CN108552183B - Suspended seed coating agent of difenapyr and its application - Google Patents

Abstract

The present invention relates to a suspension seed coating of pyraclostrobin and its application. The fenflu-fen-prop-prop suspension seed coating agent comprises the following components in parts by weight: 5-80 parts of fen-diflufen-ethyl, 0.1-10 parts of wetting agent, 0.1-10 parts of dispersant, and 0.1-5 parts of thickener 1 to 5 parts of film-forming agent, 0.1 to 10 parts of antifreeze, 0.1 to 5 parts of defoamer, 0.1 to 5 parts of warning agent, 0.1 to 5 parts of preservative, and the balance of deionized water. The pyriflufen-ethyl suspension seed coating agent of the present invention complies with the quality standard of the suspension seed coating agent, and the pyrifenapyr suspension seed coating agent provided by the present invention is used for seed treatment, and the herbicide spray is combined. The mixed spraying technology of carzapyr and herbicides can significantly improve the resistance of crops to herbicides, improve the control effect of herbicides on weeds, and reduce the dosage of herbicides.

Description

Suspended seed coating agent of difenapyr and its application

technical field

The invention relates to the technical field of pesticides, in particular, to a suspension seed coating of pyrfenapyr and its application.

Background technique

According to reports, the occurrence area of weeds in wheat fields in my country accounts for more than 55% of the planting area, the serious damage area accounts for 28%, and the average yield loss is 15%. This has resulted in a serious reduction in wheat production or even no harvest. At the same time, with the continuous increase of labor costs in my country, the use of herbicides to control weeds in wheat fields has become a necessary measure for wheat production. However, due to the close kinship with wheat, it is difficult for herbicides to obtain high selectivity between wheat and grass weeds, resulting in serious herbicides that can be used to control grass weeds in wheat fields. lack. At present, the only herbicide that can effectively prevent and control the wheat in my country is metsulfuron-methyl, but metsulfuron-methyl has a high risk of phytotoxicity to wheat and is prone to phytotoxicity, so it is usually used in metsulfuron-methyl preparations. The safener pyraclosulfate was added, and the two mixed sprays were used to protect wheat and improve the resistance of wheat to metsulfuron without affecting weeds such as wild oats.

However, the applicant found through research that the following problems existed in the process of mixing and spraying of fenflufen-ethyl as a safener and herbicide: (1) Although fenflufen-ethyl has no effect on weeds such as wild oats, it has no effect on the Weeds such as wheat have a protective effect, which can improve their resistance to herbicides, reduce the control effect of herbicides on weeds such as Jiejie, and ultimately lead to a substantial increase in the dosage of herbicides. (2) The part where the compound can be absorbed by the plant and the direction of conduction in the plant has a strong specificity. For example, pyrimethamine and its analogs can effectively prevent and control apple powdery mildew by stem and leaf spray, but it is ineffective when applied from the root. . At present, the use of pyrafenpyr is added to herbicide formulations, sprayed on stems and leaves, and absorbed by stems and leaves, and whether pyrazin is active in other application parts of crops and its effect The effect has not yet been reported. (3) The melting point of pyraclostrobin is 50～52℃, which belongs to low melting point. After the low-melting technical drug is made into a suspension agent, the problems of delamination, solidification and suspension rate decrease are prone to occur.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problems, the present invention provides a suspension seed coating of pyraclostrofen-ethyl, which not only improves the resistance of wheat to herbicides, but also can improve the control effect of herbicides on weeds such as juniper. , reduce the dosage of herbicides. In addition, the suspended seed coating agent also has the characteristics of good stability.

The present invention is realized by adopting the following technical solutions.

A kind of pyraclostrofen suspension seed coating agent, comprising the following components by weight:

5 to 80 parts of difenapyr,

Wetting agent 0.1 to 10 parts,

0.1 to 10 parts of dispersant,

Thickener 0.1 to 5 parts,

1 to 5 parts of film-forming agent,

Antifreeze 0.1 to 10 parts,

0.1 to 5 parts of defoamer,

Warning agent 0.1 to 5 copies,

Preservatives 0.1 to 5 parts,

Deionized water balance.

Preferably, the pyraclostrofen suspension seed coating agent comprises the following components in parts by weight:

10 to 50 parts of difenapyr,

1 to 7 parts of wetting agent,

1 to 7 parts of dispersant,

Thickener 0.1 to 3 parts,

1 to 3 parts of film-forming agent,

1 to 5 parts of antifreeze,

0.5 to 3 parts of defoamer,

Warning agent 0.1 to 2 copies,

Preservatives 0.5 to 3 parts,

Deionized water balance.

More preferably, the fenflu-fen-prop-prop suspension seed coating is composed of the following components by weight: fenflufen-ethyl 30%, wetting agent 4%, dispersing agent 5%, thickening agent 1.1%, Film agent 2%, antifreeze agent 2%, defoamer 1.5%, warning agent 0.5%, preservative 1%, deionized water to make up the balance.

In the pyrazolyl-methyl suspension seed coating agent, the wetting agent can be styryl phenol polyoxyethylene polyoxypropylene ether, alkylphenol formaldehyde resin polyoxyethylene ether, benzyl dimethylphenol polyoxyethylene Oxyethylene ether, nonylphenol polyoxyethylene ether, octylphenol polyoxyethylene ether, 9-octadecenamine, castor oil polyoxyethylene ether, pulling powder (sodium diisobutylnaphthalene sulfonate), dodecyl One or more of sodium alkyl benzene sulfonate, sodium lauryl sulfate, sodium dioctyl succinate sulfonate, sodium diisopropyl naphthalene sulfonate, tridecyl polyoxyethylene ether; preferably, The wetting agent can be one or more of alkylphenol formaldehyde resin polyoxyethylene ether, nonylphenol polyoxyethylene ether, castor oil polyoxyethylene ether; more preferably, the wetting agent is Alkylphenol formaldehyde resin polyoxyethylene ether.

The dispersing agent can be sodium lignosulfonate, calcium lignosulfonate, ammonium lignosulfonate, NNO (sodium naphthalene sulfonate formaldehyde condensate), NO (dibutylnaphthalene sulfonate sodium formaldehyde condensate), diffusion Agent MF (sodium methylnaphthalene sulfonate formaldehyde condensate), pull powder (sodium diisobutylnaphthalene sulfonate), fatty alcohol ethylene oxide adduct phosphate, alkylphenol polyoxyethylene ether phosphate , SOPA (alkylphenol polyoxyethylene ether formaldehyde condensate sulfate), polyoxyethylene polyoxypropylene ether block copolymer, alkylphenol polyoxyethylene phosphate, gum arabic, lecithin, carboxymethyl fiber One or more of polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene glycol; preferably, the dispersing agent can be: sodium lignosulfonate, NNO, polyoxyethylene polyoxypropylene ether block copolymer One or more of polyoxyethylene phosphate, alkylphenol polyoxyethylene phosphate, and polyvinylpyrrolidone; more preferably, the dispersant is NNO and/or polyoxyethylene polyoxypropylene ether block copolymer.

The thickener can be gypsum, clay, magnesium aluminum silicate, water glass, sodium carboxymethyl starch, soluble starch, sodium carboxymethyl cellulose, sodium alginate, agar, xanthan gum, hydroxyethyl cellulose , one or more of bentonite; preferably, the thickener can be one or more of aluminum magnesium silicate, xanthan gum, sodium alginate, hydroxyethyl cellulose; more preferably, The thickener is magnesium aluminum silicate and/or xanthan gum.

The film-forming agent can be sodium alginate, agar, polyvinyl alcohol, polyethylene glycol, polyvinyl acetate, polyacrylamide, polyvinyl acetate, polyvinylpyrrolidone, poly(meth)acrylic acid derivatives, polyvinyl One or more of alcohol polymer, ethyl cellulose, hydroxypropyl cellulose, polyacetolactone, polyacrylamide; preferably, the film-forming agent can be polyvinyl alcohol, polyethylene glycol, one or more of polyacrylamides; more preferably, the film former is polyethylene glycol.

The antifreeze can be one or more of ethylene glycol, propylene glycol, glycerol, urea, glycerin, glycerol-diethyl ether diethylene glycol, and methyl propylene diethylene glycol; preferably, the antifreeze can be is one or more of ethylene glycol, glycerol, and urea; more preferably, the antifreeze is urea.

The defoamer can be one or more of isooctyl alcohol, isoamyl alcohol, stearic acid, and lauric acid; preferably, the defoamer is isooctanol.

The warning agent can be one or more of Scarlet Scarlet, Rhodamine, Rhodamine 2B; preferably, the warning agent is Rhodamine.

The preservative can be formaldehyde, sodium salicylate, sodium benzoate, 1,2-benzothiazolin-3-one, 2-hydroxybiphenyl, sorbic acid, benzoic acid, benzaldehyde, p-hydroxybenzaldehyde, p-hydroxybenzaldehyde One or more of methyl hydroxybenzoate and isothiazolinone (casone); preferably, the preservative is isothiazolinone.

Various raw materials and reagents used in the present invention are commercially available and can be easily obtained. For example, the original drug of pyraclostrobin can be purchased from Jiangsu Tianrong Group Co., Ltd., alkylphenol formaldehyde resin polyoxyethylene ether (Nongru No. 700) can be purchased from Hebei Yancheng Chemical Auxiliary Co., Ltd., and NNO can be purchased from Guangzhou City Chuangyu Chemical Technology Co., Ltd., polyoxyethylene polyoxypropylene ether block copolymer (polyether F-68) was purchased from Sunda Chemical (Nantong) Co., Ltd., etc.

The pyraclostrofen suspension seed coating agent of the present invention can be prepared by adopting the conventional preparation method of the suspension seed coating agent in the art.

In the present invention, the preparation method of the pyrfenapyr suspending seed coating comprises:

The various components are sieved (such as 320 mesh), mixed with deionized water in proportion, pre-dispersed with high-speed stirring for 30 minutes, and the system is controlled below 45°C, and impurities are removed. It is preferable to use a sand mill for sanding, the sanding medium is zirconium beads, the medium coefficient is 1, the sanding is 2.5 hours, and the sanding temperature is controlled below 45 °C.

The present invention also provides application of the pyraclostrofen suspension seed coating agent in preventing and controlling weeds in wheat fields. Specifically, the wheat seeds are coated by using the pyraclostrofen suspension seed coating agent.

The wheat field weeds described in the present invention are mainly grass weeds, broadleaf weeds and sedge weeds. Preferably, the weeds in the wheat field are selected from the group consisting of sclerotium, brome, brome, ryegrass, japonica, bluegrass, serratia, hard grass, club grass, multiflora ryegrass, One or more of barley, candle grass, goat grass, cylindrical goat grass, sagebrush, shepherd's purse, maijiagong, wheat bottle grass, quinoa, bowl flower, sedge, etc. More preferably, the weeds in the wheat field are S. japonica and/or Artemisia annua.

In a specific application, the active ingredient dosage of the pyriflufen-ethyl suspended seed coating agent is 1-2000g/100kg of seeds. Preferably, the dosage of the pyrfenapyr suspending seed coating agent is 10-1000g/100kg of seeds. More preferably, the dosage of the pyriflufen-ethyl suspension seed coating agent is 20-500g/100kg of seeds.

In the specific application, the consumption of the fenflu-fen-prop-prop suspension seed coating agent is 1.875-3750g/hm ² ; preferably, the consumption of the fenflufen-ethyl suspended seed coating agent is 18.75-1875g/hm ² ; Further preferably, the dosage of the fenflu-fen-prop-prop suspension seed coating agent is 37.5-937.5 g/hm ² ; more preferably, the dosage of the fenflu-fen-ethyl suspended seed coating agent is 45-375 g/hm ² .

In the specific application, the pyriflufen-ethyl suspension seed coating agent is used in combination with methyldisulfuron, for example, the seeds are coated with the pyriflufen-ethyl suspension seed coating agent, and then the methyl disulfonic acid is sprayed. It can achieve better effect; preferably, the consumption of the fenflu-fen-ethyl suspension seed coating agent is 1.875-3750g/hm ² ; further preferably, the consumption of the fenflufen-ethyl suspended seed coating agent It is 18.75-1875g/hm ² ; more preferably, the dosage of the fenflu-fen-ethyl suspension seed coating agent is 37.5-937.5g/hm ² ; more preferably, the fenflufen-ethyl suspended seed coating agent The dosage is 45-375 g/hm ² ; the dosage of the methyldisulfuron is preferably 8-20 g/hm ² .

The present invention has the following positive beneficial effects:

1. The pyrazin suspension seed coating agent of the present invention is used in conjunction with herbicides to prevent and treat weeds in wheat fields, and by the coating treatment of wheat seeds, the protection of pyrazin-fen-ethyl to weeds such as Jiejie is avoided, It can significantly improve the control effect of herbicides on weeds such as Jiejie, and reduce the dosage of herbicides.

2. The present invention has prepared a quality-qualified fenflu-fen-ethyl suspension seed coating through a large number of screenings and researches, and solved the problems that the fen-flufen-ethyl suspension agent is prone to delamination, solidification, and a drop in the suspension rate;

3. The suspension seed coating of pyraclostrobin of the present invention is combined with herbicides to control weeds in wheat fields, which can significantly improve the resistance of wheat to herbicides and reduce the phytotoxicity of herbicides;

Detailed ways

The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

If no specific technique or condition is indicated in the examples, the technique or condition described in the literature in the field or the product specification is used.

The reagents or instruments used without the manufacturer's indication are conventional products that can be purchased through regular channels.

Unless otherwise specified, the percentages in all the examples and experimental examples of the present invention refer to weight percentages.

Example 1 30% mezafen-prop-prop-prop suspension seed coating

In terms of mass percentage, the formula is as follows:

Meafenpyr 30%, Alkylphenol Formaldehyde Resin Polyoxyethylene Ether 4%, NNO 2%, Polyoxyethylene Polyoxypropylene Ether Block Copolymer 3%, Aluminum Magnesium Silicate 1%, Xanthan Gum 0.1% , polyethylene glycol 2%, urea 2%, isooctanol 1.5%, rose essence 0.5%, isothiazolinone 1%, deionized water to make up the balance.

Example 2 10% Mezafenapyr Suspension Seed Coating Agent

In terms of mass percentage, the formula is as follows:

Meafenpyr 10%, Nonylphenol Ethoxylate 2%, NNO 1%, Alkylphenol Polyoxyethylene Phosphate 1%, Aluminum Magnesium Silicate 0.5%, Hydroxyethyl Cellulose 0.1%, Polyurethane Vinyl alcohol 3%, ethylene glycol 5%, isoamyl alcohol 1%, acid scarlet 1%, sorbic acid 1.5%, deionized water make up the balance.

Example 3 40% pyraclostrofen suspension seed coating

In terms of mass percentage, the formula is as follows:

Meafenpyr ethyl 40%, castor oil polyoxyethylene ether 8%, sodium lignosulfonate 4%, alkylphenol polyoxyethylene phosphate 5%, sodium alginate 2%, polyacrylamide 3%, propylene Triol 3%, lauric acid 2%, Ruominda 2B 2%, benzoic acid 2%, deionized water make up the balance.

Effect test 1:

The present invention also provides a series of adjuvant comparative tests, which are used to verify the remarkable effect of the specific selection of each adjuvant in the pyrazin-carbofen suspension seed coating agent described in Example 1 of the present invention.

1. Comparative test of wetting agent and dispersing agent

(1) Primary screening of wetting agents and dispersing agents

The wetting agent and dispersing agent were initially screened by the flow point method. First dissolve the wetting agent or dispersing agent with water, make it into an aqueous solution with a mass fraction of 5%, and then accurately weigh 2.0000g of the pre-crushed pyraclostrobin in a 20mL test tube, and weigh the mass of the test tube. ; Add 5% aqueous solution of wetting agent or dispersing agent drop by drop, add a few drops and mix with ultrasonic waves, when the viscous substance can just slide down the test tube wall, weigh it again, the quality difference before and after (m) That is, the quality of the dripping wetting agent or dispersing agent solution, the flow point of the wetting and dispersing agent to pyriflufen-ethyl can be expressed by m divided by the quality of the original drug, the smaller the flow point is, the wetting, The better the dispersion effect. The same wetting and dispersing agent were tested 3 times respectively, and the average value was taken.

Table 1 The results of preliminary screening of the wetting agent and dispersing agent of pyraclostrobin suspended seed coating agent (flow point method)

The results of the initial screening of wetting agents and dispersing agents are shown in Table 1. Select the wetting agent castor oil polyoxyethylene ether, nonylphenol polyoxyethylene ether, alkylphenol formaldehyde resin polyoxyethylene ether and dispersant NNO, polyoxyethylene polyoxypropylene ether embedded with smaller flow point (less than 1.00). Block copolymer, polyvinylpyrrolidone, sodium lignosulfonate, alkylphenol polyoxyethylene phosphate were further tested.

(2) Screening of wetting agents and dispersing agents

The wetting and dispersing agents initially screened were further screened by trial method to determine the specific types. The wetting agent and dispersing agent that were initially screened were combined in different ways, mixed with 30 g of pyrafenacet (Zhebai), water was added to 100 g, zirconium beads were used as the medium, the medium coefficient was 1, and the sand was milled for 2.5 hours. The grinding temperature is controlled below 45° C. to obtain a 30% pyriflufen-ethyl suspension. The types of wetting agents and dispersing agents were determined with the suspension rate, viscosity and dispersibility as indicators respectively.

The dispersibility was measured by the visual classification method: put 99.5mL of standard hard water in a 100mL graduated cylinder, use a pipette to take a 0.5mL sample of the suspension to be tested, drop it into the water from a distance of 5cm from the water surface of the graduated cylinder, and observe its dispersion status. It is divided into 8 grades according to the quality of its dispersion.

Level 1: It cannot automatically disperse in water, and it quickly sinks to the bottom in the form of a lump, and no turbid liquid appears;

Level 2: It cannot automatically disperse in water, sinks in a clump shape, the sinking speed slows down slightly, a turbid liquid appears, and finally all the samples sink to the bottom;

Level 3: It cannot be automatically dispersed in water, there is obvious turbid liquid, and some samples sink to the bottom in a lump;

Level 4: It can automatically disperse in water, form agglomerates, and the particles slowly descend, 1/3 of the turbid liquid appears in the graduated cylinder, and some samples sink to the bottom;

Level 5: Automatically disperse in water, slowly descending as a cloudy mass, 1/2 of the turbid liquid appears in the graduated cylinder, and some samples sink to the bottom;

Level 6: Automatically disperse in water, slowly descending as a cloudy mass, 3/4 of the turbid liquid appears in the graduated cylinder, and a small part of the sample sinks to the bottom;

Level 7: Automatically disperse in the form of a cloud and mist in the water, no obvious particle clusters fall slowly, and the turbid liquid diffuses rapidly;

Grade 8: It will automatically disperse in the form of a cloud and mist in the water, and the turbid liquid will form rapidly.

Table 2 Screening results of the types of wetting agent and dispersing agent of pyraclostrofen suspension seed coating agent (trial method)

The screening results of wetting agents and dispersing agents show that the wetting agents are nonylphenol polyoxyethylene ether, alkylphenol formaldehyde resin polyoxyethylene ether, castor oil polyoxyethylene ether, and the dispersing agents are NNO, polyoxyethylene polyoxyethylene In the case of propylene ether block copolymer and alkylphenol polyoxyethylene phosphate ester, the suspension rate is high (90.4-92.8%), the dispersibility is good (7-8 grades), and the viscosity is moderate (303-377mPs s), and the obtained suspension Liquid quality is good. Among them, when the wetting agent is alkylphenol formaldehyde resin polyoxyethylene ether, and the dispersing agent is NNO and polyoxyethylene polyoxypropylene ether block copolymer, the obtained suspension has the best quality, the dispersibility is 8 grades, and the viscosity is moderate (332mPs· s), the suspension rate is 92.4%, which is the preferred choice of the present invention. Therefore, the next step is carried out with the alkylphenol formaldehyde resin polyoxyethylene ether as the wetting agent and NNO and the polyoxyethylene polyoxypropylene ether block copolymer as the dispersing agent. test.

(3) Screening of dispersant ratio

The screened dispersants were further screened by trial method to determine the usage ratio. Mix NNO and polyoxyethylene polyoxypropylene ether block copolymer according to different proportions, mix with 4g wetting agent alkylphenol formaldehyde resin polyoxyethylene ether, 30g pyraclostrobin (100%), add water to 100g, Using zirconium beads as the medium, the medium coefficient is 1, sanding for 2.5 hours, and the sanding temperature is controlled below 45°C, to prepare a 30% pyraclostrobin suspension. The optimum ratio of dispersant was determined by taking the suspension rate, viscosity and dispersibility as indicators.

Table 3 Screening results (trial method) of dispersant ratio of pyraclostrofen suspension seed coating agent

The screening results of dispersant ratio show that: when the ratio of NNO and polyoxyethylene polyoxypropylene ether block copolymer is 1:2, 1:3, 2:3, 2:4, 2:5, 2:6, the suspension High rate (90.3%-93.4%), good dispersibility (7-8 grades), moderate viscosity (251-362 mPs·s), and the obtained suspension is of good quality. Among them, when the ratio of NNO and polyoxyethylene polyoxypropylene ether block copolymer is 2:3, the quality of the suspension obtained is the best, the dispersibility is 8 grades, the viscosity is moderate (340mPs·s), and the suspension rate is 93.4%, which is the invention of the present invention. The preferred solution, therefore, takes NNO: polyoxyethylene polyoxypropylene ether block copolymer=2:3 as the dispersant to carry out the next test.

2. Thickener comparison test

Thickener screening was carried out empirically. Mix different thickeners with wetting agent alkylphenol formaldehyde resin polyoxyethylene ether 4g, dispersant NNO 2g, polyoxyethylene polyoxypropylene ether block copolymer 3g, and pyrafenacet 30g (100%), Add water to 100 g, use zirconium beads as the medium, the medium coefficient is 1, sand mill for 2.5 hours, and control the sand milling temperature below 45° C. to obtain a 30% pyrazin-carbofen suspension. The types of thickeners were determined with viscosity, suspension rate and thermal storage stability as indicators.

Table 4 Screening results of pyraclostrofen suspension seed coating thickener thickener

The screening results of thickeners show that when the thickeners are aluminum magnesium silicate, sodium alginate, xanthan gum and hydroxyethyl cellulose, the suspension rate is high (89.5%-97.8%) and the viscosity is moderate (242-506mPs·s). ), the heat storage stability is better, and the quality of the obtained suspension is better (Table 4). Among them, when the ratio of magnesium aluminum silicate and xanthan gum is 1:0.1, the quality of the obtained suspension is the best, the suspension rate is 97.3%, the viscosity is moderate (325mPs s), and the thermal storage is stable, which is the preferred solution of the present invention. Therefore, The next experiment was carried out with magnesium aluminum silicate and xanthan gum (mass ratio 1:0.1) as thickeners.

3. Comparative test of the dosage of wetting agent, dispersing agent and thickening agent

The interaction between the wetting agent, dispersing agent and thickening agent was clarified by orthogonal test, and the final dosage was determined. Wetting agent (alkylphenol formaldehyde resin polyoxyethylene ether), dispersing agent (NNO: polyoxyethylene polyoxypropylene ether block copolymer = 2:3), thickener (aluminum magnesium silicate: xanthan gum) =1:0.1) Mix with 30g (100%) of pyraclostrobin in different dosages, add water to 100g, use zirconium beads as the medium, the medium coefficient is 1, sand for 2.5h, and the sanding temperature is controlled below 45 ℃ , to obtain a 30% suspension of diflufenapyr. Determine the dosage of wetting agent, dispersing agent and thickening agent according to the index of suspension rate.

Table 5 Screening results of the dosage of pyraclostrofen suspension seed coating agent wetting agent, dispersing agent and thickening agent

Note: Wetting agent is alkylphenol formaldehyde resin polyoxyethylene ether, dispersant is NNO: polyoxyethylene polyoxypropylene ether block copolymer = 2:3, thickener is aluminum magnesium silicate: xanthan gum = 1:0.1.

The screening results of the dosage of wetting agent, dispersing agent and thickening agent show that the dosage of wetting agent, dispersing agent and thickening agent is 4%+5%+1.1%, 5%+5%+0.1%, 3%+5% +0.5%, 5%+4%+1.1%, 3%+4%+0.1%, 4%+4%+0.5%, 5%+6%+0.5%, the suspension rate is high (90.0%～98.3 %), the quality of the obtained suspension was better (Table 5). Among them, wetting agent (alkylphenol formaldehyde resin polyoxyethylene ether) 4%, dispersant (NNO: polyoxyethylene polyoxypropylene ether block copolymer = 2:3) 5%, thickener (aluminum silicate) Magnesium: xanthan gum=1:0.1) 1.1% of the obtained suspension has the best quality, and the suspension rate is 98.3%, which is the preferred solution of the present invention. Therefore, 4% of alkylphenol formaldehyde resin polyoxyethylene ether is used as the wetting agent , NNO 2% + polyoxyethylene polyoxypropylene ether block copolymer 3% as dispersant, aluminum magnesium silicate 1% + xanthan gum 0.1% as thickener for the next test.

4. Comparison test of types and dosages of film formers

The types and dosages of film-forming agents were screened by empirical method. Different film formers and wetting agents, alkylphenol formaldehyde resin polyoxyethylene ether 4g, dispersant NNO 2g, polyoxyethylene polyoxypropylene ether block copolymer 3g, thickener aluminum magnesium silicate 1g, xanthan gum Mix 0.1g and 30g (folded) of difenapyr, add water to 100g, use zirconium beads as the medium, the medium coefficient is 1, sand mill for 2.5h, and control the sand mill temperature below 45°C to obtain 30% pyrazole chlorfenapyr suspension. Pipette 1 mL of the prepared suspension into a petri dish, add 50 g of wheat seeds, cover and shake for 5 minutes, open the lid, spread the coated seeds flat to form a film, observe the surface of the seeds, and record the film formation time (the time it takes for the seed coating on all seed surfaces to cure into a film) and measure the coating uniformity and shedding rate.

Table 6 Screening results of the types and dosages of the film-forming agent of pyraclostrofen suspension seed coating agent

Numbering film former Quality Score/% Film formation time/min Evenness/% Drop rate/% 1 polyvinyl alcohol 1 6 86.5 9.6 2 polyvinyl alcohol 2 6 87.0 8.4 3 polyvinyl alcohol 3 6 92.9 4.8 4 polyvinyl alcohol 4 4 92.0 1.4 5 polyvinyl alcohol 5 3 92.0 0.8 6 polyethylene glycol 1 6 86.4 6.6 7 polyethylene glycol 2 5 95.7 3.4 8 polyethylene glycol 3 5 92.8 1.3 9 polyethylene glycol 4 5 90.6 0.6 10 polyethylene glycol 5 3 89.5 0.2 11 Polyacrylamide 1 6 86.9 6.6 12 Polyacrylamide 2 5 86.6 6.4 13 Polyacrylamide 3 5 93.5 5.8 14 Polyacrylamide 4 4 94.6 3.2 15 Polyacrylamide 5 4 86.8 2.8

The screening results of the type and dosage of film-forming agents show that when the dosage of polyvinyl alcohol is 3% to 5%, the dosage of polyethylene glycol is 2% to 4%, and the dosage of polyacrylamide is 3% to 4%, the coating uniformity is high (90.6%). ～95.7%), low shedding rate (0.2%～6.6%), short film forming time (3～6min), and good film forming effect (Table 6). Among them, when the polyethylene glycol dosage is 2%, the uniformity is 95.7%, the shedding rate is 3.4%, and the film forming time is 5 minutes, and the dosage is small and the cost is low, which is the preferred solution of the present invention. Therefore, 2% polyethylene glycol is used as the The film-forming agent was tested in the next step.

5. Comparative test of antifreeze type and dosage

The type and amount of antifreeze were screened by empirical method. Different antifreeze and wetting agent alkylphenol formaldehyde resin polyoxyethylene ether 4g, dispersant NNO 2g, polyoxyethylene polyoxypropylene ether block copolymer 3g, thickener aluminum magnesium silicate 1g, xanthan gum 0.1g g. Mix 2 g of polyethylene glycol as a film-forming agent, and 30 g of pyrfenapyr (100%), add water to 100 g, use zirconium beads as the medium, the medium coefficient is 1, sand for 2.5 hours, and the sanding temperature is controlled at 45 ° C In the following, a 30% suspension of diflufenapyr was prepared. The prepared suspension was placed at 0±1°C for 7 days, and returned to room temperature after 7 days, and the viscosity, suspension rate and sieve analysis were measured.

Table 7 Screening results of the types and dosages of antifreeze agents for pyraclostrofen suspension seed coating

Numbering antifreeze Quality Score/% Viscosity/mPs s Suspension rate/% Sieve analysis/% 1 Ethylene Glycol 1 322 80.0 97.7 2 Ethylene Glycol 2 383 91.2 98.4 3 Ethylene Glycol 3 330 93.1 98.9 4 Ethylene Glycol 4 299 93.3 99.6 5 Ethylene Glycol 5 278 93.4 99.0 6 Glycerol 1 324 86.7 97.6 7 Glycerol 2 424 88.6 99.4 8 Glycerol 3 363 89.5 99.1 9 Glycerol 4 325 94.3 99.2 10 Glycerol 5 419 96.4 99.9 11 Urea 1 347 88.7 97.6 12 Urea 2 373 94.9 99.7 13 Urea 3 262 94.8 99.0 14 Urea 4 403 93.8 99.7 15 Urea 5 397 95.4 99.1

The screening results of the type and dosage of antifreeze show that: when ethylene glycol is 4%-5%, glycerol 4%-5%, and urea is 2%-5%, the suspension rate is high (91.2%-96.4%) after the cold storage test. , high sieve separation (99.0% ~ 99.9%), moderate viscosity (Table 7). Wherein, when the amount of urea is 2%, the viscosity is moderate (373mPs·s) after storage at low temperature, the suspension rate is 94.9%, the sieving rate is 99.7%, and the amount is small and the cost is low, which is the preferred solution of the present invention. Therefore, urea 2 % is the antifreeze agent for the next test.

6. Comparative test of type and dosage of defoamer

The type and dosage of defoamer were screened by empirical method. Different defoamer and wetting agent alkylphenol formaldehyde resin polyoxyethylene ether 4g, dispersant NNO 2g, polyoxyethylene polyoxypropylene ether block copolymer 3g, thickener aluminum magnesium silicate 1g, xanthan gum 0.1g, 2g film-forming agent polyethylene glycol, 2g antifreeze urea, and 30g pyraclostrobin (100%), add water to 100g, use zirconium beads as medium, medium coefficient is 1, sand for 2.5h, sand The grinding temperature was controlled below 45° C. to prepare a 30% pyrafenox suspension, and the preparation process and the number of air bubbles in the product were observed.

Table 8 Screening results of the types and dosages of defoaming agents of pyraclostrofen suspension for seed coating

The screening results of the type and dosage of defoamer show that: when the dosage of isooctanol is 1.0% to 2.5%, there are less bubbles in the preparation process and product (Table 8). Among them, when the amount of isooctyl alcohol is 1.5%, there are no obvious bubbles in the preparation process and the product, and the amount is small and the cost is low, which is the preferred solution of the present invention. Therefore, the next step test is carried out with 1.5% isooctanol as the defoaming agent. .

Example 4 The preparation method of 30% diflufenapyr suspension seed coating

The 30% diflufenapyr suspension seed coating described in Example 1 is prepared by the following method:

Pass various solid components through a 320-mesh sieve, and sieve the pyrazole hydrochloride, alkylphenol formaldehyde resin polyoxyethylene ether, NNO, polyoxyethylene polyoxypropylene ether block copolymer, aluminum magnesium silicate, xanthogen Glue, polyethylene glycol, urea, isooctanol, rose essence, isothiazolinone, and deionized water are added to the sand mill in proportion, and pre-dispersed at high speed for 30 minutes, and then add sand grinding medium zirconium beads (media coefficient is 1) , Sanding for 2.5h, the sanding temperature is controlled below 45 ℃, and the sanding medium and impurities are removed by filtration.

Effect Verification 2 Quality Inspection of 30% Mezafenapyr Suspended Seed Coating Agent

Five batches of samples were prepared according to the formulation of 30% diflufenapyr suspension seed coating described in Example 1.

The quality index of 30% pyraclostrobin suspended seed coating refers to NY 621-2002, specifically:

1. Appearance: It should be a flowable and uniform suspension, there may be a small amount of precipitation or stratification in long-term storage, but it should be able to restore to its original state when shaken by hand at room temperature, and there should be no agglomeration;

2. The content of active ingredients ≥ the indicated content;

3. pH value: 5.0～7.0;

4. Suspension rate ≥ 90%;

5. Sieve analysis (passing 44μm test sieve) ≥ 99%;

6. Viscosity range (25℃): 100～600mPa·s;

7. Film formation: qualified;

8. Coating uniformity ≥90%;

9. The coating shedding rate is less than or equal to 8%;

10. Low temperature stability: qualified;

11. Thermal storage stability: qualified.

The content of active ingredients was determined by high performance liquid chromatography, Hypersil C18 chromatographic column, injection volume 5.0 μL; column temperature 35 °C; mobile phase: V (acetonitrile): V (water) = 25:75, flow rate 1.0 mL/min; Filtered through a filter membrane with a pore size of 0.45 μm, and ultrasonically degassed in an ultrasonic bath for 15 minutes; the detection wavelength was 273 nm; the retention time was about 7.24 minutes. The pH value was measured according to GB/T1601-1993. The sieve analysis was carried out in accordance with GB/T 16150-1995. Suspension rate, viscosity range, film-forming property, coating uniformity, coating shedding rate, low temperature stability, and thermal storage stability were measured in accordance with NY 621-2002.

The quality inspection results of the 30% pyrimethacrylate suspended seed coating showed that all the quality inspection results of the 5 batches of samples were qualified, indicating that the formula and preparation method were feasible (Table 9).

Table 9 Quality test results of 30% pyraclostrofen suspension seed coating

Effect verification 3. Determination of the safety of 30% mezafen-prop-prop-prop suspension seed coating on seeds

47.1g/hm ² of difenapyr has a good effect. Therefore, taking 47.1g/hm ² as the normal dosage, the tests were carried out according to 1, 2, 4, 6, 8, and 10 times of the normal dosage, respectively. Seed treatment to clarify the safety of seeds. After diluting the prepared 30% diflufenapyr suspension seed coating agent in proportion, the seeds of wheat (variety: Jimai 22) were packaged according to the dosage of 47.1, 94.2, 188.4, 282.6, 376.8 and 471.0 ^g /hm2 respectively. The ratio of coating to drug species (the quality of the seed coating agent liquid: the quality of the seeds) was 1:50, and the water treatment was used as the control.

Determination of the effect of 30% pyriflufen-ethyl suspended seed coating agent on the indoor germination potential and indoor germination rate of seeds by indoor test: Arrange the seeds equidistantly on the moistened filter paper, cultivate in a constant temperature incubator at 20 °C, and observe every day. The germination situation and timely supplement of water were counted and calculated on the 4th day, and the indoor germination rate was measured on the 12th day. Set 4 repetitions, each with 50 capsules.

The effect of 30% pyrazin suspension seed coating on seed germination rate was determined by field test: artificially ditch sowing after field preparation, investigate the number of seedlings 7d and 15d after sowing, and calculate the germination rate. Set 4 repetitions, each with 200 capsules.

Table 10 The safety of 30% pyrazin-flu-fen suspension seed coating on wheat seeds

The results of 30% pyraclostrobin suspended seed coating on seeds showed that the treatment of 10 times the normal dosage had certain phytotoxicity to wheat and could reduce the germination potential and germination rate of wheat; Safety. It is shown that the 30% mezafenapyr suspension seed coating prepared by the present invention is safe for seeds (Table 10).

Example of Indoor Bioassay of Effect Experiment 4

The indoor bioassay examples of the present invention are carried out according to the "Pesticide Indoor Bioassay Test Guidelines for Herbicides Part 4: Activity Determination Test Stem and Leaf Spray Method (NY/T 1155.4-2006)", and through the indoor bioassay, it is clear that 30% pyrazole The application effect of fenpropion suspension seed coating agent. The test method is as follows:

Accurately weigh 2.5263 g of 95% methyldisulfuron-methyl and dissolve it in 25 mL of N,N-dimethylformamide to prepare a methyldisulfuron-methyl mother liquor with a concentration of 96 g/L. Accurately weigh 2.0942 g of the 95.5% diflufenapyr technical drug, dissolve it in 25 mL of acetone, and prepare a diflufenapyr mother solution with a concentration of 80 g/L. During the test, an appropriate amount of the mother liquor of metsulfuron-methyl and the mother liquor of carflufenacil were respectively diluted with an appropriate amount of 0.1% aqueous solution of Tween 80 to prepare the test spray liquid.

The pot experiment method was adopted, and the test targets were winter wheat (variety: Jimai 22), Jiejiemai, wild oats, and Artemisia somnifera. In the solar greenhouse, choose plastic pots with a diameter of 12 cm and a height of 11 cm to raise seedlings, set the seedlings before spraying, and keep 10 uniform plants in each pot. The test wheat and weeds were sprayed with the herbicide mesulfuron-methyl or the mixture of mesulfuron-ethyl and pyraclostrofen at the 2-3 leaf stage of the tested wheat and weeds. Each treatment was repeated 4 times, and the liquid volume was 450L/ hm ² . Seed coating treatment, before sowing, after diluting 30% pyraclostrofen suspension seed coating agent in proportion, coat the wheat seeds according to the ratio of drug to seed (quality of seed coating agent liquid: seed quality) 1:50 before sowing . 14 days after the treatment, the fresh weight of each pot was weighed, and the control effect of each treatment on weeds or the phytotoxicity rate E to wheat was calculated:

In the formula: E——the control effect on weeds or the phytotoxicity rate on wheat

T——the fresh weight of the wheat or weeds in the chemical treatment group;

C—the fresh weight of part of the wheat or weeds in the blank control group.

The results of the bioassay test are shown in Table 11. The results showed that when the dosage of metsulfuron-methyl was ^15.7g /hm ² , the phytotoxicity rate to wheat was 27.84% without the use of pyriflufen-ethyl. The phytotoxicity rate was -0.20%; the dosage of metsulfuron-methyl was 11.2g/hm ² , the phytotoxicity rate to wheat was 19.35% without the use of diflufenapyr, and the cyclofenapyr 47.1g/hm ² seed treatment Afterwards, the phytotoxicity rate to wheat was -0.15%, which indicated that pyraclostrofen had seed treatment activity under indoor conditions.

The dosage of metsulfuron-methyl was 15.7g/hm ² , and after coating treatment with 30% pyrazol-but-fen-propoxylate suspension seed coating, the control effect on J. , the phytotoxicity rate to wheat was -0.20%, and the control effect to wild oat was 94.08%; The control effect on Artemisia somnifera was 76.66%, the phytotoxicity rate on wheat was 6.81%, and the control effect on wild oats was 93.15%. It is shown that the use of the 30% pyrazin suspension seed coating agent provided by the present invention for seed treatment can significantly improve the control effect of methyldisulfuron on A. The control efficacy of wild oats was not affected.

In addition, when pyraclostrobin was not used, the control effect on A. japonicus was 98.05%, the control effect on Artemisia annua was 85.43%, the phytotoxicity rate on wheat was 27.84%, and the control effect on wild oat was 92.92%. %, indicating that in order to ensure the safety of crops, mesulfuron-methyl must be used in combination with mefenox-ethyl, but the prior art mixed spraying of mesulfuron-ethyl and mesulfuron-ethyl can significantly reduce the effect of herbicides on weeds. The control effect of the herbicide is not affected by the use of the 30% pyriflufen-ethyl suspension seed coating provided by the present invention for seed treatment.

The dosage of metsulfuron-methyl was 11.2 g/hm ² , and after coating treatment with 30% pyraclostrofen suspension seed coating agent, the control effect on J. , the phytotoxicity rate to wheat was -0.15%, and the control effect to wild oat was 83.25%; The control effect on Artemisia somnifera was 56.67%, the phytotoxicity rate on wheat was 5.16%, and the control effect on wild oats was 81.74%. It is shown that the use of the 30% pyrazin suspension seed coating agent provided by the present invention for seed treatment can significantly improve the control effect of methyldisulfuron on A. The control efficacy of wild oats was not affected. In addition, when pyraclostrobin was not used, the control effect of fenugreek was 93.47%, the control effect of Artemisia annua was 84.30%, the phytotoxicity rate of wheat was 19.35%, and the control effect of wild oat was 81.43%. %, indicating that in order to ensure the safety of crops, mesulfuron-methyl must be used in combination with mefenox-ethyl, but the prior art mixed spraying of mesulfuron-ethyl and mesulfuron-ethyl can significantly reduce the effect of herbicides on weeds. The control effect of the herbicide is not affected by the use of the 30% pyriflufen-ethyl suspension seed coating provided by the present invention for seed treatment.

The 30% pyrazin suspension seed coating provided by the present invention is used for seed treatment and then sprayed with metsulfuron-methyl at a dosage of 11.2 g/hm ² . The effect is 85.39%; the dosage of metsulfuron-methyl in the prior art is 15.7g/hm ² , the control effect on Jiejie is 90.48%, and the control effect on Artemisia spp. After the seed treatment with mezafenpyr suspension seed coating, the application of metsulfuron-methyl can significantly reduce the dosage of herbicides and improve the control effect of herbicides on weeds.

The 30% mezafenib suspended seed coating agent provided by the present invention is used for seed treatment and then sprayed with methyldisulfuron, the dosage is 15.7g/hm ² , and the phytotoxicity rate to wheat is -0.20%; The dosage of Sulfuron-methyl is 11.2g/hm ² , and the phytotoxicity rate to wheat is 5.16%; it shows that the 30% pyrazin suspension seed coating provided by the present invention can significantly improve the safety of the herbicide to crops.

Table 11 Bioassay test results of the effect of 30% pyrazin suspension seed coating on the efficacy and phytotoxicity of herbicides

Note: The dosage of pyraclostrofen seed treatment is 47.1g/hm ² , and the seeding rate is calculated as 187.5kg/hm ² , which is equivalent to 25.12g/100kg seeds, that is, ag/hm ² is equivalent to (a/187.5×100)g/100kg seed.

Effect Verification 5 Field Drug Efficacy Test Example

The field efficacy test example of the present invention is carried out according to "Pesticide Field Efficacy Test Guidelines (1) Herbicide Controlling Weeds in Wheat Crops (GB/T 17980.41-2000)", and the indoor bioassay test is verified through field plot test result. The test method is as follows:

The weeds were treated by spraying on stems and leaves at the 2-3 leaf stage, the liquid volume was 450L/hm ² , each treatment was repeated 4 times, the plot area was 25 m ² , and the cells were randomly arranged in blocks. 30 days after the treatment, 4 sampling points were randomly selected from each plot, each of 1 m ² , and the fresh weights of wheat and each weed were investigated respectively, and the control effect of each treatment on weeds or the phytotoxicity rate E to wheat was calculated:

In the formula: E——the control effect on weeds or the phytotoxicity rate on wheat

PT - fresh weight of wheat or weeds in the chemical treatment area;

CK - fresh weight of wheat or weeds in blank control area.

The test was carried out in Shoushansi Village, Guantao County, Handan City, Hebei Province. The targets for the test were winter wheat (variety: Jimai 22), Jiejie wheat, wild oats, Artemisia somnifera, etc. The treatment methods, the control effects of each treatment on weeds and The phytotoxicity rate to wheat is shown in Table 12.

The results of the field efficacy test showed that: the dosage of metsulfuron-methyl was 15.7g/hm ² , the phytotoxicity rate to wheat was 20.09% without the use of diflufenapyr, and 47.1g/hm ² seeds were treated with diflufenapyr. , the phytotoxicity rate to wheat was 0.88%; the dosage of metsulfuron-methyl was 11.2g/hm ² , the phytotoxicity rate to wheat was 18.28% when pyrafen-methyl was not used, 47.1g/hm After ² seed treatments, the phytotoxicity rate to wheat was 0.24%, which indicated that pyraclostrobin had seed treatment activity under field conditions.

The dosage of metsulfuron-methyl was 15.7g/hm ² , and after coating treatment with 30% pyrazin-flu-methyl suspension seed coating agent, the control effect on J. , the phytotoxicity rate to wheat was 0.88%, and the control effect to wild oats was 91.86%; The control effect of Artemisia somnifera was 71.21%, the phytotoxicity rate to wheat was 7.75%, and the control effect to wild oats was 91.21%. It is shown that the use of the 30% pyrazin suspension seed coating agent provided by the present invention for seed treatment can significantly improve the control effect of methyldisulfuron on A. The control efficacy of wild oats was not affected. In addition, when pyraclostrochloride was not used, the control effect on A. japonicus was 96.62%, the control effect on Artemisia annua was 79.99%, the phytotoxicity rate on wheat was 20.09%, and the control effect on wild oat was 91.99%. %, indicating that in order to ensure the safety of crops, mesulfuron-methyl must be used in combination with mefenox-ethyl, but the prior art mixed spraying of mesulfuron-ethyl and mesulfuron-ethyl can significantly reduce the effect of herbicides on weeds. The control effect of the herbicide is not affected by the use of the 30% pyriflufen-ethyl suspension seed coating provided by the present invention for seed treatment.

The dosage of metsulfuron-methyl was 11.2g/hm ² , and after coating treatment with 30% pyraclostrofen suspension seed coating agent, the control effect on J. , the phytotoxicity rate to wheat was 0.24%, and the control effect to wild oat was 82.20%; The control effect of Artemisia sophorae was 50.38%, the phytotoxicity rate to wheat was 6.56%, and the control effect to wild oats was 80.38%. It is shown that the use of the 30% pyrazin suspension seed coating agent provided by the present invention for seed treatment can significantly improve the control effect of methyldisulfuron on A. The control efficacy of wild oats was not affected. In addition, when pyraclostrobin was not used, the control effect of fenugreek was 91.75%, the control effect of Artemisia annua was 79.26%, the phytotoxicity rate of wheat was 18.28%, and the control effect of wild oat was 81.26%. %, indicating that in order to ensure the safety of crops, mesulfuron-methyl must be used in combination with mefenox-ethyl, but the prior art mixed spraying of mesulfuron-ethyl and mesulfuron-ethyl can significantly reduce the effect of herbicides on weeds. The control effect of the herbicide is not affected by the use of the 30% pyriflufen-ethyl suspension seed coating provided by the present invention for seed treatment.

Using the 30% mezafenpyr suspension seed coating provided by the present invention to carry out seed treatment and then spraying metsulfuron-methyl at an dosage of 11.2 g/hm ² , the control effect on A. The control effect is 80.93%; the dosage of metsulfuron-methyl in the prior art is 15.7g/hm ² , the control effect on Jiejie is 87.55%, and the control effect on Artemisia spp. After the seed treatment with mezafenpyr suspension seed coating, the application of metsulfuron-methyl can significantly reduce the dosage of herbicides and improve the control effect of herbicides on weeds.

The 30% pyrazin suspension seed coating agent provided by the present invention is used for seed treatment and after spraying methyldisulfuron, the dosage is 15.7g/hm ² , and the phytotoxicity rate to wheat is 0.88%; the prior art methyldisulfuron The phytotoxicity rate of wheat was 6.56% with the dosage of 11.2g/hm ² , indicating that the use of the 30% pyraclostrofen suspension seed coating provided by the invention for seed treatment can significantly improve the safety of the herbicide to crops.

Table 12 Field test results of the effects of 30% pyriflufen-ethyl suspension seed coating seed treatment on herbicide efficacy and phytotoxicity

Note: The dosage of pyraclostrofen seed treatment is 47.1g/hm ² , and the seeding rate is calculated as 187.5kg/hm ² , which is equivalent to 25.12g/100kg seeds, that is, ag/hm ² is equivalent to (a/187.5×100)g/100kg seed.

Although the present invention has been described in detail above with general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention fall within the scope of the claimed protection of the present invention.

Claims (18)

1. The mefenpyr-diethyl suspension seed coating agent is characterized by comprising the following components in parts by weight:

10-50 parts of mefenpyr-diethyl,

1-7 parts of a wetting agent,

1-7 parts of a dispersing agent,

0.1 to 3 parts of a thickening agent,

1-3 parts of a film-forming agent,

1-5 parts of an anti-freezing agent,

0.5 to 3 parts of a defoaming agent,

0.1 to 2 parts of a warning agent,

0.5 to 3 parts of a preservative,

the balance of deionized water;

the wetting agent is selected from one or more of alkylphenol formaldehyde resin polyoxyethylene ether, nonylphenol polyoxyethylene ether and castor oil polyoxyethylene ether;

the dispersing agent is selected from one or more of sodium lignosulfonate, NNO, polyoxyethylene polyoxypropylene ether block copolymer, alkylphenol polyoxyethylene phosphate and polyvinylpyrrolidone;

the thickening agent is selected from one or more of magnesium aluminum silicate, xanthan gum, sodium alginate and hydroxyethyl cellulose;

the film forming agent is selected from one or more of polyvinyl alcohol, polyethylene glycol and polyacrylamide;

the antifreezing agent is selected from one or more of ethylene glycol, glycerol and urea;

the defoaming agent is selected from one or more of isooctyl alcohol, isoamyl alcohol, stearic acid and lauric acid;

the warning agent is selected from one or more of acid scarlet, alkaline rose essence and Rudaming 2B;

the preservative is selected from one or more of formaldehyde, sodium salicylate, sodium benzoate, 1, 2-benzothiazolinone-3-one, 2-hydroxybiphenyl, sorbic acid, benzoic acid, benzaldehyde, p-hydroxybenzaldehyde, p-hydroxybenzyl ester and isothiazolinone.

2. The mefenpyr diethyl suspension seed coating agent of claim 1, which is characterized by comprising the following components by weight: 30% of mefenpyr-diethyl, 4% of wetting agent, 5% of dispersing agent, 1.1% of thickening agent, 2% of film forming agent, 2% of antifreezing agent, 1.5% of defoaming agent, 0.5% of warning agent, 1% of preservative and the balance of deionized water.

3. The mefenpyr diethyl suspension seed coating of claim 2, wherein the wetting agent is alkylphenol formaldehyde resin polyoxyethylene ether;

the dispersant is NNO and/or polyoxyethylene polyoxypropylene ether block copolymer;

the thickening agent is magnesium aluminum silicate and/or xanthan gum;

the film forming agent is polyethylene glycol;

the antifreeze is urea;

the antifoaming agent is isooctanol;

the warning agent is alkaline rose essence;

the preservative is isothiazolinone.

4. Use of the mefenpyr-diethyl suspension seed coating agent as claimed in any one of claims 1 to 3 for controlling weeds in wheat fields.

5. The application according to claim 4, wherein the application is: and coating the wheat seeds by using the mefenpyr-diethyl suspension seed coating agent.

6. The use according to claim 4, wherein the weeds in wheat fields are grasses, broadleaf weeds, sedge weeds.

7. The use of claim 6, wherein the weeds in the wheat field are selected from one or more of jiejie, brome, aloesbill, alopecurus, beckia, beckmelon beck, beckmelon, club grass, lolium multiflorum, poison wheat, conyza sativa, aegilops tauschii, descurainia, shepherd's purse, male mallow, hordeum vulgare, chenopodium quinoa, calystegia chinensis, and sedge.

8. The use of claim 7, wherein the weeds in the wheat field are Arthrobacter and/or Aleurites sophia.

9. The use as claimed in claim 4, wherein the mefenpyr-diethyl suspension seed coating agent is used in an amount of 1-2000g of active ingredient per 100kg of seeds.

10. The use as claimed in claim 9, characterized in that the amount of active principle of the mefenpyr-diethyl suspension seed coating agent is 10-1000g per 100kg of seeds.

11. The use as claimed in claim 10, characterized in that the amount of active principle of the mefenpyr-diethyl suspension seed coating agent is 20-500g per 100kg of seeds.

12. The application as claimed in claim 4, wherein the amount of the mefenpyr-diethyl suspension seed coating agent is 1.875-3750g/hm²。

13. The use of claim 12, wherein the mefenpyr-diethyl suspension seed coating agent is used in an amount of 18.75-1875g/hm²。

14. The use as claimed in claim 13, wherein the mefenpyr-diethyl suspension seed coating agent is used in an amount of 37.5-937.5g/hm²。

15. The use as claimed in claim 4, wherein, in a specific application, the mefenpyr-diethyl suspension seed coating agent is used in combination with mesosulfuron-methyl: coating seeds with the mefenpyr-diethyl suspension seed coating agent, and spraying mesosulfuron-methyl.

16. The use as claimed in claim 15, wherein the mefenpyr-diethyl suspension seed coating agent is used in an amount of 1.875 to 3750g/hm²。

17. The use of claim 16, wherein the mefenpyr-diethyl suspension seed coating agent is used in an amount of 18.75-1875g/hm²。

18. Use according to claim 17The method is characterized in that the dosage of the mefenpyr-diethyl suspension seed coating agent is 37.5-937.5g/hm²(ii) a The dosage of the mesosulfuron-methyl is 8-20g/hm²It is preferable.