Herbicidal composition containing bentazone and its application

Abstract

The present invention belongs to the field of pesticides, and particularly relates to a herbicidal composition containing bentazone 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 #imgabs0# and the active ingredient B is bentazone. 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 herbicidal composition containing bentazone 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 easily causes problems such as weed drug resistance and resistance evolution.

[0003] Bentazone is a heterocyclic contact and slightly systemic herbicide. It is mainly absorbed through leaves (in paddy fields, roots can also absorb), penetrates through the leaf surface and is conducted to the chloroplasts, inhibiting the electron transfer of photosynthesis.

[0004] 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. It is one of the most effective methods to solve the above problems. There is still a need in production to develop herbicidal composition varieties with high safety, broad herbicide spectrum, capable of producing synergistic effects and solving resistant weeds. Summary of the Invention

[0005] To solve the above problems existing in the prior art, the present invention provides a herbicidal composition containing bentazone 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 herbicide spectrum, reducing the application rate, being able to produce synergistic effects and solving resistant weeds.

[0006] A herbicidal composition containing bentazone, comprising an effective herbicidal amount of active ingredient A and active ingredient B, wherein active ingredient A is Active ingredient B is bentazone (CAS: 25057-89-0).

[0007] Wherein, the weight ratio of A to B in the herbicidal composition is 1:10 to 1:1, preferably 1:5 to 1:1, more preferably 1:4 to 1:2.

[0008] The mass percentage content of A and B in the herbicidal composition accounts for 1-95% of the total amount, preferably 10-80%.

[0009] The herbicidal composition further contains conventional auxiliaries, and the conventional auxiliaries include carriers and / or surfactants.

[0010] 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 this carrier is generally inert and must be agriculturally acceptable, especially acceptable to the plants being treated. The carrier can be solid, such as clay, natural or synthetic silicates, silica, resins, waxes, solid fertilizers, etc.; or liquid, such as water, alcohols, ketones, petroleum fractions, aromatic or paraffinic hydrocarbons, chlorinated hydrocarbons, liquefied gases, etc.

[0011] 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 phenol sulfonic acid or naphthalene sulfonic 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 phosphates of polyhydroxyethylated phenols, alkyl sulfonates, alkyl aryl sulfonates, alkyl sulfates, lauryl ether sulfates, fatty alcohol sulfates, and sulfated cetyl-, heptadecyl- and octadecyl alcohols as well as sulfated fatty alcohol ethylene glycol ethers. In addition, there are condensation products of naphthalene or naphthalene sulfonic acid with phenol and formaldehyde, polyoxyethylene octyl phenyl ether, ethoxylated isooctyl phenol, octyl phenol or nonyl phenol, alkyl phenyl polyethylene glycol ethers, tributyl phenyl polyethylene glycol ethers, tristearyl phenyl polyethylene glycol ethers, alkyl aryl polyether alcohols, alcohols and fatty alcohol / ethylene oxide condensates, ethoxylated castor oil, polyoxyethylene alkyl ethers, ethoxylated polyoxypropylene, lauryl alcohol polyethylene glycol ether acetal, sorbitol esters, lignosulfite waste liquors, and proteins, denatured proteins, polysaccharides (such as methyl cellulose), hydrophobically modified starches, polyvinyl alcohol, polycarboxylates, polyalkoxylates, polyvinylamines, polyvinylpyrrolidone and their copolymers. At least one surfactant is required to be present to facilitate the dispersion of the active ingredient in water and to enable them to be correctly applied to plants.

[0012] The above compositions can also contain various other components, such as protective colloids, adhesives, thickeners, thixotropic agents, penetrants, stabilizers, chelating agents, dyes, colorants and polymers.

[0013] The herbicidal composition further includes 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: 77-06-5), furilazole (CAS: 121776-33-8), metcamifen (CAS: 129531-12-0).

[0014] 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 more of surfactants such as dispersants, stabilizers, wetting agents, binders, defoaming agents, etc. are added.

[0015] 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, and microemulsions.

[0016] 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 is also different. The external conditions are, for example, temperature, humidity, the nature of the herbicide used, and so on. It can have a large variation range, 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.

[0017] In the context of this specification, if an abbreviated form of the common name of the 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 with 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.

[0018] 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.

[0019] In addition, the composition of the present invention can be applied to the leaves of the plants to be treated by spraying, that is, applied to weeds, especially the surfaces affected by weed infestation or prone to weed infestation.

[0020] When the herbicidal composition of the present invention is applied, an unexpected synergistic effect is 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 effect is manifested as a reduced application rate, a wider weed control spectrum, a faster and more persistent herbicidal effect, 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.

[0021] The synergistic herbicidal composition of the present invention also has the following advantages:

[0022] (1) The composition of the present invention is environmentally friendly and is easily degradable in the environment.

[0023] (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.

[0024] 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 Description of the Invention

[0025] 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:

[0026] A) Examples

[0027] 1. Wettable powder of A + bentazone (20 + 40)

[0028] 20% A + 40% bentazone + 6% precipitated silica + 4% Nekal BX + 4% polycarboxylate dispersant + 2% sodium lignosulfonate + diatomaceous earth to make up

[0029] The above wettable powder processing equipment: mechanical grinder, air jet mill.

[0030] The above wettable powder processing process: Put all materials such as technical drugs and auxiliaries into a mechanical grinder, then pass through an air jet mill, and reserve after passing the sampling and testing.

[0031] B) Efficacy test

[0032] Post-emergence foliar spray treatment:

[0033] 1) Test conditions

[0034] 1.1), Test targets

[0035] Weeds were cultured using the pot method. 180х140mm plastic nutrient bowls were placed in enamel trays and filled with surface soil (at the 4 / 5 level) collected from farmland, air-dried and sieved. The soil humidity was initially controlled at 20%. Weed seeds with plump and uniform grains were selected, soaked in warm water at 25°C for 6 hours, germinated in a biochemical incubator at 28°C (in the dark), and the weed seeds that had just showed white tips were evenly placed on the soil surface. Then, according to the seed particle size, the soil was covered with a layer of 0.5 - 1 cm.

[0036] 1.2), Cultivation conditions

[0037] It was carried out in a controllable solar greenhouse with a temperature of 20 - 30°C, natural light, and a relative humidity of 57% - 72%. The soil type was loam, with an organic matter content of 1.63%, pH = 7.1, alkaline hydrolyzable nitrogen of 84.3 mg / kg, available phosphorus of 38.5 mg / kg, and available potassium of 82.1 mg / kg.

[0038] 1.3), Instruments and equipment

[0039] 3WP - 2000 type walking spray tower, Nanjing Institute of Agricultural Machinery, Ministry of Agriculture. GA0 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).

[0040] 2) Experimental design

[0041] 2.1), Reagents

[0042] The required active ingredient A was synthesized with reference to Patent US1105357 ( 1 H NMR (500 MHz, DMSO - d6) δ 7.81 (d, J = 2.0 Hz, 1H), 7.48–7.55 (m, 1H), 7.41 (d, J = 8.5 Hz, 1H), 4.72 (s, 2H), 4.07 (s, 2H), 1.16 (s, 6H).); The required active ingredient B was purchased from a reagent company. The technical drugs were all dissolved in acetone and diluted with an aqueous solution of 0.1% emulsifier Tween - 80, and diluted immediately before use.

[0043] 2.2), Experimental treatments

[0044] 2.2.1), Dose setting

[0045] When determining the ratio or content of A and active ingredient B, it should be measured from the action characteristics and toxicity of the two agents, and the main purpose of using the formulation should also be considered. Based on the preliminary pre - tests in this study, the single - use and mixed dosages of active ingredients A and B are shown in the table respectively. Water containing no drug, the same solvent and emulsifier was used as the blank control.

[0046] 2.2.2) Replicates of the experiment

[0047] Each treatment was replicated 4 times. Each treatment had 3 pots, and 10 weed seeds were sown in each pot. There were 30 plants in each treatment in total.

[0048] 2.3) Treatment methods

[0049] 2.3.1) Treatment time and frequency

[0050] The experiment was conducted with pesticide application once. When the weeds reached the 1.5 - 2 leaf stage, thin out the seedlings to keep 5 weeds in each pot, and keep 5 plants for each treatment. Then continue to cultivate until the 2 - 3 leaf stage for treatment.

[0051] 2.3.2) Instruments used and pesticide application method

[0052] Place the well - cultivated test materials evenly on a platform with an area of 0.5 m 2 and spray the stems and leaves with a 3WP - 2000 walking - type spray tower. The spraying volume is calculated at 450 kg / ha, and the spraying pressure is 0.3 MPa. After all the liquid medicine is sprayed, close the air valve. After 30 seconds, open the spray tower door and take out the nutrient pots. Then open the air valve and spray 50 mL of clear water to clean the spray liquid pipe.

[0053] 3) Experimental methods

[0054] The pot - culture method was adopted. For the cultivation of weeds, refer to 1.1), and follow the "Guidelines for Pesticide Bioassay in the Laboratory - Herbicides". For the pesticide application method, refer to 2.3.2), and the stem - leaf treatment method was used. After treatment, transfer them to the greenhouse for conventional cultivation.

[0055] 4) Data investigation and statistical analysis

[0056] 4.1) Investigation method

[0057] The absolute - number investigation method was 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 dead weeds, count the fresh weight as zero.

[0058] 4.2) Investigation time and frequency

[0059] The investigation was carried out 21 days after treatment, with a total of 1 investigation.

[0060] 4.3) Data statistical analysis

[0061] The theoretical fresh weight inhibition rate of each treatment mixture combination was calculated by the Gowing method (E0 = X + Y - X * Y / 100), and then compared with the measured inhibition rate (E) to evaluate the type of combined effect of the two on weeds. 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 the optimal ratio was determined 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 active ingredient A is P; Y is the fresh weight inhibition rate when the dosage of active ingredient B is Q.

[0062] Table 1 Evaluation of the actual control effect and combined effect of A mixed with B on Xanthium sibiricum

[0063]

[0064] C) Field demonstration

[0065] The herbicidal composition prepared in Example 1 above was used for a weeding effect test in a maize-soybean strip intercropping field. The weeds occurring in the field mainly included: Digitaria sanguinalis, Echinochloa crusgalli, Eleusine indica, Xanthium sibiricum, Abutilon theophrasti, Chenopodium album, etc.

[0066] Test method:

[0067] Foliar treatment (F): When the weeds were at the 2 - 3 leaf stage, a manual sprayer was used, with a water dilution of 30 kg / 667m 2 , and foliar spraying was carried out evenly by spraying.

[0068] The specific test agents and dosages are shown in Table 2. 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 2.

[0069]

[0070] Field demonstration effect of the compound composition described in Table 2

[0071]

[0072] Through a large number of tests and explorations, the present invention unexpectedly found that the said composition is used for controlling mainly Gramineae weeds, broadleaf weeds and Cyperaceae weeds, etc., and has a surprising and unexpected synergistic effect. This synergistic effect is more significant at low dosages, can reduce the amount of drug used, reduce environmental pollution, and the reasonable compounding reduces the agricultural cost and has good application prospects. At the same time, through testing, it shows good selectivity and excellent synergistic effect on plants such as wheat fields, maize fields, rice fields, peanuts, sugarcane, sorghum, millet, potatoes, rapeseed, soybeans, cotton, vegetables, Poa annua, Festuca arundinacea, Zoysia japonica, etc., and can be developed into a herbicide mixture with broad market value.

Claims

1. A herbicidal composition comprising bentazone, 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 bentazone, and the weight ratio of A to B in the herbicidal composition is 1:4 to 1:

2.

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 weeding composition according to claim 1, characterized in that, The herbicidal composition further comprises a conventional adjuvant.

5. The herbicidal composition according to claim 4, characterized in that, The conventional adjuvant comprises a carrier and / or a surfactant.

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

7. The weeding composition according to claim 6, characterized in that, The safener is selected from one or more of isoxadifen - ethyl, cyprosulfamide, pyraclonil, cloquintocet - mexyl, gibberellic acid, furilazole, 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 suspo - emulsion, 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 - 8 in controlling weeds.

10. The application according to claim 9, wherein Use of the described herbicidal composition in 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 - 8 to plants, plant parts, plant seeds or the areas 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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