Weeding composition, herbicide and application

Abstract

The invention discloses a weeding composition, a herbicide and application, the weeding composition contains an effective weeding amount of dichloro clomazone and halauxifen-methyl, and the dichloro clomazone and halauxifen-methyl are compounded with each other to achieve a remarkable synergistic interaction effect on prevention and control of euphorbia helioscopia. The control effect is obviously better than the control effect of dichloroclomazone and halauxifen-methyl on euphorbia helioscopia, the control effect can be obviously improved, and the generation of drug resistance is effectively avoided. The bactericidal composition has the advantages that the control effect on euphorbia helioscopia is improved, the crop growth is not influenced, the safety is extremely high, a novel targeted medicament is provided for the control of euphorbia helioscopia, and the bactericidal composition has important practical significance.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticides, and specifically relates to a herbicidal composition containing clomazone and clofopyralid, a herbicide containing the herbicidal composition, and applications of the herbicidal composition and the herbicide in preventing and controlling varnish. Background Art

[0002] Euphorbia helioscopia L. is a plant of the Euphorbiaceae family. Its scientific name is Euphorbia helioscopia L., and its aliases include five clouds, cat's eye grass, and five phoenix grass. It is an annual or biennial herb with white latex throughout the plant. Its stems are clustered, obliquely ascending at the base, glabrous or only slightly hairy on the branches, purple-red at the base, and light green on the upper part. The leaves of Euphorbia helioscopia are obovate or spoon-shaped, 1-3 cm long and 0.5-1.8 cm wide, with a blunt tip and finely serrated edges. The flowering period of Euphorbia helioscopia is from April to May, and the fruiting period is from June to July. It mainly grows in ravines, roadsides, wilderness, and wetlands.

[0003] As a weed, lacquer has strong vitality and strong adaptability. It can grow rapidly and occupy a large area of ​​land, thus affecting the normal growth and development of crops. The root system of lacquer is well developed, which can compete with crops for nutrients and water in the soil, affecting the growth of crops. In addition, the seeds of lacquer are small and can be spread by wind, irrigation, etc. Once they take root in farmland, they are difficult to eradicate. Lacquer may also affect the photosynthesis of crops by blocking sunlight, thereby affecting the yield and quality of crops. At present, the crops mainly harmed by lacquer are wheat, rapeseed, potatoes, vegetables, etc., and the area harmed has an upward trend.

[0004] At present, the prevention and control of zelacryma-sinensis is mainly agricultural prevention and chemical prevention. Among them, agricultural prevention is mainly through strengthening field management, timely inter-row cultivation and weeding, and weeding the weeds at the edge of the field. Chemical prevention is mainly to use some specific herbicides to spray the stems and leaves when the wheat is 3-5 leaves, such as using 20% ​​silanol emulsifiable concentrate in combination with other chemicals for prevention and control. However, due to the problems of prevention and control targets and resistance, the prevention and control effects are not good.

[0005] At present, there is no registered pesticide specifically for the prevention and control of lacquer in my country. It is very necessary to develop new targeted pesticides for the prevention and control of lacquer. Summary of the invention

[0006] In view of this, the primary purpose of the present invention is to provide a herbicidal composition, which contains two active ingredients, clomazone and clofopyralid, which will not produce cross-resistance when combined with each other, have a significant synergistic effect in controlling tartaric acid, significantly improve the control effect, and effectively avoid the occurrence of drug resistance.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] The first aspect of the present invention provides a herbicidal composition comprising herbicidally effective amounts of clomazone and halofop-butyl.

[0009] Bixlozone, CAS registration number: 81777-95-9, has the following structural formula:

[0010]

[0011] Dichloroisothiazone is an isoxazolinone herbicide, which is a selective pre-emergence treatment agent. It is mainly absorbed by roots and young shoots and is conducted upward to various parts of the plant with transpiration. It inhibits the action of deoxy-D-xylulose phosphate synthase (DOXP), thereby destroying the biosynthesis of plastid isoprenoids, that is, the synthesis of carotenoids. Carotenoids protect chlorophyll in plant cells and contribute to the photosynthesis process of plants. When carotenoids lose their protective function, the leaves of plants will turn white. Susceptible weeds cannot metabolize dichloroisothiazone and eventually die due to inability to photosynthesis, while tolerant crops will metabolize dichloroisothiazone and continue to grow. Therefore, it can be widely used in crops such as fruit trees, vegetables, cotton, rice, sorghum, barley, wheat, rye, corn and rapeseed to control grass weeds and broad-leaved weeds. It has a wide spectrum of weed control, has a contact effect, and is effective against important resistant weeds.

[0012] Florpyrauxifen-benzyl, CAS registration number 1390661-72-9, has the following structural formula:

[0013]

[0014] Cloflupyridin-butyl is a brand-new aromatic pyridine carboxylate herbicide with systemic properties. After application, the drug is absorbed by the leaves and roots of weeds, can be conducted through the xylem and phloem, and accumulated in the meristem of weeds to exert herbicidal activity. It has a broad-spectrum and high-efficiency herbicidal activity, and has a good control effect on Gramineae weeds such as Leptochloa chinensis, Rice, Bald Head, Grass, Cyperus rotundus, Cyperus rotundus, Cyperus rotundus, Cyperus rotundus, Cyperus rotundus, Cyperus rotundus, and Cyperus rotundus, and broad-leaved weeds such as Xanthium sibiricum, Sagittaria, Yujiuhua, Syringa syringae, Mother grass, Erigeron, Li, Ambrosia, Guancai, Water lettuce, Alisma orientalis, and Abutilon. In addition, cloflupyridin-butyl has no cross-resistance, no antagonism, and is environmentally friendly. It is particularly suitable for plants such as water hyacinth. It is highly safe for aquatic organisms. Tests have shown that cloflupyridin-butyl does not have cross-resistance even for hormone herbicides.

[0015] The inventor has been deeply engaged in the field of pesticide compounding technology for many years. Through a large number of experiments, it is found that the combination of clomazone and cloflupyridin-methyl has a significant synergistic effect on the prevention and control of lacquer, and because the two have different mechanisms of action, the combination will not produce cross-resistance, and has obvious synergistic effect on the prevention of lacquer, and is highly safe. In addition, the inventor found that there is no report on the control effect of clomazone and cloflupyridin-methyl on the perennial weed lacquer, so this application is proposed.

[0016] The "herbicidally effective amount" described herein refers to the dosage of the herbicidal component required to achieve the desired herbicidal effect, which can ensure that the weeds are effectively controlled or killed while minimizing the impact on the crop environment. The herbicidally effective amount can be determined by indoor experiments and field tests well known to those skilled in the art.

[0017] In some specific implementation cases of the present invention, the weight ratio of clomazone to clopyralid is (1-9):(7-15).

[0018] Preferably, the weight ratio of clomazone to clopyralid is (1-7):(9-15).

[0019] Preferably, the weight ratio of clomazone to clopyralid is 9:7, 7:9, 5:11, 3:13 or 1:15.

[0020] More preferably, the weight ratio of clomazone to clopyralid is 5:11.

[0021] The second aspect of the present invention provides a herbicide comprising the herbicidal composition described above.

[0022] In a further embodiment, in the herbicide, the weight percentage of the herbicidal composition is 16% to 32%, for example, it can be any weight percentage among 16%, 17%, 18%, 20%, 24%, 26%, 30%, and 32%.

[0023] It is to be understood that the herbicide described in the present invention, in addition to the herbicidal composition described above, also contains any acceptable carrier and / or additive in pesticides.

[0024] The "carrier" described in the present invention generally refers to organic or inorganic, natural or synthetic substances conventionally used in the art. They facilitate the application of herbicidal active ingredients. The carrier is generally inert and must be acceptable in pesticides, especially accepted by the crops or plants being treated. In some specific implementation cases of the present invention, the carrier can be solid, such as kaolin, diatomaceous earth, activated white clay, white carbon black, clay, light calcium carbonate, talc, montmorillonite, etc.; the carrier can also be liquid, such as water, alcohols, ketones, petroleum fractions, aromatic hydrocarbons or wax hydrocarbons, chlorinated hydrocarbons, liquefied gas, etc.

[0025] The "additives" mentioned in the present invention generally refer to adjuvants conventionally used in pesticide formulations in the art, for example, at least one of an emulsifier, a dispersant, a wetting agent, an antifreeze agent, a thickener, a defoaming agent, a disintegrant, a binder, a pH adjuster, a stabilizer, a penetration enhancer, etc.

[0026] It is understandable that the additives described in the present invention are not particularly limited, and any additives conventionally used in pesticide preparations in the art can be used in the present invention, and those skilled in the art can make corresponding selections according to different pesticide preparation forms.

[0027] Specifically, the emulsifier can be, for example, sodium lauryl 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, styrenephenol polyoxyethylene ether, alkylphenol polyoxyethylene ether formaldehyde condensate, castor oil, ethylene oxide adduct, ethylene oxide adduct derivative, sucrose fatty acid ester, Tween, monodecanoate at least one, but is not limited thereto.

[0028] The dispersant may be, for example, 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 is not limited thereto.

[0029] The wetting agent may be, for example, at least one of dodecylbenzene sulfonate, Nongru 2000 series, SOPA230, SOPA270, SOPA235, tea dross powder, saponin powder, pull-open powder, trisiloxane polyoxyethylene ether, higher fatty acid glyceride, and sodium petroleum sulfonate, but is not limited thereto.

[0030] The antifreeze agent may be, for example, at least one of ethylene glycol, propylene glycol, glycerol, and sorbitol, but is not limited thereto.

[0031] The thickener may be, for example, at least one of polyacrylate, xanthan gum, magnesium aluminum silicate, sodium carboxymethyl cellulose, natural polysaccharides, xanthan gum, and gelatin, but is not limited thereto.

[0032] The defoaming agent may be, for example, at least one of silicone oil, methanol, ethanol, epoxy soybean oil, and silicone, but is not limited thereto.

[0033] The disintegrant may be, for example, at least one of urea, magnesium chloride, aluminum chloride, sodium chloride, ammonium sulfate, and bentonite, but is not limited thereto.

[0034] The binder may be, for example, at least one of starch, polyvinyl acetate, polyvinyl alcohol, polyethylene glycol, sodium silicate, gelatin, soybean lecithin, cyclodextrin, gum arabic, carboxyl cellulose, and polyvinyl pyrrolidone, but is not limited thereto.

[0035] The pH adjuster may be, for example, at least one of sodium hydroxide, potassium hydroxide, hydrochloric acid, acetic acid, phosphoric acid, and citric acid, but is not limited thereto.

[0036] The stabilizer may be, for example, 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 is not limited thereto.

[0037] The penetration enhancer may be, for example, laurocapram and / or JFC, but is not limited thereto.

[0038] In a further embodiment, in the present invention, the herbicide formulation can be prepared in any pesticide formulation in the art, such as an aqueous emulsion, a microemulsion, a wettable powder, a suspension, a dispersible oil suspension, a water-dispersible granule or a soluble granule.

[0039] Preferably, taking into account factors such as efficacy, cost, and stability, in some specific embodiments of the present invention, the herbicide is in the form of a suspension.

[0040] In the specific composition of the suspension, in addition to the active ingredients of the present invention, other adjuvants, carriers, etc. can be selected according to the needs of the art without special limitation. In some specific implementation cases of the present invention, the carrier and / or additives in the suspension include, by weight percentage, 0.5-30% wetting agent, 0.5-30% dispersant, 0.1-5% thickener, 0.1-5% stabilizer, 0-9% penetration enhancer, 0.5-8% defoamer, 0.1-10% antifreeze agent, 0.1-8% pH adjuster, and the solvent is supplemented to 100%.

[0041] The preparation method of the suspension can adopt the preparation method commonly used in the art without special restrictions; in the present application, the preparation method of the suspension comprises the following steps: uniformly mixing the components and grinding them in a ball mill for 2-5 hours to form a coarse dispersion, adjusting the pH value to 5-7, and then ultrafine grinding by wet method to make its average particle size meet the national standard, so as to obtain the suspension.

[0042] Further, in some preferred embodiments, the suspending agent, calculated by weight percentage, includes 1-30% of diclofenac, 1-30% of clofopyralid, 1-20% of sodium lignin sulfonate, 1-20% of tristyrylphenol polyether phosphate, 1-4% of xanthan gum, 0.1-2.5% of epoxidized soybean oil, 0.5-5.5% of silicone oil, 2-5% of propylene glycol, 0.5-1% of ethyl acetate, and water makes up the balance to 100%.

[0043] The suspension is 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. After the suspension is placed at 54°C for 14 days, the suspension rate of the suspension is still greater than 90%, and there is no creaming phenomenon; since the suspension is water-based 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 the dispersant and the wetting agent in the suspension system, the suspension generates a large amount of foam during use, which affects the use. The applicant found that when the antifreeze is propylene glycol, the addition of 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.

[0044] The third aspect of the present invention provides the use of the above-mentioned herbicidal composition or the above-mentioned herbicide in the prevention and control of lacquer. In specific application, the application method is different according to the dosage form of the herbicidal composition or the herbicide, and different application methods are used according to different dosage forms, such as spraying, etc., which will not be described one by one here. Among them, the application amount of the active ingredient is: 37.5-75g ai / hectare of diclofenac and 82.5-165g ai / hectare of clopyralid.

[0045] Beneficial effects of the present invention:

[0046] The two active ingredients, clomazone and clofopyralid, in the herbicidal composition of the present invention have a significant synergistic effect in controlling lacquer, and the control effect is significantly better than the control effect of clomazone and clofopyralid alone on lacquer.

[0047] The herbicidal composition or herbicide in the present invention has no effect on crop growth while improving the control effect on lacquer, and has extremely high safety. The herbicidal composition or herbicide in the present invention provides a new targeted agent for the control of lacquer, which has important practical significance. DETAILED DESCRIPTION

[0048] Embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. In addition, unless otherwise specified, methods that do not specifically record conditions or steps are conventional methods, and the reagents and materials used can be obtained from commercial sources.

[0050] Co-toxicity coefficient determination

[0051] In order to better understand the combined action and effect of the herbicidal composition of the present invention on lacquer, the following method was used for detection, as follows:

[0052] The co-toxicity coefficient (CTC) method proposed by Sun & Johnson (1960) is used to evaluate the synergistic effect of the herbicidal composition provided by the present invention: the natural logarithm of the concentration of the agent (X) and the growth inhibition percentage or fresh weight inhibition percentage (Y) of the agent on the target lacquer are used to obtain a regression equation, and the EC50 value or EC90 value of the agent on the lacquer is calculated, and then the co-toxicity coefficient is obtained. The co-toxicity coefficient is used to evaluate the combined effect of the compound agent on the lacquer, and a co-toxicity coefficient of >120 indicates a synergistic effect, a co-toxicity coefficient between 80 and 120 indicates an additive effect, and a co-toxicity coefficient of <80 indicates an antagonistic effect. The co-toxicity coefficient is measured using indoor potted plants.

[0053] Co-toxicity coefficient = actual toxicity index of the mixture / theoretical toxicity index × 100;

[0054] Measured toxicity index (ATI) = (ED50 of standard agent / ED50 of test agent) × 100;

[0055] Theoretical toxicity index (TTI) = toxicity index of agent A × percentage of A in the mixture + toxicity index of agent B × percentage of B in the mixture.

[0056] The results are shown in Table 1.

[0057] Table 1 Test results of the combined action of diclofenac and clofopyralid at different ratios

[0058]

[0059]

[0060] It can be seen from the test results in Table 1 that the co-toxicity coefficients of clomazone and clofopyralid in the mass ratios of 9:7, 7:9, 5:11, 3:13 and 1:15 are significantly greater than 120, indicating that the synergistic effect of clomazone and clofopyralid on lacquer is significant, among which the synergistic effect of treatment E is the most significant.

[0061] Herbicide Preparation Example

[0062] Example 1 24% Clomazone-Lyclopyralid Suspension Concentrate

[0063] The suspending agent in this embodiment is prepared from the following components, calculated by weight percentage: 13.5% of clomazone, 10.5% of clopyralid, 5% of sodium lignin sulfonate, 7% of tristyrylphenol polyether phosphate, 4.5% of xanthan gum, 2.5% of epoxidized soybean oil, 1.8% of silicone oil, 4.6% of propylene glycol, 3.5% of ethyl acetate, and water makes up the balance to 100%.

[0064] The suspension is specifically prepared by mixing the components uniformly and grinding them in a ball mill for 4 hours to form a coarse dispersion, adjusting the pH value to 7, and then controlling the particle size D90≤5μm by wet ultrafine grinding to obtain the suspension.

[0065] In particular, tristyrylphenol polyether phosphate was purchased from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd.

[0066] Example 2 32% Clomazone-clopyralid suspension

[0067] The suspending agent in this embodiment is prepared from the following components, calculated by weight percentage: 14% of clomazone, 18% of clopyralid, 5.5% of sodium lignin sulfonate, 6% of tristyrylphenol polyether phosphate, 4.2% of xanthan gum, 1.5% of epoxidized soybean oil, 2.7% of silicone oil, 4.4% of propylene glycol, 4.2% of ethyl acetate, and the balance is made up to 100% with water.

[0068] The preparation method of the suspension is the same as that of Example 1.

[0069] Example 3 16% Clomazone-clopyralid suspension

[0070] The suspending agent in this embodiment is prepared from the following components, calculated by weight percentage: 5% of diclofenac, 11% of clopyralid, 4.6% of sodium lignin sulfonate, 4.6% of tristyrylphenol polyether phosphate, 3.6% of xanthan gum, 1% of epoxidized soybean oil, 1.5% of silicone oil, 4% of propylene glycol, 3.8% of ethyl acetate, and the balance is made up to 100% with water.

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

[0072] Example 4 20.8% Clomazone·Lautopilot-butyl suspension

[0073] The suspending agent in this embodiment is prepared from the following components, calculated by weight percentage: 3.9% of diclofenac, 16.9% of clopyralid, 9.8% of sodium lignin sulfonate, 6.1% of tristyrylphenol polyether phosphate, 2.3% of xanthan gum, 1.5% of epoxidized soybean oil, 3% of silicone oil, 5.6% of propylene glycol, 5.7% of ethyl acetate, and water makes up the balance to 100%.

[0074] The preparation method of the suspension is the same as that of Example 1.

[0075] Example 5 16% Clomazone-clopyralid suspension

[0076] The suspending agent in this embodiment is prepared from the following components, calculated by weight percentage: 1% of diclofenac, 15% of clopyralid, 9.8% of sodium lignin sulfonate, 6.1% of tristyrylphenol polyether phosphate, 2.9% of xanthan gum, 2.5% of epoxidized soybean oil, 3.1% of silicone oil, 6.3% of propylene glycol, 6.0% of ethyl acetate, and the balance is made up to 100% with water.

[0077] The preparation method of the suspension is the same as that of Example 1.

[0078] Comparative Example 1

[0079] The suspending agent in this comparative example is prepared from the following components, calculated by weight percentage: 32% of clomazone, 4.6% of sodium lignin sulfonate, 4.6% of tristyrylphenol polyether phosphate, 3.6% of xanthan gum, 1% of epoxidized soybean oil, 1.5% of silicone oil, 4% of propylene glycol, 3.8% of ethyl acetate, and the balance is made up to 100% with water.

[0080] The preparation method of the suspension is the same as that of Example 1.

[0081] Comparative Example 2

[0082] The suspending agent in this comparative example is prepared from the following components, calculated by weight percentage: 40% of clofopyralid, 4.6% of sodium lignin sulfonate, 4.6% of tristyrylphenol polyether phosphate, 3.6% of xanthan gum, 1% of epoxidized soybean oil, 1.5% of silicone oil, 4% of propylene glycol, 3.8% of ethyl acetate, and water making up the balance to 100%.

[0083] The preparation method of the suspension is the same as that of Example 1.

[0084] Comparative Example 3

[0085] 200 clofopyralid emulsifiable concentrate (registration certificate PD20086144, produced by Anhui Fengle Agrochemical Co., Ltd.) was used as a control for conventional control agents.

[0086] The preparation method of the suspension is the same as that of Example 1.

[0087] Physical and chemical properties test

[0088] According to the NY / T1860-2016 test guide for determination of the physicochemical properties of pesticides, the suspension rate, hot storage stability, cold storage stability, and persistent foaming of the suspension concentrates in Examples 1-5 were measured to verify the stability of the formulation. The results are shown in Table 2.

[0089] Table 2 Physical and chemical tests of the suspending agents in Examples 1-5

[0090]

[0091] Field efficacy test

[0092] 1. Experimental location: Xiaba, Gaochun District, Nanjing.

[0093] 2. Choice of crops and cultivars: wheat (Yangfu wheat No. 4).

[0094] 3. Selection of test weeds: Euphorbia helioscopia L.

[0095] 4. Cultivation conditions: medium soil, pH 7.3, organic matter content 2.2g / kg; wheat was sown on November 10, 2020, and the cultivation type was broadcasting; the previous crop was rice.

[0096] 5. Test agent:

[0097] The suspensions in Examples 1-5 and Comparative Examples 1-3 of the present invention are all prepared by Anhui Fengle Agrochemical Co., Ltd. 200 Fluopyr emulsifiable concentrate (registration certificate PD20086144, produced by Anhui Fengle Agrochemical Co., Ltd.) is used as a conventional control agent control.

[0098] 6. Cell area and repetition: Cell area 20m 2 , repeated 4 times.

[0099] 7. Application method: Spray the stems and leaves with a water content of 450kg / hectare; Linong HD400 (produced by Linong Singapore) with a special nozzle for herbicides, a spray pressure of 45Pa, and a spray rate of 610mL / min. No residual liquid is left.

[0100] 8. Time and frequency of application: Apply the pesticide once at the initial stage of emergence of Zeqi seedlings.

[0101] The dosage and control effect of each treatment are shown in Table 3.

[0102] Table 3 Field efficacy test results

[0103]

[0104] The test results in Table 3 show that the dosage of clomazone·halopitol in each embodiment is 50-100 ml / mu, and the control effect is above 70%, which is significantly better than the control effect of clomazone and halopitol single-dose control on ze lacquer. Among them, the control effect of Example 3 is the best, and the control effect of 100 ml / mu can reach 92.5%. In terms of yield, the wheat yield of each embodiment is significantly improved compared with the comparative example and the blank control, and the yield increase effect of Example 3 is the best. In terms of safety, each embodiment has no effect on the growth of wheat, and the safety is guaranteed.

[0105] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0106] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A herbicidal composition, characterized in that Contains herbicidally effective amounts of clomazone and chlorpyrifos.

2. The herbicidal composition according to claim 1, characterized in that The weight ratio of clomazone to clopyralid is (1-9):(7-15).

3. The herbicidal composition according to claim 1, characterized in that The weight ratio of clomazone to clopyralid is (1-7):(9-15).

4. The herbicidal composition according to claim 1, characterized in that The weight ratio of clomazone to clopyralid is 9:7, 7:9, 5:11, 3:13 or 1:

15.

5. The herbicidal composition according to claim 1, characterized in that The weight ratio of clomazone to clopyralid is 5:

11.

6. A herbicide, characterized in that: Contains the herbicidal composition according to any one of claims 1 to 5.

7. The herbicide according to claim 6, characterized in that In the herbicide, the weight percentage of the herbicidal composition is 16% to 32%.

8. The herbicide according to claim 6, characterized in that The herbicide may further contain any pesticide-acceptable carrier and / or additive.

9. The herbicide according to claim 6, 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.

10. Use of the herbicidal composition according to any one of claims 1 to 5 or the herbicide according to any one of claims 6 to 9 in controlling tarnish; Preferably, the application rate of the active ingredient is: 37.5-75 g ai / hectare for clomazone and 82.5-65 g ai / hectare for clopyralid.

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