoxsulam + 1500 times herbicide synergist (Comparative Example 1); IV: penoxsulam + 1500 times herbicide synergist (Example 3). The contact angle of the droplets on the front and back of the barnyard grass leaves was measured.

[0098] Table 4. Contact angle of droplet on barnyard grass leaf in Comparative Example 1

[0099]

[0100] Table 4 shows that the contact angles of the herbicide synergist droplets in Comparative Example 1 on both the front and back surfaces of barnyard grass leaves were significantly higher than those in Example 3. The contact angles of the droplets from Comparative Example 1, after being mixed with the herbicide penoxsulam, were also significantly higher on both the front and back surfaces of barnyard grass leaves than those in Example 3. Therefore, taurine alone has poor wetting effect on the herbicide solution, while the synergistic effect of taurine, sodium dodecylphenol-formaldehyde dimer sulfonate, and ethoxylated triglycerides provides better wetting.

[0101] Comparative Example 2

[0102] A herbicide synergist, formulation: 30% sodium dodecylphenol-formaldehyde dimer sulfonate, supplemented with deionized water to 100%. Preparation method: Taurine and deionized water are added to a stirred tank and stirred evenly at a stirring speed of 100 r / min for 20 minutes; after stirring, the resulting system is a homogeneous, transparent or semi-transparent liquid phase, without stratification, precipitation, or visible suspended matter.

[0103] The test reagent, dilution amount, and test weeds were the same as in Example 1;

[0104] Test method: Using a contact angle measuring instrument JC2000C1B (Shanghai Zhongchen Digital Technology Equipment Co., Ltd.);

[0105] Four treatments were set up: I: 1500 times herbicide synergist (Comparative Example 2); II: 1500 times herbicide synergist (Example 3); III: penoxsulam + 1500 times herbicide synergist (Comparative Example 2); IV: penoxsulam + 1500 times herbicide synergist (Example 3). The contact angle of the droplets on the front and back of the barnyard grass leaves was measured.

[0106] Table 5. Contact angle of droplets on barnyard grass leaves in Comparative Example 2

[0107]

[0108] Table 5 shows that the contact angle of the herbicide synergist droplets in Comparative Example 2 on the front side of barnyard grass leaves was significantly higher than that in Example 3; the contact angles of the droplets from Comparative Example 2, after being mixed with the herbicide penoxsulam, on both the front and back sides of barnyard grass leaves were significantly higher than those in Example 3. Therefore, the single component of dodecylphenol-formaldehyde dimer sodium sulfonate has poor wetting effect on the herbicide solution, while the herbicide synergist with taurine, dodecylphenol-formaldehyde dimer sodium sulfonate, and ethoxylated triglycerides has a better wetting effect.

[0109] Comparative Example 3

[0110] A herbicide synergist, formulation: 50% ethoxylated triglycerides, made up to 100% deionized water. Preparation method: Ethoxylated triglycerides and deionized water are added to a stirred tank and stirred evenly at a stirring speed of 100 r / min for 20 minutes; after stirring, the resulting system is a homogeneous, transparent or semi-transparent liquid phase, without layering, precipitation, or visible suspended matter.

[0111] The test reagent, dilution amount, and test weeds were the same as in Example 1;

[0112] Test method: Using a contact angle measuring instrument JC2000C1B (Shanghai Zhongchen Digital Technology Equipment Co., Ltd.);

[0113] Four treatments were set up: I: 1500 times herbicide synergist (Comparative Example 3); II: 1500 times herbicide synergist (Example 3); III: penoxsulam + 1500 times herbicide synergist (Comparative Example 3); IV: penoxsulam + 1500 times herbicide synergist (Example 3). The contact angle of the droplets on the front and back of the barnyard grass leaves was measured.

[0114] Table 6. Contact angle of droplets on barnyard grass leaves in Comparative Example 2

[0115]

[0116] Table 6 shows that the contact angle of the herbicide synergist droplets in Comparative Example 3 on the front surface of barnyard grass leaves was significantly higher than that in Example 3; the contact angle of the droplets from Comparative Example 3, after being mixed with the herbicide penoxsulam, on the front surface of barnyard grass leaves was also significantly higher than that in Example 3. Therefore, the single ethoxylated triglyceride component has poor wetting effect on the herbicide solution, while the synergistic effect of taurine, sodium dodecylphenol-formaldehyde dimer sulfonate, and ethoxylated triglycerides on the herbicide synergist is better.

[0117] Comparative Example 4

[0118] A herbicide synergist, with the same formulation as in Example 3;

[0119] The test agent and the test weeds are the same as in Example 1;

[0120] The herbicide synergist (Example 3) was diluted with water at dilutions of 250, 500, 1500, and 2000 times, respectively. The volume ratios of penoxsulam dispersible oil suspension to the herbicide synergist were 47:120, 47:60, 47:20, and 47:15, respectively. The herbicide synergist (Example 3) was first diluted with water, and then penoxsulam was added to the diluted solution.

[0121] Test method: Use contact angle measuring instrument JC2000C1B (Shanghai Zhongchen Digital Technology Equipment Co., Ltd.).

[0122] Four treatments were set up: I: penoxsulam; II: penoxsulam + 250 times herbicide synergist (Example 3); III: penoxsulam + 500 times herbicide synergist (Example 3); IV: penoxsulam + 1500 times herbicide synergist (Example 3); V: penoxsulam + 2000 times herbicide synergist (Example 3). The contact angle of the droplets on the front and back of the barnyard grass leaves was measured.

[0123] Table 7. Contact angles of droplets at different dilution ratios on barnyard grass leaves in Example 3.

[0124]

[0125] Table 7 shows that the contact angles of droplets on both sides of barnyard grass leaves after mixing with penflusulfonium herbicide in the 250, 500, 1500, and 2000 times dilution herbicide synergist adjuvants (Example 3) were significantly lower than those of penflusulfonium herbicide alone. There was no significant difference in the contact angles of droplets on the underside of barnyard grass leaves after mixing with penflusulfonium herbicide in the 250, 500, 1500, and 2000 times dilution herbicide synergist adjuvants (Example 3). The contact angles of droplets on the front side of barnyard grass leaves after mixing with penflusulfonium herbicide in the 250, 500, and 1500 times dilution herbicide synergist adjuvants (Example 3) were significantly lower than those in the 2000 times dilution treatment, indicating better wettability. Since the effect of the 2000-fold herbicide synergist (Example 3) is not as good as other dilution ratios, and the cost of 250-fold is relatively high, the recommended dilution ratio of the herbicide synergist (Example 3) is 500-1500 times.

[0126] Example 4

[0127] Evaluation of the synergistic effect of herbicide adjuvants on the control of rice weeds by methoxyfenozide.

[0128] Test agent: 4% methoxyfenozide aqueous solution (Jiangsu Zhongqi Technology Co., Ltd.) was selected as the herbicide.

[0129] The herbicide synergist was formulated according to Example 3, with the volume ratio of synergist to water being 1:1500.

[0130] The weed tested was weedy rice.

[0131] Application method: The comparative example was sprayed on weedy rice according to the dosage gradient of 0, 32, 48, 90, 135, 270, and 318 g ai / ha of methoxyfenozide. The example was sprayed according to the same concentration of tank-mixed herbicide synergist. The herbicide was sprayed evenly onto the potted plants, and diluted with 30L of water per acre.

[0132] Experimental Methods: Phytotoxicity symptoms were recorded and graded after application, and the overall efficacy index was calculated. Logistic regression curves of dose and 1-efficacy index were generated using Origin 2021 analysis software to calculate the effect of ED. 50 and ED 90 (ED) 50 and ED 90 (These represent the doses required to achieve an overall efficacy index inhibition rate of 50% and 90%, respectively), and calculate the ED. 50 Reduction rate and ED 90 Reduction rate.

[0133] Overall efficacy index = ∑[(Number of plants at each phytotoxicity level per treatment × Level) / (Total number of plants per treatment × Highest level)] * 100%

[0134] ED 50Reduction rate = (EDS of the herbicide used alone to treat this weed) 50 Value - ED50 of the herbicide and adjuvant mixture used to treat this weed 50 Value) / ED of the herbicide when used alone to treat this weed 50 value * 100%

[0135] ED 90 Reduction rate = (EDS of the herbicide used alone to treat this weed) 90 Value - ED50 of the herbicide and adjuvant mixture used to treat this weed 90 Value) / ED of the herbicide when used alone to treat this weed 90 value * 100%

[0136] Table 8 Methoxymethyl nicotine-weed rice ED 50 and ED 90 Values ​​and their reduction rates

[0137]

[0138] like Figure 3 and Figure 9 As shown, the results indicate that the combination of methoxyfenozide and herbicide synergist has better phytotoxicity and control effect on weedy rice than the treatment with methoxyfenozide alone. This demonstrates that the herbicide synergist of the present invention can enhance the control effect of methoxyfenozide on weedy rice, and can reduce the amount of herbicide used while achieving the same control effect, thus having the advantage of synergistic effect and reduced dosage.

[0139] Table 8 shows that adding herbicide synergist can increase the control efficacy of methoxyfenozide against rice weeds. 50 and ED 90 The synergistic effects were 12.79% and 17.67%, respectively. When the herbicide caused 50% damage to weedy rice, the adjuvant reduced the commercial application rate of methoxyfenozide by 351 mL per hectare; when the herbicide caused 90% damage to weedy rice, the adjuvant reduced the commercial application rate of methoxyfenozide by 1686 mL per hectare.

[0140] Example 5

[0141] Evaluation of the synergistic effect of herbicide adjuvants on penflusulfonamide in controlling barnyardgrass

[0142] Test reagent: The herbicide selected was 25 g / L penflusulfonamide dispersible oil suspension (Anhui Shengdan Biochemical Co., Ltd.).

[0143] The herbicide synergist was formulated according to Example 3, with the volume ratio of synergist to water being 1:1500.

[0144] The weed tested was barnyard grass.

[0145] Application method: The comparative example was sprayed on barnyardgrass according to the dosage gradient of penoxsulam 0, 8.81, 17.63, 35.25, 70.5, 141, 282 g ai / ha. The example was sprayed according to the same concentration of tank-mixed herbicide synergist. The herbicide was sprayed evenly onto the potted plants, diluted with 30L of water per acre.

[0146] The amount of water and the method of application are the same as in Example 4.

[0147] Table 9. Penflusulfonamide-barnyardgrass EDTA 50 and ED 90 Values ​​and their reduction rates

[0148]

[0149] like Figure 4 and Figure 10 As shown, the results indicate that the combination of penoxsulam and herbicide synergist resulted in better phytotoxicity and control of barnyard grass than penoxsulam alone, with more pronounced barnyard grass symptoms. This demonstrates that the herbicide synergist of this invention can enhance the control effect of penoxsulam on barnyard grass, and can reduce the amount of herbicide used while achieving the same control effect, thus exhibiting the advantages of synergistic effect and reduced dosage.

[0150] Table 9 shows that adding herbicide synergist can increase the control efficacy of penoxsulam against barnyardgrass. 50 and ED 90 The synergistic effects were 25.01% and 31.82%, respectively. For 50% damage to barnyard grass, the adjuvant reduced the commercial application rate of penoxsulam by 501g per hectare; for 90% damage to barnyard grass, the adjuvant reduced the commercial application rate of penoxsulam by 2568g per hectare.

[0151] Example 6

[0152] Evaluation of the synergistic effect of herbicide adjuvants on isoproturon in controlling geranium

[0153] Test agent: 50% isoproturon suspension (Yangzhou Suling Pesticide & Chemical Co., Ltd.) was selected as the herbicide.

[0154] The herbicide synergist was formulated according to Example 3, with the volume ratio of synergist to water being 1:1500.

[0155] The weed tested was Geranium wilfordii.

[0156] Application method: The comparative example was sprayed with weedy rice according to the dosage gradient of isoproturon 0, 750, 1500, 3000, 6000, 12000, and 24000 g ai / ha. The example was sprayed with the same concentration of tank-mixed herbicide synergist. The mixture was evenly sprayed onto the potted plants, diluted with 30L of water per acre.

[0157] The amount of water and the method of application are the same as in Example 4.

[0158] Table 10 Isoproturon-Geranium ED 50 and ED 90 Values ​​and their reduction rates

[0159]

[0160] like Figure 5 and Figure 11 As shown, the results indicate that the control effect of isoproturon mixed with the herbicide synergist on geranium is significantly better than that of isoproturon alone. This demonstrates that the herbicide synergist of the present invention can enhance the control effect of isoproturon on broadleaf weeds, improve the utilization efficiency of isoproturon, and reduce the amount of herbicide used while achieving the same control effect, thus having the advantage of synergistic effect and reduced dosage.

[0161] Table 10 shows that adding herbicide synergist can increase the control efficacy of isoproturon against Geranium wilfordii. The herbicide synergist ED... 50 and ED 90 The synergistic effects were 16.57% and 27.23%, respectively. For 50% phytotoxicity to Geranium, the adjuvant reduced the commercial application rate of isoproturon by 970 ml per hectare; for 90% phytotoxicity to Geranium, the adjuvant reduced the commercial application rate of isoproturon by 3874 ml per hectare.

[0162] Example 7

[0163] Evaluation of the synergistic effect of herbicide adjuvants on the control of Lernurum perfringens by clodinafop-propargyl

[0164] Test agent: 15% clodinafop-propargyl emulsion (Jiangsu Renxin Crop Protection Technology Co., Ltd.) was selected as the herbicide.

[0165] The herbicide synergist was formulated according to Example 3, with the volume ratio of synergist to water being 1:1500.

[0166] The tested weed was *Lysimachia nummularia*.

[0167] Application method: The comparative example was sprayed on weedy rice according to the dosage gradient of 0, 33.75, 67.5, 135, 270, 540 and 1080 g ai / ha of clodinafop-propargyl. The example was sprayed according to the same concentration of tank-mixed herbicide synergist. The mixture was evenly sprayed onto the potted plants and diluted with 30L of water per acre.

[0168] The amount of water and the method of application are the same as in Example 4.

[0169] Table 11. Clothiamethoxam-Lycium oryzae EDTA 50 and ED 90 Values ​​and their reduction rates

[0170]

[0171] like Figure 6 and Figure 12 As shown, the results indicate that when clodinafop-propargyl is mixed with the herbicide synergist, the herbicide damage symptoms of ryegrass are more obvious, and the control effect is better than that of clodinafop-propargyl alone. This shows that the herbicide synergist of the present invention can promote the deposition and efficacy of the herbicide on the leaves of weeds, and improve the control effect of clodinafop-propargyl on grass weeds.

[0172] Table 11 shows that adding herbicide synergist can increase the control efficacy of clodinafop-propargyl against Lorrae rubra. 50 and ED 90 The reduction rates reached 20.85% and 31.92%, respectively. For 50% phytotoxicity in *Lolium perfoliatum*, the adjuvant reduced the commercial application rate of clodinafop-propargyl by 160 ml per hectare; for 90% phytotoxicity in *Lolium perfoliatum*, the adjuvant reduced the commercial application rate of clodinafop-propargyl by 761 ml per hectare.

[0173] Example 8

[0174] Evaluation of the synergistic effect of herbicide adjuvants on the control of barnyardgrass in quizalofop-p-ethyl.

[0175] Test agent: 10% quizalofop-P-ethyl EC (Jinan Zhongke Green Biotechnology Co., Ltd.) was selected as the herbicide.

[0176] The herbicide synergist was formulated according to Example 3, with the volume ratio of synergist to water being 1:1500.

[0177] The weed tested was crabgrass.

[0178] Application method: The comparative example was sprayed on weedy rice according to the dosage gradient of quizalofop-P-ethyl 0, 30, 60, 120, 240, 480, and 960 g ai / ha. The example was sprayed according to the same concentration of tank-mixed herbicide synergist. The mixture was evenly sprayed onto the potted plants and diluted with 30 L of water per acre.

[0179] The amount of water and the method of application are the same as in Example 4.

[0180] Table 12 Quizalofop-P-ethyl - Crataegus pinnatifida ED 50 and ED 90 Values ​​and their reduction rates

[0181]

[0182] like Figure 7As shown, the results indicate that the dose-response effect of quizalofop-P-ethyl mixed with the herbicide synergist on barnyardgrass is better than that of quizalofop-P-ethyl alone; this demonstrates that the herbicide synergist of the present invention can improve the control efficacy of quizalofop-P-ethyl on barnyardgrass and can reduce the amount of herbicide used while ensuring the control efficacy.

[0183] Table 12 shows that adding a herbicide synergist can increase the control efficacy of quizalofop-P-ethyl against barnyardgrass. The herbicide synergist ED... 50 and ED 90 The reduction rates reached 20.33% and 25.54%, respectively. For 50% damage to crabgrass, the adjuvant reduced the commercial application rate of quizalofop-P-ethyl by 372 ml per hectare; for 90% damage to crabgrass, the adjuvant reduced the commercial application rate of quizalofop-P-ethyl by 1354 ml per hectare.

[0184] Example 9

[0185] Evaluation of the synergistic effect of herbicide adjuvants on the control of Amaranthus retroflexus by mesotrione

[0186] Test agent: 40% nicosulfuron suspension (Zhejiang Xin'an Chemical Group Co., Ltd.) was selected as the herbicide.

[0187] The herbicide synergist was formulated according to Example 3, with the volume ratio of synergist to water being 1:1500.

[0188] The weed tested was Amaranthus retroflexus.

[0189] Application method: The comparative example was sprayed on weedy rice according to the dosage gradient of 0, 90, 180, 360, 720, 1440, and 2880 g ai / ha of nicosulfuron. The example was sprayed according to the same concentration of tank-mixed herbicide synergist. The mixture was evenly sprayed onto the potted plants, diluted with 30L of water per acre.

[0190] The amount of water and the method of application are the same as in Example 4.

[0191] Table 13 Nisosulfuron-Amaranthus retroflexus ED 50 and ED 90 Values ​​and their reduction rates

[0192]

[0193] like Figure 8 As shown, the results indicate that the control effect of nicosulfuron mixed with the herbicide synergist on amaranth is better than that of nicosulfuron alone. This shows that the herbicide synergist of the present invention can enhance the herbicidal activity of nicosulfuron against broadleaf weeds, and can reduce the amount of herbicide used while achieving the same control effect, thus having the advantage of synergistic effect and reduced dosage.

[0194] Table 13 shows that adding herbicide synergist can increase the control efficacy of nicosulfuron against Amaranthus retroflexus. 50 and ED 90 The reduction rates reached 14.95% and 7.77%, respectively. For 50% phytotoxicity of amaranth, the adjuvant reduced the commercial application rate of mesotrione by 190 ml per hectare; for 90% phytotoxicity of amaranth, the adjuvant reduced the commercial application rate of mesotrione by 233 ml per hectare.

[0195] Example 10

[0196] Comparative efficacy test of herbicide synergist adjuvants against rain washout

[0197] Test agents: 34% propargite EC (Shenyang Fengshou Pesticide Co., Ltd., Liaoning Province) and 25 g / L penflusulfonamide SC (Anhui Shengdan Biochemical Co., Ltd.) were selected as herbicides.

[0198] The herbicide synergist was formulated according to Example 3, with a volume ratio of synergist to water of 1:1500. The tested weed was barnyard grass.

[0199] Application method: Spray barnyardgrass with a concentration of 822 mL / mu and penoxsulam at a concentration of 47 ml / mu. Spray evenly onto potted plants. Compared with the control group, the herbicide was used alone. In this example, a herbicide synergist was added. Dilute with 30 L of water per mu.

[0200] Experimental method: Rainfall was simulated at 1, 3, and 6 hours after spraying using simulation equipment from Jiangsu Yuno Electronic Technology Co., Ltd., with a standard rainfall of 80 mm / hour for 30 minutes. Control efficacy per plant and fresh weight efficacy at 14 days post-spraying were investigated.

[0201] Table 14. Control efficacy of barnyard grass after different levels of rainwater rinsing.

[0202]

[0203] like Figure 13-18 As shown, the results indicate that under different rain conditions, barnyardgrass treated with both propargite and penoxsulam with added herbicide synergist exhibited more pronounced phytotoxicity symptoms and better control effects than herbicide-only treatments under the same conditions. This demonstrates that the herbicide synergist of this invention can enhance the adhesion and retention of the herbicide solution on the surface of weed leaves, reduce the loss of efficacy caused by rainwater erosion, and thus significantly improve the herbicide's resistance to rainwater erosion.

[0204] The results in Table 14 show that the addition of herbicide synergists significantly improved the control efficacy of propanil against barnyard grass and significantly enhanced the herbicide's resistance to rain washout.

[0205] Table 15. Barnyardgrass control efficacy after penflusulfonamide was washed away by different levels of rainwater.

[0206]

[0207] The results in Table 15 show that the addition of herbicide synergist significantly improved the control efficacy of penflusulfonium against barnyardgrass, and the herbicide synergist significantly improved the herbicide's resistance to rain washout.

[0208] Example 11

[0209] Effects of herbicide synergists on the absorption and translocation of glyphosate in Alternanthera philoxeroides

[0210] Test agent: glyphosate technical grade herbicide.

[0211] The herbicide synergist was formulated according to Example 3, with the volume ratio of synergist to water being 1:1500 and the glyphosate concentration being 5 g / L.

[0212] The weed tested was Alternanthera philoxeroides.

[0213] Application method: Select 10-12 pair-leaf stage Alternanthera philoxeroides plants for glyphosate foliar treatment. Count down to the fourth pair of leaves from the top of the plant. Use a microsyringe to evenly apply 10 μL of the herbicide solution to the leaf surface on both sides of the leaf vein. The comparative example uses glyphosate, while the example uses glyphosate mixed with herbicide synergist in a sample tank.

[0214] Experimental Methods: After 7 and 14 days of foliar treatment, the following parts were collected: Part I: the middle section from the node above the treated leaf to the node below the treated leaf (treated leaf stem and leaf); Part II: the middle section from the node above the treated leaf to the terminal bud (treated leaf stem and leaf above the treated leaf); Part III: the middle section from the two nodes below the treated leaf (treated leaf stem and leaf below the treated leaf); and Part IV: the rhizome. Four parts were sampled from each plant, and 20 plants were collected from each treatment. The glyphosate and its metabolites were detected using a triple quadrupole liquid chromatography-mass spectrometry (LC-MS) system (Shimadzu Corporation, model LC-MS-8060).

[0215] Table 16. Glyphosate content in *Alternanthera philoxeroides* at 7 and 14 days after treatment with glyphosate and glyphosate + herbicide synergist.

[0216]

[0217] "*" indicates that the absorption and translocation of the herbicide in this part is significantly higher when glyphosate is treated with adjuvants than when glyphosate is treated with adjuvants.

[0218] like Figure 19-22As shown, the results indicate that, compared with glyphosate alone, the combination of glyphosate and herbicide synergist resulted in more pronounced phytotoxicity symptoms on the leaves, upper stems and leaves, lower stems and leaves, and rhizomes of Alternanthera philoxeroides. This demonstrates that the herbicide synergist of this invention can promote the absorption and translocation of glyphosate within Alternanthera philoxeroides, thereby enhancing the control effect of systemic herbicides on perennial weeds.

[0219] Table 16 shows that, with the addition of herbicide synergist, the glyphosate content in the four parts of the plant was significantly higher than that in the control group 7 days after application, with the percentage increases reaching 3.35%, 367.69%, 68.39%, and 100.00%, respectively. The glyphosate content in the four parts of the plant was significantly higher than that in the control group 7 days after application, with the percentage increases reaching 1.63%, 534.47%, 43.06%, and 76.12%, respectively. The herbicide synergist significantly improved the absorption and translocation of glyphosate in Alternanthera philoxeroides.

[0220] Table 17. Content of aminomethylphosphonic acid in *Alternanthera philoxeroides* at 7 and 14 days after treatment with glyphosate and glyphosate + herbicide synergist.

[0221]

[0222] The asterisk (*) indicates that the absorption and translocation of glyphosate in this part is significantly higher when treated with glyphosate plus adjuvants than when treated with glyphosate alone.

[0223] Table 17 shows that, with the addition of herbicide synergist, the content of glyphosate metabolite aminomethylphosphonic acid in the four parts of the plant was significantly higher than that in the control group 7 days after application, with the percentage increase in the four parts reaching 12.76%, 152.00%, 54.55%, and 28.12%, respectively. The content of glyphosate in the four parts of the plant was also significantly higher than that in the control group 7 days after application, with the percentage increase in the four parts reaching 72.41%, 233.33%, 54.39%, and 60.60%, respectively. The herbicide synergist significantly increased the metabolism of glyphosate in Alternanthera philoxeroides.

[0224] Example 12

[0225] Field trial of the synergistic effect of herbicide adjuvants on the control of barnyardgrass in wheat fields by mesosulfuron-methyl

[0226] Test agent: The herbicide selected was 30 g / L mesosulfuron-methyl oil dispersible suspension (Anhui Tongling Fucheng Pesticide Co., Ltd.).

[0227] The herbicide synergist was formulated according to Example 3, with a volume ratio of synergist to water of 1:1500. The tested weed was *Hemiberlesia lataniae*.

[0228] Application method: When wheat "Yangfumai 11" is in the greening stage and the grass is in the 3-4 leaf stage, use a 3WBD-16L backpack electric sprayer to spray. The amount of water used is 450 liters per hectare. After mixing thoroughly, spray evenly and at a uniform speed in the field.

[0229] Experimental methods: The control example was treated with mesosulfuron-methyl, while the example was treated with mesosulfuron-methyl mixed with a herbicide synergist in the spray tank. The control efficacy per plant was assessed at 21, 30, and 45 days after application, and the fresh weight control efficacy was assessed at 45 days.

[0230] Control efficacy (%) = (Number of weeds in the control area - Number of weeds in the treatment area) × 100 / Number of weeds in the control area

[0231] Fresh weight control efficacy (%) = (fresh weight of weeds in the control area - fresh weight of weeds in the treatment area) × 100 / fresh weight of weeds in the control area.

[0232] Increased efficacy per plant (%) = (Effective efficacy of plant treated with adjuvant in tank mix - Effective efficacy of plant treated with single agent) × 100 / Effective efficacy of plant treated with single agent.

[0233] Fresh weight efficacy enhancement (%) = (fresh weight efficacy of mixed adjuvant treatment - fresh weight efficacy of single agent treatment) × 100 / fresh weight efficacy of single agent treatment.

[0234] Table 18. Control efficacy of mesosulfuron-methyl and tank-mixed adjuvants against purslane

[0235]

[0236] Table 19 Yield and yield characteristics of Yangfumai 11 under treatment with mesosulfuron-methyl and barrel-mixed adjuvants

[0237]

[0238] like Figure 23-25 As shown, the results indicate that when mesosulfuron-methyl is mixed with the herbicide synergist, it exhibits more pronounced yellowing, wilting, and death symptoms in *Bretschneidera sinensis* at 21, 30, and 45 days after application, demonstrating a superior control effect compared to mesosulfuron-methyl alone. This indicates that the herbicide synergist of this invention can improve the field control effect of mesosulfuron-methyl on *Bretschneidera sinensis* in wheat fields, and has the advantages of promoting efficacy and stabilizing control efficacy.

[0239] The results in Table 18 show that the addition of herbicide synergist significantly improved the control efficacy of mesosulfuron against *Begonia solani*. The plant control efficacy increased by 23.93%, 13.15%, and 11.11% at 21, 30, and 45 days after application, respectively, and the fresh weight control efficacy also increased by 7.70%. The herbicide synergist can significantly improve the control efficacy of mesosulfuron against *Begonia solani*.

[0240] Table 19 shows that compared with mesosulfuron-methyl alone, the addition of the adjuvant to Yangfumai 11 increased the number of grains per spike, the number of effective spikes, the thousand-grain weight, and the theoretical yield. Specifically, the number of grains per spike increased by 1.26, the number of effective spikes increased by 2.00 spikes / m², the thousand-grain weight increased by 0.01 g, and the theoretical yield increased by 217.86 kg / ha. In summary, while improving the control efficacy against purslane, the adjuvant did not negatively impact wheat yield traits, and the theoretical yield showed an increasing trend, indicating that the adjuvant has good safety and yield-increasing potential under the experimental conditions.

[0241] Example 13

[0242] Field trial of the synergistic effect of herbicide adjuvants on the control of barnyardgrass in paddy fields.

[0243] Test agent: 34% propargite EC (Shenyang Fengshou Pesticide Co., Ltd., Liaoning Province) was selected as the herbicide.

[0244] The herbicide synergist was formulated according to Example 3, with a volume ratio of synergist to water of 1:1500. The tested weed was barnyard grass.

[0245] Application method: When rice "Nanjing 46" is in the late tillering stage and barnyard grass is in the 3-4 leaf stage, use a 3WBD-16L backpack electric sprayer to spray. The amount of water used is 450 liters per hectare. After thorough mixing, spray evenly and at a uniform speed in the field.

[0246] Experimental methods: The control example was treated with propanil, while the experimental example used propanil mixed with herbicide synergist in the application tank. The control efficacy per plant was assessed at 7, 15, and 30 days after application, and the fresh weight control efficacy was assessed at 30 days.

[0247] Control efficacy (%) = (Number of weeds in the control area - Number of weeds in the treatment area) × 100 / Number of weeds in the control area

[0248] Fresh weight control efficacy (%) = (fresh weight of weeds in the control area - fresh weight of weeds in the treatment area) × 100 / fresh weight of weeds in the control area.

[0249] Increased efficacy per plant (%) = (Effective efficacy of plant treated with adjuvant in tank mix - Effective efficacy of plant treated with single agent) × 100 / Effective efficacy of plant treated with single agent.

[0250] Fresh weight efficacy enhancement (%) = (fresh weight efficacy of mixed adjuvant treatment - fresh weight efficacy of single agent treatment) × 100 / fresh weight efficacy of single agent treatment.

[0251] Table 20. Barnyardgrass control efficacy under treatment with propargite and barrel-mixed adjuvants.

[0252]

[0253] Table 21 Yield and yield characteristics of Nanjing 46 rice under treatment with dimethoate and barrel-mixed adjuvants

[0254]

[0255] Table 20 shows that the addition of the adjuvant significantly improved the control efficacy of propanil against barnyard grass at all survey periods. The plant control efficacy increased by 45.20%, 24.83%, and 5.98% at 7, 15, and 30 days after application, respectively, and the fresh weight control efficacy also increased by 6.79%. This indicates that the adjuvant can effectively enhance the control effect of propanil against barnyard grass and has a significant synergistic effect.

[0256] Table 21 shows that compared with the use of barnyardgrass control alone, the addition of the adjuvant to the rice variety Nanjing 46 increased the number of grains per panicle, the number of effective panicles, the thousand-grain weight, and the theoretical yield. Specifically, the number of grains per panicle increased by 2.23, the number of effective panicles increased by 2.00 panicles / m², the thousand-grain weight increased by 0.11 g, and the theoretical yield increased by 93.60 kg / ha. In summary, while improving barnyardgrass control efficacy, the adjuvant did not have a significant negative impact on rice yield traits, and the theoretical yield showed an increasing trend, indicating that the adjuvant has good safety and yield-increasing potential under the experimental conditions.

Claims

1. A herbicide synergist, characterized in that, The herbicide synergist comprises the following components by weight percentage: 3-5% taurine, 15-40% sodium dodecylphenol-formaldehyde dimer sulfonate, 45-55% ethoxylated triglycerides, and the remainder being deionized water.

2. The method for preparing the herbicide synergist according to claim 1, characterized in that, The process includes the following steps: Taurine, sodium dodecylphenol-formaldehyde dimer sulfonate, ethoxylated triglycerides, and deionized water are added to a stirred tank and stirred until homogeneous at a stirring speed of 60-120 r / min for 10-30 minutes; after stirring, the resulting system is a uniform, transparent or semi-transparent liquid phase without stratification, precipitation, or visible suspended matter.

3. The application of the herbicide synergist as described in claim 1 in the control of weeds in crop fields by herbicides.

4. The application according to claim 3, characterized in that, The herbicide synergist described in claim 1 is diluted at a ratio of 1:500 to 1500, then mixed evenly with the herbicide and sprayed.

5. The application according to claim 3, characterized in that, The herbicide is one or more of the following: sulfonylurea herbicide mesosulfuron-methyl, substituted urea herbicide isoproturon, aryloxyphenoxypropionate herbicide clodinafop-propionate, quizalofop-p-ethyl, benzoylcyclohexanedione herbicide mesosulfuron-methyl, amide herbicide propargite, triazolidinesulfonamide herbicide penflusulfonamide, imidazolinone herbicide methoxyfenozide, and organophosphorus herbicide glyphosate.

6. The application according to claim 3, characterized in that, The weeds are one or more of the following: barnyard grass, geranium, barnyard grass, weedy rice, crabgrass, amaranth, and alligator weed.

7. The application of the herbicide synergist of claim 1 in improving the wetting and spreading ability of herbicides.

8. The application of the herbicide synergist according to claim 1 in reducing the amount of herbicide used.

9. The application of the herbicide synergist of claim 1 in improving the herbicide's resistance to rain washout.

10. The application of the herbicide synergist of claim 1 in improving weed control efficacy.

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