WO2022118272A1 - Composition herbicide synergétique ternaire - Google Patents

Composition herbicide synergétique ternaire Download PDF

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Publication number
WO2022118272A1
WO2022118272A1 PCT/IB2021/061290 IB2021061290W WO2022118272A1 WO 2022118272 A1 WO2022118272 A1 WO 2022118272A1 IB 2021061290 W IB2021061290 W IB 2021061290W WO 2022118272 A1 WO2022118272 A1 WO 2022118272A1
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Prior art keywords
composition
ethyl
herbicide composition
amount
alkyl
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PCT/IB2021/061290
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English (en)
Inventor
Kendappa GOWDRA NANJAPPA
Shivappa AGADI
Rupak PAUL
Vijay Kumar Reddy
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Rallis India Limited
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Publication of WO2022118272A1 publication Critical patent/WO2022118272A1/fr

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01P—BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
    • A01P13/00—Herbicides; Algicides
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N37/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids
    • A01N37/18—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing the group —CO—N<, e.g. carboxylic acid amides or imides; Thio analogues thereof
    • A01N37/22—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids containing the group —CO—N<, e.g. carboxylic acid amides or imides; Thio analogues thereof the nitrogen atom being directly attached to an aromatic ring system, e.g. anilides
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N47/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid
    • A01N47/08—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having one or more single bonds to nitrogen atoms
    • A01N47/28—Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N<
    • A01N47/36—Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N< containing the group >N—CO—N< directly attached to at least one heterocyclic ring; Thio analogues thereof

Definitions

  • the present disclosure pertains to technical field of agrochemicals. More specifically, the present disclosure pertains to a herbicidal synergistic composition comprising mixture of three herbicides, formulation thereof and to a method of controlling undesired vegetation in crops of useful plants.
  • Pretilachlor, pyrazosulfuron-ethyl and chlorimuron are compounds known to be herbicidally active and to be of use in the control of undesirable vegetation, for example in the protection of a range of crops.
  • the herbicides pretilachlor, pyrazosulfuron-ethyl and chlorimuron are independently known in the art for their herbicidal potency. They are disclosed in ‘The Pesticide Manual’ 15 th Edition, published 2009 by the British Crop Protection Council, and are also commercially available.
  • pretilachlor pyrazosulfuron-ethyl and chlorimuron are herbicidally active, in many cases they do not provide sufficient control of relevant harmful plants and their activities at low application rates are not always satisfactory.
  • the recommended level of herbicide that may be applied per unit of area is under pressure from governmental, as well as for economic and environmental reasons.
  • the present invention satisfies the existing needs, as well as others, and generally overcomes the deficiencies found in the prior art.
  • the present disclosure provides a synergistic herbicidal composition for selective control of undesirable vegetation in crops of agriculturally useful plants.
  • the present disclosure is based upon a surprising finding that pretilachlor, pyrazosulfuron-ethyl and chlorimuron display a synergistic herbicidal effect in the control of undesirable vegetation when applied in combination, for example in a composition comprising all three compounds.
  • the synergistic effects allow a reduction in application rate of individual active ingredients, a faster onset of herbicidal action, a longer-lasting action, better control of undesirable vegetation with only one or a few applications, and a broadening of possible application period.
  • the herbicide composition of the present disclosure includes a herbicidally effective amount of the active ingredients pretilachlor, pyrazosulfuron-ethyl and chlorimuron, and may include further constituents, for example customary auxiliary additives like inert formulation auxiliaries and/or agrochemical active compounds.
  • the active ingredient chlorimuron can be selected from chlorimuron and its agriculturally acceptable derivatives.
  • the active ingredient chlorimuron is chlorimuron-ethyl.
  • the present disclosure provides a herbicide composition
  • a herbicide composition comprising a herbicidally effective amount of the active ingredients pretilachlor, pyrazosulfuron-ethyl and chlorimuron-ethyl, and auxiliary additives.
  • the herbicide combination can exist as mixed formulations of pretilachlor, pyrazosulfuron-ethyl and chlorimuron-ethyl, which can then be used in a conventional way diluted with water, or be prepared as tank mixes by jointly diluting separately formulated or partially separately formulated active ingredients with water or with aqueous solutions.
  • the herbicide combination described herein can be formulated in a number of ways for suitable application.
  • suitable formulations include water-dispersible granules (WDG or WG), water-soluble granules (SG), wettable powder (WP), water-dispersible powder (WDP), water-soluble powder (SP), granules (GR), encapsulated granules (CG), fine granules (FG), macrogranules (GG), microgranules (MG), suspension concentrate (SC), water-soluble concentrate (SL), emulsifiable concentrate (EC), emulsion (EW), micro-emulsion (ME), oil-based suspension concentrate (OD), flowable suspension (FS), suspoemulsion (SE) and microencapsulated suspension (CS).
  • WDG or WG water-dispersible granules
  • SG water-soluble granules
  • WP wettable powder
  • WDP water-dispersible powder
  • SP water-soluble powder
  • GR
  • the herbicide composition according to the present disclosure is suitable for selectively controlling undesirable vegetation in cereal crops, preferably rice, and more preferably transplanted rice. Further, the herbicide composition according to the present disclosure can exhibit a synergistic herbicidal activity against a broad spectrum of economically important weeds, including broadleaf, sedge and grass weeds.
  • the broadleaf weeds that can be controlled by the herbicide composition of the present invention include without any limitation Eclipta alba, Ludwigia spp ,Monochoria vaginalis, Alternanthera sessilis, Commelina sp., and Amaranthus viridis or the like.
  • the sedges can be controlled by the herbicide composition of the present disclosure include without limitation Cyperus iria, C. Diformis, C.rotundus or the like.
  • the grasses can be controlled by the herbicide composition of the present disclosure include without limitation Ec/nwcAtoa crus-galli, Echinochl&a colona, Leptochloa chinensis, Ischaemum rugosum, Digitaria spp, Panicum spp or the like.
  • the herbicide composition according to the present disclosure is suitable for all application methods conventionally used in agriculture, for example pre-emergence application and early post-emergence application.
  • the present disclosure further provides a process for preparing the herbicide composition described herein.
  • the herbicide composition can be prepared by mixing the respective active compounds and, if appropriate, one or more formulation auxiliaries.
  • the numbers expressing quantities of ingredients, properties such as concentration, process conditions, and so forth, used to describe and claim certain embodiments of the invention are to be understood as being modified in some instances by the term “about.” Accordingly, in some embodiments, the numerical parameters set forth in the written description are approximations that can vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of some embodiments of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as practicable.
  • herbicide refers to a compound that controls growth of undesirable vegetation.
  • herbicidally effective amount refers to quantity of such a compound or combination of such compounds that is capable of producing a controlling effect on growth of undesirable vegetation.
  • locus includes not only areas where weeds may already be growing, but also areas where weeds have yet to emerge, and also areas under cultivation.
  • plant refers to all physical parts of a plant, including shoots, leaves, needles, stalks, stems, fruit bodies, fruits, seeds, roots, tubers and rhizomes.
  • auxiliary additives include inert formulation auxiliaries.
  • auxiliary additives can include adjuvants.
  • formulation auxiliaries means auxiliaries which are known and accepted in the art for formation of formulations for agricultural or horticultural use.
  • formulation auxiliaries means and can be used interchangeably with agrochemically acceptable excipients.
  • pre-emergence refers to application of the herbicide composition to a habitat, a weed, or soil, prior to emergence of weeds from a soil surface.
  • early post-emergence refers to application of the herbicide composition to weeds that have just emerged from a soil surface.
  • the present disclosure provides a herbicide composition comprising combination of pretilachlor, pyrazosulfuron-ethyl and chlorimuron. It has surprisingly been found that pretilachlor, pyrazosulfuron-ethyl and chlorimuron display a synergistic herbicidal effect in the control of undesirable vegetation when applied in combination, for example in a composition comprising all three compounds.
  • the present disclosure provides a herbicide composition
  • a herbicide composition comprising a herbicidally effective amount of the active ingredients pretilachlor, pyrazosulfuron-ethyl and chlorimuron, and auxiliary additives.
  • the active ingredient chlorimuron can be selected from chlorimuron and its agriculturally acceptable derivatives.
  • the active ingredient chlorimuron is chlorimuron- ethyl.
  • the present disclosure provides a herbicide composition
  • a herbicide composition comprising a herbicidally effective amount of the active ingredients pretilachlor, pyrazosulfuron-ethyl and chlorimuron-ethyl, and one or more auxiliary additives.
  • the active ingredients pretilachlor, pyrazosulfuron-ethyl and chlorimuron may be present in the composition of the present disclosure in a wide range of amounts.
  • the total amount of pretilachlor, pyrazosulfuron-ethyl and chlorimuron in the composition can range from about 0.1% to about 95% by weight of the composition.
  • pretilachlor can be present in the composition in amount by weight from about 0.01% to about 40%, preferably from about 0.05% to about 35%, more preferably from 0.1% to about 30%.
  • pyrazosulfuron-ethyl can be present in the composition in amount by weight from about 0.01% to about 40%, preferably from about 0.05% to about 35% of pyrazosulfuron-ethyl, more preferably from about 0.1% to about 30%.
  • chlorimuron-ethyl or its agriculturally acceptable derivatives can be present in the composition in amount by weight from about 0.01% to about 30%, preferably from 0.05% to about 25%, more preferably from about 0.07% to about 20%.
  • the composition comprises, by weight, from about 0.01% to about 40% of pretilachlor, from about 0.01% to about 40% of pyrazosulfuron-ethyl and from about 0.01% to about 30% of chlorimuron-ethyl or its agriculturally acceptable derivatives.
  • the composition comprises, by weight, from about 0.05% to about 35% of pretilachlor, from about 0.05% to about 35% of pyrazosulfuron-ethyl and from about 0.05% to about 25% of chlorimuron-ethyl or its agriculturally acceptable derivatives.
  • the composition comprises, by weight, from about 0.1% to about 30% of pretilachlor, from about 0.1% to about 30% of pyrazosulfuron-ethyl and from about 0.07% to about 20% of chlorimuron-ethyl or its agriculturally acceptable derivatives.
  • the herbicide composition of the present disclosure can be formulated by mixing pretilachlor, pyrazosulfuron-ethyl and chlorimuron with one or more formulation auxiliaries.
  • Suitable auxiliary additives will depend upon such factors as the type of formulation and the manner of the end use of the formulation, and will be known to a person skilled in the art.
  • the one or more auxiliary additives are selected from without limitation inert carriers, solvents, anti-foaming agents, dispersing agents, wetting agents, stabilizing agents, anti-caking agents, buffering agents, surfactants, emulsifiers, pH stabilizer, anti-freezing agents, binding agents, antioxidants, colorants, and thickeners.
  • the herbicide composition may comprise one or more inert carriers.
  • suitable inert carrier(s) for use in the composition include, but not limited to, natural ground minerals, such as kaolin or china clay, alumina, talc, chalk, quartz, attapulgite, montmorillonite, and diatomaceous earth, or synthetic ground minerals, such as highly dispersed silicic acid, aluminium oxide, silicates, and calcium phosphates and calcium hydrogen phosphates, or combinations thereof.
  • Suitable inert carrier(s) for granules include, for example, crushed and fractionated natural minerals, such as calcite, marble, pumice, sepiolite, bentonite, river sand, zeolites, starch, sand, talc, quartz and dolomite, or synthetic granules of inorganic and organic ground materials, as well as granules of organic material, such as sawdust, coconut husks, com cobs, and tobacco stalks, or combinations thereof.
  • the inert carrier may be used in an amount of from about 0.01% to about 99%, preferably from about 0.1% to about 95% by weight of the composition.
  • the dispersing agent can be selected from lignosulphonates, sodium lignosulfonate, phenyl naphthalene sulphonates, ethoxylated alkyl phenols, ethoxylated fatty acids, alkoxylated linear alcohols, polyaromatic sulfonates, sodium alkyl aryl sulfonates, maleic anhydride copolymers, phosphate esters, condensation products of aryl/alkyl sulphonic acids and formaldehyde, addition products of ethylene oxide and fatty acid esters, sulfonates of condensed naphthalene, lignin derivatives, naphthalene formaldehyde condensates, polycarboxylates, sodium alkyl benzene sulfonates, salts of sulfonated naphthalene, ammonium salts of sulfonated naphthalene
  • the wetting agent can be selected from alkyl phenol ethoxylate, fatty oil ethoxylate, phenyl naphthalene sulphonates, alkyl naphthalene sulfonates, sodium salt of alkyl naphthalene sulfonate, sodium salt of sulfonated alkyl carboxylate, polyoxyalkylated ethyl phenols, polyoxyethoxylated fatty alcohols, polyoxyethoxylated fatty amines, lignin derivatives, alkane sulfonates, alkylbenzene sulfonates, salts of polycarboxylic acids, salts of esters of sulfosuccinic acid, alkylnaphthalenesulfonates, alkylbenzenesulfonates, alkylpolyglycol ether sulfonates, alkyl ether phosphates,
  • the stabilizing agent can be selected from modified hydrophobic silica, colloidal silica, precipitated silica, hydrophobic silica powder and mixtures thereof.
  • the stabilizing agent is dimethyldichlorosilane-treated fumed silica.
  • the stabilizing agent can be selected from epoxidized soybean oil, gamma butyrolactone, butylated hydroxyl toluene and its derivatives, epichlorhydrin, quinone derivatives, hydrazine hydrates and its derivatives, general class UV stabilizers, glycols and its derivatives or combinations thereof.
  • the stabilizing agent may be used in an amount of from about 0.01% to about 10% by weight, preferably from about 0.01% to about 5% by weight based on a total weight of the composition.
  • the anti-caking agent can be selected from kaolin clay, precipitate silica, colloidal silica, fumed silica, talc, gypsum, silicates, calcium carbonate, magnesium carbonate, magnesium sulfate, or combinations thereof.
  • the anticaking agent may be used in an amount of from about 0% to about 10%, preferably from about 0% to about 5% by weight of the composition.
  • the binding agent can be selected from polyvinyl pyrrolidone (PVP), polyvinyl alcohol, sodium bentonite, ethyl cellulose, microcrystalline cellulose, carboxymethyl cellulose, lactose, lignin or starch and the mixture thereof.
  • PVP polyvinyl pyrrolidone
  • the binding agent is present in an amount of from about 0.01% to about 10%, preferably from about 0.01% to about 5% by weight of the composition.
  • the buffering agent can be selected from H + bentonite, calcium bentonite, sodium bentonite, H + hectorite, calcium hectorite, sodium hectorite or combinations thereof.
  • the buffering agent is present in an amount of from about 0% to about 10%, preferably from about 0% to about 5% by weight of the composition.
  • Suitable anti-foaming agents for use in the composition include all substances which can normally be used for this purpose in agrochemical compositions. Particularly preferred anti-foaming agents are mixtures of polydimethylsiloxanes and perfluroalkylphosphonic acids, such as the silicone anti-foaming agents available from GE or Compton.
  • the anti-foaming agent may be used in an amount of from about 0% to about 6%, preferably from about 0% to about 3% by weight of the composition.
  • Suitable solvents for use in the composition may be selected from all customary organic solvents which dissolve one or more of the active ingredients employed.
  • Suitable organic solvents for the compounds pretilachlor, pyrazosulfuron-ethyl and chlorimuron are known in the art.
  • Preferred solvent include, but not limited to, deionized (DI) water, water immiscible solvent, vegetable oils, methylated vegetable oil and paraffin oil.
  • Water immiscible solvent can be selected from but not limiting to aromatic hydrocarbon, solvent naphtha (heavy, medium, light), turpentine oil, Pine oil, Pseudocumene (1,2,4- trimethylbenzene) and blends thereof; (b) high HLB emulsifier: ethoxylated branched Cl l- 14, C13-rich alcohols or combinations thereof. Solvents may present in the composition in an amount ranging from about 0.01 to about 20%, preferably from about 0.1% to about 10% by weight of the composition.
  • Suitable pH stabilizer can be selected from without limitation trisodium citrate, trisodium phosphate, tripotassium phosphate, triethanol amine, triethyl amine, ammonioum hydroxide, magnesium carbonate, magnesium sulphate, sodium bentonite, china clay, attapulgite, and diatomaceous earth or combination thereof.
  • the pH stabilizer is used to adjust the pH ranging from about 8.0 - 10.0.
  • the pH stabilizer may present in the composition in an amount ranging from about 0.01 to about 70%, preferably from about 0. 1% to about 50% by weight of the composition
  • Suitable antioxidants are all substances which can normally be used for this purpose in agrochemical compositions, as is known in the art.
  • Preferred antioxidant is butylated hydroxy toluene.
  • Antioxidant may present in the composition in an amount ranging from about 0 to about 10%, preferably from about 0% to about 5% by weight of the composition.
  • Suitable thickeners for use in the composition include all substances which can normally be used for this purpose in agrochemical compositions. Examples include xanthan gum, polyvinyl alcohol, cellulose and its derivatives, hydrated clay minerals, magnesium aluminium silicates or combinations thereof. Thickener may present in the composition in an amount ranging from about 0 to about 10%, preferably from about 0% to about 5% by weight of the composition.
  • Suitable anti-freezing agents include organic solvents which are completely miscible with water, such as ethylene glycol, propylene glycol, other glycols, glycerine, urea or combinations thereof.
  • Anti-freezing agent may present in the composition in an amount ranging from about 0 to about 15%, preferably from about 0% to about 10% by weight of the composition.
  • Suitable surfactants or emulsifiers for use in the composition include all substances which can normally be used for this purpose in agrochemical compositions. Examples include substances which are non-ionic, cationic and/or anionic in nature. Suitable surfactants or emulsifiers can be selected from but not limited to, ethoxylated fatty alcohol (Atlox TM 4991 also known as Polyoxyethylene alkyl ether), salts of polyacrylic acids, salts of lignosulphonic acid, salts of phenylsulphonic or naphthalenesulphonic acids, polycondensates of ethylene oxide with fatty alcohols or with fatty acids or with fatty amines, substituted phenols, especially alkylphenols, sulphosuccinic ester salts, taurine derivatives, especially alkyl taurates, and phosphoric esters of polyethoxylated phenols or alcohols. Surfactant may present in the composition in an amount ranging from about 0.01 to
  • the presence of at least one surfactant or emulsifier is generally required when the active ingredient(s) and/or the auxiliary additives are insoluble in water and the vehicle for the final application of the composition is water.
  • the disclosed herbicide composition can additionally include one or more further agrochemical active compounds, such as insecticides, nematicides, fungicides, safeners, growth factor enhancers and fertilizers, in addition to the components pretilachlor, pyrazosulfuron-ethyl and chlorimuron.
  • agrochemical active compounds such as insecticides, nematicides, fungicides, safeners, growth factor enhancers and fertilizers, in addition to the components pretilachlor, pyrazosulfuron-ethyl and chlorimuron.
  • composition of the present disclosure can be provided as a formulation.
  • composition of the present disclosure can used in a conventional way diluted with water.
  • present disclosure provides a tank mix comprising separately formulated or partially separately formulated pretilachlor, pyrazosulfuron-ethyl and chlorimuron-ethyl.
  • the present disclosure provides formulations comprising the herbicide composition of the present invention.
  • the present disclosure provides a formulation comprising a herbicidally effective amount of the active ingredients pretilachlor, pyrazosulfuron-ethyl and chlorimuron-ethyl, and one or more auxiliary additives, wherein the ratio of pretilachlor : pyrazosulfuron-ethyl : chlorimuron is ranges from about 1 : 0.001 : 0.0001 to about 10 : 8: 4, preferably from about 1 : 0.01 : 0.001 to about 5 : 4 : 1.8.
  • Formulations can be in liquid or solid form.
  • the disclosed formulations comprising the herbicide composition can be without limitation water- dispersible granule (WDG or WG), a water-soluble granule (SG), a wettable powder (WP), a water-dispersible powder (WDP), a water-soluble powder (SP), a granule (GR), an encapsulated granule (CG), a fine granule (FG), a macrogranule (GG), a microgranule (MG), a suspension concentrate (SC), a water-soluble concentrate (SL), an emulsifiable concentrate (EC), an emulsion (EW), a micro-emulsion (ME), an oil-based suspension concentrate (OD), a flowable suspension (FS), a suspoemulsion (SE), or a microencapsulated suspension (CS).
  • WDG or WG water- dispersible granule
  • SG water-soluble granule
  • WP wettable powder
  • the present disclosure further provides a process for preparing the formulation comprising the herbicide composition described herein.
  • the formulation can be prepared by mixing and/or grinding the respective active compounds and, if appropriate, one or more auxiliary additives.
  • the synergistic effects of the combination of pretilachlor, pyrazosulfuron-ethyl and chlorimuron can provide one or more of a number of advantages over the use of each active ingredient alone.
  • the rates of application of each active ingredient can be markedly reduced, when the three compounds are used in combination, while maintaining a high level of herbicidal efficacy.
  • the use of the combination of pretilachlor, pyrazosulfuron-ethyl and chlorimuron has the potential to control weed species at a low application rate, in particular at a rate of application at which the individual active ingredients alone are ineffective.
  • a treatment using the combination of pretilachlor, pyrazosulfuron-ethyl and chlorimuron can exhibit a considerably broader weed spectrum than the compounds when used alone.
  • the use of a composition comprising the three aforementioned active ingredients also has a speed of action which is faster than that which would have been predicted from the speed of each ingredient used individually.
  • the herbicide composition of the present disclosure is useful for both preemergence and early post-emergence control of undesirable vegetation.
  • undesirable vegetation denotes non-crop plant species that otherwise tend to grow in areas where crops are planted, and includes both volunteer crops and weeds.
  • control of undesirable vegetation refers to interference with normal growth and development of undesired vegetation. Examples of control activity include, but not limited to, inhibition of root growth, inhibition of shoot growth, inhibition of shoot emergence, inhibition of seed production, or reduction of weed bio mass.
  • the undesirable vegetation whose control is of greatest interest in the practice of present invention are weeds, and primarily those weeds associated with common crops such as rice, preferably transplanted rice.
  • the control of undesirable vegetation in such crops may be achieved by applying to the undesirable vegetation or to locus of the vegetation the combination of pretilachlor, pyrazosulfuron-ethyl and chlorimuron in suitable amounts.
  • the present disclosure provides a method of controlling undesirable vegetation in crops of useful plants, which comprises allowing a herbicidally active amount of a composition according to the present disclosure to act on the crop plant or its environment.
  • the method of controlling undesirable vegetation in crops of useful plants comprises treating the undesirable vegetation in crops of useful plants with the composition or tank mix or formulation of the present disclosure, by applying the same at a rate which corresponds to a total amount of 0.05 to 6 kg of active ingredient per hectare.
  • the herbicide composition according to the present disclosure is particularly advantageous in the protection of cereals, more preferably rice crops.
  • the herbicide composition according to the present disclosure can exhibit a synergistic herbicidal activity against a broad spectrum of economically important weeds, including broadleaf, sedge and grass weeds.
  • the disclosed herbicide composition comprising combination of pretilachlor, pyrazosulfuron-ethyl and chlorimuron-ethyl can be applied in a variety of ways known to those skilled in the art, at various concentrations.
  • the herbicide composition of the present disclosure is useful in controlling growth of undesirable vegetation by pre-emergence and/or early post-emergence application to undesirable vegetation and/or locus thereof where control is desired.
  • the herbicide composition may be applied to undesirable vegetation and/or locus thereof by broadcasting with sand.
  • effective herbicidal effects can be achieved with both pre-emergence application and early post-emergence application of the herbicide composition of the present disclosure.
  • Useful methods of application include broadcasting.
  • the application rates of the herbicide composition to soil can vary over a wide range. The optimal application rates will depend on the crop to be protected, the stage of growth of the crop and of the weed, and the manner in which application is made..
  • the total application rate of pretilachlor, pyrazosulfuron-ethyl and chlorimuron can vary within a wide range, for example from 1 to 2000g per hectare (g/ha). Preferably, the application rate ranges from 2 to 1000 g/ha.
  • the herbicide composition disclosed herein may be applied in a single treatment or in several treatments (sequential application), for example one or more pre-emergence applications, followed by one or more early post-emergence applications, While the foregoing description discloses various embodiments of the disclosure, other and further embodiments of the invention may be devised without departing from the basic scope of the disclosure.
  • the invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.
  • An aqueous tank mix was prepared by mixing Pretilachlor 50% EC, Pyrazosulfuron-ethyl 10% WP, Chlorimuron-ethyl 25% WP, and water at room temperature.
  • the tank mix composition comprising the herbicide combination was tested for its biological activity and the results are shown in Tables 1 & 2 below: Table-1: Field Test Results of the Combination of Pretilachlor, Pyrazosulfuron-ethyl and Chlorimuron-ethyl applied (as pre-emergent) at 2 DAP 1 for weed control in transplanted rice
  • DAA Days after application Table-2: Field Test Results of the Combination of Pretilachlor, Pyrazosulfuron-ethyl and Chlorimuron-ethyl applied (as pre-emergent) at 2 DAP1 for weed control in transplanted rice (% Weed control relative to untreated check)
  • the present herbicide combination applied in a single treatment to the transplanted rice crop kills substantially all of the weeds, thereby avoiding a need for successive treatments. It is also evident that the combination preparation in accordance with the present invention exhibits a superior herbicidal effect as compared to other known herbicidal products available in the market.
  • Granular (GR) Formulations [0095] Granular (GR) formulations were prepared as per compositions provided in Table
  • Step 1 Preparation of emulsion part:
  • Step 2 Preparation of milled powder part:
  • a dough maker was charged with emulsion part into and previously prepared milled powder part, to which demineralized water was added to form a smooth dough.
  • the dough was extruded through a basket extruder and the granules obtained were dried in a fluid bed drier (FBD) to obtain granular formulations (GR).
  • BFD fluid bed drier
  • Step 2 Preparation of milled powder part:
  • a dough maker was charged with emulsion part into and previously prepared milled powder part, to which demineralized water was added to form a smooth dough.
  • the dough was extruded through a basket extruder and the granules obtained were dried in a fluid bed drier (FBD) to obtain water dispersible granules (WG).
  • BFD fluid bed drier
  • the GR formulation obtained as per Example 2 was subjected to Accelerated Storage test.
  • the “accelerated storage test” is considered as an indicative of product stability. That is accelerated storage test data provides an indication that the product is stable for at least two years at ambient temperature. Further, the FAO/WHO manual indicates storage at 54°C ⁇ 2°C for 14 days as the default test conditions.
  • the “ambient sample” is the sample at the room temperature which is before subjecting to the accelerated storage tests at 54 ⁇ 2°C for 14 days.
  • the “accelerated storage sample” is the sample after subjecting to the accelerated storage test.
  • Table 5 shows the physical and chemical properties of the GR formulation of Example 2 before and after the accelerated storage test
  • the content of chlorimuron-ethyl, pyrazosulfuron-ethyl and pretilachlor is found to be 0.10% w/w, 0.30% w/w, 9.0% w/w respectively before subjecting the ambient sample to the accelerated storage test.
  • the content of chlorimuron-ethyl, pyrazosulfuron-ethyl and pretilachlor is found to be almost same, that is 0.099%w/w, 0.30%w/w, 8.98%w/w respectively.
  • Moisture content test showed low moisture content of 0.20% indicating dried granules.
  • Dustiness test showed no dust generation (nil) indicating no dust formation during, handling, transportation and storage.
  • Attrition resistance showed high attrition resistance of 99.60% w/wand 99.62% w/w of granules indicating no breakage of granules during transport.
  • Table 7 The result in terms of percent reduction over the untreated check (UTC) iii) Effect of GR formulation of Example 2 against major weeds in Kharif rice field in Ponnuru, Andra Pradesh, in 2021 Date of transplanting: 02/03/2021
  • Table 8 The result in terms of reduction in mean no of weeds iv) Effect of GR formulation of Example 2 against major weeds in Kharif rice field in Ponnuru, Andra Pradesh, in 2021
  • Table 10 The result in terms of reduction in mean no of weeds. vi) Effect of GR formulation of Example 2 against major weeds in Kharif rice field in Dhamtari,Chhatisgarh, in 2021 Date of transplanting: 02/08/2021
  • Table 11 The result in terms of percent reduction over the untreated check (UTC).

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Zoology (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Pest Control & Pesticides (AREA)
  • Plant Pathology (AREA)
  • Agronomy & Crop Science (AREA)
  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

La présente divulgation concerne une composition herbicide synergétique et des formulations comprenant une combinaison de prétilachlore, de pyrazosulfuron-éthyle et de chlorimuron. La composition herbicide ternaire convient pour la régulation sélective de la végétation indésirable dans les cultures de plantes utiles en agriculture et fait preuve d'une activité herbicide synergétique contre un large spectre d'adventices économiquement importants, comprenant les adventices à larges feuilles, le carex et les graminées.
PCT/IB2021/061290 2020-12-04 2021-12-03 Composition herbicide synergétique ternaire WO2022118272A1 (fr)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IN2015DE02667A (fr) * 2015-08-27 2017-03-03 Willowood Chemicals Private Limited
IN201711011432A (fr) * 2017-03-30 2018-10-05 Willowood Chemicals Private Limited

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IN2015DE02667A (fr) * 2015-08-27 2017-03-03 Willowood Chemicals Private Limited
IN201711011432A (fr) * 2017-03-30 2018-10-05 Willowood Chemicals Private Limited

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