Herbicidal composition and use thereof

Abstract

The present invention relates to the field of pesticides, and relates to a herbicidal composition and a use thereof. The herbicidal composition comprises active ingredients including flufenacet and oxadiargyl, wherein the mass ratio of flufenacet to oxadiargyl is (0.13-12):1. The combination of oxadiargyl and flufenacet in the present invention can enhance control efficacy against resistant weeds, extend the weed-controlling spectrum, reduce the dosage of oxadiargyl, improve the safety, and can also solve the problem of poor drug efficacy of oxadiargyl at a low temperature, prolonging the lasting period. In addition, a combination of two herbicides having different action mechanisms can delay the development of weed resistance. The composition has advantages of high herbicidal efficacy, good safety, strong adaptability and environmental friendliness.

Description

A herbicidal composition and its application Technical Field

[0001] The present invention relates to the field of pesticides, and in particular to a herbicidal composition and application thereof. Background Art

[0002] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] Pesticides play a vital role in agricultural production. As the development of new pesticides becomes increasingly challenging, time-consuming, and financially demanding, the rational mixing of existing pesticide products to ensure effectiveness has become the only option. Proper mixing is a key means of maximizing the economic benefits of pesticides and ensuring a good harvest. Pesticide mixtures play a crucial role in pesticide processing and application. Consequently, there is growing attention being paid to the rational mixing of pesticides and the development of mixtures.

[0004] In developed countries, herbicide use accounts for the largest proportion of pesticides. With the modernization of agriculture, the expansion of scale, and the development of extensive tillage and cultivation management, the area of ​​herbicide use continues to expand, and the application technology and requirements are becoming increasingly sophisticated. A single herbicide is no longer sufficient to address the damage caused by mixed weeds. Herbicide mixtures are becoming increasingly common. Mixed herbicide use can leverage strengths and overcome weaknesses, reduce dosage, expand the spectrum of herbicides, improve efficacy, reduce residues in crops and soil, enhance adaptability to tillage and climatic conditions, and improve crop safety. Mixed herbicide use also plays a role in managing resistant weeds.

[0005] Flufenacet, internationally known as Flufenacet, CAS registration number: 142459-58-3, chemical name: 4'-fluoro-N-isopropyl-2-(5-trifluoromethyl-1,3,4-thiadiazol-2-yloxy)acetanilide, is an oxyacetamide herbicide developed by Bayer. Its mechanism of action is a cell division and growth inhibitor. It can be absorbed by the roots and new above-ground parts of the plant, and transmitted to the stems and leaves of the plant through the xylem, controlling annual grass weeds and certain broadleaf weeds by inhibiting cell division.

[0006] Oxadiargyl, also known internationally as oxadiargyl and CAS number 39807-15-3, is a new oxadiazolone herbicide developed by Rhone-Poulenc in France. Its mechanism of action is as a protoporphyrinogen oxidase inhibitor, making it a selective pre-emergence soil treatment herbicide. Upon application, its active ingredient forms a film on the soil surface, eliminating target weeds before they germinate. It is effective against weeds such as barnyardgrass, Leptochloa crus-galli, Spirogyra, Cyperus rotundus, Cyperus diversiformis, Cyperus rotundus, Cyperus rotundus, Dalbergia serrata, Dalbergia serrata, and Dalbergia serrata in rice fields.

[0007] In addition, propargyl is a protoporphyrinogen oxidase inhibitor, and when used in large quantities, it will pose a risk of phytotoxicity to crops.

[0008] In view of this, the present invention is proposed. Summary of the Invention

[0009] Purpose of the Invention

[0010] The present invention aims to provide a herbicidal composition and its use. The combination of oxadiazon and flufenacet not only improves the control efficacy against resistant weeds and expands the herbicidal spectrum, while also reducing the oxadiazon dosage and improving safety, but also addresses the problem of oxadiazon's poor efficacy at low temperatures and prolongs its duration. Furthermore, the combination of two herbicides with different mechanisms of action can slow the development of weed resistance. This composition combines the advantages of high weed control efficiency, good safety, strong adaptability, and environmental friendliness. The combination of oxadiazon and flufenacet is primarily applicable to non-transgenic conventional crops, with crops having completely different genetic backgrounds. This composition not only improves the control efficacy against resistant weeds and expands the herbicidal spectrum, while also significantly reducing the oxadiazon dosage in crops and improving safety, but also addresses the problem of oxadiazon's poor efficacy at low temperatures and prolongs its duration. Furthermore, the combination of two herbicides with different mechanisms of action can slow the development of weed resistance.

[0011] Solution

[0012] To achieve the purpose of the present invention, an embodiment of the present invention provides a herbicidal composition, the active ingredients of which include flufenacet and oxadiazon, and the weight ratio of flufenacet and oxadiazon is (0.13-12):1, optionally (0.25-12):1, optionally (0.13-6.0):1, optionally (0.25-6):1, optionally (0.25-4):1, optionally (0.25-3):1, optionally (0.25-2):1, optionally (0.5-4):1, optionally (1-4):1, optionally (1-2):1, optionally 0.25:1, 0.5:1, 1:1, 2:1, 3:1, 4:1, 6:1.

[0013] Furthermore, the active ingredient accounts for 3% to 80% of the total weight of the herbicidal composition, optionally 15 to 50%.

[0014] Furthermore, the herbicide composition is in the form of any one of an aqueous suspension concentrate, an oil suspension concentrate, a wettable powder, a water dispersible granule, or a suspoemulsion.

[0015] Furthermore, the herbicide composition further comprises an adjuvant acceptable to pesticides; optionally, the adjuvant acceptable to pesticides comprises one or more of a dispersant, a wetting agent, a thickener, an antifreeze agent, a defoaming agent, a preservative and a solvent;

[0016] Optionally, the dispersant is selected from one or more of alkylnaphthalene sulfonates, methacrylate copolymers, lignin sulfonates, and polycarboxylates;

[0017] Optionally, the wetting agent is selected from one or more of sodium alkyl sulfate, calcium alkylbenzene sulfonate, sodium alkylbenzene sulfonate, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, polyoxyethylene ether phosphate and salts thereof;

[0018] Optionally, the antifreeze agent is selected from one or more of ethylene glycol, propylene glycol, glycerol and urea;

[0019] Optionally, the thickener is selected from one or more of white carbon black, magnesium aluminum silicate, sodium carboxymethyl cellulose, xanthan gum, gelatin and gum arabic;

[0020] Optionally, the defoaming agent is selected from one or more of silicones, polyethers and fatty alcohols;

[0021] Optionally, the preservative is selected from isothiazolin-3-one preservatives, optionally selected from one or more of 1,2-phenylisothiazolin-3-one, 5-chloro-2methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one;

[0022] Optionally, the solvent is selected from any one or more of water, aromatic hydrocarbons, alcohols, ketones, amides and esters, and is optionally water.

[0023] Furthermore, the raw materials include the following weight fractions: flufenacet 1-20%, oxadiazon 1-20%, a wetting agent or a dispersant 3-10%, a thickener 1-10%, an antifreeze agent 1-10%, a preservative 0-5%, a defoaming agent 0-10%, and water 40-70%;

[0024] Optionally, the raw materials are included in the following weight fractions: 5-10% flufenacet, 5-10% oxadiazon, 5-10% wetting agent or dispersant, 1-10% thickener, 1-10% antifreeze, 0-5% preservative, 0-10% defoaming agent, and 40-70% water.

[0025] Optionally, the raw materials are included in the following weight fractions: 10% flufenacet, 5-10% oxadiazon, 5-10% wetting agent or dispersant, 1-10% thickener, 1-10% antifreeze agent, 0-5% preservative, 0-10% defoaming agent, and 40-70% water.

[0026] Furthermore, the composition is used to control weeds in cultivated land, non-cultivated land and / or orchards; optionally, the weeds include one or more of barnyard grass, Leptochloa chinensis, Setaria viridis, Amaranthus chinensis, Amaranthus retroflexus, Amaranthus aurantii, and Polygonum truncatum.

[0027] In a second aspect, a method for controlling weeds in cultivated land, non-cultivated land, and / or orchards using the herbicidal composition of the first aspect is provided. Optionally, the herbicidal composition is applied to a rice field, a peanut field, a soybean field, or a cotton field, wherein the rice field is a transplanted rice field.

[0028] Furthermore, the weeds include one or more of Echinochloa crus-galli, Leptochloa chinensis, Setaria viridis, Amaranthus chinensis, Amaranthus retroflexus, Amaranthus auriculariae, and Polygonum syringae.

[0029] Optionally, the herbicidal composition is applicable to non-transgenic crops or crops without protoporphyrinogen oxidase inhibitor resistance.

[0030] In a third aspect, the present invention provides a method for applying the above-mentioned herbicide composition or the above-mentioned herbicide composition formulation, including spraying, bottle throwing, granule broadcasting or poisoned soil method; preferably, the poisoned soil method includes mixing with soil or fertilizer.

[0031] Furthermore, the application amount of the active ingredient of the herbicide composition is 75 to 375 g ai / ha, wherein the application dosage of flufenacet in the herbicide composition is 30 to 150 g ai / ha, preferably 50 to 100 g ai / ha, and the application dosage of oxadiazon is 20 to 150 g ai / ha, preferably 50 to 100 g ai / ha.

[0032] The equipment for the processing of the preparation of the present invention is publicly known. Beneficial effects

[0033] The greatest advantage of the oxadiazon-methyl and flufenacet herbicide products provided by the present invention is their good safety for rice, peanuts, soybeans, and cotton. They have high control efficacy against difficult-to-control and resistant grass weeds in paddy fields, such as barnyard grass, Leptochloa chinensis, broad-leaved weeds Amaranthus aurantii, and Polygonum syringae. The effect is long-lasting, the composition significantly enhances synergy, and can expand the weed control spectrum. They also have high control efficacy against barnyard grass, Setaria viridis, Amaranthus retroflexus, and Amaranthus chinensis in dry fields. The herbicide products of the present invention can be sprayed, mixed with soil, or mixed with fertilizer for broadcast application, or applied by aircraft or mechanical spraying. When using the herbicide products, in addition to using the active ingredients directly, the active ingredients can also be formulated for use. Other herbicides and fertilizers can also be added for mixed use. Application can be simultaneous or sequential, making it flexible and convenient.

[0034] The combination of oxadiazon and flufenacet in the present invention is primarily used in non-genetically modified, conventional crops with completely different genetic backgrounds. This combination not only improves control effectiveness against resistant weeds and expands the weed control spectrum, but also significantly reduces the dosage of oxadiazon used in crops, improving safety. It also addresses the issue of oxadiazon's poor efficacy at low temperatures and prolongs its duration of action. Furthermore, the combination of two herbicides with different mechanisms of action can slow the development of weed resistance. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Unless otherwise expressly stated, throughout the specification and claims, the term "including" or its variations such as "comprising" or "including" will be understood to include the stated elements or components, without excluding other elements or other components.

[0036] In addition, in order to better illustrate the present invention, numerous specific details are provided in the specific embodiments below. It should be understood by those skilled in the art that the present invention can be implemented without certain specific details. In some embodiments, raw materials, components, methods, means, etc. well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present invention. In all formulations of the present invention, the percentages are all by weight.

[0037] The invention provides a herbicide composition. The active ingredients include flufenacet and oxadiazon. The weight ratio of flufenacet to oxadiazon is (0.13-12):1, optionally (0.25-12):1, optionally (0.25-6):1, optionally (0.25-4):1, optionally (0.25-3):1, optionally (0.25-2):1, optionally (0.5-4):1, optionally (1-4):1, optionally (1-2):1, optionally 0.25:1, 0.5:1, 1:1, 2:1, 3:1, 4:1, or 6:1.

[0038] The herbicidal composition of the present invention is applied to transplanted rice fields, has a synergistic effect on the malignant weed barnyard grass, has a broad weed control spectrum, has high control effect and long lasting effect on difficult-to-control gramineous weeds in rice fields such as barnyard grass and Leptochloa chinensis, and broad-leaved weeds such as cotton wool, duckweed, knotweed, water amaranth, and polygonum multiflorum, and is safe for rice.

[0039] The invention's herbicide product is applied to transplanted rice fields before or after transplanting by spraying, bottle application, broadcasting of granules, or poisoned soil application (mixing with soil or fertilizer). The herbicide product comprises the active ingredients flufenacet and oxadiazon, a solvent, and / or a solid carrier. The active ingredients can be used directly, formulated, or mixed with other herbicides, fertilizers, or the like. Application can be simultaneous or sequential.

[0040] Evaluation of the combined effects of flufenacet and oxadiazon

[0041] 1. Bioassay test method:

[0042] Refer to the Ministry of Agriculture's "Guidelines for Indoor Bioassay Tests of Pesticides. NY / T 1155.3-2006" Herbicides Part 4: Activity Determination Test, Soil Spray Method.

[0043] Flufenacet and oxadiazon-propyl of the present invention can be obtained commercially. For example, 98% flufenacet technical was purchased from Luzhou Dongfang Agrochemical Co., Ltd.; 96% oxadiazon technical was purchased from Hefei Xingyu Chemical Co., Ltd.; and 5% oxadiazon-propyl + 30% butachlor EC was purchased from Anhui Lantian Agricultural Development Co., Ltd.

[0044] Preparation of liquid medicine:

[0045] Technical drug: Accurately weigh a certain mass of herbicide technical drug, dissolve it with DMF (dimethylformamide), add clean water containing 0.1% Tween 80 emulsifier, stir evenly, and prepare a solution of a certain concentration for use.

[0046] Preparation: The preparation is weighed directly and diluted with water for processing.

[0047] 2. Evaluation criteria for herbicidal activity by visual inspection

[0048] Visual evaluation of herbicidal activity The herbicidal activity of the agent was evaluated visually based on the degree of plant damage symptoms (inhibition, deformity, yellowing, and albinism). 0 indicates no herbicidal effect, and 100% indicates complete kill of the weeds. The visual evaluation criteria are shown in Table 1-1.

[0049] Table 1-1 Evaluation criteria for herbicidal activity by visual inspection

[0050] The calculation formula for fresh weight or plant number inhibition rate is as follows:

[0051] 3. Crop safety evaluation standards

[0052] According to the Ministry of Agriculture's industry standard "NY / T1155.8-2007 Pesticide Indoor Bioassay Test Guidelines for Herbicides Part 8: Crop Safety Test - Leaf Spray Method", the crop safety evaluation standards are shown in the table below.

[0053] Table 1-2 Crop injury evaluation standards

[0054] The field test data were analyzed for variance using DPS 7.05 statistical analysis software and Duncan's new multiple range method to determine the significance of the differences between the treatments (α = 0.05).

[0055] 3. Combined effect evaluation test

[0056] The compositions provided herein were tested indoors to demonstrate the combined action of flufenacet and oxadiazon. Greenhouse potted plant activity assays compared the herbicidal activity of flufenacet and oxadiazon in different ratios and with the individual combinations.

[0057] The experimental targets were Echinochloa crus-galli (grass weed) and Ammannia arenaria (broad-leaved weed). The weed seeds were collected from rice fields and stored in a seed bank indoors.

[0058] A greenhouse potting method was used. Approximately 10 target weed seeds were sown on the soil surface in plastic pots filled with a fixed amount of soil. Covered with 0.5–1 cm of fine soil, the plants were then cultured in the greenhouse. After sowing, the soil was sprayed before seedlings emerged. Each treatment was replicated four times, with a non-medicated treatment serving as a control. After treatment, the plants were cultured in the greenhouse, and the growth of the target weeds was regularly observed. Comprehensive herbicidal activity was visually assessed 30 days after treatment. The control efficacy against barnyardgrass and water amaranth, respectively, is shown in Tables 2 and 3.

[0059] The combined action type of flufenacet and oxadiazon combinations was evaluated using the Gowing method. The specific steps involved first measuring the control efficacy of the individual agents and the mixture against target weeds, then calculating the theoretical control efficacy of the mixture based on the measured control efficacy of the individual agents. This theoretical control efficacy was then compared with the measured control efficacy of the mixture to evaluate the combined action type.

[0060] The formula for calculating the mixing effect of the Gowing method is: E0 = X + Y – XY / 100;

[0061] Where X represents the weed control efficacy of herbicide A at a dosage of P; Y represents the weed control efficacy of herbicide B at a dosage of Q; and E0 represents the theoretical weed control efficacy of herbicide (A + B) at a dosage of (P + Q). A is flufenacet and B is oxadiazon.

[0062] Table 2 Evaluation results of the combined effects of flufenacet + oxadiazon in different ratios on barnyard grass

[0063] Table 3 Evaluation results of the combined effects of flufenacet and oxadiazon in different ratios on Amaranthus chinensis

[0064] The results in Tables 2 and 3 show that the weed control efficacy of the two mixed agents was higher than that of the two single agents, indicating improved herbicidal activity. Evaluation of the combined effects of the combinations showed that the actual control efficacy (E) of flufenacet and oxadiazon-methyl in most ratios was greater than the theoretical control efficacy (E0). Within the 0.13-6.0:1 ratio range, flufenacet and oxadiazon-methyl exhibited a synergistic effect against barnyardgrass, and within the 0.25-12:1 ratio range, flufenacet and oxadiazon-methyl exhibited a synergistic effect against water spinach. Within the 0.25-6.0:1 ratio range, the E-E0 values ​​for both weeds were greater than 10%. The combined effects of the mixtures were synergistic, while the remaining ratios exhibited synergistic or additive effects, with no antagonistic effects observed.

[0065] The present invention also carries out preparation example:

[0066] Example 1 Flufenacet:oxadiazine mass ratio is 1:1

[0067] Table 4 Composition of components of Example 1

[0068] Example 2 Flufenacet:oxadiazine mass ratio is 2:1

[0069] Table 5 Composition of components of Example 2

[0070] Example 3 Flufenacet:oxadiazine mass ratio is 4:1

[0071] Table 6 Composition of components of Example 3

[0072] Comparative Example 1

[0073] The difference from Example 1 is that oxadiazon was replaced with an equal amount of water to prepare a single dose of flufenacet.

[0074] Comparative Example 2

[0075] The difference from Example 1 is that flufenacet was replaced with an equal amount of water to prepare a single dose of oxadiazon.

[0076] The compositions of Examples 1 to 3 and Comparative Examples 1 to 2 are in the form of aqueous suspensions, which are prepared according to conventional aqueous suspension preparation methods.

[0077] Test Example 1 Comparative test of greenhouse herbicidal activity and safety

[0078] Indoor activity tests were conducted on the herbicide combination to determine its weed control efficacy and crop safety. The test targets were barnyard grass (Echinochloa crus-galli), lilac polygonum (Ludwigia prostrata), and rice (Oryza sativa L.). Weed seeds were collected from paddy fields, while rice seeds were commercially available and stored indoors in a seed bank.

[0079] Test Method: Using a greenhouse potting method, a plastic pot was filled with a fixed amount of soil. Approximately 10 target weed seeds were sown on the soil surface, covered with 0.5-1 cm of fine soil, and then cultured in a greenhouse. The soil was sprayed with a spray spray after sowing and before emergence. Each treatment was repeated four times. After treatment, the target weeds were cultured in the greenhouse, and the growth of the target weeds was regularly observed. The comprehensive herbicidal activity was visually inspected regularly after treatment.

[0080] Rice safety test: Rice (Tsuen U 822) was transplanted at the 2-leaf, 1-heart stage and sprayed on stems and leaves 24 hours later. After treatment, the rice was cultured in a greenhouse, simulating field-based water conservation. The rice's growth was regularly observed, and overall growth inhibition was visually inspected approximately 30 days after application.

[0081] This test utilized the herbicide combination formulations provided in Examples 1-2 and Comparative Examples 1-4. The test results, measured 30 days after application, are shown in Table 7. The results demonstrated that the herbicide combination formulations provided in Examples 1-2 exhibited an activity of 93.6% to 97.2% against the grass weed Echinochloa crusgalli and the broadleaf weed Polygonum truncatum, respectively, with safety impacts on rice of 0.7% and 5.3%, respectively. Both weed control efficacy and safety were superior to those of the comparative examples. This herbicide combination reduces the dosage of the active ingredient while improving rice safety and maintaining excellent herbicidal activity against both grass weeds and broadleaf weeds.

[0082] Table 7 Comparative test results of herbicidal activity and rice safety of different compositions 30 days after application

[0083] Note: Different letters in the same column indicate significant differences (P<0.05).

[0084] Test Example 2: Comparative test at different temperatures

[0085] The test method refers to Test Example 1. Example 1 and Comparative Examples 3-4 were selected for comparative testing. After treatment with the agent, the plants were placed in plant growth light incubators at different temperatures for cultivation and growth. The incubator temperatures were 15°C and 30°C, respectively. The specific results are shown in Table 8. The results 30 days after treatment showed that the herbicide composition formulation provided in Example 1 maintained high herbicidal activity at both 15°C and 30°C, and was also safe for rice, with the application effect significantly superior to the two comparative examples.

[0086] Table 8 Comparative test results of the effects of different temperatures on the herbicidal activity and safety of the composition

[0087] Note: Different letters in the same column indicate significant differences (P<0.05).

[0088] Test Example 3: Comparative test of duration of efficacy

[0089] The test method was similar to that of Test Example 1. Example 1 and Comparative Examples 3-4 were used for comparative testing. The herbicidal activity against barnyardgrass was investigated at different times after treatment. The specific results are shown in Table 9. The results showed that the herbicide composition provided in Example 1 maintained high herbicidal activity 20 and 40 days after treatment, while the two comparative examples showed high activity 20 days after treatment and a significant decrease in activity 40 days after treatment.

[0090] Table 9 Comparative test results of the effective period of the composition against barnyard grass

[0091] Note: Different letters in the same column indicate significant differences (P<0.05).

[0092] Test Example 4 Field Trial

[0093] 1. Rice fields

[0094] The test was conducted using a field plot method in accordance with the national standard "GB / T 17980.40-2000 Guidelines for Field Efficacy Tests of Pesticides (I) Herbicides for Control of Weeds in Paddy Fields." The test was conducted in Lianjiangkou Town, Jiamusi City, Heilongjiang Province. The experimental field was flat, with complete irrigation and drainage facilities, consistent field management, uniform medium fertility, loam soil, and a neutral pH. Land preparation was conducted on May 1st, and rice seedlings were transplanted on May 10th. Land was prepared using a harrow and rotary tiller. The previous crop in the experimental field was rice, and the rice variety was Longjing 31. The main weeds in the experimental field were barnyard grass and Alisma orientalis, which occurred evenly.

[0095] The experimental plots were arranged in random blocks. Each plot was separated by black plastic baffles and had independent water inlets and outlets to prevent water contamination between different treatments. Before drug application, each plot was irrigated and a 5-10 cm water layer was maintained. The plot area was 25.5 m 2 The plot was rectangular in shape and repeated 3 times for each treatment. The pesticide treatment was carried out before transplanting rice seedlings. The pesticide application method was spraying, using an electric sprayer to evenly spray the rice, with a water content of 30L / mu.

[0096] Weed control efficacy and rice growth effects were visually assessed at various times after treatment, as shown in Tables 10 and 11. Yield measurements were taken for each plot at rice harvest time. The results demonstrated that the flufenacet + oxadiazon / methylenediamine combination (75 g / ha + 75 g / ha) demonstrated safety for transplanted rice and significantly increased yield. It also demonstrated high control efficacy against barnyardgrass and oriental water chestnuts, surpassing the conventional herbicide combination of oxadiazon / methylenediamine + butachlor.

[0097] Table 10 Composition Example Transplanted Rice Field Weed Control Field Plot Test Results - Safety

[0098] Note: Different letters in the same column indicate significant differences (P<0.05).

[0099] Table 11 Composition Example Field Plot Test Results for Weed Control in Transplanted Rice Fields - Weed Control Efficacy

[0100] Note: Different letters in the same column indicate significant differences (P<0.05).

[0101] 2. Peanut fields

[0102] The trial was conducted using a field plot method in accordance with the national standard "GB / T 17980.126-2004 Guidelines for Field Efficacy Tests of Pesticides (II) Part 126: Herbicides for Control of Weeds in Peanut Fields." The trial was conducted in Fengzhuang Village, Fenchen Town, Xiangcheng County, Xuchang City, Henan Province. The experimental field was flat, with consistent field management, uniform fertility, sandy loam soil, and a neutral pH. Planting was on May 10th at a sowing rate of 30 jin / mu. The peanut variety was Huayu 25. The previous crop was peanuts. The main weeds in the experimental field were barnyard grass, Amaranthus retroflexus, and Amaranthus chinensis, which were evenly distributed.

[0103] The experimental plots were arranged in random blocks, with a plot area of ​​25m 2 , the plot shape is rectangular, and each treatment is repeated 3 times. Pre-emergence soil spray treatment is carried out after peanut sowing, and an electric sprayer is used for uniform spraying treatment, with a water content of 50L / mu. 25 days after the treatment, the weed control effect and crop safety results are investigated by visual inspection, and the results are shown in Table 12. The test results show that the combination of flufenacet + propargyl oxadiazon applied to peanut fields has a high weed control effect. 25 days after the application, the visual control effect of barnyard grass, Amaranthus retroflexus, and Amaranthus chinensis is greater than 90%. Example 3 The agent is safe for peanuts.

[0104] Table 12 Composition Example Peanut Field Weed Control Field Plot Test Results

[0105] Note: The same letters indicate no significant difference.

[0106] 3. Soybean fields

[0107] The test was conducted using a field plot method in accordance with the national standard "GB / T 17980.125-2004 Guidelines for Field Efficacy Tests of Pesticides (II) Part 125: Herbicides for Control of Weeds in Soybean Fields." The test was conducted in Fengzhuang Village, Fenchen Town, Xiangcheng County, Xuchang City, Henan Province. The experimental field was flat, with consistent field management, uniform fertility, sandy loam soil, and a neutral pH. Soybean varieties were Yudou 16 and planted on June 12th. The previous crop was wheat. The main weeds in the experimental field were barnyard grass, foxtail grass, Amaranthus retroflexus, and Amaranthus chinensis, all of which were evenly distributed.

[0108] The experimental plots were arranged in random blocks, with a plot area of ​​25m 2 The plots were rectangular in shape, and each treatment was repeated three times. Pre-emergence soil spraying was performed after soybean sowing, using an electric sprayer for uniform spraying with a watering rate of 50 L / mu. Visual inspection was used to investigate weed control efficacy and crop safety 25 days after treatment, with the results shown in Table 13. The test results showed that the combination of flufenacet and oxadiazon was highly effective in controlling weeds in soybean fields. Visual inspection showed greater than 90% control efficacy against barnyard grass, foxtail grass, amaranthus retroflexus, and amaranthus chinensis 25 days after treatment, indicating that the agent in Example 3 was safe for soybeans.

[0109] Table 13 Composition Example Soybean Field Weed Control Field Plot Test Results

[0110] 4. Cotton Field

[0111] The test was conducted using a field plot method in accordance with the national standard "GB / T 17980.128-2004 Guidelines for Field Efficacy Tests of Pesticides (II) Part 128: Herbicides for Control of Weeds in Cotton Fields." The trial was conducted in Xingjiazhuangzi Village, Jiujianlou Township, Wusu City, Tacheng Prefecture, Xinjiang. Film-mulched drip irrigation was used. The experimental plots were flat, with consistent field management practices and uniform, medium-fertility sandy loam soil with a pH of 9.27. Cotton was sown on April 15th, with the cotton variety Xinlu Zao 72. The main weeds in the experimental fields were barnyard grass, foxtail grass, and Amaranthus retroflexus, which were evenly distributed.

[0112] The experimental plots were arranged in random blocks, with a plot area of ​​30m 2 The plots were rectangular in shape, and each treatment was replicated three times. Soil spraying was performed before cotton sowing, using an electric sprayer for uniform spraying at a watering rate of 80 L / mu. Visual inspection of weed control efficacy and crop safety was conducted 25 days after treatment, with the results shown in Table 14. The test results showed that the combination of flufenacet and oxadiazon was highly effective in controlling weeds in cotton fields, with visual control efficacy exceeding 90% against barnyard grass, foxtail grass, and Amaranthus retroflexus 25 days after treatment. The agent in Example 2 was shown to be safe for cotton.

[0113] Table 14 Composition Example Cotton Field Weed Control Field Plot Test Results

[0114] The greatest advantage of the herbicide product provided by the present invention is its good safety for conventional crops (rice, peanuts, soybeans, and cotton). It has a high control effect on barnyard grass, a difficult-to-control and resistant grass weed in paddy fields, a long-lasting effect, and a significant synergistic effect of the composition, and can expand the weed control spectrum; it has a high control effect on barnyard grass, foxtail grass, Amaranthus retroflexus, and Amaranthus chinensis in dry fields. The herbicide product of the present invention can be sprayed, mixed with soil, or mixed with fertilizer for broadcasting, or applied by aircraft or mechanical spraying; when using the herbicide product, in addition to using the active ingredient directly, the active ingredient can also be formulated and used; other herbicides and fertilizers can also be added for mixed use. When applying, it can be applied simultaneously or sequentially, which is flexible and convenient to use.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A herbicidal composition, characterized in that The active ingredients include flufenacet and oxadiazon, and the weight ratio of flufenacet to oxadiazon is (0.13-12):

1.

2. The herbicidal composition according to claim 1, characterized in that The weight ratio of flufenacet and oxadiazon is (0.25-12):1, optionally (0.13-6.0):1, optionally (0.25-6):1, optionally (0.25-4):1, optionally (0.25-3):1, optionally (0.25-2):1, optionally (0.5-4):1, optionally (1-4):1, optionally (1-2):1, optionally 0.25:1, 0.5:1, 1:1, 2:1, 3:1, 4:1, 6:

1.

3. The herbicidal composition according to claim 1 or 2, characterized in that The active ingredient accounts for 3% to 80% of the total weight of the herbicidal composition, optionally 15 to 50%.

4. The herbicidal composition according to any one of claims 1 to 3, characterized in that The herbicide composition is in the form of any one of a water suspension concentrate, an oil suspension concentrate, a wettable powder, a water dispersible granule, and a suspoemulsion.

5. The herbicidal composition according to claim 4, characterized in that The herbicide composition further comprises an adjuvant acceptable to pesticides; optionally, the adjuvant acceptable to pesticides comprises one or more of a dispersant, a wetting agent, a thickener, an antifreeze agent, a defoaming agent, a preservative and a solvent; Optionally, the dispersant is selected from one or more of alkylnaphthalene sulfonates, methacrylate copolymers, lignin sulfonates, and polycarboxylates; Optionally, the wetting agent is selected from one or more of sodium alkyl sulfate, calcium alkylbenzene sulfonate, sodium alkylbenzene sulfonate, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, polyoxyethylene ether phosphate and salts thereof; Optionally, the antifreeze agent is selected from one or more of ethylene glycol, propylene glycol, glycerol and urea; Optionally, the thickener is selected from one or more of white carbon black, magnesium aluminum silicate, sodium carboxymethyl cellulose, xanthan gum, gelatin and gum arabic; Optionally, the defoaming agent is selected from one or more of silicones, polyethers and fatty alcohols; Optionally, the preservative is selected from isothiazolin-3-one preservatives, optionally selected from one or more of 1,2-phenylisothiazolin-3-one, 5-chloro-2methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one; Optionally, the solvent is selected from any one or more of water, aromatic hydrocarbons, alcohols, ketones, amides and esters, and is optionally water.

6. The herbicidal composition according to any one of claims 1 to 5, characterized in that The invention comprises the following raw materials in weight fractions: 1-20% of flufenacet, 1-20% of oxadiazon, 3-10% of a wetting agent or a dispersant, 1-10% of a thickener, 1-10% of an antifreeze agent, 0-5% of a preservative, 0-10% of a defoaming agent, and 40-70% of water; Optionally, the raw materials include the following weight fractions: 10-20% flufenacet, 5-10% oxadiazon, 5-10% wetting agent or dispersant, 1-10% thickener, 1-10% antifreeze agent, 0-5% preservative, 0-10% defoaming agent, and 40-70% water; Optionally, the raw materials are included in the following weight fractions: 10% flufenacet, 5-10% oxadiazon, 5-10% wetting agent or dispersant, 1-10% thickener, 1-10% antifreeze agent, 0-5% preservative, 0-10% defoaming agent, and 40-70% water.

7. The herbicidal composition according to any one of claims 1 to 6, characterized in that The composition is used for preventing and controlling weeds in cultivated land, non-cultivated land and / or orchards; optionally, the weeds include one or more of barnyard grass, Leptochloa chinensis, Setaria viridis, Amaranthus chinensis, Amaranthus retroflexus, Amaranthus aurantii, and Polygonum truncatum.

8. Use of the herbicidal composition according to any one of claims 1 to 7 for controlling weeds in cultivated land, non-cultivated land and / or orchards.

9. The use according to claim 8, characterized in that The weeds include one or more of Echinochloa crus-galli, Leptochloa chinensis, Setaria viridis, Amaranthus chinensis, Amaranthus retroflexus, Amaranthus auriculariae, and Polygonum syringae; Optionally, the herbicidal composition is applied to rice fields, peanut fields, soybean fields or cotton fields. Optionally, the herbicidal composition is applicable to non-transgenic crops or crops without resistance to protoporphyrinogen oxidase inhibitors.

10. A method for applying the herbicide composition formulation according to claims 1 to 7, characterized in that: Including spraying method, bottle throwing method, granule spreading method or poison soil method; preferably, the poison soil method includes mixing with soil or fertilizer; Optionally, the application amount of the active ingredient of the herbicide composition is 75 to 375 g ai / ha, the application dosage of flufenacet in the herbicide composition is 30 to 150 g ai / ha, preferably 50 to 100 g ai / ha, and the application dosage of oxadiazon is 20 to 150 g ai / ha, preferably 50 to 100 g ai / ha.

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