Acaricidal composition containing propargite and application thereof

Abstract

The invention belongs to the technical field of pesticide mite killing, and discloses a propargite-containing mite killing composition and application thereof.The propargite-containing mite killing composition comprises an active component A and an active component B. The active component A is a compound shown in the formula I: # imgabs0 # (the formula # imgabs1 # is shown in the description, the active component B is propargite, and the mass ratio of the active component A to the active component B is 1: 50-42: 1. The acaricidal composition disclosed by the invention has an obvious synergistic effect on common plant mites, and meanwhile, the phytotoxicity of crops is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticide acaricide and relates to a miticide composition containing propargyl chlorpyrifos and application thereof. Background Art

[0002] Agricultural mites are an important pest and one of the obstacles to current agricultural production. Due to the improper use of insecticides and miticides, mites have become a type of pest that is difficult to control in agricultural production.

[0003] Promethazine, also known as cypermethrin, is an organic sulfur acaricide with high efficiency, low toxicity, broad spectrum and long lasting effect, which can effectively prevent and control the damage of mites. It has the advantages of good control effect, low cost and low resistance. It is currently a commonly used agent in the prevention and control of pesticide mites. However, Promethazine is used in the spring shoots and tender leaves stage. Since farmers use a relatively high dosage, it is easy to cause pesticide damage to tender shoots, tender leaves, flowers and young fruits of oranges, affecting the tree vigor and, in severe cases, affecting the yield.

[0004] At present, there are few effective miticides, and there are many synonyms for the same substance. In addition, some fruit farmers are accustomed to using a drug that they think has a good control effect. As a result, repeated use of drugs has caused the mites to develop resistance to some drugs, making the control effect worse and worse. In order to achieve better control effects, some fruit farmers arbitrarily increase the concentration or dosage of drugs, which accelerates the development of resistance of mites. In addition, the use of some drugs at high concentrations is prone to cause drug damage. Summary of the invention

[0005] Based on the deficiencies in the prior art, the object of the present invention is to provide a miticide composition containing chlorfenapyr, which has a significant synergistic effect on common plant pests and reduces the damage to crops and the dosage of the medicine.

[0006] In order to achieve the above objectives, the present invention adopts the following technical scheme: a miticide composition containing propargyl chlorpyrifos, wherein the miticide composition comprises active ingredient A and active ingredient B, wherein the active ingredient A is a compound of formula I: The active ingredient B is propargyl sulfamethoxam;

[0007] Furthermore, the mass ratio of the active ingredient A to the active ingredient B is 1:42 to 35:1;

[0008] Furthermore, the mass ratio of the active ingredient A to the active ingredient B is 1:35 to 30:1;

[0009] Furthermore, the total weight of the acaricide combination is 100 wt%, and the total weight of the active ingredient A and the active ingredient B accounts for 1% to 80% of the total weight of the acaricide combination;

[0010] Furthermore, the acaricide composition contains, in addition to the active ingredient, auxiliary ingredients permitted in pesticides, and the auxiliary ingredients are selected from one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoaming agents, solvents, preservatives, stabilizers, synergists or carriers;

[0011] Further, the wetting agent is selected from one or more of 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, fatty alcohol polyoxyethylene ether sodium sulfate, silkworm feces, saponin powder, soapberry powder, SOPA, detergent, emulsifier 2000 series and wetting penetrant F; and / or

[0012] The dispersant is selected from one or more of lignin sulfonate, alkylnaphthalene sulfonate formaldehyde condensate, naphthalene sulfonate, tristyrylphenol ethoxylate phosphate, fatty alcohol ethoxylate, alkylphenol polyoxyethylene ether, alkylphenol polyoxyethylene ether methyl ether condensate sulfate, fatty amine polyoxyethylene ether, glycerol fatty acid ester polyoxyethylene ether, polycarboxylates, polyacrylic acid, phosphates, EO-PO block copolymers and EO-PO graft copolymers; and / or

[0013] The emulsifier is selected from one or more of calcium dodecylbenzene sulfonate, alkylphenol formaldehyde resin polyoxyethylene ether, phenylethylphenol polyoxyethylene polyoxypropylene ether, fatty alcohol ethylene oxide-propylene oxide copolymer, styrylphenol polyoxyethylene ether, castor oil polyoxyethylene ether and alkylphenol ether phosphate; and / or

[0014] The thickener is selected from one or more of xanthan gum, organobentonite, gum arabic, sodium alginate, magnesium aluminum silicate, carboxymethyl cellulose and white carbon black; and / or

[0015] Disintegrants: The disintegrants are 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

[0016] The antifreeze agent is selected from one or more of alcohols, alcohol ethers, chlorinated hydrocarbons and inorganic salts; and / or

[0017] The defoamer is selected from C 10 -C 20 Saturated fatty acid compounds, silicone oil, silicone compounds, C8-C 10 One or more of fatty alcohols; and / or

[0018] The solvent is selected from one or more of benzene, toluene, xylene, durene, methanol, ethanol, isopropanol, n-butanol, dimethyl sulfoxide, dimethylformamide, cyclohexanone, alkylene carbonate, diesel, solvent oil, vegetable oil, vegetable oil derivatives and water; and / or

[0019] The preservative is selected from one or more of propionic acid, sodium propionic acid, sorbic acid, sodium sorbic acid, potassium sorbic acid, benzoic acid, sodium benzoic acid, sodium p-hydroxybenzoic acid, methyl p-hydroxybenzoate, kasone and 1,2-benzisothiazolin-3-one; and / or

[0020] The stabilizer is selected from one or more of 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, white carbon black, talc, montmorillonite and starch; and / or

[0021] The synergist is selected from synergist phosphite, synergist ether; and / or

[0022] The carrier is selected from one or more of ammonium salts, ground natural minerals, ground artificial minerals, silicates, resins, waxes, solid fertilizers, water, organic solvents, mineral oils, vegetable oils and vegetable oil derivatives;

[0023] Furthermore, the acaricide composition can be prepared into any formulation form permitted by pesticides, and the formulation form is a solid formulation or a liquid formulation;

[0024] The solid preparations include powders, granules, pellets, tablets, strips, wettable powders, oil-dispersible powders, emulsion powders, water-dispersible granules, emulsion granules, water-dispersible tablets, soluble powders, soluble tablets or soluble granules;

[0025] The liquid preparations include soluble solutions, soluble gels, oils, film-spreading oils, emulsifiable concentrates, latexes, dispersible solutions, ointments, aqueous emulsions, oil emulsions, microemulsions, lipid suspensions, microcapsule suspensions, oil suspensions, dispersible oil suspensions, suspoemulsions, microcapsule suspension-suspensions, microcapsule suspension-water emulsions or microcapsule suspension-suspoemulsions;

[0026] Furthermore, the formulation is in the form of emulsifiable concentrate, microemulsion, aqueous emulsion, wettable powder or water dispersible granules.

[0027] The invention also discloses the use of the acaricidal composition for preventing and controlling plant pest mites.

[0028] Furthermore, the plant pest mites are pest mites of the Tetranychus family or the Myrmecophaga family;

[0029] Furthermore, the pest mites of the Tetranychidae family are two-spotted spider mites, cinnabarinus spider mites, citrus panonychus mite, citrus spider mites, six-spotted spider mites, citrus split-nail mite or truncate spider mites, and the pest mites of the Gall Mites family are citrus rust mite and wolfberry gall mite.

[0030] The beneficial effects of the present invention are as follows:

[0031] 1. The present invention rationally compounds acaricides with different action mechanisms, and has excellent control effects on various plant pests and mites, with significant synergistic effects;

[0032] 2. The acaricide composition of the present invention reduces the pesticide damage to crops, is safe to plants and non-target organisms, reduces the dosage of the pesticide, and reduces agricultural production costs. DETAILED DESCRIPTION

[0033] In order to make the technical solutions, objectives and advantages of the present invention more clearly understood, the present invention is described with the following specific embodiments, but the present invention can be implemented in various forms and should not be limited by the embodiments described herein.

[0034] Preparation Example:

[0035] Preparation Example 1: 55% Formula I compound·Prochlorperamide EC (1:10)

[0036] Formula: 5% compound of formula I, 50% propargyl sulfonate, 10% DMF, 3% succinate sulfonate, 12% phenethylphenol polyoxyethylene ether, 3% alkylphenol polyoxyethylene ether, and xylene makes up the balance;

[0037] Preparation method: add the measured active ingredients, solvents and co-solvents into a mixing kettle and stir to dissolve them, then add an emulsifier, make up the balance with the remaining solvent, stir evenly in a stirring kettle, and filter to obtain the desired emulsifiable concentrate of the present invention.

[0038] Preparation Example 2: 27% Formula I compound·Profenbate microemulsion (1:8)

[0039] Formula: 3% compound of formula I, 24% chlorfenapyr, 12% cyclohexanone, 10% styrylphenol polyoxyethylene ether, 2% alkylphenol polyoxyethylene ether phosphate, 3% calcium dodecylbenzene sulfonate, 2% sodium sulfate of fatty alcohol polyoxyethylene ether, 0.1% organosilicon defoamer, 4% ethylene glycol, 0.5% glycerol, 0.1% xanthan gum, 0.1% kason, and deionized water to make up the balance;

[0040] Preparation method: According to the formula ratio of the embodiment, the active ingredients, solvents, emulsifiers, etc. are mixed to obtain the oil phase, the antifreeze agent and water are mixed to obtain the water phase, the oil phase is added to the water phase under stirring and stirred evenly, the shearing is continued for 10 minutes, and then the defoaming agent is added and stirred evenly to obtain small droplets of oil phase particles of 0.01 to 0.1 microns, that is, the microemulsion product is obtained.

[0041] Preparation Example 3: 26% Formula I compound·Profenbate aqueous emulsion (12:1)

[0042] Formula: 24% compound of formula I, 2% chlorfenapyr, 1% isomeric tridecanol polyoxyethylene ether, 1% styrylphenol polyoxyethylene ether, 6% EO-PO block copolymer, 20% cyclohexanone, 0.15% xanthan gum, 5% glycerol, 0.1% sodium benzoate, 0.1% silicone oil, and deionized water to make up the balance;

[0043] Preparation method: According to the formula ratio of the preparation example, the active ingredient is dissolved in the solvent and an emulsifier is added to dissolve it into a uniform oil phase. Deionized water and antifreeze are mixed together to form a uniform water phase; under high-speed shearing, the water phase is added to the oil phase to form a well-dispersed water emulsion product.

[0044] Preparation Example 4: 30% Formula I compound·Prochlorperamide wettable powder (5:1)

[0045] Formula: 25% compound of formula I, 5% propargyl sulfonate, 2% sodium lauryl sulfate, 10% calcium lignin sulfonate, 5% naphthalene sulfonate, 15% white carbon black, and kaolin makes up the balance;

[0046] Preparation method: The active ingredients, dispersants, wetting agents and fillers are mixed according to the formula ratio, uniformly stirred in a stirring kettle, and pulverized and mixed uniformly for multiple times by a jet mill to prepare the wettable powder of the composition of the present invention.

[0047] Indoor biological activity test

[0048] Example 1: Indoor activity test of the composite composition against Tetranychus urticae and Panonychus citri

[0049] Test basis: The test refers to NY / T 1154.12-2008 "Guidelines for Indoor Biological Activity Determination of Pesticides Insecticides Part 12: Spider Mite Slide Dipping Method".

[0050] Test targets: Two-spotted spider mite (Tetranychus urticae Koch), citrus mites (Panonychus citri Mcgregor).

[0051] Test agents: technical drug of the compound of formula I and technical drug of propargyl chlorpyrifos.

[0052] Test steps:

[0053] 1) Test material preparation: Select female adult mites that are raised indoors and have consistent physiological conditions.

[0054] Cut the double-sided tape into 2 cm long pieces and stick them on one end of the slide. Then select healthy female adult mites and stick their backs on the double-sided tape (do not stick the mite legs, antennae and mouthparts). Place 30 mites on each slide in a container lined with a wet sponge, cover it with a lid and place it at (25±1)℃. After 2 hours, perform microscopic examination, remove dead, injured and inactive individuals, and make up to 30 mites on each slide.

[0055] 2) Preparation of medicine: The original medicine is prepared into a mother solution with an organic solvent, and then 5 series of mass concentrations are prepared in equal proportions with a 0.1% Tween-80 aqueous solution.

[0056] 3) Chemical treatment: Immerse the glass slide in the chemical solution and shake it gently for 5 seconds, then take it out and absorb the excess chemical solution with absorbent paper. Place it on a white porcelain plate lined with a wet sponge and cover it with a light-transmitting plastic film.

[0057] Each treatment was repeated 4 times, and a treatment without drug (containing all organic solvents and emulsifiers) was set as a blank control.

[0058] 4) Feeding and observation

[0059] The container containing the treated test insects was placed at a temperature of (25±1)°C and a photoperiod of L:D=(16:8)h for breeding and observation.

[0060] 5) Inspection: Check the mortality of the test insects 48 hours after treatment and record the total number of insects and the number of dead insects respectively.

[0061] Data statistics and analysis:

[0062] Based on the survey data, the adjusted mortality rate of each treatment was calculated according to the following formula, and the calculation results were retained to two decimal places.

[0063]

[0064] Where:

[0065] P——mortality rate, in percentage (%);

[0066] K——indicates the number of dead insects, in units of heads;

[0067] N——represents the total number of insects treated, in heads.

[0068]

[0069] Where:

[0070] P1——adjusted mortality rate, in percentage (%);

[0071] P t ——Treatment mortality rate, expressed as percentage (%);

[0072] P0——blank control mortality rate, in percentage (%).

[0073] If the control mortality rate is less than 5%, no correction is required; if the control mortality rate is between 5% and 20%, correction should be made according to the correction mortality formula; if the control mortality rate is greater than 20%, the test needs to be repeated.

[0074] The DPS statistical analysis system was used to analyze the toxicity regression equation, correlation coefficient and LC 50 Value, to evaluate the activity of the test agent on the biological test material.

[0075] The co-toxicity coefficient (CTC value) of the mixture is calculated as follows:

[0076]

[0077] Where:

[0078] ATI——Actual Toxicity Index of Mixture;

[0079] S——LC of standard acaricide 50 , the unit is milligrams per liter (mg / L);

[0080] M——LC of the mixture 50 , the unit is milligrams per liter (mg / L).

[0081] TTI=TI A ×P A +TI B ×P B

[0082] Where:

[0083] TTI – Theoretical Toxicity Index of Mixtures;

[0084] TI A ——A: toxicity index of the agent;

[0085] P A ——The percentage of agent A in the mixture, in percentage (%);

[0086] TI B ——Toxicity index of agent B;

[0087] P B ——The percentage of agent B in the mixture, in percentage (%).

[0088]

[0089] Where:

[0090] CTC – Co-toxicity coefficient;

[0091] ATI——Actual Toxicity Index of Mixture;

[0092] TTI - Theoretical Toxicity Index of Mixture.

[0093] The co-toxicity coefficient of the combination CTC≥120 shows a synergistic effect; CTC≤80 shows an antagonistic effect; 80<CTC<120 shows an additive effect.

[0094] The indoor test results are shown in Table 1 and Table 2:

[0095] Table 1 Indoor biological activity test of compound I and cypermethrin combined with Tetranychus urticae

[0096] Test drug <![CDATA[LC 50 (mg / L)]]> (ATI) (TTI) Co-toxicity coefficient (CTC) Compounds of formula I 4.8471 100.000 / / Promethazine 317.664 1.526 / / 1:50 102.693 4.720 3.457 136.545 1:42 77.6799 6.240 3.816 163.520 1:24 51.9578 9.329 5.465 170.708 1:12 26.4226 18.345 9.101 201.571 1:6 16.0011 30.292 15.594 194.261 10:1 2.9312 165.362 91.048 181.621 20:1 3.0713 157.819 95.311 165.584 30:1 3.1947 151.723 96.823 156.701 35:1 3.4992 138.520 97.265 142.416 42:1 3.9938 121.366 97.710 124.210

[0097] It can be seen from Table 1 that the compound of formula I exhibits high toxicity to two-spotted spider mites, and the compound of formula I has a good control effect on two-spotted spider mites. The compound of formula I and chloranil do not show a synergistic effect on two-spotted spider mites in the range of 1:50 to 42:1, and the co-toxicity coefficient is greater than 130 in the range of 1:50 to 42:1, and the synergistic effect is significant.

[0098] Table 2 Indoor biological activity test of compound I combined with cypermethrin combined with Panonychus citri

[0099] Test drug <![CDATA[LC 50 (mg / L)]]> (ATI) (TTI) Co-toxicity coefficient (CTC) Compounds of formula I 3.1125 100.000 / / Promethazine 355.2489 0.876 / / 1:35 54.8772 5.672 3.630 156.264 1:20 34.3443 9.063 5.596 161.939 1:10 17.0796 18.223 9.887 184.310 10:1 1.9815 157.078 90.989 172.635 20:1 2.0266 153.582 95.280 161.191 30:1 2.3923 130.105 96.802 134.402

[0100] It can be seen from Table 2 that the compound of formula I exhibits a higher toxicity to Panonychus citri, and the combined action of the compound of formula I and chloranil in the range of 1:35 to 30:1 on Panonychus citri shows a synergistic effect.

[0101] Field efficacy test

[0102] Example 2: Field efficacy test of the composite composition for controlling red spider mites in cotton

[0103] Test basis: The test refers to GB / T 17980.74-2004 "Guidelines for Field Efficacy Tests of Pesticides (II) Part 74: Insecticides for Control of Cotton Red Spiders".

[0104] Experimental crops: cotton (Luyan cotton No. 15).

[0105] Test subject: Cotton spider mite.

[0106] Test agents: 55% compound of formula I·promex emulsifiable concentrate (1:10), 27% compound of formula I·promex microemulsion (1:8), 30% compound of formula I·promex wettable powder (5:1), 57% promex emulsifiable concentrate, 20% compound of formula I in aqueous emulsion.

[0108] Test area: The test site is Bairen Village, Yiyang Township, Feicheng City, Shandong Province. The soil in the test site is sandy loam with medium soil fertility.

[0109] Plot arrangement: The plots of experimental drugs, control drugs and blank control were arranged in random blocks, and 0.5m protection rows were set around each experimental plot and the experimental field. The area of ​​the experimental plot was 25m 2 , each treatment was repeated 4 times.

[0110] Application time and number of times: The experiment used conventional spraying method to apply pesticides once on June 10, 2020. The Gongnong-16 backpack sprayer was used to spray the whole cotton plant. The application was uniform and both sides of the leaves were sprayed. The application time was the early stage of cotton spider mites. No other pesticides for diseases, insect pests and weeds were used during the experiment.

[0111] Survey method: 30 leaves of each plant were marked for investigation, and the number of mites before treatment was no less than 500. The base number was investigated before the drug was used, and the number of live mites was investigated 1d, 3d, and 7d after the drug was used. The number of live and nymph mites on the 30 marked leaves was counted, and the mite population reduction rate and control effect were calculated.

[0112] Safety investigation: After applying the pesticide, investigate the cotton growth in each plot from time to time to observe whether any abnormal phenomena occur.

[0113] Calculation method of drug efficacy:

[0114]

[0115]

[0116] Table 3 Field efficacy test results of the composite composition for controlling cotton red spider mites

[0117]

[0118] As shown in the table above, the acaricidal composition of the present invention has a good control effect on cotton red spiders. 3 days after the application, the control effect of the acaricidal composition of the present invention is greater than 80%, showing good rapid effect compared with the control single agent; 14 days after the application, the control effects of 55% Formula I compound·Profenbendazole emulsifiable concentrate (1:10), 27% Formula I compound·Profenbendazole microemulsion (1:8), and 30% Formula I compound·Profenbendazole wettable powder (5:1) on cotton red spiders are 97.45%, 94.19%, and 91.02%, respectively.

[0119] Example 3: Investigation on the efficacy of the compound composition against citrus spider mites

[0120] The test was conducted with reference to the National Standard of the People's Republic of China "Guidelines for Field Efficacy Tests of Pesticides (I) Acaricides for Control of Panonychus citri".

[0121] Test target: Citrus spider mite.

[0122] Test location: The test was conducted in a citrus orchard in Dingshu Town, Yixing City, Jiangsu Province. The soil in the test site was yellow clay with medium to high soil fertility. The soil type, soil fertility, organic matter content, fertilizer and water, and farming management of the test orchard were basically the same. No acaricides or insecticides were applied in the test orchard 30 days before the test.

[0123] Experimental crop: Citrus (Red Beauty).

[0124] Test agents: 55% compound of formula I·promex emulsifiable concentrate (1:10), 27% compound of formula I·promex microemulsion (1:8), 30% compound of formula I·promex wettable powder (5:1), 57% promex emulsifiable concentrate, 20% compound of formula I in aqueous emulsion.

[0126] Experimental design: The experimental plot area consisted of 2 citrus trees and the experimental plots were arranged in randomized blocks with 4 replications for each treatment.

[0127] Test method: The test was conducted on June 14, 2021, using the spray method for pesticide application. The pesticide application equipment was a backpack automatic adjustment electric sprayer. When applying the pesticide, the front and back sides of the leaves were sprayed evenly until the pesticide liquid was about to drip.

[0128] Efficacy survey: Use the fixed-point survey method to survey the insect population before applying the pesticide, and survey once every 3d, 7d, and 14d after applying the pesticide. Survey 2 fruit trees in each plot, mark the tender shoots in the east, west, south, north, and center of each tree, conduct fixed-point surveys, survey 5 leaves in each direction, count the number of live mites on the front and back of the leaves, and survey a total of 50 leaves in each plot.

[0129] Calculation method of drug efficacy:

[0130]

[0131]

[0132] Direct impact on crops: After observation during the experiment, the above-mentioned agents had no adverse effects on the growth of citrus leaves, branches and fruits, and no phytotoxicity occurred, indicating that at this test dose, the test agent was relatively safe for citrus.

[0133] Table 4 Results of the investigation on the efficacy of the composite composition against citrus spider mites

[0134]

[0135]

[0136] It can be seen from the test results in the above table that the compound of formula I and chlorfenapyr are reasonably compounded to effectively control the damage of red spider mites. The acaricidal composition of the present invention has significant control effect, good rapid effect and long lasting effect compared with the control single agent.

[0137] Example 4: Safety test of compound composition on citrus

[0138] Experimental crops: Citrus (Satsuma mandarin).

[0139] Test location: The test was conducted in a citrus orchard in Yuanqiao Town, Huangyan District, Taizhou City, Zhejiang Province. The test crop was 5-year-old citrus trees, and the tree vigor of the test site was medium.

[0140] Test agents: 55% compound of formula I·propargyl emulsifiable concentrate (1:10), 27% compound of formula I·propargyl microemulsion (1:8), 57% propargyl emulsifiable concentrate, 20% compound of formula I aqueous emulsion.

[0141] Experimental arrangement: The plots of experimental agent, control agent and blank control were arranged in random blocks. Each experimental plot had an area of ​​2 citrus trees, with protective rows set up around them. Each treatment was repeated 4 times.

[0142] Application time and investigation time: The experiment was carried out during the spring shoot period of citrus. The temperature was 25℃, and the same amount of clean water was sprayed as a blank control. The Gongnong-16 backpack sprayer was used for application. The front and back sides of the leaves were evenly sprayed, and the liquid on the leaves was suspended without dripping. The damage of the young shoots of citrus in each treatment was investigated 3d and 14d after the application; the damage of the leaves was investigated 30 days after the application, and the damage of the leaves was graded.

[0143] Survey method: Two citrus trees were surveyed in each plot. The tender shoots were marked at the east, south, west, north and center of each tree. The leaves on one tender shoot were surveyed in each direction. A total of 10 tender shoots were surveyed for each treatment. The number of leaves on the surveyed tender shoots was recorded, the number of leaves at each level was counted, and the leaf color, branch color and leaf thickness of each treatment were compared.

[0144] The degree of damage is graded as follows:

[0145] Level 0: leaves are not damaged;

[0146] Level 1: The area of ​​damaged spots on leaves accounts for less than 1 / 4 of the leaf area;

[0147] Level 2: The affected area accounts for 1 / 4 to 1 / 2 of the leaf area;

[0148] Level 3: The affected spots account for 1 / 2 to 3 / 4 of the leaf area;

[0149] Level 4: The affected spots account for more than 3 / 4 of the leaf area.

[0150] Key grading table

[0151] The leaf damage index was calculated according to the following formula:

[0152]

[0153] The test results are shown in the following table:

[0154] Table 5 Safety test results of compound composition on citrus

[0155]

[0156] From the safety test results in the above table, it can be seen that the use of 57% propantheil emulsifiable concentrate in the spring shoot and tender leaf stage causes phytotoxicity to the tender leaves. The symptoms are the appearance of round or irregular yellow-brown marks on the back of the tender leaves, and the uneven surface of the leaves. When the damage is serious, the tender leaves shrink and become hard and brittle. The acaricidal composition of the present invention is safe for citrus.

[0157] It can be seen from the results of indoor toxicity tests and field efficacy tests that compounding the compound of formula I with chlorfenapyr in a suitable ratio can significantly improve the efficacy, have a good control effect on crop pests, and is safe for the test crops.

[0158] It should be understood that the above embodiments are only some embodiments of the present invention, and are provided only for a better understanding of 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 in the present invention and the composition mode between the components, different and countless embodiments can be obtained, which are all within the scope of the present invention.

Claims

1. A mite-killing composition containing propargyl, characterized in that: The acaricidal composition comprises active ingredient A and active ingredient B, wherein the active ingredient A is a compound of formula I: (Formula I), the active ingredient B is propargyl.

2. The acaricidal composition according to claim 1, characterized in that The mass ratio of the active ingredient A to the active ingredient B is 1:42 to 35:

1.

3. The acaricidal composition according to claim 1, characterized in that The mass ratio of the active ingredient A to the active ingredient B is 1:35 to 30:

1.

4. The acaricidal composition according to claim 1, characterized in that The total weight of the acaricidal combination is 100 wt%, and the total weight of the active ingredient A and the active ingredient B accounts for 1% to 80% of the total weight of the acaricidal composition.

5. The acaricidal composition according to claim 1, characterized in that In addition to the active ingredient, the acaricidal composition also contains auxiliary ingredients permitted in pesticides, wherein the auxiliary ingredients are selected from one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoaming agents, solvents, preservatives, stabilizers, synergists or carriers.

6. The acaricidal composition according to claim 1, characterized in that The acaricidal composition can be prepared into any formulation permitted by pesticides, and the formulation can be a solid formulation or a liquid formulation; The solid preparations include powders, granules, pellets, tablets, strips, wettable powders, oil-dispersible powders, emulsion powders, water-dispersible granules, emulsion granules, water-dispersible tablets, soluble powders, soluble tablets or soluble granules; The liquid preparations include soluble solutions, soluble gels, oils, film-spreading oils, emulsifiable concentrates, latexes, dispersible solutions, ointments, aqueous emulsions, oil emulsions, microemulsions, lipid suspensions, microcapsule suspensions, oil suspensions, dispersible oil suspensions, suspoemulsions, microcapsule suspension-suspension concentrates, microcapsule suspension-water emulsions or microcapsule suspension-suspoemulsions.

7. The acaricidal composition according to claim 6, characterized in that The preparation dosage form is emulsifiable concentrate, microemulsion, aqueous emulsion, wettable powder or water-dispersible granules.

8. Use of the acaricidal composition according to any one of claims 1 to 7 for controlling plant pests.

9. The use according to claim 8, characterized in that The plant pest mites are pest mites of the Tetranychus family or the Acaridae family.

10. The use according to claim 9, characterized in that The pest mites of the Tetranychidae family are two-spotted spider mites, cinnabarinus spider mites, citrus panonychus mite, citrus eotetranychus, six-spotted eotetranychus, citrus split-nail mite or truncate spider mite, and the pest mites of the Gall Mites family are citrus rust mite and wolfberry gall mite.

Images