Weeding composition containing aclonifen and thiencarbazone-methyl and application of weeding composition

Abstract

The invention discloses a weeding composition containing aclonifen and thiencarbazone-methyl and application of the weeding composition, and belongs to the technical field of pesticides. The weeding composition is composed of aclonifen and thiencarbazone-methyl in effective weeding amount, the aclonifen and the thiencarbazone-methyl are compounded and combined, a remarkable synergistic effect on prevention and removal of the polypogon fugax is achieved, a new weeding agent is developed on the basis, and prevention and removal of the polypogon fugax are effectively achieved.

Description

Technical Field

[0001] This application belongs to the field of pesticide technology, specifically relating to a herbicidal composition of bensulfuron-methyl and thiamethoxam and a herbicide containing the herbicidal composition, and further relating to the application of the herbicidal composition and herbicide in the control of crop weeds, especially sedge. Background Technology

[0002] Clover ( Polypogon fugax ) is an annual herbaceous plant belonging to the genus *Clerodendrum* of the Poaceae family. It is a typical summer-ripening crop field weed, mainly harming wheat, rapeseed, green manure, and vegetable fields. *Clerodendrum* has a strong seed reproduction ability, its tiny seeds are easily dispersed by wind, and it is highly resistant to adverse conditions, adaptable to a wide range of temperatures, has a well-developed root system, and strong regeneration ability. The control of *Clerodendrum* mainly faces the following difficulties: (1) its seeds have a short dormancy period and a high germination rate in shallow soil layers; (2) herbicide resistance, long-term use of a single herbicide can easily induce resistance; (3) its growth cycle is synchronized with crops such as wheat and rapeseed, making it difficult to distinguish the seedling stage.

[0003] Single-active herbicides have a narrow spectrum of weed control and are prone to developing resistance. Although rotating or combining herbicides can mitigate resistance to some extent, this complicates application procedures and currently used herbicides are not very effective against *Clerodendrum trichotomum*.

[0004] Therefore, it is essential to develop new herbicides to effectively control *Clerodendrum trichotomum*. Summary of the Invention

[0005] In view of this, the primary objective of this application is to provide a herbicidal composition of bensulfuron-methyl and thiamethoxam, wherein bensulfuron-methyl and thiamethoxam synergistically enhance each other to achieve effective control of sedge. To achieve the above objectives, this application adopts the following technical solution: One aspect of this application discloses a herbicidal composition of bensulfuron-methyl and thiamethoxam, the herbicidal composition comprising herbicidally effective amounts of bensulfuron-methyl and thiamethoxam.

[0006] Another aspect of this application discloses a herbicide comprising the herbicidal composition described above and any pesticide-acceptable adjuvant.

[0007] Another aspect of this application discloses the use of the herbicidal composition or herbicide as described above in controlling barnyard grass.

[0008] The beneficial effects of this application are: The two herbicidal active ingredients, aclonifen and thiencarbazone-methyl, in the herbicidal composition provided in the present application belong to two different herbicidal components, and the two components do not interfere with each other, expand the herbicidal spectrum, and improve the herbicidal efficiency. Moreover, the two components have a good synergistic effect, can effectively prevent and control the weeds, and have a higher prevention and control effect than single agent, a smaller dosage, and a slower development of weed resistance. DETAILED DESCRIPTION

[0009] The embodiments of the present application will be clearly and completely described below. The technical solutions in the embodiments described below are exemplary, and only some possible technical implementations of the present application, and not all possible implementations. Those skilled in the art can certainly combine the embodiments of the present application to obtain other embodiments without creative labor, and these embodiments are also within the protection scope of the present application.

[0010] The first aspect of the present application discloses a herbicidal composition of aclonifen and thiencarbazone-methyl, characterized in that the herbicidal composition is composed of an herbicidally effective amount of aclonifen and thiencarbazone-methyl.

[0011] The herbicidal composition provided in the present application is composed of aclonifen and thiencarbazone-methyl. Wherein: Aclonifen, the chemical name of which is 2-chloro-6-nitro-3-phenoxyaniline, the molecular formula of which is C 12 H9ClN2O3, the molecular weight of which is 264.66, and the molecular structural formula of which is as follows: .

[0012] Aclonifen is a diphenyl ether herbicide, which belongs to a protoporphyrin oxidase inhibitor. Its action mechanism is to inhibit solanecium pyrophosphoric acid synthase (SPS), resulting in a sharp decrease in the level of plastoquinone in weeds, thereby achieving the effect of weed control. Aclonifen is mainly used for preventing and controlling gramineous weeds and broadleaf weeds in potato, sunflower, and winter wheat fields, and can also be used for crops such as pea, carrot, and broad bean fields.

[0013] Thiencarbazone-methyl, the chemical name of which is 4-[(4,5-dihydro-3-methoxy-4-methyl-5-oxo-1H-1,2,4-triazol-1-yl) carbonylaminosulfonyl]-5-methylthiophene-3-carboxylic acid methyl ester, the CAS registration number of which is 317815-83-1, and the structural formula of which is as follows: .

[0014] Thiencarbazon is a sulfonylaminocarbonyltriazolinone herbicide, mainly used in corn fields, grain fields and lawns and other crops to prevent annual grasses and broadleaf weeds. Thiencarbazon inhibits the activity of acetolactate synthase (ALS) in plants, preventing the biosynthesis of branched-chain amino acids, thereby inhibiting cell division and stopping weed growth. The agent has systemic properties, can be absorbed by the roots and leaves of weeds, and conducts upwards, while having a triple herbicidal mechanism of soil closure, early post-emergence stem and leaf treatment, and activation by water, providing stable herbicidal effect.

[0015] There is no prior drug regimen of chloroneb and thiencarbazon mixed for preventing and controlling Aeluropus squarrosus.

[0016] In this application, Aeluropus squarrosus is used as the test target, and the results show that chloroneb and thiencarbazon mixed for preventing and controlling Aeluropus squarrosus exhibit significant synergistic effect.

[0017] In this application, the herbicidal effective amount refers to the amount of active ingredients that cause adverse changes, including deviating from natural development, killing, regulating, dehydrating, delaying, etc. The herbicidal effective amount is not unique, but depends on various factors such as the type of weeds, the type of treated plant material, climatic conditions, soil conditions, crop types, application methods and application times, etc., and therefore is not particularly limited, and those skilled in the art can determine the herbicidal effective amount by further testing based on the test methods known in the art.

[0018] In some examples of this application, the weight ratio of chloroneb to thiencarbazon in the herbicidal composition is (2.62-8.92):(13.64-41.58). Indoor activity tests have confirmed that within this ratio range, chloroneb and thiencarbazon have significant synergistic effect in preventing and controlling Aeluropus squarrosus.

[0019] As a preferred example, the weight ratio of chloroneb to thiencarbazon in the herbicidal composition is 2.64:41.58, 3.92:34.58, 5.22:27.58, 7.62:20.54 or 8.92:13.64.

[0020] More preferably, the weight ratio of chloroneb to thiencarbazon in the herbicidal composition is 5.22:27.58, under which the synergistic effect of chloroneb and thiencarbazon is most significant.

[0021] The second aspect of the present application discloses a herbicide containing the herbicidal composition of the first aspect of the present application and any acceptable pesticide adjuvant.

[0022] In some examples, the weight percentage of the herbicidal composition in the herbicide is 30%-60%.

[0023] In some examples, the herbicide has a weight percentage of the adjuvant of 3-90% The dosage form of the herbicide described in the present application is not particularly limited and can be any common pesticide formulation dosage form in the art, for example, can be water dispersible granules, suspensions, emulsifiable concentrates, etc. As a preferred example, the dosage form of the herbicide is a suspension.

[0024] In some examples, the adjuvant includes at least one of a solvent, an emulsifier, a dispersant, a wetting agent, an antifreeze, a thickening agent, an antifoaming agent, a disintegrant, a binder, a carrier, a pH adjuster, which can be selected according to the corresponding guidelines or known in the art in accordance with the specific dosage form.

[0025] For the solvent, specific examples include, but are not limited to, at least one of methanol, ethanol, butanol, isobutanol, ethylene glycol, propylene glycol, glycerol, polyethylene glycol, 1-dodecanol, 1-tetradecanol, 1-octadecanol, 1-nonadecanol, 1-icosanol, toluene, xylene, acetone, cyclohexanone, N-long chain alkyl pyrrolidone, ethyl acetate, dimethylformamide, dimethyl sulfoxide. For the emulsifier, specific examples include, but are not limited to, at least one of sodium dodecyl sulfate, alkyl polyethylene glycol ether, alkylphenyl polyethylene glycol ether, polyoxyethylene sorbitan ester, polyoxyethylene fatty acid ester, alkylphenol polyoxyethylene ether phosphate, ethoxylated alkylphenyl ether, ethoxylated alkyl ether, polyoxyethylene-polyoxypropylene block copolymer, phenylethyl phenol polyoxyethylene polyoxypropylene ether, alkylbenzene sulfonate, lignin sulfonate, styrene phenol polyoxyethylene ether, alkylphenol polyoxyethylene ether formaldehyde condensate, castor oil, oxirane adduct, oxirane adduct derivative, sucrose fatty acid ester, Tween, monodecanoate. For the dispersant, specific examples include, but are not limited to, at least one of lignin sulfonate, sodium p-hydroxyphenyl lignin sulfonate, fatty alcohol polyoxyethylene ether phosphate, fatty amide-N-methyl taurine sodium salt, N-methyl taurine sodium salt, alkylphenol polyoxyethylene ether sulfate, sulfurous pulp waste liquid, fatty acid ester sulfate, polyoxyethylene polyoxypropylene block copolymer, alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, polyoxyethylene glyceryl mono fatty acid ester, hydroxymethyl cellulose, fatty alcohol sulfate, alkyl naphthalene formaldehyde condensate, polyvinyl alcohol, sulfite pulp waste liquid, acrylic acid homopolymer sodium salt, polyethylene carboxylic acid sodium salt, naphthalene sulfonic acid sodium formaldehyde condensate, dioctyl sodium sulfosuccinate. For the wetting agent, specific examples include, but are not limited to, at least one of dodecylbenzenesulfonate, Agrilure 2000 series, SOPA 230, SOPA 270, SOPA 235, tea dust, soap nut powder, lappa powder, trisiloxane polyoxyethylene ether, higher fatty acid glyceride, petroleum sulfonic acid sodium. For the antifreeze agent, specific examples include, but are not limited to, at least one of ethylene glycol, propylene glycol, glycerol, sorbitol. For the thickening agent, specific examples include, but are not limited to, at least one of polyacrylate, xanthan gum, magnesium aluminum silicate, sodium carboxymethyl cellulose, natural polysaccharide, xanthan gum, gelatin. For the antifoaming agent, specific examples include, but are not limited to, at least one of silicone oil, methanol, ethanol, epoxy soybean oil, silicone. For the disintegrant, specific examples include, but are not limited to, at least one of urea, magnesium chloride, aluminum chloride, sodium chloride, ammonium sulfate, bentonite. For the binder, specific examples include, but are not limited to, at least one of starch, polyvinyl acetate, polyvinyl alcohol, polyethylene glycol, sodium silicate, gelatin, soybean lecithin, cyclodextrin, gum arabic, carboxy cellulose, polyvinylpyrrolidone. For the carrier, specific examples include, but are not limited to, at least one of kaolin, diatomite, activated white clay, white carbon, clay, light calcium carbonate, talc powder, montmorillonite.For the pH adjuster, specific examples include, but are not limited to, at least one of sodium hydroxide, potassium hydroxide, hydrochloric acid, acetic acid, phosphoric acid, citric acid. For the stabilizer, specific examples include, but are not limited to, at least one of acid isopropyl phosphate, BHT, o-phenanthroline, tolyl glycidyl ether, polyvinyl glycol diglycidyl ether, epichlorohydrin, sodium sorbate, aminobenzoic acid, epoxidized soybean oil, polyethylene glycol. For the penetration enhancer, specific examples include, but are not limited to, laurocapram and / or JFC.

[0026] In some preferred examples, a suspension agent is shown in the present application, the adjuvants in the suspension agent include, by weight percentage, wetting agent 0.4-28%, dispersant 0.4-27%, thickening agent 0.05-6%, stabilizer 0.12-5%, penetration enhancer 0-8%, antifoaming agent 0.45-9%, antifreeze agent 0.1-10%, pH adjuster 0.1-8%, solvent 1-80%.

[0027] The preparation method of the suspension agent is not particularly limited and can be any conventional method. In some specific examples, the preparation method of the suspension agent includes the following steps: uniformly mixing the components and ball milling in a ball mill for 2-5 hours to form a coarse dispersion liquid, adjusting the pH value to 4-7, and then wet ultrafine grinding to make the average particle size meet the national standard, i.e. to obtain the suspension agent.

[0028] In some preferred examples, the suspension agent includes, by weight percentage, chloroxuron 1-50%, thifensulfuron-methyl 1-50%, sodium lignosulfonate 1-20%, triphenyl ethylene phenol polyoxyethylene ether phosphate 1-15%, xanthan gum 0.1-5%, epoxidized soybean oil 0.1-3%, silicone oil 1-5%, propylene glycol 1-5%, ethyl acetate 0.5-1%, and water to make up the balance to 100%.

[0029] Specifically, by adding wetting agents, dispersants and utilizing their synergistic effect, the original drug surface is closely adsorbed, and the original drug suspension rate is significantly improved by more than 90% through the electrostatic effect and steric hindrance mechanism. Further, the suspension rate of the suspension agent is still maintained at more than 90% after 14 days of storage at 54°C, and no creaming phenomenon is observed, which reflects high thermal stability. In view of the fact that the suspension agent system uses water as the dispersion medium, in order to enhance its stability in low temperature environment, ethylene glycol, propylene glycol and the like are added as antifreeze components. However, in actual application, due to the synergistic effect of the dispersant and the wetting agent, a large amount of foam is easily generated during use, which adversely affects the use effect. In view of this problem, the present application selects propylene glycol as an antifreeze agent, and by adding xanthan gum and silicone oil, not only can the good dispersibility, thermal storage stability and cold storage stability of the suspension agent at low temperature be effectively maintained to meet the specified standard, but also the foam generation is significantly reduced, specifically the foaming volume is less than 15 milliliters within 1 minute, thereby greatly optimizing the use performance of the product.

[0030] The third aspect of the present application discloses the use of the herbicidal composition according to the first aspect or the herbicide according to the second aspect in the control of Digitaria sanguinalis.

[0031] The present application will be further illustrated below in conjunction with specific examples. It should be noted that the following specific examples are for illustrative purposes only, and do not limit the scope of the present application in any way.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0033] In addition, unless otherwise specified, the methods without specific conditions or steps are conventional methods, and the reagents and materials used can be obtained from commercial channels.

[0034] Example 1: Indoor toxicity determination The synergistic effect of the two-component herbicidal composition of chlortoluron and thiencarbazone-methyl was evaluated by Sun Yunpei's co-toxicity coefficient (CTC) method, and the co-toxicity coefficient of the two active ingredients after compounding in a certain proportion was determined. If CTC>120, it indicates synergistic effect, if CTC<80, it indicates antagonistic effect, and if 80≤CTC≤120, it indicates additive effect.

[0035] The specific indoor toxicity determination test is as follows: (1) Test agent: 98% chlortoluron technical material (synthesized test sample by Anhui Fengle Agricultural Chemical Co., Ltd.) and 98% thiencarbazone-methyl technical material (Bayer AG).

[0036] (2) Test target: Digitaria sanguinalis (L.) Scop.

[0037] (3) Test method: According to the "Guidelines on Laboratory Tests for Pesticides Herbicides Part 4: Determination of Activity Test Stem Leaf Spray Method" (NY / T 1155.4-2006), "Guidelines on Laboratory Tests for Pesticides Herbicides Part 7: Determination of Combined Action of Mixtures" (NY / T 1155.7-2006) requirements, the test soil is quantitatively filled to 3 / 4 of the pot, then irrigated from the top of the pot, so that the soil is completely wetted to saturation. The pretreated test weed seeds are evenly and quantitatively sown on the soil surface (through the germination rate conversion, to ensure the density of the control treatment weeds is 150-180 plants per square meter), and the soil is covered with 0.5 cm according to the size of the seeds. After sowing, it is moved into the greenhouse for conventional culture, and after germination, the seedlings are fixed and the density is 120 plants / m 2 At the 3-4 leaf stage of weeds, the stems and leaves are sprayed for treatment, and the determination of chlorthal-dimethyl and thiencarbazone-methyl on Digitaria sanguinalis is carried out to obtain the co-toxicity coefficient to clarify whether there is synergism. The co-toxicity coefficient (CTC) method proposed by Sun & Johnson (1960) is used to evaluate the combined action. Generally, when the co-toxicity coefficient is significantly greater than 120, it indicates synergism, when the co-toxicity coefficient is close to 100, it indicates additive effect, and when the co-toxicity coefficient is significantly less than 80, it indicates antagonism.

[0038] (4) Evaluation method of combined action: DPS software is used to analyze and calculate the toxicity equation, EC 50 values (mg / L) and co-toxicity coefficients.

[0039] The logarithmic value of the concentration of the pesticide (mg / L) is taken as the independent variable x, and the probability value of the fresh weight inhibition rate is taken as the dependent variable y. The toxicity regression equation is established respectively. The EC 50 of single agent and each ratio is calculated by DPS software. The toxicity index and co-toxicity coefficient (CTC) are calculated according to Sun Yunpei method. The calculation formula is as follows: (taking thiencarbazone-methyl as the standard pesticide, its toxicity index is 100): Actual toxicity index (ATI) = (standard pesticide EC50 / test pesticide EC50) x 100; Theoretical toxicity index (TTI) = ∑ (toxicity index of a certain active ingredient ATI x percentage of that active ingredient in the mixture); Co-toxicity coefficient (CTC) = [measured toxicity index of the mixture (ATI) / theoretical toxicity index of the mixture (TTI)] x 100.

[0040] The test results are shown in Table 1.

[0041] Table 1 Combined action determination results of chlorthal-dimethyl and thiencarbazone-methyl in different ratios

[0042] From the test results in Table 1, when the weight ratio of chlorthiamid and thiencarbazone-methyl is 2.62-8.92:13.64-41.58, the co-toxicity coefficients are all greater than 120, indicating that chlorthiamid and thiencarbazone-methyl have obvious synergistic effect on Aegopodium podagraria L., especially when the weight ratio of chlorthiamid:thiencarbazone-methyl is 5.22:27.58, the synergistic effect is most obvious.

[0043] Example 2: 44.2% chlorthiamid·thiencarbazone-methyl suspension concentrate The composition of the suspension concentrate in this example is calculated by weight percentage: chlorthiamid 2.62%, thiencarbazone-methyl 41.58%, sodium lignosulfonate 4.3%, triphenyl ethenyl phenol polyoxyethylene ether phosphate 6.6%, xanthan gum 3.1%, epoxy soybean oil 2.7%, silicone oil 1.9%, propylene glycol 3.8%, ethyl acetate 3.9%, and water to make up the balance to 100%.

[0044] The preparation method of the suspension concentrate is as follows: mix the components uniformly and ball mill in a ball mill for 4 hours to form a coarse dispersion liquid, adjust the pH value to 7, and then control the particle size D90≤5 µm by wet ultrafine grinding to obtain the suspension concentrate.

[0045] Example 3: 38.5% chlorthiamid·thiencarbazone-methyl suspension concentrate The composition of the suspension concentrate in this example is calculated by weight percentage: chlorthiamid 3.92%, thiencarbazone-methyl 34.58%, sodium lignosulfonate 4.7%, triphenyl ethenyl phenol polyoxyethylene ether phosphate 5.9%, xanthan gum 3.7%, epoxy soybean oil 2.2%, silicone oil 2.3%, propylene glycol 3.9%, ethyl acetate 3.6%, and water to make up the balance to 100%.

[0046] The preparation method of the suspension concentrate is as follows: mix the components uniformly and ball mill in a ball mill for 4 hours to form a coarse dispersion liquid, adjust the pH value to 7, and then control the particle size D90≤5 µm by wet ultrafine grinding to obtain the suspension concentrate.

[0047] Example 4: 32.8% chlorthiamid·thiencarbazone-methyl suspension concentrate The composition of the suspension concentrate in this example is calculated by weight percentage: chlorthiamid 5.22%, thiencarbazone-methyl 27.58%, sodium lignosulfonate 4.0%, triphenyl ethenyl phenol polyoxyethylene ether phosphate 4.3%, xanthan gum 2.77%, epoxy soybean oil 1.1%, silicone oil 1.24%, propylene glycol 3.83%, ethyl acetate 2.15%, and water to make up the balance to 100%.

[0048] The preparation method of the suspension concentrate is as follows: mix the components uniformly and ball mill in a ball mill for 4 hours to form a coarse dispersion liquid, adjust the pH value to 7, and then control the particle size D90≤5 µm by wet ultrafine grinding to obtain the suspension concentrate.

[0049] Example 5: 56.32% chlorthiamid·thiencarbazone-methyl suspension concentrate The composition of the suspension agent in this example is calculated by weight percentage: chlortoluron 15.24%, thiencarbazone-methyl 41.08%, sodium lignosulfonate 5.4%, triphenyl ethylene phenol polyoxyethylene ether phosphate 5.72%, xanthan gum 3.25%, epoxy soybean oil 1.32%, silicone oil 2.2%, propylene glycol 3.93%, ethyl acetate 3.85%, and water to make up the balance to 100%.

[0050] The preparation method of the suspension agent is as follows: refer to Example 2.

[0051] Example 6: 45.12% chlortoluron·thiencarbazone-methyl suspension agent The composition of the suspension agent in this example is calculated by weight percentage: chlortoluron 17.84%, thiencarbazone-methyl 27.28%, sodium lignosulfonate 5.62%, triphenyl ethylene phenol polyoxyethylene ether phosphate 5.84%, xanthan gum 3.38%, epoxy soybean oil 1.91%, silicone oil 2.65%, propylene glycol 4.43%, ethyl acetate 3.56%, and water to make up the balance to 100%.

[0052] The preparation method of the suspension agent is as follows: refer to Example 2.

[0053] Comparative Example 1: 50% chlortoluron suspension agent The composition of the suspension agent in this example is calculated by weight percentage: chlortoluron 50%, sodium lignosulfonate 4.0%, triphenyl ethylene phenol polyoxyethylene ether phosphate 4.3%, xanthan gum 2.77%, epoxy soybean oil 1.1%, silicone oil 1.24%, propylene glycol 3.83%, ethyl acetate 2.15%, and water to make up the balance to 100%.

[0054] The preparation method of the suspension agent is as follows: refer to Example 2.

[0055] Comparative Example 2: 50% thiencarbazone-methyl suspension agent The composition of the suspension agent in this example is calculated by weight percentage: thiencarbazone-methyl 50%, sodium lignosulfonate 4.0%, triphenyl ethylene phenol polyoxyethylene ether phosphate 4.3%, xanthan gum 2.77%, epoxy soybean oil 1.1%, silicone oil 1.24%, propylene glycol 3.83%, ethyl acetate 2.15%, and water to make up the balance to 100%.

[0056] The preparation method of the suspension agent is as follows: refer to Example 2.

[0057] Comparative Example 3: 20% pinoxaden EC 20% pinoxaden EC (registration certificate PD20200421, produced by Anhui Fengle Agrochemical Co., Ltd.) is used as a conventional control agent.

[0058] Determination of physical and chemical properties According to the NY / T1860-2016 Guidelines for the Determination of Physicochemical Properties of Pesticides, the suspension concentrates in Examples 2-6 were tested for suspension rate, thermal storage stability, cold storage stability, and persistent foaming properties to verify their formulation stability. The test results are shown in Table 2.

[0059] Table 2. Experiments on the determination of physicochemical properties of suspensions in the examples.

[0060] The test results in Table 2 show that the suspending agents in Examples 2-6 all passed the tests in terms of suspension rate, thermal and cold storage stability, and pourability, with a persistent foaming capacity of ≤15mL. Their physicochemical properties are excellent, and their stability and storage properties are guaranteed.

[0061] Field efficacy trials 1. Test location: Da Kuang Village, Jiyang County, Shandong Province.

[0062] 2. Test target: Clematis armandii.

[0063] 3. Experimental crop, variety and growth status: Winter wheat, variety Jimai 22, sown on September 30, with a sowing rate of 12 kg per mu and a bed width of 3.8 m.

[0064] 4. Experimental Design: The Honda efficacy test included nine treatments: the experimental agent (the suspension of the example), the control agent (the comparative agent), and a blank control (water). Each test plot had an area of ​​20 m². 2 Each treatment was replicated four times, with plots randomly arranged. A 0.5m protective row was placed between each plot and around the experimental field. A standard Gongnong-16 manual sprayer was used for routine spraying. Foliar spraying was applied to wheat fields at the 2-4 leaf stage of weeds. Water served as a control. No rainfall occurred within 24 hours of application, and there were no particularly severe weather conditions during the experiment. Routine field management was maintained. Efficacy was assessed 15 days after application.

[0065] The wheat growth was visually observed at 3, 7, and 15 days after pesticide application to check for any phytotoxicity. Weed control efficacy was also investigated 15 days after application. The experiment was conducted according to the "Guidelines for Field Efficacy Trials of Pesticides" GB / T 17980.30-2000. The survey method involved sampling four points diagonally across each plot, with each point 0.25m in diameter. 2 Record the number of weeds. The method for calculating the control effect is as follows:

[0066] The specific dosages and results of each test drug are shown in Table 3.

[0067] Table 3 Results of field efficacy trials

[0068] As can be seen from the test results in Table 3, the control effect of each of the test agents of the embodiments is more than 70% when the amount of the mixture of chlorthiamid and thiencarbazone-methyl used is 15-30 ml / acre, which is obviously better than the control effect of chlorthiamid and thiencarbazone-methyl single agents on the control of Aegilops sharonensis. Further, the control effect of Example 2 is better than that of Comparative Example 1, even when the amount of the single agent EC 50 The actual application effect of the complex preparation is better than that of the single agent even when the amount of the single agent EC

[0069] In terms of yield, the yield of each of the embodiments is obviously improved compared to the yield of the comparative examples and the blank control, and the yield-increasing effect of Example 4 is the best. In terms of safety, each of the embodiments does not affect the growth of wheat, and the safety is guaranteed.

[0070] According to the above experimental results, it can be concluded that the herbicidal composition of chlorthiamid and thiencarbazone-methyl provided in the present application has a significant synergistic effect on the control of Aegilops sharonensis and is safe for the growth of wheat.

[0071] It should be noted that the present application is not limited to the above embodiments. The above embodiments are only examples, and embodiments having the same technical idea and playing the same role and effect within the scope of the technical solutions of the present application are all included in the technical scope of the present application. In addition, within the scope of the main idea of the present application, various modifications of the embodiments, combination of part of the components of the embodiments, and other ways constructed by the modifications are also included in the scope of the present application.

Claims

1. A herbicidal composition of bensulfuron-methyl and thiamethoxam, characterized in that, The herbicidal composition consists of herbicidal amounts of bensulfuron and thiamethoxam.

2. The herbicidal composition according to claim 1, characterized in that, In the herbicidal composition, the weight ratio of bensulfuron-methyl to thiamethoxam is (2.62~8.92):(13.64~41.58).

3. The herbicidal composition according to claim 1, characterized in that, In the herbicidal composition, the weight ratio of bensulfuron-methyl to thiamethoxam is 2.64:41.58, 3.92:34.58, 5.22:27.58, 7.62:20.54, or 8.92:13.

64.

4. The herbicidal composition according to claim 1, characterized in that, In the herbicidal composition, the weight ratio of bensulfuron-methyl to thiamethoxam is 5.22:27.

58.

5. A herbicide, characterized in that, It contains the herbicidal composition according to any one of claims 1-4 and any pesticide-acceptable adjuvant.

6. The herbicide as described in claim 5, characterized in that, In the herbicide, the weight percentage of the herbicidal composition is 30% to 60%.

7. The herbicide as described in claim 5 or 6, characterized in that, In the herbicide, the weight percentage of the adjuvant is 3%-90%.

8. The herbicide as described in claim 5, characterized in that, The herbicide is in the form of a suspension concentrate.

9. The herbicide as described in claim 8, characterized in that, The additives include at least one of solvents, emulsifiers, dispersants, wetting agents, antifreeze agents, thickeners, defoamers, disintegrants, binders, carriers, and pH adjusters.

10. The use of the herbicidal composition according to any one of claims 1-4 or the herbicide according to any one of claims 5-9 in controlling *Hemiberlesia lataniae*.

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