A herbicidal composition containing fentrazamide

Abstract

The present invention discloses a herbicidal composition containing flufenacet and its application. The composition comprises active ingredient A and active ingredient B, wherein active ingredient A is flufenacet, and active ingredient B is selected from one or more of pyrazosulfuron-ethyl and bispyribac-sodium. The mass ratio of active ingredient A to active ingredient B in the composition is 1:50 - 50:1. The composition can be formulated into agriculturally acceptable dosage forms, preferably emulsifiable concentrates, suspensions, wettable powders, water dispersible granules, and dispersible oil suspensions. The components of the present invention are reasonable, having good herbicidal effects in paddy fields, and its activity and herbicidal effects are not a simple superposition of each component. Compared with existing single preparations, it has the characteristics of remarkable herbicidal effects, low dosage, broad herbicidal spectrum, and good safety for crops.

Description

[0001] This divisional application of the present invention has an application number of 201910748120.2, a filing date of August 14, 2019, and an invention title of "A herbicidal composition containing triaziflam". Technical Field

[0002] The present invention relates to a herbicidal composition, specifically to a herbicidal composition containing triaziflam, and belongs to the technical field of pesticide compounding. Background Art

[0003] Triaziflam (CAS No.: 131475 - 57 - 5) is a novel triazine herbicide developed by Idemitsu Kosan Company of Japan in the late 1990s. It is mainly used for pre - emergence and post - emergence control of gramineous weeds and broad - leaf weeds in paddy fields. Triaziflam can act on multiple sites (inhibiting photosynthesis, microtubule formation, and cellulose formation), and has a brand - new herbicidal mechanism.

[0004] Penoxsulam (CAS No.: 219714 - 96 - 2) is an inhibitor of branched - chain amino acid (leucine, isoleucine, and valine) synthesis (ALS or AHAS). It is mainly absorbed through leaves, followed by roots, and is conducted in the phloem and xylem. It is used for controlling barnyard grass and many aquatic weeds of broad - leaf and Cyperaceae families in paddy fields.

[0005] Pyrazosulfuron - ethyl (CAS No.: 93697 - 74 - 6) is an inhibitor of branched - chain amino acid synthesis (ALS or AHAS). By inhibiting the synthesis of leucine and valine, it inhibits cell division and plant growth. It is a systemic herbicide that is absorbed through the roots and leaves of plants and conducted to the meristem. It is mainly used for controlling annual or perennial broad - leaf weeds, sedges, etc. in direct - seeding or transplanted paddy fields.

[0006] Bispyribac - sodium (CAS No.: 125401 - 92 - 5) is a benzoic acid - type selective herbicide. It inhibits the synthesis of acetyl - lactate (ALS) by root - leaf absorption, thus hindering the biosynthesis of branched - chain amino acids and inhibiting the growth of plant meristems, thereby killing weeds. It is used in direct - seeding paddy fields to control annual broad - leaf weeds.

[0007] Herbicide varieties containing a single active ingredient have varying degrees of deficiencies in weed control. After continuous use, weeds are prone to developing resistance, resulting in problems such as a narrowing of the weed control spectrum and environmental pollution. Rational compounding of herbicides is an effective method to improve the control effect, expand the weed control spectrum, delay weed resistance, reduce environmental pollution, lower the use cost, and reduce herbicide residues. The applicant unexpectedly found that mixing one or more of the triaziflam with penoxsulam, pyrazosulfuron-ethyl, and bispyribac-sodium, which have different mechanisms of action, has a significant synergistic control effect on various broadleaf weeds such as Eclipta prostrata, Monochoria vaginalis, Sagittaria pygmaea, etc., grass weeds such as Echinochloa crusgalli, Leptochloa chinensis, Leersia oryzoides, etc., and Cyperus difformis in the Cyperaceae family. It significantly improves the control effect on broadleaf and grass weeds in paddy fields and expands the weed control spectrum. It also has the advantages of reducing the amount of drug used and lowering the control cost, while improving the safety for crops. And after retrieval, the mixing of triaziflam with one or more of penoxsulam, pyrazosulfuron-ethyl, and bispyribac-sodium has not been reported. Summary of the Invention

[0008] The object of the present invention is to provide a herbicidal composition containing triaziflam with reasonable components, low drug use cost, obvious synergistic effect, good weeding effect, wide weed control spectrum, and safe for crops.

[0009] Another object of the present invention is to provide a preparation dosage form of the herbicidal composition containing triaziflam.

[0010] Another object of the present invention is to provide the application of the above composition in controlling grass and broadleaf weeds in paddy fields.

[0011] The technical solution of the present invention is as follows:

[0012] A herbicidal composition containing triaziflam, the active ingredients comprise active ingredient A and active ingredient B, wherein active ingredient A is triaziflam, and active ingredient B is selected from one or more of penoxsulam, pyrazosulfuron-ethyl, and bispyribac-sodium;

[0013] Further, in the herbicidal composition, the weight ratio of active ingredient A and active ingredient B is 1:50 - 50:1;

[0014] Further, in the herbicidal composition, the weight ratio of active ingredient A and active ingredient B is 1:20 - 20:3;

[0015] Further, in the herbicidal composition, the mass ratio of triaziflam to penoxsulam is 5:1 - 20:1; the mass ratio of triaziflam to pyrazosulfuron-ethyl is 10:3 - 8:1; the mass ratio of triaziflam to bispyribac-sodium is 2:1 - 20:3;

[0016] Furthermore, the preferred mass ratios of fentrazamide to penoxsulam are 10:1, 5:1, 10:3, 15:1, 15:2, 20:1, 20:3; the preferred mass ratios of fentrazamide to pyrazosulfuron-ethyl are 5:1, 4:1, 10:3, 15:2, 6:1, 8:1, 20:3; the preferred mass ratios of fentrazamide to bispyribac-sodium are 10:3, 5:2, 2:1, 5:1, 15:4, 3:1, 20:3, 4:1;

[0017] Furthermore, the preferred mass ratios of fentrazamide to penoxsulam are 10:1, 5:1, 15:1, 15:2; the preferred mass ratios of fentrazamide to pyrazosulfuron-ethyl are 5:1, 4:1, 6:1; the preferred mass ratios of fentrazamide to bispyribac-sodium are 15:4, 3:1, 4:1.

[0018] The total weight of the active ingredients of the herbicidal composition accounts for 10% to 90% of the total weight of the composition, preferably 20% to 60%.

[0019] The present invention provides a herbicidal composition containing active ingredient A and active ingredient B. The above herbicidal composition can be formulated into a pesticide-acceptable preparation dosage form according to the methods well known to those skilled in the art, including solid preparations and liquid preparations;

[0020] Furthermore, the liquid preparations are microcapsule suspensions, dispersible concentrates, emulsifiable concentrates, emulsion granules, oil-in-water emulsions, milk powders, water-in-oil emulsions, microemulsions, dispersible oil suspensions, oil-dispersible powders, suspensions, suspoemulsions, soluble solutions, ultra-low volume liquids;

[0021] Furthermore, the preferred dosage forms of the preparation are emulsifiable concentrates, suspensions, wettable powders, water-dispersible granules, dispersible oil suspensions;

[0022] Furthermore, the auxiliaries that can be used in emulsifiable concentrates are: emulsifiers such as fatty alcohol polyoxyethylene ethers, alkylphenol polyoxyethylene ethers, alkylphenol polyoxyethylene polyoxypropylene ethers, castor oil ethylene oxide adducts and their derivatives, polyoxyethylene polyoxypropylene block copolymers, calcium dodecylbenzenesulfonate; solvents such as mesitylene, methyl oleate, N,N-dimethyldecanamide, dimethyl sulfoxide, propylene carbonate, one or more of them.

[0023] Furthermore, the auxiliaries that can be used in the suspending agent are as follows: dispersants such as one or more of polycarboxylates, lignosulfonates, alkylnaphthalenesulfonates (dispersant NNO), etc.; emulsifiers such as one or more of BY (castor oil polyoxyethylene ether) series emulsifiers (BY-110, BY-125, BY-140), agricultural emulsion 700# (alkylphenol formaldehyde resin polyoxyethylene ether), agricultural emulsion 2201, Span-60# (sorbitan monostearate), Tween-60# (polyoxyethylene sorbitan monostearate), agricultural emulsion 1601# (phenylethylphenol polyoxyethylene polyoxypropylene ether), etc.; wetting agents such as one or more of alkylphenol polyoxyethylene ether formaldehyde condensate sulfates, alkylphenol polyoxyethylene ether phosphates, phenylethylphenol polyoxyethylene ether phosphates, alkyl sulfates, alkyl sulfonates, naphthalenesulfonates, etc.; thickeners such as one or more of silica white, polyvinyl alcohol, bentonite, magnesium aluminum silicate, etc.; antifreezing agents such as one or more of ethylene glycol, propylene glycol, glycerol, urea, inorganic salts such as sodium chloride, etc.; the carrier is deionized water;

[0024] Furthermore, the auxiliaries that can be used in the wettable powder are as follows: dispersants such as one or more of polycarboxylates, lignosulfonates, polyoxyethylene polyoxypropylene block copolymers, alkylnaphthalene formaldehyde condensate sulfonates, alkylphenol polyoxyethylene ether phosphates, fatty alcohol polyoxyethylene ether phosphates, alkylphenol polyoxyethylene ether sulfonates, etc.; wetting agents such as one or more of alkyl sulfates, alkyl sulfonates, alkylnaphthalenesulfonates, etc.; fillers such as one or more of ammonium sulfate, urea, sucrose, glucose, diatomaceous earth, kaolin, silica white, light calcium carbonate, talc powder, attapulgite clay, pottery clay, etc.;

[0025] Furthermore, the auxiliaries that can be used in the water dispersible granules are as follows: dispersants such as one or more of polycarboxylates (TERSPERSE 2700, T36, GY-D06, etc.), lignosulfonates, alkylnaphthalenesulfonates, etc.; wetting agents such as one or more of alkyl sulfates, alkyl sulfonates, naphthalenesulfonates, etc.; disintegrants such as one or more of ammonium sulfate, sodium sulfate, polyvinylpyrrolidone, starch or its derivatives, bentonite, etc.; binders such as one or more of starch, glucose, polyvinyl alcohol, polyethylene glycol, sodium carboxymethyl cellulose, sucrose, etc.; fillers such as one or more of diatomaceous earth, kaolin, silica white, light calcium carbonate, talc powder, attapulgite clay, pottery clay, etc.;

[0026] Furthermore, the auxiliaries that can be used in the oil-dispersible suspension include: one or more of dispersants such as polycarboxylates, lignosulfonates, alkylnaphthalenesulfonates (dispersant NNO), etc.; emulsifiers such as BY (castor oil polyoxyethylene ether) series emulsifiers (BY-110, BY-125, BY-140), agricultural emulsion 700# (alkylphenol formaldehyde resin polyoxyethylene ether), agricultural emulsion 2201, Span-60# (sorbitan monostearate), Tween-60# (polyoxyethylene sorbitan monostearate), agricultural emulsion 1601# (phenylethylphenol polyoxyethylene polyoxypropylene ether), etc.; wetting agents such as alkylphenol polyoxyethylene ether formaldehyde condensate sulfates, alkylphenol polyoxyethylene ether phosphates, phenylethylphenol polyoxyethylene ether phosphates, alkyl sulfates, alkyl sulfonates, naphthalenesulfonates, etc.; thickeners such as silica white, polyvinyl alcohol, bentonite, magnesium aluminum silicate, etc.; antifreezing agents such as ethylene glycol, propylene glycol, glycerol, urea, inorganic salts such as sodium chloride, etc.; dispersing media such as soybean oil, rapeseed oil, wheat oil, methyl oleate, diesel oil, engine oil, mineral oil, etc.

[0027] Furthermore, the composition is an emulsifiable concentrate, and the components and their contents contained in the emulsifiable concentrate are preferably: 0.1 - 100 parts of active ingredient A, 0.1 - 100 parts of active ingredient B, 0.1 - 20 parts of emulsifier, and the solvent makes up the balance.

[0028] Furthermore, the composition is a suspension concentrate, and the components and their contents contained in the suspension concentrate are preferably: 0.1 - 100 parts of active ingredient A, 0.1 - 100 parts of active ingredient B, 1 - 15 parts of dispersant, 0.5 - 20 parts of emulsifier, 1 - 10 parts of wetting agent, 1 - 10 parts of thickener, 0 - 10 parts of antifreezing agent, and deionized water makes up the balance.

[0029] Furthermore, the composition is a wettable powder, and the components and their contents contained in the wettable powder are preferably: 0.1 - 100 parts of active ingredient A, 0.1 - 100 parts of active ingredient B, 1 - 20 parts of dispersant, 1 - 15 parts of wetting agent, and the filler makes up the balance.

[0030] Furthermore, the composition is a water-dispersible granule, and the components and their contents contained in the water-dispersible granule are preferably: 0.1 - 100 parts of active ingredient A, 0.1 - 100 parts of active ingredient B, 1 - 15 parts of dispersant, 1 - 10 parts of wetting agent, 1 - 15 parts of disintegrant, 1 - 10 parts of binder, and the filler makes up the balance.

[0031] Further, the composition is a dispersible oil suspension, and the components and their contents in the dispersible oil suspension are preferably: 0.1 - 100 parts of active ingredient A, 0.1 - 100 parts of active ingredient B, 1 - 15 parts of dispersant, 0.5 - 20 parts of emulsifier, 1 - 10 parts of wetting agent, 1 - 10 parts of thickener, 0 - 10 parts of antifreeze, and the balance of the dispersing medium is made up;

[0032] The present invention also discloses the use of the herbicidal composition as described above for controlling unwanted plants;

[0033] Further, the growth site of the unwanted plants is a paddy field;

[0034] Further, the unwanted plants are gramineous weeds and / or broad - leaf weeds and / or cyperaceae weeds;

[0035] Still further, the gramineous weeds are one or more of Echinochloa crusgalli, Leptochloa chinensis, Leersia oryzoides, the broad - leaf weeds are one or more of Eclipta prostrata, Monochoria vaginalis, Sagittaria pygmaea, and the cyperaceae weeds are one or more of Cyperus difformis, Cyperus rotundus.

[0036] The present invention also discloses a method for controlling unwanted plants, which is to apply the herbicidal composition containing active ingredient A and active ingredient B as described above to the growth site and / or leaves and / or stems of the unwanted plants; preferably, the growth site of the unwanted plants is a paddy field; preferably, the unwanted plants are gramineous weeds and / or broad - leaf weeds and / or cyperaceae weeds; still more preferably, the gramineous weeds are one or more of Echinochloa crusgalli, Leptochloa chinensis, Leersia oryzoides, Cyperus rotundus, the broad - leaf weeds are one or more of Eclipta prostrata, Monochoria vaginalis, Sagittaria pygmaea, and the cyperaceae weeds are one or more of Cyperus difformis, Cyperus rotundus.

[0037] Advantages of the present invention:

[0038] The components of the present invention are reasonable, with good herbicidal effects, low application costs, and its activity and herbicidal effects are not a simple superposition of the activities of each component, but have a significant synergistic effect, which can expand the weed control spectrum, delay resistance, and have good safety for crops, meeting the safety requirements of pesticide formulations. The present invention has good control effects on broad - leaf weeds, gramineous weeds, and cyperaceae weeds such as Echinochloa crusgalli, Leptochloa chinensis, Leersia oryzoides, Eclipta prostrata, Monochoria vaginalis, Sagittaria pygmaea, Cyperus difformis, Cyperus rotundus in paddy fields. Specific embodiments

[0039] To make the objectives, technical solutions and advantages of the present invention more concise and clear, the present invention will be described by the following specific embodiments. However, the present invention is by no means limited to these embodiments. The embodiments described below are only the preferred embodiments of the present invention, which can be used to describe the present invention, and should not be construed as a limitation on the scope of the present invention. It should be noted that any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

[0040] Formulation Preparation Examples

[0041] To better illustrate the present invention, the content of the present invention will be further described below in conjunction with the embodiments.

[0042] Example 1: 17% Flufenacet·Penoxsulam EC (15:2)

[0043] Formulation: 15% flufenacet, 2% penoxsulam, 30% dimethyl sulfoxide, 5% fatty alcohol polyoxyethylene ether, 9% alkylphenol polyoxyethylene polypropylene ether, 1% calcium dodecylbenzenesulfonate, methyl oleate to make up the balance;

[0044] Preparation method: Add the active ingredients flufenacet and penoxsulam to the carrier according to the formulation ratio of the example, and add surfactants and other functional auxiliaries thereto, and stir and mix evenly in a stirring and mixing kettle to obtain the EC.

[0045] Example 2: 36% Flufenacet·Pyrazosulfuron-ethyl EC (5:1)

[0046] Formulation: 30% flufenacet, 6% pyrazosulfuron-ethyl, 10% N,N-dimethyldecanamide, 2% castor oil, 3% calcium dodecylbenzenesulfonate, mesitylene to make up the balance;

[0047] Preparation method: The same as Example 1.

[0048] Example 3: 38% Flufenacet·Bispyribac-sodium EC (15:4)

[0049] Formulation: 30% flufenacet, 8% bispyribac-sodium, 10% N,N-dimethyldecanamide, 10% dimethyl sulfoxide, 10% propylene carbonate, 5% fatty alcohol polyoxyethylene ether, 12% castor oil, 3% calcium dodecylbenzenesulfonate, mesitylene to make up the balance;

[0050] Preparation method: The same as Example 1.

[0051] Example 4: 22% Flufenacet·Penoxsulam SC (10:1)

[0052] Formulation: 20% flufenacet, 2% penoxsulam, 2% sodium alkyl sulfate, 3% alkylphenol formaldehyde resin polyoxyethylene ether, 0.4% carboxymethyl cellulose, 5% propylene glycol, 0.2% isothiazolinone, deionized water to make up the balance;

[0053] Preparation method: According to the formulation ratio, add the active ingredients flufenacet, penoxsulam, surfactants and other functional auxiliaries into the reaction kettle in turn, add water and mix evenly, and then carry out high-speed shearing and wet grinding, and finally homogenize and filter to obtain the suspension product.

[0054] Example 5: 25% flufenacet·pyrazosulfuron-ethyl suspension concentrate (4:1)

[0055] Formulation: 20% flufenacet, 5% pyrazosulfuron-ethyl, 10% dodecyl polyoxyethylene ether phosphate, 2% alkyl polyoxyethylene ether sulfonate, 0.4% magnesium aluminum silicate, 0.2% carboxyethyl cellulose, 4% sorbitol, 0.1% sodium benzoate, 0.5% silicone oil, deionized water to make up the balance;

[0056] Preparation method: The same as Example 4.

[0057] Example 6: 15% flufenacet·bispyribac-sodium suspension concentrate (2:1)

[0058] Formulation: 10% flufenacet, 5% bispyribac-sodium, 8% dodecyl polyoxyethylene ether phosphate, 2% alkyl polyoxyethylene ether sulfonate, 0.4% xanthan gum, 0.1% carboxyethyl cellulose, 4% sorbitol, 0.1% sodium benzoate, 0.5% silicone oil, deionized water to make up the balance;

[0059] Preparation method: The same as Example 4.

[0060] Example 7: 30% flufenacet·penoxsulam wettable powder (1:1)

[0061] Formulation: 15% flufenacet, 15% penoxsulam, 5% calcium alkylnaphthalene formaldehyde condensate sulfonate, 6% alkylphenol polyoxyethylene ether sulfonate, 3% alkylnaphthalene sulfonate, 5% talc powder, kieselguhr to make up the balance;

[0062] Preparation method: According to the formulation ratio of the example, add the active ingredients flufenacet and penoxsulam into the carrier, add surfactants and other functional auxiliaries therein, mix, and then carry out air flow pulverization and mix again to obtain the wettable powder.

[0063] Example 8: 30% flufenacet·pyrazosulfuron-ethyl wettable powder (2:1)

[0064] Formulation: 20% flufenacet, 10% pyrazosulfuron-ethyl, 4% sodium lignosulfonate, 5% fatty alcohol polyoxyethylene ether phosphate, 4% sodium polycarboxylate, 3% sodium alkyl sulfate, 3% silica white, talc powder to make up the balance;

[0065] Preparation method: the same as Example 7.

[0066] Example 9: 16% flufenacet·bispyribac-sodium wettable powder (3:1)

[0067] Formulation: 12% flufenacet, 4% bispyribac-sodium, 4% calcium alkylnaphthalene formaldehyde condensate sulfonate, 5% sodium alkylphenol polyoxyethylene ether sulfonate, 2% sodium alkylnaphthalene sulfonate, 5% talc powder, kaolin to make up the balance;

[0068] Preparation method: the same as Example 7.

[0069] Example 10: 30% flufenacet·penoxsulam water dispersible granule (5:1)

[0070] Formulation: 25% flufenacet, 5% penoxsulam, 3% polycarboxylate GY-D06, 4% sodium dodecyl sulfate, 1% sodium alkyl sulfonate, 2% sucrose, clay to make up the balance;

[0071] Preparation method: According to the formulation ratio of the example, add the active ingredients flufenacet and penoxsulam to the carrier, and add surfactants and other functional auxiliaries thereto, mix, add 10 - 25% of water after air flow pulverization, and then obtain the water dispersible granule product through kneading, granulation, drying and screening.

[0072] Example 11: 15% flufenacet·pyrazosulfuron-ethyl water dispersible granule (2:1)

[0073] Formulation: 10% flufenacet, 5% pyrazosulfuron-ethyl, 3% polycarboxylate T36, 4% sodium dodecyl sulfate, 1% sodium alkyl sulfonate, 2% glucose, talc powder to make up the balance;

[0074] Preparation method: the same as Example 10.

[0075] Example 12: 40% flufenacet·bispyribac-sodium water dispersible granule (3:1)

[0076] Formulation: 30% flufenacet, 10% bispyribac-sodium, 4% sodium alkylnaphthalene sulfonate, 3% sodium lignosulfonate, 2% sodium dibutylnaphthalene sulfonate, 2% sodium naphthalene sulfonate, 4% sodium carboxymethyl cellulose, 5% sodium sulfate, silica white to make up the balance;

[0077] Preparation method: the same as Example 10.

[0078] Example 13: 32% flufenacet·penoxsulam dispersible oil suspension (15:1)

[0079] Formulation: 30% flufenacet, 2% penoxsulam, 2% sodium polycarboxylate, 4% agricultural emulsifier 1601#, 3% Tween-60#, 4% agricultural emulsifier 2201, 1% sodium alkyl sulfate, 0.5% bentonite, 5% propylene glycol, soybean oil to make up the balance;

[0080] Preparation method: According to the formulation ratio, the active ingredients flufenacet, penoxsulam, surfactants and other functional additives are placed in the reaction kettle in turn, added with oil and mixed evenly, subjected to high-speed shearing and wet grinding, and finally homogenized and filtered to obtain the product.

[0081] Example 14: 15% flufenacet·pyrazosulfuron-ethyl dispersible oil suspension concentrate (4:1)

[0082] Formulation: 12% flufenacet, 3% pyrazosulfuron-ethyl, 2% sodium lignosulfonate, 5% Span-60#, 5% agricultural emulsifier 700#, 4% sodium naphthalene sulfonate, 1% magnesium aluminum silicate, 4% glycerol, rapeseed oil to make up the balance;

[0083] Preparation method: The same as Example 13.

[0084] Example 15: 25% flufenacet·bispyribac-sodium dispersible oil suspension concentrate (4:1)

[0085] Formulation: 20% flufenacet, 5% bispyribac-sodium, 2% sodium lignosulfonate, 4% agricultural emulsifier 1601#, 3% Tween-60#, 4% agricultural emulsifier 2201, 4% sodium naphthalene sulfonate, 1% magnesium aluminum silicate, 4% glycerol, rapeseed oil to make up the balance;

[0086] Preparation method: The same as Example 13.

[0087] Activity test

[0088] Example 16: Test basis: NY / T1155.9-2008 "Pesticide indoor bioassay test guidelines Herbicides Part 9: Activity determination test of paddy field herbicides Stem and leaf spraying method".

[0089] Test targets: Echinochloa crusgalli, Leptochloa chinensis, Leersia oryzoides, Cyperus difformis, Eclipta prostrata, Monochoria vaginalis, Sagittaria pygmaea.

[0090] Test agents: 99% flufenacet technical, 98% penoxsulam technical, 98% pyrazosulfuron-ethyl technical, 97% bispyribac-sodium technical, provided by the R & D center of Hailir Pesticides & Chemicals Group Co., Ltd.

[0091] Agent preparation: Dissolve the technical in dimethylformamide and dilute it with 0.1% Tween 80 aqueous solution, and prepare 5 series of mass concentrations according to the equal ratio method for standby.

[0092] Test method: Quantitative grass seeds were sown in pots with a diameter of 9 cm and cultured in a light incubator. When the weeds grew to the 1-3 leaf stage, 20 plants were fixed in each pot and sprayed. After treatment, they were continuously cultured in the greenhouse, and the weed control effects of each treatment were observed regularly. After 14 days, the fresh weights of weeds in each treatment were recorded.

[0093] Test treatment: Each treatment was set with 4 replicates and a water control was set.

[0094] Data investigation: Calculate the fresh weight control effect of each treatment 14 days after spraying.

[0095] The calculation formula is as follows:

[0096] Fresh weight control effect E = (fresh weight in the control area - fresh weight in the treatment area) × 100 / fresh weight in the control area

[0097] Theoretical control effect of the mixture E0 = weed control effect when the dosage of herbicide A is P + weed control effect when the dosage of herbicide B is Q - weed control effect when the dosage of herbicide A is P × weed control effect when the dosage of herbicide B is Q ÷ 100

[0098] Evaluation criteria for the combined effect of the mixed agents:

[0099] E - E0 > 10% indicates a synergistic effect, E - E0 < -10% indicates an antagonistic effect, and E - E0 between ±10% indicates an additive effect.

[0100] The test results are shown in the following tables:

[0101] Table 1 Combined effect of the mixture of flufenacet and penoxsulam on Echinochloa crusgalli and Leptochloa chinensis

[0102]

[0103] Table 2 Combined effect of the mixture of flufenacet and penoxsulam on Monochoria vaginalis and Sagittaria pygmaea

[0104]

[0105]

[0106] Table 3 Combined effect of the mixture of flufenacet and pyrazosulfuron-ethyl on Leersia hexandra and Leptochloa chinensis

[0107]

[0108] Table 4 Combined effect of the mixture of flufenacet and pyrazosulfuron-ethyl on Monochoria vaginalis and Eclipta prostrata

[0109]

[0110]

[0111] Table 5 Joint action of flufenacet-oxadiazon and bispyribac-sodium on Leptochloa chinensis and Cyperus rotundus

[0112]

[0113]

[0114] Table 6 Joint action of flufenacet-oxadiazon and bispyribac-sodium on Monochoria vaginalis and Eclipta prostrata

[0115]

[0116] It can be seen from the indoor activity that the mixture of flufenacet-oxadiazon and one of penoxsulam, pyrazosulfuron-ethyl, and bispyribac-sodium has good indoor activity against common weeds in paddy fields. The mixing ratios of flufenacet-oxadiazon and penoxsulam are 100+10(10:1), 100+20(5:1), 100+30(10:3), 150+10(15:1), 150+20(15:2), 150+30(5:1), 200+10(20:1), 200+20(10:1), 200+30(20:3), which have good indoor activity against common weeds in paddy fields such as Echinochloa crusgalli, Leptochloa chinensis, Monochoria vaginalis, and Sagittaria pygmaea; the mixing ratios of flufenacet-oxadiazon and pyrazosulfuron-ethyl are 100+20(5:1), 100+25(4:1), 100+30(10:3), 150+20(15:2), 150+25(6:1), 150+30(5:1), 200+20(10:1), 200+25(8:1), 200+30(20:3), which have good indoor activity against common weeds in paddy fields such as Leersia hexandra, Leptochloa chinensis, Monochoria vaginalis, and Eclipta prostrata; the mixing ratios of flufenacet-oxadiazon and bispyribac-sodium are 100+30(10:3), 100+40(5:2), 100+50(2:1), 150+30(5:1), 150+40(15:4), 150+50(3:1), 200+30(20:3), 200+40(5:1), 200+50(4:1), which have good indoor activity against common weeds in paddy fields such as Cyperus rotundus, Cyperus difformis, Monochoria vaginalis, and Eclipta prostrata.

[0117] Field efficacy test

[0118] Example 17: Field efficacy test of a herbicidal composition containing flufenacet-oxadiazon.

[0119] In 2018, the inventor conducted field efficacy tests on the control of weeds in paddy fields with 24% flufenacet·penoxsulam wettable powder (5:1), 40% flufenacet·pyrazosulfuron-ethyl water dispersible granules (32:8), 20% flufenacet·bispyribac-sodium dispersible oil suspension (3:1), 10% penoxsulam water dispersible granules, 5% pyrazosulfuron-ethyl wettable powder, and 20% bispyribac-sodium dispersible oil suspension, verifying the control effect of these agents on weeds in paddy fields and their safety to rice.

[0120] The test crop was rice, and the target for control was broad-leaved and gramineous weeds in paddy fields. The herbicides were applied when the weeds were at the 2 - 5 leaf stage. The test field was flat, with loamy soil, medium fertility, and a pH value of 7.2. The test agents and dosages are shown in Table 7. A blank control was also set up. Each treatment had 4 replicates, each plot was 20 square meters, and the plots were arranged in a randomized block design. The conventional spraying method was used.

[0121] Table 7 Control effect of herbicidal compositions containing flufenacet on weeds in paddy fields

[0122]

[0123] The results of the field trials showed that the above formulation examples had good control effects on weeds in paddy fields. When the formulations were sprayed once at the above dosages, the average control efficacy on weeds in paddy fields 30 days after application reached over 90%, which was significantly better than that of each control agent. Through the significant analysis of the control efficacy differences 30 days after application, the control efficacy differences between any combination of flufenacet and penoxsulam, pyrazosulfuron-ethyl, or bispyribac-sodium and other control treatments were significant.

[0124] Safety investigation: During the test period, it was observed that all the tested agents were safe for the growth of rice, and no phytotoxicity occurred.

[0125] In summary, the composition of the present invention adopts a compounding scheme of any combination of flufenacet and penoxsulam, pyrazosulfuron-ethyl, or bispyribac-sodium. Its activity and herbicidal effect are not a simple superposition of the activities of each component. Compared with the existing single formulations, it has a significant control effect on plots with mixed occurrence of various gramineous and broad-leaved weeds, a significant synergistic effect, can delay resistance, has less pesticide residue, good safety, and meets the safety requirements of pesticide formulations.

Claims

1. Use of a herbicidal composition containing fentrazamide for controlling weeds Leersia hexandra, Leptochloa chinensis, Monochoria vaginalis and Eclipta prostrata in paddy fields, characterized in that, The active ingredients of the described composition include active ingredient A and active ingredient B, wherein active ingredient A is flufenacet and active ingredient B is pyrazosulfuron-ethyl, and the mass ratio of flufenacet to pyrazosulfuron-ethyl is 4:1 or 6:

1.

2. The herbicidal composition according to claim 1, characterized in that, The sum of the masses of active ingredient A and active ingredient B accounts for 10% - 90% of the composition.

3. The herbicidal composition according to claim 1, characterized in that, The sum of the masses of active ingredient A and active ingredient B accounts for 20% - 60% of the composition.

4. The weeding composition according to claim 1, characterized in that, The herbicidal composition is in any one of the dosage forms of emulsifiable concentrate, suspension concentrate, wettable powder, water dispersible granule, and dispersible oil suspension.

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