Pesticide composition and application thereof

Abstract

The invention belongs to the technical field of pesticide disinfestation, and discloses a pesticide composition and application thereof.The pesticide composition comprises an active component A and an active component B. The active component A is dicloromezotiaz, the active component B is one of a compound shown in the formula I and # imgabs 0 # or a compound shown in the formula II and # imgabs 1 #, and the mass ratio of the active component A to the active component B is 1: 80-80: 1. The pesticide composition provided by the invention can effectively overcome the drug resistance of pests to a single agent through action mechanism complementation, has a remarkable synergistic effect, has a wider control spectrum and persistence, and can reduce the field management cost.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticide killing technology and discloses a pesticide composition and application thereof. Background Art

[0002] Dimpropyridaz is a pyrazoleamide insecticide developed by BASF with a novel mechanism of action. It is mainly used for fruit trees and vegetables, field crops such as soybeans, cotton, cereals, potatoes, as well as flowers and ornamental plants. It controls pests such as Lepidoptera, Coleoptera, Diptera (flies, mosquitoes, vegetable leafminers, etc.), Hemiptera, and Thysanoptera. It is especially effective against piercing-sucking pests such as aphids, whiteflies, and psyllids.

[0003] Chemical methods for pest control have the advantages of high efficiency, rapidity, simple operation, and low cost. They can quickly control the spread of pests by poisoning, inhibiting or interfering with the physiological metabolism of pests, especially in the event of large-scale outbreaks, and can achieve emergency control. Its broad spectrum can act on a variety of pests at the same time, and the formulations of the agents are diverse (such as spraying, fumigation, etc.) to meet the needs of different scenarios. However, this method also has significant disadvantages: environmental pollution (pesticide residues pollute the soil, water sources and food chain), the development of drug resistance (long-term use leads to increased adaptability of pests), non-target biological damage (accidental killing of beneficial insects and natural enemies, destroying the ecological balance), and residual hazards (threatening human health). Therefore, it is necessary to scientifically select low-toxic and high-efficiency agents and standardize their application to balance the control effect with environmental sustainability. Summary of the Invention

[0004] To address the above problems, the present invention scientifically combines dimpropyridaz with any one of the compounds of formula I and formula II with different mechanisms of action, screens for targets for effective control and selects a reasonable compound ratio. This can significantly enhance control efficacy, expand the insecticide spectrum, delay drug resistance, and reduce the probability of single resistance development in pests through multi-target effects; it also reduces costs, reflecting the comprehensive advantages of scientific drug use.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: a pesticide composition, the pesticide composition comprising active ingredient A and active ingredient B, the active ingredient A is dicloromezotiaz, and the active ingredient B is a compound of formula I: Or a compound of formula II: One of the above, wherein the mass ratio of the active ingredient A to the active ingredient B is 80:1 to 1:80.

[0006] Furthermore, the active ingredient B is a compound of formula I, and the mass ratio of the active ingredient A to the active ingredient B is 1:50 to 40:1, or any value within the above numerical range.

[0007] Furthermore, the active ingredient B is a compound of formula II, and the mass ratio of the active ingredient A to the active ingredient B is 1:40 to 60:1, or any value within the above numerical range.

[0008] Furthermore, the active ingredient B is a compound of formula I, and the mass ratio of the active ingredient A to the active ingredient B is 1:50 to 20:1, or any value within the above numerical range;

[0009] Furthermore, the active ingredient B is a compound of formula I, and the mass ratio of the active ingredient A to the active ingredient B is 1:35 to 20:1, or any value within the above numerical range.

[0010] Furthermore, the active ingredient B is a compound of formula II, and the mass ratio of the active ingredient A to the active ingredient B is 1:22 to 40:1, or any value within the above numerical range.

[0011] Furthermore, the pesticide composition contains pesticide-acceptable auxiliary ingredients in addition to the active ingredients, 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.

[0012] Furthermore, the pesticide composition is prepared as a solid preparation or a liquid preparation.

[0013] Furthermore, the solid preparation is a water-dispersible granule or a wettable powder; the liquid preparation is a suspension, an emulsifiable concentrate, an aqueous emulsion, a microemulsion, or a dispersible oil suspension.

[0014] The present invention also discloses use of the above pesticide composition for preventing and controlling crop pests.

[0015] Furthermore, the pests are Lepidoptera pests or Hemiptera pests;

[0016] Furthermore, the lepidopteran pests are beet armyworm, diamondback moth, cabbage looper, and rice stem borer; and the hemiptera pests are rice planthoppers.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1) The pesticide composition of the present invention is rationally compounded by insecticides with different mechanisms of action to produce synergistic effects on multiple target pests;

[0019] 2) The inventive composition of the present invention expands the insecticidal spectrum, can cover pests of different purposes and delay the development of drug resistance. DETAILED DESCRIPTION

[0020] In order to better understand the essence of the present invention, the contents of the present invention are further illustrated below in conjunction with the examples, but they cannot be regarded as limiting the present invention. The contents mentioned in the examples are not limitations of the present invention, and the selection of material formulas can be adapted to local conditions without substantial impact on the results.

[0021] Preparation method:

[0022] 1. Preparation method of suspension concentrate: according to the formula ratio, the active ingredient, surfactant and other functional additives are placed in the reactor in sequence, water is added and mixed evenly, and the suspension concentrate product is obtained by high-speed shearing, wet sand grinding, and finally homogenization filtration.

[0023] 2. Preparation method of emulsifiable concentrate: According to the formula ratio, the measured active ingredient, solvent and cosolvent are added to a mixing kettle and stirred to dissolve them, and then an emulsifier is added, and the balance is supplemented with the remaining solvent. The mixture is stirred evenly in a stirred kettle and filtered to obtain the desired emulsifiable concentrate of the present invention.

[0024] 3. Preparation method of dispersible oil suspension: according to the formula ratio, the active ingredients, surfactants and other functional additives are placed in the reactor in sequence, oil is added and mixed evenly, and the dispersible oil suspension product is obtained by high-speed shearing, wet sand grinding, and finally homogenization filtration.

[0025] 4. Preparation of water-dispersible granules: According to the formula ratio of the embodiment, the active ingredient is added to the carrier, and a surfactant and other functional additives are added thereto, mixed, and after air flow grinding, 10-25% water is added, and then the mixture is kneaded, granulated, dried, and sieved to obtain a water-dispersible granule product; or the pulverized powder is sprayed with water in a boiling granulator, granulated, dried, and then sieved to obtain the product.

[0026] 5. Preparation method of wettable powder: According to the formula ratio, the active ingredient, dispersant, wetting agent and filler are mixed, stirred evenly in a mixer, crushed in a jet mill and mixed evenly again to prepare the wettable powder of the composition of the present invention.

[0027] Preparation example:

[0028] Preparation Example 1: 22% dimpropyridaz·Formula I compound suspension (10:1)

[0029] Formula composition: 20% dimpropyridaz, 2% compound of formula I, 2% calcium dodecylbenzenesulfonate, 1% sodium alkyl polyoxyethylene ether sulfonate, 3% fatty alcohol polyoxyethylene ether phosphate, 0.25% xanthan gum, 1% magnesium aluminum silicate, 5% ethylene glycol, 0.1% isothiazolinone, 0.5% silicone oil, and deionized water to make up the balance;

[0030] Preparation Example 2: 22% dimpropyridaz·Formula II compound suspension (10:1)

[0031] Formula composition: 20% dimpropyridaz, 2% compound of formula II, 0.5% alkyl aryl polyoxyethylene ether polyoxypropylene ether, 4% castor oil polyoxyethylene ether phosphate, 2% polycarboxylic acid sodium salt, 0.25% xanthan gum, 4% ethylene glycol, 0.1% potassium benzoate, 0.5% silicone oil, and deionized water makes up the balance.

[0032] Preparation Example 3: 15% dimpropyridaz·Formula I compound emulsifiable concentrate (1:1)

[0033] Formula composition: 7.5% dimpropyridaz, 7.5% compound of formula I, 15% DMF, 15% glycerol fatty acid ester polyoxyethylene ether, 2% sodium lauryl sulfate, 25% fatty alcohol polyoxyethylene ether phosphate, and xylene makes up the balance.

[0034] Preparation Example 4: 11% dimpropyridaz·Formula II compound emulsifiable concentrate (1:10)

[0035] Formula composition: 1% dimpropyridaz, 10% compound of formula II, 12% EO / PO block copolymer, 13% acetophenone, 15% N-octylpyrrolidone, 2% succinate sulfonate, and trimethylbenzene makes up the balance.

[0036] Preparation Example 5: 18% dimpropyridaz·Formula I compound dispersible oil suspension (1:2)

[0037] The formula comprises: 6% dimpropyridaz, 12% compound of formula I, 2% sodium lauryl sulfate, 12% isomeric tridecyl alcohol polyoxyethylene ether, 3% Guerbet alcohol polyoxyethylene ether, 1% silicon dioxide, 1% organic bentonite, 15% 200# solvent oil, and methyl oleate making up the balance.

[0038] Preparation Example 6: 12% dimpropyridaz·Formula II compound dispersible oil suspension (5:1)

[0039] The formula comprises: 10% dimpropyridaz, 2% compound of formula II, 5% alkylaryl polyoxyethylene ether polyoxypropylene ether, 10% styrylphenol polyoxyethylene ether, 1% sodium lauryl sulfate, 2% sodium salt of polycarboxylate, 1% naphthalenesulfonate formaldehyde condensate, and the balance is made up of soybean oil.

[0040] Preparation Example 7: 24% dimpropyridaz·Formula I compound water dispersible granules (1:5)

[0041] The formula comprises: 4% dimpropyridaz, 20% compound of formula I, 10% lignin sulfonate, 5% calcium dodecylbenzenesulfonate, 2% succinate sulfonate, 5% white carbon black, 25% starch, and kaolin makes up the balance.

[0042] Preparation Example 8: 32% dimpropyridaz·Formula II compound water dispersible granules (15:1)

[0043] Formula composition: 30% dimpropyridaz, 2% compound of formula II, 10% sodium salt of polycarboxylate, 3% flaking powder BX, 2% sodium dodecylbenzenesulfonate, 5% white sugar, and kaolin makes up the balance.

[0044] Preparation Example 9: 33% dimpropyridaz·Formula I compound wettable powder (1:10)

[0045] The formula comprises: 3% dimpropyridaz, 30% compound of formula I, 5% sodium lignin sulfonate, 2% sodium alkyl polyoxyethylene ether sulfonate, 2% opening powder BX, 5% white carbon black, and kaolin making up the balance.

[0046] Preparation Example 10: 21% dimpropyridaz·Formula II compound wettable powder (1:20)

[0047] The formula comprises: 1% dimpropyridaz, 20% compound of formula II, 2% sodium lauryl sulfate, 4% sodium lignin sulfonate, 5% sodium octylphenol polyoxyethylene ether sulfonate, 8% kaolin, 10% white carbon black, and the balance is made up of bentonite.

[0048] Example 1: Indoor bioactivity test on lepidopteran pests Plutella xylostella and Spodoptera exigua

[0049] Test reference: NY / T 1154.6-2006 "Guidelines for Indoor Biological Tests of Pesticides - Insecticides Part 6: Insecticide Activity Test - Immersion Method".

[0050] Test targets: 3rd instar larvae of diamondback moth and beet armyworm. Target insects with the same physiological state were selected for this test.

[0051] Instruments and equipment: electronic balance, insect immersion cage, volumetric flask, culture dish, beaker, pipette, tweezers, filter paper, marker pen, stopwatch.

[0052] Test agents: dimpropyridaz, compound of formula I, and technical version of compound of formula II;

[0053] Preparation: Dissolve the test drug in a suitable solvent and then dilute with 0.1% Tween 80 aqueous solution. Five concentration series are set according to the activity of the drug using the proportional method.

[0054] Chemical treatment: Immerse the test insects in the chemical solution for 5 seconds, then remove excess solution with filter paper and transfer the insects to normal rearing conditions. Each treatment was repeated four times, with 20 insects immersed in each repetition. A control treatment containing the corresponding organic solvent without the chemical was also included.

[0055] Investigation: Investigate the mortality of test insects 48 hours after treatment and record the total number of insects and the number of dead insects.

[0056] Calculation method:

[0057] Based on the survey data, calculate the mortality rate of each treatment. Calculate as follows:

[0058]

[0059] Where:

[0060] P——mortality rate, in percentage (%);

[0061] K——indicates the number of dead insects, the unit is head;

[0062] N——represents the total number of insects processed, in heads.

[0063]

[0064] Where:

[0065] P1——adjusted mortality rate, in percentage (%);

[0066] P t ——Treatment mortality rate, expressed in percentage (%);

[0067] P0 - blank control mortality rate, in percentage (%).

[0068] 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.

[0069] The DPS statistical analysis system was used to analyze the toxicity regression equation, correlation coefficient and LC 50 The activity of the test agent on the biological test material is evaluated by the value.

[0070] The co-toxicity coefficient (CTC value) of the mixture is calculated as follows:

[0071]

[0072] Where:

[0073] ATI - measured toxicity index of mixture;

[0074] S——LC of standard pesticide 50 , the unit is milligrams per liter (mg / L);

[0075] M——LC of the mixture 50 , the unit is milligrams per liter (mg / L).

[0076] TTI=TI A ×P A +TI B ×P B

[0077] Where:

[0078] TTI – Theoretical Toxicity Index of Mixtures;

[0079] TI A ——Agent toxicity index;

[0080] P A ——The percentage of agent A in the mixture, in percentage (%);

[0081] TI B ——Toxicity index of agent B;

[0082] P B ——The percentage of agent B in the mixture, in percentage (%).

[0083]

[0084] Where:

[0085] CTC – Co-toxicity coefficient;

[0086] ATI - measured toxicity index of mixture;

[0087] TTI - Theoretical Toxicity Index of Mixture.

[0088] A co-toxicity coefficient (CTC) of 120 or higher indicates a synergistic effect; a co-toxicity coefficient (CTC) of 80 or lower indicates an antagonistic effect; and a co-toxicity coefficient (CTC) of 80 or lower indicates an additive effect.

[0089] The indoor test results are shown in the table below:

[0090] Table 1 Results of indoor biological activity test on Plutella xylostella with the combination of dimpropyridaz and compounds of formula I

[0091]

[0092]

[0093] Indoor biological activity tests revealed that combining dimpropyridaz with the compound of Formula I in a reasonable ratio demonstrated excellent control efficacy against Plutella xylostella. The co-toxicity coefficient (CTC) was greater than 120 at a mass ratio of 1:20 to 40:1, indicating a synergistic effect. The CTC reached a maximum of 156.435 at a mass ratio of 20:1.

[0094] Table 2 Results of indoor biological activity test of dimpropyridaz and compound of formula I against Spodoptera exigua

[0095]

[0096] Indoor biological activity tests showed that combining dimpropyridaz with the compound of Formula I in a reasonable ratio demonstrated effective control against Spodoptera exigua. The co-toxicity coefficient (CTC) was greater than 120 at a mass ratio of 1:35 to 20:1, indicating a synergistic effect. The CTC reached a maximum of 208.933 at a mass ratio of 1:1.

[0097] Table 3 Results of indoor biological activity test on Plutella xylostella with the combination of dimpropyridaz and compound of formula II

[0098]

[0099]

[0100] Indoor biological activity tests revealed that combining dimpropyridaz with the compound of Formula II in a reasonable ratio demonstrated excellent control efficacy against Plutella xylostella. At a mass ratio of 1:40 to 60:1, the co-toxicity coefficient (CTC) was greater than 120, indicating a synergistic effect. At a CTC of 10:1, the CTC reached a maximum of 170.666.

[0101] Table 4 Results of indoor biological activity test of dimpropyridaz and compound of formula II against Spodoptera exigua

[0102]

[0103] Indoor biological activity tests showed that combining dimpropyridaz with the compound of Formula II in a reasonable ratio demonstrated effective control against Spodoptera exigua. The co-toxicity coefficient (CTC) was greater than 120 at a mass ratio of 1:22 to 40:1, indicating a synergistic effect. The CTC reached a maximum of 259.329 at a mass ratio of 8:1.

[0104] Example 2: Indoor bioactivity test on rice planthoppers

[0105] Test target: Brown planthopper (Nilaparvata lugens), 3rd instar nymph.

[0106] Test agents: dimpropyridaz, the original drug of the compound of formula I; the test agent was dissolved in a suitable solvent to prepare a mother solution of a certain concentration, and then the mother solution was diluted with a 0.1% Tween-80 aqueous solution to a series of 5 solutions.

[0107] Test method: The pressure of the Potter spray tower was stabilized at 1.47×10 5 Pa, the spray head is first cleaned twice with acetone, and then cleaned twice with distilled water. Use a brush to select 40 test insects with the same physiological state and put them into a culture dish. Then place the culture dish on the bottom plate of the Potter spray tower for quantitative spraying. The spray volume is 1mL. The liquid is taken out after settling for 1 minute. Each treatment is repeated 4 times. A 0.1% Tween-80 aqueous solution is used as a blank control. The treated test insects are then placed in an intelligent artificial climate box with a temperature of (25±1)℃, a relative humidity of 60% to 80%, and a light cycle of 16L:8D for culture. Check for death after 48 hours. Use a No. 0 brush to lightly touch the insect body. Those that are completely motionless are considered dead.

[0108] Calculation method:

[0109] Based on the survey data, calculate the mortality rate of each treatment. Calculate as follows:

[0110]

[0111] Where:

[0112] P——mortality rate, in percentage (%);

[0113] K——indicates the number of dead insects, the unit is head;

[0114] N——represents the total number of insects processed, in heads.

[0115]

[0116] Where:

[0117] P1——adjusted mortality rate, in percentage (%);

[0118] P t ——Treatment mortality rate, expressed in percentage (%);

[0119] P0 - blank control mortality rate, in percentage (%).

[0120] 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.

[0121] The DPS statistical analysis system was used to analyze the toxicity regression equation, correlation coefficient and LC 50 The activity of the test agent on the biological test material is evaluated by the value.

[0122] The co-toxicity coefficient (CTC value) of the mixture is calculated as follows:

[0123]

[0124] Where:

[0125] ATI - measured toxicity index of mixture;

[0126] S——LC of standard pesticide 50 , the unit is milligrams per liter (mg / L);

[0127] M——LC of the mixture 50 , the unit is milligrams per liter (mg / L).

[0128] TTI=TI A ×P A +TI B ×P B

[0129] Where:

[0130] TTI – Theoretical Toxicity Index of Mixtures;

[0131] TI A ——Agent toxicity index;

[0132] P A ——The percentage of agent A in the mixture, in percentage (%);

[0133] TI B ——Toxicity index of agent B;

[0134] P B ——The percentage of agent B in the mixture, in percentage (%).

[0135]

[0136] Where:

[0137] CTC – Co-toxicity coefficient;

[0138] ATI - measured toxicity index of mixture;

[0139] TTI - Theoretical Toxicity Index of Mixture.

[0140] A co-toxicity coefficient (CTC) of ≥120 indicates a synergistic effect; a CTC of ≤80 indicates an antagonistic effect; and a CTC of 80 < CTC <120 indicates an additive effect. The results of the laboratory test are shown in the table below:

[0141] Table 5 Results of indoor biological activity test of dimpropyridaz and compound of formula I against rice planthoppers

[0142]

[0143] Indoor biological activity tests revealed that combining dimpropyridaz with the compound of Formula I in a reasonable ratio demonstrated excellent control efficacy against rice planthoppers. The co-toxicity coefficient (CTC) was greater than 120 at a mass ratio of 1:50 to 20:1, indicating a synergistic effect. The CTC reached a maximum of 189.349 at a mass ratio of 1:5.

[0144] Example 3: Field efficacy test for controlling diamondback moth and beet armyworm

[0145] Test location: The test was conducted in Xujiabu Village, Shengzhuang Town, Taishan District, Tai'an City, Shandong Province. The soil fertility of the test site is medium to high, the terrain is flat, the irrigation conditions are good, the cultivation conditions of the test area are consistent, and the pest occurrence is moderate.

[0146] Targets of control: Diamondback moth and beet armyworm.

[0147] Experimental design: plot area 20m 2 , repeated 4 times, and arranged in random blocks.

[0148] Test method: At the early stage of pest outbreak, use HM-16A backpack electric sprayer at 900kg / hm 2 Spray evenly on the front and back of the cabbage leaves with a volume of the solution. Investigate the base insect population before application and investigate control effectiveness 3 and 10 days after application. Use a random sampling method of 5 points, marking 4 plants at each point. Then, select 20 plants in each plot to investigate the number of live insects. Calculate the insect population reduction rate and control effectiveness.

[0149] The efficacy calculation method is as follows:

[0150]

[0151] The results of the field efficacy test are shown in the following table:

[0152] Table 6 Results of field efficacy tests on Plutella xylostella and Spodoptera exigua

[0153]

[0154] As shown in Table 6, the combination of dimpropyridaz and the compound of formula I has a good control effect on cabbage beet armyworm and diamondback moth. 2 The control efficacy against cabbage beet armyworm was 88.37% to 94.66%. Ten days after application, the field control efficacy of the 24% dimpropyridaz·Formula I compound water dispersible granules (1:5) of Preparation Example 7, the 18% dimpropyridaz·Formula I compound dispersible oil suspension (1:2) of Preparation Example 5, and the 15% dimpropyridaz·Formula I compound emulsifiable concentrate (1:1) of Preparation Example 3 against the beet armyworm and diamondback moth was 92.66%, 95.83%, and 98.85%, respectively, significantly higher than the control efficacy of the single-dose control against the pests.

[0155] Example 4: Field efficacy test for controlling beet armyworm

[0156] The trial was conducted in a cabbage field in Xizhai Village, Xiangquan Town, He County, Ma'anshan City, Anhui Province. The soil in the experimental plots was medium fertility, loamy, and had a pH of 6.8. During the trial, cultivation and water and fertilizer management remained consistent across all plots, meeting the requirements of agricultural production practices.

[0157] Experimental crop: Cabbage.

[0158] Test target: Beet armyworm.

[0159] Experimental design: This experiment has 6 treatments, 4 replicates for each treatment, and 24 plots in total, arranged in random blocks, with a plot area of ​​30m 2 .

[0160] Test Method: The pesticide was applied when cabbage was in the rosette stage and beet armyworms were in their early larval stages. The pesticide was prepared using a secondary dilution method to produce solutions of varying treatment concentrations. Application was then made once using a Guardian NS-16 manual sprayer (operating pressure 0.15-0.40 MPa, spray hole diameter 0.9 mm). The control plot was sprayed with an equal amount of water. Throughout the trial, all other field management procedures were routine for each treatment.

[0161] Efficacy survey: The test used a fixed-point, fixed-plant method. Three sites were selected for each treatment, with 10 plants fixed at each site. The base insect population was surveyed before application, and the number of remaining insects was surveyed 3 and 7 days after application. The insect population reduction rate and control efficacy were calculated.

[0162] The relevant calculation formula is as follows:

[0163]

[0164] Table 7 Results of field efficacy test on control of beet armyworm

[0165]

[0166] The results of the field efficacy test showed that the reasonable combination of dimpropyridaz and the compound of formula II had a high field control effect on beet armyworm. 2 The control efficacy was significantly higher than that of the single-dose control. Seven days after application, the control efficacy of Preparation Example 2, a 22% dimpropyridaz·Formula II compound suspension concentrate (10:1), remained above 95%, comparable to that of Preparation Example 8, a 32% dimpropyridaz·Formula II compound water-dispersible granules (15:1) at the same dose, and higher than that of Preparation Example 4, a 11% dimpropyridaz·Formula II compound emulsifiable concentrate (1:10). The control efficacy of the combined preparations was significantly higher than that of 25% Formula II compound water-dispersible granules and 20% dimpropyridaz suspension concentrate.

[0167] Example 5: Field efficacy test for controlling rice planthoppers

[0168] Test location: The test was conducted in the rice fields of Youyi Village, Yisuhe Town, Xiangtan County, Xiangtan City, Hunan Province. The test site was yellow mud with medium soil fertility.

[0169] Experimental crops: Rice (Taiyou 390).

[0170] Experimental design: This experiment has 6 treatments, each with 4 replicates, and the plot area is 30m 2 , arranged in random block groups, with external protection rows, and ridges built between cells to ensure independent drainage and irrigation for each cell.

[0171] Test method: The pesticide was sprayed using a Xiangfeng 3WBD-16 electric backpack sprayer with a water consumption of 450 kg / hm2. 2 At the end of rice tillering, when the young nymphs of rice planthoppers are beginning to emerge, spray the base of rice stems and leaves evenly once, using 750L / hm2 of water. 2 After applying the pesticide, keep a 3-5 cm deep water layer in the rice field. Do not use other pesticides to control rice planthoppers during the application period.

[0172] Survey Method: Survey the base population before application. Survey the number of surviving rice planthoppers 1, 3, and 7 days after application. Sample 10 points per plot using the parallel jump method, surveying two rice clumps at each point. Calculate control efficacy based on the reduction in rice planthopper populations in the treatment and blank control plots.

[0173] The efficacy calculation method is as follows:

[0174]

[0175] The results of the field efficacy test are shown in the following table:

[0176] Table 8 Results of field trials on the efficacy of pesticides for controlling rice planthoppers

[0177]

[0178] From an overall analysis, the three tested agents, Preparation Example 1: 22% dimpropyridaz·Formula I compound suspension (10:1), Preparation Example 5: 18% dimpropyridaz·Formula I compound dispersible oil suspension (1:2), Preparation Example 7: 24% dimpropyridaz·Formula I compound water-dispersible granules (1:5), had higher overall protective efficacy.

Claims

1. A pesticide composition, characterized in that The pesticide composition comprises active ingredient A and active ingredient B, wherein the active ingredient A is dicloromezotiaz and the active ingredient B is a compound of formula I: Or a compound of formula II: One of the above, wherein the mass ratio of the active ingredient A to the active ingredient B is 1:80 to 80:

1.

2. The pesticide composition according to claim 1, characterized in that The active ingredient B is a compound of formula I, and the mass ratio of the active ingredient A to the active ingredient B is 1:50 to 40:

1.

3. The pesticide composition according to claim 1, characterized in that The active ingredient B is a compound of formula II, and the mass ratio of the active ingredient A to the active ingredient B is 1:40 to 60:

1.

4. The pesticide composition according to claim 2, characterized in that The active ingredient B is a compound of formula I, and the mass ratio of the active ingredient A to the active ingredient B is 1:50 to 20:1, preferably 1:35 to 20:

1.

5. The pesticide composition according to claim 3, characterized in that The active ingredient B is a compound of formula II, and the mass ratio of the active ingredient A to the active ingredient B is 1:22 to 40:

1.

6. The pesticide composition according to claim 1, characterized in that In addition to the active ingredients, the pesticide composition also contains auxiliary ingredients acceptable to 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.

7. The pesticide composition according to claim 1, characterized in that The pesticide composition is prepared into a solid preparation or a liquid preparation.

8. The pesticide composition according to claim 7, characterized in that The solid preparations are water-dispersible granules and wettable powders; the liquid preparations are suspensions, emulsifiable concentrates, aqueous emulsions, microemulsions, and dispersible oil suspensions.

9. Use of the pesticide composition according to any one of claims 1 to 8 for controlling crop pests.

10. The use according to claim 9, characterized in that The pests are Lepidoptera pests or Hemiptera pests; The lepidopteran pests are beet armyworm, diamondback moth, cabbage looper and rice stem borer; the hemiptera pests are rice planthopper.

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