A method for improving the effect of neonicotinoid seed coating agents in controlling cotton aphids

Abstract

The present invention discloses a method for improving the effectiveness of neonicotinoid seed coating agents in controlling cotton aphids, belonging to the technical field of seed coating. The present invention discloses a method for improving the effectiveness of neonicotinoid seed coating agents in controlling cotton aphids. By adding a certain amount of synergistic substances, such as brown algae powder or cellulase, to the neonicotinoid seed coating agent and applying the agent to cotton seeds, the method can improve the effectiveness of the seed coating agent in controlling cotton aphids, significantly reducing the number and damage of aphids in the cotton seedling stage. The method has extremely high application value for promoting seed coating technology for controlling seedling aphids.

Description

Technical Field

[0001] The present invention relates to the technical field of seed coating, and more particularly to a method for improving the effect of a neonicotinoid seed coating agent in preventing and controlling cotton aphids. Background Art

[0002] Neonicotinoid insecticides have good systemic absorption and upward conductivity, and are the main agents for controlling agricultural pests. Application methods include foliar spraying, seed coating, etc. Based on their strong systemic properties, neonicotinoid seed coating agents can be applied to the soil, and then absorbed and metabolized by plants into compounds with insecticidal activity to act on target pests. Compared with spraying, seed coating uses a low amount of medicine, has less lethality to natural enemies, and is safe and easy to operate.

[0003] Currently, thiamethoxam and imidacloprid, the primary neonicotinoid seed coating agents, are widely used in crops such as cotton, wheat, and corn. However, existing seed coating technologies suffer from low efficacy and a short duration of effectiveness. For example, in the control of cotton seedling aphids, infestations begin in early May in Hebei's cotton-growing areas, peak from late May to early June, and infestations persist throughout the entire seedling stage. Existing seed coating products have some effectiveness against aphids, but this effectiveness decreases significantly around 30 days after sowing. While seed coating can control aphid infestations below the economic threshold, aphid populations and leaf curl rates are 1-2 times higher than with spraying. Farmers still frequently resort to blind control, and the use of chemical agents in production remains high, hindering the green development of the cotton industry. Therefore, improving the effectiveness of seed coating for aphid control is key to fully leveraging the advantages of coating technology.

[0004] Therefore, providing a method for improving the effect of neonicotinoid seed dressing agents in controlling cotton aphids is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a method for improving the effect of neonicotinoid seed coating agents in controlling cotton aphids. By adding a certain concentration of synergistic substances - brown algae powder or cellulase to the basic neonicotinoid seed coating agent to coat the cotton seeds, the control effect of the seed coating agent on cotton aphids in the seedling stage can be significantly improved, the damage caused by cotton aphids can be reduced, and the growth of cotton seedlings can be promoted.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for improving the effect of a neonicotinoid seed coating agent on controlling cotton aphids, comprising adding a synergistic substance to the neonicotinoid seed coating agent; the synergistic substance is brown algae powder or cellulase; the amount of the brown algae powder is 40g / L-200g / L; the amount of the cellulase is 80g / L-300g / L.

[0008] Furthermore, the neonicotinoid seed coating agent is a 30% thiamethoxam seed treatment suspension concentrate, and the dosage is 300 g / L. In addition to the 30% thiamethoxam seed treatment suspension concentrate, other commercial seed coating agents can be used as neonicotinoid seed coating agents, and the recommended dosage can be used.

[0009] Furthermore, the method for improving the effectiveness of neonicotinoid seed coating agents in controlling cotton aphids comprises the following steps: accurately weighing a synergistic substance, adding it to deionized water, and stirring for 3-5 minutes to fully dissolve it to obtain a solution; then, adding the neonicotinoid seed coating agent to the solution, stirring for 3-5 minutes to fully dissolve and mix it to obtain a slurry; using the slurry to coat cotton seeds, forming a uniform film, spreading it evenly, drying it, and preparing it for sowing; the ratio of cotton seeds to slurry is 25-50:1. The amount of deionized water used is: for 1L of slurry, the amount of brown algae powder is 40g / L-200g / L (the amount of cellulase is 80g / L-300g / L), the amount of 30% thiamethoxam seed treatment suspension is 300g / L, and the balance is deionized water.

[0010] Furthermore, the method is used to improve the effect of neonicotinoid seed dressing in controlling cotton aphids.

[0011] Brown algae powder is purified from algae through physical cold rolling extraction and nano-crushing centrifugal technology. It contains a variety of plant hormone substances such as auxin and cytokinin that promote seed germination. It also contains mineral elements such as calcium, manganese, iron and zinc that are incomparable to terrestrial plants. It can provide plants with growth nutrients and improve root vitality. It is widely used in agriculture, food, health care products and other aspects.

[0012] Cellulase, widely present in organisms in nature, is a general term for a group of enzymes that catalyze the hydrolysis of cellulose to produce glucose and low-polymerization fiber. It plays a biocatalytic role in decomposing cellulose and is used in many fields such as textiles, papermaking, and food fermentation. In particular, when plant seeds are germinating, cellulase can hydrolyze seed coat cellulose, which is beneficial to seed germination and growth.

[0013] It can be seen from the above technical solution that compared with the prior art, the present invention discloses a method for improving the effect of neonicotinoid seed dressing agents in controlling cotton aphids. By adding a certain concentration of synergistic substances - brown algae powder or cellulase to the basic neonicotinoid seed dressing agent, and optimizing the dosage of the synergistic substances, after being used for cotton seed coating, the control effect of the seed dressing agent on cotton aphids in the seedling stage can be significantly improved, and the damage caused by cotton aphids can be reduced. It has extremely high application value for improving the utilization rate of seed dressing agents, thereby reducing the use of seed dressing agents or other types of insecticides, and achieving reduced use of chemical pesticides and increased efficiency. DETAILED DESCRIPTION

[0014] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0015] Example 1

[0016] A method for improving the effectiveness of neonicotinoid seed dressings in controlling cotton aphids is as follows (according to the recommended dosage, 12 g of Ruisheng seed dressing is used per kilogram of cotton seeds, and 300 g of cotton seeds are used as an example in the example):

[0017] (1) Seed coating composition formula:

[0018] Commercial seed coating agent: 30% thiamethoxam seed treatment suspension concentrate (Ruisheng, Syngenta Nantong Crop Protection Co., Ltd.) 3.6g;

[0019] Synergistic substance: brown algae powder 0.5g;

[0020] and 7.9 mL of deionized water.

[0021] (2) Coating cotton seeds: ① Select the seeds, remove the poorly developed, shriveled seeds and bad seeds, weigh 300g of seeds, and place them in a ziplock bag; ② Use a one-thousandth balance to accurately weigh 0.5g of brown algae powder and put it into a beaker, add 7.9mL of deionized water, and stir it thoroughly with a vortex mixer at room temperature for 3-5min; ③ Weigh 3.6g of 30% thiamethoxam seed treatment suspension, add it to the above solution, stir for 3-5min to fully dissolve and mix, and the final concentration of brown algae powder in the seed coating composition is 42g / L; ④ Quickly pour the mixed slurry into the ziplock bag containing cotton seeds, with a seed-to-slurry ratio of 25:1, and shake it quickly for 2-3min. After forming a uniform drug film, spread it evenly, dry it, and prepare it for sowing.

[0022] Example 2

[0023] This embodiment differs from embodiment 1 in that the final concentration of brown algae powder in the seed coating composition is 83 g / L.

[0024] Example 3

[0025] This embodiment differs from embodiment 1 in that the final concentration of brown algae powder in the seed coating composition is 167 g / L.

[0026] Example 4

[0027] This embodiment differs from embodiment 1 in that 83 g / L of brown algae powder in the seed coating composition is replaced with 83 g / L of cellulase.

[0028] Example 5

[0029] This embodiment differs from embodiment 4 in that the final concentration of cellulase in the seed coating composition is 167 g / L.

[0030] Example 6

[0031] This embodiment differs from embodiment 4 in that the final concentration of cellulase in the seed coating composition is 250 g / L.

[0032] Comparative Example 1

[0033] This embodiment differs from embodiment 1 in that the seed coating composition includes 3.6 g of 30% thiamethoxam seed treatment suspension concentrate and 8.4 mL of deionized water, but does not include brown algae powder or cellulase.

[0034] Test plan for verifying the efficacy of the composition against cotton aphids

[0035] Cotton seeds coated in Examples 1-6 and Comparative Example 1 were sown in a cotton field at the Weixian Experimental Base in Hebei Province. The number of aphids per plant and the rate of leaf curl were investigated 33 days after sowing. The specific method is as follows:

[0036] (1) The soil in the experimental field was sandy loam with medium fertility. The cotton field was continuously planted. Irrigation was carried out in mid-April, and the soil was plowed and harrowed in the second half of the month before sowing.

[0037] (2) On April 28, 2023, the cotton variety Ji 863 was planted with film covering and sowing. The rows were 76 cm apart and the plant spacing was 30 cm. Three plots were planted in each treatment. The plots were 6 m long, 6 m wide and 36 m in area. 2 ;

[0038] (3) No pest control is carried out during the seedling stage, and other management measures are the same as those for field management;

[0039] (4) On May 31, 2023, the number of cotton aphids on cotton plants was investigated at 4 sampling points in each plot and 10 plants in each sampling point. The number of plants with curled leaves was also recorded. The results are shown in Table 1.

[0040] Table 1 Field test results of seed coating composition for controlling cotton aphids

[0041] deal with Number of cotton aphids per plant (heads / plant) Leaf curling rate (%) Example 1 36.2 31.6 Example 2 50.5 40.3 Example 3 60.5 46.4 Example 4 40.3 37.2 Example 5 45.7 47.2 Example 6 64.5 48.6 Comparative Example 1 92.9 58.7

[0042] The results in Table 1 show that the number of cotton aphids per plant and the rate of leaf curl in Examples 1-6 were lower than those in Comparative Example 1. Among the brown algae powder treatments in Examples 1-3, Example 1 performed the best, with the number of cotton aphids per plant and the rate of leaf curl significantly lower than those in Comparative Example 1. Among the cellulase treatments in Examples 4-6, Example 4 performed the best, with the number of cotton aphids per plant and the rate of leaf curl significantly lower than those in Comparative Example 1. These results demonstrate that adding 40g / L-200g / L of brown algae powder or 80g / L-300g / L of cellulase to thiamethoxam seed coating significantly improves the control of cotton aphids, with 42g / L of brown algae powder or 83g / L of cellulase being more preferred.

[0043] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for improving the control effect of neonicotinoid seed coating agents on cotton aphids, characterized in that: Adding a synergistic substance to the neonicotinoid seed coating agent; the synergistic substance is brown algae powder or cellulase; the amount of the brown algae powder is 40g / L-200g / L; the amount of the cellulase is 80g / L-300g / L; The neonicotinoid seed coating agent is a 30% thiamethoxam seed treatment suspension; the dosage is 300g / L.

2. The method for improving the control effect of neonicotinoid seed coating agents on cotton aphids according to claim 1, characterized in that: The following steps are involved: Accurately weigh the synergistic substance, add it to deionized water, and stir for 3-5 minutes to fully dissolve it to obtain a solution; Then, the neonicotinoid seed coating agent is added to the solution and stirred for 3-5 minutes to fully dissolve and mix to obtain a slurry; the slurry is used to coat the cotton seeds, and after forming a uniform film, it is spread evenly and dried for sowing; the ratio of the cotton seeds to the slurry is 25-50:

1.

3. Use of the method according to any one of claims 1 to 2 in improving the efficacy of neonicotinoid seed coating agents in controlling cotton aphids.