Weeding composition for preventing and treating inula flower and application thereof

Abstract

The invention discloses a weeding composition for preventing and treating inula flowers and application of the weeding composition, effective components of the weeding composition are cinmethylin and pinoxaden, and the weight ratio of cinmethylin to pinoxaden is (17-45): (3-31). The invention further discloses a herbicide, wherein the herbicide contains the weeding composition disclosed by the invention. The weeding composition and the herbicide can be used for preventing and treating the inula flowers, have excellent prevention and treatment effects, are high in safety, can overcome the problem of drug resistance, fill the blank of no targeted medicament for preventing and treating the inula flowers, and have important practical significance for preventing and treating the inula flowers.

Description

Technical Field

[0001] The present application belongs to the technical field of pesticide compound agents, and specifically relates to a herbicidal composition for controlling Inula japonica and its application. Background Art

[0002] Inula japonica Thunb. is a perennial herbaceous plant of the Asteraceae family and the genus Inula. The stem is long-haired, or the lower part is hairless; the middle leaves are oblong, oblong-lanceolate or lanceolate, and the base often has rounded semi-amplexicaul earlets, sessile, and the upper leaves are linear-lanceolate. Studies have shown that when Inula grows in rice fields, it will hang its fruits upside down on the rice, reducing the yield and quality of rice. In recent years, the occurrence of Inula in rice fields has been on the rise. So far, there is no registered pesticide specifically for the prevention and control of Inula in my country.

[0003] Compared with traditional weeds, the prevention and control of Inula has its own unique difficulty: from the perspective of its biological characteristics, Inula is a perennial herb with a developed root system and underground stems. Even if the above-ground part is removed, the underground organs can still regenerate quickly to form new plants; at the same time, it has strong stress resistance and can adapt to a variety of soil conditions. It has weak drought resistance but is resistant to barrenness and can still grow in harsh environments. Its perennial characteristics make it easy to form a dominant population in farmland, occupy space and compete for resources. From the perspective of drug resistance and drug limitations, Inula belongs to the Asteraceae and Convolvulaceae families, and shows natural resistance to common herbicides. In addition, Inula usually germinates quickly in spring, overlapping with the greening period of crops, and weeds grow faster and are prone to occupy resources. If they are not controlled in time during the seedling stage, they will be more difficult to eradicate after the root system matures in the later stage.

[0004] In general, the control of Inula japonica has its own unique difficulties compared to other weeds, and there is currently no pesticide with significant effect on the control of Inula japonica. Summary of the invention

[0005] In view of this, the primary purpose of the present application is to provide a herbicidal composition for controlling Inula fragrans, which contains a specific ratio of cyproconazole and pinoxaden. Cyproconazole and pinoxaden are compounded. The two have different mechanisms of action and their combination will not produce cross-resistance. Experimental verification shows that the combination of the two has a significant effect on the control of Inula fragrans, can overcome drug resistance and improve the control effect.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] One aspect of the present application provides a herbicidal composition for controlling Inula japonica, wherein the active ingredients of the herbicidal composition are cyproconazole and pinoxaden, and the weight ratio of cyproconazole to pinoxaden is (17-45):(3-31).

[0008] Another aspect of the present application provides a herbicide for controlling Inula japonica, wherein the herbicide comprises the herbicidal composition described above.

[0009] Another aspect of the present application provides use of the herbicidal composition or the herbicide described above in controlling Inula japonica.

[0010] Beneficial effects of this application:

[0011] In the present application, by compounding cyproconazole and pinoxasol to form a mixed agent, the two have a synergistic effect in controlling Inula fragrans. The herbicidal composition provided in the present application shows a significant synergistic effect on controlling Inula fragrans, especially at a specific ratio.

[0012] The development of the herbicidal composition and herbicide in the present application fills the current gap in the lack of pesticides for the prevention and control of Inula japonica, and because the action mechanisms of cyproconazole and pinoxaden are different, the mixing will not produce cross-resistance, which can improve the prevention effect while overcoming the development of drug resistance, and has important practical significance for the prevention and control of Inula japonica. DETAILED DESCRIPTION

[0013] The following will clearly and completely describe the implementation methods of the present application. The technical solutions in the implementation methods described below are exemplary and are only possible technical implementations of the present application, not all possible implementations. Those skilled in the art can fully combine the implementation methods of the present application to obtain other implementation methods without creative work, and these implementation methods are also within the scope of protection of the present application.

[0014] The inventor of the present application has been deeply engaged in the research field of pesticides for many years. After a large number of preliminary experiments, he has studied and determined that cyproconazole and pinoxasol can be mixed to form a mixed agent. The mixed agent has a significant synergistic effect in the prevention and control of Inula japonica, which is of great practical significance for the prevention and control of Inula japonica.

[0015] Cyclohexane, commonly known as cinmethylin in English, has the following structural formula:

[0016]

[0017] Cyclohexanil is a benzyl ether herbicide with a unique chemical structure and novel mechanism of action, mainly used to control resistant grass weeds. Its mechanism of action is as follows: Cyclohexanil is a selective inhibitor of acyl carrier protein (ACP) fatty acid thioesterase (FAT), which inhibits fatty acid biosynthesis, destroys cell membranes, and causes weed death; it is mainly absorbed by the buds and roots of weeds in the seedling stage, and is transmitted to the growth points of roots and buds through the xylem, hindering the mitosis of meristematic cells and causing plant death. At present, cyclohexanil is mainly used as a pre-emergence herbicide in winter cereal fields to control many grass weeds, including difficult-to-control weeds such as Alopecurus macrostachya and Ryegrass; it can also be used to control important weeds in rice fields, such as Echinochloa, Duck tongue grass, Cyperus diversiformis, etc. However, there are no reports of cyclohexanil being used to control Inula japonica.

[0018] Pinoxaden belongs to the new phenylpyrazoline herbicide, and its structural formula is as follows:

[0019]

[0020] Pinoxaden is an inhibitor of acetyl-CoA carboxylase (ACC). Its mechanism of action is to block fatty acid synthesis, stop cell growth and division, and destroy the lipid structure of cell membrane, thus leading to the death of weeds. It has systemic conductivity. At present, it is mainly used to control annual grass weeds in barley fields. It has a good control effect on annual grass weeds in barley fields such as wild oats, foxtail grass, and barnyard grass. There are currently no reports of pinoxaden being used to control Inula japonica.

[0021] The first aspect of the present application discloses a herbicidal composition for controlling Inula, wherein the active ingredients of the herbicidal composition are cyproconazole and pinoxaden, and the weight ratio of cyproconazole and pinoxaden is (17-45): (3-31). Within this ratio range, cyproconazole and pinoxaden show significant synergistic effects in controlling Inula. Preferably, the weight ratio of cyproconazole and pinoxaden is (17-38): (10-31). In some specific examples, the weight ratio of cyproconazole and pinoxaden is 45:3, or 38:10, or 31:17, or 10:10, or 17:31; more preferably, the weight ratio of cyproconazole and pinoxaden is 31::17. Under this ratio, the synergistic effect of the two on the control of Inula is the most significant, and the herbicidal composition has the best control effect on Inula.

[0022] The second aspect of the present application discloses a herbicide for controlling Inula japonica, wherein the herbicide comprises the herbicide composition described in the first aspect of the present application.

[0023] In the present application, the herbicide can be any agriculturally acceptable pesticide formulation, and specific examples include but are not limited to one of aqueous emulsions, microemulsions, wettable powders, suspensions, dispersible oil suspensions, water-dispersible granules, and soluble granules.

[0024] In some examples, the herbicide is in the form of a suspension. In view of the difficulties in the prevention and control of Inula, including its perennial root nature, developed root system and strong regeneration ability of underground stems, natural resistance to common herbicides, and rapid germination and competition for resources with crops, it is a significant technical advantage to prepare the herbicidal composition in this application into a suspension as a control formulation. Specifically, as a stable multiphase dispersion system, the suspension can evenly disperse the active ingredients in the aqueous phase to form particles with a small particle size and uniform distribution, thereby improving the coverage, adhesion and permeability of the agent. This formulation is particularly suitable for the prevention and control of Inula, because it can effectively cover the above-ground parts and underground stems of Inula through foliar spraying or soil treatment, enhance the deposition and absorption of the agent at the target site, and overcome the problems of strong stress resistance and outstanding regeneration ability of Inula. Specifically, cyproconazole (as a cyclohexanedione herbicide, it inhibits the activity of acetyl-CoA carboxylase and blocks fatty acid synthesis, thereby interfering with the cell membrane formation and growth of Inula japonica; while pinoxaden also acts on ACCase, but its chemical structure is unique and can effectively prevent and control weeds that are resistant to multiple herbicides.) The two agents are made into suspensions, which can not only give full play to their mechanism of action, but also ensure the uniform distribution of the agents on the leaves and stems of Inula japonica through the high dispersibility and stability of the suspension, enhance the permeability and systemic conductivity of the agents, thereby significantly improving the prevention effect on the aboveground and underground parts of Inula japonica. In addition, the suspension has good environmental compatibility and ease of application, can reduce the loss and drift of the agent, reduce the impact on non-target organisms, and increase the duration of the agent. Therefore, the use of suspensions as carriers of cyproconazole and pinoxaden can not only overcome the technical difficulties in the prevention and control of Inula japonica, but also significantly improve the comprehensive prevention effect of the agents, which has significant advantages.

[0025] In the present application, in the herbicide, the weight percentage of the herbicidal composition is 20% to 48%, for example, it can be any weight percentage of 20%, 25%, 30%, 35%, 40%, 45%, 48%, and can be configured and selected according to needs.

[0026] It is understandable that the herbicide also includes at least one adjuvant that is arbitrarily acceptable in pesticides. In the herbicide, the weight percentage of the adjuvant can be optimized and configured according to the specific dosage form and the composition of each component to maximize the prevention effect of the active ingredient. Those skilled in the art have such ability, so there is no special limitation. In some examples, the weight percentage of the adjuvant is 5% to 90%.

[0027] There is no special restriction on the specific types of the auxiliary materials, which are some necessary ingredients for preparing the corresponding pesticide formulations, and can also be carriers, functional ingredients that improve the dispersibility and uniformity of the active ingredients, or functional ingredients that assist the active ingredients to better exert their efficacy. Specific examples include but are not limited to at least one of solvents, emulsifiers, dispersants, wetting agents, antifreeze agents, thickeners, defoamers, disintegrants, binders, carriers, and pH regulators. These auxiliary agents can all be common types in the art. For example, for the solvent, it can be at least one of methanol, ethanol, butanol, isobutanol, ethylene glycol, propylene glycol, glycerol, polyethylene glycol, 1-dodecanol, 1-tetradecanol, 1-octadecanol, 1-nonadecanol, 1-eicosanol, toluene, xylene, acetone, cyclohexanone, N-long-chain alkyl pyrrolidone, ethyl acetate, dimethylformamide, and dimethyl sulfoxide, but it is not limited thereto. As for the emulsifier, it can be at least one of sodium dodecyl sulfate, alkyl polyethylene glycol ether, alkylphenyl polyethylene glycol ether, polyoxyethylene sorbitan ester, polyoxyethylene fatty acid ester, alkylphenol polyoxyethylene ether phosphate, ethoxylated alkylbenzene ether, ethoxylated alkyl ether, polyoxyethylene polyoxypropylene block copolymer, phenethylphenol polyoxyethylene polyoxypropylene ether, alkylbenzene sulfonate, lignin sulfonate, tristyrylphenol polyoxyethylene ether phosphate, styrenephenol polyoxyethylene ether, alkylphenol polyoxyethylene ether formaldehyde condensate, castor oil, ethylene oxide adduct, ethylene oxide adduct derivative, sucrose fatty acid ester, Tween, and monodecanoate, but is not limited thereto. For the dispersant, it can be at least one of lignin sulfonate, sodium p-hydroxyphenyl lignin sulfonate, fatty alcohol polyoxyethylene ether phosphate, fatty amide-N-methyl taurate sodium salt, N-methyl taurate sodium salt, alkylphenol polyoxyethylene ether sulfate, sulfite pulp waste liquid, fatty acid ester sulfate, polyoxyethylene polyoxypropylene block copolymer, alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, polyoxyethylene glyceryl monofatty acid ester, hydroxymethyl cellulose, fatty alcohol sulfate, alkylnaphthalene formaldehyde condensate, polyvinyl alcohol, sulfite pulp waste liquid, acrylic acid homopolymer sodium salt, polyvinyl carboxylic acid sodium salt, sodium naphthalene sulfonate formaldehyde condensate, dioctyl sodium sulfosuccinate, but not limited thereto. For the wetting agent, it can be at least one of dodecylbenzene sulfonate, agricultural milk 2000 series, SOPA230, SOPA270, SOPA235, tea dross powder, saponin powder, pull open powder, trisiloxane polyoxyethylene ether, higher fatty acid glyceride, and petroleum sodium sulfonate, but not limited thereto. The antifreeze agent may be at least one of ethylene glycol, propylene glycol, glycerol, and sorbitol, but is not limited thereto. The thickener may be at least one of polyacrylate, xanthan gum, magnesium aluminum silicate, sodium carboxymethyl cellulose, natural polysaccharide, xanthan gum, and gelatin, but is not limited thereto. The defoamer may be at least one of silicone oil, methanol, ethanol, epoxy soybean oil, and silicone, but is not limited thereto.For disintegrants, it can be at least one of urea, magnesium chloride, aluminum chloride, sodium chloride, ammonium sulfate, and bentonite, but it is not limited thereto. For binders, it can be at least one of starch, polyvinyl acetate, polyvinyl alcohol, polyethylene glycol, sodium silicate, gelatin, soybean lecithin, cyclodextrin, gum arabic, carboxycellulose, and polyvinyl pyrrolidone, but it is not limited thereto. For carriers, it can be at least one of kaolin, diatomaceous earth, activated white clay, white carbon black, clay, light calcium carbonate, talcum powder, and montmorillonite, but it is not limited thereto. For pH regulators, it can be at least one of sodium hydroxide, potassium hydroxide, hydrochloric acid, acetic acid, phosphoric acid, and citric acid, but it is not limited thereto. For stabilizers, it can be at least one of isopropyl acid phosphate, BHT, pyrogallol, cresyl glycidyl ether, polyethylene glycol diglycidyl ether, epichlorohydrin, sodium sorbate, aminobenzoic acid, epoxidized soybean oil, and polyethylene glycol, but it is not limited thereto. The penetration enhancer may be laurocapram and / or JFC (fatty alcohol polyoxyethylene ether), but is not limited thereto.

[0028] There are no special restrictions on the auxiliary materials and the specific proportions of the auxiliary materials, and those skilled in the art can make corresponding choices based on actual needs. Taking the suspension as an example, in some examples, the suspension, calculated by weight percentage, includes 0.5% to 35% wetting agent, 0.5% to 35% dispersant, 0.1% to 8% thickener, 0.1% to 10% stabilizer, 0% to 10% penetration enhancer, 0.4% to 10% defoamer, 0.1% to 12% antifreeze, 0.1% to 10% pH adjuster, and 1% to 80% solvent. In some specific examples, the suspension agent, calculated by weight percentage, includes 1% to 40% of cyproconazole, 1% to 40% of pinoxaden, 1% to 25% of sodium lignin sulfonate, 1% to 25% of tristyrylphenol polyoxyethylene ether phosphate, 1% to 5% of xanthan gum, 0.1% to 3.0% of epoxy soybean oil, 0.5% to 75% of silicone oil, 1% to 7% of propylene glycol, 0.1% to 2% of ethyl acetate, and water makes up the balance to 100%. Specifically, the suspension agent of the present application is mutually synergistically adsorbed on the surface of the original drug by adding a wetting agent and a dispersant, and the suspension rate of the original drug is greater than 90% through electrostatic action and steric hindrance. Moreover, after the suspension agent is placed at 54°C for 14 days, the suspension rate of the suspension agent is still greater than 95%, and there is no paste phenomenon; since the suspension agent uses water as a dispersion medium, ethylene glycol, propylene glycol, etc. need to be added to improve the stability of the product at low temperatures. However, due to the influence of dispersants and wetting agents in the suspension system, the suspension generates a large amount of foam during use, which affects its use. The applicant has found that when the antifreeze agent is propylene glycol, adding xanthan gum and silicone oil can achieve good low-temperature dispersibility, hot storage stability, and cold storage stability of the suspension, while the foaming is less than 20mL after 1 minute.

[0029] In the present application, the preparation of the herbicide can adopt methods well known in the art without special requirements. In some examples, taking the suspension as an example, the components are mixed evenly and ball-milled in a ball mill for 2-5 hours to form a coarse dispersion, the pH value is adjusted to 5-7, and then wet ultrafine grinding is performed to make its average particle size meet the national standards to obtain the suspension.

[0030] The third aspect of the present application discloses the use of the above-mentioned herbicidal composition or herbicide in the prevention and control of Inula. The above-mentioned herbicidal composition or herbicide is used for the prevention and control of Inula, and the results of the test show that the prevention and control effect is significant, and it will not affect the growth of normal crops, and the safety is guaranteed.

[0031] The following are specific embodiments of the present application. It should be noted that the following specific embodiments are only for illustrative purposes and do not limit the scope of the present application in any way.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0033] In addition, unless otherwise specified, methods without specific conditions or steps are conventional methods, and the reagents and materials used are all commercially available.

[0034] Indoor toxicity test

[0035] According to the requirements of "Pesticide Indoor Bioassay Test Guidelines Herbicides Part 4: Activity Determination Test Stem and Leaf Spray Method" (NY / T1155.4-2006) and "Pesticide Indoor Bioassay Test Guidelines Herbicides Part 7: Determination of Combined Action of Mixtures" (NY / T 1155.7-2006), the test soil was quantitatively filled to 3 / 4 of the pot, and then watered from the top of the pot to make the soil completely wet to saturation. The pre-treated test weed seeds were evenly and quantitatively sown on the soil surface (by converting the germination rate, the density of the control weeds was guaranteed to be 120 to 150 plants per square meter), covered with 0.5 cm of soil according to the seed size, and moved to the greenhouse for routine cultivation after sowing. After germination, the seedlings were thinned and fixed at a density of 120 plants / m 2 , the weeds were sprayed on the stems and leaves when they were in the 3-4 leaf stage, and the toxicity of cyproconazole (synthetic test sample of Anhui Fengle Agrochemical Co., Ltd.) and pinoxaden (PD20182534, Guangan Lier Chemical Co., Ltd.) on Inula japonica was measured to calculate the co-toxicity coefficient to determine whether there was synergistic effect.

[0036] The co-toxicity coefficient (CTC) method proposed by Sun & Johnson (1960) was used to evaluate the combined effect. Among them, CTC < 80 indicates antagonistic effect, 80 < CTC < 120 indicates additive effect, and CTC > 120 indicates synergistic effect.

[0037] The test results are shown in Table 1.

[0038] Table 1 Determination results of the combined effect of different ratios of cinmethylin and pinoxaden

[0039]

[0040]

[0041] It can be seen from Table 1 that the co-toxicity coefficients of the mixtures of cinmethylin and pinoxaden at the ratios of 45∶3, 38∶10, 31∶17, 10∶10 and 17∶31 against Inula japonica Thunb. were all significantly greater than 120, indicating a significant synergistic effect. Among them, the synergistic effect of treatment E (31:17) was the most significant.

[0042] Examples of pharmaceutical preparation

[0043] Example 1:

[0044] In this example, a suspension concentrate is disclosed. By weight percentage, the composition of the suspension concentrate is as follows:

[0045] Cinmethylin 22.5%, pinoxaden 1.5%, sodium lignosulfonate 4.8%, triphenylvinylphenol polyoxyethylene ether phosphate 6.6%, xanthan gum 4.2%, epoxidized soybean oil 3.0%, silicone oil 1.9%, propylene glycol 5.6%, ethyl acetate 4.0%, and water is added to make up the balance to 100%.

[0046] The preparation method of the suspension concentrate is as follows:

[0047] Mix the components evenly and grind them in a ball mill for 5 hours to form a coarse dispersion. Adjust the pH value to 7, and then control the particle size D90 ≤ 5 μm by wet ultrafine grinding to obtain the suspension concentrate.

[0048] Example 2:

[0049] In this example, a suspension concentrate is disclosed. By weight percentage, the composition of the suspension concentrate is as follows:

[0050] Cinmethylin 19%, pinoxaden 5%, sodium lignosulfonate 5.8%, triphenylvinylphenol polyoxyethylene ether phosphate 5.7%, xanthan gum 3.8%, epoxidized soybean oil 2.5%, silicone oil 1.8%, propylene glycol 3.6%, ethyl acetate 4.1%, and water is added to make up the balance to 100%.

[0051] The preparation method of the suspension is as in Example 1.

[0052] Embodiment 3:

[0053] This embodiment discloses a suspending agent, which has the following composition in terms of weight percentage:

[0054] Cyclohexane 15.5%, pinoxasol 8.5%, sodium lignin sulfonate 3.5%, tristyrylphenol polyoxyethylene ether phosphate 4.2%, xanthan gum 3.1%, epoxidized soybean oil 1%, silicone oil 1.52%, propylene glycol 3.1%, ethyl acetate 3.2%, and water to make up the balance to 100%.

[0055] The preparation method of the suspension is as in Example 1.

[0056] Embodiment 4:

[0057] This embodiment discloses a suspending agent, which has the following composition in terms of weight percentage:

[0058] Cyproconazole 10%, pinoxasol 10%, sodium lignin sulfonate 7.8%, tristyrylphenol polyoxyethylene ether phosphate 6.6%, xanthan gum 3.9%, epoxidized soybean oil 1.6%, silicone oil 4.1%, propylene glycol 4.9%, ethyl acetate 6.0%, and water to make up the balance to 100%.

[0059] The preparation method of the suspension is as in Example 1.

[0060] Embodiment 5:

[0061] This embodiment discloses a suspending agent, which has the following composition in terms of weight percentage:

[0062] Cyclohexane 8.5%, pinoxasol 15.5%, sodium lignin sulfonate 8.1%, tristyrylphenol polyoxyethylene ether phosphate 5.9%, xanthan gum 3.2%, epoxidized soybean oil 3.0%, silicone oil 3.4%, propylene glycol 5.8%, ethyl acetate 5.6%, and water to make up the balance to 100%.

[0063] The preparation method of the suspension is as in Example 1.

[0064] Comparative Example 1:

[0065] This comparative example discloses a suspending agent, which has the following composition in terms of weight percentage:

[0066] Cyclohexane 24%, sodium lignin sulfonate 3.5%, tristyrylphenol polyoxyethylene ether phosphate 4.2%, xanthan gum 3.1%, epoxidized soybean oil 1%, silicone oil 1.52%, propylene glycol 3.1%, ethyl acetate 3.2%, and water to make up the balance to 100%.

[0067] The preparation method of the suspension is as in Example 1.

[0068] Comparative Example 2:

[0069] This comparative example discloses a suspending agent, which has the following composition in terms of weight percentage:

[0070] 24% of pinoxaden, 3.5% of sodium lignin sulfonate, 4.2% of tristyrylphenol polyoxyethylene ether phosphate, 3.1% of xanthan gum, 1% of epoxidized soybean oil, 1.52% of silicone oil, 3.1% of propylene glycol, 3.2% of ethyl acetate, and make up the balance to 100% with water.

[0071] The preparation method of the suspension is as in Example 1.

[0072] Comparative Example 3:

[0073] 5% penoxsulam oil suspension (registration certificate PD20182211, produced by Anhui Fengle Agrochemical Co., Ltd.) was used as a control for conventional control agents.

[0074] Physical and chemical properties determination

[0075] According to the NY / T1860-2016 test guide for determination of the physicochemical properties of pesticides, the suspension rate, hot storage stability (54°C), cold storage stability (5°C), and persistent foaming of the suspension prepared in Examples 1-5 were measured to verify the stability of the formulation. The results are shown in Table 2.

[0076] Table 2 Physical and chemical properties test results

[0077]

[0078] It can be seen from Table 2 that the suspensions of Examples 1-5 are qualified in terms of suspension rate, hot storage and cold storage stability and pourability, and the sustained foaming property is ≤ 20 ml. The physical and chemical properties are excellent, and the stability and storage properties can be guaranteed.

[0079] Field efficacy test

[0080] 1. Test location: Tao Village, Shiqiao Town, Dangtu County, Anhui Province.

[0081] 2. Selection of crops and cultivars: Rice (Hui Liang You 2000).

[0082] 3. Selection of test weeds: Inula japonica.

[0083] 4. Cultivation conditions: The experimental field has long-term rice-wheat (oil) rotation. The weeds in the cultivated land grow evenly, and water conservancy facilities such as ditches, culverts, and water pumps are complete. Direct seeding was carried out on June 5, 2022, with a sowing rate of 2 kg / mu and normal management according to local habits.

[0084] 5. Test agents: The suspension concentrates in Examples 1-5 and Comparative Examples 1-3 were all prepared by Anhui Fengle Agrochemical Co., Ltd.; 5% penoxsulam oil suspension (registration certificate PD20182211, produced by Anhui Fengle Agrochemical Co., Ltd.) was used as a conventional control agent control.

[0085] 6. Cell area and repetition: (1) Cell area: 20m 2 ; (2) Number of repetitions: 4 times.

[0086] 7. Application method: Soil spraying of the test agent. First, measure the dosage of each treatment and the amount of water used. The same agent is applied one by one from low-dose treatment to high-dose treatment. The sprayer is washed with clean water (3 times) before application between different agent treatments; the blank control area is sprayed with the same amount of clean water. German SOLO, 425LC manual backpack sprayer, flow rate 1.1L / min, working pressure 1.5bar.

[0087] 8. Time and frequency of application: Apply the pesticide on June 6, 2022, one day after rice sowing, for a total of one application.

[0088] 9. Survey method and time: The plant protection effect survey was conducted on the 45th day after the application of the pesticide. Five points were randomly selected from each plot, with each point of 0.25 (0.5 × 0.5) m 2 , investigate and record the number of various weeds within the point.

[0089]

[0090] The dosage of each agent and its control effect are shown in Table 3.

[0091] Table 3 Field efficacy test results

[0092]

[0093] It can be seen from the results of the field efficacy test in Table 3 that the usage amount of the cyproconazole-pizocaproic acid suspension in each embodiment is 20-40 ml / mu, and the control effect is more than 70%, which is significantly better than the control effect of cyproconazole and pinoxaden single-dose control on Inula japonica. Among them, the control effect of Example 3 is the best, and the control effect of 40 ml / mu can reach 93.1%. In terms of yield, the rice yield of each embodiment is significantly improved compared with the comparative example and the blank control, among which, the yield-increasing effect of Example 3 is the best. In terms of safety, each embodiment has no effect on the growth of rice, and safety is guaranteed.

[0094] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A herbicidal composition for controlling Inula japonica, characterized in that: The active ingredients of the herbicidal composition are cyproconazole and pinoxaden, and the weight ratio of cyproconazole to pinoxaden is (17-45):(3-31).

2. The herbicidal composition for controlling Inula japonica according to claim 1, characterized in that: The weight ratio of cyproconazole to pinoxaden is (17-38):(10-31).

3. The herbicidal composition for controlling Inula japonica according to claim 1, characterized in that: The weight ratio of cyproconazole to pinoxaden is 45:3, or 38:10, or 31:17, or 10:10, or 17:

31.

4. The herbicidal composition for controlling Inula japonica according to claim 1, characterized in that: The weight ratio of cyproconazole to pinoxasol is 31:

17.

5. A herbicide for controlling Inula japonica, characterized in that: The herbicide comprises the herbicidal composition according to any one of claims 1 to 4.

6. The herbicide for controlling Inula japonica according to claim 5, characterized in that: The herbicide is in the form of an aqueous emulsion, a microemulsion, a wettable powder, a suspension, a dispersible oil suspension, a water-dispersible granule, or a soluble granule; Preferably, the herbicide is in the form of a suspension concentrate.

7. The herbicide according to claim 5, characterized in that In the herbicide, the weight percentage of the herbicidal composition is 20% to 48%.

8. The herbicide according to claim 5, characterized in that The herbicide further comprises at least one auxiliary material acceptable in pesticides.

9. The herbicide according to claim 8, characterized in that In the herbicide, the weight percentage of the auxiliary material is 5% to 90%.

10. Use of the herbicidal composition according to any one of claims 1 to 4 or the herbicide according to any one of claims 5 to 9 in controlling Inula japonica.

Images