A seed treatment suspension agent containing thiamethoxam

Abstract

The present invention provides a seed treatment suspension agent containing thiamethoxam, which comprises the following components in weight percentage: thiamethoxam 10-50%, dispersant 0.5-10%, wetting agent 0.5-10%, biostimulant 0.1-2%, film-forming agent 1-5%, thickener 0.5-3%, preservative 1-3%, antifreezing agent 1-3%, pigment 0.5-2%, and deionized water to make up 100%; the film-forming agent is one or two of chitosan or carboxymethyl cellulose; the seed treatment suspension agent is used for seed treatment to control crop pests.

Description

Technical Field

[0001] The present invention relates to the technical field of pesticides, and in particular to a seed treatment suspension agent containing thiamethoxam and its uses. Background Art

[0002] Seed coating agents are special products for seed coating. Seed coating is a new technology developed on the basis of traditional seed soaking and dressing techniques. A seed coating agent is a pesticidal preparation with film-forming properties for treating crop or other plant seeds. Classified by the morphological dosage form of the seed coating agent, it can be divided into dry powder seed coating agents, suspension seed coating agents, colloidal suspension type seed coating agents, etc. Among them, the suspension seed coating agent first prepares a suspension and dispersion system by wet grinding of the active ingredient and additives, and then coats the seeds by atomization or other means. The production process of the suspension seed coating agent is relatively simple, and the coating effect is good. At present, the seed coating agents in China are mainly suspension type seed coating agents.

[0003] The active ingredient in the suspension seed coating agent can be a herbicide, an insecticide, a fungicide, a growth regulator, or a mixture of various formulations. There are certain requirements for the active ingredient in the suspension seed coating agent. The melting point > 70°C, and the technical material is granular; the solubility in water is relatively low, generally < 200 mg / L (20 - 40°C); the chemical properties of the active ingredient should be stable. The additives of the suspension seed coating agent include wetting agents, dispersants, antifreeze agents, defoaming agents, thickeners, film-forming agents, safeners, etc. When necessary, preservatives, pH regulators and other additives should also be added to the additives.

[0004] As the most crucial non-active ingredient of the seed coating agent, the film-forming agent directly affects the quality and application effect of the seed coating agent. The film-forming agent coats the surface of the seeds to form a breathable and water-absorbing film, so that the drug effect is slowly released to achieve the effect of preventing and controlling pests and diseases. Commonly used film-forming agents include starches and their derivatives, celluloses and their derivatives, synthetic polymers, and other natural substances. Due to the current requirements for high efficiency, safety and environmental friendliness of pesticidal preparations, some high-performance film-forming polymers and bio-based film-forming agents with good biocompatibility will receive more attention.

[0005] Thiamethoxam belongs to the second-generation neonicotinoid insecticides. Its mechanism of action is similar to that of the first-generation neonicotinoid insecticides such as imidacloprid, and it has high activity and safety. Thiamethoxam not only has contact, stomach toxicity, and systemic activity, but also has the characteristics of a broad insecticidal spectrum, high activity, and long residual period. It is very safe for animals, without mutagenic, teratogenic, or carcinogenic effects, and is also very safe for beneficial insects. During the application process, thiamethoxam has good insecticidal activity and has good control effects on pests of the Homoptera and Thysanoptera orders. Currently, the thiamethoxam seed treatment suspension on the market is mainly a 30% suspension seed coating agent. During the use process, it is found that its residual period is short and it cannot provide long-term protection for crops, and multiple sprays or other application methods are required in the field. In addition, the 30% thiamethoxam suspension seed coating agent on the market does not have the effect of promoting crop growth. Therefore, aiming at the deficiencies in the existing technology, the present invention provides a thiamethoxam suspension seed coating agent that can improve crop growth and has a long residual period. Summary of the Invention

[0006] The purpose of the present invention is to provide a thiamethoxam suspension seed coating agent that can improve crop growth and has a long residual period, so as to solve the technical problems such as short residual period existing in the prior art.

[0007] The specific technical solutions are as follows:

[0008] A seed treatment suspension containing thiamethoxam, comprising the following components in weight percentage: thiamethoxam 10-50%, dispersant 0.5-10%, wetting agent 0.5-10%, biostimulant 0.1-2%, film-forming agent 1-5%, thickener 0.5-3%, preservative 1-3%, antifreeze 1-3%, pigment 0.5-2%, deionized water to make up 100%; the film-forming agent is one or two of chitosan or carboxymethyl cellulose. Preferably, the film-forming agent is a combination of chitosan and carboxymethyl cellulose, and the mass ratio of chitosan to carboxymethyl cellulose is 1:3-3:1; particularly preferably, the mass ratio of chitosan to carboxymethyl cellulose is 1:1.

[0009] The dispersant is Tersperse2700 and YUS-WG5; the wetting agent is sodium dodecylbenzenesulfonate; the biostimulant is sodium humate and polyglutamic acid; the thickener is magnesium aluminum silicate and xanthan gum; the antifreeze is propylene glycol; the preservative is Kathon; the pigment is rose bengal. Preferably, the mass ratio of Tersperse2700 to YUS-WG5 is 5:1-1:1; the mass ratio of magnesium aluminum silicate to xanthan gum is 20:1-1:1; the mass ratio of sodium humate to polyglutamic acid is 1:2-2:1.

[0010] A seed treatment suspension containing thiamethoxam, comprising the following components in weight percentage: thiamethoxam 10 - 50%, Tersperse 2700 0.5 - 5%, YUS - WG5 0.5 - 5%, sodium dodecylbenzenesulfonate 0.5 - 5%, sodium humate 0.1 - 1%, polyglutamic acid 0.1 - 1%, chitosan 0.5 - 3%, carboxymethyl cellulose 0.5 - 3%, magnesium aluminum silicate 0.5 - 3%, xanthan gum 0.05 - 0.5%, propylene glycol 1 - 3%, Kathon 1 - 3%, rose bengal 0.5 - 2%, and deionized water to make up 100%.

[0011] Preferably, a seed treatment suspension containing thiamethoxam, comprising the following components in weight percentage: thiamethoxam 30%, Tersperse 2700 3%, YUS - WG5 1%, sodium dodecylbenzenesulfonate 1%, sodium humate 0.5%, polyglutamic acid 0.5%, chitosan 1.5%, carboxymethyl cellulose 1.5%, magnesium aluminum silicate 1%, xanthan gum 0.2%, propylene glycol 2.5%, Kathon 1.2%, rose bengal 0.8%, and deionized water to make up 100%.

[0012] The use of the thiamethoxam seed treatment suspension provided by the present invention for controlling crop pests, wherein the seed treatment suspension is used for seed treatment, and the crops include corn, rice, wheat, cotton, and rapeseed; the pests include aphids, planthoppers, and thrips. Preferably, it is used for treating corn seeds to control corn aphids.

[0013] Beneficial technical effects:

[0014] 1. The thiamethoxam suspension seed coating agent prepared by the present invention has a good long - term efficacy. After being used for seed treatment, it can significantly improve the control effect. 2. The thiamethoxam suspension seed coating agent prepared by the present invention is beneficial to promoting crop emergence and improving the growth indexes of crops. 3. The most important non - active ingredient in the seed coating agent is the film - forming agent. The characteristics of the film - forming agent affect the efficacy and long - term efficacy of the seed coating agent. The selected film - forming agent combination of chitosan + carboxymethyl cellulose in the present invention not only helps to improve the control effect of the agent, but also has a certain promoting effect on the growth of crops. Specific embodiments

[0015] The following further explains and illustrates the present invention in combination with specific embodiments.

[0016] Example 1: Effects of different film - forming agents on indoor corn emergence rate and growth performance

[0017] Test location: The glass greenhouse of our company

[0018] Test crop: Corn single - cross 909

[0019] Test reagents: Three film-forming agents, namely chitosan, carboxymethyl cellulose, and polyethylene glycol 6000, were respectively prepared into 30% thiamethoxam suspension seed coating agents according to the formulations in Table 1 (Formulations 1-5); Formulation 6 (the same as Formulation 1; without film-forming agent); CK1: 30% thiamethoxam seed treatment suspension (Syngenta, Switzerland); CK2: 30% thiamethoxam suspension seed coating agent (Jiangsu Aijin).

[0020] Table 1: Formulations of 30% thiamethoxam suspension seed coating agent

[0021]

[0022]

[0023] Preparation method: First, weigh the film-forming agent according to the preset ratio and add a certain amount of dispersant. After mixing evenly, shear it with a high-shear mixing emulsifier, then add the colorant and shear it with a high-speed shear mixing emulsifier. Weigh and mix evenly the technical material, dispersant, biostimulant, thickener, solvent, etc. according to the pre-calculated material ratio. Transfer the slurry into a sand mill, start the motor, and perform sand milling. After the particle size is detected to be qualified, it can be discharged. Referring to the detection of the control item indicators of the suspension seed coating agent, suspension seed coating agents with excellent preparation performance were obtained for the preparations of Formulations 1-5.

[0024] Test method: The potting method was adopted. The test soil was quantitatively filled to 4 / 5 of the pot. Select plump and uniform corn seeds for sowing. There were 100 pots for each treatment, with 1 seed per pot. Indoor cultivation was carried out using the same cultivation management method. After a period of time, the emergence rate was investigated; and at the three-leaf and one-heart stage, 10 seedlings were randomly selected to measure the corn growth indicators.

[0025] Test results: As can be seen from Table 2, after the thiamethoxam suspension seed coating agent was used to treat the seeds at a dosage of 500 mL / 100 Kg, the film-forming agents in Formulations 4 and 5 (chitosan + polyethylene glycol 6000, or carboxymethyl cellulose + polyethylene glycol 6000) both inhibited the emergence of corn. Compared with the clear water control, the film-forming agent in Formulation 2 had a certain promoting effect on the emergence of corn; however, there was no significant difference in the emergence rate among Formulation 2, Formulation 3, Formulation 6, CK1, CK2 and the clear water CK treatments. Compared with other formulations, the film-forming agent (chitosan + carboxymethyl cellulose combination) selected in Formulation 1 could significantly improve the emergence rate of corn, showing a significant difference from other treatments.

[0026] Table 2 Effects of thiamethoxam suspension seed coating agents with different film-forming agents on the emergence rate of corn

[0027]

[0028] Note: Different lowercase letters indicate significant differences in values (P<0.05)

[0029] As shown in Table 3, after the thiamethoxam suspension seed coating agent was treated with a dosage of 500 mL / 100 kg of seeds, the film-forming agent (carboxymethyl cellulose + polyethylene glycol 6000) in formula 5 inhibited the growth of corn. Compared with other formulas, the film-forming agent (chitosan + carboxymethyl cellulose combination) in formula 1 can significantly improve the growth of corn, with significant differences. In addition, there was no significant difference in root length among the treatments.

[0030] Table 3 Effects of different film-forming agents, thiamethoxam suspension seed coating agents, on growth indicators of corn seedlings

[0031]

[0032] Note: Different lowercase letters indicate significant differences (P<0.05)

[0033] Example 2: Effects of different film-forming agent selections on the control of corn aphids

[0034] Test location: corn test field

[0035] Test crop: Corn Suyu No. 10

[0036] Test agent: the agent in Example 1

[0037] Test method: Before sowing, prepare each agent into a slurry according to the ratio of 100kg of seeds to 2L of water. Stir the prepared solution with the seeds thoroughly to evenly distribute the solution on the seeds, spread them out to dry, and then use them for single seed sowing.

[0038] Methodology:

[0039] Aphids were investigated three times, 15, 30, and 60 days after corn seedlings were established. 100 corn plants were randomly selected from each plot, and the number of aphids was recorded.

[0040] Calculation method:

[0041] Control effect (%) = (number of aphids in the control area - number of aphids in the treatment area) / number of aphids in the control area × 100.

[0042] Test results: As shown in Table 4, 15 days after corn seedlings, except for formula 6, there was no significant difference in the control effect between the other treatments. 30 days after corn seedlings, the control effect of formula 1 on aphids was 91.4%, which was significantly different from other treatments. 60 days after corn seedlings, the control effect of formula 1 on aphids was 86.6%, which was significantly different from other treatments. According to the comparison between formula 1 and formulas 2-5, it was found that the choice of film-forming agent will have a significant effect on the lasting effect of the agent. When chitosan + carboxymethyl cellulose composite film-forming agent is used in formula 1, the lasting effect of thiamethoxam suspension seed coating agent will be significantly increased; it is conducive to the efficient prevention and control of pests.

[0043] Table 4: Influence of Different Film-Forming Agent Selections on the Control Effect of Field Maize Aphids

[0044]

[0045]

[0046] Note: Different lowercase letters indicate significant numerical differences (P < 0.05).

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it.

Claims

1. A seed treatment suspension agent containing thiamethoxam, characterized in that, It contains the following components in weight percentage: thiamethoxam 30%, Tersperse 2700 3%, YUS-WG5 1%, sodium dodecylbenzenesulfonate 1%, sodium humate 0.5%, polyglutamic acid 0.5%, chitosan 1.5%, carboxymethyl cellulose 1.5%, magnesium aluminum silicate 1%, xanthan gum 0.2%, propylene glycol 2.5%, Kathon 1.2%, rhodamine 0.8%, and deionized water to make up 100%.

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