Pesticide-reducing synergistic seed dressing agent and application thereof

Abstract

The invention belongs to the technical field of agricultural planting, and particularly relates to a pesticide-reducing synergistic seed-dressing agent and application thereof.The seed-dressing agent is prepared from, by weight, 10%-20% of lanthanum nitrate, 7%-14% of arginine, 3% of a film-forming agent, 0.2% of a thickening agent and the balance distilled water; wherein the lanthanum nitrate is lanthanum nitrate hexahydrate, and the molecular formula of the lanthanum nitrate is La (NO3) 3.6 H2O (CAS number: 10277-43-7); the arginine is L-arginine, and the molecular formula of the arginine is C6H14N4O2 (the number of CAS is 74-79-3). The application of the pesticide-reducing synergistic seed-dressing agent comprises the following steps: uniformly mixing the seed-dressing agent with a pesticide for treating seeds, and dressing seeds of crops such as rice, wheat and the like; the seed-dressing agent disclosed by the invention has the beneficial effects of promoting absorption of pesticide by crop plants and increasing the pesticide content of stem and leaf parts, so that the prevention effect on plant diseases and insect pests is improved, the use amount of the pesticide for seed treatment can be remarkably reduced, and the pesticide utilization efficiency is improved. No adverse effect is caused on seedling emergence of crop seeds, and seedling quality is improved. The fertilizer can promote crop growth and improve resistance to diseases and insect pests.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural planting, and particularly relates to a pesticide-reducing and efficiency-enhancing seed dressing agent and application thereof. Background Art

[0002] In modern agricultural production, the use of pesticides is essential for controlling pests and diseases and ensuring crop yields. However, excessive use of pesticides not only increases production costs, but may also pollute the environment and affect the quality and safety of agricultural products. Therefore, the development of new pesticide adjuvants with the characteristics of reducing pesticide use and increasing efficiency has become an urgent need for the sustainable development of agriculture.

[0003] Seed treatment is one of the important application methods to achieve precise reduction of pesticide dosage. Applying pesticides through seed treatment saves time and labor, reduces costs and increases efficiency, and can reduce environmental pollution problems caused by droplet drift. It has been vigorously developed in recent years. Under the seed treatment method, the conduction of pesticides from the seed surface to the pest-infested parts (stems and leaves) is the last step for pesticides to reach the target, and it is also one of the key factors determining the utilization rate of pesticides. From a macroscopic perspective, the pesticides on the seed surface are absorbed by the crop roots and then conducted over long distances through the xylem to other parts of the plant. The conduction speed is affected not only by the physical and chemical properties of the pesticide itself, but also by the physiological and biochemical characteristics of the plant. From a microscopic perspective, the pesticides absorbed by the roots must undergo at least two short-distance transmembrane transports before they can enter the xylem vessels and be conducted upward. In addition, seeds treated with pesticides will encounter various abiotic stresses after sowing, such as low temperature, drought, salinity and other adverse conditions. The combination of pesticides and adverse environments may cause pesticide damage such as no germination or slow germination, uneven germination, and weak growth. For example, the triazole fungicide tebuconazole can cause pesticide damage when used to mix wheat seeds at low temperatures. Therefore, it is crucial to achieve efficient use of pesticides and ensure safety under seed treatment by promoting crop growth, improving crop resistance, and improving the transmission efficiency of pesticides in plants.

[0004] In terms of improving the conduction efficiency of pesticides in plants, it has been reported that lanthanum can activate the endocytosis of plant cells and provide a channel for exogenous substances to enter plant cells. At the same time, amino acid transporters provide a fast channel for the absorption and conduction of some pesticides in plants. Therefore, the combined use of lanthanum and arginine may promote the absorption and conduction of pesticides in plants by regulating the expression of transporters and activating the endocytosis of plant cells. In terms of promoting plant growth and resisting adversity, lanthanum nitrate and arginine have their own unique advantages, and these advantages can complement each other to a certain extent and jointly improve the growth performance and stress resistance of plants. First, lanthanum nitrate and arginine have a synergistic effect on plant growth and development. Lanthanum nitrate mainly promotes plant growth by improving photosynthetic efficiency and promoting material metabolism, while arginine focuses more on the development of the root system and the improvement of stress resistance. The combination of the two can comprehensively promote plant growth and development; in addition, lanthanum nitrate and arginine can both improve the stress resistance of plants, but their mechanisms of action are different. Lanthanum nitrate mainly copes with adversity by regulating the activity of biochemical enzymes and material metabolism in plants, while arginine enhances the stress resistance of plants by increasing proline content and signal molecule synthesis. The combination of the two can provide plants with more comprehensive stress resistance protection.

[0005] In summary, by mixing lanthanum and arginine with pesticides for seed dressing, the absorption and conduction of pesticides in crop plants can be promoted on the basis of improving the growth of crop plants, which is of great significance and value for improving the utilization rate of pesticides. Summary of the invention

[0006] In view of this, the present invention provides a pesticide-reducing and synergistic seed dressing agent and application thereof to solve the above-mentioned problems described in the background technology.

[0007] In order to achieve the above object, the present invention is achieved through the following technical solutions: The invention provides a pesticide-reducing and synergistic seed dressing agent, comprising the following components in percentage by weight: 10% to 20% of lanthanum nitrate, 7% to 14% of arginine, 3% of a film-forming agent, 0.2% of a thickener, and the balance of distilled water; wherein the lanthanum nitrate is lanthanum nitrate hexahydrate, and the molecular formula is La(NO3)3·6H2O (CAS No.: 10277-43-7); the arginine is L-arginine, and the molecular formula is C6H 14 N4O2(CAS No.:74-79-3).

[0008] In the above-mentioned pesticide-reducing and synergistic seed dressing agent, as a preferred solution, the film-forming agent is one or a combination of two selected from polyvinyl alcohol, chitosan, sodium carboxymethyl cellulose, modified starch and polyacrylamide; In the above-mentioned pesticide-reducing and synergistic seed dressing, as a preferred solution, the film-forming agent is a mixture of polyvinyl alcohol and chitosan, and the mass ratio of polyvinyl alcohol to chitosan is 6:1 to 2:1.

[0009] In the above-mentioned pesticide-reducing and synergistic seed dressing agent, as a preferred solution, the thickener is a mixture of xanthan gum and sodium benzoate, and the mass ratio of xanthan gum to sodium benzoate is 2:1.

[0010] In the above-mentioned pesticide-reducing and synergistic seed dressing agent, as a preferred scheme, the preparation steps of the seed dressing agent include: step 1, mixing xanthan gum and sodium benzoate in a ratio of 2:1, and preparing a thickener mother solution containing 2% xanthan gum and 1% sodium benzoate with water; Step 2: Evenly mix 10%-20% lanthanum nitrate, 7%-14% arginine, 3% film-forming agent and the balance of distilled water, and grind the mixture at 1000 rpm for 2 h; Step 3: Add thickener mother liquor to the material after grinding in step 2, and stir evenly to obtain seed dressing agent.

[0011] The invention discloses an application of a seed dressing agent with reduced pesticide use and increased efficiency. The seed dressing agent is mixed evenly with a pesticide used for treating seeds, and then the seeds of crops such as rice and wheat are dressed with the seed dressing agent. The amount of the seed dressing agent is based on the amount of seeds used, and 5 to 10 mL of the seed dressing agent is added per kilogram of seeds. The amount of the pesticide used is based on the recommended dose on the pesticide use label.

[0012] In the application of the above-mentioned pesticide-reducing and synergistic seed dressing agent, as a preferred solution, the pesticide is at least one of thiophanate-methyl, chlorantraniliprole, trifluanid, prothioconazole, thiamethoxam or cyanostrobin.

[0013] The present invention provides a pesticide-reducing and synergistic seed dressing agent and its application, which has the following beneficial effects: (1) The pesticide-reducing and synergistic seed dressing agent of the present invention is mixed with seed treatment pesticides to promote the absorption of pesticides by crop plants and increase the pesticide content in the stems and leaves, thereby improving the prevention effect on pests and diseases, and can significantly reduce the amount of seed treatment pesticides used and improve the utilization efficiency of pesticides.

[0014] (2) The reduced-drug and increased-efficiency seed dressing agent of the present invention is mixed with seed treatment pesticides for use, has no adverse effect on crop seed germination, and improves the quality of seedlings.

[0015] (3) The reduced-drug and increased-efficiency seed dressing agent of the present invention can be used in combination with seed treatment pesticides to promote crop growth and improve resistance to diseases and insect pests. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The effect of the pesticide-reducing and synergistic seed dressing agent provided by the present invention on the emergence of rice and wheat seeds; Figure 2 The effect of the pesticide-reducing and synergistic seed dressing agent provided by the present invention on the quality of rice seedlings; Figure 3 The effect of the pesticide-reducing and synergistic seed dressing agent provided by the present invention on the quality of wheat seedlings; Figure 4 The effect of the pesticide-reducing and synergistic seed dressing agent provided by the present invention on the pesticide content in the stems and leaves of rice plants; Figure 5 The effect of the pesticide-reducing and synergistic seed dressing agent provided by the present invention on the pesticide content in the stems and leaves of wheat plants; Figure 6 The invention discloses the effect of the pesticide-reducing and synergistic seed dressing agent provided by the invention on the control effect of major rice diseases and insect pests. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Exemplary embodiments of the present invention will be described in detail with reference to the following drawings.

[0019] The exemplary embodiments of the present invention are described below in conjunction with specific circumstances: Embodiment 1: The present invention provides a pesticide-reducing and synergistic seed dressing agent, comprising the following components in percentage by weight: 10% to 20% lanthanum nitrate, 7% to 14% arginine, 3% film-forming agent, 0.2% thickener, and the balance of distilled water; wherein the lanthanum nitrate is lanthanum nitrate hexahydrate, with a molecular formula of La(NO3)3·6H2O (CAS No.: 10277-43-7); the arginine is L-arginine, with a molecular formula of C6H 14 N4O2(CAS No.:74-79-3).

[0020] The film-forming agent is one or a combination of two of polyvinyl alcohol, chitosan, sodium carboxymethyl cellulose, modified starch and polyacrylamide; the film-forming agent is a mixture of polyvinyl alcohol and chitosan, and the mass ratio of polyvinyl alcohol to chitosan is 4:1. The thickener is a mixture of xanthan gum and sodium benzoate, and the mass ratio of xanthan gum to sodium benzoate is 2:1.

[0021] The preparation steps of the seed dressing agent include: step 1, mixing xanthan gum and sodium benzoate in a ratio of 2:1, and preparing a thickener mother liquor containing 2% xanthan gum and 1% sodium benzoate with water; step 2, evenly mixing 10%-20% lanthanum nitrate, 7%-14% arginine, 3% film-forming agent and the remainder of distilled water, and grinding the mixture at 1000 rpm for 2 hours; step 3, adding the thickener mother liquor to the material after grinding in step 2, and stirring evenly to obtain the seed dressing agent.

[0022] Example 2: A pesticide-reducing and synergistic seed dressing adjuvant, the weight percentages of raw materials are as follows: 10% lanthanum nitrate, 7% arginine, 3% film-forming agent, 0.2% thickener, 0.1% preservative and the balance distilled water.

[0023] The preparation method of the pesticide-reducing and synergistic seed dressing agent comprises the following steps: Weigh each component according to the above formula, mix xanthan gum and sodium benzoate, and use water to prepare a thickener mother liquor containing 2% xanthan gum and 1% sodium benzoate; mix lanthanum nitrate, arginine, film-forming agent and the remaining water evenly, and grind the mixture at 1000 rpm for 2 h; after grinding, add the thickener mother liquor, stir evenly to obtain a seed dressing, which is used for the experiments in the subsequent examples.

[0024] Example 3: Application of a reduced-drug and increased-efficiency seed dressing agent, after the seed dressing agent is evenly mixed with the pesticide used for seed treatment, the seeds of crops such as rice and wheat are dressed; the amount of the seed dressing agent is based on the amount of seeds, and 5 to 10 mL of the seed dressing agent is added per kilogram of seeds; the amount of the pesticide is used according to the recommended dose on the pesticide label. The pesticide is at least one of thiofuran, chlorfenapyr, trifluanid, prothioconazole, thiamethoxam or cyanothiocarb.

[0025] Example 4: Combination Figure 1-Figure 3 , a pesticide-reducing and efficiency-enhancing seed dressing agent is mixed with seed treatment pesticides for seed dressing, which is highly safe for rice and wheat seed germination and is beneficial to improving the quality of seedlings.

[0026] 1. Test pesticides and test subjects Experimental agents: 24% thiophanate-methyl suspension, Dow AgroSciences, USA; 20% chlorfenapyr suspension, DuPont, USA; 10% trifluanid suspension, DuPont, USA; 23% thiamethoxam·propythiocarb·fludioxonil (20%+1%+2%) seed treatment suspension, product to be registered; 25% cyproconazole suspension, Jiangsu Pesticide Research Institute Co., Ltd.

[0027] Experimental objects: Rice variety: Nanjing 9108; wheat variety: Ningmai 13.

[0028] 2. Experimental treatment Rice seed dressing treatment (T): add 25 ml of 24% thiofuran suspension + 5 ml of 20% chlorfenapyr suspension + 3.75 ml of 10% trifluanid suspension + 10 ml of pesticide-reducing and synergistic seed dressing agent per kilogram of rice seeds, and mix the seeds; Rice seed dressing control (CK): add 25 ml of 24% thiophanate-methyl suspension + 5 ml of 20% chlorfenapyr suspension + 3.75 ml of 10% triflumuron suspension + 10 ml of water per kilogram of rice seeds and mix with the seeds; Rice seed dressing control (CK0): add 43.75 ml water per kilogram of rice seeds and mix the seeds; Wheat seed dressing treatment (T): add 7 ml of thiamethoxam·prothiocarb·fludioxonil (20%+1%+2%) seed treatment suspension + 2 ml of 25% cyproconazole suspension + 10 ml of pesticide-reducing and synergistic seed dressing agent per kilogram of wheat seeds, and mix the seeds; Wheat seed dressing control (CK): add 7 ml of thiamethoxam·prothiocarb·fludioxonil (20%+1%+2%) seed treatment suspension + 2 ml of 25% cyproconazole suspension + 10 ml of water per kilogram of wheat seeds and mix with the seeds; Wheat seed dressing control (CK0): Add 19 ml of water per kilogram of wheat seeds and mix the seeds.

[0029] 3. Test steps Seed dressing: Weigh 1 kg of seeds and pour into a small seed dressing device. Slowly add each treatment agent while stirring according to the dosage. If the reagent has no bright color, add 1 ml of rose red slurry as an indicator. Stir continuously for 2 minutes. After the seeds are evenly colored, spread them flat on kraft paper and dry them in the shade for later use.

[0030] Germination and seedling test: The soil culture method was used to determine the effect of each treatment on seed germination. Specifically, 100 full-grain rice or wheat seeds were selected for each treatment and sown in a plastic hole tray filled with soil, 2 seeds per hole, covered with a thin layer of soil, kept moist and placed in an artificial greenhouse for seedling cultivation, and watered in time. The germination of each treatment was investigated on the 15th day after sowing, and each treatment was repeated 3 times.

[0031] Determination of seedling quality indexes: Rice and wheat plant samples were collected on the 30th day after sowing, and about 40 seedlings were taken from 20 holes for each treatment. The soil attached to the roots and stems and leaves were washed clean with water. Ten seedlings were randomly selected for each treatment, and the plant height and stem base width were measured respectively; the relative chlorophyll content value (SPAD value) in the middle of the first true leaf of the seedling was measured using a chlorophyll meter; the seedlings were cut into roots and stems and leaves, placed in an oven at 105℃ for 10 min, and then dried at 80℃ to constant weight, and the dry weight of roots and stems and leaves was weighed.

[0032] 4. Results Analysis (1) Seed germination rate of different treatments The germination rates of rice and wheat seeds under different treatments were determined using the soil culture method. Figure 1 It can be seen that compared with the blank control of clear water (CK0) and the seed dressing with pesticide only (CK), the seed dressing treatment (T) of the reduced-drug and increased-synergy type seed dressing agent mixed with pesticides had no adverse effect on the emergence rate of both rice and wheat, indicating that the mixed seed dressing of the reduced-drug and increased-synergy type seed dressing agent of the present invention with the seed treatment pesticide is highly safe for the emergence of rice and wheat seeds.

[0033] (2) Quality of seedlings under different treatments The quality of seedlings is a key factor affecting the growth and final yield of crops. Good seedling quality lays the foundation for crops to resist adversities such as pests and diseases and achieve high and stable yields. Figure 2 It can be seen that there is no significant difference in the plant height, stem base width, root dry weight, stem and leaf dry weight, and leaf chlorophyll content of rice seedlings in the treatment groups of pesticide seed dressing only (CK) and clear water blank control (CK0). However, compared with CK and CK0, the plant height, stem base width, root dry weight, stem and leaf dry weight of rice seedlings in the treatment of mixed seed dressing with pesticide (T) were significantly improved, and the leaf chlorophyll content was also slightly increased, indicating that the pesticide-reducing and synergistic seed dressing is effective in improving the quality of rice seedlings.

[0034] Depend on Figure 3 It can be seen that there is no significant difference in the wheat plant height, stem base width, root dry weight, stem and leaf dry weight, and leaf chlorophyll content in the pesticide seed dressing (CK) and water blank control (CK0) treatment groups. Compared with CK and CK0, the wheat plant height and stem base width increased significantly in the treatment of reduced-drug and increased-efficiency seed dressing and mixed-drug seed dressing (T), and the root dry weight, stem and leaf dry weight, and leaf chlorophyll content increased slightly, indicating that the reduced-drug and increased-efficiency seed dressing is effective in improving the quality of wheat seedlings.

[0035] Example 5: Combination Figure 4-Figure 5 , a pesticide-reducing and efficiency-enhancing seed dressing agent is mixed with seed treatment pesticides to promote the migration of seed dressing pesticides to crop plants.

[0036] 1. Test pesticides and test subjects Experimental agents: 24% thiophanate-methyl suspension, Dow AgroSciences, USA; 20% chlorfenapyr suspension, DuPont, USA; 10% trifluanid suspension, DuPont, USA; 23% thiamethoxam·propythiocarb·fludioxonil (20%+1%+2%) seed treatment suspension, product to be registered; 25% cyproconazole suspension, Jiangsu Pesticide Research Institute Co., Ltd.

[0037] Experimental objects: Rice variety: Nanjing 9108; wheat variety: Ningmai 13.

[0038] 2. Experimental treatment Rice pesticide + reduced-drug and synergistic seed dressing agent (T): add 25 ml of 24% thiophanate-methyl suspension + 5 ml of 20% chlorfenapyr suspension + 3.75 ml of 10% trifluanid suspension + 10 ml of reduced-drug and synergistic seed dressing agent per kilogram of rice seeds and mix the seeds; Rice pesticide reduction 20% + pesticide reduction and synergistic seed dressing agent (T reduction): add 20 ml of 24% thiophanate-methyl suspension concentrate + 4 ml of 20% chlorfenapyr suspension concentrate + 3 ml of 10% trifluanid suspension concentrate + 10 ml of pesticide reduction and synergistic seed dressing agent + 6.75 ml of water per kilogram of rice seeds and mix the seeds; Rice pesticide seed dressing control (CK): add 25 ml of 24% thiophanate-methyl suspension + 5 ml of 20% chlorfenapyr suspension + 3.75 ml of 10% triflumuron suspension + 10 ml of water per kilogram of rice seeds and mix with the seeds; Rice seed dressing control with 20% pesticide reduction (CK reduction): add 20 ml of 24% thiofluanid suspension + 4 ml of 20% chlorfenapyr suspension + 3 ml of 10% trifluanid suspension + 16.75 ml of water per kilogram of rice seeds and mix with the seeds; Wheat pesticide + pesticide-reducing and synergistic seed dressing agent (T): add 7 ml of 23% thiamethoxam·prothiocarb·fludioxonil seed treatment suspension + 2 ml of 25% cyproconazole suspension + 10 ml of pesticide-reducing and synergistic seed dressing agent per kilogram of wheat seeds and mix the seeds; Wheat pesticide reduction 20% + pesticide reduction and synergistic seed dressing agent (T reduction): add 5.6 ml of 23% thiamethoxam·prothiocarb·fludioxonil seed treatment suspension + 1.6 ml of 25% cyproconazole suspension + 10 ml of pesticide reduction and synergistic seed dressing agent + 1.8 ml of water per kilogram of wheat seeds and mix the seeds; Wheat pesticide seed dressing control (CK): add 7 ml of 23% thiamethoxam·prothiocarb·fludioxonil seed treatment suspension + 2 ml of 25% cyproconazole suspension + 10 ml of water per kilogram of wheat seeds and mix with the seeds; Wheat seed dressing control with 20% pesticide reduction (CK reduction): add 5.6 ml of 23% thiamethoxam·prothiocarb·fludioxonil seed treatment suspension + 1.6 ml of 25% cyproconazole suspension + 11.8 ml of water per kilogram of wheat seeds and mix with seeds; 3. Test steps Seed dressing: the method is the same as in Example 2.

[0039] Plant culture and sample collection: Select rice or wheat seeds with full grains and sow them in 32-hole plastic plug trays filled with soil, with 2 seeds per hole, cover with a thin layer of soil, keep them moist and place them in an artificial greenhouse for seedling cultivation, replenish water in time, and repeat each treatment 3 times. Collect the aboveground parts of rice and wheat plants on the 30th day after sowing, wash and dry them, and analyze and measure them immediately.

[0040] Index determination: The determination of the contents of thiophanate-methyl, chlorfenapyr and trifluanid in rice plants refers to the reference "Yang Tingyu, Yang Bangbao, Yan Xiaolong, et al. Migration and distribution of three pesticides in soil-rice system after seed dressing [J]. Journal of Jiangsu Agricultural Sciences, 2023, 39(2): 405-412"; the determination of the contents of thiamethoxam, cyproconazole and prothioconazole in wheat plants refers to the reference "Ju Chao. Absorption, transport and mechanism of seven pesticides by wheat plants [D]. Zhejiang University, 2020", "Pan Fan. Study on the efficacy and residual behavior of 48% cyproconazole·tebuconazole suspension on wheat fusarium wilt under different application machinery [D]. Anhui Agricultural University, 2019" and "Zhang Chengzhi. Residue analysis and primary dietary risk assessment of prothioconazole and its metabolites in wheat plants [D]. Anhui Agricultural University, 2022". Since fludioxonil is a non-systemic pesticide, it was not tested in this study.

[0041] 4. Results Analysis Sheath blight, rice leaf roller and rice planthopper are three important diseases and pests in rice production, which seriously threaten rice yield and quality. Due to their good systemic conductivity and long lasting effect, thiophanate-methyl, chlorfenapyr and trifluanid are mixed with rice seeds and can be absorbed by the rice roots and transmitted to the stems and leaves of the plants, thus achieving continuous prevention and control of target diseases and pests. Figure 4 It can be seen that compared with the control (CK), the use of the reduced-drug and synergistic seed dressing agent treatment (T) significantly increased the content of three pesticides in the stems and leaves of rice plants. Due to the reduction in the amount of pesticides used, the content of three pesticides in the stems and leaves of rice in the 20% reduced-drug treatment group (CK-minus) was significantly lower than that in the conventional dosage control group (CK). However, the content of three pesticides in the stems and leaves of rice plants in the 20% reduced-drug and synergistic seed dressing agent treatment group (T-minus) was equivalent to that in the conventional dosage control group (CK). Therefore, the reduced-drug and synergistic seed dressing agent developed by the present invention helps to improve the absorption and conduction of pesticides by rice plants. When the pesticide reduction and synergistic seed dressing agent is used when the pesticide reduction is 20%, the pesticide content in the stems and leaves of rice plants can reach the level of the conventional dosage treatment group.

[0042] Wheat stem rot, aphids and other diseases and insect pests often occur. Using pesticides containing active ingredients such as cyanobacterium, thiamethoxam and prothioconazole to mix seeds can achieve good preventive effects. Figure 5It can be seen that compared with the control (CK) and the control with 20% reduction in pesticide use (CK minus), the use of the reduced-drug and synergistic seed dressing agent (T and T minus) significantly increased the content of cyanothiocarb, thiamethoxam and prothioconazole in the stems and leaves of wheat plants. Due to the reduction in the amount of pesticides used, the content of the three pesticides in the stems and leaves of wheat treated with 20% reduced pesticides (CK minus) was significantly lower than that of the CK group. The content of the three pesticides in the stems and leaves of wheat plants treated with a 20% reduction in pesticides and a reduced-drug and synergistic seed dressing agent (T minus) was significantly increased, and the content was equivalent to that of the CK group. Therefore, the reduced-drug and synergistic seed dressing agent developed by the present invention helps to improve the absorption and conduction of pesticides by wheat plants. When the pesticide reduction and synergistic seed dressing agent is used when the pesticide reduction is 20%, the pesticide content in the stems and leaves of wheat plants can reach the level of the conventional dosage treatment group.

[0043] Embodiment 6, combined Figure 6 , a pesticide-reducing and efficiency-enhancing seed dressing agent is mixed with seed treatment pesticides to improve the prevention effect of pests and diseases.

[0044] 1. Test pesticides and test subjects Experimental drugs: 24% thiophanate-methyl suspension, Dow AgroSciences, USA; 20% chlorfenapyr suspension, DuPont, USA; 10% triflumuron suspension, DuPont, USA.

[0045] Experimental object: Rice, variety Nanjing 9108.

[0046] 2. Experimental treatment Seed dressing control (CK0): Add 43.75 ml of water per kilogram of rice seeds and mix the seeds.

[0047] Pesticide seed dressing control (CK): add 25 ml of 24% thiophanate-methyl suspension + 5 ml of 20% chlorfenapyr suspension + 3.75 ml of 10% triflumuron suspension + 10 ml of water per kilogram of rice seeds and mix the seeds.

[0048] Pesticide + pesticide-reducing and synergistic seed dressing agent (T): Add 25 ml of 24% thiophanate-methyl suspension + 5 ml of 20% chlorfenapyr suspension + 3.75 ml of 10% triflumuron suspension + 10 ml of pesticide-reducing and synergistic seed dressing agent per kilogram of rice seeds and mix the seeds.

[0049] Treatment with 20% reduction in pesticide dosage + seed dressing with reduced-pesticide and enhanced-efficiency agent (T reduction): add 20 ml of 24% thiophanate-methyl suspension + 4 ml of 20% chlorfenapyr suspension + 3 ml of 10% triflumuron suspension + 10 ml of reduced-pesticide and enhanced-efficiency agent + 6.75 ml of water per kilogram of rice seeds and mix the seeds.

[0050] 3. Test steps Seed dressing: Weigh a certain amount of seeds and pour them into a small seed mixing equipment. Slowly add each agent according to the dosage of each treatment agent while stirring. If the agent does not have a bright color, add an appropriate amount of rose red slurry as an indicator. Stir continuously for 2 minutes and take out the seeds after the seeds are evenly colored.

[0051] Sowing: Mix the soil through a 2 mm sieve with the rice seedling medium in a ratio of 1:1 and put it into the seedling tray. Sow the seeds evenly on the seedling tray and cover with soil. Then cover with non-woven fabric and water to keep the soil moist. Water on time according to the water management requirements of the rice seedling stage.

[0052] Transplanting: When the seedlings are 25 days old, transplant them to the field.

[0053] Pest and disease survey: Conventionally, the first field control is carried out about 70 days after sowing. Therefore, the control effects of different treatments on sheath blight, rice planthoppers and rice leaf rollers were investigated before the first application of pesticides in the field. For the sheath blight survey, 2 rice holes were surveyed at each point, 10 points were surveyed for each treatment, and the number of tillers and the disease grade were recorded. For the rice planthopper survey, the disc shooting method was used to survey 2 rice holes at each point, 5 points were surveyed for each treatment, and the number of rice planthoppers in the field was recorded. For the rice leaf roller survey, 50 rice holes were surveyed for each treatment, and the number of leaves and white leaves in each rice hole was recorded. The calculation method for the control effect of each treatment on rice sheath blight, rice planthoppers and rice leaf folder refers to the guidelines for pesticide field efficacy tests GB / T 17980.20-2000, GB / T17980.4-2000 and GB / T 17980.2-2000.

[0054] 4. Results Analysis Depend on Figure 6 It can be seen that compared with the use of pesticide seed dressing alone (CK), the control effect of the treatment group of reduced-dose and synergistic seed dressing agent and pesticide mixed seed dressing (T) was slightly improved. Due to the insufficient content of the pesticide, the control effect of the target pests and diseases, rice leaf roller, rice planthopper and sheath blight, was significantly reduced in the treatment group of 20% reduced pesticide seed dressing (CK minus). When the pesticide was reduced by 20%, the control effect of the reduced-dose and synergistic seed dressing agent (T minus) on the target pests and diseases was significantly improved, which was equivalent to CK, indicating that the reduced-dose and synergistic seed dressing agent has the effect of improving the control effect on pests and diseases under the condition of reduced pesticide.

[0055] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0056] The above specific examples are used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A pesticide-reducing and synergistic seed dressing agent, characterized in that: The invention comprises the following components in percentage by weight: 10% to 20% lanthanum nitrate, 7% to 14% arginine, 3% film former, 0.2% thickener and the balance of distilled water; wherein the lanthanum nitrate is lanthanum nitrate hexahydrate, and the molecular formula is La(NO3)3·6H2O; Arginine is L-arginine, with the molecular formula C6H 14 N4O2.

2. The pesticide-reducing and synergistic seed dressing agent according to claim 1, characterized in that The film-forming agent is one or a combination of two of polyvinyl alcohol, chitosan, sodium carboxymethyl cellulose, modified starch and polyacrylamide.

3. The pesticide-reducing and synergistic seed dressing agent according to claim 2, characterized in that: The film-forming agent is a mixture of polyvinyl alcohol and chitosan, and the mass ratio of polyvinyl alcohol to chitosan is 6:1-2:

1.

4. The pesticide-reducing and synergistic seed dressing agent according to claim 1, characterized in that: The thickener is a mixture of xanthan gum and sodium benzoate, and the mass ratio of xanthan gum to sodium benzoate is 2:

1.

5. The pesticide-reducing and synergistic seed dressing agent according to claim 1, characterized in that: The preparation steps of the seed dressing agent include: Step 1, xanthan gum and sodium benzoate are mixed in a ratio of 2:1, and prepared with water into a thickener mother solution containing 2% xanthan gum and 1% sodium benzoate; Step 2: Evenly mix 10%-20% lanthanum nitrate, 7%-14% arginine, 3% film-forming agent and the balance of distilled water, and grind the mixture at 1000 rpm for 2 h; Step 3: Add thickener mother liquor to the material after grinding in step 2, and stir evenly to obtain seed dressing agent.

6. The use of the reduced-drug and increased-synergy seed dressing agent according to any one of claims 1 to 5, characterized in that: After the seed dressing agent is evenly mixed with the pesticide used for seed treatment, the seeds of crops such as rice and wheat are dressed with the seed dressing agent; the amount of the seed dressing agent is based on the amount of seeds, and 5 to 10 mL of the seed dressing agent is added per kilogram of seeds; the amount of the pesticide is used according to the recommended dose on the pesticide use label.

7. The use of the reduced-drug and increased-synergy seed dressing agent according to claim 6, characterized in that: The pesticide is at least one of thiophanate-methyl, chlorantraniliprole, trifluanid, prothioconazole, thiamethoxam or cyproconazole.

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