A ternary herbicidal composition containing oxasulfuron, thifensulfuron-methyl and flufenacet

Abstract

The present invention provides a ternary herbicidal composition containing pyroxasulfone, thifensulfuron-methyl and flufenacet, comprising active ingredients in the following mass ratio: the mass ratio of pyroxasulfone, thifensulfuron-methyl and flufenacet is 1-10:0.1-10:1-50. The herbicidal composition of the present invention can be used to control gramineous weeds, broad-leaved weeds and sedges in wheat fields. The herbicidal composition of the present invention has a significant synergistic effect and can broaden the herbicidal spectrum, solving various weed problems with a single application and making up for the defects and limitations of single-agent use.

Description

Technical Field

[0001] The present invention relates to the field of pesticides, and in particular to a ternary herbicidal composition containing pyroxasulfone, thifensulfuron-methyl and flufenacet and its application. Background Art

[0002] China is the world's largest wheat producer and consumer, with a production accounting for about 18% of the global total. Field weeds are one of the important factors affecting wheat yield and quality, competing with crops for light, water, fertilizer and space. Relevant data shows that in normal control years, weed damage can cause a wheat yield reduction of about 15%, and in severely affected fields, the yield reduction can exceed 50%. At present, the simplest and most effective method for weed control in wheat fields is chemical weeding. However, due to the lack of scientific guidance on pesticide application and the continuous use of the same type of herbicides year after year, problems such as poor weeding effect and high control cost have become increasingly serious, which is not conducive to the sustainable development of the agricultural ecological environment. In order to effectively control weeds in wheat fields, currently, only by increasing the dosage of pesticides can chemical control be achieved, which has led to the continuous enhancement of weed resistance, and even the development of cross-resistance and multiple resistances, increasing the pesticide cost and violating the concept of green control. To solve the problem of enhanced resistance of herbicide single agents, researchers have carried out development research from the perspective of compound synergistic herbicidal compositions.

[0003] Pyroxasulfone belongs to a new type of isoxazole herbicide, which is mainly absorbed by plants through young buds and young roots. After plant germination, it blocks the growth of the apical meristem and coleoptile. For pre-emergence soil closed spraying treatment in wheat fields, it has good safety, a relatively long residual period and a wide herbicidal spectrum, and can effectively control various common weeds such as Bromus japonicus, Alopecurus myosuroides, Descurainia sophia, Capsella bursa-pastoris, etc. in dryland winter wheat fields.

[0004] Thifensulfuron-methyl is a selective systemic sulfonylurea herbicide. After application, it is absorbed by weeds and rapidly conducts in the body, blocking cell division and causing weeds to stop growing and gradually die, and has a killing effect on various annual broad-leaved weeds in wheat fields and soybean fields. It mainly controls annual broad-leaved weeds such as Abutilon theophrasti, Allium vineale, Convolvulus chinensis, Amaranthus retroflexus, Chenopodium album, Commelina communis, Sonchus arvensis, Cirsium setosum, Equisetum arvense, Galium aparine, Polygonum lapathifolium, Salsola collina, Solanum nigrum, Veronica didyma, etc.

[0005] Flufenacet belongs to aryloxyacetamide compounds, a cell division and growth inhibitor, and a selective herbicide. It can effectively control annual weeds such as Setaria viridis, Echinochloa crusgalli, Digitaria sanguinalis in corn fields, and annual weeds such as Beckmannia syzigachne, Alopecurus aequalis, Alopecurus japonicus, Sclerochloa dura in winter wheat fields, and also has a certain inhibitory effect on broad-leaved weeds.

[0006] Shandong Zhongshi Pharmaceutical Co., Ltd. CN115715546A discloses a herbicidal composition containing thifensulfuron-methyl, which is characterized by consisting of the following raw materials in parts by weight: 12-18 parts of pyroxasulfone technical, 22-28 parts of thifensulfuron-methyl technical, 5-9 parts of disintegrant, 2-4 parts of wetting agent, 4-8 parts of dispersant, 1-3 parts of chelating agent, 1-5 parts of modified adsorption component, 6-10 parts of activity inhibition component. The modified adsorption component includes silica white, hydrophobic cellulose and starch binder, and the weight ratio of silica white, hydrophobic cellulose and starch binder is (1-3):(1-3):1, and kaolin is supplemented to 100 parts. Whether there is a synergistic effect between the active ingredients is not disclosed in this patent document.

[0007] Jiangsu Longdeng Chemical Co., Ltd. CN108697084A discloses a synergistic herbicidal composition, which contains pyroxasulfone and methyl thifensulfuron as active ingredients, and the weight ratio of pyroxasulfone to methyl thifensulfuron is 50:1 to 1:50; what is disclosed in this patent document is a binary herbicidal combination, and there are differences in the active ingredients.

[0008] The Institute of Cereal and Oil Crops, Hebei Academy of Agriculture and Forestry Sciences CN105594712A discloses a herbicidal composition containing flufenacet and pyroxasulfone. This composition contains two active ingredients, flufenacet and pyroxasulfone, and is prepared by adding auxiliaries such as wetting agent, dispersant, thickening agent, stabilizer, antifreeze, defoaming agent and water, and mixing, followed by high-speed shearing, wet grinding and homogenization filtration to obtain the suspension agent; it also discloses that the composition has a synergistic effect, but does not disclose a ternary herbicidal combination.

[0009] Shandong Shengbang Luye Chemical Co., Ltd. CN105519555A discloses a post-emergence compound herbicide for corn fields containing flufenacet, and the compound herbicide is prepared from the following components in weight percentages: 1.5-24% of flufenacet, 5-50% of mesotrione, 0.5-19% of thifensulfuron-methyl, 4-23% of auxiliaries, 27-88% of solvent and / or carrier; it has good safety for corn and subsequent crops; it also delays and controls the resistance of weeds and the succession of field weed communities.

[0010] There is no report in the prior art on a ternary herbicidal composition of pyroxasulfone, thifensulfuron-methyl and flufenacet. Summary of the Invention

[0011] The purpose of the present invention is to provide a herbicidal composition containing pyroxasulfone, thifensulfuron-methyl and flufenacet. The specific scheme is as follows:

[0012] A ternary herbicidal composition containing pyroxasulfone, thifensulfuron-methyl and flufenacet, comprising active ingredients in the following mass ratio: the mass ratio of pyroxasulfone, thifensulfuron-methyl and flufenacet is 1-10:0.1-10:1-50.

[0013] Preferably, the mass ratio of pyroxasulfone, thifensulfuron-methyl and flufenacet is 1-8:0.1-5:1-20.

[0014] Preferably, the mass ratio of pyroxasulfone and pyroxasulfone is 1-6:0.1-1:1-6.

[0015] The herbicidal composition of the present invention contains excipient components that are agriculturally acceptable. The percentage content of the active ingredient is 1-80%, preferably 5-60%, and more preferably 10-40%.

[0016] The excipient components include one or more of a dispersant, a wetting agent, an emulsifier, a stabilizer, a thickener, an antifoaming agent, a binder, a disintegrant, a pH regulator, a suspending agent, an antifreeze, a filler or a solvent. Different excipients are selected as needed to prepare corresponding dosage forms. The above excipients are all commonly used and permitted components in pesticide formulations and are not particularly limited.

[0017] The dosage form of the herbicidal composition of the present invention can be an emulsifiable concentrate, an oil suspension concentrate, a suspension concentrate, a wettable powder, a water dispersible granule, a dispersible oil suspension concentrate, an emulsion in water or a microemulsion.

[0018] The herbicidal composition of the present invention can be used to control weeds in wheat fields; the weeds are gramineous weeds, broad-leaved weeds and sedges.

[0019] Beneficial technical effects

[0020] The herbicidal composition of the present invention has a significant synergistic effect, can effectively reduce the dosage of pesticides, reduce the number of pesticide applications, reduce the cost of using pesticides, and reduce the adverse effects of pesticides on the ecological environment. The herbicidal composition of the present invention can expand the herbicidal spectrum, solve various weed problems with a single application, make up for the defects and limitations of single-agent use; extend the service life of the pesticide, which is of great significance for the comprehensive management of weed resistance; the drug effect takes effect quickly, has a long effective period, and has a low use cost, and can be used to control gramineous weeds, broad-leaved weeds and sedge weeds in wheat fields; the herbicidal composition of the present invention is safe for wheat crops through field observation. Specific embodiments

[0021] Example 1: Indoor bioassay of ternary herbicidal composition against gramineous weeds

[0022] Test weed: Alopecurus aequalis Sobol.

[0023] Test conditions: The test was carried out in a greenhouse. The cultivation temperature was 15-20°C at night; 22-32°C during the day;

[0024] Application method: Soil spray treatment before emergence after sowing. Use a pot with a diameter of 15 cm, quantitatively fill the test soil to 4 / 5 of the pot, make the soil completely wet by the way of seepage irrigation at the bottom of the pot, evenly spread the pre-treated test weed seeds on the soil surface, 50 weed seeds per pot, then cover the soil with 0.5 cm. After sowing for 24 h, spray the medicine in the spray tower (ASS-1 type pesticide spraying system, spray pressure 0.3 MPa, liquid spraying amount 450 kg / hm2).

[0025] Investigate the fresh weight of the above-ground part of weeds 21 days after applying the medicine, and calculate the control effect of fresh weight of each treatment according to the formula. Control effect of fresh weight = (fresh weight of control - fresh weight of treatment) / fresh weight of control × 100%.

[0026] Combined action: Use Gowing to evaluate the combined action of the composition.

[0027] E0 = X + Y(100 - Y) / 100; when E - E0 > 10% is synergistic effect; when E - E0 < -10% is antagonistic effect; when the value of E - E0 is between the theoretical value ±10% is additive effect.

[0028] Test results: As can be seen from Table 1, the ternary compound composition has a significant synergistic effect on the grass weed Alopecurus aequalis; especially adding flufenacet to the binary compound herbicide composition of pyroxasulfone and thifensulfuron can significantly improve the control effect of the herbicide composition on Alopecurus aequalis, with a significant synergistic effect.

[0029] Table 1 Determination of the combined action of compound herbicides on Alopecurus aequalis

[0030] Example 2: Indoor bioassay of ternary herbicide composition on broad-leaved weeds

[0031] Test weed: Amaranthus retroflexus

[0032] Test conditions: The test is carried out in a greenhouse. The cultivation temperature is 15 - 20 °C at night; 22 - 32 °C during the day;

[0033] Application method: Soil spray treatment before emergence after sowing. Use a pot with a diameter of 15 cm, quantitatively fill the test soil to 4 / 5 of the pot, make the soil completely wet by the way of seepage irrigation at the bottom of the pot, evenly spread the pre-treated test weed seeds on the soil surface, 50 weed seeds per pot, then cover the soil with 0.5 cm. After sowing for 24 h, spray the medicine in the spray tower (ASS-1 type pesticide spraying system, spray pressure 0.3 MPa, liquid spraying amount 450 kg / hm2).

[0034] Investigate the fresh weight of the above-ground part of weeds 21 days after applying the medicine, and calculate the control effect of fresh weight of each treatment according to the formula. Control effect of fresh weight = (fresh weight of control - fresh weight of treatment) / fresh weight of control × 100%.

[0035] Combined action: The gowing method was used to evaluate the combined action of the composition.

[0036] E0 = X + Y(100 - Y) / 100; When E - E0 > 10% it is a synergistic effect; when E - E0 < -10% it is an antagonistic effect; when the value of E - E0 is between the theoretical value ±10% it is an additive effect.

[0037] Test results: As can be seen from Table 2, the ternary compound composition has a significant synergistic effect on the broadleaf and grassy weed Amaranthus retroflexus; especially adding thifensulfuron-methyl to the herbicidal composition of the binary compound sulfentrazone and flufenacet can significantly improve the control effect of the herbicidal composition on Alopecurus aequalis, showing a significant synergistic effect.

[0038] Table 2 Determination of the combined action of the compound herbicides on Amaranthus retroflexus

[0039]

[0040] Example 3:

[0041] Test site: Conducted in a wheat field in Daiyue District, Tai'an City, Shandong Province. The test plot is flat and the soil is loam.

[0042] Test agents:

[0043] 27% sulfentrazone·nitrofen·sulfentrazone·flufenacet oil suspension concentrate, containing the following components by weight percentage:

[0044] Sulfentrazone 10%, thifensulfuron-methyl 2%, flufenacet 15%, agricultural emulsifier 1601# 3%, sodium lignosulfonate 4%, NNO 2%, bentonite 1.0%, methyl oleate to make up 100%.

[0045] 35% sulfentrazone·nitrofen·sulfentrazone·flufenacet oil suspension concentrate, containing the following components by weight percentage:

[0046] Sulfentrazone 12%, thifensulfuron-methyl 3%, flufenacet 20%, agricultural emulsifier 1601# 6%, sodium lignosulfonate 5%, NNO 3%, bentonite 1.5%, methyl oleate to make up 100%.

[0047] Test method: The test was set up with agent treatments and a blank control. Each treatment had 4 replicates, the plot area was 30 m2 (5 m * 6 m), and it was arranged in a randomized block design. After sowing, soil spraying treatment was used.

[0048] Weed control efficacy investigation: The absolute value investigation method was used. At 45 days after application, 4 sample points were randomly selected in the plot, each sample point was 0.25 m2, and the fresh weight of the above-ground part of the weeds was measured. The fresh weight control efficacy was calculated according to the formula.

[0049] Fresh weight control efficacy = (control fresh weight - treatment fresh weight) / control fresh weight × 100%.

[0050] Test results: When the dosage of the active ingredient of the compound agent of the present invention is 10-15 g / mu, it has excellent control effects on weeds in wheat fields, grass weeds and broad-leaved weeds.

[0051] Table 3: Field control effect test of compound agent on weeds in wheat fields Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it.

Claims

1. A ternary herbicidal composition containing oxasulfuron, thifensulfuron-methyl and flufenacet, characterized in that, The active ingredients consist of pyroxasulfone, thifensulfuron-methyl and flufenacet, and the mass ratio of pyroxasulfone, thifensulfuron-methyl to flufenacet is 1-6: 0.1-1: 1-6.

2. The herbicidal composition according to the claim, characterized in that, It contains auxiliary ingredients that can be used in pesticides, and the percentage content of the active ingredients is 1-80%; the auxiliary ingredients are one or more of dispersants, wetting agents, emulsifiers, stabilizers, thickeners, defoamers, binders, disintegrants, pH regulators, suspending agents, antifreeze agents, fillers or solvents.

3. The herbicidal composition according to claim 2, wherein The dosage form of the herbicidal composition is emulsifiable concentrate, oil suspension concentrate, suspension concentrate, wettable powder, water dispersible granule, dispersible oil suspension concentrate, emulsion in water or microemulsion.

4. Use of the herbicidal composition according to any one of claims 1-3 for controlling weeds in wheat fields, characterized in that, The weeds are gramineous weeds or broad-leaved weeds.

Images