CN112931526A

CN112931526A - Water dispersible granule containing bifenthrin and fluopicolide as well as preparation method and application thereof

Info

Publication number: CN112931526A
Application number: CN201911262560.3A
Authority: CN
Inventors: 袁良国; 李志清; 王松莹; 王建伟; 孙鹏
Original assignee: Shandong Weifang Rainbow Chemical Co Ltd
Current assignee: Shandong Weifang Rainbow Chemical Co Ltd
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2021-06-11

Abstract

The invention discloses a bifenthrin and fluopicolide-containing water dispersible granule as well as a preparation method and application thereof, and the water dispersible granule comprises the following components in percentage by weight: 15-40% of bifenthrin, 5-20% of fluopicolide, 5-10% of dispersing agent, 2-6% of wetting agent, 5-30% of disintegrating agent and 100% of filler. The bifenthrin and the fluopicolide are compounded and prepared into the water dispersible granules, the water dispersible granules have the advantages of convenience in use, no dust flying, safety, low toxicity and the like, have good control effects on pests such as flea beetles, whiteflies, peach fruit borers, leaf miners, leaf mites, weevils, leaf beetles and the like, and various diseases such as wheat sharp eyespot, rice sheath blight, sclerotinia rot of colza, wheat smut, potato black nevus, corn small leaf spot, corn head smut, soybean rust, soybean powdery mildew, cotton rhizoctonia solani and the like, and have obviously improved insecticidal and disease prevention effects compared with a single agent of bifenthrin and fluopicolide.

Description

Water dispersible granule containing bifenthrin and fluopicolide as well as preparation method and application thereof

Technical Field

The invention relates to a water dispersible granule, in particular to a water dispersible granule containing bifenthrin and fluopicolide, a preparation method and application thereof, and belongs to the technical field of chemical pesticides.

Background

Bifenthrin, english name: bifenthrin, chemical name: methyl biphenyl-3-yl methyl (Z) (1RS,3RS)3- (2-chloro-3, 3, 3-trifluoro propyl-1-alkenyl) -2, 2-dimethyl cyclopropane carboxylic ester, which belongs to pyrethroid insecticides and acaricides. Bifenthrin has the characteristics of strong knock-down effect, broad spectrum, high efficiency, rapidness, long residual effect and the like, mainly has the contact killing effect and the stomach toxicity effect, has no systemic effect, is suitable for various crops such as cotton, fruit trees, vegetables, tea leaves and the like, can be used for preventing and controlling cotton bollworms, red bollworms, tea geometrid, tea caterpillars, red spiders of apples or hawthorns, peach fruit borers, cabbage aphids, cabbage caterpillars, diamondback moths, citrus leaf miners and the like, has quick effect, does not move in soil, is safe to environment and has long residual effect period.

Fluopicolide, english name: fluxapyroxad, chemical name: 3- (difluoromethyl) -1-methyl-N- (3 ', 4 ', 5 ' -trifluoro [1, 1-biphenyl ] -2-yl)) -1H-pyrazole-4-formamide is a broad-spectrum pyrazole formamide bactericide and has protection and treatment effects. The treated seeds can absorb fluopicolide in the germination process and are conducted to other parts of plants through xylem, so that the effect of protecting crops is achieved. Fluopyram has good treatment and protection effects on other fungal infection diseases such as blight and the like, has high biological activity on oomycete pathogenic bacteria, has strong permeability, can protect leaves from being infected by plant pathogenic bacteria after treatment of sprouts, can provide comprehensive and durable protection for new leaves, stems and young fruits, and has good prevention, control and treatment effects on diseases such as potato black nevus, wheat sharp eyespot, rice sheath blight, sclerotinia rot of colza, wheat loose smut, wheat stinking smut, corn small leaf spot, corn head smut and the like caused by rhizoctonia solani, smut and the like.

At present, bifenthrin preparation mainly takes missible oil as main material, fluopicolide preparation also takes missible oil and suspending agent as main material, a great amount of organic solvent is used in missible oil, the problems of environmental pollution and transportation safety exist, water dispersible granules have requirements on packaging materials and the like, and the bifenthrin preparation is an environment-friendly preparation formulation for reducing the personal safety and environmental pollution during use. In addition, the two have the functions of killing insects and bacteria respectively, and farmers need to apply pesticide respectively when controlling pests and diseases when planting crops, so that the labor cost and the use cost are increased. If the two are processed into a mixed agent, the pesticide composition can be used for preventing and treating insect pests and diseases at one time, thereby increasing the use convenience and reducing the cost. At present, no report related to bifenthrin and fluopicolide water dispersible granules is found.

Disclosure of Invention

In order to meet the actual requirements of agricultural production, the invention provides a bifenthrin and fluopicolide-containing water dispersible granule, which takes the compounded bifenthrin and fluopicolide as effective components and can kill pests and diseases, and in addition, the selection of various auxiliary agents solves the defects that the effective components of the drug are not easy to disperse, the stability is poor and the like when the water dispersible granule is used.

According to the invention, bifenthrin and fluopicolide are prepared into water dispersible granules, so that the bifenthrin and fluopicolide can realize high content, the use of the preparation amount can be reduced, and the defects of high pollution of missible oil preparations and strict requirements on preparation packaging materials are avoided; and the bifenthrin and the fluopicolide are compounded to play a synergistic effect of killing both diseases and pests, so that the use is more convenient. However, in research, the melting point of bifenthrin is 68-70.6 ℃, the oil-water distribution coefficient logP 6.66, the melting point of fluopicolide is 156.8 ℃, and the oil-water distribution coefficient logP 3.08 are found, the lipophilicity of the two raw materials is strong, and particularly, bifenthrin is not easy to disperse in water, and because the melting point is low, unsmooth granulation, stickiness and granulation are easy to occur in the processing process, dead particles which cannot be dispersed are easy to occur when heated, the heat storage stability is poor, and the problems that the content of effective components is higher are more prominent. Aiming at the problems, the inventor carries out a large amount of screening work on an auxiliary agent system (auxiliary agent type, auxiliary agent components and auxiliary agent content) through research and a large amount of experiments, and finally obtains the auxiliary agent system with good matching degree, stable performance and good insecticidal and bactericidal effects. Through the selection of the auxiliary agents, particularly the screening and combination of 2 auxiliary agents, namely a dispersing agent and a wetting agent, the dispersibility of effective components in water in the water dispersible granule is improved, the stability of the preparation is improved, the processing difficulty of the preparation form is greatly reduced, the bifenthrin and fluopicolide can realize lower content and high content of 50-60 percent when the bifenthrin and fluopicolide are prepared into the water dispersible granule, and the finally obtained water dispersible granule has the advantages of high suspension rate, good dispersibility, high disintegration speed, good heat storage stability and the like.

The specific technical scheme of the invention is as follows:

a water dispersible granule containing bifenthrin and fluopicolide comprises the following components in percentage by weight: 15-40% of bifenthrin, 5-20% of fluopicolide, 5-10% of dispersing agent, 2-6% of wetting agent, 5-30% of disintegrating agent and 100% of filler. Wherein, the dispersant has the function of preventing the fine particles of the active ingredients of the medicine from mutually aggregating, so that the active ingredients of the medicine can be uniformly dispersed for a long time in a liquid-solid dispersion system formed by the active ingredients and water. The wetting agent is used for reducing the liquid-solid surface tension of the fine particles in water and increasing the capacity of being wetted by water, and the disintegrating agent is used for enabling water to rapidly enter the particles, accelerating the disintegration of the particles and improving the dispersion speed of the effective components in water. The filler is used for loading or diluting the active ingredients of the medicine and adjusting the content of the product to reach the standard.

Further, the water dispersible granule comprises the following components in percentage by weight: 15-40% of bifenthrin, 5-20% of fluopicolide, 6-8% of dispersing agent, 2-4% of wetting agent, 15-25% of disintegrating agent and 100% of filler.

Furthermore, in the water dispersible granule, the total content of bifenthrin and fluopicolide in the water dispersible granule is 20-60wt%, preferably 25-60 wt%, more preferably 30-60 wt%, and more preferably 30-50 wt%.

Furthermore, in the water dispersible granule, the mass ratio of bifenthrin to fluopicolide is 2-6:1, and preferably 3: 1.

Preferably, in the water dispersible granules, the content of bifenthrin in the water dispersible granules is 30wt%, and the content of fluopicolide in the water dispersible granules is 10 wt%.

Preferably, in the water dispersible granule, the weight percentage of each component is as follows: 30% of bifenthrin, 10% of fluopicolide, 8% of dispersing agent, 3% of wetting agent, 20% of disintegrating agent and 100% of filler.

Further, in the water dispersible granule, the dispersant is one or more of sodium lignosulfonate, maleic acid-acrylic acid copolymer salt, polyoxyethylene-polyoxypropylene block copolymer, sodium alkyl phenol sulfonate, sodium alkyl naphthalene sulfonate-formaldehyde condensate, sodium alkyl polyoxyethylene ether sulfate, ethylene oxide-propylene oxide block copolymer and sodium polycarboxylate. When the dispersing agent is a mixture of sodium polycarboxylate and sodium lignosulfonate in a mass ratio of 1:1-3, the water dispersible granules have the best dispersing performance, active ingredients of the medicaments do not have agglomeration and precipitation phenomena, the dispersibility is good, the suspension rate is high, and the uniform dispersion of the active ingredients in water is facilitated. The sodium polycarboxylate used in the invention can be sodium polyacrylate, and the sodium polycarboxylate has similar performance.

Furthermore, in the water dispersible granule, the wetting agent is one or more of sodium dodecyl sulfate, a-sulfo fatty acid methyl ester, sodium tetradecyl sulfate, sodium dodecyl benzene sulfonate, sodium alkyl naphthalene sulfonate, sodium a-olefin sulfonate, sodium alkylphenol polyoxyethylene ether sulfate, nekal BX, fatty acid sulfate and fatty acid ester sulfate. The fatty acid ester sulfate may be fatty acid methyl ester sulfate, fatty acid ethyl ester sulfate, etc. When the wetting agent is a mixture of nekal BX and alkylphenol polyoxyethylene ether sodium sulfate with the mass ratio of 1:1-1.5, the wetting property is optimal, the active ingredients of the medicine are disintegrated quickly, the suspension rate is high, the surface tension of the liquid medicine is reduced, the wetting and spreading on the surface of a target are easier, and the purposes of killing insects and sterilizing can be better achieved.

Further, in the water dispersible granule, the disintegrating agent is one or more of potassium sulfate, potassium chloride, diammonium phosphate, urea, sodium sulfate, ammonium sulfate and sodium chloride, and preferably the disintegrating agent is a mixture of sodium sulfate and ammonium sulfate in a mass ratio of 1: 1-1.5.

Further, in the water dispersible granule, the filler is one or more of kaolin, diatomite, bentonite, talcum powder, attapulgite, corn starch and light calcium carbonate, and the preferable filler is a mixture of the talcum powder and the kaolin in a mass ratio of 1: 1-2.

The water dispersible granule is simple to prepare and easy to implement, and has the advantages of high suspension rate, good dispersibility, good stability and the like through selection of various auxiliaries. The water dispersible granule can be prepared by the following method: uniformly mixing bifenthrin, fluopyram, a dispersing agent, a wetting agent, a disintegrating agent and a filler in a mixer, crushing the mixture into particles with the particle size of 20-30 mu m by a jet mill, mixing the particles again, adding water, kneading, extruding, granulating and drying to obtain the bifenthrin-fluopyram-containing water-based composite material.

Furthermore, in the preparation method, the adding amount of water is 5-20% of the total mass of all materials.

Further, in the preparation method, the drying temperature is 45-50 ℃.

Furthermore, compared with single agents of bifenthrin and fluopicolide, the water dispersible granule has more prominent double-killing effect on diseases and pests, and has good application prospect in the field of crop pest control. The water dispersible granule can be widely used for crops such as wheat, rice, corn, peanut, soybean, rape, potato, cotton or fruit trees, but is not only suitable for the above-listed crops, but also suitable for other crops. The composition has good control effect on soil insects and soil-borne diseases of the crops, such as flea beetles, whiteflies, peach fruit borers, leaf miners, leaf mites, weevils, leaf beetles and the like of the crops, and various diseases of the crops, such as wheat sharp eyespot, rice sheath blight, sclerotinia rot of colza, wheat smut, potato black nevus, small leaf spot of corn, head smut of corn, rust disease of soybean, powdery mildew of soybean, cotton rhizoctonia rot and the like. The invention has the following beneficial effects:

1. according to the invention, bifenthrin and fluopicolide are compounded and prepared into the water dispersible granules, the compatibility, water dispersibility and stability of bifenthrin and fluopicolide are improved through the selection of an auxiliary agent system, and the water dispersible granules have the advantages of uniform dispersion, high suspension rate, high disintegration speed, good stability, convenience in use, no dust flying, safety, environmental protection, low toxicity and the like, and particularly have good dispersibility and stability when the medicine content is high.

2. The bifenthrin and the fluopicolide of the water dispersible granule have good synergistic effect, the compatibility of the bifenthrin and the fluopicolide is good, the bifenthrin and the fluopicolide are not contradicted when being mixed, the double-killing effect of diseases and pests can be achieved after one-time application, the water dispersible granule can be widely used for crops such as wheat, rice, corn, peanut, soybean, rape, potato, cotton or fruit trees, and the like, and can be used for preventing and controlling pests such as flea beetle, whitefly, carposina niponensis walsingham, leaf miner, leaf mite, aleyrodids, weevil, leaf beetle and the like of the crops, and various diseases such as wheat sharp eyespot, corn leaf blight, rape sclerotinia rot, wheat smut, potato black nevus, corn small leaf spot, corn smut, soybean rust, soybean powdery mildew, cotton blight and the like of the crops, and the disease preventing and insect killing effect is obviously improved compared with bifenth.

Detailed Description

The technical solution of the present invention is further illustrated below with reference to specific examples, but the essence of the present invention is not limited to the following examples, which should not be construed as limiting the scope of the present invention. Unless otherwise specified, the following components are contained in weight percentage.

Example 120% Biphenthrin Fluopyram Water Dispersion granules

The formula is as follows: 15% of bifenthrin, 5% of fluopyram, 4% of dispersant sodium polyacrylate, 4% of sodium lignosulfonate, 1.5% of wetting agent nekal BX, 1.5% of alkylphenol polyoxyethylene ether sodium sulfate, 10% of disintegrant sodium sulfate, 10% of ammonium sulfate, and the filler is prepared by mixing talcum powder and kaolin according to the mass ratio of 1:1 and adding the mixture to 100%.

The preparation method comprises the following steps: mixing the raw medicine, dispersant, wetting agent, disintegrating agent and filler in a mixer, pulverizing to particle size of 20-40 μm by jet mill, kneading with water amount of 20wt% of the material, granulating by extrusion, and oven drying at 40-50 deg.C.

Example 235% bifenthrin-Fluopyrafen aqueous Dispersion granule

The formula is as follows: 30% of bifenthrin, 5.0% of fluopyram, 2.5% of dispersant sodium polyacrylate, 5.5% of sodium lignosulfonate, 1.5% of wetting agent nekal BX, 1.5% of alkylphenol polyoxyethylene ether sodium sulfate, 10% of disintegrant sodium sulfate and 10% of ammonium sulfate, wherein the filler is formed by mixing talcum powder and kaolin according to the mass ratio of 1:1 until the mixture reaches 100%. The preparation method is the same as example 1.

Example 340% Biphenthrin Fluopyram Water Dispersion granules

The formula is as follows: 30% of bifenthrin, 10% of fluopyram, 2% of sodium polyacrylate salt as a dispersant, 6% of sodium lignosulfonate, 1.5% of nekal BX as a wetting agent, 1.5% of sodium alkylphenol polyoxyethylene ether sulfate, 10% of sodium sulfate as a disintegrant, 10% of ammonium sulfate and the filler are added to 100% by the mass ratio of 1:1.5 between talcum powder and kaolin. The preparation method is the same as example 1.

Example 450% Biphenthrin Fluopyram Water Dispersion granules

The formula is as follows: 40% of bifenthrin, 10% of fluopyram, 2% of sodium polyacrylate salt as a dispersant, 6% of sodium lignosulfonate, 1.0% of nekal BX as a wetting agent, 1.5% of sodium alkylphenol polyoxyethylene ether sulfate, 8% of sodium sulfate as a disintegrant, 12% of ammonium sulfate and the filler are added to 100% by the mass ratio of 1:2 of talcum powder to kaolin. The preparation method is the same as example 1.

Example 560% bifenthrin-Fluopyrafen aqueous Dispersion granule

The formula is as follows: 40% of bifenthrin, 20% of fluopyram, 2% of sodium polyacrylate salt as a dispersing agent, 6% of sodium lignosulfonate, 1% of sodium dodecyl sulfate as a wetting agent, 2.0% of sodium alkylphenol polyoxyethylene ether sulfate, 10% of sodium sulfate as a disintegrating agent, 12% of ammonium sulfate and 100% of a filler by adding talcum powder and kaolin according to the mass ratio of 1: 2. The preparation method is the same as example 1.

Example 620% Biphenthrin Fluopyram Water Dispersion granules

The formula is as follows: 15% of bifenthrin, 5% of fluopyram, 2.5% of dispersant polyacrylic acid sodium salt, 2.5% of naphthalenesulfonic acid formaldehyde condensate sodium salt, 1% of wetting agent sodium dodecyl sulfate, 1% of fatty acid ester sodium sulfate salt, 5% of disintegrant ammonium sulfate and 100% of filler talcum powder. The preparation method is the same as example 1.

Example 735% Biphenthrin Fluopyram Water Dispersion granules

The formula is as follows: 30.0% of bifenthrin, 5.0% of fluopicolide, 6% of dispersant maleic acid-acrylic acid copolymer salt, 3.0% of wetting agent nekal BX, 5% of disintegrant sodium sulfate, 10% of ammonium sulfate and 100% of filler corn starch. The preparation method is the same as example 1.

Example 840% bifenthrin-fluopicolide aqueous Dispersion granules

The formula is as follows: 30% of bifenthrin, 10% of fluopyram, 5% of dispersant sodium polycarboxylate, 3% of ethylene oxide-propylene oxide block copolymer, 2% of wetting agent sodium tetradecyl sulfate, 2% of alpha-olefin sodium sulfonate, 10% of disintegrant calcium chloride, 10% of sodium chloride and 100% of filler light calcium carbonate. The preparation method is the same as example 1.

Example 950% bifenthrin-Fluopyrafen aqueous Dispersion granule

The formula is as follows: 40% of bifenthrin, 10% of fluopyram, 4% of sodium alkylphenol sulfonate serving as a dispersant, 4% of maleic acid-acrylic acid copolymer salt, 2.5% of sodium dodecyl sulfate serving as a wetting agent, 2.5% of alpha-sulfo fatty acid methyl ester, 15% of potassium sulfate serving as a disintegrant, 10% of urea, 5% of sodium hydroxymethyl cellulose and 100% of bentonite serving as a filler. The preparation method is the same as example 1.

Example 1060% Biphenthrin Fluopyram Water Dispersion granules

The formula is as follows: 40% of bifenthrin, 20% of fluopyram, 6% of sodium alkyl phenol sulfonate serving as a dispersant, 4% of polyoxyethylene-polyoxypropylene block copolymer, 3% of sodium dodecyl sulfate serving as a wetting agent, 15% of sodium chloride serving as a disintegrating agent, 15% of sodium carboxymethylcellulose and 100% of kaolin serving as a filler. The preparation method is the same as example 1.

Comparative example 1

The formula is as follows: pesticide active ingredients of 30 percent of bifenthrin and 10 percent of fluopyram; the dispersant is 4 percent of dioctyl sodium sulfosuccinate and 4 percent of styrene acrylic copolymer; wetting agent lauryl alcohol ether sodium sulfate 2%, lauryl sodium sulfate 1%, disintegrating agent anhydrous sodium sulfate 20%, and pottery clay added to 100%. The preparation method is the same as example 1.

The quality stability of the bifenthrin-fluopicolide water dispersible granules prepared in the above examples and comparative examples is tested, and the results are shown in the following table 1. Wherein the fineness of the water dispersible granule is detected by CIPAC MT185, the suspension percentage is detected by CIPAC MT15.1, and the heat storage stability is detected by CIPAC MT 46.1. The disintegration adopts a 100mL measuring cylinder, 2g of sample is added, the sample is turned upside down around the center of the measuring cylinder at the speed of once per second until the granules are completely disintegrated, the disintegration is qualified within 70s, and the disintegration is excellent within 60 s.

As can be seen from the data in the table above, the suspension percentage and the suspension percentage after heat storage of the products in each example are both above 84%, the fineness is above 99.5%, the products are qualified, the products have the characteristics of high suspension percentage, good dispersibility, good stability and the like, and the quality after heat storage is kept stable. The products of examples 1 to 5 were superior in performance, good in thermal storage stability, and the product of example 3 was optimal in performance. The product of the comparative example has poor stability and low suspension rate and can not meet the requirement.

From examples 1-5, in the case of selecting the preferred adjuvant system (adjuvant component and adjuvant content), the performance of the obtained water dispersible granule product varies when the content of the effective pharmaceutical ingredient varies within the range of 20-60%, which indicates that the content of the drug has some influence on the dosage form performance. As can be seen from examples 6-10, in the case of the common additives, the performance of the obtained water dispersible granule is relatively reduced, and the replacement additives have no obvious effect improvement, which shows that the components and the content of the preferred additives have obvious effect of improving the performance of the water dispersible granule, and the common additives do not exist.

Bifenthrin-fluopyram water dispersion granule field drug effect test determination

Test material

The soybean variety to be tested is Jilin No. 20.

The test agent is bifenthrin-fluopicolide water dispersible granules obtained in examples 1-10 and comparative example 1. The control agents were bifenthrin 40% EC (commercially available) and fluopicolide 296.4 g/L SC (commercially available).

Test method

When the pesticide is applied, rust disease spots are first seen at the early stage of the soybean seedling stage and the flourishing white whitefly. And selecting 14 soybean fields for testing, wherein one soybean field is selected as a blank control area, the control area is clear water spray and is not sprayed with the medicament, and the other soybean fields are medicament treatment areas and are sprayed with different preparations. The application method comprises the following steps: the preparation dosage per hectare is mixed with 100kg of water to prepare the liquid medicine, and the liquid medicine is evenly sprayed according to the conversion of the liquid medicine amount in the residential area. The weather is good during the test period, and the daily average temperature is 20-26.0 ℃. No rain is produced on the day of application, and no rain is produced 15 days after application.

Investigation method

Whitefly: investigating population base before applying pesticide, investigating live insect quantity in 3 rd, 7 th and 14 th days after pesticide application, calculating, correcting and preventing effect, and observing the safety of the test pesticide on crops.

Rust disease: 20 plants were sampled and investigated at 5 points per plot by the control line method, 4 leaves were investigated for each plant, and the total leaf number and the number of diseased leaves at each stage were recorded.

The grading method comprises the following steps:

level 0: no disease;

level 1: the area of the lesion spots accounts for less than 5% of the area of the whole leaf;

and 3, level: the area of the lesion spots accounts for 6 to 25 percent of the area of the whole leaf;

and 5, stage: the area of the lesion spots accounts for 26-50% of the area of the whole leaf;

and 7, stage: the area of the lesion spots accounts for 51-75% of the area of the whole leaf;

and 9, stage: the area of the lesion spots accounts for more than 75 percent of the area of the whole leaf;

investigation time and number of times:

the disease condition base is investigated before the application of the medicine, and the prevention and treatment effect is investigated 7d after the application of the medicine.

Drug effect calculation method

In the experimental process, the product of the invention has no adverse effect on soybean in the range of experimental drug application.

The control results for trialeurodes vaporariorum in soybean field are shown in table 2:

as can be seen from the table 2, the bifenthrin and flufen-sodium water dispersible granules can effectively prevent and treat the soybean trialeurodes vaporariorum, and the prevention and treatment effects are superior to those of a comparative example and a control medicament. The control effect of the embodiment 1-5 using the preferable auxiliary agent and the preferable proportion is better than that of other embodiments, and the control effect on the soybean trialeurodes vaporariorum after 14 days is more than 88%.

The control results of soybean field rust are shown in table 3:

as can be seen from the table 3, the bifenthrin and fluopicolide water dispersible granules can effectively prevent and treat soybean rust, have better prevention and treatment effects than comparative examples and control agents, and have no adverse effect on target crops in the application range of experiments. The control effect of the examples 1-5 using the preferred auxiliary agent is better than that of other examples, and the control effect on soybean rust is more than 85%.

The above is a detailed description of the technical solutions of the present invention, and it should be understood that the above-described specific embodiments are only for explaining the present invention, and are not intended to limit the present invention. Obvious variations or modifications which are within the spirit of the invention are possible within the scope of the invention.

Claims

1. A water dispersible granule containing bifenthrin and fluopicolide is characterized in that: the composition comprises the following components in percentage by weight: 15-40% of bifenthrin, 5-20% of fluopicolide, 5-10% of dispersing agent, 2-6% of wetting agent, 5-30% of disintegrating agent and 100% of filler.

2. Water dispersible granules according to claim 1, characterized in that: the composition comprises the following components in percentage by weight: 15-40% of bifenthrin, 5-20% of fluopicolide, 6-8% of dispersing agent, 2-4% of wetting agent, 15-25% of disintegrating agent and 100% of filler.

3. Water dispersible granules according to claim 1 or 2, characterized in that: the total content of bifenthrin and fluopicolide in the water dispersible granules is 20-60wt%, preferably 25-60 wt%, more preferably 30-60 wt%, and more preferably 30-50 wt%.

4. Water dispersible granules according to claim 1 or 2, characterized in that: the mass ratio of bifenthrin to fluopicolide is 2-6:1, and preferably 3: 1.

5. Water dispersible granules according to claim 1 or 2, characterized in that: the content of bifenthrin in the water dispersible granules is 30wt%, and the content of fluopicolide in the water dispersible granules is 10 wt%.

6. The water dispersible granule according to claim 1, which is characterized by consisting of the following components in percentage by weight: 30% of bifenthrin, 10% of fluopicolide, 8% of dispersing agent, 3% of wetting agent, 20% of disintegrating agent and 100% of filler.

7. Water dispersible granules according to any one of claims 1 to 6, characterized in that: the dispersing agent is one or more of sodium lignosulfonate, maleic acid-acrylic acid copolymer salt, polyoxyethylene-polyoxypropylene block copolymer, sodium alkyl phenol sulfonate, sodium alkyl naphthalene sulfonate formaldehyde condensate, sodium alkyl polyoxyethylene ether sulfate, ethylene oxide-propylene oxide block copolymer and sodium polycarboxylate; the wetting agent is one or more of sodium dodecyl sulfate, a-sulfo fatty acid methyl ester, sodium tetradecyl sulfate, sodium dodecyl benzene sulfonate, sodium alkyl naphthalene sulfonate, a-olefin sodium sulfonate, sodium alkylphenol polyoxyethylene ether sulfate, nekal BX, fatty acid sulfate and fatty acid ester sulfate; the disintegrating agent is one or more of potassium sulfate, potassium chloride, diammonium hydrogen phosphate, urea, sodium sulfate, ammonium sulfate and sodium chloride; the filler is one or more of kaolin, diatomite, bentonite, talcum powder, attapulgite, corn starch and light calcium carbonate.

8. Water dispersible granules according to claim 7, characterized in that: the dispersing agent is a mixture of sodium polycarboxylate and sodium lignosulphonate in a mass ratio of 1:1-3, the wetting agent is a mixture of nekal BX and sodium alkylphenol polyoxyethylene ether sulfate in a mass ratio of 1:1-1.5, the disintegrating agent is a mixture of sodium sulfate and ammonium sulfate in a mass ratio of 1:1-1.5, and the filler is a mixture of talcum powder and kaolin in a mass ratio of 1: 1-2.

9. The preparation method of the bifenthrin and fluopicolide-containing water dispersible granules as claimed in any one of claims 1 to 8, is characterized by comprising the following steps: uniformly mixing bifenthrin, fluopicolide, a dispersing agent, a wetting agent, a disintegrating agent and a filler in a mixer, crushing the mixture into particles with the particle size of 20-30 mu m by a jet mill, mixing the particles again, adding water, kneading, extruding, granulating and drying to obtain the water dispersible granule containing bifenthrin and fluopicolide.

10. Use of the bifenthrin and fluopicolide-containing water dispersible granules as claimed in any one of claims 1 to 8 for controlling crop pests; preferably, the crop comprises wheat, rice, corn, peanut, soybean, rape, potato, cotton or fruit trees; preferably, the insect pests comprise flea beetles, whiteflies, peach fruit borers, leaf miners, spider mites, weevils and leaf beetles; preferably, the diseases comprise wheat sharp eyespot, rice sharp eyespot, sclerotinia rot of colza, wheat smut, potato black nevus, corn small spot, corn head smut, soybean rust, soybean powdery mildew and cotton rhizoctonia rot.