Weeding composition containing dichloroclomazone

Abstract

The invention belongs to the technical field of compound pesticides, and discloses a weeding composition containing dichloroclomazone and pinoxaden. In the weeding composition, the mass ratio of pinoxaden to dichloro clomazone is (0.8-2.2): (1-7), and the mass percentage content of the effective active ingredients in the preparation is 1%-80%. The weeding composition disclosed by the invention can be prepared into missible oil, a dispersible oil suspending agent and water dispersible granules. According to the weeding composition, the two active components are compounded to achieve an obvious synergistic effect, the dosage of the pesticide can be reduced, the cost can be reduced, the weed control spectrum can be expanded, and the weeding composition has an excellent control effect on gramineous weeds in wheat fields.

Description

Technical Field

[0001] The invention relates to a weeding composition containing clomazone, in particular to a weeding composition containing clomazone and pinoxaden, and belongs to the technical field of pesticide compounding. Background Art

[0002] Bixlozone, English name: Bixlozone, is an oxadiazine herbicide developed by FMC in the United States. It is mainly used to control grass weeds and broad-leaved weeds such as multiflora ryegrass, wild oats, and cleavers in wheat, barley, and rapeseed fields.

[0003] Pinoxaden, English name: pinoxaden, is a phenylpyrazoline herbicide developed by Syngenta. It is an acetyl-CoA carboxylase inhibitor. Its mechanism of action is to hinder the biosynthesis of fatty acids, interfere with cell membrane formation, stop weed growth, and eventually die. It is mainly used for stem and leaf treatment after wheat seedlings, and can prevent most annual grass weeds such as sedge, foxtail millet, wild oats, hard grass, and ryegrass.

[0004] At present, for the prevention and control of gramineous weeds in wheat fields such as multiflora ryegrass and foxtail millet, the market mostly uses acetolactate synthase inhibitors or acetyl-CoA carboxylase inhibitors such as mesosulfuron, fenoxaprop-butyl, pinoxaclostrobin, and clodinafop-butyl. However, due to the long-term single use of these herbicides, resistant weeds continue to spread and the difficulty of prevention and control continues to increase. Under the current market environment, dichloroisothiazide was first promoted in the market of gramineous weeds in wheat fields with the greatest difficulty in prevention and control, such as multiflora ryegrass in Henan, foxtail millet in Jiangsu (Japan), and foxtail millet, and the market feedback was good. In order to prevent the long-term single use of dichloroisothiazide from causing the generation of weed resistance, the present invention provides a herbicidal composition containing dichloroisothiazide, which can improve the prevention effect, reduce the amount of pesticide used, and delay the generation of weed resistance. Summary of the invention

[0005] The object of the present invention is to provide a herbicidal composition containing clomazone which has significant synergistic effect, low drug cost and is safe for crops.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] First active ingredient: pinoxaden;

[0008] Second active ingredient: clomazone;

[0009] The mass ratio of the first active ingredient to the second active ingredient is: (0.8-2.2):(1-7), preferably: (1-2):(1.5-6).

[0010] In various application dosage forms prepared from the herbicidal composition of the present invention, in addition to the effective active ingredients, it also includes various auxiliary ingredients that are allowed to be used and acceptable in different pesticide dosage forms.

[0011] The auxiliary ingredients include, but are not limited to, emulsifiers, dispersants, wetting agents, solvents, antifreezing agents, defoaming agents, thickeners, disintegrants, synergists, preservatives, fillers, etc., which are all commonly used or allowed ingredients in pesticide formulations and are not particularly limited. The specific ingredients and dosages are determined through experiments according to the formulation requirements.

[0012] The emulsifier can be various emulsifiers well-known in the field of pesticide dosage forms, and the emulsifier can be one or more of phenethylphenol polyoxyethylene polyoxypropylene ether, alkylaryl polyoxyethylene polyoxypropylene ether, fatty acid polyoxyethylene ether, fatty alcohol polyoxyethylene ether, glycerol laurate polyoxyethylene ether, styrylphenol polyoxyethylene ether, castor oil polyoxyethylene ether, alkylphenol polyoxypropylene polyoxyethylene ether, styrylphenyl polyoxyethylene ether, alkylphenol polyoxyethylene ether, sorbitan fatty acid ester polyoxyethylene ether, fatty alcohol polyoxyethylene ether sulfonate, alkylphenol polyoxyethylene formaldehyde condensate, calcium dodecylsulfonate, alkylphenol polyoxyethylene ether sulfosuccinate monoester, alkylphenol polyoxyethylene phosphate, alkylphenol polyoxyethylene ether sulfonated succinate.

[0013] The dispersant can be various dispersants well-known in the field of pesticide formulations, and the dispersant can be one or more of alkylphenol polyoxyethylene ether phosphate, alkylphenol polyoxyethylene ether sulfate, phenethylphenol polyoxyethylene ether phosphate, polyoxyethylene polyoxypropylene block copolymer, sodium lignosulfonate, sodium methylene bisnaphthalenesulfonate (dispersant NNO), calcium lignosulfonate, polycarboxylate, methylene bisnaphthalenesulfonate, methylene bismethylnaphthalenesulfonate, polyvinylpyrrolidone, alkanoylaminotaurate, alkylnaphthalene sulfonic acid condensate sodium salt, sodium methylene bisnaphthalenesulfonate formaldehyde condensate.

[0014] The wetting agent can be various wetting agents well-known in the field of pesticide formulations, and the wetting agent can be one or more of sodium alkylnaphthalenesulfonate, sodium dodecylsulfate, secondary sodium alkylsulfate, sodium dodecylbenzenesulfonate, fatty alcohol polyglycol ether sulfate, fatty alcohol polyoxyethylene ether, nonylphenol polyoxyethylene ether, sorbitan fatty acid ester polyoxyethylene ether, alkylnaphthalene formaldehyde condensate, alkylnaphthalenesulfonate and other wetting agents.

[0015] The solvent can be various solvents well-known in the field of pesticide formulations, and the solvent can be one or more of water, methanol, ethanol, N-methylpyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, tetrahydrofurfuryl alcohol, toluene, xylene, dimethyl sulfoxide, tetrahydrofuran, cyclohexanone, n-butanol, isopropanol, solvent oil No. 100, No. 150, No. 180, No. 200.

[0016] The antifreeze agent can be various antifreeze agents well-known in the field of pesticide formulations, and the antifreeze agent can be one or more of ethylene glycol, propylene glycol, glycerol, diethylene glycol, urea, and inorganic salts.

[0017] The defoaming agent can be various defoaming agents well-known in the field of pesticide formulations, and the defoaming agent can be one or more of silicone compounds, epoxy soybean oil, emulsified silicone oil, and fatty alcohols.

[0018] The thickening agent can be various thickening agents well-known in the field of pesticide formulations, and the thickening agent can be one or more of xanthan gum, polyvinyl alcohol, sodium alginate, gum arabic, and magnesium aluminum silicate.

[0019] The disintegrant can be various disintegrants well-known in the field of pesticide formulations, and the disintegrant can be one or more of ammonium sulfate, sodium carboxymethyl starch, urea, low-substituted hydroxypropyl cellulose, cross-linked carboxymethyl cellulose sodium, cross-linked polyvinylpyrrolidone, sodium alginate, sodium bicarbonate, and sodium chloride.

[0020] The carrier can be various carriers well-known in the field of pesticide formulations, and the carrier can be one or more of glucose, silica white, kaolin, diatomaceous earth, light calcium carbonate, heavy calcium carbonate, attapulgite, soluble starch, urea, maltose, sucrose, citric acid, potassium carbonate, sodium carbonate, and anhydrous sodium sulfate.

[0021] The preservative can be various preservatives well-known in the field of pesticide formulations, and the preservative can be one or more of Kathon, sodium benzoate, benzoic acid, potassium sorbate, and formaldehyde.

[0022] Another object of the present invention is to provide the application of the composition in controlling gramineous weeds in wheat crops.

[0023] The wheat crops are wheat, barley, oats, and rye.

[0024] The gramineous weeds are Lolium multiflorum, Alopecurus aequalis, Alopecurus japonicus, Beckmannia syzigachne, Avena fatua, Bromus japonicus, Aegilops tauschii, Echinochloa crusgalli, Poa annua, Galium aparine, Sclerochloa dura, Phleum paniculatum, Polypogon fugax.

[0025] The technical effects achieved by the present invention:

[0026] 1. After the compounding of clomazone and pinoxaden, there is an obvious synergistic effect, which can reduce the dosage of pesticides, lower the cost, and expand the herbicidal spectrum;

[0027] 2. Delay the generation of weed resistance;

[0028] 3. Reduce pesticide residues and protect the environment. Detailed implementation manners

[0029] The joint action of clomazone and pinoxaden in controlling Lolium multiflorum and Alopecurus aequalis Sobol. was illustrated by indoor toxicity determination as follows.

[0030] The stem and leaf spraying method was adopted in the experiment. The technical materials were formulated into the required experimental agents, and five different concentration gradients were set for single agents and compound agents (based on the preliminary test results, the concentration gradients were set differently according to different agent ratios, and the control rates were set in geometric progression within the range of 5% - 90%). The farmland soil and organic matter taken from the suburbs were mixed at a ratio of 1:1, sterilized, and filled to 4 / 5 of the height of flowerpots with a diameter of about 10 cm and a height of about 10 cm. Water was added to wet the soil for seeding. 25 seeds were sown in each pot, and the stem and leaf spraying treatment was carried out when the weeds were at the 2 - 3 leaf stage. Each treatment was repeated 4 times, and the water treatment was set as the blank control. After treatment, they were placed in the greenhouse for cultivation and observation, and water was supplemented by seepage irrigation at the bottom of the flowerpots. The control effects of each agent treatment were calculated 21 days after treatment.

[0031] The Gowing method was used to evaluate the joint action after the combination of two active ingredients. First, the control effects of single agents and mixtures on target weeds were measured, and then the theoretical control effect of the mixture was calculated based on the measured control effects of single agents. The joint action type was evaluated by comparing it with the measured control effect of the mixture.

[0032] Calculation formula: E0 = X + Y - XY / 100

[0033] Where: X is the fresh weight control effect of A when the dosage is P;

[0034] Y is the fresh weight control effect of B when the dosage is Q;

[0035] E0 is the theoretical fresh weight control effect of A + B when the dosage is P + Q;

[0036] E is the measured fresh weight control effect of each treatment

[0037] When E - E0 is greater than 10%, it indicates that synergistic effect is produced by mixing; when E - E0 is less than -10%, it indicates that antagonistic effect is produced by mixing; when the value of E - E0 is between -10% and 10%, it indicates that additive effect is produced by mixing.

[0038] The following are the results of indoor toxicity determination:

[0039] Table 1 Indoor toxicity determination of the combination of clomazone and pinoxaden against Lolium multiflorum

[0040]

[0041] Table 2 Indoor toxicity determination of the combination of clomazone and pinoxaden against Alopecurus aequalis Sobol.

[0042]

[0043] As can be seen from Table 1 and Table 2, when pyroxasulfone and clomazone are mixed in a certain proportion, they have a certain synergistic effect on the gramineous weeds Lolium multiflorum and Alopecurus aequalis. When the mixing ratio is 1:3, the synergistic effect is the most obvious.

[0044] To better illustrate the present invention, the content of the present invention will be further described below in conjunction with embodiments, and the percentages in the formulations are all weight percentages.

[0045] Formulation Example 1

[0046] Weigh 4% pyroxasulfone, 12% clomazone, 2.4% cloquintocet-mexyl, 3% sodium lignosulfonate, 5% agricultural emulsifier 2201, 4% Span-60#, 2% alkyl sulfonate, 2% bentonite, 3% propylene glycol, and add wheat oil to 100% by weight. The above raw materials are mixed, sheared and dispersed at high speed for 30 min, and then ground with a sand mill to obtain a 16% pyroxasulfone·clomazone dispersible oil suspension concentrate.

[0047] Formulation Example 2

[0048] Weigh 5% pyroxasulfone, 15% clomazone, 3% cloquintocet-mexyl, 2% agricultural emulsifier 700#, 2% agricultural emulsifier 1601#, 4% Span-60#, 3% acetone, 2% triphenyl phosphite, and add toluene to 100% by weight. The above raw materials are mixed and stirred until completely dissolved to obtain a 20% pyroxasulfone·clomazone emulsifiable concentrate.

[0049] Formulation Example 3

[0050] Weigh 5% pyroxasulfone, 15% clomazone, 3% cloquintocet-mexyl, 4% agricultural emulsifier 500#, 2% TX-10, 2% agricultural emulsifier 1601#, 5% ethyl acetate, and add biodiesel to 100% by weight. The above raw materials are mixed and stirred until completely dissolved to obtain a 20% pyroxasulfone·clomazone emulsifiable concentrate.

[0051] Biological Example 1: Efficacy test for controlling gramineous weeds in wheat fields.

[0052] The inventor conducted field efficacy tests on Formulation Example 1, Formulation Example 2, Formulation Example 3 and the control agent for controlling gramineous weeds in wheat fields in Henan in 2024, in order to obtain the control effect of the compound preparation on gramineous weeds in wheat fields and the safety to wheat.

[0053] Test method: The test field is flat, with medium fertility. The plots are randomly arranged in blocks, and each plot is 30 m 2, for every 4 repetitions of treatment, another treatment with clear water was set as the blank control. The conventional spraying method was used during application. When the medicine was applied, the wheat was in the seedling stage and the weeds were in the 2-5 leaf stage. The water consumption was 30 kg / mu. Only one application was made during the test period. The plant control efficacy was investigated and calculated 30 days after application. The safety of each test treatment to wheat was visually observed 3-15 days after application.

[0054] Calculation formula: Plant control efficacy = (number of plants in the control area - number of plants in the medicament treatment area) / number of plants in the control area × 100%

[0055] Table 3 Results of the efficacy test for controlling gramineous weeds in wheat fields

[0056]

[0057] As can be seen from Table 3, when the mixture of pinoxaden and clomazone was applied to wheat fields at the 2-5 leaf stage of weeds, it had good control effects on Lolium multiflorum, Alopecurus aequalis, Beckmannia syzigachne, and Avena fatua in wheat fields. The comprehensive plant control efficacy reached 88%-91%. The control efficacy of each preparation example was higher than that of the control medicament, and it was safe for wheat without phytotoxicity.

[0058] In summary, the composition of the present invention adopts the technical scheme of compounding two active ingredients. Its activity and weeding effect are not a simple superposition of each component. Compared with the existing single preparations, it has an obvious synergistic effect, can expand the weeding spectrum, reduce the dosage of medicines, lower costs, protect the environment, and delay the generation of drug resistance.

Claims

1. A herbicidal composition containing clomazone, characterized in that, In the composition, the effective active ingredients comprise pinoxaden and clomazone, wherein the mass ratio of pinoxaden to clomazone is (0.8 - 2.2):(1 - 7).

2. The herbicidal composition according to claim 1, wherein The mass ratio of pinoxaden to clomazone is (1 - 2):(1.5 - 6).

3. The herbicidal composition according to claim 1, characterized in that, The mass ratio of pinoxaden to clomazone is 1:

3.

4. The herbicidal composition according to claim 1, characterized in that, By mass percentage, the mass percentage content of the effective active ingredients in the preparation is 1% - 80%.

5. The herbicidal composition according to claim 1, characterized in that, The dosage form of the composition preparation is emulsifiable concentrate, dispersible oil suspension, or water dispersible granule.

6. Application of the herbicidal composition according to claim 1 in controlling weeds in wheat fields.

7. The application according to claim 6, wherein The weeds in the wheat fields are gramineous weeds.

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