Weeding composition containing benzopyridone and application of weeding composition

Abstract

The invention relates to the field of pesticides, and in particular relates to a weeding composition containing benzylprexydim, the weeding composition containing benzylprexydim comprises an active component A and an active component B. The active component A is benzylprexydim, the active component B is butachlor or pyrazosulfuron-ethyl, and the mass ratio of the active component A to the active component B is 1: 60-40: 1. The weeding composition disclosed by the invention expands a weed control spectrum, has an excellent control effect on annual weeds in a paddy field, is obvious in synergistic interaction, is safe to crops and is environment-friendly.

Description

Technical Field

[0001] The present invention relates to the field of pesticides, and specifically relates to a herbicidal composition containing fentrazamide; it also relates to the use of the herbicidal composition for preventing and controlling the germination or growth of unwanted plants. Background Art

[0002] Weeds are unwanted plants that can seriously damage crop yields. Farmers usually control these plants during the pre-planting stage and after sowing. Modern herbicides are used to control or inhibit these unwanted plants, so that the sown crops can obtain more nutrients.

[0003] The use of chemical herbicides is one of the important signs of modern agriculture. In recent years, the sales volume of herbicides has increased year by year, and the application area has also expanded year by year. However, with the continuous large-area use of many herbicide varieties, many problems have arisen. For example, the problem of weed resistance has begun to emerge, especially the resistance problem of older weeds is particularly prominent; in addition, the single-agent herbicides have a single mode of action and a short effective period, etc. Therefore, there is an urgent need for long-acting herbicides and their combinations with a wide weeding range, strong selectivity and less pressure on weed resistance. Mixing different types of herbicides has the advantages of a wide herbicidal spectrum, improved actual effect, delayed weed resistance, time-saving and labor-saving.

[0004] The applicant mixed fentrazamide with either butachlor or pyrazosulfuron-ethyl and found that there is a synergistic effect on the control of paddy field weeds within a certain mixing ratio range, with good quick-acting property, long effective period, and effectively reducing the generation of weed resistance, reducing the drug cost and the number of drug applications, and being safer and more efficient. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems of the existing herbicides causing resistance to paddy field weeds and poor actual control effect, and to provide a herbicidal composition containing fentrazamide that is highly efficient, low-toxic, has good quick-acting property, long effective period, and is beneficial to the comprehensive management of paddy field weeds.

[0006] In order to achieve the above purpose, the present invention adopts the following technical scheme: A herbicidal composition containing fentrazamide, the active ingredients of the herbicidal composition include active ingredient A and active ingredient B, the active ingredient A is fentrazamide, and the active ingredient B is butachlor or pyrazosulfuron-ethyl.

[0007] Furthermore, the mass ratio of active ingredient A to active ingredient B in the herbicidal composition is 1:60 to 40:1;

[0008] Furthermore, the active ingredient B is butachlor, and the mass ratio of fentrazamide to butachlor is 1:60 to 15:1;

[0009] Further, the mass ratio of the fentrazamide to the butachlor is 1:60 to 4:5;

[0010] Still further, the mass ratio of the fentrazamide to the butachlor is 1:20, 1:60, 8:20, 8:60, 8:100, 16:20, 16:60, 16:100;

[0011] Further, the active ingredient B is pyrazosulfuron-ethyl, and the mass ratio of the fentrazamide to the pyrazosulfuron-ethyl is 1:16 to 30:1;

[0012] Further, the mass ratio of the fentrazamide to the pyrazosulfuron-ethyl is 1:8 to 16:1;

[0013] Still further, the mass ratio of the fentrazamide to the pyrazosulfuron-ethyl is 1:1, 1:3, 1:8, 8:1, 8:3, 8:8, 16:1, 16:3, 16:8;

[0014] Further, taking the total weight of the herbicidal composition as 100 wt%, the total weight of the active ingredient A and the active ingredient B accounts for 0.1% to 80% of the herbicidal composition

[0015] Further, the total weight of the active ingredient A and the active ingredient B accounts for 5% to 60% of the herbicidal composition;

[0016] Further, the total weight of the active ingredient A and the active ingredient B accounts for 5%, 5.5%, 7%, 8%, 9%, 10%, 11%, 12%, 12.5%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 55%, 60% of the herbicidal composition;

[0017] Further, in addition to the active ingredients, the herbicidal composition further contains other auxiliary ingredients, and the auxiliary ingredients are selected from one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreezing agents, defoaming agents, solvents, preservatives, stabilizers, synergists or carriers;

[0018] Further, the emulsifier is selected from one or more of agricultural emulsifier 500# (calcium alkylbenzenesulfonate), OP series phosphates (surfactant phosphates), 600# phosphates (phenylphenol polyoxyethylene ether phosphate), styrene polyoxyethylene ether wetting agent salt, alkyl biphenyl ether disulfonate magnesium salt, triethanolamine salt, agricultural emulsifier 400# (benzyl dimethylphenol polyoxyethyl ether), agricultural emulsifier 700# (alkylphenol formaldehyde resin polyoxyethyl ether), Ningru 36# (phenylethylphenol formaldehyde resin polyoxyethyl ether), agricultural emulsifier 1600# (phenylethylphenol polyoxyethyl polypropylene ether), ethylene oxide - propylene oxide block copolymer, OP series (surfactants), BY series (castor oil polyoxyethylene ether), agricultural emulsifier 33# (alkylaryl polyoxyethylene polyoxypropylene ether), Span series (sorbitan monostearate), Tween series (polyoxyethylene sorbitan fatty acid ester), or AEO series (fatty alcohol polyoxyethylene ether);

[0019] Further, the dispersant is selected from one or more of polycarboxylates, lignosulfonates, alkylphenol polyoxyethylene ether formaldehyde condensate sulfates, calcium alkylbenzenesulfonate, naphthalene sulfonic acid formaldehyde condensate sodium salt, alkylphenol polyoxyethylene ether, fatty amine polyoxyethylene ether, fatty acid polyoxyethylene ether, or glycerol fatty acid ester polyoxyethylene ether;

[0020] Further, the wetting agent is selected from one or more of sodium dodecyl sulfate, sodium dodecylbenzenesulfonate, Nekal BX, wetting penetrant F, soapberry powder, silkworm excrement, or sapindus powder;

[0021] Further, the penetrant is selected from one or more of penetrant JFC (fatty alcohol polyoxyethylene ether), penetrant T (diisooctyl maleate sulfonate), azone, or silicone;

[0022] Further, the dispersion medium is one or more of soybean oil, rapeseed oil, wheat oil, methyl oleate, diesel oil, machine oil, mineral oil, etc.;

[0023] Further, the antifreeze is selected from one or more of ethylene glycol, propylene glycol, glycerol, or urea;

[0024] Further, the thickener is selected from one or more of xanthan gum, disintegrant, bentonite, carboxymethyl cellulose, or magnesium aluminum silicate;

[0025] Further, the stabilizer is selected from one or more of epoxidized soybean oil, epichlorohydrin, BHT, ethyl acetate, triphenyl phosphate;

[0026] Further, the disintegrant is selected from one or more of bentonite, urea, aluminum chloride, low-substituted hydroxypropyl cellulose, lactose, citric acid, succinic acid, or sodium bicarbonate;

[0027] Further, the defoaming agent is selected from one or more of silicone oil, silicone compounds, C 10 ~C 20 saturated fatty acid compounds, or C8~C 10 fatty alcohol compounds;

[0028] Further, the preparation dosage form prepared from the weeding composition is a solid preparation and / or a liquid preparation;

[0029] Further, the solid preparation includes powder, granule, sphere, tablet, strip, wettable powder, oil-dispersed powder, milk powder, water-dispersible granule, milk granule, water-dispersible tablet, soluble powder, soluble tablet, or soluble granule;

[0030] Further, the liquid preparation includes soluble solution, sol, oil, film-spreading oil, emulsifiable concentrate, latex, dispersible liquid, paste, water emulsion, oil emulsion, microemulsion, fat agent, suspending agent, microcapsule suspension, oil suspending agent, dispersible oil suspending agent, suspension emulsion, microcapsule suspension-suspending agent, microcapsule suspension-water emulsion, or microcapsule suspension-suspension emulsion;

[0031] Further, the solid preparation is a water-dispersible granule or a wettable powder, and the liquid preparation is a suspending agent, an emulsifiable concentrate, or a dispersible oil suspending agent.

[0032] Use of a weeding composition containing benzobicyclon for controlling unwanted plants;

[0033] Further, the unwanted plants are broadleaf, gramineous, and / or cyperaceous weeds.

[0034] Further, the growth sites of the unwanted plants are rice fields, wheat fields, barley fields, rye fields, rapeseed fields, beet fields, corn fields, turf, cotton fields, vegetable fields, sugarcane fields, and soybean fields.

[0035] A method for controlling unwanted plants, including applying a weeding composition containing benzobicyclon to the unwanted plants or their growth sites.

[0036] The beneficial effects of the present invention are as follows:

[0037] 1) The weeding composition provided by the present invention can efficiently control various common weeds, even resistant weeds, and delay the development of weed resistance;

[0038] 2) The herbicidal composition of the present invention broadens the herbicidal spectrum, has excellent activity against gramineous, cyperaceous and broad-leaved weeds, overcomes the problem of narrow herbicidal spectrum of single herbicides, has a long effective period, is safe for crops, can reduce the dosage of pesticides, and reduce the application cost. Detailed implementation manners

[0039] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] Formulation preparation examples:

[0041] Preparation example 1: 20% benzobicyclon·butachlor EC (2.5 + 17.5)

[0042] Formulation composition: 2.5% benzobicyclon, 17.5% butachlor, 25% propylene carbonate, 8% cyclohexanone, 2% calcium dodecylbenzenesulfonate, 12% alkylphenol polyoxyethylene ether, and the balance is made up with methyl oleate;

[0043] Preparation method: Add the active ingredients into the carrier according to the formulation ratio of the embodiment, and add surfactants and other functional auxiliaries thereto, and stir and mix evenly in a stirring and mixing kettle to obtain an EC product.

[0044] Preparation example 2: 42% benzobicyclon·butachlor suspoemulsion (6 + 36)

[0045] Formulation composition: 6% benzobicyclon, 36% butachlor, 1% isomeric tridecanol polyoxyethylene ether, 5% styrylphenol polyoxyethylene ether phosphate, 1% lignosulfonate, 3% alkylaryl polyoxyethylene ether polypropylene oxide ether, 0.15% xanthan gum, 5% propylene glycol, 0.1% sodium benzoate, 0.5% silicone oil, and the balance is made up with deionized water;

[0046] Preparation method: First, mix the solid technical material, part of the auxiliaries and part of the water evenly according to the ratio, and obtain an aqueous suspension agent after high-speed shearing and wet grinding; secondly, stir and mix the liquid technical material and the emulsifier evenly to obtain an oil phase. Finally, fully mix and stir the aqueous suspension agent and the oil phase, and obtain a suspoemulsion product after high-speed shearing.

[0047] Preparation example 3: 27% benzobicyclon·butachlor wettable powder (3 + 24)

[0048] Formulation composition: 3% of propaquizafop, 24% of butachlor, 10% of sodium lignosulfonate, 8% of polycarboxylate, 2% of sodium dodecyl sulfate, 30% of silica white, and kaolin to make up the balance.

[0049] Preparation method: According to the formulation ratio of the examples, add the active ingredients into the carrier, and add surfactants and other functional auxiliaries thereto, mix, and then mix again after airflow comminution to obtain the wettable powder product.

[0050] Preparation Example 4: 10% propaquizafop·pyrazosulfuron-ethyl wettable powder (7.5 + 2.5)

[0051] Formulation composition: 7.5% of propaquizafop, 2.5% of pyrazosulfuron-ethyl, 10% of dispersant NNO, 5% of tea saponin, 2% of alkyl polyoxyethylene ether sulfonate, 5% of silica white, and kaolin to make up the balance.

[0052] Preparation method: The same as that of Preparation Example 3.

[0053] Preparation Example 5: 22% propaquizafop·pyrazosulfuron-ethyl dispersible oil suspension concentrate (16 + 6)

[0054] Formulation composition: 16% of propaquizafop, 6% of pyrazosulfuron-ethyl, 12% of castor oil polyoxyethylene ether, 5% of alkylaryl polyoxyethylene ether polypropylene ether, 2% of octylphenol polyoxyethylene ether phosphate, 1% of calcium dodecylbenzenesulfonate, 0.5% of organic bentonite, 1% of fumed silica, and methyl oleate to make up the balance;

[0055] Preparation method: According to the formulation ratio of the examples, place the active ingredients, surfactants and other functional auxiliaries into the reaction kettle in sequence, add the oily medium and mix evenly, and then perform high-speed shear sanding and finally homogenize and filter to obtain the dispersible oil suspension concentrate product.

[0056] Example 1:

[0057] Indoor bioactivity determination

[0058] Test basis: The test refers to NY / T 1155.4-2006 "Pesticide indoor bioassay test guidelines Herbicides Part 4: Activity determination test Stem and leaf spray method".

[0059] Test targets: Leptochloa chinensis, Echinochloa crusgalli, Sagittaria trifolia, Monochoria vaginalis, Cyperus difformis;

[0060] Instrument and equipment: Light incubator, quantitative spraying equipment, electronic balance, flowerpot, pipette, etc.;

[0061] Test soil: The test uses air-dried loam with organic matter content ≤ 3%, neutral pH, good air permeability, and sifted.

[0062] Test materials: quantitatively fill the test soil to 4 / 5 of the pot, and then infiltrate from the bottom of the pot to make the soil completely wet to saturation. Pre-treated test weed seeds are evenly spread on the soil surface, and covered with 0.5cm to 2cm of soil according to the size of the seeds. After sowing, they are transferred to the greenhouse for routine cultivation. After the weeds emerge, thinning and fixing are carried out to ensure the uniform density of weeds. According to the characteristics of the agent, the appropriate leaf age is selected for stem and leaf spraying.

[0063] Test agents: 90% benzothiocarb technical, 90% butachlor technical, 98% pyrazosulfuron technical.

[0064] Preparation of medicine: Dissolve the above raw medicine with a suitable solvent, and then dilute with 0.1% Tween 80 aqueous solution.

[0065] Chemical treatment: According to the experimental design, the stem and leaf spray treatment was carried out from low dose to high dose. Each treatment was repeated 4 times, and the treatment without chemical was set as a blank control. After the treatment, the chemical solution on the surface of the test material was naturally air-dried and moved into the greenhouse for conventional cultivation.

[0066] Investigation: The herbicidal activity was recorded by the absolute value investigation method 14 days after treatment.

[0067] Calculation method:

[0068] Fresh weight protection effect E = (fresh weight of control area - fresh weight of treatment area) × 100 / fresh weight of control area

[0069] The combined effect of the mixture was determined by the Gowing method, and the calculation formula is as follows:

[0070] Theoretical control effect of mixture E0 = weed control effect of herbicide A at dosage P + weed control effect of herbicide B at dosage Q - weed control effect of herbicide A at dosage P × weed control effect of herbicide B at dosage Q ÷ 100

[0071] Evaluation criteria for the combined effects of mixed drugs:

[0072] E-E0>10% is a synergistic effect, E-E0<-10% is an antagonistic effect, and E-E0 between ±10% is an additive effect.

[0073] Test results:

[0074] As shown in Table 1-5, the mass ratios of fentrazamide to butachlor of 1:20, 8:20, 8:60, 8:100, 16:20, 16:60, and 16:100 have synergistic effects on Leptochloa chinensis and Sagittaria trifolia; the mass ratios of fentrazamide to butachlor of 1:20, 1:60, 8:20, 8:60, 8:100, 16:20, 16:60, and 16:100 all have synergistic effects on Echinochloa crusgalli, Monochoria vaginalis, and Cyperus difformis in indoor combined effects; the mass ratios of fentrazamide to pyrazosulfuron-ethyl of 1:1, 1:3, 1:8, 8:1, 8:3, 8:8, 16:1, 16:3, and 16:8 all have synergistic effects on Leptochloa chinensis, Echinochloa crusgalli, Sagittaria trifolia, Monochoria vaginalis, and Cyperus difformis in indoor combined effects.

[0075] Table 1 Combined effects of the mixture of fentrazamide and butachlor or pyrazosulfuron-ethyl on Leptochloa chinensis

[0076]

[0077]

[0078] Table 2 Combined effects of the mixture of fentrazamide and butachlor or pyrazosulfuron-ethyl on Echinochloa crusgalli

[0079]

[0080] Table 3 Combined effects of the mixture of fentrazamide and butachlor or pyrazosulfuron-ethyl on Sagittaria trifolia

[0081]

[0082] Table 4 Combined effects of the mixture of fentrazamide and butachlor or pyrazosulfuron-ethyl on Monochoria vaginalis

[0083]

[0084]

[0085] Table 5 Combined effects of the mixture of fentrazamide and butachlor or pyrazosulfuron-ethyl on Cyperus difformis

[0086]

[0087]

[0088] Field efficacy test

[0089] Test site: Shucheng planting base, Lu'an City, Anhui Province. The soil fertility of the test field is medium to high, and the terrain is flat.

[0090] Test crop: Rice.

[0091] Experimental plot arrangement: A total of 8 treatments were set up in the experiment, with each treatment replicated 4 times. The experimental plots were arranged in a randomized block design, and the area of each experimental plot was 20 m 2 .

[0092] Application time and method: The experiment was carried out on May 6, 2021, when weeds emerged successively, and foliar spray application was carried out. The weather was cloudy during application, and the temperature was 20 - 25 °C. A knapsack electric sprayer was used for uniform spraying during application.

[0093] Method for efficacy investigation: Four random sampling points were taken in each plot, and 0.25 m was investigated at each point 2 . The number of surviving weed plants in each plot was investigated 15 days and 45 days after application, and the control efficacy of weeds was calculated; the weeds were pulled out 45 days after application and the fresh weight was weighed to calculate the fresh weight control efficacy.

[0094] Yield investigation: At the time of rice harvest, five sampling points were taken along the diagonal of each plot, and 1 m was investigated at each point 2 The actual harvested yield was obtained, converted to the yield per hectare, and the yield increase rate was calculated.

[0095] Observation of crop safety: The growth of rice was observed 15, 30, and 45 days after application. If there was phytotoxicity, the symptoms of phytotoxicity (growth inhibition, chlorosis, malformation) and the occurrence time were described in detail, and the changes in phytotoxicity and the time for complete recovery were observed during each investigation.

[0096] The calculation formulas are as follows:

[0097]

[0098]

[0099] Experimental results and analysis:

[0100] As can be seen from Table 6, 15 days after application, for the 20% fentrazamide·butachlor EC (2.5 + 17.5), the application rates of active ingredients were 500 and 400 g a.i. / hm 2 and for the 22% fentrazamide·pyrazosulfuron-ethyl OD (16 + 6), the application rates of active ingredients were 90 and 75 g a.i. / hm 2 showed a control efficacy of more than 80% against gramineous, broad-leaved weeds, and Cyperaceae, showing excellent herbicidal effects compared with the single-agent treatments.

[0101] Table 6 Experimental results of controlling weeds in paddy fields 15 days after application

[0102]

[0103] 45 days after application, for the 20% fentrazamide·butachlor EC (2.5 + 17.5), the application rates of active ingredients were 500 and 400 g a.i. / hm2 The total fresh weight control effects on weeds were 95.18% and 94.22% respectively; the application rates of the active ingredients of 22% metobenzuron·pyrazosulfuron-ethyl dispersible oil suspension concentrate (16+6) were 90 and 75 g a.i / hm 2 The total fresh weight control effects on weeds were 95.17% and 93.52% respectively, showing good persistence.

[0104] Table 7 Results of field trials on controlling weeds in paddy fields 45 days after application

[0105]

[0106]

[0107] During the rice harvest period, the yields of each treatment area in the experiment were measured. As shown in Table 8, the application rates of the active ingredients of 20% metobenzuron·butachlor emulsifiable concentrate (2.5+17.5) were 500 and 400 g a.i / hm 2 The converted rice yields were 8774 and 8519 kg / hm respectively 2 , with an increase of 12.24% and 8.98% respectively compared with the clear water control; the application rates of the active ingredients of 22% metobenzuron·pyrazosulfuron-ethyl dispersible oil suspension concentrate (16+6) were 90 and 75 g a.i / hm 2 The converted rice yields were 8611 and 8493 kg / hm respectively 2 , with an increase of 10.16% and 8.65% respectively compared with the clear water control.

[0108] Table 8 Results of the experiment on the effect of each treatment on rice yield

[0109]

[0110] Safety results: The growth of rice was observed 15, 30, and 45 days after application. No phytotoxicity phenomena such as growth inhibition, chlorosis, and deformity of rice were found in each chemical treatment.

[0111] Although the present invention has been described in detail with general descriptions and specific embodiments above, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection of the present invention.

Claims

1. A herbicidal composition containing benzobicyclon, characterized in that, The active ingredients of the described weeding composition comprise active ingredient A and active ingredient B. The active ingredient A is fentrazamide, and the active ingredient B is butachlor or pyrazosulfuron-ethyl. The mass ratio of the active ingredient A to the active ingredient B is 1:60 to 40:

1.

2. The herbicidal composition according to claim 1, wherein When the active ingredient B is butachlor, the mass ratio of fentrazamide to butachlor is 1:60 to 15:

1. When the active ingredient B is pyrazosulfuron-ethyl, the mass ratio of fentrazamide to pyrazosulfuron-ethyl is 1:16 to 30:

1.

3. The herbicidal composition according to claim 2, wherein When the active ingredient B is butachlor, the mass ratio of fentrazamide to butachlor is 1:60 to 4:

5. When the active ingredient B is pyrazosulfuron-ethyl, the mass ratio of fentrazamide to pyrazosulfuron-ethyl is 1:8 to 16:

1.

4. The herbicidal composition according to claim 1, wherein Based on 100 wt% of the total weight of the described weeding composition, the total weight of the active ingredient A and the active ingredient B accounts for 0.1% to 80% of the weeding composition. Preferably, the total weight of the active ingredient A and the active ingredient B accounts for 5% to 60% of the weeding composition.

5. The herbicidal composition according to claim 1, wherein In addition to the active ingredients, the described weeding composition also contains other auxiliary ingredients, which are selected from one or more of wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreezing agents, defoaming agents, solvents, preservatives, stabilizers, synergists or carriers.

6. The herbicidal composition according to claim 1, wherein The preparation dosage form of the described weeding composition is a solid preparation and / or a liquid preparation. Preferably, the solid preparation is a water dispersible granule or a wettable powder, and the liquid preparation is a suspension concentrate, an emulsifiable concentrate or a dispersible oil suspension.

7. Use of the weeding composition according to any one of claims 1-6 for controlling unwanted plants.

8. The application according to claim 7, wherein The unwanted plants are broadleaf, gramineous and / or cyperaceous weeds.

9. The application according to claim 7, wherein The growth sites of the unwanted plants are rice fields, wheat fields, barley fields, rye fields, rape fields, sugar beet fields, corn fields, turf, cotton fields, vegetable fields, sugarcane fields, soybean fields.

10. A method for controlling unwanted plants, characterized in that, It includes applying the weeding composition according to claim 1 to the unwanted plants or their growth sites.

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