Sulfiflumin-containing acaricidal composition and application thereof

Abstract

The invention belongs to the technical field of pesticide mite killing, and discloses a sulfiflumin-containing mite killing composition and application thereof, the mite killing composition comprises an active component A and an active component B, the active component A is sulfiflumin, the active component B is any one of clofentezine, flutenzine, hexythiazox and propargite, and the mass ratio of the active component A to the active component B is 1: 52-56: 1. The acaricidal composition disclosed by the invention has a remarkable control effect on citrus red mites, the harm of harmful mites to plants is reduced, and the development of drug resistance of the harmful mites is slowed down.

Description

[0001] This divisional application of the present invention has the application number 202311527884.1, the filing date of November 16, 2023, and the invention title of "A miticidal composition containing sulfiflumin and its uses". Technical Field

[0002] The present invention belongs to the technical field of pesticidal miticides, and specifically relates to a miticidal composition containing sulfiflumin and its uses. Background Art

[0003] Panonychus citri is one of the main pests of citrus fruit trees. It overwinters as eggs and adult mites in branch cracks and the back of the leaf surface, and its developmental duration shortens with the increase in temperature. Because Panonychus citri has a fast reproduction rate, many generations, and strong drug resistance, it brings great difficulties to the prevention and control work. The unsatisfactory or untimely prevention and control effect causes many white dots to appear on the front of the damaged leaves, losing their luster. In severe cases, the leaves turn completely pale, resulting in a large amount of defoliation and affecting photosynthesis. When the fruit is severely damaged, it will cause fruit drop, and the surface of the fruit becomes grayish-white, affecting its quality and yield, and causing great economic impact on fruit farmers.

[0004] In recent years, due to the irregular use of pesticides by farmers, Panonychus citri has become increasingly resistant to pesticides, and the control effect of single agents has become worse and worse. Therefore, screening new miticides with high efficiency and low toxicity for controlling Panonychus citri is still an urgent problem to be solved in current citrus production. Through experimental research, the applicant found that the reasonable compounding of sulfiflumin with any one of clofentezine, flufenzine, hexythiazox, or propargite has a dual action mechanism, and has a better control effect compared with single agents and is not prone to drug resistance. Summary of the Invention

[0005] Based on the above content, the purpose of the present invention is to provide a miticidal composition containing sulfiflumin with excellent control effect on harmful mites. The miticidal composition or its preparation can significantly enhance the drug effect, has good fast-acting property, long-lasting effect, is safe for a variety of plants and target organisms, can effectively reduce the amount of pesticide used, reduce production costs, and reduce environmental pollution.

[0006] To achieve the above purpose, the present invention adopts the following technical solution: A miticidal composition containing sulfiflumin, the active ingredients of the miticidal composition include active ingredient A and active ingredient B, the active ingredient A is sulfiflumin, and the active ingredient B is any one of clofentezine, flufenzine, hexythiazox, or propargite;

[0007] Furthermore, the mass ratio of active ingredient A to active ingredient B in the miticidal composition is 1:52 to 56:1.

[0008] Further, the active ingredient B is clofentezine, and the mass ratio of the active ingredient A to the active ingredient B is 1:26 to 48:1;

[0009] Furthermore, the active ingredient B is clofentezine, and the mass ratio of the active ingredient A to the active ingredient B is 1:13 to 32:1;

[0010] Further, the active ingredient B is flufenzine, and the mass ratio of the active ingredient A to the active ingredient B is 1:25 to 40:1;

[0011] Furthermore, the active ingredient is flufenzine, and the mass ratio of the active ingredient A to the active ingredient B is 1:12 to 20:1;

[0012] Further, the active ingredient B is hexythiazox, and the mass ratio of the active ingredient A to the active ingredient B is 1:45 to 35:1;

[0013] Furthermore, the active ingredient B is hexythiazox, and the mass ratio of the active ingredient A to the active ingredient B is 1:35 to 25:1;

[0014] Further, the active ingredient B is propargite, and the mass ratio of the active ingredient A to the active ingredient B is 1:40 to 20:1;

[0015] Furthermore, the active ingredient B is propargite, and the mass ratio of the active ingredient A to the active ingredient B is 1:30 to 10:1;

[0016] Further, the acaricidal composition further comprises auxiliary ingredients in addition to the active ingredients, and the auxiliary ingredients are one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreezing agents, defoaming agents, solvents, preservatives, stabilizers, synergists, binders, fillers or carriers.

[0017] Further, the acaricidal composition can be prepared into a preparation dosage form permitted in pesticides, and the preparation dosage form is a suspension, wettable powder, water dispersible granule, emulsion in water, emulsifiable concentrate, emulsifiable concentrate or microemulsion.

[0018] Furthermore, the preparation dosage form is a suspension, wettable powder, water dispersible granule.

[0019] The present invention also discloses the use of the acaricidal composition as described above for controlling harmful mites.

[0020] Further, the harmful mites are agricultural, forestry or storage harmful mites.

[0021] Furthermore, the harmful mites are Tetranychus urticae, Tetranychus cinnabarinus, Panonychus citri;

[0022] Further, the pest mite is *Panonychus citri* McGregor.

[0023] Further, the acaricidal composition is applied to pest mites and the medium where the pest mites occur.

[0024] The beneficial effects of the present invention are as follows:

[0025] (1) The acaricidal composition of the present invention combines compounds with different action mechanisms, and has an obvious synergistic effect on pest mites;

[0026] (2) Compared with single agents, the acaricidal composition of the present invention reduces the dosage of pesticides, reduces production costs and reduces the environmental pollution of pesticides;

[0027] (3) The acaricidal composition of the present invention slows down the generation of pest mite resistance, is safe for crops and other non-target organisms, reduces the pesticide residues in agricultural products, and is safe and efficient. Specific Embodiments

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the preparation examples and specific examples of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Preparation Examples of Preparations:

[0030] Preparation Example 1: 12% sulfiflumin·clofentezine suspension concentrate (1:5)

[0031] Formulation composition: 2% sulfiflumin, 10% clofentezine, 1% Guerbet alcohol polyoxyethylene ether, 3% alkylphenol polyoxyethylene ether phosphate, 1% sodium polycarboxylate, 0.25% xanthan gum, 5% glycerol, 1% sodium sorbate, 0.5% silicone oil, deionized water to make up the balance;

[0032] Preparation method: According to the formula ratio, the active ingredients, surfactants and other functional auxiliaries are sequentially placed in a reaction kettle, mixed evenly with water, subjected to high-speed shearing and wet grinding, and finally homogenized and filtered to obtain the suspension concentrate product.

[0033] Preparation Example 2: 20% sulfiflumin·clofentezine wettable powder (1:1)

[0034] Formulation composition: 10% sulfiflumin, 10% clofentezine, 8% sodium lignosulfonate, 2% sodium dodecyl sulfate, 5% dispersant NNO, 5% silica white, kaolin to make up the balance;

[0035] Preparation method: According to the formulation composition, mix the active ingredient, dispersant, wetting agent and filler, stir evenly in a stirring kettle, and perform multiple pulverizations and mixing uniformly by an air jet mill to obtain the wettable powder of the composition of the present invention.

[0036] Preparation Example 3: 27% sulfiflumin·tetradifon water dispersible granule (8:1)

[0037] Formulation composition: 24% sulfiflumin, 3% tetradifon, 6% sodium lignosulfonate, 3% Nekal BX, 10% naphthalene sulfonic acid formaldehyde condensate, 5% white sugar, kaolin to make up the balance.

[0038] Preparation method: According to the formula ratio, add the active ingredient to the carrier, add surfactants and other functional auxiliaries thereto, mix, add 10-25% of water after air jet pulverization, and then obtain the water dispersible granule product through kneading, granulation, drying and screening; or spray water, granulate and dry the pulverized powder in a fluidized bed granulator, and then screen to obtain the water dispersible granule product.

[0039] Preparation Example 4: 18% sulfiflumin·flufenzine suspension (5:1)

[0040] Formulation composition: 15% sulfiflumin, 3% flufenzine, 2% Guerbet alcohol polyoxyethylene ether, 2% alkylaryl polyoxyethylene ether polypropylene ether, 3% triphenylvinylphenol ethoxylate phosphate, 1% sodium polycarboxylate, 1.5% magnesium aluminum silicate, 0.1% carboxyethyl cellulose, 0.5% potassium benzisothiazolinone, 5% glycerol, 0.5% silicone oil, deionized water to make up the balance;

[0041] Preparation method: The same as Preparation Example 1.

[0042] Preparation Example 5: 25% sulfiflumin·flufenzine wettable powder (1:4)

[0043] Formulation composition: 5% sulfiflumin, 20% flufenzine, 8% calcium lignosulfonate, 2% sodium dodecyl sulfate, 5% sodium polycarboxylate salt, 5% white carbon black, kaolin to make up the balance;

[0044] Preparation method: The same as Preparation Example 2.

[0045] Preparation Example 6: 20% sulfiflumin·flufenzine water dispersible granule (1:9)

[0046] Formulation composition: 2% sulfiflumin, 18% flufenzine, 10% lignosulfonate, 8% naphthalene sulfonate formaldehyde condensate, 2% sodium dodecyl sulfate, 5% white carbon black, 30% starch, kaolin to make up the balance.

[0047] Preparation method: the same as that of Preparation Example 3.

[0048] Preparation Example 7: 24% sulfiflumin·hexythiazox wettable powder (1.5:22.5)

[0049] Formulation composition: 1.5% sulfiflumin, 22.5% hexythiazox, 8% sodium lignosulfonate, 6% dispersant NNO, 2% sodium dodecyl sulfate, kaolin to make up the balance;

[0050] Preparation method: the same as that of Preparation Example 2.

[0051] Preparation Example 8: 12% sulfiflumin·hexythiazox emulsifiable concentrate (1:1)

[0052] Formulation composition: 6% sulfiflumin, 6% hexythiazox, 20% propylene glycol methyl ether, 12% alkylaryl polyoxyethylene polyoxypropylene ether, 3% calcium dodecylbenzenesulfonate, 10% DMF, methyl oleate to make up the balance;

[0053] Preparation method: According to the formulation ratio, the metered active ingredients, solvents, and cosolvents are added to a mixing kettle and stirred to dissolve them. Then, emulsifiers are added, and the balance is made up with the remaining solvents. After stirring evenly in the stirring kettle and filtering, the emulsifiable concentrate required by the present invention is obtained.

[0054] Preparation Example 9: 18% sulfiflumin·hexythiazox aqueous emulsion (5:1)

[0055] Formulation composition: 15% sulfiflumin, 3% hexythiazox, 6% fatty alcohol polyoxyethylene polyoxypropylene ether, 2% fatty alcohol polyoxyethylene ether sulfate, 12% cyclohexanone, 0.25% xanthan gum, 5% glycerol, 1% sodium sorbate, deionized water to make up the balance;

[0056] Preparation method: According to the formulation ratio, the active ingredients are added together with solvents, emulsifiers, and cosolvents to dissolve into a uniform oil phase; part of the water, antifreeze, and other pesticide adjuvants are mixed together to form a uniform water phase; while stirring at high speed in a reaction kettle, the oil phase is added to the water phase and sheared for about half an hour to form an oil-in-water type aqueous emulsion.

[0057] Preparation Example 10: 13% sulfiflumin·hexythiazox microemulsion (12:1)

[0058] Formulation composition: 12% sulfiflumin, 1% hexythiazox, 2% alkylphenol polyoxyethylene ether, 15% triphenylvinylphenol polyoxyethylene ether, 2% fatty alcohol polyoxyethylene ether phosphate salt, 10% cyclohexanone, 0.5% penetrant JFC, 5% ethylene glycol, deionized water to make up the balance;

[0059] Preparation method: According to the formulation composition, the active ingredient, organic solvent, surfactant, co-surfactant and other additives are stirred and mixed evenly to form an oil phase, and then the aqueous phase is added, and it becomes a microemulsion after slight stirring and shearing.

[0060] Preparation Example 11: 20% sulfiflumin·hexythiazox suspension concentrate (3:1)

[0061] Formulation composition: 15% sulfiflumin, 5% hexythiazox, 2% block polyether, 5% styrylphenol polyoxyethylene ether phosphate, 1% sodium lignosulfonate, 1% isomeric tridecyl alcohol polyoxyethylene ether, 0.2% xanthan gum, 5% ethylene glycol, 0.3% sodium benzoate, 1% silicone defoamer, deionized water to make up the balance;

[0062] Preparation method: The same as Preparation Example 1.

[0063] Preparation Example 12: 22% sulfiflumin·propargite emulsifiable concentrate (7:15)

[0064] Formulation composition: 7% sulfiflumin, 15% propargite, 18% N-methylpyrrolidone, 12% alkylaryl polyoxyethylene polyoxypropylene ether, 3% calcium dodecylbenzenesulfonate, 8% DMF, methyl oleate to make up the balance;

[0065] Preparation method: The same as Preparation Example 8.

[0066] Preparation Example 13: 21% sulfiflumin·propargite wettable powder (1:20)

[0067] Formulation composition: 1% sulfiflumin, 20% propargite, 5% sodium lignosulfonate, 4% dispersant NNO, 2% sodium succinate sulfonate, 30% silica, kaolin to make up the balance;

[0068] Preparation method: According to the formulation composition, propargite and silica are mixed evenly, and then the active ingredient and the dispersant, wetting agent and filler are mixed, and stirred evenly in a stirring kettle, and pulverized and mixed evenly by an air-flow pulverizer for many times to make the wettable powder of the composition of the present invention.

[0069] Preparation Example 14: 13% sulfiflumin·propargite emulsion in water (1:12)

[0070] Formulation composition: 1% sulfiflumin, 12% propargite, 15% acetophenone, 8% alkylaryl polyoxyethylene polyoxypropylene ether, 2% styrylphenol polyoxyethylene ether phosphate, 0.2% xanthan gum, 5% glycerol, 0.2% sodium benzoate, deionized water to make up the balance.

[0071] Preparation method: same as Preparation Example 9.

[0072] Preparation Example 15: 22% sulfiflumin·propargite microemulsion (10:1)

[0073] Formulation composition: 20% sulfiflumin, 2% propargite, 10% triphenylethylphenol polyoxyethylene ether, 5% cyclohexanone, 8% xylene, 1% sodium dodecylbenzenesulfonate, 4% ethylene glycol, 3% sorbitan polyoxyethylene ether, deionized water to make up the balance;

[0074] Preparation method: same as Preparation Example 10.

[0075] Example 1: Indoor biological test

[0076] Test basis: The test refers to NY / T 1154.12 - 2008 "Pesticide indoor bioassay test guidelines Insecticides Part 12: Slide dipping method for spider mites".

[0077] Test target: Panonychus citri McGregor.

[0078] Test preparation: Cut double-sided tape into 2 cm long pieces and stick one end to the slide. Select healthy mites and stick their backs to the double-sided tape (do not stick to the legs, antennae and mouthparts). There are 30 mites per slide. Put them into a container padded with a wet sponge, cover the lid, and place them under the condition of 25 ± 1 °C. After 2 h, examine under a microscope, remove dead and injured individuals, and make up to 30 mites per slide.

[0079] Agent preparation: Dissolve the test agent with a suitable solvent, and prepare 5 series of mass concentration gradients for each single agent and each mixture ratio according to the mixing purpose and agent activity design.

[0080] Agent treatment: Immerse the slide in the liquid medicine and gently shake for 5 s, then take it out, absorb the excess liquid medicine with filter paper, place it in a white porcelain dish padded with a wet sponge, and cover it with a plastic film with good light transmittance. Each treatment has 4 replicates, and a treatment without agent (including all organic solvents and emulsifiers) is set as a blank control.

[0081] Rearing and observation: Place the container with test insects under the conditions of temperature (25 ± 1) °C and photoperiod L:D = (16:8) h for rearing and observation.

[0082] Test investigation: Examine under a microscope 48 h after treatment, check the death situation of test insects, and record the total number of insects and the number of dead insects respectively.

[0083] Use DPS data processing software for data processing, calculate the virulence regression equation, correlation coefficient, LC 50 value, and compare the virulence of the LC 50 values of each treatment.

[0084] Based on the survey data, calculate the mortality rate of each treatment. Calculate according to the following formula:

[0085]

[0086] In the formula:

[0087] P —— Mortality rate, unit is percentage (%);

[0088] K —— Represents the number of dead insects, unit is head;

[0089] N —— Represents the total number of insects in the treatment, unit is head.

[0090]

[0091] In the formula:

[0092] P1 —— Corrected mortality rate, unit is percentage (%);

[0093] P t —— Mortality rate of the treatment, unit is percentage (%);

[0094] P0 —— Mortality rate of the blank control, unit is percentage (%).

[0095] If the mortality rate of the control < 5%, no correction is required; if the mortality rate of the control is between 5% and 20%, correction should be made according to formula (2); if the mortality rate of the control > 20%, the test needs to be redone.

[0096] The co-toxicity coefficient (CTC value) of the mixture is calculated according to formulas (3), (4), and (5):

[0097]

[0098] In the formula:

[0099] ATI —— Measured toxicity index of the mixture;

[0100] S —— LC of the standard acaricide 50 , unit is milligram per liter (mg / L);

[0101] M —— LC of the mixture 50 , unit is milligram per liter (mg / L).

[0102] TTI = TI A ×P A +TI B ×P B

[0103] In the formula:

[0104] TTI —— Theoretical toxicity index of the mixture;

[0105] TI A —— Toxicity index of agent A;

[0106] P A —— Percentage content of agent A in the mixture, in percentage (%);

[0107] TI B —— Toxicity index of agent B;

[0108] P B —— Percentage content of agent B in the mixture, in percentage (%).

[0109]

[0110] Where:

[0111] CTC - Co-toxicity coefficient;

[0112] ATI - Measured toxicity index of the mixture;

[0113] TTI - Theoretical toxicity index of the mixture.

[0114] When the co-toxicity coefficient CTC of the compounding is ≥ 120, it shows a synergistic effect; when CTC ≤ 80, it shows an antagonistic effect; when 80 < CTC < 120, it shows an additive effect.

[0115] The results of the indoor toxicity test are shown in the following table:

[0116] Table 1 Results of the indoor bioactivity test of the compounding of sulfiflumin and clofentezine against Panonychus citri

[0117]

[0118]

[0119] It can be seen from the results of the indoor bioactivity test (Table 1) that compounding sulfiflumin and clofentezine has excellent control effects against Panonychus citri at a certain mass ratio. When the mass ratio of sulfiflumin to clofentezine is 1:26 to 48:1, the co-toxicity coefficient against Panonychus citri is greater than 120, showing a synergistic effect. Among them, when the mass ratio of the two is 1:3, its LC 50 against Panonychus citri is 3.4246 mg / L, the co-toxicity coefficient is the largest, being 186.911, and the synergistic effect is significant; while when the mass ratio of the two is 1:52 and 56:1, the co-toxicity coefficient is less than 120, showing an additive effect.

[0120] Table 2 Indoor bioactivity test of the compounding of sulfiflumin and flufenzine against Panonychus citri

[0121]

[0122] It can be seen from the results of indoor bioactivity tests (Table 2) that the compounding of sulfiflumin and flufenzine has good control effects on Panonychus citri at a certain mass ratio. The compounding mass ratio of sulfiflumin and flufenzine from 1:25 to 40:1 shows a synergistic effect on Panonychus citri. Among them, when the mass ratio of the two is 1:8, the LC 50 for Panonychus citri is 2.9623 mg / L, and the co-toxicity coefficient is up to 197.792, with a significant synergistic effect; while when the mass ratio of the two is 1:50 to 1:32 and 50:1, the co-toxicity coefficient is less than 120, showing an additive effect.

[0123] Table 3 Indoor bioactivity test of the compounding of sulfiflumin and hexythiazox against Panonychus citri

[0124]

[0125]

[0126] It can be seen from the results of indoor bioactivity tests (Table 3) that the compounding of sulfiflumin and hexythiazox has good control effects on Panonychus citri at a certain mass ratio. The compounding mass ratio of sulfiflumin and hexythiazox from 1:45 to 35:1 shows a synergistic effect on Panonychus citri. Among them, when the mass ratio of the two is 1:5, the LC 50 for Panonychus citri is 4.4257 mg / L, and the co-toxicity coefficient is up to 188.375, with a significant synergistic effect; while when the mass ratio of the two is 45:1, the co-toxicity coefficient is less than 120, showing an additive effect.

[0127] Table 4 Indoor bioactivity test of the compounding of sulfiflumin and propargite against Panonychus citri

[0128]

[0129] It can be seen from the results of indoor bioactivity tests (Table 4) that the compounding of sulfiflumin and propargite has good control effects on Panonychus citri at a certain mass ratio. The compounding mass ratio of sulfiflumin and propargite from 1:40 to 20:1 shows a synergistic effect on Panonychus citri. Among them, when the mass ratio of the two is 1:15, the LC 50 for Panonychus citri is 14.9513 mg / L, and the co-toxicity coefficient is up to 213.314, with a significant synergistic effect; while when the mass ratio of the two is 30:1 to 40:1, the co-toxicity coefficient is less than 120, showing an additive effect.

[0130] Example 2: Field efficacy test

[0131] Test site: The test site is located in Lijiazhai citrus orchard, Yongfu Town, Yongfu County, Guangxi. The soil texture of the test site is acidic moist sandy soil. The fertility of the test site is above average, the terrain is flat, and drainage and irrigation are convenient.

[0132] Experimental crops: citrus (Nanfeng mandarin oranges), 5 years old, growing well.

[0133] Experimental design: According to the pesticide field efficacy test criteria, 9 pesticide treatments and blank controls were set up for a total of 10 treatments, with 4 replicates for each treatment, a total of 40 plots, and the plots were arranged in random blocks, with 2 citrus trees in each plot. During the peak period of citrus red spider mites, the tree crowns were sprayed with a WS-16 backpack manual sprayer for foliar spraying, a single hollow conical nozzle, and a working pressure of 0.2-0.4 MPa. Spray according to the multiple of the drug used in the experimental design to fully coat the front and back of the leaves.

[0134] Survey method: Investigate the insect population base before applying the pesticide, and investigate once 3, 15, and 30 days after applying the pesticide. In each plot, investigate 2 trees, and each tree is located in 5 directions: east, south, west, north, and center. In each direction, investigate 5 leaves at a fixed point, check the number of live mites on the front and back of the leaves, and calculate the control effect.

[0135] Calculation method of drug efficacy:

[0136]

[0137] Field efficacy test results and analysis:

[0138] Table 5 Field efficacy test results

[0139]

[0140] Impact on crop safety: After observation, all test drugs are safe for citrus, no phytotoxicity was observed after application, and citrus grew normally.

[0141] Impact on other pests and diseases: No other pests were observed during the test period, and no obvious adverse effects of the test agents on natural enemies and other organisms were observed.

[0142] As can be seen from Table 5, 3 days after application, the control effects of 9 acaricides on Panonychus citri were 55.11% - 91.30%. Among them, the control effects of 20% sulfiflumin·clofentezine wettable powder (1:1), 18% sulfiflumin·flufenzine suspension concentrate (5:1), 12% sulfiflumin·hexythiazox emulsifiable concentrate (1:1), and 13% sulfiflumin·propargite emulsion in water (1:12) were 88.17%, 91.30%, 86.66%, and 85.17% respectively, which were significantly higher than those of 20% clofentezine suspension concentrate, 36% flufenzine suspension concentrate, 5% hexythiazox emulsifiable concentrate, 30% propargite wettable powder, and 20% sulfiflumin suspension concentrate. 15 days after application, the control effects of the 9 acaricides all increased compared with those 3 days after application. The control effects of 20% sulfiflumin·clofentezine wettable powder (1:1), 18% sulfiflumin·flufenzine suspension concentrate (5:1), 12% sulfiflumin·hexythiazox emulsifiable concentrate (1:1), and 13% sulfiflumin·propargite emulsion in water (1:12) were all above 92%. 15 days after application, the control effects of 20% sulfiflumin·clofentezine wettable powder (1:1), 18% sulfiflumin·flufenzine suspension concentrate (5:1), and 12% sulfiflumin·hexythiazox emulsifiable concentrate (1:1) were all above 92%.

[0143] In summary, the acaricidal compositions of each treatment all showed good quick-acting and long-lasting effects, and had good safety, so they could be used in the production for the control of Panonychus citri.

[0144] Although the present invention has been described in detail with general descriptions and specific embodiments above, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A miticidal composition containing sulfiflumin, characterized in that, The active ingredients of the acaricidal composition comprise active ingredient A and active ingredient B. The active ingredient A is sulfiflumin, and the active ingredient B is propargite.

2. The acaricidal composition according to claim 1, characterized in that, In the acaricidal composition, the mass ratio of active ingredient A to active ingredient B is 1:52 to 56:

1.

3. The acaricidal composition according to claim 1, wherein, The mass ratio of active ingredient A to active ingredient B is 1:40 to 20:1, preferably 1:30 to 10:

1.

4. The acaricidal composition according to claim 1, characterized in that, In addition to the active ingredients, the acaricidal composition further comprises auxiliary ingredients, which are one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreezing agents, defoaming agents, solvents, preservatives, stabilizers, synergists, binders, fillers or carriers.

5. The acaricidal composition according to claim 1, characterized in that, The acaricidal composition can be prepared into a preparation dosage form permitted in pesticides. The preparation dosage form is suspension concentrate, wettable powder, water dispersible granules, emulsion in water, emulsifiable concentrate or microemulsion.

6. The acaricidal composition according to claim 5, wherein The preparation dosage form is suspension concentrate, wettable powder, water dispersible granules.

7. Use of the acaricidal composition according to any one of claims 1-6 for controlling harmful mites.

8. The use according to claim 7, characterized in that, The harmful mites are agricultural, forestry or storage harmful mites.

9. The use according to claim 8, characterized in that, The harmful mites are Tetranychus urticae, Tetranychus cinnabarinus and / or Panonychus citri; preferably Panonychus citri.

10. The use according to claim 7, wherein, The acaricidal composition is applied to harmful mites and the medium where harmful mites occur.

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