Pyroxasulfone and topramezone compounded weeding composition and application thereof

Abstract

The invention belongs to the technical field of agricultural weeding compositions, and particularly relates to a pyroxasulfone and topramezone compounded weeding composition and application thereof. Comprising pyroxasulfone and topramezone, and the weight ratio of pyroxasulfone to topramezone is 1: (0.2-5). The weeding composition has the advantages of low resistance risk, low cost, long pesticide effect and small environmental pollution. The invention also provides application of the weeding composition in prevention and control of weeds in corn fields.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural herbicidal compositions, and particularly relates to a herbicidal composition compounded with pyraclostrobin and benomyl and an application thereof. Background Art

[0002] Sulfonepyrazoline is a new soil treatment agent developed by Kumizu Chemical Co., Ltd. in 2002. It has high biological activity against annual grass weeds and broadleaf weeds and is a new type of pyrazole selective herbicide. Chemical name: 3-(5-(difluoromethoxy)-1-methyl-3-trifluoromethylpyrazole-4-methylsulfonyl)-4,5-2H-5,5-dimethyl-1,2-oxazole; molecular formula: C 12 H 14 F 5 N 3 O 4 S, the structural formula is as follows:

[0003]

[0004] Weeds treated with sulfonepyraclostrobin can greatly reduce the biosynthesis of very long chain fatty acids (VLCFAs) and cause the construction of fatty acid precursors. Sulfonepyraclostrobin can specifically inhibit many extension steps catalyzed by VLCFAs elongase. It is characterized by high activity, 8 to 10 times lower dosage than classic soil treatment agent chloroacetamide herbicides, longer lasting effect, stronger compatibility, and lower toxicity to most organisms. In the future, it may replace chloroacetamide herbicides and become a new trend in soil treatment agents.

[0005] Benzophenone is a triazine herbicide, with the chemical name [3-(4,5-dihydro-3-isoxazolyl)-2-methyl-4-(methylsulfonyl)phenyl](5-hydroxy-1-methyl-1H-pyrazol-4-yl)methanone, and the structural formula is as follows:

[0006]

[0007] Benthiocarb is a new type of pyrazolone post-emergence stem and leaf treatment systemic herbicide. It is a triketone and HPPD inhibitor with systemic conduction and can be absorbed by the leaves, roots and stems of plants. It is safe for corn, sweet corn, glutinous corn and popcorn, and is the cornfield herbicide with the least toxicity to mammals. The single active ingredient has a simple mechanism of action, and plants develop resistance quickly. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides a herbicidal composition of pyraclostrobin and fenpyrazone, which has low resistance risk, low cost, long drug effect and low environmental pollution. The present invention also provides its application in corn field weed control.

[0009] The herbicidal composition of pyraclostrobin and benomyl compound of the present invention comprises pyraclostrobin and benomyl, wherein pyraclostrobin and benomyl are the active ingredients of the herbicidal composition.

[0010] Preferably, the weight ratio of sulfonepyraclostrobin to benzathine is 1:(0.2-5), more preferably 1:(1-3).

[0011] Preferably, the weight percentage of pyraclostrobin and fenpyrazone in the composition is 5% to 60%, more preferably 12% to 30%.

[0012] Preferably, the pesticide preparation further comprises auxiliary components, which include carriers and adjuvants.

[0013] Preferably, the carrier is one or more of water, solvent and filler, wherein the water is preferably deionized water.

[0014] Preferably, the solvent is selected from one or more of N,N-dimethylformamide (DMF), S-150# (tetramethylbenzene), cyclohexanone, acetone, toluene, xylene, dimethyl sulfoxide, methanol, ethanol, trimethylcyclohexanone, N-octylpyrrolidone, ethanolamine, triethanolamine, isopropylamine, N-methylpyrrolidone, propanol, butanol, ethylene glycol, diethylene glycol, ethylene glycol methyl ether, butyl ether, ethanolamine, isopropylamine, ethyl acetate and acetonitrile.

[0015] Preferably, the filler is a solid filler or a liquid filler; the solid filler is selected from one or more of kaolin, diatomaceous earth, bentonite, attapulgite, white carbon black, starch and light calcium carbonate; the liquid filler is also called an oil phase carrier, selected from one or more of methyl oleate, soybean oil, corn oil and mineral oil.

[0016] Preferably, the auxiliary agent comprises a surfactant, and the surfactant is selected from one or more of an emulsifier, a dispersant, a wetting agent and a penetrant.

[0017] Preferably, the auxiliary agent also includes one or more of an antifreeze agent, a thickener, a stabilizer, a disintegrant, and a defoaming agent.

[0018] Preferably, the emulsifier is selected from Nongru 500# (calcium alkylbenzene sulfonate), OP series phosphate (nonylphenol polyoxyethylene ether phosphate), Nongru 600# (phenylphenol polyoxyethylene ether phosphate), Nongru 604# (phenylethylphenol polyoxyethylene ether), styrene polyoxyethylene ether ammonium sulfate, alkyl biphenyl ether disulfonic acid magnesium salt, triethanolamine salt, Nongru 400# (benzyl dimethylphenol polyoxyethyl ether), Nongru 700# (alkylphenol formaldehyde resin polyoxyethyl ether), Nongru 36# (phenylethylphenol formaldehyde resin polyoxyethyl ether), Nongru 1600# (phenylethylphenol formaldehyde resin polyoxyethyl ether). One or more of the following: nonylphenol polyoxyethylene ether), ethylene oxide-propylene oxide block copolymer, NP series (nonylphenol polyoxyethylene ether), BY series (castor oil polyoxyethylene ether), RYD981 (phosphate wetting agent), BY-125 (castor oil polyoxyethylene ether), Nongru 33# (alkyl aromatic polyoxyethylene polyoxypropylene ether), Span series (sorbitan monostearate), OD series (compound nonionic emulsifier), Tween series (sorbitan fatty acid ester polyoxyethylene ether) and AEO series (fatty alcohol polyoxyethylene ether).

[0019] Preferably, the dispersant is selected from one or more of polycarboxylates (W03, W07), alkylnaphthalene sulfonate formaldehyde condensates (DNS), lignin sulfonates, alkylphenol polyoxyethylene ether formaldehyde condensate sulfates, alkylbenzene sulfonate calcium, naphthalenesulfonic acid formaldehyde condensate sodium salt, alkylphenol polyoxyethylene ether, fatty amine polyoxyethylene ether, fatty acid polyoxyethylene ether and glycerol fatty acid ester polyoxyethylene ether.

[0020] Preferably, the wetting agent is selected from one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, lakai powder BX, wetting and penetrating agent F, saponin powder, silkworm feces and soapberry powder.

[0021] Preferably, the penetrant is selected from one or more of penetrant JFC (fatty alcohol polyoxyethylene ether), penetrant T (diisooctyl maleate sulfonate), azone and silicone.

[0022] Preferably, the antifreeze agent is selected from one or more of ethylene glycol, propylene glycol, glycerol and urea.

[0023] Preferably, the thickener is selected from one or more of xanthan gum, polyvinyl alcohol, bentonite, carboxymethyl cellulose and magnesium aluminum silicate.

[0024] Preferably, the stabilizer is selected from one or more of epoxy soybean oil, epichlorohydrin, BHT, ethyl acetate, and triphenyl phosphate.

[0025] Preferably, the disintegrant is selected from one or more of bentonite, urea, ammonium sulfate, aluminum chloride, low-substituted hydroxypropyl cellulose, lactose, citric acid, succinic acid and sodium bicarbonate.

[0026] Preferably, the defoaming agent is selected from one or more of silicone oil, silicone compounds, C10-C20 saturated fatty acid compounds and C8-C10 fatty alcohol compounds.

[0027] The invention discloses an application of the compounded herbicidal composition of pyraclostrobin and fenpyrazone in controlling weeds in corn fields.

[0028] The herbicidal composition of the present invention can be prepared into a dosage form selected from the group consisting of emulsifiable concentrate, aqueous emulsion, microemulsion, wettable powder, aqueous suspension, oil suspension and water dispersible granules.

[0029] The mechanism of action of a single active ingredient is simple, and plants develop resistance quickly, while compound herbicides can slow down the development of resistance, and compound herbicides can effectively expand the weed control spectrum and enhance the efficacy. As an emerging cornfield herbicide, sulfonepyraclostrobin has high activity and low per-acre usage. It can complement the advantages of sulfonepyraclostrobin and achieve excellent weed control effects.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The synergistic effect of the present invention is obvious. It is not a simple superposition of the activities of each component, and the efficacy is greatly improved;

[0032] 2. High control efficacy, long lasting effect, active ingredients with different action mechanisms, and increased action sites are beneficial for overcoming and delaying the development of weed resistance, with low resistance risk;

[0033] 3. The amount of active ingredients used in the field is reduced, which reduces production and use costs, reduces pesticide residues and environmental pollution, and is highly safe;

[0034] 4. Expand the weed control spectrum, and have strong activity against grass weeds such as foxtail, crabgrass, barnyard grass, and broadleaf weeds such as wild pea, sophora japonica, and dayflower;

[0035] 5. The herbicidal composition of the present invention has an outstanding control effect on grass weeds and broadleaf weeds in corn fields, and can reduce the application dosage of each active ingredient, thereby reducing costs and pollution. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below in conjunction with embodiments.

[0037] Unless otherwise specified, all raw materials used in the examples are commercially available.

[0038] Example 1

[0039] In this embodiment 1, the mass ratio of pyraclostrobin to fenpyrazone is (5:1).

[0040] The herbicidal composition of sulfonepyraclostrobin and benzathine is made of the following raw materials in mass fractions:

[0041] sulfonepyraclostrobin, 50%;

[0042] benomyl, 10%;

[0043] Wetting agent sodium lauryl sulfate, 3%;

[0044] Dispersant calcium lignin sulfonate, 8%;

[0045] Filler white carbon black, 20%,

[0046] The balance is kaolin as filler.

[0047] The preparation method of the wettable powder prepared by the composition is as follows: adding the active ingredients sulfonepyraclostrobin and benzathine to the carrier filler white carbon black and kaolin, then adding the wetting agent sodium lauryl sulfate and the dispersant calcium lignin sulfonate, mixing, air flow pulverizing and then mixing to obtain the wettable powder.

[0048] Example 2

[0049] In this Example 2, the mass ratio of sulfonepyraclostrobin to benzathine is (4:1).

[0050] The herbicidal composition of sulfonepyraclostrobin and benzathine is made of the following raw materials in mass fractions:

[0051] sulfonepyraclostrobin, 16%;

[0052] benomyl, 4%;

[0053] Emulsifier agricultural milk NP-10, 2%;

[0054] Emulsifier castor oil polyoxyethylene ether, 2%;

[0055] Emulsifier phenylphenol polyoxyethylene ether phosphate, 2%;

[0056] Solvent: ethyl acetate, 30%;

[0057] Solvent ethanol, 10%;

[0058] Thickener xanthan gum, 0.1%;

[0059] Antifreeze ethylene glycol, 5%;

[0060] Defoaming agent silicone compound, 0.2%;

[0061] The balance is water.

[0062] The preparation method of the aqueous emulsion prepared by the composition is as follows: dissolving the active ingredients sulfonepyraclostrobin and benzathine, an emulsifier, a solvent, and a cosolvent into an oil phase, and uniformly mixing water, an antifreeze agent, and a thickener as a water phase; while shearing at a high speed in a reaction kettle, dripping the oil phase into the water phase, and shearing for 5 minutes to form a stable water-in-oil type aqueous emulsion.

[0063] Example 3

[0064] In this Example 3, the mass ratio of pyraclostrobin to fenpyrazone is (3:1).

[0065] The herbicidal composition of sulfonepyraclostrobin and benzathine is made of the following raw materials in mass fractions:

[0066] sulfonepyraclostrobin, 12%;

[0067] benomyl, 4%;

[0068] Solvent ethanol, 8%;

[0069] Solvent cyclohexanone, 15%;

[0070] Emulsifier RYD981, 15%;

[0071] Emulsifier BY-125, 5%;

[0072] Antifreeze ethylene glycol, 3%;

[0073] The balance is water.

[0074] The preparation method of the microemulsion prepared by the composition is as follows: the effective ingredients of sulfonepyraclostrobin and benzathine are completely dissolved in a solvent, and then an emulsifier and an antifreeze agent are added, mixed evenly, and finally water is added and stirred sufficiently to obtain the microemulsion.

[0075] Example 4

[0076] In this Example 4, the mass ratio of sulfonepyraclostrobin to benzathine is (2:1).

[0077] The herbicidal composition of sulfonepyraclostrobin and benzathine is made of the following raw materials in mass fractions:

[0078] sulfonepyraclostrobin, 10%;

[0079] benomyl, 5%;

[0080] Cosolvent ethanol, 8%;

[0081] solvent cyclohexanone, 13%;

[0082] Emulsifier agricultural milk 500#, 8%;

[0083] Emulsifier agricultural milk 604#, 12%;

[0084] Antifreeze ethylene glycol, 3%;

[0085] The balance is water.

[0086] The preparation method of the microemulsion prepared by the composition is as follows: the effective ingredients of sulfonepyraclostrobin and benzathine are completely dissolved with a solvent and a co-solvent, and then an emulsifier and an antifreeze agent are added, mixed evenly, and finally water is added, and after sufficient stirring, the microemulsion can be prepared.

[0087] Example 5

[0088] In this Example 5, the mass ratio of sulfonepyraclostrobin to benzathine is (1:1).

[0089] The herbicidal composition of sulfonepyraclostrobin and benzathine is made of the following raw materials in mass fractions:

[0090] sulfonepyraclostrobin, 6%;

[0091] benomyl, 6%;

[0092] Emulsifier agricultural milk 500#, 4%;

[0093] Agricultural milk 604#, 5%;

[0094] Agricultural milk 700#, 1%;

[0095] Solvent S-150#, 15%;

[0096] The balance was xylene.

[0097] The preparation method of the emulsifiable concentrate prepared from the composition is as follows: adding the active ingredients sulfonepyraclostrobin and benzathine to a mixed solvent of solvent S-150# and xylene, then adding surfactants Nongru 500#, Nongru 604# and Nongru 700#, and then stirring and mixing in a mixing kettle until the mixture is evenly mixed.

[0098] Example 6

[0099] In this Example 6, the mass ratio of sulfonepyraclostrobin to benzathine is (1:2).

[0100] The herbicidal composition of sulfonepyraclostrobin and benzathine is made of the following raw materials in mass fractions:

[0101] sulfonepyraclostrobin, 10%;

[0102] benomyl, 20%;

[0103] Dispersant W03, 2%;

[0104] Emulsifier OD20, 18%;

[0105] Thickener organobentonite, 1.0%;

[0106] The balance was methyl oleate.

[0107] The preparation method of the dispersible oil suspension prepared by the composition is as follows: the active ingredient sulfonepyraclostrobin, benzathine, emulsifier, thickener and dispersant are placed in a reaction kettle in sequence, methyl oleate is added and mixed evenly, and the product is obtained by high-speed shearing, wet sand grinding and finally homogenization filtration.

[0108] Example 7

[0109] In this Example 7, the mass ratio of sulfonepyraclostrobin to benzathine is (1:3).

[0110] The herbicidal composition of sulfonepyraclostrobin and benzathine is made of the following raw materials in mass fractions:

[0111] sulfonepyraclostrobin, 4%;

[0112] benomyl, 12%;

[0113] Emulsifier agricultural milk NP-10, 3%;

[0114] Dispersant W07, 5%;

[0115] Thickener xanthan gum, 0.15%;

[0116] Thickener magnesium aluminum silicate, 1.5%;

[0117] Antifreeze ethylene glycol, 4%;

[0118] Defoaming agent silicone compound, 0.2%;

[0119] The balance is water.

[0120] The preparation method of the water suspension prepared by the composition is as follows: the active ingredients of pyraclostrobin and pyraclostrobin, an emulsifier, a dispersant, a thickener, an antifreeze agent and a defoamer are placed in a reaction kettle, water is added and mixed evenly, and the product is obtained by high-speed shearing, wet sand grinding, and finally homogenization filtration.

[0121] Example 8

[0122] In this Example 8, the mass ratio of sulfonepyraclostrobin to benzathine is (1:4).

[0123] The herbicidal composition of sulfonepyraclostrobin and benzathine is made of the following raw materials in mass fractions:

[0124] sulfonepyraclostrobin, 1%;

[0125] benomyl, 4%;

[0126] Emulsifier agricultural milk DY981, 3%;

[0127] Dispersant W07, 2%;

[0128] Thickener xanthan gum, 0.2%;

[0129] Thickener magnesium aluminum silicate, 2.0%;

[0130] Antifreeze ethylene glycol, 4%;

[0131] Defoaming agent silicone compound, 0.2%;

[0132] The balance is water.

[0133] The preparation method of the water suspension prepared by the composition is as follows: the active ingredients of pyraclostrobin and pyraclostrobin, an emulsifier, a dispersant, a thickener, an antifreeze agent and a defoamer are placed in a reaction kettle, water is added and mixed evenly, and the product is obtained by high-speed shearing, wet sand grinding, and finally homogenization filtration.

[0134] Example 9

[0135] In this Example 9, the mass ratio of pyraclostrobin to fenpyrazone is (1:5).

[0136] The herbicidal composition of sulfonepyraclostrobin and benzathine is made of the following raw materials in mass fractions:

[0137] sulfonepyraclostrobin, 10%;

[0138] benomyl, 50%;

[0139] Wetting agent sodium dodecylbenzenesulfonate, 3%;

[0140] Dispersant DNS, 8%;

[0141] The remainder is attapulgite filler.

[0142] The preparation method of the water dispersible granules prepared by the composition is as follows:

[0143] The active ingredients of pyraclostrobin and benzathine are added to the carrier filler attapulgite, a wetting agent and a dispersant are added, mixed, and after air flow pulverization, 15% of water is added, and then the water-dispersible granule product is obtained by kneading, granulating, drying and screening.

[0144] Performance Testing

[0145] The agents obtained in Examples 1 to 9 were subjected to indoor combined toxicological bioassay experiments and field efficacy verification.

[0146] 1. Indoor toxicological bioassay of pyraclostrobin and fenpyraclostrobin.

[0147] Test agents: 99% sulfonepyraclostrobin technical drug, 97% benzathine technical drug;

[0148] Test targets: Echinochloa crus-galli, Commelina communis;

[0149] Experimental methods:

[0150] Through indoor bioassay, barnyard grass and Commelina communis were used as bioassay objects. Soil that had not been treated with herbicides was selected, pH = 6.8. After the soil was air-dried and sieved, it was quantitatively loaded into a plastic pot with a diameter of 32 cm and a depth of 20 cm. The stem and leaf spray method was adopted, referring to the NY / T1155.4-2006 Pesticide Indoor Bioassay Test Guidelines Herbicides Part 4. 30 target weed seeds were sown in a plastic pot, covered with 1 cm thick fine soil, and cultured in a controllable greenhouse. The temperature in the greenhouse was (25±2)℃ during the day and (20±2)℃ at night. The light cycle was 16D / 8L, and the light intensity was 1400μmol / (m 2 ·s), relative humidity (70±5)%. When the weeds grow to 2-5 leaves, the stems and leaves are sprayed. Each pot is sprayed with 1mL of the solution (diluted with water to prepare the solution, the dilution standard is 80g / mu of effective ingredient). Each treatment is repeated 4 times, and the treatment without the agent is set as the control. After treatment, the test materials are placed in a controllable greenhouse for cultivation, and the growth of the target weeds is observed regularly. After 15 days, the fresh weight of the plant is measured, and the toxicity of the agent to the target weeds is evaluated by the fresh weight inhibition rate.

[0151] Blank control solution: 1 mL DMF plus 400 mL of water containing 0.1% TWEEN80 emulsifier.

[0152] Data statistics and analysis:

[0153] The combined effect evaluation method was analyzed using DPS software to calculate the toxicity equation, LC50 value (mg / L) and co-toxicity coefficient.

[0154] The logarithmic value of the concentration of the drug (mg / L) was used as the independent variable x, and the probability value of the fresh weight inhibition rate was used as the dependent variable y. The toxicity regression equations were established respectively, and the LC50 of the single agent and each ratio was calculated using DPS software. The toxicity index and co-toxicity coefficient (CTC) were calculated according to the Sun Yunpei method. The results are shown in Tables 1 and 2. The calculation formula is as follows: (taking sulfonepyraclostrobin as the standard agent, its toxicity index is 100):

[0155] Measured toxicity index (ATI) = (LC50 of standard agent / LC50 of test agent) × 100;

[0156] Theoretical toxicity index (TTI) = ∑ (toxicity index ATI of a certain active ingredient × percentage content of the active ingredient in the mixture);

[0157] Co-toxicity coefficient (CTC) = [measured toxicity index (ATI) of the mixture / theoretical toxicity index (TTI) of the mixture] × 100;

[0158] When CTC is greater than 120, it is a synergistic effect; when it is less than 80, it is an antagonistic effect; when it is 80-120, it is an additive effect.

[0159] Table 1 The results of the toxicity test of different ratios of the active ingredients in Examples 1 to 9 on barnyard grass

[0160]

[0161] It can be seen from Table 1 that when the weight ratio of sulfonepyraclostrobin and benzathine is within 1:(0.2-5), the CTC values ​​are all greater than 80, showing a synergistic effect. Among them, when the weight ratio of sulfonepyraclostrobin: benzathine is 1:(1-4), the co-toxicity coefficient is ≥160, the synergistic effect is the best, and the LC50 is also small, which is manifested as low toxicity.

[0162] Table 2 The results of the toxicity test of different ratios of the active ingredients in Examples 1 to 9 on Commelina communis

[0163]

[0164]

[0165] It can be seen from Table 2 that when the ratio of sulfonepyraclostrobin to benzathine is within 1:(0.2-5), the CTC values ​​are all greater than 80, showing a synergistic effect. Among them, when the ratio of sulfonepyraclostrobin to benzathine is 1:(0.5-3), the co-toxicity coefficient is greater than 160, and the synergistic effect is the best.

[0166] It can be seen from Tables 1 and 2 that when the ratio of sulfonepyrazone and benzathine is 1:(0.2-5), the co-toxicity coefficient is greater than 100, indicating that the combination of sulfonepyrazone and benzathine has a synergistic effect on corn field weeds. When the optimal ratio of the two is 1:(1-3) (mass ratio), the synergistic effect is most obvious and the co-toxicity coefficient reaches the highest value.

[0167] 2. In order to further prove that the combination of sulfamethoxazole and benzathine has a synergistic effect on controlling weeds in corn fields when used in the field, the field efficacy test method was used.

[0168] Test method:

[0169] The weeds in the experimental corn field mainly include barnyard grass, dayflower, goosegrass, plantain, etc. The four weeds listed above were used as experimental objects, and the pesticides used were Examples 2, 3, 4, 5, 6, 7, and 8, and the control pesticides were 10% sulfamethoxazole SC and 30% benzathine OD.

[0170] Example 2: 20% (sulfone pyraclostrobin·pyraclostrobin) aqueous emulsion;

[0171] Example 3: 16% (sulfone pyraclostrobin·pyraclostrobin) microemulsion;

[0172] Example 4: 15% (sulfone pyraclostrobin·pyraclostrobin) microemulsion;

[0173] Example 5: 12% (sulfone pyraclostrobin·pyraclostrobin) emulsifiable concentrate;

[0174] Example 6: 30% (sulfone pyraclostrobin·pyraclostrobin) dispersible oil suspension;

[0175] Example 7: 16% (sulfone pyraclostrobin·pyraclostrobin) aqueous suspension;

[0176] Example 8: 5% (pyraclostrobin·pyraclostrobin water) suspension.

[0177] The field efficacy test was conducted with 10 treatments, including the implemented pesticide, the control pesticide, and clean water. The area of ​​each test plot was 50m 2 , 4 replicates per treatment, the same amount of pesticide per mu, random arrangement of plots, 0.5m protection rows between each plot and around the test field. Conventional spraying was carried out using a Gongnong-16 manual sprayer, spraying was carried out when the weeds were 2-5 leaves, and clean water was used as a control. There was no rainfall within 24 hours of pesticide application, no special bad weather during the test period, and conventional field management. Surveys were conducted once each at 15d and 30d after pesticide application, for a total of 2 times.

[0178] The growth of corn was visually inspected at 3, 7, 15, and 30 days after the application of the drug to see if any pesticide damage occurred. The weed control effect was investigated at 15 and 30 days after the application, and the results are shown in Tables 3 and 4. The test was conducted in accordance with the "Guidelines for Field Efficacy Tests of Pesticides" GB / T17980.30-2000. The survey method was to sample four points on the diagonal of each plot, with a radius of 0.25 m per point. 2 , record the number of weeds. The control effect calculation method is as follows:

[0179]

[0180] Table 3 Results of the efficacy of the pesticides in controlling weeds in corn fields 15 days after application

[0181]

[0182] Table 4 Results of the efficacy of the pesticides in controlling weeds in corn fields 30 days after application

[0183]

[0184] According to the data in Table 3 and Table 4, the control effect of the tested examples in corn fields is significantly higher than that of sulfonepyraclostrobin and benzathiapiprolin. After compounding in a certain ratio, the plant control effect of the example agent can reach more than 90%, indicating that sulfonepyraclostrobin and benzathiapiprolin can achieve a synergistic effect after compounding. In addition, in the field test, the growth of crops was not affected, with high biological safety and good environmental compatibility.

[0185] The average plant control effect of Examples 5, 6, and 7 is significantly higher than that of other proportions, and all reach more than 98% after 30 days, indicating that the best effect is achieved when the mass ratio of sulfonepyraclostrobin: benzathine is 1: (1-3). The two active ingredients have complementary effects on the control effects of different weed species, which can better expand the weed control spectrum and exert the efficacy.

Claims

1. A herbicidal composition of sulfonepyraclostrobin and benomyl, characterized in that: Including sulfamethoxazole and benomyl.

2. The herbicidal composition of sulfonepyraclostrobin and benomyl compound according to claim 1, characterized in that: The weight ratio of sulfonepyraclostrobin to benzathine is 1:(0.2-5).

3. The herbicidal composition of sulfonepyraclostrobin and benomyl compound according to claim 1, characterized in that: The weight percentage of sulfonepyraclostrobin and benomyl is 5% to 60% of the composition.

4. The herbicidal composition of sulfonepyraclostrobin and benomyl compound according to claim 1, characterized in that: It also includes auxiliary ingredients for pesticide preparations, which include carriers and adjuvants.

5. The herbicidal composition of sulfonepyraclostrobin and benomyl compound according to claim 4, characterized in that: The carrier is one or more of water, solvent and filler.

6. The herbicidal composition of pyraclostrobin and fenpyrazone according to claim 5, characterized in that: The solvent is selected from one or more of N,N-dimethylformamide, S-150#, cyclohexanone, acetone, toluene, xylene, dimethyl sulfoxide, methanol, ethanol, trimethylcyclohexanone, N-octylpyrrolidone, ethanolamine, triethanolamine, isopropylamine, N-methylpyrrolidone, propanol, butanol, ethylene glycol, diethylene glycol, ethylene glycol methyl ether, butyl ether, ethanolamine, isopropylamine, ethyl acetate and acetonitrile.

7. The herbicidal composition of sulfonepyraclostrobin and benomyl as claimed in claim 5, characterized in that: The filler is a solid filler or a liquid filler; the solid filler is selected from one or more of kaolin, diatomaceous earth, bentonite, attapulgite, white carbon black, starch and light calcium carbonate; the liquid filler is selected from one or more of methyl oleate, soybean oil, corn oil and mineral oil.

8. The herbicidal composition of sulfonepyraclostrobin and benomyl as claimed in claim 4, characterized in that: The auxiliary agent includes a surfactant, and the surfactant is selected from one or more of an emulsifier, a dispersant, a wetting agent and a penetrant.

9. The herbicidal composition of pyraclostrobin and fenpyrazone according to claim 8, characterized in that: The auxiliary agent also includes one or more of antifreeze agent, thickener, stabilizer, disintegrant and defoaming agent.

10. Use of a herbicidal composition of sulfamethoxazole and benomyl in controlling weeds in corn fields.

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