Corn pest control drip irrigation agent and effect regulation method

Abstract

The present application relates to the technical field of pesticide compounding and crop pest control, in particular to a corn pest drip irrigation control agent and effect regulation method. The agent is composed of 5%-12% effective components (chlorantraniliprole and amitraz, mass ratio 1:2-1:8), 8%-15% additives (containing food-grade polyglycerol fatty acid ester, sodium alginate and laurocapram), 73%-87% solvent (deionized water-ethanol volume ratio 3:1-5:1), pH 6.0-7.0, viscosity 2.5-4.0 mPa·s, and is suitable for drip irrigation system. The regulation method is: applying once in the jointing stage and the big bell mouth stage (supplementing in the male stage in high incidence years), drip irrigation rate 0.8-1.2 L / h·plant, and drip irrigation water hardness controlled at 50-150 mg / L (adjusted with citric acid if exceeding the standard). The agent can synergistically control corn lepidoptera and piercing-sucking pests, delay resistance, has strong drip irrigation adaptability, high utilization rate and environmental protection, can improve corn yield, and is suitable for large-scale planting.

Description

Technical Field

[0001] This invention relates to the field of pesticide compounding and crop pest control technology, specifically to drip irrigation control agents for corn pests and methods for regulating their effects. Background Technology

[0002] Corn, as one of my country's three major grain crops, is widely planted and has a high yield, playing a vital role in ensuring national food security. However, frequent pests during the corn growing season severely impact yield and quality. Common pests include lepidopteran pests such as the corn borer, armyworm, and bollworm, as well as piercing-sucking pests such as spider mites and thrips. The corn borer larvae bore into the stems, causing stalk breakage and poor ear development; armyworms are voracious eaters, quickly consuming leaves and leaving the stalks bare, resulting in significant yield reduction; spider mites suck sap from leaves, causing chlorosis and wilting, affecting photosynthesis. These pests often occur in combination, posing a significant challenge to pest control.

[0003] Currently, corn pest control still relies primarily on chemical control, with the widespread use of single pesticides presenting numerous drawbacks. Chlorantraniliprole, a novel phthalamide insecticide, is highly effective, low in toxicity, and has a long-lasting effect against lepidopteran pests. Its mechanism of action involves activating ryanodine receptors in the insect's muscle, leading to sustained muscle contraction and death. However, long-term use of chlorantraniliprole alone has resulted in varying degrees of resistance in pests such as corn borers and armyworms, leading to a gradual decline in its efficacy. Furthermore, this pesticide is ineffective against spider mites and other piercing-sucking pests, failing to achieve integrated pest management. Amitraz, an amitraz insecticide, is mainly used to control mites and ticks, and also inhibits the hatching of some lepidopteran eggs. Its mechanism of action involves interfering with the transmission function of the insect's nervous system. However, amitraz has limited efficacy against lepidopteran larvae, and its short-lasting effect when used alone necessitates frequent application, increasing control costs and environmental pressure.

[0004] To address the shortcomings of single-agent pesticides, pesticide compounding has become an important development direction. By combining pesticides with different mechanisms of action, complementary advantages can be achieved, the control spectrum can be broadened, and the development of resistance can be delayed. However, most existing compound pesticides are designed for spray application and have poor compatibility with drip irrigation planting methods. With the development of water-saving agriculture, drip irrigation technology is widely used in maize cultivation, offering advantages such as water conservation, fertilizer saving, and precise application. However, when pesticides are applied through drip irrigation, problems such as pesticide sedimentation, pipe blockage, uneven root absorption, and unstable efficacy easily occur. Existing compound pesticides mostly use traditional pesticide adjuvants, which lack dispersibility, stability, and root penetration ability. They tend to deposit on the drippers during drip irrigation, affecting the application effect. Furthermore, there is a lack of targeted efficacy control methods, making it impossible to dynamically adjust according to the maize growth stage, pest occurrence, and water quality conditions, resulting in low pesticide utilization and large fluctuations in efficacy.

[0005] Furthermore, existing research on the combination of chlorantraniliprole and amitraz is limited, and most studies focus on spray formulations, neglecting to optimize the compounding ratio and adjuvant system for drip irrigation scenarios, and lacking corresponding efficacy control schemes. Some compound formulations blindly increase the dosage of active ingredients in pursuit of control efficacy, which not only increases costs but also easily leads to pesticide residues and environmental pollution. Simultaneously, adjuvant selection is often limited to commonly used pesticide varieties, failing to fully utilize the advantages of adjuvants from other fields, such as the safety and dispersibility of food-grade adjuvants, thus limiting the environmental friendliness and compatibility of the formulation. Therefore, developing a chlorantraniliprole / amitraz compound formulation that is suitable for drip irrigation, has a broad control spectrum, stable efficacy, and is environmentally friendly and highly efficient, along with corresponding efficacy control methods, has become an urgent need in the field of corn pest control. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing corn pest control pesticides, such as narrow control spectrum, strong resistance, poor compatibility with drip irrigation, unstable efficacy, and lack of supporting control methods. This invention provides a corn pest control pesticide formulated with chlorantraniliprole and amitraz, along with a method for controlling its efficacy. By optimizing the formulation ratio and adjuvant system, this pesticide achieves integrated control of lepidopteran and sucker-like pests in corn, delaying the development of resistance. The supporting control method is adaptable to drip irrigation systems, improving pesticide utilization and efficacy stability while reducing pesticide dosage, minimizing environmental pollution, and ensuring corn yield and quality.

[0007] The technical solution adopted by this invention to solve its technical problem is: a drip irrigation pesticide for controlling corn pests, comprising active ingredients, adjuvants and solvents in the following mass percentages: active ingredients 5%~12%, adjuvants 8%~15%, and solvents 73%~87%; The active ingredients are chlorantraniliprole and amitraz, with a mass ratio of 1:2 to 1:8. The additives include dispersants, stabilizers, and penetration enhancers. The dispersant is food-grade polyglycerol fatty acid ester, accounting for 30% to 45% of the total mass of the additives. The stabilizer is sodium alginate, accounting for 25% to 40% of the total mass of the additives; The penetration enhancer is laurocapram, accounting for 15% to 45% of the total mass of the additives; The solvent is a mixture of deionized water and ethanol, with a volume ratio of 3:1 to 5:1. The pH of this agent is adjusted to 6.0~7.0, and the viscosity is 2.5~4.0 mPa·s, making it suitable for pipeline delivery and root absorption in corn drip irrigation systems.

[0008] Specifically, the mass ratio of chlorantraniliprole to amitraz is 1:4 to 1:6.

[0009] Specifically, the polyglycerol fatty acid ester is polyglycerol-6-stearate, and the viscosity of sodium alginate is 100~200 mPa·s.

[0010] Specifically, 0.5% to 1.0% (by mass) of antifreeze, wherein the antifreeze is propylene glycol, may also be added.

[0011] Specifically, the mass percentage of the active ingredient is 8% to 10%.

[0012] A method for regulating the effect of drip irrigation in controlling corn pests, which uses the aforementioned drip irrigation pesticide for controlling corn pests, includes the following steps: (1) Application timing control: Apply once during the corn jointing stage and once during the large trumpet stage. In years with high incidence of pests, apply once during the tasseling stage. (2) Drip irrigation rate control: When applying the pesticide, the drip irrigation rate should be controlled at 0.8~1.2L / h·plant. After the pesticide is dripped, continue drip irrigation with clean water for 30~40 minutes. (3) Water quality adaptation and control: The total hardness of drip irrigation water is controlled at 50~150mg / L (calculated as CaCO3). If the water quality exceeds the standard, citric acid is added in advance to adjust it.

[0013] Specifically, the application rates of the pesticide during the jointing stage and the large trumpet stage are 1.5~2.0L / mu and 2.0~2.5L / mu, respectively, and the supplementary application rate during the tasseling stage is 1.0~1.5L / mu.

[0014] Specifically, before administering the medication, dilute it with deionized water at a volume ratio of 1:10 to 1:15, stir well, and then inject it into the drip irrigation system.

[0015] Specifically, the dripper flow rate of the drip irrigation system is 2.0~3.0L / h, and the dripper spacing is 30~40cm.

[0016] Specifically, when applying pesticides, if the incidence of spider mites in the field exceeds 10%, the proportion of amitraz in the pesticide can be increased to a mass ratio of chlorantraniliprole to amitraz of 1:7 to 1:8.

[0017] The beneficial effects of this invention are: 1. Synergistic effect and broad spectrum of control: When chlorantraniliprole and amitraz are combined in a specific ratio, their mechanisms of action complement each other. This not only significantly improves the control efficacy against lepidopteran pests such as corn borers and armyworms, but also effectively controls piercing-sucking pests such as spider mites, achieving integrated pest management. Compared with single agents, the efficacy is improved and the effective period is extended to 25-30 days. At the same time, it delays the development of pesticide resistance in pests, solving the problems of narrow control spectrum and strong resistance of single agents.

[0018] 2. High adaptability and utilization rate of drip irrigation: Food-grade polyglycerol fatty acid esters and sodium alginate are selected as adjuvants, combined with an optimized solvent system, which gives the agent good dispersibility, stability and root penetration ability. It can pass smoothly through the drip irrigation pipeline without sedimentation or blockage. The matching control method ensures that the agent penetrates the root area accurately by controlling the drip irrigation rate and dilution ratio, improves the root absorption efficiency, and improves the agent utilization rate compared with the traditional spraying method, reducing agent waste.

[0019] 3. Environmentally friendly and safe, improving corn quality: The amount of active ingredients in the agent is reduced compared to single agents, and the adjuvants are selected from food-grade varieties, which are highly safe. The solvent is mainly deionized water, which has little pollution to the soil and water environment. The pH value and viscosity are suitable for the corn root growth environment, avoiding damage to the root system, while reducing pesticide residues and improving corn yield and quality. Experiments have verified that it can increase corn yield.

[0020] 4. Flexible regulation and adaptable to large-scale planting: The supporting regulation methods can be dynamically adjusted according to the corn growth period, the type and degree of pest occurrence, and water quality conditions. It is simple to operate, adaptable to large-scale drip irrigation planting mode, and does not require additional equipment investment, reducing the prevention and control costs for growers and facilitating large-scale promotion and application. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] The drip irrigation pesticide for controlling corn pests described in this invention is composed of active ingredients, adjuvants, and solvents in the following mass percentages: active ingredients 5%~12%, adjuvants 8%~15%, and solvents 73%~87%. The active ingredients are chlorantraniliprole and amitraz in a mass ratio of 1:2~1:8. This ratio range allows for synergistic effects between the two pesticides, ensuring efficient control of lepidopteran pests such as corn borers and armyworms, while also effectively controlling piercing-sucking pests such as spider mites, and delaying the development of resistance. A preferred mass ratio is 1:4~1:6, where the synergistic effect is optimal, achieving a balance between efficacy and duration of action.

[0023] The adjuvants include dispersants, stabilizers, and penetration enhancers. The dispersant is food-grade polyglycerol fatty acid ester, preferably polyglycerol-6-stearate, accounting for 30%–45% of the total adjuvant mass. It has good dispersibility, safety, and biocompatibility, preventing pesticide sedimentation in drip irrigation lines and improving the uniformity of pesticide dispersion in the soil. Compared to traditional pesticide dispersants, it is more environmentally friendly and less likely to cause soil compaction. The stabilizer is sodium alginate with a viscosity of 100–200 mPa·s, accounting for 25%–40% of the total adjuvant mass. It forms a protective film to encapsulate the active ingredient, delaying pesticide decomposition, extending the duration of effect, and improving the stability of the pesticide in water, preventing efficacy loss due to water quality fluctuations. The penetration enhancer is laurocapram, accounting for 15%–45% of the total adjuvant mass. It promotes the absorption of the pesticide through the epidermal cells of corn roots, improving the translocation efficiency of the pesticide within the plant and enhancing the control efficacy. In addition, 0.5% to 1.0% (by weight) of propylene glycol can be added as an antifreeze in low-temperature environments to prevent the agent from freezing and affecting its application.

[0024] The solvent is a mixture of deionized water and ethanol, with a volume ratio of 3:1 to 5:1. Ethanol enhances the solubility of the active ingredient and prevents crystallization, while deionized water reduces the impact of impurities in the water on the stability of the pesticide. This mixed solvent system balances solubility and environmental friendliness, making it suitable for the delivery needs of drip irrigation systems. The final pH value of the pesticide is adjusted to 6.0–7.0, matching the pH of the corn root growth environment to avoid root damage while ensuring pesticide activity. The viscosity is controlled at 2.5–4.0 mPa·s, ensuring smooth passage of the pesticide through the drip irrigation lines and emitters while preventing excessively rapid diffusion that could lead to insufficient root absorption.

[0025] The method for regulating the effect of drip irrigation in controlling corn pests based on the above-mentioned agents, as described in this invention, includes regulation of application timing, regulation of drip irrigation rate, and regulation of water quality adaptation. The specific steps are as follows: (1) Timing of application: Based on the growth period of corn and the occurrence pattern of pests, apply once each at the jointing stage and the large trumpet stage. At the jointing stage, the corn stalk begins to grow rapidly. Applying at this time can form a pesticide barrier in the plant in advance to prevent corn borer from laying eggs and causing damage. The large trumpet stage is the peak period for pests such as corn borer and armyworm. Applying at this time can target the larvae and reduce the degree of damage. In years with high pest incidence, a supplementary application can be made at the tasseling stage to further consolidate the control effect. The application rates at each stage are 1.5~2.0L / mu at the jointing stage, 2.0~2.5L / mu at the large trumpet stage, and 1.0~1.5L / mu at the tasseling stage.

[0026] (2) Drip irrigation rate control: Before drip irrigation, dilute the pesticide with deionized water at a volume ratio of 1:10 to 1:15, stir evenly, and then inject into the drip irrigation system to avoid direct injection of high-concentration pesticide, which may cause pipe blockage or root burn. The drip irrigation rate should be controlled at 0.8 to 1.2 L / h per plant. This rate can ensure that the pesticide slowly penetrates into the corn root distribution area (10 to 20 cm deep) and improve the root absorption efficiency. After the pesticide is dripped, continue drip irrigation with clean water for 30 to 40 minutes to flush the residual pesticide in the pipe into the soil and promote the uniform diffusion of the pesticide in the soil, avoiding excessively high local pesticide concentration. The dripper flow rate of the drip irrigation system should be controlled at 2.0 to 3.0 L / h, and the dripper spacing should be 30 to 40 cm to match the corn planting density and ensure that each corn plant receives a uniform amount of pesticide.

[0027] (3) Water quality adaptation and control: The total hardness of drip irrigation water should be controlled at 50~150mg / L (calculated as CaCO3). If the water is too hard (total hardness exceeds 150mg / L), calcium and magnesium ions are easy to combine with the pesticide components to form precipitation, which will affect the efficacy of the pesticide and the smoothness of the pipeline. At this time, citric acid should be added in advance to adjust the water quality and reduce the total hardness to the qualified range. At the same time, avoid using water sources containing heavy metal ions to prevent heavy metals from reacting with the pesticide and reducing the control effect. In addition, when supplementing the pesticide, the pesticide ratio can be dynamically adjusted according to the types of pests. If the incidence of spider mites in the field exceeds 10%, the mass ratio of chlorantraniliprole to amitraz can be increased to 1:7~1:8 to enhance the control effect on spider mites.

[0028] All raw materials used in the examples are commercially available conventional products. The purity of chlorantraniliprole technical is ≥98%, the purity of amitraz technical is ≥95%, and the polyglycerol-6-stearate (food grade), sodium alginate (viscosity 150 mPa·s), lauryl acetone, ethanol, propylene glycol, and citric acid are all qualified industrial-grade products.

[0029] The method for calculating the preventive effect in the embodiment is as follows: Control efficacy (%) = (Insect population density in control area - Insect population density in treatment area) / Insect population density in control area × 100%; Production increase (%) = (Production in treatment area - Production in control area) / Production in control area × 100%.

[0030] Example 1: This example provides a drip irrigation pesticide for controlling corn pests, which is a combination of chlorantraniliprole and amitraz. The composition by mass percentage is as follows: 8% active ingredient (1.33% chlorantraniliprole, 6.67% amitraz, mass ratio 1:5), 12% adjuvants (4.8% polyglycerol-6-stearate, 4.2% sodium alginate, 3.0% lauryl acetone), and 80% solvent (60% deionized water, 20% ethanol, volume ratio 3:1).

[0031] Pharmaceutical preparation steps: (1) Weigh out deionized water and ethanol according to the proportion, pour them into a stirring vessel, stir at 300 r / min for 5 minutes at room temperature, mix evenly, and obtain a mixed solvent; (2) Add polyglycerol-6-stearate, sodium alginate and lauryl ketone to the mixed solvent in proportion, heat to 40°C, stir at 500 r / min for 20 minutes to completely dissolve the additives and form an additive solution; (3) Mix chlorantraniliprole and amitraz technical grade evenly in proportion, slowly add to the adjuvant solution, and continue stirring at 40℃ and 500r / min for 30 minutes to fully disperse and dissolve the technical grade; (4) After stirring, let it cool naturally to room temperature, adjust the pH value to 6.5 with citric acid, measure the viscosity to 3.2 mPa·s, filter to remove impurities (filtration precision 100 mesh), and obtain the finished drug, which is then sealed and stored for later use.

[0032] This pesticide was used in a corn pest control experiment at a large-scale corn planting base. The variety planted was Zhengdan 958, covering an area of ​​10 mu (approximately 1.65 acres). Drip irrigation was used with a dripper flow rate of 2.5 L / h and a dripper spacing of 35 cm. The experiment included a treatment group and a control group. The treatment group used the pesticide and control method of this invention, as detailed below: (1) Application timing: Apply once each at the jointing stage (when the corn plant is about 30cm tall) and the large trumpet stage (when the corn has 10-12 leaves). No supplementary application is required. (2) Dilution of the agent: Dilute the finished agent with deionized water at a volume ratio of 1:12, stir evenly and then inject into the drip irrigation system; (3) Drip irrigation rate: The drip irrigation rate is controlled at 1.0 L / h·plant, the application rate is 1.8 L / mu at the jointing stage and 2.2 L / mu at the large trumpet stage; (4) Water quality control: The total hardness of the drip irrigation water is 80 mg / L (calculated as CaCO3), which meets the requirements and no adjustment is needed. After the agent is dripped, continue drip irrigation of clean water for 35 minutes.

[0033] The experiment lasted from the jointing stage to the maturity stage of maize. During this period, the occurrence of pests was investigated regularly. The population density of corn borers, armyworms, and spider mites was investigated 10 days after application at the jointing stage, and 10, 20, and 30 days after application at the large trumpet stage. The control efficacy was calculated. At the maturity stage, the maize yield was measured and the yield increase was calculated.

[0034] Five control examples were set up simultaneously: Control Example 1: Single-agent chlorantraniliprole drip irrigation agent (8% active ingredient, adjuvants and solvents are the same as in this example, and the control method is the same as the treatment group); Control Example 2: Single-agent amitraz drip irrigation agent (8% active ingredient, adjuvants and solvents are the same as in this example, and the control method is the same as the treatment group); Control Example 3: Existing chlorantraniliprole plus amitraz compound spray agent (mass ratio 1:5, active ingredient 8%, traditional pesticide adjuvants, applied by spraying, application rate is the same as the treatment group); Control Example 4: The agent of this example plus conventional drip irrigation method (no control of drip irrigation rate, direct injection of agent, no subsequent drip irrigation with clean water); Control Example 5: Blank control (no agent applied, only drip irrigation with clean water).

[0035] Experimental results: Ten days after application at the jointing stage, the control efficacy against corn borers and armyworms in the treatment group was 92% and 90%, respectively, and the control efficacy against spider mites was 88%. Ten days after application at the large trumpet stage, the control efficacy against all three pests remained above 93%, and after 20 days, the control efficacy still reached 88%~90%, and after 30 days, the control efficacy was 85%~87%. The corn yield at maturity was 680 kg / mu, an increase of 15.3% compared with the blank control (590 kg / mu). Control Example 1: Good control efficacy against corn borer and armyworm (85%~88%), but only 35% control efficacy against spider mites, with efficacy dropping below 60% after 30 days, resulting in an 8.5% yield increase; Control Example 2: Good control efficacy against spider mites (82%), but only 65%~70% control efficacy against corn borer and armyworm, resulting in a 7.1% yield increase; Control Example 3: 80%~85% control efficacy against the three pests, but low pesticide utilization rate due to spraying, with efficacy dropping below 75% after 30 days, and high labor costs, resulting in a 9.2% yield increase; Control Example 4: Due to the lack of precise control, pesticides showed localized precipitation, uneven insect population density, and large fluctuations in control efficacy (75%~85%), resulting in a 10.1% yield increase; The blank control group suffered severe pest damage, with corn borer stalk boring rate reaching 30% and spider mite infestation rate reaching 45%, resulting in the lowest yield.

[0036] This embodiment demonstrates that the agent and control method of the present invention can achieve efficient and stable control of various corn pests, with a long-lasting effect and can significantly increase corn yield. Compared with single agent, traditional spraying and drip irrigation without control, it has obvious advantages.

[0037] Example 2: This example provides a drip irrigation pesticide for controlling corn pests, which is a combination of chlorantraniliprole and amitraz. The composition by mass percentage is as follows: 10% active ingredient (chlorantraniliprole 1.67%, amitraz 8.33%, mass ratio 1:5), 10% adjuvants (polyglycerol-6-stearate 3.5%, sodium alginate 3.5%, lauryl acetone 3.0%), 79% solvent (deionized water 62.4%, ethanol 16.6%, volume ratio 3.75:1), and 1% antifreeze (propylene glycol).

[0038] Pharmaceutical preparation steps: (1) Weigh out deionized water and ethanol according to the proportion, pour them into a stirring vessel, stir at 300 r / min for 5 minutes at room temperature, mix evenly, and obtain a mixed solvent; (2) Add polyglycerol-6-stearate, sodium alginate, lauryl ketone and propylene glycol to the mixed solvent in proportion, heat to 45°C, stir at 500 r / min for 25 minutes to completely dissolve the additives and antifreeze to form a mixed solution; (3) Mix chlorantraniliprole and amitraz technical grade evenly in proportion, slowly add to the mixed solution, keep at 45℃ and 500r / min and stir for 35 minutes to fully disperse and dissolve the technical grade. Take a sample every 10 minutes during the process to ensure that there is no particle precipitation. (4) After stirring, let it cool naturally to room temperature, adjust the pH value to 6.8 with citric acid, measure the viscosity to 3.5 mPa·s, filter with 100 mesh to remove impurities, and obtain the finished drug. Store it in a sealed container for later use (it can be stored at -5℃ without freezing).

[0039] This pesticide was used in a corn pest control trial at the same corn planting base. The planting variety, area, and drip irrigation system parameters were the same as in Example 1. The trial period covered the corn from the jointing stage to maturity, during which low temperatures (nighttime minimum temperature -3°C) and a high incidence of spider mites were observed. The treatment group used the pesticide and control method of this invention, as detailed below: (1) Application timing: Apply once during the jointing stage and the large trumpet stage, and apply once during the male emergence stage (because the incidence of spider mites reaches 12%). (2) Dilution of the agent: The finished agent is diluted with deionized water at a volume ratio of 1:13, stirred evenly, and then injected into the drip irrigation system; (3) Drip irrigation rate: 1.7L / mu at the jointing stage, 2.3L / mu at the large trumpet stage, and 1.2L / mu at the tasseling stage. The drip irrigation rate is controlled at 1.1L / h·plant. After the pesticide is dripped, continue drip irrigation with clean water for 38 minutes. (4) Water quality control: The total hardness of the drip irrigation water was 160 mg / L (calculated as CaCO3), which exceeded the standard. An appropriate amount of citric acid was added to adjust it to 120 mg / L, which met the requirements. (5) Ratio adjustment: When applying supplementary pesticides during the male ejaculation period, adjust the mass ratio of chlorantraniliprole to amitraz to 1:7.5 to enhance the control effect on spider mites.

[0040] Four control examples were set up in the experiment: Control Example 6: the pesticide of this embodiment (without antifreeze) plus the control method of this invention (low-temperature storage); Control Example 7: the pesticide of this embodiment plus no water quality adjustment method; Control Example 8: the pesticide of this embodiment plus supplementary application without adjusting the ratio; Control Example 9: blank control. The pest control efficacy and maize growth were investigated regularly, and the yield was measured at maturity.

[0041] Experimental results: Due to the addition of antifreeze, the treatment group showed good stability with no freezing or stratification of the pesticide under low-temperature conditions. Ten days after application at the jointing stage, the control efficacy against corn borers, armyworms, and spider mites was 93%, 91%, and 90%, respectively. Twenty days after application at the tasseling stage, the control efficacy remained at 89%–92%. Fifteen days after supplemental application at the tasseling stage, the control efficacy against spider mites increased to 94%, while the control efficacy against other pests remained above 90%. The corn yield at maturity was 675 kg / mu, an increase of 15.4% compared to the blank control (585 kg / mu), and the corn plants grew vigorously without root burn or leaf chlorosis. Control Example 6: The pesticide contained no antifreeze, and freezing occurred after low-temperature storage. After thawing, precipitation occurred, and the control efficacy was reduced by 8%~10% compared to the treatment group, while the yield increased by 10.2%. Control Example 7: Without water quality adjustment, slight precipitation occurred in the drip irrigation pipeline, and the drippers were clogged. The insect population density was uneven, and the control efficacy fluctuated between 78% and 86%, while the yield increased by 9.8%. Control Example 8: The ratio was not adjusted during supplementary application, and the control efficacy against spider mites was only 82%. 15 days after supplementary application, the control efficacy dropped to 77%, while the yield increased by 12.3%. The blank control group had severe insect infestation, low corn yield, and some plants showed premature aging due to insect stress.

[0042] This embodiment demonstrates that the agent of the present invention, after the addition of antifreeze, can be adapted to low-temperature environments. The supporting control method, through water quality adjustment and dynamic ratio adjustment, can cope with complex pest situations and environmental conditions, ensuring stable control efficacy, and further verifying the practicality and flexibility of the agent and control method.

[0043] Example 3: This example provides a drip irrigation pesticide for controlling corn pests, which is a combination of chlorantraniliprole and amitraz. The composition by mass percentage is as follows: 6% active ingredient (chlorantraniliprole 1.0%, amitraz 5.0%, mass ratio 1:5), 15% adjuvants (polyglycerol-6-stearate 6.0%, sodium alginate 4.5%, lauryl acetone 4.5%), and 79% solvent (deionized water 65.8%, ethanol 13.2%, volume ratio 5:1).

[0044] Pharmaceutical preparation steps: (1) Weigh out deionized water and ethanol according to the proportion, pour them into a stirring vessel, stir at 300 r / min for 5 minutes at room temperature, mix evenly, and obtain a mixed solvent; (2) Add polyglycerol-6-stearate, sodium alginate and lauryl ketone to the mixed solvent in proportion, heat to 38°C, stir at 450 r / min for 22 minutes to completely dissolve the additives and form an additive solution; (3) Mix chlorantraniliprole and amitraz technical grade evenly in proportion, and slowly add them to the adjuvant solution in three portions (10 minutes apart each time). After each addition, keep the mixture at 38°C and 450 r / min and stir for 10 minutes to ensure that the technical grade is fully dispersed and avoid excessive local concentration leading to crystallization. (4) After adding all the original drug, continue stirring for 30 minutes, let it cool naturally to room temperature, adjust the pH value to 6.2 with citric acid, measure the viscosity to be 2.8 mPa·s, filter through 100 mesh to remove impurities, and obtain the finished drug. Seal and store for later use.

[0045] This pesticide was used in a corn pest control trial at the same corn planting base. The variety planted was Xianyu 335, covering an area of ​​10 mu (approximately 1.65 acres). The drip irrigation system parameters were: dripper flow rate 2.2 L / h, dripper spacing 30 cm. The treatment group used the pesticide and control method of this invention, as detailed below: (1) Application timing: Apply once each during the jointing stage (when the plant is about 28cm tall) and the large trumpet stage (when the plant has 11 leaves). (2) Dilution of the agent: The finished agent is diluted with deionized water at a volume ratio of 1:11, stirred evenly, and then injected into the drip irrigation system; (3) Drip irrigation rate: 1.6 L / mu at the jointing stage and 2.1 L / mu at the large trumpet stage. The drip irrigation rate is controlled at 0.9 L / h·plant. After the pesticide is dripped, continue drip irrigation with clean water for 32 minutes. (4) Water quality control: The total hardness of the drip irrigation water is 70 mg / L, which meets the requirements and no adjustment is needed.

[0046] Five control examples were set up in the experiment: Control Example 10: The pesticide of this embodiment (adjuvants were traditional pesticide adjuvants: sodium dodecylbenzenesulfonate, polyvinyl alcohol, and penetrant T) plus the control method of this invention; Control Example 11: The pesticide of this embodiment plus drip irrigation rate of 1.5 L / h·plant (too fast); Control Example 12: The pesticide of this embodiment plus drip irrigation rate of 0.6 L / h·plant (too slow); Control Example 13: The pesticide of this embodiment plus application only once at the large trumpet stage; Control Example 14: Blank control. The pest control efficacy, the uniformity of pesticide distribution in the soil, and the maize yield were investigated regularly.

[0047] Experimental results: Ten days after application at the jointing stage, the control efficacy against corn borers, armyworms, and spider mites in the treatment group was 91%, 89%, and 87%, respectively; 30 days after application at the large trumpet stage, the control efficacy still reached 85%~88%; the pesticide was evenly distributed in the soil (coefficient of variation of pesticide concentration in the root area was 12%); the corn yield at maturity was 660 kg / mu, an increase of 15.8% compared with the blank control (570 kg / mu). Control Example 10: Traditional adjuvants have poor dispersibility, resulting in a 25% coefficient of variation in pesticide concentration in the soil. The control efficacy is 7%–9% lower than the treatment group, and the soil shows slight compaction. Yield increased by 10.5%. Control Example 11: Drip irrigation rate is too fast, pesticide diffusion is too shallow, and root absorption is insufficient. Control efficacy is reduced by 10%–12%, and yield increased by 8.7%. Control Example 12: Drip irrigation rate is too slow, pesticide is concentrated in the deep root layer, and the local concentration is too high, resulting in a small number of root burns. Control efficacy fluctuates greatly, and yield increased by 9.3%. Control Example 13: Only one application is used, the effective period is insufficient, and pests rebound later. Control efficacy drops to below 70%, and yield increased by 7.9%. The blank control corn yield was low, and pest damage was severe.

[0048] This embodiment demonstrates that the food-grade adjuvants selected in this invention can improve the uniformity of pesticide distribution in the soil, and the optimized drip irrigation rate and application timing can ensure the efficacy and the safety of corn growth. Even with a low dosage of active ingredient, it can still achieve a highly effective control effect, further verifying the synergistic advantages of pesticide formulation and control method.

[0049] The specific implementation methods of this invention are as shown in the above embodiments. During the preparation of the agent, temperature, stirring rate, and pH value must be strictly controlled to ensure that the adjuvant and active ingredient are fully integrated without any sediment or impurities. During application, the application parameters must be dynamically adjusted according to the corn growth stage, pest occurrence, and water quality conditions to avoid indiscriminate application. The agent of this invention can be stored sealed at room temperature (-5℃~35℃) with a shelf life of 12 months. During storage, direct sunlight and high-temperature, humid environments should be avoided. For different corn varieties and pest types in different regions, the proportion of active ingredients and the dosage can be finely adjusted within the scope of the claims of this invention to achieve good control effects.

Claims

1. A drip irrigation pesticide for controlling corn pests, characterized in that, Composed of active ingredients, auxiliaries, and solvents by mass percentage: active ingredients 5%~12%, auxiliaries 8%~15%, solvents 73%~87%; The active ingredients are chlorantraniliprole and amitraz, with a mass ratio of 1:2 to 1:

8. The additives include dispersants, stabilizers, and penetration enhancers. The dispersant is food-grade polyglycerol fatty acid ester, accounting for 30% to 45% of the total mass of the additives. The stabilizer is sodium alginate, accounting for 25% to 40% of the total mass of the additives; The penetration enhancer is laurocapram, accounting for 15% to 45% of the total mass of the additives; The solvent is a mixture of deionized water and ethanol, with a volume ratio of 3:1 to 5:

1. The pH of this agent is adjusted to 6.0~7.0, and the viscosity is 2.5~4.0 mPa·s, making it suitable for pipeline delivery and root absorption in corn drip irrigation systems.

2. The corn pest drip irrigation control agent according to claim 1, characterized in that: The mass ratio of chlorantraniliprole to amitraz is 1:4 to 1:

6.

3. The corn pest drip irrigation control agent according to claim 1, characterized in that: The polyglycerol fatty acid ester is polyglycerol-6-stearate, and the viscosity of sodium alginate is 100~200 mPa·s.

4. A method for regulating the effect of drip irrigation in controlling corn pests, wherein the method is implemented using the corn pest drip irrigation control agent described in any one of claims 1-3, characterized in that, Includes the following steps: (1) Application timing control: Apply once during the corn jointing stage and once during the large trumpet stage. In years with high incidence of pests, apply once during the tasseling stage. (2) Drip irrigation rate control: When applying the pesticide, the drip irrigation rate should be controlled at 0.8~1.2L / h·plant. After the pesticide is dripped, continue drip irrigation with clean water for 30~40 minutes. (3) Water quality adaptation and control: The total hardness of drip irrigation water should be controlled at 50~150mg / L. If the water quality exceeds the standard, citric acid should be added in advance to adjust it.

5. The method for regulating the control effect of drip irrigation for corn pests according to claim 4, characterized in that: The application rates of the pesticide during the jointing stage and the large trumpet stage are 1.5~2.0L / mu and 2.0~2.5L / mu, respectively, and the supplementary application rate during the tasseling stage is 1.0~1.5L / mu.

6. The method for regulating the control effect of drip irrigation for corn pests according to claim 4, characterized in that: Before administering the medication, dilute it with deionized water at a volume ratio of 1:10 to 1:15, stir well, and then inject it into the drip irrigation system.

7. The corn pest drip irrigation control agent according to claim 1, characterized in that: An antifreeze agent, namely propylene glycol, may also be added at a mass percentage of 0.5% to 1.0%.

8. The method for regulating the control effect of drip irrigation for corn pests according to claim 4, characterized in that: The dripper flow rate of the drip irrigation system is 2.0~3.0L / h, and the dripper spacing is 30~40cm.

9. The corn pest drip irrigation control agent according to claim 1, characterized in that: The active ingredient has a mass percentage of 8% to 10%.

10. The method for regulating the control effect of drip irrigation for corn pests according to claim 4, characterized in that: When applying pesticides, if the incidence of spider mites in the field exceeds 10%, the proportion of amitraz in the pesticide can be increased to a mass ratio of chlorantraniliprole to amitraz of 1:7 to 1:8.