A miticidal composition and use thereof

Abstract

The application belongs to the technical field of pesticide mite-killing, and discloses a mite-killing composition and application thereof, wherein the active ingredient of the mite-killing composition comprises active ingredient A and active ingredient B; the active ingredient A is a compound of formula I; the active ingredient B is chlorfluazuron; and the mass ratio of the active ingredient A to the active ingredient B is 1:40-48:1. The mite-killing composition has a significant synergistic effect on plant mites, reduces the use amount of chemical pesticides, and reduces pesticide residues and environmental pollution.

Description

Technical Field

[0001] This invention belongs to the field of pesticide acaricide technology, and discloses an acaricide composition and its application. Background Technology

[0002] Spider mites have become major pests of crops in agriculture, forestry, fruit, and floriculture. Commonly known as red spider mites, they occur in various regions. Species causing significant damage include the carmine spider mite, the two-spotted spider mite, the truncate spider mite, the hawthorn spider mite, and the citrus spider mite. Spider mites are tiny and primarily damage leaves. Nymphs and adults often congregate on the underside of leaves to suck sap, causing grayish-white or yellowish-brown spots. In severe cases, leaves dry out and fall off. They also damage tender shoots, buds, and fruits. A rapid increase in mite populations often inhibits plant growth or even causes death. Affected crops are often stunted, and their quality and yield are significantly reduced. Spider mites' high reproductive rate, short generation cycle, and frequent exposure to pesticides make them highly susceptible to developing resistance. The use of single chemical pesticides has led to spider mites rising from a secondary pest to a major one, making their control extremely difficult. Currently, the spider mite problem has become a prominent issue in agricultural production.

[0003] In production practice, the rational combination of acaricides is one of the effective measures to overcome and delay the development of acaricide resistance, and can effectively control mite damage. Therefore, the technology of compounding and mixing acaricides is currently a major research focus. The inventors studied the effect of compounding compound I with fluazinam, thereby providing a basis for integrated pest management in production. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an acaricidal composition and its application. This acaricidal composition is a rational combination of a compound of Formula I with different mechanisms of action and fluazinam. Within a certain mass ratio range, it has a significant synergistic effect on the control of two-spotted spider mites and citrus parsnipoma, reduces the development of pesticide resistance in pests, and lowers the amount of pesticides used. It can be used for the integrated control of phytophagous mites.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an acaricidal composition and its application, wherein the active ingredients of the acaricidal composition include active ingredient A and active ingredient B, and active ingredient A is a compound of formula I: The active ingredient B is fluazinamurea, and the mass ratio of active ingredient A to active ingredient B is 1:40 to 48:1;

[0006] Furthermore, the mass ratio of active ingredient A to active ingredient B in the acaricidal composition is 1:40 to 32:1;

[0007] Furthermore, the mass ratio of active ingredient A to active ingredient B is 1:40 to 20:1, such as 1:40, 1:30, 1:20, 1:15, 1:5, 1:2, 2:1, 5:1, 10:1, 20:1 or any value between these values.

[0008] Furthermore, the mass ratio of active ingredient A to active ingredient B is 1:24 to 32:1, such as 1:32, 1:24, 1:12, 1:6, 1:3, 3:1, 6:1, 12:1, 24:1, 32:1, 48:1 or any value between these values;

[0009] Furthermore, the mass ratio of active ingredient A to active ingredient B in the acaricidal composition is 1:32 to 20:1;

[0010] Furthermore, the total weight of the acaricidal composition is 100 wt%, and the active ingredients A and B account for 0.5% to 80% of the total weight of the acaricidal composition.

[0011] Furthermore, in addition to the active ingredient, the acaricide composition also contains pesticide-permitted auxiliary ingredients, which are selected from one or more of the following: wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoamers, solvents, preservatives, stabilizers, synergists, or carriers.

[0012] The wetting agent is selected from one or more of the following: alkylbenzene sulfonate, alkylnaphthalene sulfonate, lignin sulfonate, sodium dodecyl sulfate, sodium dioctyl succinate sulfonate, α-olefin sulfonate, alkylphenol polyoxyethylene ether, castor oil polyoxyethylene ether, alkylphenol ethoxylate, fatty alcohol ethoxylate, sodium fatty alcohol polyoxyethylene ether sulfate, silkworm excrement, soapberry powder, soapberry powder, SOPA, detergent, emulsifier 2000 series, and wetting and penetrating agent F; and / or

[0013] The dispersant is selected from one or more of the following: lignin sulfonates, alkyl naphthalene sulfonates formaldehyde condensates, naphthalene sulfonates, tristyrylphenol ethoxylate phosphates, fatty alcohol ethoxylates, alkylphenol polyoxyethylene ethers, alkylphenol polyoxyethylene ether methyl ether condensates sulfates, fatty amine polyoxyethylene ethers, glycerol fatty acid ester polyoxyethylene ethers, polycarboxylates, polyacrylic acids, phosphates, EO-PO block copolymers, and EO-PO graft copolymers; and / or

[0014] The emulsifier is selected from one or more of the following: calcium dodecylbenzenesulfonate, alkylphenol formaldehyde resin polyoxyethylene ether, phenethylphenol polyoxyethylene polyoxypropylene ether, fatty alcohol ethylene oxide-propylene oxide copolymer, styrene-phenol polyoxyethylene ether, castor oil polyoxyethylene ether, and alkylphenol ether phosphate ester; and / or

[0015] The thickener is selected from one or more of xanthan gum, organobentonite, gum arabic, sodium alginate, magnesium aluminum silicate, carboxymethyl cellulose, and silica; and / or

[0016] The disintegrant is selected from one or more of sodium sulfate, ammonium sulfate, aluminum chloride, sodium chloride, ammonium chloride, bentonite, glucose, sucrose, starch, cellulose, urea, sodium carbonate, sodium bicarbonate, citric acid, and tartaric acid; and / or

[0017] Antifreeze is selected from one or more of alcohols, alcohol ethers, chlorinated hydrocarbons, and inorganic salts; and / or

[0018] Defoamer selected from C 10 -C 20 Saturated fatty acid compounds, silicone oil, silicone compounds, C8-C 10 One or more of the fatty alcohols; and / or

[0019] The solvent is selected from one or more of benzene, toluene, xylene, mesitylene, methanol, ethanol, isopropanol, n-butanol, dimethyl sulfoxide, dimethylformamide, cyclohexanone, hydrocarbon carbonates, diesel oil, solvent oil, vegetable oil, vegetable oil derivatives, and water; and / or

[0020] The preservative is selected from one or more of propionic acid, sodium propionate, sorbic acid, sodium sorbate, potassium sorbate, benzoic acid, sodium benzoate, sodium p-hydroxybenzoate, methyl p-hydroxybenzoate, Kathon, and 1,2-benzisothiazolin-3-one; and / or

[0021] The stabilizer is selected from one or more of the following: disodium hydrogen phosphate, oxalic acid, succinic acid, adipic acid, borax, 2,6-di-tert-butyl-p-cresol, triethanolamine oleate, epoxidized vegetable oil, kaolin, bentonite, attapulgite, silica, talc, montmorillonite, and starch; and / or

[0022] Synergists are selected from synergistic phosphorus, synergistic ether; and / or

[0023] The carrier is selected from one or more of the following: ammonium salts, ground natural minerals, ground artificial minerals, silicates, resins, waxes, solid fertilizers, water, organic solvents, mineral oils, vegetable oils, and vegetable oil derivatives.

[0024] Furthermore, the acaricidal composition is prepared into a pesticide-acceptable formulation, wherein the formulation is a solid or liquid formulation.

[0025] Furthermore, the solid dosage forms include powders, granules, balls, tablets, strips, wettable powders, oil-dispersible powders, emulsion powders, water-dispersible granules, emulsion granules, water-dispersible tablets, soluble powders, soluble tablets, or soluble granules;

[0026] The liquid formulations include soluble agents, colloids, oils, spreading oils, emulsions, latexes, dispersible liquids, ointments, water emulsions, oil emulsions, microemulsions, lipid suspensions, microcapsule suspensions, oil suspensions, dispersible oil suspensions, suspensions, microcapsule suspension-suspension agents, microcapsule suspension-water emulsions, or microcapsule suspension-suspension emulsions.

[0027] Furthermore, the solid formulation is a water-dispersible granule, and the liquid formulation is an emulsifiable concentrate, a suspension concentrate, or a suspension emulsion.

[0028] The present invention also discloses the application of the acaricidal composition described above for the control of plant mites.

[0029] Furthermore, the mites mentioned are spider mites.

[0030] Furthermore, the Tetranychidae family of pests includes two-spotted spider mite, carmine spider mite, citrus spider mite, truncate spider mite, citrus spider mite, Kanzawa spider mite, apple spider mite, citrus spider mite and / or wheat mite;

[0031] Furthermore, the spider mites mentioned are *Tetranychus carmineus*, *Tetranychus two-spotted*, and *Tetranychus citrus*.

[0032] The beneficial effects of this invention are as follows: Compared with single agents, this invention rationally combines active ingredients with different mechanisms of action, which have a significant synergistic effect within a suitable mass ratio range, improving the prevention and control effect while helping to overcome and delay the development of drug resistance; it also reduces the amount of agent used, thereby reducing production costs and environmental pollution. Detailed Implementation

[0033] To make the technical solution, objectives and advantages of the present invention clearer, the present invention is described with reference to the following specific embodiments. However, the present invention can be implemented in various forms and should not be limited to the embodiments described herein.

[0034] Preparation Example 1: 16% Formula I compound·flufenican emulsifiable concentrate (1:15)

[0035] Formulation composition: 1% Formula I compound, 15% fluazinam urea, 15% DMF, 12% Gelbert alcohol polyoxyethylene ether, 3% calcium dodecylbenzene sulfonate, 18% propylene carbonate, xylene to make up the balance;

[0036] Preparation method: According to the formula ratio, the measured active ingredients, solvents and co-solvents are added to the mixing tank and stirred to dissolve them. Then, the emulsifier is added, and the remaining solvent is used to make up the balance. The mixture is stirred evenly in the mixing tank and filtered to obtain the emulsifiable oil required by this invention.

[0037] Preparation Example 2: 6% Compound I Fluoridure Emulsifiable Concentrate (5:1)

[0038] Formulation composition: 5% Formula I compound, 1% fluazinamide, 18% N-methylpyrrolidone, 10% alkylaryl polyoxyethylene ether polyoxypropylene ether, 2% calcium dodecylbenzenesulfonate, 12% DMF, methyl oleate to make up the balance;

[0039] Preparation method: Same as in preparation example 1.

[0040] Preparation Example 3: 21% Formula I compound·flufenican urea suspension (1:6)

[0041] Formula composition: 3% Formula I compound, 18% fluazinam urea, 1% phenethylphenol polyoxyethylene polyoxypropylene ether, 2% naphthalene sulfonate formaldehyde condensate, 2% tristyrylphenol ethoxylated phosphate, 2% alkylaryl polyoxyethylene ether polyoxypropylene ether, 0.25% xanthan gum, 1% magnesium aluminum silicate, 5% ethylene glycol, 0.1% sodium benzoate, 0.5% silicone oil, deionized water to make up the balance;

[0042] Preparation method: According to the formula ratio, the active ingredients, surfactants and other functional additives are placed in the reaction vessel in sequence, water is added and mixed evenly, and then subjected to high-speed shearing, wet sand milling and finally homogenization filtration to obtain the suspension product.

[0043] Preparation Example 4: 26% Formula I compound·flufenican urea suspension (12:1)

[0044] Formula composition: 24% Formula I compound, 2% fluazinam urea, 5% isotridecyl alcohol polyoxyethylene ether, 5% polyoxyethylene dehydrated sorbitan monooleate, 1% sodium polycarboxylate, 3% tristyrylphenol ethoxylated phosphate, 0.3% xanthan gum, 5% ethylene glycol, 0.1% sodium benzoate, 0.5% silicone oil, deionized water to make up the balance;

[0045] Preparation method: Same as in preparation example 3.

[0046] Preparation Example 5: 24% Formula I compound·flufenicanurine water-dispersible granules (1:3)

[0047] Formula composition: 6% Formula I compound, 18% fluazinamide, 13% lignin sulfonate, 5% naphthalene sulfonate formaldehyde condensate, 2% sodium dodecyl sulfate, 3% silica, 25% starch, kaolin to make up the balance;

[0048] Preparation method: According to the formula ratio, add the active ingredients to the carrier, and add surfactants and other functional additives to it. Mix, and after air jet pulverization, add 10-25% water. Then knead, granulate, dry and sieve to obtain water-dispersible granules; or spray water, granulate and dry the pulverized powder in a fluidized bed granulator, and then sieve to obtain the product.

[0049] Preparation Example 6: 22% Formula I compound·flufenicanurine water-dispersible granules (1:10)

[0050] Formula composition: 2% Formula I compound, 20% fluazinamamide, 10% naphthalenesulfonate formaldehyde condensate, 2% sodium polycarboxylate, 5% stretching powder BX, kaolin to make up the balance;

[0051] Preparation method: Same as in preparation example 5.

[0052] Preparation Example 7: 6% Formula I compound·flufenicanurine suspension emulsion (1:2)

[0053] Formulation composition: 2% Formula I compound, 4% fluazinamamide, 1% lignin sulfonate, 1% naphthalene sulfonate formaldehyde condensate, 2% alkylphenol polyoxyethylene ether, 3% tristyrylphenol ethoxylate phosphate, 3% EO-PO block copolymer, 5% glycerol, 0.2% xanthan gum, 1% magnesium aluminum silicate, 0.5% silicone defoamer, 12% 200# solvent oil, 0.1% isothiazolinone, deionized water to make up the balance;

[0054] Preparation method: According to the formula ratio, the compound of formula I is completely dissolved in a solvent to prepare an oil phase. Fluorinium urea, wetting and dispersing agent, antifreeze agent, defoamer, deionized water, etc. are wet-milled to D. 90 A suspension mother liquor with a particle size of less than 5μm is prepared; after adding the oil phase to the suspension mother liquor and stirring evenly, a thickener is added and stirred and sheared evenly to prepare the suspension emulsion product.

[0055] Preparation Example 8: 9% Formula I compound·flufenicanurine suspension emulsion (8:1)

[0056] Formula composition: 8% Formula I compound, 1% fluazinamide, 1% sodium lignosulfonate, 4% tristyrylphenol polyoxyethylene ether phosphate, 1% sodium polycarboxylate, 1% fatty alcohol polyoxyethylene ether, 25% 200# solvent oil, 3% alkylphenol polyoxyethylene ether, 0.1% potassium benzisothiazolinone, 0.25% xanthan gum, 1% magnesium aluminum silicate, 5% propylene glycol, 0.25% silicone defoamer, deionized water to make up the balance;

[0057] Preparation method: Same as in preparation example 7.

[0058] Indoor bioactivity test

[0059] Example 1: Indoor bioactivity test of compound I combined with fluazinam on spider mites

[0060] Test basis: The test was conducted in accordance with NY / T 1154.12-2008 "Test Guidelines for Indoor Bioactivity Determination of Pesticides - Insecticides - Part 12: Tetranychus Slide Immersion Method".

[0061] Experimental targets: adult female Tetranychus spp. and Pseudococcus citrinum.

[0062] Test reagents: Formula I compound technical grade, fluazinam technical grade.

[0063] Pharmaceutical preparation: Prepare a stock solution by using a suitable solvent, and then dilute it with a 0.1% Tween 80 aqueous solution to prepare 5 series of concentration gradients.

[0064] Experimental Method: Cut double-sided tape into 2cm lengths and attach them to one end of a glass slide. Select healthy test mites and attach their backs to the tape, 30 mites per slide. Place the slides in a container lined with a damp sponge, cover, and incubate at (25±1)℃ for 2 hours. After 2 hours, examine under a microscope, remove dead and injured individuals, and replenish to 30 mites per slide. Immerse the slides in the reagent solution, gently shake for 5 seconds, remove, absorb excess reagent with absorbent paper, place in a white porcelain dish lined with a damp sponge, and cover with a translucent plastic film. Each treatment was repeated 4 times, and a treatment without the reagent (containing all organic solvents and emulsifiers) was set up as a blank control.

[0065] Inspection: Conduct an inspection 48 hours after treatment to check the mortality of the mites and record the total number of mites and the number of dead mites.

[0066] Data statistics and analysis:

[0067] Based on the survey data, the corrected mortality rates for each treatment were calculated using the following formula, and the results were rounded to two decimal places.

[0068]

[0069] In the formula:

[0070] P – Mortality rate, expressed as a percentage (%);

[0071] K represents the number of dead insects, in heads;

[0072] N represents the total number of insects treated, in units of heads.

[0073]

[0074] In the formula:

[0075] P1 – Corrected mortality rate, in percentage (%);

[0076] P t —The mortality rate is expressed as a percentage (%).

[0077] P0 – Mortality rate in the blank control group, expressed as a percentage (%).

[0078] If the control mortality rate is <5%, no correction is needed; if the control mortality rate is between 5% and 20%, correction should be performed according to the corrected mortality rate formula; if the control mortality rate is >20%, the trial needs to be repeated.

[0079] The LC was determined using the DPS statistical analysis system. 50 The value is used to evaluate the activity of the test reagent on the biological sample.

[0080] The co-toxicity coefficient (CTC value) of the mixture is calculated using the following formula:

[0081]

[0082] In the formula:

[0083] ATI – Actual Measured Toxicity Index of Mixtures;

[0084] S – LC50 of standard acaricides 50 The unit is milligrams per liter (mg / L);

[0085] M – LC of the mixture 50 The unit is milligrams per liter (mg / L).

[0086] TTI = TI A ×P A +TI B ×P B

[0087] In the formula:

[0088] TTI – Theoretical Toxicity Index of Mixtures;

[0089] TI A —A. Toxicity index of drug A;

[0090] P A —Percentage content of drug A in the mixture, expressed as percentage (%);

[0091] TI B —Toxicity index of drug B;

[0092] P B —Percentage content of agent B in the mixture, expressed as percentage (%).

[0093]

[0094] In the formula:

[0095] CTC – Cotoxicity Coefficient;

[0096] ATI – Actual Measured Toxicity Index of Mixtures;

[0097] TTI – Theoretical Toxicity Index of Mixtures.

[0098] The co-toxicity coefficient of the compound is ≥120, which shows a synergistic effect; CTC≤80 shows an antagonistic effect; and 80<CTC<120 shows an additive effect.

[0099] The indoor activity test results are shown in the table below:

[0100] Table 1. Results of indoor bioactivity assays of compound I combined with flufenoxuron on Tetranychus bistigma.

[0101]

[0102]

[0103] Table 2: Results of indoor bioactivity assay of compound I and flufenoxuron in citrus pseudococcus.

[0104]

[0105] The experimental results in Tables 1 and 2 show that the combination of compound I with fluazinam exhibits good activity against Tetranychus bicolor or Tetranychus citrus.

[0106] When the mass ratio of compound I to fluazinam is 1:40 to 20:1, the co-toxicity coefficient against Tetranychus bisporus is greater than 120, showing a synergistic effect; when the mass ratio is 1:30 to 10:1, the co-toxicity coefficient against Tetranychus bisporus is greater than 140, showing a significant synergistic effect; while when the mass ratio is 30:1, the co-toxicity coefficient is less than 120, showing an additive effect.

[0107] When the mass ratio of compound I to fluazinam is 1:24 to 32:1, the co-toxicity coefficient against *Paecilomyces citrus* is greater than 120, showing a synergistic effect; when the mass ratio is 1:24 to 24:1, the co-toxicity coefficient against *Paecilomyces citrus* is greater than 130, showing a significant synergistic effect; while when the mass ratio is 1:32 or 48:1, the effect is additive.

[0108] Field efficacy trials

[0109] Example 1: Field efficacy test for controlling cotton spider mites

[0110] Experimental location: Liu'e Village, Cuimiao Town, Funing County, Jiangsu Province. The management level of each plot in the experimental area was consistent.

[0111] Experimental target: cotton red spider mite.

[0112] Experimental crop: Cotton (Su Mian 9).

[0113] Test reagents: The test reagents are listed in the table below.

[0114] Plot arrangement: The experimental reagent, control reagent, and blank control were arranged in a randomized block design, with a plot area of ​​66.7 m².2 Each treatment was repeated 4 times.

[0115] Experimental method: On August 20, 2023, the cotton plants were sprayed with a Jacto PJ-16 manual sprayer. The initial mite population was investigated before the application of the pesticide, and then again on the 3rd and 7th day after the application, for a total of 3 investigations.

[0116] Survey method: During the survey, 10 cotton plants were surveyed at a fixed point in each plot. Five leaves from different parts of each plant were tagged and marked. 50 leaves from each plant in each plot were tagged and surveyed to investigate the initial mite population and the number of surviving mites.

[0117] Methods for calculating drug efficacy:

[0118]

[0119]

[0120] The experimental results are shown in Table 3:

[0121] Table 3 Results of field efficacy trials for controlling cotton spider mites

[0122]

[0123] Safety survey results: According to observations on the 3rd and 7th days after application, the cotton in each treatment area grew normally, and no obvious abnormalities such as plant discoloration, deformity, or yellowing of leaf tips were observed.

[0124] Three days after application, all four treatments in the compound treatment group showed good control effects against cotton spider mites. Seven days after application, the compound treatment group showed even better control effects, with control efficacy reaching over 92%, which was higher than the conventional single-agent control.

[0125] Example 2: Field efficacy test for controlling citrus red spider mites

[0126] Experimental basis: The experiment was conducted in accordance with GB / T 17980.11-2000 "Guidelines for Field Efficacy Tests of Pesticides (I) Acaricides for the Control of Citrus Paronychia".

[0127] Experimental target: Citrus red spider mite.

[0128] Experimental crop: Satsuma mandarin orange.

[0129] Experimental site: Matou Village, Tanxia Town, Lingchuan County, Guilin City. The experimental site has flat terrain, moderate soil fertility, good sunlight conditions, and consistent fertilizer and water management levels.

[0130] Experimental plot arrangement: each treatment was replicated 4 times, with 2 citrus trees per plot and protective trees set up between plots.

[0131] Experimental method: The stems and leaves of citrus trees were evenly sprayed using a MATA-BI Super Green 16 backpack sprayer. One application was made during the initial peak period of the citrus paronychia mite. Live mite counts were recorded at 3 days and 10 days after application.

[0132] Survey method: Two trees were surveyed per plot each time. On each tree, one spring shoot with mites was marked in each of the five directions of the canopy (east, south, west, north, and center). The number of live mites on 50 leaves in each plot was surveyed.

[0133] Methods for calculating drug efficacy:

[0134]

[0135]

[0136] The test results are shown in Table 4:

[0137] Table 4 Results of field efficacy trials for controlling citrus red spider mites

[0138]

[0139] As shown in Table 4, the rational combination of compound I with fluazinam exhibits good control effects against citrus paronychia and can effectively control the damage caused by the mite. Three days after application, the control efficacy was significantly higher than that of the single-agent control, demonstrating good rapid-acting properties; 10 days after application, the control efficacy of each compound preparation was greater than 92.34%, with a relatively long residual effect.

[0140] During the above field efficacy trials, irregular observations were conducted, and no visible phytotoxicity symptoms were found in the crops tested by any of the formulations in the examples. The crops grew well after application.

[0141] The results of the above indoor and field efficacy tests clearly show that the compound of Formula I combined with fluazinam, under appropriate mass ratio, exhibits excellent control effects against common crop mites, with significant synergistic effects. Moreover, each acaricide composition has good rapid action, long-lasting effect, reduces the amount of pesticide used, does not cause phytotoxicity to crops, and is safe for the environment, making it suitable for widespread use.

[0142] It should be understood that the above embodiments are merely some embodiments of the present invention, provided only to better understand the embodiments of the present invention, and are not all embodiments of the present invention. In practical applications, by adjusting the content of each component and the composition of the components in the present invention, different and numerous embodiments can be obtained, all of which are within the scope of the present invention.

Claims

1. An acaricidal composition, characterized by comprising, The active ingredient of the acaricidal composition comprises active ingredient A and active ingredient B, the active ingredient A is a compound of formula I: (formula I), the active ingredient B is chlorfluazuron, and the mass ratio of the active ingredient A to the active ingredient B is 1:40-20:

1.

2. The acaricidal composition according to claim 1, characterized by The mass ratio of the active ingredient A to the active ingredient B in the acaricidal composition is 1:32-20:

1.

3. The acaricidal composition according to claim 1, characterized by The mass ratio of the active ingredient A to the active ingredient B in the acaricidal composition is 1:40, 1:30, 1:20, 1:15, 1:5, 1:2, 2:1, 5:1, 10:1 or 20:

1.

4. The acaricidal composition according to claim 1, characterized by The total weight of the acaricidal composition is 100 wt%, and the active ingredient A and the active ingredient B account for 0.5%-80% of the total weight of the acaricidal composition.

5. The acaricidal composition according to claim 1, characterized by The acaricidal composition further comprises an auxiliary component allowed in pesticides, and the auxiliary component is selected from one or more of wetting agents, dispersants, emulsifiers, thickening agents, disintegrants, antifreezing agents, antifoaming agents, solvents, preservatives, stabilizers, synergists or carriers.

6. The acaricidal composition according to claim 1, characterized by The acaricidal composition is prepared into a formulation acceptable in pesticides, which is a solid formulation or a liquid formulation.

7. The acaricidal composition according to claim 6, characterized by The solid formulation is a water dispersible granule, and the liquid formulation is an emulsifiable concentrate, a suspension concentrate or a suspoemulsion.

8. Use of a miticidal composition according to any one of claims 1 to 7 for the control of plant-damaging mites, characterized in that, The harmful mites are Tetranychus urticae or Panonychus citri.

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