A soil closing herbicide for sesame field comprising monosulfuron and oxadiargyl

Abstract

The application discloses a sesame field soil closing herbicide containing monosulfuron and oxadiargyl, and belongs to the technical field of pesticides. The effective component of the herbicide is monosulfuron and oxadiargyl; the mass ratio of the monosulfuron and the oxadiargyl is 1:20-1:60. The herbicide is high in safety to sesame and free from drug damage; the synergistic effect of the monosulfuron and the oxadiargyl after compounding is obvious; the herbicidal combination has a significant combined synergistic effect on common weeds in sesame fields; and the herbicidal combination expands the herbicidal spectrum and has excellent prevention and removal effects on common weeds in sesame fields.

Description

Technical Field

[0001] This invention relates to the field of pesticide technology, specifically to a soil-sealing herbicide for sesame fields containing pyrimisulfuron and acetamiprid. Background Technology

[0002] Sesame( Indian sesame Sesame (L.) is an annual herbaceous crop belonging to the genus *Sesamum* of the family Pedaliaceae. It is an important specialty oilseed crop in my country and also the herbaceous plant with the highest oil content. Sesame is rich in nutrients, including fatty acids, protein, dietary fiber, polysaccharides, minerals, and various vitamins. It is also rich in natural antioxidant active ingredients such as sesamin, sesaminol, and sesamol, and is widely used in food processing, fine chemicals, health care, and pharmaceutical manufacturing. However, weed infestation in sesame fields can severely affect sesame yield and quality. Studies have shown that improper weed control can lead to yield losses of 30%-80%, or even total crop failure. Currently, global research on sesame is largely limited to variety selection and related cultivation techniques, but research on weed control techniques in sesame fields is severely lacking.

[0003] Monosulfuron, chemically known as 2-nitro-N-[2-(4-methylpyrimidinyl)]benzenesulfonylurea, belongs to the sulfonylurea class of herbicides. It is a highly selective, systemic herbicide applied to foliar and soil surfaces. Its mechanism of action involves inhibiting acetyllactate synthase (ALS) in plants, hindering the biosynthesis of side-chain amino acids such as valine, leucine, and isoleucine. Cell division is inhibited, and the cell cycle arrests at the G1 and G2 stages, disrupting normal weed growth and causing death. It has good control effects on most broadleaf weeds. Currently, it is mainly used in millet and wheat fields to control annual broadleaf weeds such as lambsquarters, knotweed, amaranth, purslane, thistle, shepherd's purse, and capernaum. No research reports have been found on the control of weeds in sesame fields using monosulfuron.

[0004] The chemical name of acetamiprid is N-(1,1-dimethylpropyne)-3,5-dichloro-benzamide. It belongs to the amide class of herbicides and is a highly active soil-applied herbicide. Its mechanism of action is through root absorption and translocation, interfering with the mitosis of weed cells and thus controlling weed emergence. It is effective in controlling monocotyledonous and some small-seed broadleaf weeds and is safe for broadleaf crops. Currently, it is mainly used in lettuce and ginger fields to control annual weeds such as crabgrass, alopecuroides, Kentucky bluegrass, goosegrass, chickweed, and lambsquarters. No research reports have been found on the control of weeds in sesame fields using acetamiprid.

[0005] Chemical weeding offers advantages such as rapid onset, high efficacy, time and labor savings, effectively reducing weed damage and ensuring crop yield. However, sesame is highly sensitive to most herbicides, especially those controlling broadleaf weeds. Furthermore, herbicides registered for other crops can easily cause phytotoxicity to sesame, leading to decreased yield and quality. According to data from the China Pesticide Information Network, currently only six sesame-specific herbicides with two active ingredients, S-metolachlor and S-quizalofop-P-ethyl, are registered for production. This lack of herbicide products and sensitivity to herbicides severely restricts the industrialization and large-scale development of the sesame industry. Therefore, research on chemical weed control in sesame fields is urgently needed. Providing a safe and reliable herbicide for sesame, with good weed control, low cost, and easy-to-use application is a pressing production challenge for sesame cultivation.

[0006] There are currently no reports of herbicidal compositions containing pyrimisulfuron and acetamiprid, and even fewer research reports on the application of pyrimisulfuron and acetamiprid in weed control in sesame fields. Summary of the Invention

[0007] The purpose of this invention is to provide a soil-applied herbicide for sesame fields containing pyrimisulfuron and acetamiprid. This herbicide achieves safe and efficient post-emergence weed control in sesame fields.

[0008] The present invention first provides a herbicide whose active ingredients are pyrimisulfuron and acetamiprid.

[0009] In the above-mentioned herbicides, the mass ratio of pyrimethanil to acetamiprid is 1:20 to 1:60; specifically, it can be 1:20 to 1:50; more specifically, it can be 1:20, 1:22.5, 1:25, 1.5:40, 1:30, 1.5:50, 1:40, 1:45 or 1:50.

[0010] Specifically, the herbicide is used in sesame fields.

[0011] The herbicides mentioned above are wettable powders, water-dispersible granules, or suspensions.

[0012] When the herbicide is a water-dispersible granule, the herbicide further includes a wetting agent, a dispersant, a disintegrant, a binder, a stabilizer, an antifoaming agent, and diatomaceous earth; specifically, the wetting agent is sodium dodecyl sulfate; the dispersant is phenethylphenol polyoxyethylene ether; the binder is sodium carboxymethyl cellulose; the disintegrant is anhydrous sodium sulfate; the stabilizer is magnesium stearate; and the antifoaming agent is organosilicon.

[0013] When the herbicide is a wettable powder, the herbicide further includes a wetting agent, a dispersant, an antifoaming agent, and diatomaceous earth; specifically, the wetting agent is sodium dodecylbenzene sulfonate; the dispersant is sodium lignosulfonate; and the antifoaming agent is organosilicon.

[0014] When the herbicide is a suspension concentrate, the herbicide further includes a dispersant, a thickening and suspension stabilizer, an antifreeze agent, a cosolvent, an antifoaming agent, and a dispersion medium; specifically, the dispersant is an alkylphenol polyoxyethylene ether; the thickening and suspension stabilizer is magnesium aluminum silicate; the antifreeze agent is glycerol; the cosolvent is N-methylpyrrolidone; the antifoaming agent is organosilicon; and the dispersion medium is deionized water.

[0015] In the above-mentioned herbicides, the mass of pyrimisulfuron and acetamiprid accounts for 50% to 80% of the total mass of the herbicides.

[0016] Secondly, the present invention provides the application of the above-mentioned herbicide in the control of field weeds.

[0017] The above-mentioned application includes the use of the herbicide in controlling weeds in sesame fields.

[0018] The weeds are at least one of the following: crabgrass, foxtail grass, cocklebur, and velvetleaf.

[0019] Finally, the present invention provides a method for controlling weeds in sesame fields, comprising the following steps: Dilute the herbicide with water and then spray it on the field after sesame sowing but before seedling emergence.

[0020] The present invention has the following beneficial effects: 1) The herbicide of the present invention has high safety for sesame and causes no phytotoxicity; 2) The combination of pyrimisulfuron and acetamiprid has a significant synergistic effect on common weeds in sesame fields; 3) The herbicide of the present invention has a broadened spectrum of weed control and has excellent control effects on common weeds in sesame fields; 4) The herbicide of the present invention has low control costs and is easy to promote and use. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to specific embodiments. The embodiments given are only for illustrating the present invention and are not intended to limit the scope of the present invention.

[0022] Unless otherwise specified, the experimental methods described in the following examples are conventional methods.

[0023] Unless otherwise specified, the quantitative experiments in the following examples are all repeated three times, and the results are averaged.

[0024] Unless otherwise specified, all materials and reagents used in the following examples are commercially available.

[0025] The test reagents used in the following examples are commercially available 98wt% acetamiprid technical and 90wt% sulfadiazine technical.

[0026] Example 1: Indoor efficacy test 1. Experimental Objective The combined effect of pyrimisulfuron and acetamiprid was determined through indoor bioassay experiments.

[0027] 2. Materials and Methods The indoor efficacy test was conducted in the artificial light culture room of the Institute of Grain and Oil Crops, Hebei Academy of Agricultural and Forestry Sciences, according to the Gowing method in "NY / T1155.7-2006 Guidelines for Indoor Bioassay of Pesticides - Herbicides - Part 7: Determination of Combined Effects of Mixtures".

[0028] Target weeds selected: Crataegus pinnatifida in sesame fields of Hebei Province Bloody fingernail L.), foxtail grass ( Green setaria L.), cocklebur ( Xanthium strumarium L.), Abutilon ( Abutilon theophrasti Medikus, with germination rates all greater than 90%.

[0029] The test reagents were commercially available 98wt% acetamiprid technical grade and 90wt% monosulfuron technical grade.

[0030] Sow the seeds of the above four types of weeds evenly in plastic flower pots with a diameter of 15 cm, then cover them with about 2-3 cm of soil, place them in a plastic tray filled with water, and let the water seep in gradually. Replenish the water every 3 days by drip irrigation from the bottom of the flower pot to maintain soil moisture. When the weeds grow to 2 leaves, thin them out, leaving 13 weeds in each pot.

[0031] The technical grade pesticide was accurately weighed using an electronic balance with a mass fraction of 0.01%. 1 mL of N-methylpyrrolidone was added to the technical grade pesticide until it was completely dissolved. Finally, the volume was adjusted with a 0.1% Tween 80 aqueous solution. When the above four weeds grew to the 3-4 leaf stage, the stems and leaves of the weeds were sprayed using a 3WP-2000 mobile spray tower. Each treatment was repeated 4 times.

[0032] The synergistic effect of the mixture was evaluated using the Gowing method. The fresh weight of the aboveground parts of the weeds was measured 21 days after application. E (actual control efficacy%) was calculated as follows: E = (fresh weight of blank control - fresh weight of treated control) × 100% ÷ fresh weight of blank control; E0 (theoretical control efficacy%) was calculated as: E1 + E2 × (100 - E1) ÷ 100, where E1 and E2 are the actual control efficacies of pyrimethanil and acetamiprid at corresponding doses, respectively. When E - E0 < -10%, the components of the composition exhibited antagonistic effects; when -10% ≤ E - E0 ≤ 10%, the components exhibited additive effects; and when E - E0 > 10%, the components exhibited synergistic effects.

[0033] Table 1. Dosage table for in vitro combined action determination of pyrimisulfuron and acetamiprid (g / hm) 2 )

[0034] The experimental results (Table 1) show that, at the given dosage, acetamiprid showed control efficacy of 38.3%-52.3% against barnyardgrass, 31.6%-46.4% against foxtail grass, 10.5%-24.3% against cocklebur, and 16.6%-40.5% against velvetleaf. At the given dosage, pyrimethanil showed control efficacy of 5.3%-8.5% against barnyardgrass, 6.1%-9.7% against foxtail grass, 30.6%-51.5% against cocklebur, and 33.5%-55.7% against velvetleaf.

[0035] The combination of pyrimisulfuron and acetamiprid at a certain ratio significantly improved the control efficacy against four weeds. The combined effect test results (Table 1) showed that the actual control efficacy of pyrimisulfuron and acetamiprid against barnyardgrass, foxtail, cocklebur, and velvetleaf reached 52.5%-70.5%, 45.4%-68.4%, 48.6%-80.1%, and 56.1%-93.6%, respectively. This significantly improved the combined efficacy of pyrimisulfuron and acetamiprid against these four weeds, and also showed good control effects against less sensitive weeds, broadening the weed control spectrum. The combined effect was greater than 10%, indicating a synergistic effect. In summary, the combined effect of pyrimisulfuron and acetamiprid at a certain ratio (1:20-1:50) on weeds showed a synergistic effect.

[0036] Example 2: 50% pyrimisulfuron-methyl·propargyl sulfadiazine suspension concentrate (1:20) In this embodiment of the herbicide, the mass percentage of each component is as follows: 2.4% pyrimisulfuron, 47.6% acetamiprid, 4.2% alkylphenol polyoxyethylene ether (dispersant), 2.5% N-methylpyrrolidone (cosolvent), 3.5% glycerol (antifreeze agent), 1.7% magnesium aluminum silicate (thickening and stabilizing agent), 0.3% organosilicon (defoamer), and deionized water to make up to 100%.

[0037] The preparation steps are as follows: First, take a portion of deionized water and mix it with glycerol and N-methylpyrrolidone. Then, add magnesium aluminum silicate and stir at high speed (2000 r / min) to fully hydrate it. Next, add alkylphenol polyoxyethylene ether, monosulfuron technical, acetamiprid technical, and organosilicon defoamer for high-speed pre-dispersion pulping. The pulp is then transferred to a horizontal sand mill for circulating grinding until the particle size (D) is reached. 90 If the sample size is ≤5 μm, add the remaining deionized water and stir until well mixed to obtain the finished suspension.

[0038] Example 3: 55% pyrimisulfuron-methyl·propargyl sulfadiazine suspension (1:25) In this embodiment, the herbicide contains the following components by mass percentage: 2.1% pyrimisulfuron, 52.9% acetamiprid, 4.8% alkylphenol polyoxyethylene ether (dispersant), 2.7% N-methylpyrrolidone (cosolvent), 3.6% glycerol (antifreeze agent), 1.8% magnesium aluminum silicate (thickening and stabilizing agent), 0.3% organosilicon (defoamer), and deionized water to bring the total to 100%.

[0039] The preparation method is the same as in Example 2.

[0040] Example 4: 60% pyrimisulfuron-methyl·propargyl oxychloride wettable powder (1:30) In this embodiment, the mass percentage of each component in the herbicide is as follows: 1.9% pyrimisulfuron, 58.1% acetamiprid, 3.5% sodium dodecylbenzenesulfonate (wetting agent), 6.0% sodium lignosulfonate (dispersant), 0.5% organosilicon (defoamer), and diatomaceous earth to make up to 100%.

[0041] The preparation steps are as follows: weigh the technical grade of pyrimisulfuron, acetamiprid technical grade, sodium dodecylbenzenesulfonate, sodium lignosulfonate, organosilicon and diatomaceous earth, put them into a mixing equipment for coarse premixing, process the mixture by ultrafine grinding, and then mix the pulverized powder a second time to obtain the finished wettable powder.

[0042] Example 5: 65% pyrimisulfuron-methyl·propargyl oxychloride wettable powder (1:35) In this embodiment, the herbicide contains the following components by mass percentage: 1.8% pyrimisulfuron, 63.2% acetamiprid, 3.5% sodium dodecylbenzenesulfonate (wetting agent), 6.2% sodium lignosulfonate (dispersant), 0.5% organosilicon (defoamer), and diatomaceous earth to make up to 100%.

[0043] Its preparation method is the same as that in Example 4.

[0044] Example 6: 70% pyrimisulfuron-methyl·propargyl acetamiprid wettable powder (1:40) In this embodiment, the mass percentage of each component in the herbicide is as follows: 1.7% pyrimisulfuron, 68.3% acetamiprid, 3.5% sodium dodecylbenzenesulfonate (wetting agent), 6.3% sodium lignosulfonate (dispersant), 0.5% organosilicon (defoamer), and diatomaceous earth to make up to 100%.

[0045] Its preparation method is the same as that in Example 4.

[0046] Example 7: 75% pyrimisulfuron-methyl·propargyl oxychloride water-dispersible granules (1:45) In this embodiment, the herbicide contains the following components by mass percentage: 1.6% pyrimisulfuron, 73.4% acetamiprid, 1.6% sodium dodecyl sulfate (wetting agent), 5.5% phenethylphenol polyoxyethylene ether (dispersant), 0.8% sodium carboxymethyl cellulose (binder), 5.2% anhydrous sodium sulfate (disintegrant), 0.4% magnesium stearate (stabilizer), 0.3% organosilicon (defoamer), and kaolin to make up to 100%.

[0047] The preparation steps are as follows: Weigh out the technical grade of pyrimisulfuron, acetamiprid technical grade, sodium dodecyl sulfate, phenethylphenol polyoxyethylene ether, sodium carboxymethyl cellulose, anhydrous sodium sulfate, magnesium stearate, and kaolin solid raw materials according to the formula ratio, put them into a mixer and mix them evenly, then pulverize them by air jet milling to D. 95 For particles ≤20 μm, the silicone defoamer is mixed into clean water at a ratio of 17%-21% of the total weight of the powder. The powder is added in portions and kneaded into a plastic soft material. The material is then extruded and granulated through a 1.0 mm sieve. The resulting particles are dried in a fluidized bed at 45-55℃ until the moisture content is ≤3.0%. Finally, the particles are sieved through a 20-60 mesh screen, and the qualified particles are packaged separately. The fine powder under the sieve is reused.

[0048] Example 8: 80% pyrimisulfuron-methyl·propargyl oxychloride water-dispersible granules (1:50) In this embodiment, the herbicide contains the following components by mass percentage: 1.6% pyrimisulfuron, 78.4% acetamiprid, 1.6% sodium dodecyl sulfate (wetting agent), 5.8% phenethylphenol polyoxyethylene ether (dispersant), 0.8% sodium carboxymethyl cellulose (binder), 4.5% anhydrous sodium sulfate (disintegrant), 0.4% magnesium stearate (stabilizer), 0.3% organosilicon defoamer, and kaolin to make up to 100%.

[0049] The preparation method is the same as in Example 7.

[0050] Example 9: Herbicide and Safety Test of Monosulfuron-methyl·Alkyl Acetate in Sesame Fields The herbicides prepared in Examples 2-8 were used in this experiment. The control agents were 10wt% pyrimethanil wettable powder (Hebei Xingbai Kangwei Technology Co., Ltd.) and 80wt% acetamiprid water-dispersible granules (Anhui Fengle Agricultural Chemical Co., Ltd.). The sesame variety was "Jihangzhi No. 2". The test site was Kangzhuang Village, Guantao County, Hebei Province.

[0051] Before planting sesame, clean the land thoroughly, plow and harrow to a depth of 20 cm, and refine and level the soil to retain moisture. Sow sesame in rows at a depth of 2 cm, with a row spacing of 40 cm and a plant spacing of 15 cm, at a seeding rate of 0.4 kg / mu. Apply 50 kg of bio-organic fertilizer per mu before planting. Coat seeds with 25% thiamethoxam·cypermethrin·cymoxanil suspension seed dressing agent (Syngenta Nantong Crop Protection Co., Ltd.). During the growing season, use 3.2% high-chlorpyrifos·emamectin benzoate microemulsion (Hainan Zhengye Biotechnology Co., Ltd.) + 24% chlorfenapyr·chlorantraniliprole suspension (Hebei Meibang Chemical Technology Co., Ltd.) to control major pests such as cutworms, beet armyworms, and cotton bollworms. Simultaneously, use 35% benzoyl peroxide·pyraclostrobin suspension (Shandong Hailier Chemical Co., Ltd.) or 30% benzoyl peroxide·propiconazole emulsifiable concentrate (Qingdao Binhai Taisheng Crop Science Co., Ltd.) to control diseases such as stem blight and wilt.

[0052] The field trial was conducted after sesame sowing but before emergence. The spraying rate was 45 L / mu (approximately 0.067 hectares). The spraying equipment was an HD400 backpack sprayer manufactured by Singapore Linong Pte Ltd, with a fan-shaped nozzle. Five treatments were applied in the sesame field, plus a blank control and manual weeding. Each treatment area was 20 m². 2 The treatments were repeated three times, with randomized block arrangements. The drugs and dosages for each treatment are shown in Table 2.

[0053] 42 days after drug administration, 1 m was measured for each treatment. 2 The fresh weight of the aboveground parts of the weeds was used to calculate the efficacy of the herbicide against the fresh weight of the weeds. The formula was: Fresh weight efficacy against weeds (%) = (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.

[0054] Sesame yield is measured in plots during harvest.

[0055] Table 2. Herbicidal effect of herbicides

[0056] The experimental results showed that the effective concentrations of 50% pyrimisulfuron-methyl·propargyl chlorpyrifos suspension concentrate, 55% pyrimisulfuron-methyl·propargyl chlorpyrifos suspension concentrate, 60% pyrimisulfuron-methyl·propargyl chlorpyrifos wettable powder, 65% pyrimisulfuron-methyl·propargyl chlorpyrifos wettable powder, 70% pyrimisulfuron-methyl·propargyl chlorpyrifos wettable powder, 75% pyrimisulfuron-methyl·propargyl chlorpyrifos water-dispersible granules, and 80% pyrimisulfuron-methyl·propargyl chlorpyrifos water-dispersible granules (Examples 2-8) were 750 g / hm². 2 The treatment showed excellent control of weeds in sesame fields. 42 days after application, the overall fresh weight control efficacy against weeds was above 90%, which was significantly higher than that of monosulfuron (43.7%) and acetamiprid (75.8%) alone.

[0057] Table 3 Effects of herbicides on sesame yield

[0058] After treatment with the herbicide of the present invention, the sesame plants grew normally and showed no signs of phytotoxicity. The yield at harvest (Table 3) showed that the sesame plants were significantly better than the control herbicide and the blank control treatment, and there was no significant difference from the manual weeding treatment.

Claims

1. A herbicide whose active ingredients are pyrimisulfuron and acetamiprid.

2. The herbicide according to claim 1, characterized in that: The mass ratio of pyrimethanil to acetylenesulfuron is 1:20 to 1:

60.

3. The herbicide according to claim 2, characterized in that: The mass ratio of pyrimisulfuron to acetylenesulfuron is 1:20 to 1:

50.

4. The herbicide according to any one of claims 1 to 3, characterized in that: The herbicide was used in sesame fields.

5. The herbicide according to any one of claims 1 to 4, characterized in that: The herbicide is a wettable powder, water-dispersible granule, or suspension concentrate.

6. The herbicide according to claim 5, characterized in that: The mass of pyrimethanil and acetamiprid accounts for 50% to 80% of the total mass of the herbicide.

7. The application of the herbicide according to any one of claims 1 to 6 in the control of field weeds.

8. The application according to claim 7, characterized in that: The herbicide is used to control weeds in sesame fields.

9. The application according to claim 7 or 8, characterized in that: The weeds are at least one of the following: crabgrass, foxtail grass, cocklebur, and velvetleaf.

10. A method for controlling weeds in sesame fields, comprising the following steps: Dilute the herbicide according to any one of claims 1 to 6 with water and then spray it on the field after sesame sowing but before seedling emergence.

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