A herbicidal composition and its application

Abstract

The present invention belongs to the field of pesticides, and particularly relates to a herbicidal composition and its application. The herbicidal composition comprises an active ingredient A and an active ingredient B in an effective herbicidal amount, wherein the active ingredient A is, and the active ingredient B is selected from one or more of the following compounds: pyroxasulfone, acetochlor, butachlor, propisochlor, S-metolachlor, pendimethalin and metamitron. This composition can effectively control various weed problems in the strip intercropping fields of corn and soybean, has high safety and good selectivity for crops, and has the characteristics of expanding the herbicidal spectrum, reducing the application amount, being able to produce a synergistic effect and solving resistant weeds, etc.

Description

Technical Field

[0001] The present invention belongs to the field of pesticides, and particularly relates to a weeding composition and its application. Background Art

[0002] Chemical weeding is the most economical and effective means for controlling farmland weeds. However, long-term continuous high-dose use of a single chemical herbicide variety or a single mode of action is likely to cause problems such as weed drug resistance and resistance evolution. The reasonable compounding or mixing of herbicide compounds has advantages such as expanding the weed spectrum, improving the control effect, delaying the occurrence and development of weed drug resistance and resistance, etc., and is one of the most effective methods to solve the above problems. There is still a need in production to develop weeding composition varieties with high safety, broad herbicidal spectrum, capable of producing synergistic effects and solving resistant weeds. Summary of the Invention

[0003] To solve the above problems existing in the prior art, the present invention provides a weeding composition and its application. This composition can effectively control various weed problems in the strip intercropping fields of corn and soybean, has high safety and good selectivity for crops, and has characteristics such as expanding the herbicidal spectrum, reducing the application amount, being able to produce synergistic effects and solving resistant weeds.

[0004] A weeding composition, characterized in that it comprises an effective weeding amount of active ingredient A and active ingredient B, wherein active ingredient A is Active ingredient B is selected from one or more of the following compounds: sulfentrazone (CAS: 447399-55-5), acetochlor (CAS: 34256-82-1), butachlor (CAS: 23184-66-9), propisochlor (CAS: 86763-47-5), S-metolachlor (CAS: 87392-12-9), pendimethalin (CAS: 40487-42-1) and metamitron (CAS: 21087-64-9).

[0005] When active ingredient B is sulfentrazone, the weight ratio of A to B in the weeding composition is 4.5:1 to 15:1, preferably 5:1 to 10:1, more preferably 5.5:1 to 9:1;

[0006] When active ingredient B is acetochlor, butachlor, S-metolachlor or pendimethalin, the weight ratio of A to B in the weeding composition is 0.75:1 to 10:1, preferably 1:1 to 5:1, more preferably 1.5:1 to 3:1;

[0007] When active ingredient B is propisochlor, the weight ratio of A to B in the weeding composition is 1:10 to 10:1, preferably 1:5 to 5:1, more preferably 1:3 to 1:1;

[0008] When the active ingredient B is metribuzin, the weight ratio of A to B in the herbicidal composition is 1.8:1 to 10:1, preferably 2:1 to 5:1, more preferably 2:1 to 4:1.

[0009] The mass percentage content of A and B in the herbicidal composition accounts for 1-95% of the total amount, preferably 10-80%.

[0010] The herbicidal composition further comprises conventional auxiliaries, and the conventional auxiliaries include carriers and / or surfactants.

[0011] The term "carrier" in this text refers to an organic or inorganic, natural or synthetic substance. They facilitate the application of the active ingredient, and the carrier is generally inert and must be agriculturally acceptable, especially acceptable to the plants to be treated. The carrier can be solid, such as clay, natural or synthetic silicate, silica, resin, wax, solid fertilizer, etc.; or liquid, such as water, alcohols, ketones, petroleum fractions, aromatic hydrocarbons or paraffinic hydrocarbons, chlorinated hydrocarbons, liquefied gases, etc.

[0012] Surfactants can include emulsifiers, dispersants or wetting agents, and they can be ionic or non-ionic. Examples that can be mentioned are salts of polyacrylic acid, lignosulfonates, salts of phenolsulfonic acid or naphthalenesulfonic acid, polymers of ethylene oxide with aliphatic alcohols or with aliphatic acids or with aliphatic amines and substituted phenols (especially alkylphenols or arylphenols), sulfosuccinates, taurine derivatives (especially alkyl taurates) and phosphates of alcohols or polyhydroxyethylated phenols, alkyl sulfonates, alkyl aryl sulfonates, alkyl sulfates, lauryl ether sulfates, fatty alcohol sulfates, and sulfated hexadecane-, heptadecane- and octadecane alcohols as well as sulfated fatty alcohol ethylene glycol ethers. In addition, there are condensates of naphthalene or naphthalenesulfonic acid with phenol and formaldehyde, polyoxyethylene octylphenyl ether, ethoxylated isooctylphenol, octylphenol or nonylphenol, alkylphenyl polyethylene glycol ether, tributylphenyl polyethylene glycol ether, tristearylphenyl polyethylene glycol ether, alkylaryl polyether alcohols, alcohols and fatty alcohol / ethylene oxide condensates, ethoxylated castor oil, polyoxyethylene alkyl ethers, ethoxylated polypropylene oxide, lauryl alcohol polyethylene glycol ether acetal, sorbitol esters, lignosulfite waste liquor, and proteins, denatured proteins, polysaccharides (such as methylcellulose), hydrophobically modified starches, polyvinyl alcohols, polycarboxylates, polyalkoxylates, polyvinylamines, polyvinylpyrrolidones and their copolymers. At least one surfactant is required to facilitate the dispersion of the active ingredient in water and to enable them to be correctly applied to plants.

[0013] The above compositions may also contain various other components, such as protective colloids, binders, thickeners, thixotropic agents, penetrants, stabilizers, chelating agents, dyes, colorants and polymers.

[0014] The herbicidal composition further comprises at least one safener, preferably one or more of isoxadifen-ethyl (CAS: 163520-33-0), cyprosulfamide (CAS: 221667-31-8), pyraclonil (CAS: 135590-91-9), cloquintocet-mexyl (CAS: 99607-70-2), gibberellic acid (CAS: 7-06-5), furilazole (CAS: 121776-33-8), metcamifen (CAS: 129531-12-0).

[0015] The composition of the present invention can be diluted by the user before use or used directly. Its formulation can be prepared by conventional processing methods, that is, after mixing the active substance with a liquid solvent or a solid carrier, one or several of surfactants such as dispersants, stabilizers, wetting agents, binders, defoaming agents, etc. are added.

[0016] The specific formulations of the herbicidal composition are dispersible oil suspensions, aqueous suspensions, suspoemulsions, wettable powders, emulsifiable concentrates, water-dispersible granules (dry suspensions), emulsions in water, microemulsions.

[0017] In short, the composition of the present invention can be mixed with solid and liquid additives commonly used in the prior art formulations. With the change of external conditions, the usage amount of the active ingredient also varies. The external conditions are, for example, temperature, humidity, the nature of the herbicide used, etc. It can have a large range of variations, for example, between 0.001 and 1.0 kg / ha, or more of the active substance, but preferably between 0.005 and 750 g / ha, especially between 0.005 and 500 g / ha.

[0018] In the context of this specification, if an abbreviation of the common name of an active compound is used, it includes in each case all conventional derivatives, such as esters and salts, as well as isomers, especially optical isomers, especially one or more commercially available forms. If the common name represents an ester or a salt, it also includes in each case all other conventional derivatives, such as other esters and salts, free acids and neutral compounds, as well as isomers, especially optical isomers, especially one or more commercially available forms. The chemical names of the compounds given represent at least one compound covered by the common name, usually the preferred compound. In the case of sulfonamides such as sulfonylureas, salts also include salts formed by the exchange of a cation for a hydrogen atom in the sulfonamide group. For example, MCPA derivatives include, but are not limited to: MCPA sodium salt, potassium salt, dimethylammonium salt, isopropylammonium salt, etc., and MCPA methyl ester, ethyl ester, isooctyl ester, ethyl thioester, etc.; 2,4-D derivatives include, but are not limited to: 2,4-D salts such as sodium salt, potassium salt, dimethylammonium salt, triethanolammonium salt, isopropylammonium salt, choline, etc., and 2,4-D esters such as methyl ester, ethyl ester, butyl ester, isooctyl ester, etc.

[0019] The present invention also provides an application of the herbicidal composition in controlling weeds; and provides a method for controlling the growth of unwanted plants, which includes applying the herbicidal composition to plants, plant parts, plant seeds or the areas where plants grow.

[0020] In addition, the composition of the present invention can be applied to the leaves of plants to be treated by spraying, that is, applied to weeds, especially on the surfaces invaded or liable to be invaded by weeds.

[0021] When applying the herbicidal composition of the present invention, unexpected synergistic effects are obtained, and the herbicidal activity is more significant than the expected sum of the activities of using individual herbicides and the activities of individual herbicides. The synergistic effects are manifested as reduced application rates, a wider weed control spectrum, faster and more persistent herbicidal effects, and these characteristics are required in the process of weed control practice. In terms of the described characteristics, these new compositions are significantly superior to existing herbicides, achieving reduced usage and being more environmentally friendly.

[0022] The synergistic herbicidal composition of the present invention also has the following advantages:

[0023] (1) The composition of the present invention is environmentally friendly and is easily degraded in the environment.

[0024] (2) The herbicidal composition of the present invention has a low cost and is convenient to use, and its popularization and application have great economic and social benefits.

[0025] All patents, patent applications and publications mentioned or cited herein are incorporated herein by reference in their entirety to the same extent as if each were individually cited. Detailed embodiments

[0026] The following examples do not limit the present invention, but are only used to illustrate how the present invention is implemented. For certain weeds, these examples show particularly significant effectiveness. Examples are as follows:

[0027] A) Examples

[0028] 1. A + pyroxasulfone (36 + 6) aqueous suspension concentrate

[0029] 36% A + 6% pyroxasulfone + 5% polycarboxylate dispersant + 3% block polyether dispersant + 2% fatty alcohol polyoxyethylene ether + 0.08% xanthan gum + 3% ethylene glycol + 0.1% defoamer, made up with deionized water

[0030] 2. A + acetochlor (40 + 20) emulsifiable concentrate

[0031] 40% A + 20% acetochlor + 4.5% calcium dodecylbenzenesulfonate + 4% cardanol polyoxyethylene ether + 2% block polyether emulsifier + 15% benzyl alcohol, made up with 180# solvent oil

[0032] 3. EC of A + butachlor (40 + 20)

[0033] 40% A + 20% butachlor + 5% calcium dodecylbenzenesulfonate + 5% cardanol polyoxyethylene ether + 3% block polyether emulsifier + 15% benzyl alcohol, made up with 180# solvent oil

[0034] 4. EC of A + S - metolachlor (15 + 45)

[0035] 15% A + 45% S - metolachlor + 5% calcium dodecylbenzenesulfonate + 8% cardanol polyoxyethylene ether + 3% block polyether emulsifier, made up with 180# solvent oil

[0036] 5. EC of A + S - metolachlor (40 + 20)

[0037] 40% A + 20% S - metolachlor + 5% calcium dodecylbenzenesulfonate + 6% cardanol polyoxyethylene ether + 1.6% block polyether emulsifier + 15% benzyl alcohol, made up with 180# solvent oil

[0038] 6. SC of A + pendimethalin (30 + 20)

[0039] 30% A + 20% pendimethalin + 4% polycarboxylate dispersant + 2% block polyether dispersant + 3% fatty alcohol polyoxyethylene ether + 0.06% xanthan gum + 3% ethylene glycol + 1% fumed silica + 0.1% defoamer, made up with deionized water

[0040] 7. SC of A + metribuzin (34 + 16)

[0041] 34% A + 16% metribuzin + 4% polycarboxylate dispersant + 2% block polyether dispersant + 3% fatty alcohol polyoxyethylene ether + 0.06% xanthan gum + 3% ethylene glycol + 0.1% defoamer, made up with deionized water

[0042] The above - mentioned EC processing equipment: mixing kettle, storage tank, etc.

[0043] The above - mentioned EC processing process: Put all materials into the mixing kettle, stir and mix until all materials are completely dissolved. After passing the inspection, transfer them to the storage tank for filling.

[0044] The above - mentioned SC processing equipment: mixing kettle, colloid mill, sand mill, shearing machine, etc.

[0045] The above water suspension concentrate processing procedure: Put all the materials into a mixing kettle, stir and mix them, then pass through a colloid mill, and then enter a sand mill for three-stage sanding. Finally, shear them evenly in a shearing machine. After passing the chemical examination, transfer them to a storage tank for filling.

[0046] B) Efficacy test

[0047] Soil sealing treatment:

[0048] 1) Test conditions

[0049] 1.1), Cultivation conditions

[0050] Carry out in a controllable sunlight greenhouse, with a temperature of 20 - 30 °C, natural light, and a relative humidity of 57% - 72%.

[0051] The soil type is loam, with an organic matter content of 1.63%, pH = 7.1, available nitrogen of 84.3 mg / kg, available phosphorus of 38.5 mg / kg, and available potassium of 82.1 mg / kg. Quantitatively fill the test soil to 3 / 4 of the pot, and then irrigate from the bottom of the pot to make the soil completely wet to the saturated state. The test weed seeds are germinated until they show white tips, and then evenly and quantitatively sown on the surface. Cover the soil with 0.5 - 1 cm according to the seed size. Keep them for use 72 hours after sowing.

[0052] 1.2), Instrument and equipment

[0053] GA10 type one-ten-thousandth electronic balance (Germany); ZDR2000 intelligent data recorder (Hangzhou Zeda Instrument Co., Ltd.); SPX type intelligent biochemical incubator (Ningbo Jiangnan Instrument Factory), pipette, etc.

[0054] 2) Test design

[0055] 2.1), Reagents

[0056] 2.1.1), Test agents

[0057] The required active ingredient A is synthesized with reference to Patent US1105357 ( 1 H NMR(500MHz,DMSO-d6)δ7.81(d,J = 2.0Hz,1H),7.48–7.55(m,1H),7.41(d,J = 8.5Hz,1H),4.72(s,2H),4.07(s,2H),1.16(s,6H).); The required active ingredient B is purchased from a reagent company. The technical drugs all use acetone as the solvent and are diluted with a 0.1% emulsifier Tween-80 aqueous solution, diluted as needed for immediate use.

[0058] 2.2), Test treatments

[0059] 2.2.1), Dose setting

[0060] When determining the proportion or content of each component of A and the active ingredient B, it should be measured from the action characteristics and toxicity of the two agents, and the main purpose of using this formulation should also be considered. Based on the preliminary pre-tests in this study, the single and mixed dosages of the active ingredients A and B are shown in the table respectively. Water containing no agent, the same solvent and emulsifier is used as the blank control.

[0061] 2.2.2) Test replication

[0062] Each treatment is replicated 4 times. Each time, there are 3 pots for each treatment, and 20 weed seeds are sown in each pot.

[0063] 2) Test method

[0064] Irrigate before treatment to maintain a water layer of 1 - 2 cm. Use a pipette to take a quantitative amount of the liquid medicine, and conduct irrigation treatments separately from low dose to high dose according to the test design, with 4 replicates for each treatment; after treatment, transfer it to the greenhouse for conventional cultivation, and always maintain a water layer of 1 - 2 cm during the test period.

[0065] 3) Data investigation and statistical analysis

[0066] 3.1) Investigation method

[0067] The absolute number investigation method is adopted. Use a blade to cut off the whole seedlings of the surviving weeds along the soil surface, and weigh the fresh weight of the weeds with an analytical balance. For the weeds that have died, count their fresh weight as zero.

[0068] 3.2) Investigation time and frequency

[0069] Investigate 21 days after treatment, with a total of 1 investigation.

[0070] 3.3) Data statistical analysis

[0071] Use the Gowing method to calculate the theoretical fresh weight inhibition rate (E0 = X + Y - X * Y / 100) of each treatment mixture combination, and then compare it with the measured inhibition rate (E) to evaluate the type of joint action of the two when mixed. When the value of E - E0 is greater than 10% it is a synergistic effect, less than -10% it is an antagonistic effect, and between -10% and 10% it is an additive effect. And determine the optimal ratio according to factors such as the actual control effect, the characteristics of the herbicide, and the balance of the formulation. In the formula, X is the fresh weight inhibition rate when the dosage of the active ingredient A is P; Y is the fresh weight inhibition rate when the dosage of the active ingredient B is Q.

[0072] Table 1 Actual control effect and evaluation of joint action of A mixed with pyroxasulfone on barnyardgrass

[0073]

[0074] Table 2 Actual control effect and evaluation of joint action of A mixed with acetochlor on barnyardgrass

[0075]

[0076] Table 3 Evaluation of the actual control effect and combined action of A mixed with butachlor against Echinochloa crusgalli

[0077]

[0078] Table 4 Evaluation of the actual control effect and combined action of A mixed with isoproturon against Echinochloa crusgalli

[0079]

[0080]

[0081] Table 5 Evaluation of the actual control effect and combined action of A mixed with S-metolachlor against Echinochloa crusgalli

[0082]

[0083] Table 6 Evaluation of the actual control effect and combined action of A mixed with pendimethalin against Echinochloa crusgalli

[0084]

[0085] Table 7 Evaluation of the actual control effect and combined action of A mixed with metribuzin against Echinochloa crusgalli

[0086]

[0087] C) Field demonstration

[0088] The weed control effect test in the maize-soybean strip intercropping field was carried out using the herbicidal compositions prepared in Examples 1-7 above. The main weeds in the field were: Digitaria sanguinalis, Echinochloa crusgalli, Eleusine indica, Portulaca oleracea, etc.

[0089] Test method:

[0090] Soil treatment (S): Before weed germination, use a manual sprayer with a water application rate of 45 kg / 667 m2, and evenly spray on the soil surface.

[0091] For the specific test agents and dosages, see Table 8. The plot area was 20 square meters, and each treatment was repeated 3 times. The control effect was investigated 20 days after spraying, as shown in Table 8.

[0092]

[0093] Field demonstration effect of the compound composition described in Table 8

[0094]

[0095] After a large number of experiments and explorations, the present invention unexpectedly discovers that the said composition is used for controlling mainly gramineous weeds, broad-leaved weeds and cyperaceae weeds, etc., and has a surprising and unexpected synergistic effect. This synergistic effect is more remarkable at low doses, can reduce the dosage of pesticides, reduce environmental pollution, and reasonably compounding reduces the agricultural cost, having a very good application prospect. At the same time, through testing, it shows good selectivity and excellent synergistic effect in plants such as wheat fields, corn fields, rice fields, peanuts, sugar canes, sorghums, foxtail millet, potatoes, rapeseeds, soybeans, cottons, vegetables, bluegrasses, tall fescues, zoysiagrasses, etc., and can be developed into a herbicide mixture with broad market value.

Claims

1. A herbicidal composition, characterized in that, Comprising a herbicidally effective amount of active ingredient A and active ingredient B, wherein active ingredient A is Active ingredient B is selected from one of the following compounds: pyraflufen-ethyl, acetochlor, butachlor, metolachlor, S-metolachlor, pendimethalin, and metamitron, When the active ingredient B is pyroxasulfone, the weight ratio of A to B in the herbicidal composition is 5.5:1 to 9:1; When the active ingredient B is acetochlor, butachlor, S-metolachlor, or pendimethalin, the weight ratio of A to B in the herbicidal composition is 1.5:1 to 3:1; When the active ingredient B is propisochlor, the weight ratio of A to B in the herbicidal composition is 1:3 to 1:1; When the active ingredient B is metribuzin, the weight ratio of A to B in the herbicidal composition is 2:1 to 4:

1.

2. The herbicidal composition according to claim 1, wherein The mass percentage content of A and B in the herbicidal composition accounts for 1-95% of the total amount.

3. The herbicidal composition according to claim 2, wherein The mass percentage content of A and B in the herbicidal composition accounts for 10-80% of the total amount.

4. The herbicidal composition according to claim 1, wherein The herbicidal composition further comprises a conventional adjuvant.

5. The weeding composition according to claim 4, wherein The conventional adjuvant comprises a carrier and / or a surfactant.

6. The herbicidal composition according to claim 1, characterized in that, The herbicidal composition further comprises at least one safener.

7. The herbicidal composition according to claim 6, wherein, The safener is selected from one or more of isoxadifen-ethyl, cyprosulfamide, pyraclonil, cloquintocet-mexyl, gibberellic acid, furilazole, and metcamifen.

8. The herbicidal composition according to claim 1, wherein The specific formulation of the herbicidal composition is a dispersible oil suspension, a water suspension, a suspoemulsion, a wettable powder, an emulsifiable concentrate, a water-dispersible granule, an emulsion in water, or a microemulsion.

9. Use of the herbicidal composition according to any one of claims 1 to 8 for controlling weeds.

10. Use of the herbicidal composition according to any one of claims 1 to 8 for controlling weeds in a maize-soybean relay intercropping field.

11. A method for controlling the growth of unwanted plants, which comprises applying the herbicidal composition according to any one of claims 1 to 8 to plants, plant seeds, or the area where plants grow.

12. The method according to claim 11, wherein The unwanted plants are weeds in a maize-soybean relay intercropping field.

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