Weeding composition containing oxadiazon, pyroxasulfone and isoxaflutole and application of weeding composition

Abstract

The invention provides a weeding composition containing foxacarb, pyroxasulfone and isoxaflutole. The mass ratio of the foxacarb to the pyroxasulfone to the isoxaflutole is (1-5): (1-10): (5-15). The weeding composition disclosed by the invention has a remarkable synergistic effect, can be used for remarkably improving the weeding effect of a medicament, reducing the dosage of the medicament, slowing down the generation of pesticide resistance and relieving environmental pollution, can be used for preventing and removing annual weeds of corn, and has an excellent weeding effect.

Description

Technical Field

[0001] This invention belongs to the field of herbicides, specifically relating to a herbicidal composition comprising benzoxam, sulfopyrazol and isoxam and its application. Background Technology

[0002] Benoxipyrone, a derivative of benzoxopyrone, exhibits significantly better control efficacy against broadleaf weeds such as lambsquarters, amaranth, field bindweed, retroflexus, dayflower, thistle, and eclipta prostrata than benzoxopyrone, with an efficacy approximately twice that of benzoxopyrone. Its control efficacy against purslane is also significantly better than benzoxopyrone, with an efficacy approximately 3.8 times that of benzoxopyrone. Its control efficacy against velvetleaf is comparable to that of benzoxopyrone. The development of benzoxipyrone has solved the problems of benzoxopyrone's poor efficacy against sedges, poor sustained control of broadleaf weeds, and poor tolerance to washout. The chemical structure of benzoxipyrone is as follows: The patent document CN202311455118.9 has been published.

[0003] Sulfonazole belongs to the isoxazole class of herbicides. It can specifically inhibit many elongation steps catalyzed by VLCFA elongase. It is mainly absorbed by plants through young shoots and roots, and can also be absorbed by tender stems and leaves, thereby blocking the growth of apical meristem and coleoptile.

[0004] Isoxazolium is a triazine selective systemic herbicide. It is mainly absorbed through the roots, but can also be absorbed by the buds and stems and leaves, and transported to the green leaves to inhibit photosynthesis. It is used to control a variety of annual weeds in corn fields.

[0005] Long-term use of herbicides alone can easily lead to the development of herbicide resistance in weeds and cause environmental pollution. Therefore, finding synergistic combinations that can improve herbicidal efficacy and reduce the dosage of active ingredients is a key research focus for many pesticide companies in China. Currently, there are no records of combining benzoxam, sulfopyrazosulfuron, and isoxaflutole in existing technologies. Summary of the Invention

[0006] This invention provides a herbicidal composition containing benzoxam and its application. The herbicidal composition of this invention has a significant synergistic effect. The specific technical solution is as follows: A herbicidal composition comprising benzoxaprazole, wherein the active ingredients comprise benzoxaprazole, sulfoprazole and isoxaprazole, wherein the mass ratio of benzoxaprazole, sulfoprazole and isoxaprazole is (1-5):(1-10):(5-15); preferably 1:(1-5):(6-12).

[0007] More preferably, the mass ratio of benzoxaprazole, sulfonylpyrazole and isoxaflutole is 1:5:(6-8); even more preferably, the mass ratio of benzoxaprazole, sulfonylpyrazole and isoxaflutole is 1:5:6 or the mass ratio of benzoxaprazole, sulfonylpyrazole and isoxaflutole is 1:5:8.

[0008] The herbicidal composition of the present invention is mixed with pesticide excipients to prepare any formulation suitable for agricultural use; the total mass percentage of active ingredients is 1-75%.

[0009] The formulations described in this invention are suspensions, dispersible oil suspensions, emulsifiable concentrates, suspension emulsions, water-dispersible granules, and wettable powders.

[0010] The herbicidal composition of the present invention is used for controlling corn weeds, especially annual weeds such as barnyard grass, crabgrass, foxtail grass, and wild millet.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The herbicidal composition of this invention has a significant synergistic effect, which can significantly improve the herbicidal effect of the herbicide, reduce the dosage of the herbicide, slow down the development of pesticide resistance, and reduce environmental pollution. The herbicidal composition of this invention can be used for the control of annual weeds in corn and has excellent herbicidal effect. Detailed Implementation The present invention can be better understood from the following embodiments. However, those skilled in the art will readily understand that the descriptions in the embodiments are for illustrative purposes only and should not, and will not, limit the invention as detailed in the claims.

[0012] Example 1: Indoor bioassay of herbicide composition against the grassy weed, crabgrass. The tested weed was crabgrass. Mature seeds were collected from the field and cultured and preserved in the laboratory.

[0013] Test reagents: benzoxadiazon, sulfopyrazol, isoxadiazon, and atrazine.

[0014] Experimental Method: A greenhouse pot method was used. The experimental soil was specially collected from untreated plots. The experimental soil was filled into flowerpots; the flowerpots were placed in a basin of water, and the soil was kept moist by bottom irrigation. A fixed amount of crabgrass seeds were sown in the flowerpots and covered with 0.5cm of soil. 25 crabgrass plants of uniform growth were retained in each pot, and treatment was performed when they reached the 2-3 leaf stage. Foliar spraying was applied using a potter's sprayer, with each treatment replicated four times. After treatment, the plants were placed in a greenhouse for normal management, and the growth of the crabgrass was observed regularly. The fresh weight of the above-ground parts of the crabgrass was measured after 14 days, and the fresh weight inhibition rate was calculated.

[0015] The combined effect of the herbicidal compositions was evaluated. The measured fresh weight inhibition rate after compounding was denoted by E, and the theoretical fresh weight inhibition rate after compounding was denoted by E0.

[0016] When E–E0 > 10%, it has a synergistic effect; when E–E0 < -10%, it has an antagonistic effect; and when E–E0 is between -10% and 10%, it has an additive effect.

[0017] Results analysis: The ternary herbicidal composition exhibits different synergistic effects against the grassy weed, crabgrass. When the mass ratio of benzoxam, sulfonylpyrazole, and isoxaflutole is 1:5:(6-12), it shows a significant synergistic effect against crabgrass; when the mass ratio is 1:2:(3.6-7.2), it shows an additive effect. When the herbicidal composition is a synergistic composition, it can significantly improve the herbicidal effect of the herbicide, reduce the dosage required, slow down the development of pesticide resistance, and reduce environmental pollution.

[0018] Table 1. Indoor bioassay of herbicide composition against Digitaria sanguinalis.

[0019] Example 2: Indoor bioassay of herbicide composition against the grass weed *Setaria viridis* The tested weed was foxtail grass. Mature seeds were collected from the field and cultured and preserved in the laboratory.

[0020] Test reagents: benzoxadiazon, sulfopyrazol, isoxadiazon, and atrazine.

[0021] Experimental Method: A greenhouse pot method was used. The experimental soil was specially collected from untreated plots. The experimental soil was filled into flowerpots; the flowerpots were placed in a basin of water, and the soil was kept moist by bottom irrigation. A fixed amount of foxtail grass seeds was sown in the flowerpots, and then covered with 0.5cm of soil. Thirty foxtail grass plants of uniform growth were retained in each pot, and treatment was initiated when they reached the 3-4 leaf stage. Foliar spraying was performed using a potter's sprayer, with each treatment replicated four times. After treatment, the plants were placed in a greenhouse for normal management, and the growth of the foxtail grass was observed regularly. The fresh weight of the above-ground portion of the foxtail grass was weighed after 14 days, and the fresh weight inhibition rate was calculated.

[0022] The combined effect of the herbicidal compositions was evaluated. The measured fresh weight inhibition rate after compounding was denoted by E, and the theoretical fresh weight inhibition rate after compounding was denoted by E0.

[0023] When E–E0 > 10%, it has a synergistic effect; when E–E0 < -10%, it has an antagonistic effect; and when E–E0 is between -10% and 10%, it has an additive effect.

[0024] Results analysis: The ternary herbicidal composition exhibits different synergistic effects against the grassy weed *Setaria viridis*. When the mass ratio of benzoxam, sulfonylpyrazole, and isoxaflutole is 1:5:(6-8), it shows a significant synergistic effect against *Setaria viridis*; when the mass ratio is 1:2:4.8, it shows a synergistic effect; under other test ratios, it shows an additive effect. When the herbicidal composition is a synergistic composition, it can significantly improve the herbicidal effect of the herbicide, reduce the dosage of the herbicide, slow down the development of pesticide resistance, and reduce environmental pollution.

[0025] Table 2. Indoor bioassays of herbicidal compositions on foxtail grass.

[0026] Example 3: Field control efficacy of the herbicidal composition against weeds in corn fields.

[0027] Experimental crop: maize.

[0028] Field weeds: barnyard grass, crabgrass, foxtail grass, wild millet.

[0029] Test reagents: Agent 1: 24% Benoxiprin·Sulfonazole·Isoxaflubenzuron Dispersible Oil Suspension (containing the following ingredients by weight percentage: Benoxiprin 2%, Sulfonazole 10%, Isoxiprin 12%, Agricultural Emulsifier 1600 8%, Ningru 348%, Ethylan 3241%, Sodium Lauryl Sulfate 4%, Defoamer 0.5%, Ethylene Glycol 3%, Methyl Oleate 4%, and Soybean Oil to make up 100%).

[0030] Agent 2: 26% Benoxiprin·Sulfonazole·Isoxaflubenzuron Dispersible Oil Suspension (containing the following ingredients by weight percentage: Benoxiprin 2%, Sulfonazole 10%, Isoxiprin 14%, Agricultural Emulsifier 1600 7%, Ningru Emulsifier 3410%, Ethylan 3242%, Sodium Lauryl Sulfate 3%, Defoamer 0.8%, Ethylene Glycol 3%, Methyl Oleate 4%, and Soybean Oil to make up 100%).

[0031] Agent 3: 28% Benoxiprin·Sulfonazole·Isoxaflubenzuron Dispersible Oil Suspension (containing the following ingredients by weight percentage: Benoxiprin 2%, Sulfonazole 10%, Isoxiprin 16%, Agricultural Emulsifier 1600 10%, Ningru 348%, Ethylan 3243%, Sodium Lauryl Sulfate 2%, Defoamer 0.8%, Ethylene Glycol 3%, Methyl Oleate 4%, and Soybean Oil to make up 100%).

[0032] Application method: A pesticide treatment and a blank control were set up, with four replicates; each plot was 25 m², randomly arranged. Foliar spraying was used. Weed control efficacy was assessed 14 days after application, focusing on fresh weed weight.

[0033] Results analysis: Agents 1-3 have a good control effect on corn weeds; when the effective ingredient dosage is 5g / mu, the control efficacy is over 65%; it can effectively control weeds in the field.

[0034] Table 3. Control efficacy of herbicidal compositions against corn weeds

[0035] The above description is only a preferred embodiment of the present invention. For those skilled in the art, appropriate improvements can be made without departing from the original material of the present invention, and these improvements are also within the protection scope of the present invention.

Claims

1. A herbicidal composition comprising benzoxam, characterized in that, The active ingredients include benzoxaprazole, sulfoprazole and isoxaprazole, with a mass ratio of (1-5):(1-10):(5-15).

2. The herbicidal composition according to claim 1, characterized in that, The mass ratio of benzoxaprozil, sulfopyrazole and isoxaprozil is 1:(1-5):(6-12).

3. The herbicidal composition according to claim 2, characterized in that, The mass ratio of benzoxam, sulfopyrazole and isoxam is 1:5:(6-8).

4. The herbicidal composition according to claim 3, characterized in that, The mass ratio of benzoxam, sulfopyrazole and isoxam is 1:5:6 or 1:5:

8.

5. The herbicidal composition according to any one of claims 1-4, characterized in that, The herbicidal composition is mixed with pesticide excipients to prepare any formulation suitable for agricultural use.

6. The herbicidal composition according to claim 5, characterized in that, The total mass percentage of active ingredients is 1-75%.

7. The herbicidal composition according to claim 6, characterized in that, The formulation is a suspension, a dispersible oil suspension, an emulsifiable concentrate, a suspension emulsion, a water-dispersible granule, or a wettable powder.

8. Use of the herbicidal composition according to any one of claims 1-7 for controlling corn weeds.

9. The use according to claim 8, characterized in that, The weeds mentioned are annual weeds.

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