A herbicidal composition containing metsulfuron-methyl and flumetsulam and its application

Abstract

The present invention discloses a herbicidal composition containing flumetin-methyl and flumetin-amid and its application, wherein the active ingredients include active ingredient A and active ingredient B, wherein active ingredient A is flumetin-methyl and active ingredient B is flumetin-amid. The weight ratio of active ingredient A to active ingredient B is 50:1 to 1:50. The composition can be formulated into a dosage form permitted in agriculture, preferably a dispersible oil suspension, emulsifiable concentrate, suspension, or water-dispersible granules. The present invention has reasonable components, good weed control effect, high prevention effect, low dosage, wide weed control spectrum, and safety to crops.

Description

Technical Field

[0001] The invention relates to the technical field of compound pesticides, and in particular to a weed killing composition containing metsulfuron-methyl and flumetsulam and application thereof. Background Art

[0002] With the increase in corn planting area and the continuous improvement of field multiple cropping index, coupled with extensive farming in some areas, corn field weeds are becoming more and more serious. The occurrence of weeds in corn fields poses a serious threat to my country's corn production. Doing a good job in weed control is a key factor in ensuring high and stable corn yields. At present, chemical agents are the main means and important measures for controlling weeds in corn fields, and a large number of herbicides are widely used in corn production. However, some long-term residual effects and single long-term use will not only cause yield losses to some sensitive corns, but also have adverse effects on the environment, groundwater and corn crops, and may even lead to weed resistance and affect the stability of the weed community population structure.

[0003] Fluthiazide-methyl is a protoporphyrinogen oxidase inhibitor. It acts quickly on the leaves of sensitive weeds, causing protoporphyrin accumulation and enhancing cell membrane lipid peroxidation, thereby causing irreversible damage to the cell membrane structure and cell function of sensitive weeds. It is mainly used to control broadleaf weeds in corn and soybean fields, and is particularly effective against some difficult-to-control broadleaf weeds. The chemical structure is:

[0004]

[0005] Sulfonamide belongs to the triazolopyrimidine sulfonamide class and is a typical acetolactate synthase inhibitor. It inhibits the synthesis of branched-chain amino acids, which blocks protein synthesis and stops plant growth. It is suitable for controlling annual and perennial broadleaf weeds in corn fields. The chemical structure is:

[0006]

[0007] Mixing different types of herbicides has the advantages of expanding the weed control spectrum, improving the control effect, delaying weed resistance, and saving time and labor. Through the screening of pesticide formulas, the control effect can be effectively improved, the dosage can be reduced, the cost can be reduced, and the generation of weed resistance can be delayed, which is an important means of comprehensive agricultural management. The applicant has conducted in-depth research on the formula of metsulfuron-methyl and flumetsulam, and found that the mixing of metsulfuron-methyl and flumetsulam has a synergistic effect on corn field weed control within a certain mixing ratio range. After further research, the present invention was completed. Summary of the invention

[0008] The purpose of the present invention is to solve the problem that herbicides in the prior art produce resistance to farmland weeds and have poor actual control effects, and to provide a herbicidal composition that is highly efficient, low toxic, quick-acting and has a long lasting effect and is beneficial to the comprehensive control of farmland weeds.

[0009] Another object of the present invention is to use the composition for controlling weeds in farmland, especially for controlling weeds in corn fields.

[0010] The technical solution of the present invention is as follows:

[0011] A herbicidal composition containing flumetin-methyl and pyrasulfoac, characterized in that the composition comprises an active ingredient A and an active ingredient B, wherein the active ingredient A is flumetin-methyl and the active ingredient B is pyrasulfoac.

[0012] Furthermore, the weight ratio of active ingredient A to active ingredient B is 50:1 to 1:50.

[0013] Furthermore, the weight ratio of flumet-methyl to foramsulfuron is 10:1 to 1:25; preferably, the mass ratio is 5:1 to 1:15.

[0014] Furthermore, the total weight percentage of the active ingredient A and the active ingredient B in the composition is 5% to 95%, preferably 10% to 90%.

[0015] Furthermore, the herbicide composition also includes an adjuvant, which is selected from one or more of a solvent, a wetting agent, a dispersant, an emulsifier, a thickener, a disintegrant, an antifreeze agent, a defoaming agent, a preservative, a stabilizer, a binder, a dispersion medium, a carrier, and a filler.

[0016] The solvent is selected from one or more of benzene, toluene, xylene, methanol, ethanol, n-butanol, trimethylbenzene, methyl oleate, N,N-dimethyldecylamide, dimethyl sulfoxide, dimethylformamide, propylene carbonate, etc.;

[0017] The wetting agent is selected from one or more of alkyl naphthalene sulfonates, alkylphenol polyoxyethylene ether formaldehyde condensate sulfates, alkylphenol polyoxyethylene ether phosphates, phenethylphenol polyoxyethylene ether phosphates, alkyl sulfates, alkyl sulfonates, naphthalene sulfonates, fatty alcohol ethoxylates, etc.;

[0018] The dispersant is selected from one or more of polycarboxylates (TERSPERSE 2700, T36, GY-D06, etc.), lignin sulfonates, polyoxyethylene polyoxypropylene ether block copolymers, alkylnaphthalene formaldehyde condensate sulfonates, alkylphenol polyoxyethylene ether phosphates, fatty alcohol polyoxyethylene ether phosphates, alkylphenol polyoxyethylene ether sulfonates, etc.;

[0019] The emulsifier is selected from fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, alkylphenol polyoxyethylene polyoxypropylene ether, castor oil ethylene oxide adduct and its derivatives, polyoxyethylene polyoxypropylene block copolymer, calcium dodecylbenzene sulfonate; emulsifiers such as BY (castor oil polyoxyethylene ether) series emulsifiers (BY-110, BY-125, BY-140), Nongru 700# (alkylphenol formaldehyde resin polyoxyethylene ether), Nongru 2201, Span-60# (sorbitan monostearate), Tween-60# (sorbitan monostearate polyoxyethylene ether), Nongru 1601# (phenethylphenol polyoxyethylene polyoxypropylene ether), etc. One or more;

[0020] The thickener is selected from one or more of xanthan gum, white carbon black, polyvinyl alcohol, bentonite, magnesium aluminum silicate, sodium alginate, etc.;

[0021] The disintegrant is selected from one or more of sodium sulfate, ammonium chloride, aluminum chloride, ammonium sulfate, sodium sulfate, polyvinyl pyrrolidone, starch or its derivatives, bentonite, etc.;

[0022] The antifreeze agent is selected from one or more of ethylene glycol, propylene glycol, glycerol, urea, inorganic salts such as sodium chloride, etc.;

[0023] The defoamer is selected from C 10 -C 20 Saturated fatty acid compounds, silicone oil, silicone compounds, C8-C 10 One or more of fatty alcohols, etc.;

[0024] The preservative is selected from one or more of sodium propionate, propionic acid, sorbic acid, sodium sorbate, potassium sorbate, benzoic acid, sodium benzoate, sodium p-hydroxybenzoate, methyl p-hydroxybenzoate, etc.;

[0025] The stabilizer is selected from one or more of bentonite, attapulgite, white carbon black, talc, disodium hydrogen phosphate, oxalic acid, succinic acid, adipic acid, borax, 2,6-di-tert-butyl-p-methylphenol, triethanolamine oleate, epoxidized vegetable oil, montmorillonite and starch;

[0026] The binder is selected from one or more of starch, glucose, polyvinyl alcohol, polyethylene glycol, sodium carboxymethyl cellulose, sucrose, etc.;

[0027] The dispersion medium is selected from one or more of soybean oil, rapeseed oil, wheat oil, methyl oleate, diesel, motor oil, mineral oil, etc.;

[0028] The carrier is selected from one or more of ammonium salts, ground natural minerals, ground artificial minerals, silicates, resins, waxes, solid fertilizers, water, organic solvents, mineral oils, vegetable oils, etc.;

[0029] The filler is selected from one or more of ammonium sulfate, urea, sucrose, glucose, diatomaceous earth, kaolin, white carbon black, light calcium, talc, attapulgite, clay and the like.

[0030] Further, the herbicidal composition is in the form of any one of powder, granule, soluble powder, soluble granule, suspension, dispersible oil suspension, aqueous solution, oil, microcapsule suspension, emulsifiable concentrate, water emulsion, wettable powder, water dispersible granule, microemulsion, and soluble solution;

[0031] The preferred dosage form is any one of a dispersible oil suspension, an emulsifiable concentrate, a wettable powder, and a water dispersible granule.

[0032] Furthermore, the composition is a dispersible oil suspension, and the components and contents of the dispersible oil suspension are preferably: 0.1 to 100 parts of active ingredient A, 0.1 to 100 parts of active ingredient B, 1 to 10 parts of wetting agent, 1 to 10 parts of thickener, 1 to 5 parts of stabilizer, 0 to 10 parts of antifreeze agent, and 10 to 80 parts of dispersion medium.

[0033] Dispersible oil suspension has the advantages of small particle size, high suspension rate, good dispersibility, good adhesion, good affinity to the target, strong spreading and adhesion on the plant surface, and resistance to rain erosion. Dispersible oil suspension refers to one or more active ingredients of pesticides (at least one of which is a solid original drug) in a non-aqueous dispersion medium, with the help of additives, through sand mill grinding, the original drug is evenly dispersed in the oil phase to form a highly dispersed, highly suspended, flowable stable liquid-solid system. Dispersible oil suspension consists of active ingredients, wetting agents, thickeners, stabilizers, dispersion media, antifreeze agents, etc.

[0034] Furthermore, the composition is an emulsifiable concentrate, and the components and contents of the emulsifiable concentrate are preferably: 0.1 to 100 parts of active ingredient A, 0.1 to 100 parts of active ingredient B, 0.1 to 20 parts of emulsifier, 0.1 to 5 parts of stabilizer, and 10 to 100 parts of solvent;

[0035] EC is a liquid made by dissolving a high concentration of active ingredients in a solvent and adding an emulsifier. EC is mainly composed of active ingredients, solvents, emulsifiers, stabilizers, etc.

[0036] Furthermore, the composition is a wettable powder, and the components and contents of the wettable powder are preferably: 0.1 to 100 parts of active ingredient A, 0.1 to 100 parts of active ingredient B, 1 to 20 parts of dispersant, 1 to 10 parts of wetting agent, and 10 to 100 parts of filler;

[0037] Wettable powders are preparations that can be evenly dispersed in water. In addition to active substances and inert substances, they also contain a certain amount of anionic or nonionic surfactants. Wettable powders do not use solvents and emulsifiers, are safer for plants, are less likely to cause phytotoxicity, and are safe for the environment. Wettable powders are mainly composed of active ingredients, dispersants, wetting agents, fillers, etc.

[0038] Furthermore, the composition is a water-dispersible granule, and the components and contents of the water-dispersible granule are preferably: 0.1-100 parts of active ingredient A, 0.1-100 parts of active ingredient B, 1-15 parts of dispersant, 1-10 parts of wetting agent, 1-15 parts of disintegrant, 1-10 parts of binder, 0.1-5 parts of defoamer, and 10-100 parts of filler;

[0039] Water dispersible granules are obtained by granulating wettable powders or suspensions into water dispersible granules, mixing the composition with a suitable surfactant and inert material (kaolin, diatomaceous earth, clay) powder in a certain proportion to form a mixture, and then granulating the mixture by fluidized bed granulation, spray granulation or pan granulation. The dosage form has good flowability, is easy to use, has no dust, and is safe and reliable. The main components of water dispersible granules are active ingredients, dispersants, wetting agents, disintegrants, binders, fillers, defoamers, etc.

[0040] The present invention also provides the use of the herbicidal composition as described above for controlling unwanted plants.

[0041] The present invention also provides a method for controlling unwanted plants using the herbicidal composition as described above;

[0042] Further, applying the above-mentioned herbicidal composition to the growth site and / or leaves and / or stems of the unwanted plants;

[0043] Further, the growth site of the unwanted plants is a corn field;

[0044] Further, the unwanted plants are cornfield broadleaf weeds; the cornfield broadleaf weeds are one or more of velvetleaf, amaranth, quinoa, nightshade, amaranth, and chickweed.

[0045] Beneficial effects of the present invention:

[0046] 1) The components of the present invention are reasonable, the weed control effect is good, the cost of the drug is low, and the activity and weed control effect of the compounding thereof within a certain ratio range show a control effect and an activity level that exceeds the superposition of each component, has a significant synergistic effect, can expand the weed control spectrum, improve the control effect, delay resistance, has good safety for crops, and meets the safety requirements of pesticide preparations.

[0047] 2) The herbicidal composition has a long-lasting efficacy and can be applied once to control various weeds in the growing period of corn fields. The components of the composition of the present invention have complementary advantages and have a good control effect on broad-leaved weeds such as velvetleaf, Amaranthus retroflexus, Chenopodium album, Solanum nigrum, Amaranthus oleraceus, and Chickweed in corn fields. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the present invention more concise and clear, the present invention is described with the following specific embodiments, but the present invention is by no means limited to these embodiments. The embodiments described below are only preferred embodiments of the present invention, which can be used to describe the present invention and cannot be understood as limiting the scope of the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0049] Preparation implementation case

[0050] In order to better illustrate the present invention, the present invention is further described below in conjunction with embodiments.

[0051] Preparation Example 1: 20% metsulfuron-methyl·pyrasulfuron dispersible oil suspension (1:3)

[0052] Formula: 5% metsulfuron-methyl, 15% fluazifop-butyl, 2% sodium polycarboxylate, 4% NongRu 1601#, 3% Tween-60#, 4% NongRu 2201, 1% sodium alkyl sulfate, 0.5% bentonite, 5% propylene glycol, and soybean oil to make up the balance;

[0053] Preparation method: According to the formula ratio, the active ingredients metsulfuron-methyl, flumetsulam, surfactants and other functional additives are placed in a reactor in sequence, oil is added and mixed evenly, and the suspension product is obtained by high-speed shearing, wet sand grinding, and finally homogenous filtration.

[0054] Preparation Example 2: 14% methicillin-methyl·pyrasulfuron EC (1:6)

[0055] Formula: 2% flumetsulam methyl, 12% flumetsulam, 10% dimethyl sulfoxide, 5% fatty alcohol polyoxyethylene ether, 9% alkylphenol polyoxyethylene polyoxypropylene ether, 1% calcium dodecylbenzene sulfonate, and methyl oleate makes up the balance;

[0056] Preparation method: Add the active ingredients methicillin-methyl and flumetsulam into a carrier according to the formula ratio of the example, add a surfactant and other functional additives thereto, stir and mix them evenly in a stirring mixing kettle to obtain an emulsifiable concentrate product.

[0057] Preparation Example 3: 30% metsulfuron-methyl·pyrasulfuron wettable powder (1:2)

[0058] Formula: 10% flumet-methyl, 20% flumet-methyl, 5% alkylnaphthalene formaldehyde condensate calcium sulfonate, 6% alkylphenol polyoxyethylene ether sodium sulfonate, 3% alkylnaphthalene sodium sulfonate, 5% talc, diatomaceous earth to make up the balance;

[0059] Preparation method: According to the formula ratio of the embodiment, the active ingredients methicillin-methyl and flumetsulam are added to the carrier, and surfactants and other functional additives are added thereto, mixed, and then air flow pulverized and mixed again to obtain a wettable powder product.

[0060] Preparation Example 4: 55% metsulfuron-methyl·pyrasulfuron water dispersible granules (1:10)

[0061] Formula: 5% metsulfuron-methyl, 50% fluazifop-butyl, 3% polycarboxylate GY-D06, 4% sodium lauryl sulfate, 1% sodium alkyl sulfonate, 2% sucrose, clay makes up the balance;

[0062] Preparation method: According to the formula ratio of the embodiment, the active ingredients of metsulfuron methyl and flumetin are added to the carrier, and surfactants and other functional additives are added thereto, mixed, and 10-25% of water is added after air flow pulverization, and then kneading, granulation, drying and sieving are carried out to obtain a water-dispersible granule product.

[0063] Preparation Example 5: 40% fluazifop-methyl·pyrasulfuron dispersed oil suspension (1:7)

[0064] Formula: 5% metsulfuron-methyl, 35% fluazifop-butyl, 5% sodium polycarboxylate, 5% NongRu 1601#, 2% Tween-60#, 4% NongRu 2201, 0.8% alkyl sulfonate, 0.5% bentonite, 5% ethylene glycol, and rapeseed oil to make up the balance;

[0065] Preparation method: According to the formula ratio, the active ingredients metsulfuron-methyl, flumetsulam, surfactants and other functional additives are placed in a reactor in sequence, oil is added and mixed evenly, and the suspension product is obtained by high-speed shearing, wet sand grinding, and finally homogenous filtration.

[0066] Indoor Activity Assay Example

[0067] Example 6: Combined effects of a herbicidal composition containing metsulfuron-methyl and flumetsulam on common weeds

[0068] In order to further understand the combined action type of the compound herbicidal composition on weeds, the inventors conducted indoor formula screening tests on the compound composition. The herbicidal activity of the different ratios of the composition and the single agent was compared by the greenhouse pot method activity assay test. The specific test is based on: NY / T 1155.4-2006 "Pesticide Indoor Bioassay Test Guidelines Activity Assay Test Stem Leaf Spray Method" and NY / T1155.7-2006 "Pesticide Indoor Bioassay Test Guidelines Mixed Combined Action Determination".

[0069] Test targets: Chenopodium album and Amaranthus tricolor.

[0070] Test agents: 95% metsulfuron methyl technical, 97% fluazifop technical, the above technicals are provided by the R&D center of Hailier Pharmaceutical Group Co., Ltd.

[0071] Preparation of the agent: Accurately weigh a certain mass of metsulfuron-methyl and flumetsulam technical drugs, dissolve the technical drugs with DMF, and dilute with 0.1% Tween 80 aqueous solution, and prepare 5 series of mass concentrations according to the equal ratio method for use.

[0072] Stem and leaf spray method: Fill a plastic pot with a certain amount of soil in a 7cm high and 9cm diameter, sow 15 to 20 target weed seeds in the plastic pot, cover with 0.5 to 2cm of fine soil and place in a greenhouse for cultivation. After the weeds emerge, thin out the seedlings and determine the plants to ensure the density of the weeds is consistent. When the weeds grow to 2 to 4 leaves, spray the stems and leaves. Repeat 4 times for each treatment, and set a treatment without the drug as a blank control. After treatment, let the drug solution on the surface of the test material dry naturally and move it to the greenhouse for routine cultivation. After treatment, move it to the greenhouse for routine cultivation and replenish water by infiltration irrigation at the bottom of the pot.

[0073] 14 days after treatment, the fresh weight weed control effect of each treatment was investigated. Based on the investigation data, the fresh weight control effect of each treatment was calculated according to the following formula, and the unit is percentage (%):

[0074] The evaluation method for the combined action type of the active combination is as follows:

[0075] Gowing method evaluation, Gowing method is a method for evaluating the combined action type of herbicides mixed proposed in 1960. The specific steps are to first determine the control effect of single agent and mixture on target weeds, calculate the theoretical control effect of the mixture through the measured control effect of single agent, and then compare it with the measured control effect of the mixture to evaluate the combined action type.

[0076] Weed fresh weight control effect (E) % = [(weed fresh weight in blank area - weed fresh weight in control area) / weed fresh weight in blank area] × 100

[0077] Theoretical fresh weight inhibition rate (E0)% of the mixed herbicide = fresh weight inhibition rate of weeds by compound A at a dosage of P + fresh weight inhibition rate of weeds by compound B at a dosage of Q - (fresh weight inhibition rate of weeds by compound A at a dosage of P × fresh weight inhibition rate of weeds by compound B at a dosage of Q) / 100;

[0078] Evaluation criteria for the combined effects of mixed drugs:

[0079] When E-E0>10%, it means that the mixed herbicide has a synergistic effect; when E-E0<-10%, it means that the mixed herbicide has an antagonistic effect; when the E-E0 value is between ±10%, it means that the mixed herbicide has an additive effect. In the formula, E represents the actual control efficiency of each treatment.

[0080] The results showed that, as shown in Table 1, flumetin-methyl and flumetin-methyl alone and in combination showed high herbicidal activity against Chenopodium album. Flumetin-methyl at 10 g / hm 2 The measured control efficiency is 65.59%, pyrasulfuron 50g / hm 2 The measured control efficiency was 55.46%. The combination of metsulfuron-methyl and flumetsulam produced an additive or synergistic effect on Chenopodium album, and 2+10 (1:5), 2+20 (1:10), 2+40 (1:20), 4+20 (1:5), 4+40 (1:10), 6+20 (3:10), 6+40 (3:20), and 6+50 (3:25) all showed synergistic effects.

[0081] As shown in Table 2, flumetin-methyl and flumetin-methyl alone and in combination showed high herbicidal activity against Amaranthus tricolor. Flumetin-methyl at 10 g / hm 2 The measured control efficiency is 65.62%, pyrasulfuron 50g / hm 2 The measured control efficiency was 51.00%. The combination of metsulfuron-methyl and fluazifop-butyl produced an additive or synergistic effect on Amaranthus tricolor, and 2+20 (1:10), 2+30 (1:15), 6+30 (1:5), 6+40 (3:20), 8+30 (4:15), and 8+40 (1:5) all showed synergistic effects.

[0082] The measured control efficacy (E) of the mixture of metsulfuron-methyl and flumetsulam on Chenopodium album and Amaranthus tricolor was mostly greater than the theoretical control efficacy (E0), and the values ​​of some ratios (E-E0) were greater than 10%, and the type of combined action of the two was synergistic; the values ​​of the remaining ratios E-E0 were all between ±10%, and the type of combined action of the two was additive. It can be seen that the weed control efficacy of metsulfuron-methyl and flumetsulam after mixing was higher than that of the two single agents, and the herbicidal activity was improved. The combined action types of the two mixtures were synergistic and additive.

[0083] Table 1 The results of the combined effects of metsulfuron-methyl, flumetsulam and their mixture on Chenopodium album

[0084]

[0085]

[0086] Table 2 The combined effects of metsulfuron-methyl, fluazifop-butyl and their mixture on Amaranthus chinensis

[0087]

[0088]

[0089] Field efficacy test

[0090] Example 7 Field efficacy test of metsulfuron-methyl and flumetsulam in controlling weeds in corn fields

[0091] It can be seen from Tables 1 and 2 that the combined effect of metsulfuron-methyl and flumetsulam is additive or synergistic in corn fields. Based on the combined effect data, it can be predicted that their mixture will also have a good preventive effect in the field.

[0092] The test was conducted in accordance with GB / T 17980.42-2004 “Guidelines for Field Efficacy Tests of Pesticides (I) Part 42: Herbicides for Control of Weeds in Corn Fields”.

[0093] Test agents: 20% metsulfuron-methyl·pyrasulfuron dispersible oil suspension; 14% metsulfuron-methyl·pyrasulfuron emulsifiable concentrate; 30% metsulfuron-methyl·pyrasulfuron wettable powder; 55% metsulfuron-methyl·pyrasulfuron water dispersible granules; 40% metsulfuron-methyl·pyrasulfuron dispersible oil suspension;

[0094] Control agents: 5% fluazifop-methyl emulsifiable concentrate; 80% fluazifop-butyl water dispersible granules.

[0095] Experimental treatment: The different treatment plots of the experiment were arranged in random blocks, with a plot area of ​​30m 2 , repeat 4 times.

[0096] Application method: Use stem and leaf spray method, apply the pesticide after the corn seedlings in the corn field, and apply the pesticide once.

[0097] Dosage:

[0098] Table 3 Statistics of pesticide dosage in field trials

[0099] Serial number Chemical treatment <![CDATA[Dosage g a.i. / hm 2 > 1 20% metsulfuron-methyl·pyrasulfuron dispersible oil suspension (1:3) 20 2 14% metsulfuron-methyl·pyrasulfuron EC (1:6) 20 3 30% metsulfuron-methyl·pyrasulfuron wettable powder (1:2) 20 4 55% metsulfuron-methyl·pyrasulfuron water dispersible granules (1:10) 20 5 40% fluazifop-methyl·pyrasulfuron dispersible oil suspension (1:7) 20 6 5% methicillin-methyl EC 10 7 80% Sulfamyl Water Dispersible Granules 60 8 Clear water control /

[0100] Experimental investigation and safety observation: Baseline investigation, observation of the effects of each treatment agent on corn growth for 10 days before application (for the growth period of weed species and the distribution percentage of major weeds) and after application, and investigation twice at 15 and 30 days after application. Each plot was randomly selected with a 0.25-1m 2 Three to four squares were sampled for investigation to check the number of remaining weeds and to see if there were any safety issues for the crops.

[0101] Calculation method of control effect:

[0102] Plant protection effect (%) = (number of plants in the blank area - number of plants in the treated area) / number of plants in the blank area × 100

[0103] The main weeds in the experimental field are annual broad-leaved weeds such as Amaranthus retroflexus, Chenopodium album, Ramie, and Amaranthus tricolor.

[0104] The protective effect was calculated according to the above formula, and the significance analysis was performed using the new multiple range method.

[0105] Crop survey: observe whether the pesticide has any damage to corn, record the type and degree of the damage, and grade and score the damage in each plot according to the method of pesticide grading;

[0106] Level 1: Corn grows normally without any damage symptoms;

[0107] Level 2: Corn is slightly damaged by pesticides, with damage less than 10%;

[0108] Level 3: Moderate damage to corn, which can be recovered later and does not affect yield;

[0109] Level 4: The corn is severely damaged by pesticides and is difficult to recover, resulting in reduced yield;

[0110] Level 5: Corn is severely damaged by pesticides and cannot recover, resulting in a significant reduction in yield or even a total loss of yield.

[0111] At the same time, accurately describe the symptoms of corn pesticide damage and record the growth status of corn under all circumstances.

[0112] Results and Analysis

[0113] Table 4 Control effect of metsulfuron-methyl and flumetol-methyl mixture on annual broadleaf weeds in corn fields

[0114]

[0115] Note: The protective effects in the above table refer to the overall protective effects. Capital letters represent extremely significant differences at the 1% level, and lowercase letters represent significant differences at the 5% level.

[0116] The biostatistical analysis method used was the Duncan's new multiple range (DMRT) method.

[0117] According to Table 4, it can be seen that the plant protection efficacy of 20% methamphetamine-methyl·metamifloxacin dispersible oil suspension, 14% methamphetamine-methyl·metamifloxacin emulsifiable concentrate, 30% methamphetamine-methyl·metamifloxacin wettable powder, 55% methamphetamine-methyl·metamifloxacin water-dispersible granules and 40% methamphetamine-methyl·metamifloxacin dispersible oil suspension were all above 85% 15 days after treatment; the plant protection efficacy of 14% methamphetamine-methyl·metamifloxacin emulsifiable concentrate was as high as 93.25%, showing a relatively high protection efficacy.

[0118] As time went by, the control efficacy of each compound agent was above 90% 30 days after application, the control efficacy of 5% flumetinol emulsifiable concentrate was 76.62%, and the control efficacy of 80% flumetinol water-dispersible granules was 60.53%. There were significant differences between each compound agent and the control agents 5% flumetinol emulsifiable concentrate and 80% flumetinol water-dispersible granules at the 0.01 and 0.05 levels.

[0119] Table 5 Safety statistics of corn field trials

[0120] Experimental Drugs <![CDATA[Effective dosage g a.i. / hm 2 > Record of corn pesticide damage level in each plot 20% metsulfuron-methyl·pyrasulfuron dispersible oil suspension (1:3) 20 Level 1, Level 1, Level 1, Level 1 14% metsulfuron-methyl·pyrasulfuron EC (1:6) 20 Level 1, Level 1, Level 1, Level 1 30% metsulfuron-methyl·pyrasulfuron wettable powder (1:2) 20 Level 1, Level 2, Level 1, Level 1 55% metsulfuron-methyl·pyrasulfuron water dispersible granules (1:10) 20 Level 1, Level 1, Level 1, Level 1 40% fluazifop-methyl·pyrasulfuron dispersible oil suspension (1:7) 20 Level 1, Level 1, Level 1, Level 1 5% methicillin-methyl EC 10 Level 1, Level 1, Level 1, Level 1 80% Sulfamyl Water Dispersible Granules 60 Level 1, Level 1, Level 2, Level 1

[0121] Safety investigation: Observation during the trial, 80% flumetrazol water dispersible granules 60g ai / hm 2 One plot in the treatment area had slight phytotoxicity to corn, but the phytotoxicity was less than 10%. One plot in the treatment area of ​​30% metsulfuron-methyl·pyrasulfuron WP (1:2) had a safety level of 2, and the phytotoxicity recovered in the later growth process; the other treatments were safe for corn growth, and no phytotoxicity occurred. After 21 days of observation, corn in each plot grew normally, with no obvious phytotoxicity symptoms, and was safe for corn.

[0122] In summary, the composition of the present invention is a compound of two active ingredients, and its prevention effect and activity level exceed the sum of the components. Compared with the existing single preparations, it has a significant synergistic weed control effect, obvious synergistic effect, can delay resistance, reduce the amount of preparation residues, has no pollution to crops, has good safety, and can meet the current agricultural production, especially the demand for herbicides in corn planting.

Claims

1. A use of a herbicidal composition containing metsulfuron-methyl and flumetsulam for controlling Chenopodium album and Amaranthus tricolor in corn fields, characterized in that: The composition comprises an active ingredient A and an active ingredient B, wherein the active ingredient A is flumet-methyl and the active ingredient B is flumet-methyl; When it is Chenopodium album, the dosage of fluthiacet-methyl is 2g / hm 2 The weight ratio of flumet-methyl to flumet-sulfuron is 2:10, 2:20, 2:40, and the dosage of flumet-methyl is 4 g / hm 2 The weight ratio of flumet-methyl to flumet-sulfuron is 4:20, 4:40, and the dosage of flumet-methyl is 6 g / hm 2 The weight ratio of flumet-methyl to flumet-sulam is 6:20, 6:40, and 6:50; When it is Amaranthus tricolor: the dosage of fluthiacet-methyl is 2g / hm 2 The weight ratio of flumet-methyl to flumet-sulfuron is 2:20, 2:30, and the dosage of flumet-methyl is 6 g / hm 2 The weight ratio of flumet-methyl to flumet-sulfuron is 6:30, 6:40, and the dosage of flumet-methyl is 8 g / hm 2 The weight ratios of flumet-methyl and flumet-sulam are 8:30 and 8:

40.

2. The use according to claim 1, characterized in that: The total weight percentage of the active ingredient A and the active ingredient B in the composition is 5% to 95%.

3. The use according to claim 1, characterized in that: The total weight percentage of the active ingredient A and the active ingredient B in the composition is 10% to 90%.

4. The use according to claim 1, characterized in that: The herbicidal composition further comprises an adjuvant, which is selected from one or more of a solvent, a wetting agent, a dispersant, an emulsifier, a thickener, a disintegrant, an antifreeze agent, a defoaming agent, a preservative, a stabilizer, a binder, a carrier, and a filler.

5. The use according to claim 1, characterized in that: The herbicidal composition is in the form of any one of powder, granule, soluble powder, soluble granule, suspension, dispersible oil suspension, aqueous solution, microcapsule suspension, emulsifiable concentrate, water emulsion, wettable powder, water dispersible granule, microemulsion and soluble solution.

6. The use according to claim 1, characterized in that: The herbicidal composition is in the form of any one of a dispersible oil suspension, an emulsifiable concentrate, a wettable powder and a water-dispersible granule.

7. The use according to claim 1, characterized in that The herbicidal composition is applied to the growth site and / or to the leaves and / or stems of the unwanted plants.

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