Herbicidal compositions of pyroxasulfone and diclosulam and their use

Abstract

The application discloses a kind of metrafenone and double chlorosulfamid compound herbicidal composition and application thereof, and relates to the technical field of pesticide herbicide.The technical scheme includes effective active ingredient and auxiliary ingredient, and the effective active ingredient is metrafenone and double chlorosulfamid, and the mass ratio of the two is (0.025-40):1.The application utilizes metrafenone and double chlorosulfamid different action mechanism to prepare herbicidal composition, produces significant synergistic effect, and is used for preventing and treating annual gramineous weeds and broad-leaved weeds in dry field crop field, with the advantages of wide herbicidal spectrum, small dosage and low cost.

Description

Technical Field

[0001] This invention relates to the field of pesticide and herbicide technology, specifically to a herbicidal composition of sulfonylpyrazole and dichlorvos and its application. Background Technology

[0002] Sulfonazole is an isoxazole herbicide with the chemical name [3-[(5-difluoromethoxy-1-methyl-3-trifluoromethylpyrazol-4-yl)-methylsulfonyl]-4,5-dihydro-5,5-dimethyl-1,2-oxazole], and its structural formula is as follows: .

[0003] Sulfonazole belongs to the K3 class of herbicides. Its mechanism of action is to inhibit cell division and significantly inhibit the biosynthesis of C20-C30 very long-chain fatty acids (VLCFAs) in plants. This herbicide is mainly absorbed through the young roots and shoots of weeds, thereby inhibiting early seedling growth, damaging meristems and coleoptiles, and exerting its weed-controlling effect. Its application is primarily as a pre-emergence soil-sealing treatment. It can be applied after winter wheat sowing and is also suitable for fields of various crops such as corn, wheat, soybeans, cotton, sunflowers, potatoes, and peanuts. It effectively controls annual grasses such as wild oats, large-spike alfalfa, shepherd's purse, shepherd's purse, foxtail grass, barnyard grass, Kentucky bluegrass, canary grass, crabgrass, dragon claw grass, goosegrass, false sorghum, and ryegrass, as well as annual broadleaf weeds such as long-awned amaranth, millet grass, black nightshade, retroflexus amaranth, and purslane.

[0004] Biclosulfonamide is a triazolopyrimidine sulfonamide herbicide, N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-[1,2,4]triazolo[1,5-c]pyrimidine-2-sulfonamide, with the following structural formula: .

[0005] Sulfuron-methyl is an acetolactate synthase (ALS) inhibitor. It inhibits the biosynthesis of branched-chain amino acids in weeds, blocks protein synthesis, and suppresses cell division, causing weed growth to stop and eventually die. It can control annual broadleaf weeds in soybean fields such as amaranth, purslane, velvetleaf, and knotweed.

[0006] In agricultural production, weeds severely impact crop growth and yield. Chemical weeding, as the most economical and effective method, plays a crucial role in weed control in farmland. However, long-term, continuous, high-dose use of single-variety or single-mode chemical herbicides can easily lead to problems such as weed resistance and the evolution of resistance. Therefore, developing herbicidal compositions with high safety, broad spectrum of weed control, synergistic effects, and the ability to address resistant weeds has become an urgent priority. The compound herbicidal composition of sulfonylpyrazol and dichlorvos has emerged, providing a new solution for agricultural weed control. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to prepare a herbicidal composition by utilizing the different mechanisms of action of sulfonylpyrazole and dichlorvos to produce a significant synergistic effect, which can be used to control annual grass and broadleaf weeds in dryland crop fields, and has the advantages of broad spectrum of weed control, low dosage and low cost.

[0008] The technical solution of this invention is as follows: In the first aspect, a herbicidal composition of sulfonylpyrazole and dichloroxychloride is disclosed, comprising an active ingredient and an auxiliary ingredient, wherein the active ingredients are sulfonylpyrazole and dichloroxychloride in a mass ratio of (0.025-40):1.

[0009] Preferably, the mass ratio of sulfonylpyrazole to dichlorvos is 1:1.

[0010] Preferably, the total mass of the effective active ingredients sulfopyrazol and dichlorvos accounts for 5% to 80% of the mass of the composition.

[0011] Preferably, the auxiliary components include a carrier and an additive, wherein the carrier is one or more of water, a solvent or a filler, and the additive includes at least one surfactant.

[0012] Preferably, the solvent includes one or more of toluene, xylene, cyclohexanone, N-methylpyrrolidone, dimethyl sulfoxide, vegetable oil, mineral oil, methyl oleate, or solvent oil; the filler includes a mixture of one or more of kaolin, diatomaceous earth, bentonite, attapulgite, silica, starch, or light calcium carbonate; and the surfactant includes one or more of emulsifiers, dispersants, wetting agents, or penetrants.

[0013] The emulsifier may be selected from one or more of the following: calcium dodecylbenzenesulfonate, castor oil polyoxyethylene ether, alkylphenol polyoxyethylene ether, styrylphenol polyoxyethylene ether, polyoxyethylene polyoxypropylene block copolymer, and fatty alcohol polyoxyethylene ether (AEO-9).

[0014] The dispersant may be selected from one or more of the following: lignin sulfonate, naphthalene sulfonate formaldehyde condensate, polycarboxylate, fatty acid polyoxyethylene ester, sodium methylene bis(naphthalene) sulfonate (NNO), dispersant FM, polyvinyl alcohol (PVA-1788), and polycarboxylate dispersant (D-5040).

[0015] The wetting agent may be selected from one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, and pull-apart powder.

[0016] Preferably, the additives further include one or more of the following: antifreeze, thickener, stabilizer, disintegrant, defoamer, or microencapsulation additive.

[0017] The antifreeze agent may be selected from one or more of ethylene glycol, propylene glycol, glycerin, and urea.

[0018] The stabilizer may be selected from one or more of xanthan gum, epichlorohydrin, and triphenyl phosphate.

[0019] The disintegrant may be selected from one or more of ammonium sulfate, sodium carboxymethyl starch, croscarmellose, and bentonite.

[0020] The defoamer may be selected from one or more of polyoxypropylene polyoxyethylene ether (such as GP-330), polysiloxane emulsion (such as BYK-024), and glyceryl monostearate.

[0021] The thickener includes one or more of xanthan gum and magnesium aluminum silicate.

[0022] The microcapsule additives include the capsule wall polymer monomer polymethylene polyphenyl polyisocyanate (PAPI / PM-200) and the capsule wall crosslinking agent ethylenediamine.

[0023] Preferably, the dosage form of the composition is a suspension, oil suspension, microcapsule suspension, water-dispersible granules, or wettable powder.

[0024] Secondly, the application of the composition is disclosed for controlling annual grass and broadleaf weeds in dryland crop fields. The herbicidal composition can effectively control grass weeds such as barnyard grass, crabgrass, foxtail grass, and goosegrass, as well as broadleaf weeds such as amaranth, lambsquarters, purslane, cocklebur, velvetleaf, and black nightshade.

[0025] Preferably, the dryland crop is wheat, corn, soybean or peanut.

[0026] Preferably, the herbicidal composition is applied as a pre-emergence soil spray treatment.

[0027] Sulfonazole is highly effective against annual grass weeds, while dichlorvos is excellent against annual broadleaf weeds and some sedges. When combined, the two herbs have complementary weed control spectrums, effectively controlling grass weeds such as barnyard grass, crabgrass, foxtail grass, and goosegrass, as well as broadleaf weeds such as amaranth, lambsquarters, purslane, cocklebur, velvetleaf, and black nightshade. This solves the problem of narrow weed control and incomplete weed control of single herbicides, and can meet the weed control needs of various dryland crops such as wheat, corn, soybeans, and peanuts.

[0028] Sulfonazole is a pre-emergence soil-sealing agent that effectively inhibits weed seed germination and the growth of young shoots and roots by suppressing very long-chain fatty acid elongation enzymes (VLCFAE). Dichlorfenapyr, an acetolactate synthase (ALS) inhibitor, can rapidly suppress the growth of broadleaf weeds and some sedges through systemic absorption via roots and young shoots. The combination of these two agents achieves multiple weed control effects—soil-sealing, pre-emergence weed control, and control of both broadleaf and grass weeds—forming a full-cycle, comprehensive weed control system. This multi-site synergistic weed control effect is impossible to achieve with a single agent. Simultaneously, the two active ingredients act on different targets within the weed, producing a metabolic synergistic effect that accelerates weed death.

[0029] Compared with the prior art, the present invention has the following advantages: 1. The mechanisms of action of sulfonylpyrazole and dichlorvos in this invention are different. When combined, they interfere with the physiological and biochemical processes of weeds through different sites of action, producing a significant synergistic effect. Compared with single-agent application, it can more effectively inhibit weed growth, improve the control effect of weeds, and reduce the recurrence rate of weeds. Experimental verification shows that, at the same dosage, the combined herbicidal composition of this invention has a higher control effect on a variety of weeds than single-agent application. The co-toxicity coefficient (CTC) of sulfonylpyrazole and dichlorvos is significantly greater than 120, which fully demonstrates its significant synergistic effect.

[0030] 2. The two herbicides in the herbicidal composition of the present invention have different mechanisms of action and no overlap in their sites of action. Weeds are unlikely to develop resistance to two herbicides with different mechanisms of action at the same time. By using them in combination, the frequency and dosage of using a single herbicide can be reduced, the formation and development of herbicide-resistant weed populations can be reduced, thereby delaying the development of herbicide resistance in weeds and extending the service life of the herbicides.

[0031] 3. The herbicidal composition of the present invention utilizes the synergistic effect of compounding. Under the premise of achieving the same herbicidal effect, the compound herbicidal composition of the present invention can significantly reduce the total amount of active ingredients used. Compared with the use of single agents, the total amount of pesticides used is reduced, which not only reduces agricultural production costs, but also reduces the pollution of soil, water sources and other environments by pesticides, which meets the requirements of green agriculture, ecological protection and high-quality agricultural development.

[0032] 4. The composition of the present invention, at the recommended dosage, is highly safe for dryland crops such as wheat, corn, soybeans, and peanuts, has minimal impact on non-target organisms, low toxicity to humans and animals, and good environmental compatibility.

[0033] 5. The composition of this invention has a scientific and reasonable formulation, readily available raw materials, simple preparation process, stable production performance, strong applicability, and low cost, making it suitable for industrial production and large-scale application in farmland. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. The synergistic effect of the herbicide of this invention on gramineous weeds and broadleaf weeds can be further illustrated by the following embodiments, but this invention is by no means limited thereto. The efficacy tests of this invention combine indoor pot experiments and field efficacy studies. Unless otherwise specified, all proportions mentioned below are mass ratios.

[0035] Example 1: 5% Sulfonazole·Biclosulfonamide oil suspension The aforementioned sulfonylpyrazole and dichlorvos compound herbicidal composition is a 5% sulfonylpyrazole·dichlorvos oil suspension. Specifically, it consists of: 4.17% sulfonylpyrazole, 0.83% dichlorvos, 3% emulsifier (castor oil polyoxyethylene ether, EL 40, Jiangsu Haian Petrochemical Plant), 2% polyoxyethylene polyoxypropylene block copolymer (Xingtai Lantian Fine Chemical Co., Ltd.), 3% dispersant (naphthalene sulfonate formaldehyde condensate, Shaoxing Zhenggang Chemical Co., Ltd.), 2% organobentonite, 1% silica, and methyl oleate carrier to a final volume of 100%. Sulfonazole, dichlorvos, emulsifier castor oil polyoxyethylene ether, polyoxyethylene polyoxypropylene block copolymer, dispersant naphthalene sulfonate formaldehyde condensate, filler organobentonite, and silica are added to methyl oleate oil phase carrier. The mixture is first pre-dispersed using a high-speed shear mill to form a uniform slurry. The slurry is then fed into a sand mill for wet grinding, controlling the grinding temperature and particle size until the average particle size of the material meets the specified requirements and the system is uniform and stable. After grinding, the mixture is filtered and tested to obtain the dispersible oil suspension.

[0036] Example 2: 30% Sulfonazole·Biclosulfonamide Aqueous Suspension Concentrate The aforementioned sulfonylpyrazole and dichlorvos compound herbicidal composition is a 30% sulfonylpyrazole·dichlorvos aqueous suspension, with the specific formula as follows: sulfonylpyrazole 28.57%, dichlorvos 1.43%, dispersant sodium lignosulfonate 3.5%, thickener xanthan gum 0.15%, thickener magnesium aluminum silicate 0.4%, antifreeze ethylene glycol 3%, defoamer GP-330 0.2%, and water to 100%. First, sulfonylpyrazole and dichlorvos are added to water, then the dispersant sodium lignosulfonate, xanthan gum, magnesium aluminum silicate, ethylene glycol, and defoamer are added. After stirring evenly, the mixture is ground in a sand mill until the particle size is less than 5μm, and finally homogenized and filtered to obtain the 30% sulfonylpyrazole·dichlorvos aqueous suspension. The main equipment includes a batching tank, a colloid mill or homogenizer, and a sand mill.

[0037] Example 3: 30% Sulfonazole·Pyrazosulfuron-methyl microcapsule suspension The aforementioned sulfonylpyrazole and dichlorvos compound herbicidal composition is a 30% sulfonylpyrazole·dichlorvos microcapsule suspension. The specific preparation method is as follows: 27.27% sulfonylpyrazole, 2.73% dichlorvos, 5% polymethylene polyphenyl polyisocyanate (PAPI / PM-200) (capsule wall polymer), 2.5% fatty alcohol polyoxyethylene ether (AEO-9) (emulsifier), 4% polyvinyl alcohol (PVA-1788) (dispersant), 2% polycarboxylate dispersant D-5040, 0.3% xanthan gum stabilizer, 3% ethylene glycol antifreeze, and S-150# solvent oil. 12%, ethylenediamine 1.75%, deionized water (for dissolving ethylenediamine) 1.75%, deionized water to 100%; First, add sulfonylpyrazole and dichlorvos to solvent oil S-150# and stir until completely dissolved. Then add the capsule wall polymerization monomer PAPI and stir to obtain the oil phase. Simultaneously, add emulsifier AEO-9, dispersant PVA-1788, dispersant D-5040, and ethylene glycol to the deionized water and stir to obtain the aqueous phase. Finally, add xanthan gum and disperse until no agglomeration occurs to obtain the aqueous phase. Then, the prepared oil phase is... Slowly add to the aqueous phase and emulsify at high speed of 10,000 rpm for 8 min to prepare a stable oil-in-water emulsion. After completion, reduce the stirring speed to 500 rpm, raise the temperature to 55℃ and slowly add ethylenediamine aqueous solution. Keep the reaction at this temperature for 3 h to promote interfacial polymerization between isocyanate and polyamine to form polyurea capsule walls. After the reaction is completed, cool to room temperature, adjust the pH of the system to 7.0 with dilute sodium hydroxide aqueous solution, add deionized water to make up the system to 100%, and stir to homogenize to obtain 30% sulfonylpyrazol·dichloroxychloride microcapsule suspension.

[0038] Example 4: 30% Sulfonazole·Pyrazosulfuron-methyl wettable powder The aforementioned sulfonylpyrazole and dichlorvos compound herbicidal composition is a 30% sulfonylpyrazole·dichlorvos wettable powder. The specific preparation method is as follows: take 25% sulfonylpyrazole, 5% dichlorvos, 3% dispersant Reax 81A (lignin sulfonate), 2% wetting agent, 40% diatomaceous earth, 15% bentonite, and 10% silica. Mix the above components evenly and then pulverize them by airflow to obtain the 30% sulfonylpyrazole·dichlorvos wettable powder.

[0039] Example 5: 80% Sulfonazole·Pyrazosulfuron-methyl water-dispersible granules The aforementioned sulfonylpyrazole and dichlorvos compound herbicidal composition is an 80% sulfonylpyrazole·dichlorvos water-dispersible granule. The formulation of the dispersible granule is as follows: sulfonylpyrazole 40%, dichlorvos 40%, dispersant polycarboxylate D-5040 4%, wetting agent sodium dodecyl sulfate 1.5%, disintegrant ammonium sulfate 3%, filler kaolin 2.5%, and silica 9%.

[0040] The preparation method is as follows: Active ingredients sulfonylpyrazol and dichlorvos are added to a carrier filler, along with a wetting agent sodium dodecyl sulfate, a dispersant polycarboxylate, and a disintegrant ammonium sulfate. The mixture is then air-jet pulverized, and 10-25% water is added. The mixture is then kneaded, granulated, dried, and sieved to obtain a water-dispersible granule product. Alternatively, the pulverized powder is sprayed with water, granulated, dried, and then sieved in a fluidized bed granulator to obtain the product. The main equipment includes a mixer, air-jet pulverizer, kneader, extrusion granulator, drying oven or fluidized bed dryer, or fluidized bed granulator and sieve.

[0041] 1. An indoor combined toxicity bioassay was conducted to verify the synergistic effect of the combination of sulfopyrazol and dichlorvos.

[0042] 1.1 Test reagents Sulfonazole technical grade: purity ≥98%, purchased from Shandong Binnong Technology Co., Ltd.

[0043] Dichlorfenapyr technical grade: purity ≥95%, purchased from Hubei Weideli Chemical Technology Co., Ltd.

[0044] 1.2 Test Target Broadleaf weeds: Purslane 1.3 Experimental Design Indoor bioactivity was determined using the greenhouse pot test method. Following NY / T 1155.6-2006, 30 purslane seeds that had reached the budding stage were sown in each 12cm diameter plastic pot filled with a well-mixed potting mix (flowering soil: vermiculite 2:1), covered with a 1cm layer of soil, and placed in a controlled-sunlight greenhouse. During the experiment, the daytime temperature in the greenhouse was (25±2)℃, the nighttime temperature was (20±2)℃, the photoperiod was 16L / 8D, and the light intensity was 1400μmol / (m²). 2 •s), relative humidity (70±5)%. After sowing and covering with soil, and before weed emergence, soil spraying was carried out using a sprayer with a spray volume of 450 L / hm. 2 The spray pressure is 0.275 MPa.

[0045] Pesticide preparation: The test pesticide was prepared by first preparing a stock solution, and then diluting it sequentially to the required dosage (active ingredient). Each treatment was replicated four times. After application, detailed records of weed symptoms were recorded, such as growth inhibition, leaf yellowing, and malformation. 21 days after treatment, the above-ground fresh weight of weeds from each treatment was harvested and weighed to calculate the fresh weight inhibition rate. The fresh weight inhibition rate was used to evaluate the pesticide's toxicity to the target.

[0046] 1.4 Data Statistics and Analysis Fresh weight inhibition rate (%) = [(fresh weight of plants in blank control area - fresh weight of plants in treatment area) / fresh weight of plants in blank control area] × 100 Combined effect evaluation method: DPS software was used to analyze and calculate the toxicity equation, LC50 value (mg / L) and co-toxicity coefficient.

[0047] Using the logarithm of the drug concentration (mg / L) as the independent variable x and the probability of fresh weight inhibition rate as the dependent variable y, toxicity regression equations were established. The LC ratios for single-dose and various formulations were calculated using DPS software. 50 The toxicity index and co-toxicity coefficient (CTC) were calculated according to Sun Yunpei's method. The calculation formula is as follows: (using sulfonylpyrazine as the standard agent, its toxicity index is 100): Actual Toxicity Index (ATI) = (LC50 of Standard Reagent / LC50 of Test Reagent) × 100 Theoretical Toxicity Index (TTI) = ∑ (Toxicity Index (ATI) of a certain active ingredient × Percentage content of the active ingredient in the mixture) Co-toxicity coefficient (CTC) = [Actual toxicity index (ATI) of the mixture / Theoretical toxicity index (TTI) of the mixture] × 100 When CTC is greater than 120, it has a synergistic effect; when it is less than 80, it has an antagonistic effect; and when it is between 80 and 120, it has an additive effect.

[0048] 1.5 Measurement Results 1.5.1 The toxicity test results of the combination of sulfonylpyrazine and dichlorvos on purslane are shown in Table 1.

[0049] Table 1. Results of toxicity assay of different ratios of active ingredients on purslane

[0050] As can be seen from the table above, when the mass ratio of sulfonylpyrazole to dichlorvos is (0.025-40):1, the co-toxicity coefficient is greater than 120, indicating that the combination of sulfonylpyrazole and dichlorvos exhibits a synergistic effect on purslane. In particular, when the mass ratio of sulfonylpyrazole to dichlorvos is 1:1, the synergistic effect is the most obvious, with a co-toxicity coefficient of 170.

[0051] 2. Field efficacy trials were conducted to further demonstrate that the combination of sulfopyrazine and dichlorvos has a synergistic effect.

[0052] To better illustrate the effective control effect of the present invention, the sulfonylpyrazole·dichloroxychloride herbicidal composition prepared in Examples 1-5 above was used to conduct a field efficacy comparison test on pre-emergence soil sealing in soybean fields with commercially available 40% sulfonylpyrazole suspension (SC) and 84% dichloroxychloride water dispersible granules (WG). The test results are shown in Tables 2 and 3 below.

[0053] The Honda efficacy test included treatments for a compound formulation, a single-dose control, and a blank water control. Each test plot was 50 m² in size.2 Each treatment was replicated four times, and the experimental plots were arranged in a randomized block design. A 0.5m isolation row was set up between individual plots and around the perimeter of the entire experimental field to prevent pesticide drift and cross-interference of water and fertilizer in the experimental data. A Gongnong-16 backpack manual sprayer was used for conventional soil spraying for pre-emergence control treatment. The spraying was conducted after soybean sowing and covering with soil, but before soybean emergence. The water treatment group served as a blank control. There was no rainfall in the experimental area for 24 hours after application, and no extreme weather events such as heavy rain or high-temperature freezing occurred during the experimental period. The experimental field followed standard soybean field management for water, fertilizer, and pests and diseases throughout the entire process. Weed control efficacy was assessed twice, at 15 days and 30 days after application, and the number of surviving weeds was recorded simultaneously.

[0054] During the experimental period, soybean emergence rate, seedling growth, hypocotyl and cotyledon status were visually observed at 3, 7, 15, and 30 days after application to determine whether each pre-emergence soil treatment agent caused phytotoxicity symptoms such as inhibited emergence, uneven emergence, seedling scorching, and stunted growth. The target weeds were selected from the soybean field: barnyard grass, crabgrass, foxtail, and purslane (four grasses) and broadleaf weeds for soil-applied weed control efficacy testing. The entire experiment strictly followed the national standard GB / T17980.30-2000, "Guidelines for Field Efficacy Testing of Pesticides". Weed surveys were conducted using a five-point diagonal sampling method in each plot, with a single sample plot area of ​​0.25 m². 2 The number of germinating and surviving weed plants within the designated quadrats was counted. The weed control efficacy calculation formula followed the national standard for pesticide efficacy calculation. The efficacy calculation method is as follows:

[0055] Table 2. Results of the 15-day efficacy test of pesticides in controlling weeds in soybean fields.

[0056] Table 3. Results of the 30-day efficacy test of pesticides in controlling weeds in soybean fields.

[0057] Based on the above field trial data, it can be concluded that: after the two active ingredients are combined, at 15 and 30 days post-application, the combined herbicides of Examples 1-5 of this invention, after pre-emergence soil sealing treatment in soybean fields, showed significantly better overall control effects against gramineous and broadleaf weeds than the single-agent control agents 40% sulfonylpyrazole SC and 84% dichlorvos WG. At 15 and 30 days post-application, the average soil sealing efficacy of the five formulations of the combined herbicides of this invention exceeded 90%, proving that the optimal combination of sulfonylpyrazole and dichlorvos has a very strong synergistic effect in soil sealing weed control; among them, the water-dispersible granules of Example 5, prepared by combining the two in a fixed ratio, showed the best overall sealing efficacy, with sealing efficacy of over 98% against all four target weeds at both post-application survey points. During the experiment, it was observed that 40% sulfonamide SC soil-applied herbicides exhibited excellent suppression of annual grass weeds, but had a shorter residual effect on broadleaf weeds. In contrast, 84% dichlorvos WG showed a prominent inhibitory effect on broadleaf weed seed germination. The two products complemented each other, and the combined formula provided long-lasting suppression and killing effects on various weed seeds in soybean fields. The experiment demonstrated that this compound significantly improved the efficacy of pre-emergence soil-applied herbicides, broadened the spectrum of herbicides used in soybean fields, reduced the amount of herbicide used, and decreased production costs, pesticide residues, and farmland environmental pollution.

[0058] Furthermore, through the above indoor activity tests and pre-emergence field efficacy trials in soybean fields, it was found that after soil treatment with each herbicide in the examples, soybeans emerged uniformly and grew vigorously, without any inhibition of emergence, plant deformities, or yellowing caused by herbicides. The herbicides are highly safe for soybeans and beneficial organisms in the surrounding field, and have good compatibility with farmland soil and the surrounding ecological environment. The herbicidal composition of this invention has the advantages of long-lasting pre-emergence efficacy, low dosage, rapid weed suppression, and delaying the development of herbicide resistance in the soil seed bank of weeds. Therefore, the compound formulation of sulfonylpyrazol and dichlorvos is suitable for pre-emergence soybean application and is an ideal pre-emergence compound herbicide product for soybean fields. The research and promotion of this invention is of great significance for the stable yield and income increase of large-scale soybean planting and the protection of the farmland ecological environment.

[0059] Although the present invention has been described in detail by way of preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A herbicidal composition of sulfonylpyrazole and dichlorvos, characterized in that, It includes active ingredients and auxiliary ingredients. The active ingredients are sulfopyrazine and dichlorvos, with a mass ratio of (0.025-40):

1.

2. The herbicidal composition of sulfonylpyrazole and dichlorvos as described in claim 1, characterized in that, The mass ratio of sulfonylpyrazole to dichlorvos is 1:

1.

3. The herbicidal composition of sulfonylpyrazole and dichlorvos as described in claim 1, characterized in that, The total mass of the effective active ingredients sulfonylpyrazol and dichlorvos accounts for 5% to 80% of the mass of the composition.

4. The herbicidal composition of sulfonylpyrazole and dichlorvos as described in claim 1, characterized in that, The auxiliary components include a carrier and an additive, wherein the carrier is one or more of water, a solvent or a filler, and the additive includes at least one surfactant.

5. The herbicidal composition of sulfonylpyrazole and dichlorvos as described in claim 4, characterized in that, The solvent includes one or more of toluene, xylene, cyclohexanone, N-methylpyrrolidone, dimethyl sulfoxide, vegetable oil, mineral oil, methyl oleate, or solvent oil; the filler includes a mixture of one or more of kaolin, diatomaceous earth, bentonite, attapulgite, silica, starch, or light calcium carbonate; the surfactant includes one or more of emulsifiers, dispersants, wetting agents, or penetrants.

6. The herbicidal composition of sulfonylpyrazole and dichlorvos as described in claim 4, characterized in that, The additives also include one or more of the following: antifreeze, thickener, stabilizer, disintegrant, defoamer, or microencapsulation additive.

7. The herbicidal composition of sulfonylpyrazole and dichlorvos as described in claim 1, characterized in that, The composition is in the form of a suspension, oil suspension, microcapsule suspension, water-dispersible granules, or wettable powder.

8. The use of the composition according to any one of claims 1-7, characterized in that, Used to control annual grasses and broadleaf weeds in dryland crop fields.

9. The application of the composition according to claim 8, characterized in that, The dryland crops mentioned are wheat, corn, soybeans, or peanuts.

10. The application of the composition according to claim 8, characterized in that, The application method is pre-emergence soil spraying.

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