Weeding composition and application thereof

Abstract

The invention belongs to the technical field of pesticide weeding, and discloses a weeding composition and application thereof.The weeding composition comprises an active ingredient A and an active ingredient B. The active ingredient A is isoxamid or isoxamid methyl ester, and the active ingredient A is any one of pyriminobac-methyl, pyribenzoxim or bispyribac-sodium; the mass ratio of the active component A to the active component B is (1: 6)-(12: 1). The weeding composition disclosed by the invention has an obvious synergistic effect on weeds in paddy fields.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticide weeding and discloses a weeding composition and application thereof. Background Art

[0002] Weeds in rice paddies compete with rice for nutrients, space, light, and other resources, negatively impacting rice growth and development, hindering high yields and quality. Therefore, weed control is crucial for ensuring rice yield and quality. Currently, weed control still primarily relies on chemical methods, but the continuous use of herbicides with a single mechanism of action has led to increasingly prominent problems such as weed resistance. Therefore, identifying highly effective, safe, and labor-saving herbicide products is crucial. Summary of the Invention

[0003] Based on the above, the present invention provides a herbicide composition that effectively controls various types of weeds commonly found in rice fields, including grasses, broadleaf weeds, and sedge weeds. The composition is highly safe for rice and does not harm subsequent crops. It can be used for the integrated control of resistant weeds in rice fields.

[0004] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a herbicidal composition, the herbicidal composition comprising active ingredient A and active ingredient B, the active ingredient A is isoxaclostrobin or isoxaclostrobin methyl ester, and the active ingredient B is any one of pyrifos-butyl, pyrifos-butyl or bispyribac-butyl; the mass ratio of the active ingredient A to the active ingredient B is 1:6 to 12:1, or any value within the above numerical range.

[0005] Furthermore, the mass ratio of isoxadiazole to pyrifos-butyl is 1:5 to 9:1, or any value within the above numerical range;

[0006] The mass ratio of clofamid-methyl to pyrifos-butyl is 1:6 to 6:1, or any value within the above numerical range;

[0007] The mass ratio of isoxadiazole to saflufenacil is 1:6 to 6:1, or any value within the above numerical range;

[0008] The mass ratio of clofamid methyl to saflufenacil is 1:5 to 6:1, or any value within the above numerical range;

[0009] The mass ratio of isoxadiazole to bispyribac-sodium is 1:6 to 12:1, or any value within the above numerical range;

[0010] The mass ratio of the isoxadiazine methyl to bispyribac-sodium is 1:6 to 9:1, or any value within the above numerical range.

[0011] Furthermore, the mass ratio of isoxadiazole to pyrifos-butyl is 1:4 to 9:1, or any value within the above numerical range;

[0012] The mass ratio of clofamid-methyl to pyrifos-butyl is 1:4 to 6:1, or any value within the above numerical range;

[0013] The mass ratio of isoxadiazole to saflufenacil is 1:5 to 9:2, or any value within the above numerical range;

[0014] The mass ratio of clofamid methyl to saflufenacil is 1:5 to 6:1, or any value within the above numerical range;

[0015] The mass ratio of isoxadiazole to bispyribac-sodium is 1:6 to 9:1, or any value within the above numerical range;

[0016] The mass ratio of the isoxadiazine methyl to bispyribac-sodium is 1:6 to 6:1, or any value within the above numerical range.

[0017] Furthermore, based on 100 wt % of the herbicidal composition, the active ingredient A and the active ingredient B account for 1% to 80% of the total weight of the herbicidal composition, or any value within the above numerical range.

[0018] Furthermore, the herbicidal composition contains other auxiliary ingredients in addition to the active ingredients, and the auxiliary ingredients are selected from one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoaming agents, solvents, preservatives, stabilizers, synergists or carriers.

[0019] Furthermore, the herbicidal composition can be prepared in the form of a liquid preparation or a solid preparation.

[0020] Furthermore, the liquid preparation is a suspension, emulsifiable concentrate, dispersible oil suspension, microemulsion, or aqueous emulsion; the solid preparation is a wettable powder, granules, or water-dispersible granules.

[0021] The invention also discloses application of the above-mentioned herbicidal composition for preventing and controlling weeds in rice fields.

[0022] Furthermore, the weeds are annual weeds, and the weeds are grass weeds, broadleaf weeds or sedge weeds.

[0023] Furthermore, the grass weeds are barnyard grass, rice clover, loblolly grass, alopecuroides, crabgrass, and goosegrass; the broad-leaved weeds are schizonepeta, raindrops, knotweed, duckweed, dwarf arrowhead, Polygonum multiflorum, and pondweed; the sedge weeds are cyperus, cyperus cardia, and cyperus rotundus.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. The herbicidal composition provided by the present invention can effectively control weeds in rice fields and delay the development of weed resistance;

[0026] 2. The herbicidal composition of the present invention has a broadened weed control spectrum and has excellent activity against grass weeds, sedge weeds and broadleaf weeds. Compared with a single agent, the control effect on the above weeds has a significant synergistic effect and a long lasting effect, which can reduce the dosage of pesticides used, reduce the cost of medicines, and reduce the impact on the environment. DETAILED DESCRIPTION

[0027] The following will be combined with the preparation examples and specific embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] The following preparation examples have been tested and found to meet the quality and technical indicators required for the corresponding preparations. The preparations prepared are qualified preparations recognized in the art.

[0029] Preparation Example Preparation method:

[0030] 1. Suspension concentrate: According to the formula ratio, the active ingredients, surfactants and other functional additives are placed in the reactor in sequence, water is added and mixed evenly, and the suspension concentrate product is obtained by high-speed shearing, wet sand grinding, and finally homogenization filtration.

[0031] 2. Water-dispersible granules: According to the formula ratio, the active ingredient is added to the carrier, and surfactants and other functional additives are added thereto, mixed, and after air flow grinding, 10-25% water is added, and then the mixture is kneaded, granulated, dried, and sieved to obtain water-dispersible granules. Alternatively, the pulverized powder is sprayed with water in a boiling granulator, granulated, dried, and then sieved to obtain the product.

[0032] 3. Emulsifiable concentrate: According to the formula ratio, the active ingredient, solvent, and cosolvent are added to a mixing kettle and stirred to dissolve them. Then, an emulsifier is added and the balance is supplemented with the remaining solvent. The mixture is stirred evenly in a stirred kettle and filtered to obtain the desired emulsifiable concentrate of the present invention.

[0033] 4. Wettable powder: According to the formula ratio, the active ingredients, dispersants, wetting agents and fillers are mixed, uniformly stirred in a stirring tank, and pulverized and mixed uniformly multiple times in a jet mill to prepare the wettable powder of the composition of the present invention.

[0034] 5. Emulsion in water: Dissolve the active ingredient in the solvent according to the formula ratio and add emulsifier to dissolve it into a uniform oil phase. Mix deionized water, antifreeze, etc. together to form a uniform water phase. Under high-speed shearing, add the oil phase to the water phase. After shearing to a qualified particle size, add defoamer, thickener, and preservative and stir evenly to form a well-dispersed emulsion in water product.

[0035] 6. Dispersible oil suspension: According to the formula ratio, the active ingredients, surfactants and other functional additives are placed in the reactor in sequence, oil is added and mixed evenly, and the dispersible oil suspension product is obtained by high-speed shearing, wet sand grinding, and finally homogenization filtration.

[0036] 7. Microemulsion: According to the formula ratio, mix the active ingredients, solvents, emulsifiers, etc. to obtain the oil phase, mix the antifreeze and water to obtain the water phase, add the oil phase to the water phase while stirring, and continue shearing for 10 minutes. Then add the defoaming agent and stir evenly to obtain small droplets of oil phase particles of 0.01 to 0.1 microns, which is the microemulsion product.

[0037] Preparation Example 1: 28% isoxadiazole·pyrimidine wettable powder (6:1)

[0038] Formula composition: 24% isoxadiazole, 4% pyrimidine, 3% sodium salt of polycarboxylate, 2% naphthalenesulfonate formaldehyde condensate, 2.5% opening powder BX, 6% white carbon black, and kaolin to make up the balance.

[0039] Preparation Example 2: 24% isoxadiazole·pyrimidine suspension (3:1)

[0040] Formula composition: 18% isoxadiazole, 6% pyrimidine, 2% sodium lauryl sulfate, 2% sodium alkyl polyoxyethylene ether sulfonate, 3% aromatic phenol polyoxyethylene ether phosphate, 0.25% xanthan gum, 1% magnesium aluminum silicate, 5% ethylene glycol, 0.1% sodium benzoate, 0.5% silicone oil, and deionized water to make up the balance.

[0041] Preparation Example 3: 12% methyl isoxadiazine·pyrimidine-butyl dispersible oil suspension (1:1)

[0042] Formula composition: 6% isocyanate methyl, 6% pyrimidine, 3% lignin sulfonate, 15% castor oil polyoxyethylene ether, 3% phenethylphenol polyoxyethylene polyoxypropylene ether, 3% fatty alcohol polyoxyethylene ether, 2% calcium dodecylbenzenesulfonate, 1% silicon dioxide, 1% organic bentonite, and soybean oil makes up the balance.

[0043] Preparation Example 4: 16% methyl isoxadiazine·pyrimidine suspension (1:3)

[0044] Formula composition: 4% isoxadiazole methyl, 12% pyrimidine, 2% Guerbet alcohol polyoxyethylene ether, 1% fatty alcohol polyoxyethylene ether sodium sulfate, 2% tristyrylphenol ethoxylate phosphate, 2% sorbitan oleate polyoxyethylene ether, 0.25% xanthan gum, 1% magnesium aluminum silicate, 5% ethylene glycol, 0.1% potassium benzoate, 0.5% silicone oil, and deionized water to make up the balance.

[0045] Preparation Example 5: 15% isoxadiazole·pyrimidine hydrochloride emulsifiable concentrate (1:2)

[0046] Formula composition: 5% isoxadiazole, 10% pyrimidine oxime, 15% DMF, 15% tristyrylphenol polyoxyethylene ether polyoxypropylene ether, 3% calcium dodecylbenzenesulfonate, 15% propylene carbonate, and xylene makes up the balance.

[0047] Preparation Example 6: 11% isoxadiazole·pyrimidine oxime dispersible oil suspension (9:2)

[0048] Formula composition: 9% isoxadiazole, 2% pyrimidine oxime, 1% fatty alcohol polyoxyethylene ether, 15% castor oil polyoxyethylene ether, 2% calcium dodecylbenzenesulfonate, 2% succinate sulfonate, 1.5% magnesium aluminum silicate, 1% Tesco 869, and corn oil makes up the balance.

[0049] Preparation Example 7: 10% methyl isoxadiazine·safenac emulsion in water (3:2)

[0050] Formula composition: 6% isoxadiazole methyl ester, 4% pyrimidine oxime, 4% ethylene glycol oxyethylene polyoxypropylene ether, 2% castor oil polyoxyethylene ether phosphate, 15% cyclohexanone, 5% trimethylbenzene, 0.1% xanthan gum, 0.2% isothiazolinone, 5% propylene glycol, 1.5% urea, 0.3% sodium sorbate, 0.1% silicone defoaming agent, and deionized water to make up the balance.

[0051] Preparation Example 8: 12% methyl isoxadiazine·safenac microemulsion (3:1)

[0052] Formula composition: 9% isocyanate methyl ester, 3% pyrimidine oxime, 18% cyclohexanone, 15% tristyrylphenol polyoxyethylene ether, 3% anhydrous sorbitan oleate polyoxyethylene ether, 2% fatty alcohol polyoxyethylene ether sodium sulfate, 0.05% silicone defoamer, and deionized water to make up the balance.

[0053] Preparation Example 9: 21% isoxadiazole·bispyribac-sodium suspension (6:1)

[0054] Formula composition: 18% isoxadiazole, 3% bispyribac-sodium, 1% Guerbet alcohol polyoxyethylene ether, 2% naphthalenesulfonate formaldehyde condensate, 3% tristyrylphenol polyoxyethylene ether phosphate, 2% isomeric tridecyl alcohol polyoxyethylene ether, 0.25% xanthan gum, 1% magnesium aluminum silicate, 5% propylene glycol, 0.15% potassium benzoate, 0.5% silicone oil, and deionized water to make up the balance.

[0055] Preparation Example 10: 28% isoxadiazole·bispyribac-sodium wettable powder (1:3)

[0056] Formula composition: 7% isoxadiazole, 21% bispyribac-sodium, 2% sodium alkyl polyoxyethylene ether sulfonate, 3% alkyl naphthalene sulfonate, 5% sodium polynaphthaldehyde sulfonate, 2% sodium lauryl sulfate, 10% kaolin, 10% white carbon black, and bentonite to make up the balance.

[0057] Preparation Example 11: 16% methyl isoxadiazine·bispyribac-sodium dispersible oil suspension (3:1)

[0058] Formula composition: 12% isoxadiazole methyl, 4% bispyribac-sodium, 3% phenethylphenol polyoxyethylene polyoxypropylene ether, 15% castor oil polyoxyethylene ether, 2% calcium dodecylbenzenesulfonate, 1% sodium salt of polycarboxylate, and soybean oil makes up the balance.

[0059] Preparation Example 12: 24% clofamid-methyl·bispyribac-sodium water dispersible granules (1:2)

[0060] Formula composition: 8% isoxadiazole methyl, 16% bispyribac-sodium, 8% succinate sulfonate, 5% naphthalenesulfonate formaldehyde condensate, 2% sodium lauryl sulfate, 30% starch, and kaolin makes up the balance.

[0061] Example 1: Indoor weed control biological activity test

[0062] Test basis: The test refers to NY / T 1155.5-2006 "Guidelines for Indoor Bioassay of Pesticides - Herbicides Part 5: Soil Activity Test of Paddy Field Herbicides - Irrigation Method".

[0063] Test targets: Echinochloa crusgalli, Li's rice, Alopecurus macrostachya, Snakehead antler, Rain flower, Aconite, Cyperus difformis, Cyperus angustifolia.

[0064] Test agents: isoxadiazole technical, isoxadiazole methyl ester technical, pyrimidinesulfuron technical, pyrimidinesulfuron technical, and bispyribac-sodium technical.

[0065] Preparation of medicine: Dissolve the above raw medicines with a suitable solvent, and then dilute with 0.1% Tween 80 aqueous solution to prepare single-dose stock solutions. Experimentally design and prepare different ratios. Each single dose and each group of mixed ratios are prepared into the required series of mass concentrations.

[0066] Test Method: Black plastic pots (15 cm in diameter and 8 cm in height) were filled with sterilized fine soil to a depth of 6 cm and placed in a plastic tray filled with water. The water was allowed to gradually seep in. Once the soil had absorbed sufficient moisture, 30 to 50 weed seeds were sown in each pot and covered with soil to a depth of 0.2 to 1 cm, depending on seed size. After sowing, the pots were placed in a greenhouse at a temperature of 25-30°C and a relative humidity of 65% to 85%. Weeds were sprayed when they reached the 4-5 leaf stage. Before spraying, weak seedlings were thinned out, and the seedlings were set to 10 per pot. Based on the preliminary test results, the above pesticides were sprayed according to the experimental design, with a clear water control treatment included. Each treatment was replicated four times. The sprayer was an ASS-4 automatic spray station manufactured by the Beijing Agricultural Information Technology Research Center, equipped with a fan nozzle and a spray pressure of 275 kPa. During spraying, the pots were placed on the spray station, with the nozzle adjusted to a distance of 50 cm from the top of the pots, and sprayed evenly according to the designed dosage. After spraying, observe and record weed damage symptoms at irregular intervals, such as growth inhibition, chlorosis, and deformity. Weigh and record the fresh weight of the aboveground parts of weeds 14 days after spraying, and calculate the fresh weight control efficacy using the following formula.

[0067] Calculation method: Fresh weight control effect E = (fresh weight of weeds in the control area - fresh weight of weeds in the treatment area) × 100 / fresh weight of weeds in the control area

[0068] The combined effect of the mixture was determined using the Gowing method, and the calculation formula is as follows:

[0069] Theoretical control effect of mixture E0 = weed control effect of herbicide A at a dosage of P + weed control effect of herbicide B at a dosage of Q - weed control effect of herbicide A at a dosage of P × weed control effect of herbicide B at a dosage of Q ÷ 100

[0070] Evaluation criteria for the combined effects of mixed drugs:

[0071] E-E0>10% is a synergistic effect, E-E0<-10% is an antagonistic effect, and E-E0 between ±10% is an additive effect.

[0072] Test results:

[0073] Table 1 Results of indoor biological activity test on isoxadiazole and pyrifos-butyl compound against barnyardgrass

[0074]

[0075]

[0076] The laboratory test results in Table 1 show that combining clomaconazole with pyrimidine in an appropriate mass ratio has a good control effect on the grass weed barnyardgrass. When the mass ratio of clomaconazole to pyrimidine is between 1:5 and 12:1, the E-E0 is greater than -10%, indicating an additive or synergistic effect. When the mass ratio of clomaconazole to pyrimidine is between 1:5 and 9:1, the E-E0 is greater than 10%, indicating a synergistic effect. The synergistic effect is most pronounced when the mass ratio of clomaconazole to pyrimidine is 3:1.

[0077] Table 2 Results of the indoor bioactivity test on the intestine of snakehead fish of the compound of isoxafoetida-methyl and pyrifos-butyl

[0078]

[0079] The laboratory test results in Table 2 show that combining clomaconazole and pyrifos-butyl in an appropriate mass ratio has a good control effect on the broadleaf weed snakehead. When the mass ratio of clomaconazole to pyrifos-butyl is 1:5 to 12:1, the E-E0 is greater than -10%, indicating an additive or synergistic effect. When the mass ratio of clomaconazole to pyrifos-butyl is 1:4 to 9:1, the E-E0 is greater than 10%, indicating a synergistic effect. The synergistic effect is most pronounced when the mass ratio of clomaconazole to pyrifos-butyl is 1:1.

[0080] Table 3 Results of indoor biological activity test of isoxaclorac and pyrifos-butyl on Cyperus heteromorphus

[0081]

[0082] The indoor test results in Table 2 show that combining clomaconazole with pyrimidine in an appropriate mass ratio has a good control effect on the Cyperaceae weed Cyperus diversiformis. When the mass ratio of clomaconazole to pyrimidine is between 1:5 and 12:1, the E-E0 is greater than -10%, indicating an additive or synergistic effect. When the mass ratio of clomaconazole methyl to pyrimidine is between 1:4 and 6:1, the E-E0 is greater than 10%, indicating a synergistic effect. The synergistic effect is most pronounced when the mass ratio of clomaconazole methyl to pyrimidine is 1:3.

[0083] Table 4 Results of indoor biological activity test on the combination of isoxadiazole-methyl and pyrifoxifen-butyl on rice Lishihe

[0084]

[0085]

[0086] The indoor test results in Table 4 show that combining clomaconazole and saflufenacil in an appropriate mass ratio has a good control effect on the grass weed rice graminoid, Li's grass. When the mass ratio of clomaconazole to saflufenacil is 1:6 to 6:1, the E-E0 is greater than -10%, indicating an additive or synergistic effect. When the mass ratio of clomaconazole to saflufenacil is 1:5 to 6:1, the E-E0 is greater than 10%, indicating a synergistic effect. The synergistic effect is most significant when the mass ratio of clomaconazole to saflufenacil is 3:2.

[0087] Table 5 Results of indoor biological activity test on the combination of isoxadiazole and pyrifoxifen on Flos lycopersici

[0088]

[0089] The indoor test results in Table 5 show that combining clomaconazole with saflufenacil in an appropriate mass ratio has a good control effect on the broadleaf weed Myrica rapa. When the mass ratio of clomaconazole to saflufenacil is 1:6 to 6:1, the E-E0 is greater than -10%, indicating an additive or synergistic effect. When the mass ratio of clomaconazole to saflufenacil is 1:5 to 9:2, the E-E0 is greater than 10%, indicating a synergistic effect. The synergistic effect is most pronounced when the mass ratio of clomaconazole to saflufenacil is 1:2.

[0090] Table 6 Results of indoor biological activity test on Cyperus diversifolia by combining oxadiazine-methyl and pyrifos-butyl

[0091]

[0092] The laboratory test results in Table 6 show that combining clomaconazole and fenfluramide in an appropriate mass ratio demonstrated excellent control effectiveness against the Cyperus diversiformis weed. When the mass ratio of clomaconazole to fenfluramide was between 1:6 and 6:1, the E-E0 ratio was greater than 10%, demonstrating a synergistic effect. The synergistic effect was most pronounced when the mass ratio of clomaconazole to fenfluramide was 3:1.

[0093] Table 7 Results of indoor biological activity test on the combination of isoxadiazole and bispyribac-sodium on Alopecurus australis

[0094]

[0095]

[0096] The indoor test results in Table 7 show that combining clomaconazole with bispyribac-sodium at an appropriate mass ratio demonstrated excellent control effectiveness against the grass weed Alopecurus macrostachya. The mass ratio of clomaconazole to bispyribac-sodium ranged from 1:6 to 12:1, with an E-to-E0 ratio greater than 10%, demonstrating a synergistic effect. The synergistic effect was most pronounced at a mass ratio of 6:1.

[0097] Table 8 Results of the indoor biological activity test of isoxadiazole-methyl and bispyribac-sodium on schizonepeta tenuifolia

[0098]

[0099] The indoor test results in Table 8 show that combining clomaconazole and bispyribac-sodium at an appropriate mass ratio has a good control effect on the broadleaf weed Achyranthes chinensis. When the mass ratio of clomaconazole to bispyribac-sodium was 1:6 to 12:1, the E-E0 was greater than -10%, indicating an additive or synergistic effect. When the mass ratio of clomaconazole to bispyribac-sodium was 1:6 to 9:1, the E-E0 was greater than 10%, indicating a synergistic effect. The synergistic effect was most significant when the mass ratio of clomaconazole to bispyribac-sodium was 3:1.

[0100] Table 9 Results of indoor biological activity test of isoxadiazole and bispyribac-sodium on Cyperus angustifolia

[0101]

[0102]

[0103] The indoor test results in Table 9 show that combining clomaconazole with bispyribac-sodium at an appropriate mass ratio has a good control effect on the Cyperaceae weed Cyperus sieboldii. When the mass ratio of clomaconazole to bispyribac-sodium is between 1:6 and 12:1, the E-E0 is greater than -10%, indicating an additive or synergistic effect. When the mass ratio of clomaconazole to bispyribac-sodium is between 1:6 and 9:1, the E-E0 is greater than 10%, indicating a synergistic effect. The synergistic effect is most pronounced when the mass ratio of clomaconazole to bispyribac-sodium is 1:3.

[0104] Example 2: Field efficacy test

[0105] Test basis: The test was conducted in accordance with GB / T 17980.40-2000 Guidelines for Field Efficacy Tests of Pesticides (I) Herbicides for Control of Weeds in Rice Fields.

[0106] The test was conducted in Wangtaiping Village, Taiping Street, Hedong District, Linyi City, Shandong Province. The test site was flat, with uniform fertility, an organic matter content of 1.17%, a pH value of 6.8, and the previous crop was wheat.

[0107] Experimental crops: The rice variety is Xudao No. 9, which is in good growth condition.

[0108] Test targets: Common annual weeds in rice fields.

[0109] Test Method: Applications were conducted in mid-July, when rice was at the 4-5 leaf stage and weeds were at the 2-4 leaf stage. Field water was drained one day before application and returned one day after application, maintaining a 3-5 cm water layer for approximately 7 days. Applications were made using a HD-400 backpack sprayer manufactured by Singapore Linong Pte Ltd, with a single fan nozzle and a pressure of 1 kgf / cm². 2 , spray volume 600L / hm 2 All treatments were repeated 4 times, with a plot area of ​​20 m 2 Each plot has a ridge and separate irrigation and drainage, and is arranged in random block groups.

[0110] After the application of the drug, the weeds and rice were observed and recorded from time to time for symptoms such as growth inhibition, chlorosis, deformity, etc. 4 points were randomly surveyed in each plot 14 days and 28 days after the application, with an area of ​​0.25 m2 at each point. 2 The number of weeds was investigated 14 days after application, and the number of weeds and their fresh weight were investigated 28 days after application. The control effect was calculated according to the following formula:

[0111]

[0112] Field efficacy test results:

[0113] Table 10 Control effect of weeds in each treatment 14 days after application

[0114]

[0115] Table 11 Control effect of weeds in each treatment 28 days after application

[0116]

[0117] Fourteen days after application, the total weed control efficacy of the herbicidal composition of the present invention in the treatment groups was 86.21% to 92.81% (see Table 10). Twenty-eight days after application, the total weed control efficacy of the herbicidal composition of the present invention in the treatment groups was 84.74% to 91.77% and the total weed control efficacy by fresh weight was 86.61% to 96.20%, respectively (see Table 11), significantly higher than that of the other treatment groups.

[0118] After transplanting rice, irregular observations were conducted and no damage was found to the rice by any of the treatment agents. The rice seedlings grew normally and showed no significant difference from the seedlings in the control area, indicating that the treatment agents were safe for rice growth at the dosage used in this experiment.

[0119] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any changes or modifications made based on the essence of the present invention in one or more aspects shall be included in the scope of protection of the present invention.

Claims

1. A herbicidal composition, characterized in that The herbicidal composition comprises active ingredient A and active ingredient B, wherein the active ingredient A is isoxaproyl or isoxaproyl methyl ester, and the active ingredient B is any one of pyrifos-butyl, pyrifos-butyl or bispyribac-butyl; the mass ratio of the active ingredient A to the active ingredient B is 1:6 to 12:

1.

2. The herbicidal composition according to claim 1, characterized in that The mass ratio of isoxadiazole to pyrifos-butyl is 1:5 to 9:1; The mass ratio of clofamid methyl to pyrifos-butyl is 1:6 to 6:1; The mass ratio of isoxadiazole to saflufenacil is 1:6 to 6:1; The mass ratio of clofamid methyl to saflufenacil is 1:5 to 6:1; The mass ratio of isoxadiazole to bispyribac is 1:6 to 12:1; The mass ratio of the isoxadiazine methyl to bispyribac-sodium is 1:6 to 9:

1.

3. The herbicidal composition according to claim 2, characterized in that The mass ratio of isoxadiazole to pyrifos-butyl is 1:4 to 9:1; The mass ratio of clofamid methyl to pyrifos-butyl is 1:4 to 6:1; The mass ratio of isoxadiazole to saflufenacil is 1:5 to 9:2; The mass ratio of clofamid methyl to saflufenacil is 1:5 to 6:1; The mass ratio of isoxadiazole to bispyribac is 1:6 to 9:1; The mass ratio of the isoxadiazine methyl to bispyribac-sodium is 1:6 to 6:

1.

4. The herbicidal composition according to claim 1, characterized in that Based on 100 wt % of the herbicidal composition, the active ingredient A and the active ingredient B account for 1% to 80% of the total weight of the herbicidal composition.

5. The herbicidal composition according to claim 1, characterized in that The herbicidal composition contains other auxiliary ingredients in addition to the active ingredients, and the auxiliary ingredients are selected from one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoaming agents, solvents, preservatives, stabilizers, synergists or carriers.

6. The herbicidal composition according to claim 1, characterized in that The herbicidal composition can be prepared in the form of a liquid preparation or a solid preparation.

7. The herbicidal composition according to claim 6, characterized in that The liquid preparations are suspensions, emulsifiable concentrates, dispersible oil suspensions, microemulsions, and aqueous emulsions; the solid preparations are wettable powders, granules, and water-dispersible granules.

8. Use of the herbicidal composition according to any one of claims 1 to 7 for controlling weeds in rice fields.

9. The use according to claim 8, characterized in that The weeds are annual weeds, and the weeds are grass weeds, broadleaf weeds or sedge weeds.

10. The use according to claim 9, characterized in that The grass weeds are barnyard grass, rice clover, chinensis, alopecuroides, crabgrass, and goosegrass; the broad-leaved weeds are schizonepeta, raindrops, knotweed, duckweed, dwarf sagittaria, polygonum multiflorum, and pondweed; the sedge weeds are cyperus dimorphus, cyperus cardia, and cyperus rotundus.

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