A herbicidal composition and use thereof

Abstract

The present application belongs to the technical field of pesticide weeding, and discloses a weeding composition and application thereof. The weeding composition comprises active ingredient A and active ingredient B. The active ingredient A is isoxaflutole, and the active ingredient B is any one of bispyribac-sodium, penoxsulam, flumetsulam. The mass ratio of the active ingredient A to the active ingredient B is 1:16-80:1. The weeding composition of the present application. The weeding composition of the present application is suitable for preventing and removing broadleaf weeds, sedge and gramineous weeds in various crop fields.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pesticide weeding, and discloses a weeding composition and application thereof. BACKGROUND

[0002] Isoxazolidine, international generic name: icafolin, CAS registration number: 2254752-27-5, belongs to a new type of isoxazole herbicide.

[0003] Florasulam is a triazolopyrimidine sulfonamide herbicide developed by Dow Agro Sciences. Florasulam is a systemic herbicide that can be conducted to the whole plant of weeds, so that the weeds are killed completely and do not recur. Florasulam has a wide herbicidal spectrum and can prevent and control most broadleaf weeds in wheat fields.

[0004] Penoxsulam is a post-emergence herbicide developed by Dow Agro Sciences, which is a triazolopyrimidine sulfonamide herbicide and acts by inhibiting acetolactate synthase. Penoxsulam is a broad-spectrum herbicide for rice fields, which can effectively prevent and control barnyard grass, annual sedge weeds and many broadleaf weeds.

[0005] Metazachlor belongs to triazolopyrimidine sulfonamides and is a typical acetolactate synthase inhibitor. By inhibiting the synthesis of branched-chain amino acids, protein synthesis is blocked, and plant growth is stopped. Metazachlor has a long residual period, a wide herbicidal spectrum and can be used for soil treatment and leaf treatment.

[0006] Weed control is mainly chemical control. At present, there are various types of herbicides on the market, and the effects of the herbicides are different. In order to improve the weeding effect, improve the safety to crops and promote the reasonable and safe use of herbicides, the present application reasonably compounds isoxazolidine and any one of florasulam, penoxsulam and metazachlor, thereby providing a basis for comprehensive control of weeds in various crop fields. SUMMARY

[0007] Based on the above, the present application aims to provide a weeding composition, which contains isoxazolidine and any one of florasulam, penoxsulam and metazachlor as active ingredients. The weeding composition expands the herbicidal spectrum and has excellent control effect on broadleaf weeds, gramineous weeds and sedge weeds in various crop fields, is safe to crops and is suitable for comprehensive control of weeds in fields.

[0008] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: a weeding composition, which contains active ingredient A and active ingredient B. The active ingredient A is isoxazolidine, the active ingredient B is any one of florasulam, penoxsulam and metazachlor, and the mass ratio of the active ingredient A to the active ingredient B is 1:16-80:1 or any value within the above range.

[0009] Further, the active ingredient B is florasulam, and the mass ratio of the active ingredient A to the active ingredient B is 5:8-40:1, or any value within the above ratio range;

[0010] The active ingredient B is penoxsulam, and the mass ratio of the active ingredient A to the active ingredient B is 1:16-16:1, or any value within the above ratio range;

[0011] The active ingredient B is metazachlor, and the mass ratio of the active ingredient A to the active ingredient B is 1:16-16:1, or any value within the above ratio range.

[0012] Further, the active ingredient B is florasulam, and the mass ratio of the active ingredient A to the active ingredient B is 5:6-20:1, or any value within the above ratio range;

[0013] The active ingredient B is penoxsulam, and the mass ratio of the active ingredient A to the active ingredient B is 1:8-8:1, or any value within the above ratio range;

[0014] The active ingredient B is metazachlor, and the mass ratio of the active ingredient A to the active ingredient B is 1:16-8:1, or any value within the above ratio range.

[0015] Further, the active ingredient in the herbicidal composition accounts for 0.01%-70% of the total weight of the herbicidal composition, based on 100wt% of the total weight of the herbicidal composition.

[0016] Further, the herbicidal composition can be prepared into a solid preparation or a liquid preparation.

[0017] Further, the solid preparation is water dispersible granule, wettable powder or granule, and the liquid preparation is suspoemulsion or dispersible oil suspension.

[0018] The application further discloses application of the herbicidal composition to the prevention and removal of weeds in crop fields.

[0019] Further, the crop field is a wheat field, a rice field, a corn field or a soybean field.

[0020] Further, the weed is a grass weed, a broadleaf weed or a sedge weed;

[0021] The grass weed is barnyard grass, leafflower, crabgrass, Chinese alpine paperbush, double-headed birdseed;

[0022] The broadleaf weeds are Galium aparine, Kochia scoparia, Jatropha gossypiifolia, Euphorbia helioscopia, Limonium gmelinii, Sesbania cannabina, Rumex japonicus, Polygonum aviculare, Potamogeton crispus, Stellaria media, Malva verticillata, Arabis paniculata, Descurania sophia, Atriplex hortensis, Amaranthus retroflexus.

[0023] The sedge weeds are Eleocharis dulcis, Cyperus difformis, Cyperus iria, Schoenoplectus juncoides.

[0024] Further, the gramineous weeds are Euphorbia lathyris, the broadleaf weeds are Galium aparine, Jatropha gossypiifolia, Polygonum aviculare, Euphorbia helioscopia, and the sedge weeds are Cyperus difformis.

[0025] In order to obtain the ideal herbicidal effect, the amount of the composition varies due to various factors, such as the crops to be protected, the type of pests, the degree of infection, the climatic conditions, the application site, the application method, the dosage form used, and the like.

[0026] The present application has the following advantages:

[0027] 1. The herbicidal composition provided by the present application can efficiently control various crop field weeds and delay the development of weed resistance.

[0028] 2. The herbicidal composition of the present application expands the herbicidal spectrum and has excellent activity against gramineous weeds, sedge weeds, and broadleaf weeds. Compared with single agents, the herbicidal composition has obvious synergistic effects, a long persistence, and can reduce the use amount of pesticides, the cost of pesticide use, and the impact on the environment. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0030] Preparation Example of Formulation:

[0031] Preparation Example 1: 22% isoxaflotole·flumetsulam suspending agent (5:6)

[0032] Formula composition: 10% isoxaflotole, 12% flumetsulam, 2% succinate sulfonate, 1% naphthalene sulfonate formaldehyde condensate, 2% aryl phenol polyoxyethylene ether phosphate, 0.25% xanthan gum, 1% magnesium aluminum silicate, 5% glycerol, 0.01% benzisothiazolinone potassium, 0.5% silicone oil, and deionized water to make up the balance.

[0033] Preparation method: according to the formula proportion, the active ingredient, surfactant and other functional additives are placed in the reaction kettle in turn, mixed with water, sheared by high speed, wet sand ground, and then filtered to obtain the suspension agent product.

[0034] Preparation example 2: 11% isoxaben · florasulam dispersible oil suspension (10:1)

[0035] Formula composition: 10% isoxaben, 1% florasulam, 3% sodium dodecyl sulfate, 5% benzyl phenol polyoxyethylene polyoxypropylene ether, 2% glycerol fatty acid ester polyoxyethylene ether, 2% calcium dodecyl benzene sulfonate, 1% silicon dioxide, 1% organic bentonite, 15% 200# solvent oil, methyl oleate to make up the balance.

[0036] Preparation method: according to the formula proportion, the active ingredient, surfactant and other functional additives are placed in the reaction kettle in turn, mixed with water, sheared by high speed, wet sand ground, and then filtered to obtain the suspension agent product.

[0037] Preparation example 3: 26% isoxaben · florasulam water dispersible granules (5:8)

[0038] Formula composition: 10% isoxaben, 16% florasulam, 8% naphthalene sulfonate formaldehyde condensate, 4% sodium dodecyl benzene sulfonate, 2% sodium dodecyl sulfate, 5% white carbon black, 30% starch, kaolin to make up the balance.

[0039] Preparation method: according to the formula proportion, the active ingredient is added to the carrier, and the surfactant and other functional additives are added to the carrier, mixed, and then 10-25% water is added after air flow crushing. Then knead, granulate, dry and sieve to obtain the water dispersible granule product; or the crushed powder is sprayed with water in the fluidized bed granulator, granulated, dried, and then sieved to obtain the product.

[0040] Preparation example 4: 21% isoxaben · florasulam wettable powder (20:1)

[0041] Formula composition: 20% isoxaben, 1% florasulam, 8% sodium lignosulfonate, 5% styrene phenol polyoxyethylene ether sulfate, 6% dispersant NNO, 10% white carbon black, kaolin to make up the balance.

[0042] Preparation method: according to the formula proportion, the active ingredient and dispersant, wetting agent and filler are mixed in the stirring kettle, and then uniformly stirred by air flow crusher for multiple times to obtain the wettable powder of the present invention composition.

[0043] Preparation example 5: 17% isoxaben · penflufen suspension (1:16)

[0044] Formulation composition: 1% isoxaben, 16% penoxsulam, 2% alkylphenol formaldehyde resin polyoxyethylene ether, 5% sorbitan oleate polyoxyethylene ether, 2% triphenyl ethenyl phenol ethoxylate phosphate, 1% sodium polycarboxylate, 1.5% magnesium aluminum silicate, 0.1% carboxymethyl cellulose, 1% sodium sorbate, 5% glycerol, 0.5% silicone oil, deionized water to make up the balance.

[0045] Preparation method: same as Preparation Example 1.

[0046] Preparation Example 6: 15% isoxaben·penoxsulam dispersible oil suspension (1:1)

[0047] Formulation composition: 7.5% isoxaben, 7.5% penoxsulam, 5% castor oil polyoxyethylene ether, 12% glycerol fatty acid ester polyoxyethylene ether, 21% sodium dodecyl sulfate, 1% sodium polycarboxylate, 1% naphthalene sulfonate formaldehyde condensate, soybean oil to make up the balance.

[0048] Preparation method: same as Preparation Example 2.

[0049] Preparation Example 7: 25% isoxaben·penoxsulam water dispersible granules (1:4)

[0050] Formulation composition: 5% isoxaben, 20% penoxsulam, 5% naphthalene sulfonate formaldehyde condensate, 2.5% laopen powder BX, 1.5% sodium dodecylbenzenesulfonate, 5% white sugar, kaolin to make up the balance.

[0051] Preparation method: same as Preparation Example 3.

[0052] Preparation Example 8: 0.3% isoxaben·penoxsulam granules (1:2)

[0053] Formulation composition: 0.1% isoxaben, 0.2% penoxsulam, 2% sodium lignosulfonate, 2% potassium humate, 12% white carbon black, 1% carboxymethyl cellulose, quartz sand to make up the balance.

[0054] Preparation method: according to the formulation ratio, the active ingredient, dispersant and auxiliary agent are uniformly pulverized and mixed to prepare a master powder, the master powder and the carrier are added to a coating granulator and stirred, the prepared binder aqueous solution is added while stirring, and after uniform mixing, the product is discharged, dried and sieved to obtain the granules.

[0055] Preparation Example 9: 18% isoxaben·flumetsulam suspension (1:8)

[0056] Formulation composition: 2% isoxaben, 16% flumetsulam, 1% glycerol fatty acid ester polyoxyethylene ether, 4% alkylphenol polyoxyethylene ether phosphate, 1% sodium lignosulfonate, 0.25% xanthan gum, 5% ethylene glycol, 0.1% sodium benzoate, 0.5% silicone oil, deionized water to make up the balance.

[0057] Preparation method: same as Preparation Example 1.

[0058] Preparation Example 10: 18% isoxaben·flumetsulam dispersible oil suspension (2:1)

[0059] Formulation composition: 12% isoxaben, 6% flumetsulam, 1% ethylene glycol oxyethylene polyoxypropylene ether, 15% glycerol fatty acid ester polyoxyethylene ether phosphate, 1% calcium dodecylbenzenesulfonate, 2% fatty alcohol polyoxyethylene ether sulfate, 1.5% magnesium aluminum silicate, 1% Tesc 869, corn oil to make up the balance.

[0060] Preparation method: same as Preparation Example 2.

[0061] Preparation Example 11: 27% isoxaben·flumetsulam water dispersible granules (8:1)

[0062] Formulation composition: 24% isoxaben, 3% flumetsulam, 10% succinate sulfonate, 2% polycarboxylic acid sodium salt, 2% sodium dodecyl sulfate, 10% ammonium sulfate, starch to make up the balance.

[0063] Preparation method: same as Preparation Example 3.

[0064] Preparation Example 12: 30% isoxaben·flumetsulam wettable powder (1:4)

[0065] Formulation composition: 6% isoxaben, 24% flumetsulam, 5% sodium lignosulfonate, 3% sodium octylphenol polyoxyethylene ether sulfonate, 2% Laka powder BX, 5% white carbon black, kaolin to make up the balance.

[0066] Preparation method: same as Preparation Example 4.

[0067] Test Example 1: indoor biological activity determination.

[0068] Test basis: the test refers to NY / T 1155.4 2006 “Pesticide Indoor Biological Determination Test Guidelines Herbicide Part 4: Activity Determination Test Stem-leaf Spray Method”.

[0069] Test target: Galium aparine, Jatropha curcas, Veronica longifolia, Sonchus oleraceus.

[0070] Instrument equipment: light incubator, quantitative spray equipment, electronic balance, pot, pipette, etc.

[0071] Test soil: The test uses organic matter content ≤3%, pH neutral, good air permeability, sieved and air-dried loam soil.

[0072] Test materials: The test soil is quantitatively filled to 4 / 5 of the pot, and then the soil is completely saturated by bottom drip irrigation. The pretreated test weed seeds are uniformly sown on the soil surface, and the soil is covered with 0.5-2 cm according to the size of the seeds. After sowing, it is moved into the greenhouse for conventional culture, and the bottom drip irrigation is used for water replenishment. After the weeds germinate, the seedlings are thinned to ensure the density of the weeds.

[0073] Test chemicals: isoxaflotole, florasulam, metazachlor.

[0074] Chemical preparation: The above technical materials are dissolved with appropriate solvents, and then diluted with 0.1% Tween 80 aqueous solution.

[0075] Chemical treatment: According to the test design, the stem and leaf spraying treatment is carried out from low dose to high dose. Each treatment has 4 repetitions, and a treatment without chemicals is set as a blank control. After treatment, the test materials are naturally air-dried on the surface, and then moved into the greenhouse for conventional culture.

[0076] Investigation: The herbicidal activity is investigated and recorded by absolute value investigation method 14 days after treatment.

[0077] Calculation method:

[0078] Fresh weight control effect E = (control area fresh weight-treatment area fresh weight) x 100 / control area fresh weight

[0079] The combined effect of the mixed preparation is determined by Gowing method, and the calculation formula is as follows:

[0080] Theoretical control effect E0 of mixed preparation = weed control effect of herbicide A with dosage P + weed control effect of herbicide B with dosage Q - weed control effect of herbicide A with dosage P x weed control effect of herbicide B with dosage Q ÷ 100

[0081] Evaluation standard of combined effect of mixed preparation:

[0082] E-E0>10% is synergistic effect, E-E0<-10% is antagonistic effect, and E-E0 is between ±10% is additive effect.

[0083] Test results:

[0084]

[0085] The indoor test results show that the isoxadifen-ethyl and florasulam are compounded in the mass ratio of 5:8~80:1, and the pigweed shows additive or synergistic effect; the isoxadifen-ethyl and florasulam mass ratio is 5:8~40:1, and the pigweed shows synergistic effect.

[0086]

[0087] The indoor test results show that the isoxadifen-ethyl and florasulam are compounded in the mass ratio of 5:8~80:1, and the pigweed shows additive or synergistic effect; the isoxadifen-ethyl and florasulam mass ratio is 5:8~40:1, and the pigweed shows synergistic effect.

[0088]

[0089] The indoor test results show that the isoxadifen-ethyl and florasulam are compounded in the mass ratio of 5:8~80:1, and the pigweed shows additive or synergistic effect; the isoxadifen-ethyl and florasulam mass ratio is 5:8~40:1, and the pigweed shows synergistic effect.

[0090]

[0091] The indoor test results show that the isoxadifen-ethyl and florasulam are compounded in the mass ratio of 5:8~80:1, and the pigweed shows additive or synergistic effect; the isoxadifen-ethyl and florasulam mass ratio is 5:8~40:1, and the pigweed shows synergistic effect.

[0092] Test Example 2: Indoor biological activity determination.

[0093] Test basis: The test refers to NY / T 1155.5-2006 "Pesticide indoor biological determination test guidelines herbicide part 5: paddy field herbicide soil activity determination test".

[0094] Test target: leafflower, earthnutweed, andcarex.

[0095] Test material: The organic matter content is ≤2%, the pH is neutral, and the air-dried soil is sieved, then the soil is filled to 3 / 4 of the pot, and then the pot is irrigated from the top to make the soil completely wet and saturated. The test weed seeds are evenly and quantitatively sown on the soil surface, and the soil is covered 0.5cm~2cm according to the size of the seeds, and the seeds are reserved after 24h of sowing.

[0096] Test agent: isoxadifen-ethyl technical material and florasulam technical material.

[0097] Agent preparation: The above technical material is dissolved with a suitable solvent, and then diluted with 0.1% Tween 80 aqueous solution.

[0098] Chemical treatment: Before treatment, watering was carried out to maintain a water layer of 1-2 cm. A certain amount of chemicals was taken with a pipette and watering was carried out according to the test design from low dose to high dose. Each treatment was repeated 4 times, and a treatment without chemicals was set as a blank control. After treatment, the test materials were moved into the greenhouse for cultivation, and a water layer of 1-2 cm was maintained during the test period.

[0099] Investigation: 14 days after treatment, the herbicidal activity was investigated and recorded by absolute value investigation method.

[0100] Calculation method:

[0101] Fresh weight control effect E = (control area fresh weight - treatment area fresh weight) x 100 / control area fresh weight

[0102] The combined effect of the mixed preparation was determined by Gowing method, and the calculation formula was as follows:

[0103] Theoretical control effect E0of mixed preparation = weed control effect of herbicide A at dosage P + weed control effect of herbicide B at dosage Q - weed control effect of herbicide A at dosage P x weed control effect of herbicide B at dosage Q ÷ 100

[0104] Evaluation standard of combined effect of mixed preparation:

[0105] E-E0>10% is synergistic effect, E-E0<-10% is antagonistic effect, and E-E0is between ±10% is additive effect.

[0106] Test results:

[0107]

[0108] The indoor test results showed that reasonable compounding of isoxaflotole and penoxsulam within the mass ratio range of 1:16-8:1 showed synergistic effect on Euphorbia lathyris.

[0109]

[0110] The indoor test results showed that reasonable compounding of isoxaflotole and penoxsulam within the mass ratio range of 1:16-8:1 showed synergistic effect on Euphorbia lathyris.

[0111]

[0112] The indoor test results showed that reasonable compounding of isoxaflotole and penoxsulam within the mass ratio range of 1:8-16:1 showed synergistic effect on Isoetes.

[0113] Field efficacy example 3: Wheat field weed control test.

[0114] The test field is located in a wheat field in Zhang Zhaozhuang Village, Shundian Town, Yuzhou City, Henan Province. The test field has many species and quantities of weeds, and no herbicide was used in the previous crop.

[0115] The main weeds in wheat fields are: Galium aparine, Descurania sophia, Brassica campus, Veronica, Stellaria media, and broadleaf weeds such as Aegilops.

[0116] Test design: All test plots are arranged in random blocks, with 8 treatments, 4 repetitions, a total of 32 plots, each plot area is 20m 2 .

[0117] Spraying equipment: Spraying is done with a backpack Shandong Weishi ws-16 type manual sprayer, with a water output of 0.5-0.6L / min.

[0118] Spraying time and frequency: Spraying was done once in early December 2024, when the weed population in each treatment plot was large.

[0119] Investigation of drug efficacy: The absolute value investigation method was used, 4 points were randomly selected in each plot, each point area was 0.5m x 0.5m, and the number of each weed was counted 15d and 30d after spraying; Fresh weight of weeds above ground was measured 30d after spraying and control effect was calculated.

[0120] Drug efficacy calculation formula:

[0121]

[0122]

[0123] The results of the field efficacy test showed that 30d after spraying, the 7 kinds of agents had obvious control effect on weeds in the test range. Preparation example 10: 18% isoxafliprole • flumetsulam dispersible oil suspension (2:1), preparation example 9: 18% isoxafliprole • flumetsulam suspension (1:8), preparation example 4: 21% isoxafliprole • florasulam wettable powder (20:1), preparation example 1: 22% isoxafliprole • florasulam suspension (5:6) had significant control effect on weeds in wheat fields.

[0124] Field efficacy example 4: Rice field weed control test.

[0125] Test site: The test was conducted in a rice field in Wenjin Community, Jixian Town, Chongzhou City, Sichuan Province. The test site is loam soil with medium to high fertility. No other herbicides were applied during the test period, and there was no watering or fertilization management. The test conditions in each plot were basically the same.

[0126] Test crop: Rice.

[0127] Test plot arrangement: The test totally sets 5 treatments, each treatment repeats 4 times, each test plot is arranged randomly in groups, and the area of each test plot is 20 m 2 . Small dikes are built between plots to prevent water from mixing.

[0128] Application time and method: The test is applied once, the application time is June 12, 2024, and the rice is at 2-3 leaf stage. Use Gongnong-16 knapsack sprayer to spray, and mix the pesticide with water according to the mass concentration of the test design to form pesticide solution, and spray uniformly.

[0129] Investigation content and method: 20 days after application, the weed plant control effect is investigated; 40 days after application, the weed plant control effect and fresh weight control effect are investigated. Investigate 4 points in each plot, 0.25 m 2 in each point, and calculate the number of each weed plant or fresh weight respectively.

[0130] After application, investigate whether the rice is harmed, accurately describe the symptoms of rice drug damage (growth inhibition, green fading, scab, deformity, etc.) if the rice is damaged, and record the symptoms of damage, the time of recovery to normal growth, and the influence on rice tillering and plant height in detail.

[0131] Before the rice is harvested, observe whether the pesticide treatment area delays maturity. When harvesting, measure the yield of each treatment area and calculate the yield increase rate.

[0132] Pesticide efficacy calculation formula:

[0133]

[0134]

[0135] According to visual observation, the target crops and surrounding crops in each pesticide treatment have good safety, no drug damage symptoms are observed, and there is no influence on non-target organisms.

[0136] 20 days after application, the plant control effect investigation was carried out, preparation example 6: 15% isoxafliprole • penoxsulam dispersible oil suspension (1:1), preparation example 8: 0.3% isoxafliprole • penoxsulam granules (1:2) active ingredient dosage of 22.5 g / ha treatment of plant control effect on weeds is 88.75%~91.70%. The control pesticide 25 g / l penoxsulam dispersible oil suspension and 20% isoxafliprole emulsion oil have poor control effect on weeds, and the plant control effect is 74.45% and 70.32% respectively.

[0137] The plant protection effect of the weeds was investigated 40 days after the application of the herbicides. The plant protection effect of the weeds was 90.04%~94.13% when the effective component of the 15% isoxaflotole•penoxsulam dispersible oil suspensions (1:1) of Preparation Example 6 and the 0.3% isoxaflotole•penoxsulam granules (1:2) of Preparation Example 8 was 22.5g / ha. The control herbicides, 25g / l penoxsulam dispersible oil suspensions and 20% isoxaflotole emulsifiable concentrate, had relatively poor plant protection effect on the weeds, and the plant protection effect was 80.65% and 78.64%, respectively.

[0138] The yield of the rice was determined when the rice was harvested. The rice in the treatment area treated with the 15% isoxaflotole•penoxsulam dispersible oil suspensions (1:1) of Preparation Example 6 and the 0.3% isoxaflotole•penoxsulam granules (1:2) of Preparation Example 8 was normal and consistent at the mature stage, and the yield was increased significantly, and the yield increase rate was 33.84% and 31.50%, respectively.

[0139] Although the present application has been described in detail with general description and specific embodiments above, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art, and thus, these modifications or improvements made on the basis of the spirit of the present application are within the scope of the present application.

Claims

1. A herbicidal composition, characterized by comprising: The herbicidal composition contains active ingredient A and active ingredient B, the active ingredient A is isoxaflotole, the active ingredient B is any one of florasulam, penoxsulam, flumetsulam, The active ingredient B is florasulam, the mass ratio of the active ingredient A to the active ingredient B is 5:6-20:1; The active ingredient B is florasulam, the mass ratio of the active ingredient A to the active ingredient B is 5:6-20:1; The active ingredient B is florasulam, the mass ratio of the active ingredient A to the active ingredient B is 5:6-20:

1.

2. The herbicidal composition according to claim 1, characterized by The total weight of the herbicidal composition is 100wt%, the active ingredient in the herbicidal composition accounts for 0.01%-70% of the total weight of the herbicidal composition.

3. The herbicidal composition according to claim 1, characterized by The preparation form of the herbicidal composition is solid preparation or liquid preparation.

4. The herbicidal composition according to claim 3, characterized by The solid preparation is water dispersible granule, wettable powder, granule, the liquid preparation is suspoemulsion, dispersible oil suspension.

5. The herbicidal composition according to any one of claims 1-4 for preventing and removing weeds in crop fields.

6. Use according to claim 5, characterized in that, The crop field is wheat field, rice field, corn field or soybean field.

7. Use according to claim 5, characterized in that, The weed is chenopodium anthelminticum, galium aparine, euphorbia helioscopia, vernonia anthelmintica, spinacia oleracea, egeria densa, cyperus difformis.

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