Herbicides and their use

Abstract

The present application provides a kind of herbicide and its application, it is related to the technical field of pesticide, the active ingredient of the herbicide includes Epyrifenacil and terbumeton;Wherein, the weight ratio of Epyrifenacil and terbumeton is 1:0.01-1000.The present application solves the problem that the current farmland resistance weed rising trend intensifies, reaches the technical effect that herbicide not only broad spectrum, the effect of weed control is remarkable, delays weed resistance, and the use dose of herbicide is low, the cost of drug is low and the environment is safe.

Description

Technical Field

[0001] This invention relates to the field of pesticide technology, and in particular to a herbicide and its application. Background Technology

[0002] Farmland weeds are a major factor causing a decline in crop yield and quality. Farmland weeds compete with crops for soil nutrients, space and sunlight, thus directly harming crops. At the same time, they also indirectly harm crops by serving as hosts for pathogens and insects.

[0003] While the widespread use of highly effective chemical herbicides has brought numerous benefits to agricultural production, it has also led to the problem of herbicide resistance in weeds, which has become a global challenge. In recent years, the number of herbicide-resistant weeds has been increasing almost linearly. If left uncontrolled, these resistant weeds will not only exacerbate the damage caused by weeds in farmland but also increase the difficulty of controlling them.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] One of the objectives of this invention is to provide a herbicide that exhibits excellent synergistic effects, not only with a broad spectrum of weed control and significant efficacy in weed control, but also with the ability to effectively reduce pesticide dosage, thereby reducing pesticide costs and environmental impact.

[0006] The second objective of this invention is to provide an application of a herbicide that can simultaneously control multiple weeds, is convenient and efficient to use, and has outstanding application effects.

[0007] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted:

[0008] In a first aspect, a herbicide, the active ingredients of which include Epyrifenacil and terbutaline;

[0009] The weight ratio of Epyrifenacil to tertidine is 1:0.01 to 1000.

[0010] Furthermore, the weight ratio of Epyrifenacil to tertidine is 1:0.1 to 500;

[0011] Preferably, the weight ratio of Epyrifenacil to tertidine is 1:1 to 500;

[0012] Preferably, the weight ratio of Epyrifenacil to tertidine is 1:2 to 300.

[0013] Furthermore, the active ingredient accounts for 1-99% by weight in the herbicide;

[0014] Preferably, the active ingredient accounts for 5-70% by weight in the herbicide.

[0015] Furthermore, the active ingredient accounts for 10-50% of the weight of the herbicide.

[0016] Furthermore, the herbicide also includes at least one of agrochemically acceptable surfactants and carriers.

[0017] Furthermore, the formulation of the herbicide includes at least one of emulsifiable concentrate, water emulsion, water suspension, suspension emulsion, dispersible oil suspension, wettable powder, and water dispersible granules.

[0018] Secondly, the application of any of the above-mentioned herbicides in the control of grassy and broadleaf weeds.

[0019] Furthermore, the herbicide is used to control grassy and broadleaf weeds in cornfields.

[0020] Furthermore, the weeds include at least one of the following: foxtail grass, barnyard grass, crabgrass, goosegrass, creeping jenny, dayflower, purslane, thistle, lambsquarters, amaranth, and sow thistle.

[0021] Furthermore, the weeds are at least one of foxtail grass, crabgrass, purslane, and amaranth.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] The herbicide provided by this invention combines Epyrifenacil and terbutaline, which have different structural types and mechanisms of action. This not only allows for excellent complementary advantages in their weed-controlling properties, effectively delaying the occurrence and development of resistance in weeds to single-agent herbicides, but also produces an excellent synergistic effect. Specifically, compared to their single-agent counterparts, Epyrifenacil and terbutaline exhibit a superior synergistic effect, thereby significantly improving weed control efficacy, reducing pesticide dosage, lowering farmers' costs, and minimizing environmental impact. The Epyrifenacil and terbutaline in this herbicide, along with their specific ratio, exert a significant synergistic effect, thereby greatly enhancing the control efficacy against annual and perennial grasses and broadleaf weeds, while also broadening the weed-killing spectrum when Epyrifenacil and terbutaline are used as single components.

[0024] The herbicide provided by this invention can control multiple weeds simultaneously, has a broad spectrum of weed control, is convenient and efficient to use, and has a low dosage and minimal impact on the environment, thus achieving outstanding application results. Detailed Implementation

[0025] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] According to a first aspect of the invention, a herbicide is provided, the active ingredients of which include Epyrifenacil and terbutaline;

[0027] The weight ratio of Epyrifenacil to tertin is 1:0.01 to 1000.

[0028] Epyrifenacil is a uracil herbicide developed by Sumitomo Chemical Co., Ltd. Its mechanism of action is as a protoporphyrinogen oxidase (PPO) inhibitor. Chemical name: [(3-{2-chloro-5-[3,6-dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)pyrimidin-1(2H)-yl]-4-fluorophenoxy}-2-pyridine)oxy]ethyl acetate; CAS Registry Number: 353292-31-6; Molecular formula: C 21 H 16 ClF4N3O6.

[0029] Terbutylazine is a triazine inhibitor. Its common English name is terbutylazine, its chemical name is N2-tert-butyl-6-chloro-N4-ethyl-1,3,5-triazine-2,4-diamine, its CAS Registry Number is 5915-41-3, and its molecular formula is C9H. 16 Cl N5.

[0030] The herbicide provided by this invention combines Epyrifenacil and terbutaline, which have different structural types and mechanisms of action. This not only allows for excellent complementary advantages in their weed-controlling properties, effectively delaying the occurrence and development of resistance in weeds to single-agent herbicides, but also produces an excellent synergistic effect. Specifically, compared to their single-agent counterparts, Epyrifenacil and terbutaline exhibit a superior synergistic effect, thereby significantly improving weed control efficacy, reducing pesticide dosage, lowering farmers' costs, and minimizing environmental impact. The Epyrifenacil and terbutaline in this herbicide, along with their specific ratio, exert a significant synergistic effect, thereby greatly enhancing the control efficacy against annual and perennial grasses and broadleaf weeds, while also broadening the weed-killing spectrum when Epyrifenacil and terbutaline are used as single components.

[0031] In this invention, typical but non-limiting weight ratios of Epyrifenacil and tertin are, for example, 1:0.01, 1:0.1, 1:1, 1:2, 1:3, 1:4, 1:5, 1:10, 1:20, 1:30, 1:40, 1:50, 1:60, 1:70, 1:80, 1:90, 1:100, 1:150, 1:200, 1:250, 1:300, 1:350, 1:400, 1:450, 1:500, 1:550, 1:600, 1:650, 1:700, 1:750, 1:800, 1:850, 1:900, 1:950, and 1:1000.

[0032] In a preferred embodiment, the weight ratio of Epyrifenacil to tertidine can be 1:0.1 to 500, which is more conducive to further improving the synergistic effect of Epyrifenacil and tertidine. It is more preferably 1:1 to 500, and even more preferably 1:2 to 300.

[0033] In this invention, the content of the active ingredient in the herbicide can be varied within a wide range.

[0034] In a preferred embodiment, the active ingredient may constitute 1% to 99% of the herbicide by weight, with typical but non-limiting weight percentages such as 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, and 47%. %, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, and the range of values ​​formed by any two of the above values.

[0035] In a preferred embodiment, the active ingredient may account for 5-70% of the weight of the herbicide, which is more conducive to further improving the control effect of the herbicide on annual and perennial grass and broadleaf weeds, and is more preferably 10-50%.

[0036] In a preferred embodiment, the herbicide may contain, in addition to the active ingredient, at least one of agrochemically acceptable surfactants and a carrier.

[0037] The surfactants used in this invention are not particularly limited, and can be various surfactants known in the field of pesticide formulation, and are more preferably one or more of emulsifiers, dispersants and wetting agents.

[0038] The emulsifier can be any emulsifier known in the field of pesticide formulation. Specifically, the emulsifier in this invention can be, for example, calcium dodecylbenzenesulfonate, triphenylethylphenol polyoxyethylene ether phosphate, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, alkylphenol polyoxyethylene polyoxypropylene ether, fatty amine, ethylene oxide adduct of fatty amide, fatty acid polyoxyethylene ester, rosin acid ethylene oxide adduct, polyol fatty acid ester and its ethylene oxide adduct, styrene-phenyl polyoxyethylene ether, alkylphenol formaldehyde resin polyoxyethylene ether, hydroxyl-terminated polyoxyethylene polyoxypropylene ether, styrene-phenol formaldehyde resin, polyoxyethylene polyoxypropylene ether, and castor oil polyoxyethylene ether, or one or more of these. The dispersant can be any dispersant known in the field of pesticide formulation. Specifically, the dispersant in this invention can be, for example, one or more of the following: sodium salt of acrylic acid copolymer, disodium salt of maleate, sodium salt of naphthalenesulfonic acid formaldehyde condensate, rosin block polyoxyethylene ether polyoxypropylene ether sulfonate, hydroxyl-terminated polyoxyethylene polyoxypropylene ether block copolymer, triphenylethylphenol polyoxyethylene ether phosphate, fatty alcohol polyoxyethylene ether phosphate, and sodium salt of p-hydroxyphenyl lignin sulfonate and calcium lignin sulfonate. The wetting agent can be any wetting agent known in the field of pesticide formulation. Specifically, the wetting agent in this invention can be, for example, one or more of the following: sodium dodecyl sulfate, sodium secondary alkyl sulfate, sodium dodecylbenzene sulfonate, fatty alcohol polyoxyethylene ether, alkyl naphthalene sulfonate, and alkylphenol resin polyoxyethylene ether sulfate.

[0039] The carrier in this invention is not particularly limited, and can be any carrier known in the field of pesticide formulation, including but not limited to various silicates, carbonates, sulfates, oxides, phosphates, plant carriers, and synthetic carriers. Specifically, the carrier in this invention can be, for example, one or more of the following: silica, kaolin, diatomaceous earth, clay, talc, organobentonite, pumice, titanium dioxide, dextrin, cellulose powder, light calcium carbonate, soluble starch, corn starch, sawdust, urea, amine fertilizer, a mixture of urea and amine fertilizer, glucose, maltose, sucrose, anhydrous potassium carbonate, anhydrous sodium carbonate, anhydrous potassium bicarbonate, anhydrous sodium bicarbonate, attapulgite, a mixture of anhydrous potassium carbonate and anhydrous potassium bicarbonate, and a mixture of anhydrous sodium carbonate and anhydrous sodium bicarbonate.

[0040] In a preferred embodiment, the herbicide may also contain various formulation adjuvants commonly used in the field of pesticide formulation. Specifically, the formulation adjuvants in this invention may be one or more of solvents, cosolvents, thickeners, antifreeze agents, protectants, defoamers, disintegrants, stabilizers, preservatives, and binders.

[0041] In this invention, the solvent can be any solvent known in the field of pesticide formulation. Specifically, the solvent in this invention can be one or more of organic solvents, vegetable oils, mineral oils, solvent oils, and water. Among them, organic solvents include, but are not limited to, one or more of N-methylpyrrolidone, tetrahydrofuran, dimethyl sulfoxide, N,N-dimethyldecylamide, N,N-dimethylformamide, trimethylbenzene, tetramethylbenzene, xylene, toluene, octane, heptane, methanol, isopropanol, n-butanol, tetrahydrofurfuryl alcohol, tributyl phosphate, 1,4-dioxane, and cyclohexanone; vegetable oils include, but are not limited to, one or more of methylated vegetable oils, rosin-based vegetable oils, turpentine, epoxidized soybean oil, soybean oil, peanut oil, rapeseed oil, castor oil, corn oil, and pine nut oil; mineral oils include, but are not limited to, one or more of liquid waxes, engine oils, kerosene, and lubricating oils; the above solvents can also be used as co-solvents.

[0042] In this invention, the antifreeze can be any antifreeze known in the field of pesticide formulation, and the antifreeze of this invention is further preferably one or more of ethylene glycol, propylene glycol, glycerin, and urea; the thickener can be any thickener known in the field of pesticide formulation, specifically, the thickener of this invention can be one or more of xanthan gum, polyvinyl alcohol, polyacryl alcohol, polyethylene glycol, silica, diatomaceous earth, kaolin, clay, sodium alginate, magnesium aluminum silicate, sodium aluminum silicate, carboxymethyl cellulose, sodium hydroxypropyl cellulose, and organobentonite; the defoamer can be any defoamer known in the field of pesticide formulation, and the defoamer of this invention is further preferably one or more of organosiloxane, tributyl phosphate, and silicone; the stabilizer can be one or more of triphenyl phosphite, epichlorohydrin, and acetic anhydride; the preservative can be one or more of benzoic acid, sodium benzoate, 1,2-benzisothiazolin-3-one (BIT), Kathon, and potassium sorbate.

[0043] In a preferred embodiment, the herbicide formulation can be any of the commonly used formulations in the art, including but not limited to at least one of emulsifiable concentrates, water-in-oil emulsions, aqueous suspensions, suspension emulsions, dispersible oil suspensions, wettable powders, and water-dispersible granules. All of the above formulations can be prepared by conventional methods in the art, and the present invention does not have any special requirements in this regard.

[0044] In a preferred embodiment, the emulsifiable concentrate formulation comprises the following components by weight percentage:

[0045] Active ingredient 1-95%, cosolvent 0-20%, emulsifier 1-30%, solvent to make up to 100%.

[0046] The preparation method of the above-mentioned emulsifiable concentrate formulation may include, for example, mixing and stirring the active ingredients, solvent, cosolvent and emulsifier to form a uniform and transparent oil phase, thereby obtaining the emulsifiable concentrate formulation.

[0047] In a preferred embodiment, the aqueous emulsion or microemulsion comprises the following components by weight percentage:

[0048] Active ingredient 1-95%, emulsifier 1-30%, cosolvent 0-30%, solvent 1-30%, antifreeze 0-10%, thickener 0-10%, water to 100%.

[0049] The preparation method of the above-mentioned water-in-oil emulsion may include, for example, mixing the active ingredient, emulsifier, cosolvent and solvent to form a homogeneous oil phase; mixing water, thickener and antifreeze to form a homogeneous aqueous phase; and adding the aqueous phase to the oil phase or the oil phase to the aqueous phase under high-speed shearing to form a water-in-oil emulsion with good dispersibility.

[0050] In a preferred embodiment, the aqueous suspension comprises the following components by weight percentage:

[0051] Active ingredient 1-95%, surfactant 1-30%, antifreeze 1-10%, thickener 0.1-5%, water to 100%.

[0052] The preparation method of the above-mentioned aqueous suspension may include, for example, adding active ingredients, surfactants and additives to a sand mill in water as a medium, grinding to a certain particle size and then filtering; then adding a metered thickener to the ground mother liquor, shearing and dispersing evenly to prepare an aqueous suspension.

[0053] In a preferred embodiment, the water-dispersible granules or wettable powder comprise, by weight percentage, the following components:

[0054] The active ingredient comprises 1-95%, the surfactant comprises 1-30%, and other carriers are supplemented to make up to 100%.

[0055] The preparation method of the above-mentioned water-dispersible granules may include, for example, mixing the active ingredient, dispersant, wetting agent and carrier evenly, then pulverizing them to a certain particle size by airflow, adding water and kneading, and finally adding them to a granulator for granulation and drying to obtain water-dispersible granules or soluble granules.

[0056] The preparation method of the above-mentioned wettable powder may include, for example, fully mixing the active ingredients, various additives and other carriers and fillers, and then pulverizing them with an ultrafine pulverizer.

[0057] The herbicide of this invention uses Epyrifenacil and terbutaline as components in combination, exhibiting a significant synergistic effect. This enhances the control efficacy of these two components against annual and perennial grasses and broadleaf weeds, while also broadening the weed-killing spectrum when used as single active ingredients. The herbicide of this invention combines active ingredients with different mechanisms of action, allowing for excellent synergistic effects of each component's weed-killing properties. This effectively delays the development and progression of weed resistance to single-agent herbicides, simultaneously controlling multiple weeds. It is convenient and highly effective, significantly improving weed control while reducing dosage, thus lowering farmers' pesticide costs and environmental impact.

[0058] The herbicide of the present invention can be provided as a finished formulation, i.e., the substances are already mixed, or it can be provided as a separate formulation, which is mixed in a bucket or tank before use, and then selectively diluted with water according to the desired concentration of active substances. Furthermore, the herbicide of the present invention can also be used in combination with other compounds having fungicidal, insecticidal, or herbicidal properties, and can also be used in combination with nematicides, protective agents, growth regulators, phytonutrients, or soil conditioners.

[0059] According to a second aspect of the present invention, the application of the herbicide described in any of the preceding claims in the control of grassy and broadleaf weeds is provided.

[0060] The herbicide of the present invention can effectively control annual and perennial grasses and broadleaf weeds. Furthermore, the herbicide of the present invention can effectively control annual and perennial grasses and broadleaf weeds in corn fields.

[0061] In a preferred embodiment, the weeds may be at least one of the following: foxtail grass, barnyard grass, crabgrass, goosegrass, creeping jenny, dayflower, purslane, thistle, lambsquarters, amaranth, and sow thistle.

[0062] The inventors unexpectedly discovered that the herbicide of this invention is extremely effective in controlling foxtail grass, crabgrass, purslane, and amaranth, while also being highly safe for crops (such as corn).

[0063] Generally, the herbicide of this invention is applied as a foliar spray in the corn field during the 3-5 leaf stage of corn and the 2-5 leaf stage of weeds. This foliar spraying method is simple. Furthermore, the application rate of the herbicide of this invention, through appropriate formulation, can mitigate the impact of climate.

[0064] Therefore, the herbicide provided by this invention can control multiple weeds simultaneously, has a broad spectrum of weed control, is convenient and efficient to use, and has a low dosage and minimal impact on the environment, thus achieving outstanding application results.

[0065] The present invention will be further illustrated below by way of examples. Unless otherwise specified, the materials in the examples were prepared according to existing methods or purchased directly from the market. Epyrifenacil technical grade was prepared in-house (purity 95% by weight); terbutaline was commercially available (purity 97% by weight).

[0066] Example 1

[0067] A herbicide, which is a dispersible oil suspension, wherein the active ingredients are Epyrifenacil and terbutaline, and the weight percentage of the active ingredients is 15%.

[0068] The specific formulation of this herbicide is as follows:

[0069] Epyrifenacil 50g, tert-butyl 100g, castor oil polyoxyethylene ether (40) 60g, triphenylethylphenol polyoxyethylene ether phosphate 50g, silica 40g, methyl oleate to 1000g.

[0070] The preparation method of this herbicide includes:

[0071] Using methyl oleate as a medium, Epyrifenacil, tert-butyl ether, castor oil polyoxyethylene ether (40), triphenylethylphenol polyoxyethylene ether phosphate and silica were added to a sand mill and ground in proportion to obtain a dispersible oil suspension containing 15% by weight of active ingredients.

[0072] Example 2

[0073] A herbicide, a suspension concentrate, wherein the active ingredients are Epyrifenacil and terbutaline, and the weight percentage of the active ingredients is 30.1%.

[0074] The specific formulation of this herbicide is as follows:

[0075] Epyrifenacil 1g, tert-butyl ether 300g, rosin block polyoxyethylene ether polyoxypropylene ether sulfonate 30g, polycarboxylate 40g, ethylene glycol 60g, silica 60g, silicone defoamer 10g, water to make up to 1000g.

[0076] The preparation method of this herbicide includes:

[0077] Using water as a medium, Epyrifenacil, tert-butylamine, rosin block polyoxyethylene ether polyoxypropylene ether sulfonate, polycarboxylate, ethylene glycol, silica, silicone defoamer, and water were added to a shearing kettle in proportion. After shearing evenly, the mixture was placed in a sand mill and ground to obtain a suspension containing 30.1% by weight of active ingredients.

[0078] Example 3

[0079] A herbicide, which is a suspension emulsion, contains Epyrifenacil and terbutaline as active ingredients, with the active ingredients accounting for 21% by weight.

[0080] The specific formulation of this herbicide is as follows:

[0081] Epyrifenacil 10g, tertidine 200g, N-methylpyrrolidone 250g, sodium dodecylbenzenesulfonate 30g, castor oil polyoxyethylene ether (20) 40g, xanthan gum 30g, glycerol 60g, water to make up to 1000g.

[0082] The preparation method of this herbicide includes:

[0083] Using water as a medium, tert-butylamine, sodium dodecylbenzene sulfonate, castor oil polyoxyethylene ether (20), xanthan gum and glycerol were added to a sand mill and ground to obtain tert-butylamine water suspension.

[0084] Epyrifenacil, N-methylpyrrolidone, sodium dodecylbenzenesulfonate and castor oil polyoxyethylene ether (20) were thoroughly mixed to obtain the oil phase;

[0085] The oil phase was added to the tertidine suspending agent to obtain a suspension emulsion containing 21% by weight of the active ingredient.

[0086] Example 4

[0087] A herbicide, which is a water-dispersible granule, wherein the active ingredients are Epyrifenacil and terbutaline, and the weight percentage of the active ingredients is 51%.

[0088] The specific formulation of this herbicide is as follows:

[0089] Epyrifenacil 10g, tertidine 500g, rosin block polyoxyethylene ether polyoxypropylene ether sulfonate 120g, alkylphenol resin polyoxyethylene ether sulfate 60g, starch 80g, diatomaceous earth to make up to 1000g.

[0090] The preparation method of this herbicide includes:

[0091] Epyrifenacil, tertidine, rosin block polyoxyethylene ether polyoxypropylene ether sulfonate, alkylphenol resin polyoxyethylene ether sulfate, starch and diatomaceous earth are mixed and pulverized in proportion, and then extruded and granulated to obtain a water-dispersible granule containing 51% by weight of active ingredients.

[0092] Example 5

[0093] A herbicide, which is a wettable powder, wherein the active ingredients are Epyrifenacil and terbutaline, and the weight percentage of the active ingredients is 81%.

[0094] The specific formulation of this herbicide is as follows:

[0095] Epyrifenacil 10g, tert-butylamine 800g, hydroxyl-terminated polyoxyethylene polyoxypropylene ether block copolymer 50g, sodium lignosulfonate 60g, silica 20g, and kaolin to make up to 1000g.

[0096] The preparation method of this herbicide includes:

[0097] Epyrifenacil, tert-butylamine, hydroxyl-terminated polyoxyethylene polyoxypropylene ether block copolymer, sodium lignosulfonate, silica, and kaolin are mixed and pulverized in a certain proportion to prepare a wettable powder containing 81% by weight of active ingredients.

[0098] Example 6

[0099] An emulsifiable concentrate containing epyrifenacil and terbutaline as active ingredients, comprising 20.2% by weight of the active ingredients.

[0100] The specific formulation of this herbicide is as follows:

[0101] Epyrifenacil 2g, tertidine 200g, dimethyl sulfoxide (solvent) 200g, castor oil polyoxyethylene ether (40) (emulsifier) ​​30g, calcium dodecyl sulfonate 70g, solvent oil 200# (solvent) to make up to 1kg.

[0102] The preparation method of this herbicide includes:

[0103] Epyrifenacil, tertidine, dimethyl sulfoxide, castor oil polyoxyethylene ether (40), calcium dodecyl sulfonate and solvent oil 200# were mixed in proportion to form a homogeneous oil phase, resulting in an emulsifiable concentrate containing 20.2% by weight of active ingredients.

[0104] Examples 7-10

[0105] The difference between Examples 7-10 and Example 3 is that the weight ratios of Epyrifenacil and terbutaline in Examples 7-10 are 1:0.01, 1:0.1, 1:1, and 1:10, respectively. All other ratios are the same as in Example 3, resulting in a herbicide.

[0106] Examples 11-15

[0107] The difference between Examples 11-15 and Example 3 is that the weight ratios of Epyrifenacil and terbutaline in Examples 11-15 are 1:200, 1:400, 1:600, 1:800, and 1:1000, respectively. All other ratios are the same as in Example 3, resulting in a herbicide.

[0108] Comparative Example 1

[0109] This comparative example provides a herbicide, which is a suspension concentrate, and its active ingredient is only Epyrifenacil, which accounts for 30% by weight.

[0110] Comparative Example 2

[0111] This comparative example provides a herbicide, which is a suspension concentrate, and its active ingredient is only terbutaline, which accounts for 50% by weight.

[0112] Comparative Example 3

[0113] The difference between this comparative example and Example 3 is that the weight ratio of Epyrifenacil and terbutaline in this comparative example is 1:0.005, while the rest is the same as in Example 3, resulting in a herbicide.

[0114] Comparative Example 4

[0115] The difference between this comparative example and Example 3 is that the weight ratio of Epyrifenacil and terbutaline in this comparative example is 1:1500, while the rest is the same as in Example 3, resulting in a herbicide.

[0116] Experimental Example 1

[0117] The field weeding efficacy of the herbicides in Examples 1-15 and Comparative Examples 1-4 was tested. The application method was as follows: the maize variety was Zhengdan 958, and the test site was Xinzhouying Village, Zhaoquanying Town, Shunyi District, Beijing. Foliar spraying was performed once at the 4-leaf stage of maize and the 2-4-leaf stage of weeds, with a field spray volume of 30 L / mu. The spraying equipment was a backpack electric sprayer, model Jacto pjb-16, manufactured by Singapore Linong Pte Ltd. A total of 8 treatments were set up, with 4 replicates per treatment. The experimental plots were randomly arranged, with a plot area of ​​20 m². 2 On the 21st day after application, four 0.25m samples were randomly selected from each plot. 2 The sample points were surveyed to determine the fresh weight of each weed, and the weed control efficacy was calculated based on the formula.

[0118] Method for calculating prevention and control effectiveness:

[0119]

[0120] Where: PT - fresh weight of the drug-treated area; CK - fresh weight of the blank control area;

[0121] Efficacy results: At the tested dosage, 21 days after application, the herbicides in Examples 1-15 showed good control of both grasses and broadleaf weeds in the field.

[0122] The specific results are shown in the table below.

[0123] The herbicides used in the examples and comparative studies controlled the fresh weight of weeds in corn fields.

[0124]

[0125] Experimental Example 2

[0126] Referring to NY / T1155.4-2006, "Guidelines for Indoor Bioassay Testing of Pesticides - Herbicides - Part 4: Activity Assay Tests - Foliar Spray Method," the combined effects of Epyrifenacil and terbutaline against common grasses and broadleaf weeds were demonstrated through indoor toxicity testing.

[0127] Preparation of test reagents: Epyrifenacil technical grade and terbutaline technical grade were dissolved in an appropriate amount of acetone, and then prepared into the required concentrations with 0.1% Tween 80 aqueous solution; the dosage of terbutaline single agent was 100, 200, 300, and 400 g ai. / ha; the dosage of Epyrifenacil single agent was 1, 5, 10, and 15 g ai / ha.

[0128] Experimental Methods: The experiment employed a greenhouse pot cultivation method. Seeds of *Setaria viridis* (Grass family), *Digitaria sanguinalis* (Grass family), *Amaranthus retroflexus* (broadleaf weed), and *Portulaca oleracea* (broadleaf weed) were sown in small pots filled with 4 / 5 seedling substrate (nutrient soil: vermiculite = 3:1), with 5 × 5 seeds sown per pot, followed by 1 cm of soil cover. The pots were then placed in an artificial climate chamber for cultivation under the following conditions: 28℃ / 20℃, 14 h / D light duration, and 60% relative humidity. Water was added to the trays containing the small pots using the bottom infiltration method. After emergence, thinning and spacing were performed to ensure that each pot contained 10 uniformly growing weeds that did not obstruct each other. When the weeds reached the 2-leaf stage, foliar spraying was performed using an ASS-5 mobile spray tower, with each treatment replicated three times. A 0.1% Tween-80 aqueous solution was used as a blank control. After the pesticide solution has completely air-dried, the weeds are transferred to an artificial climate chamber for further cultivation. The fresh weight of the topsoil of the weeds in each treatment is investigated after 21 days. Except for 1-2 days after spraying, water regularly to maintain soil moisture.

[0129] The weed control efficacy is calculated using the following formula:

[0130]

[0131] Evaluation of synergistic effects: Refer to NY / T1155.7-2006, "Guidelines for Indoor Bioassay Testing of Pesticides - Herbicides Part 7: Determination of Synergistic Effects of Herbicides Mixed". The Gowing method was used to evaluate the synergistic effects of herbicides, calculated using the formula E0 = X + Y(100-X) / 100; where: X is the weed control efficacy of herbicide A at dosage P; Y is the weed control efficacy of herbicide B at dosage Q; E0 is the theoretical weed control efficacy of herbicide A at dosage P and the theoretical weed control efficacy of herbicide B at dosage Q; E is the measured weed control efficacy of herbicides A and B mixed in the above proportions.

[0132] Evaluation criteria: When E-E0 > 10%, it indicates that the mixed herbicide has a synergistic effect; when E-E0 < -10%, it indicates that the mixed herbicide has an antagonistic effect; when the E-E0 value is between ±10%, it indicates that the mixed herbicide has an additive effect.

[0133] The combined effect of Epyrifenacil and terbutaline on grass weeds was tested, and the ratio and results are shown in Table 1:

[0134] Table 1. Bioassay results of the combination of Epyrifenacil and tertidine on foxtail grass and crabgrass.

[0135]

[0136] The results in Table 1 show that the combination of Epyrifenacil and terbutaline significantly improved the weed control effect compared with their individual use, and the dosage of the solution showed a significant synergistic effect on both foxtail grass and crabgrass.

[0137] The combined effects of the Epyrifenacil and tertidine composition on Amaranthus retroflexus and Portulaca oleracea were tested, and the ratio and results are shown in Table 2.

[0138] Table 2. Bioassay results of the combination of Epyrifenacil and terbutaline on Amaranthus retroflexus and Portulaca oleracea.

[0139]

[0140] The results in Table 2 show that the combination of Epyrifenacil and terbutaline significantly improved the weed control effect compared with their individual use, and the dosage of the combined formulation showed a significant synergistic effect on both broadleaf weeds, Amaranthus retroflexus and Portulaca oleracea.

[0141] In conclusion, the combined effect of Epyrifenacil and tertin on the four weeds, when mixed in a certain proportion, showed a synergistic effect within the experimental range.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A herbicide, characterized in that, The active ingredients of the herbicide include Epyrifenacil and terbutaline; The weight ratio of Epyrifenacil to tertin is 1:10~400.

2. The herbicide according to claim 1, characterized in that, The active ingredient accounts for 1-99% of the weight of the herbicide.

3. The herbicide according to claim 2, characterized in that, The active ingredient accounts for 5-70% of the weight of the herbicide.

4. The herbicide according to claim 3, characterized in that, The active ingredient accounts for 10-50% of the weight of the herbicide.

5. The herbicide according to any one of claims 1-4, characterized in that, The herbicide also includes at least one of agrochemically acceptable surfactants and carriers.

6. The herbicide according to any one of claims 1-4, characterized in that, The herbicide formulation includes at least one of emulsifiable concentrate, water-in-oil emulsion, water suspension, suspension emulsion, dispersible oil suspension, wettable powder, and water-dispersible granules.

7. The use of the herbicide according to any one of claims 1-6 in controlling grassy and broadleaf weeds.

8. The application according to claim 7, characterized in that, The herbicide is used to control grassy and broadleaf weeds in cornfields.

9. The application according to claim 8, characterized in that, The weeds include at least one of the following: foxtail grass, barnyard grass, crabgrass, goosegrass, purslane, dayflower, purslane, thistle, lambsquarters, amaranth, and sow thistle.

10. The application according to claim 8, characterized in that, The weeds are at least one of foxtail grass, crabgrass, purslane, and amaranth.

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