WO2023079573A1 - Composition herbicide - Google Patents

Composition herbicide Download PDF

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Publication number
WO2023079573A1
WO2023079573A1 PCT/IN2022/050962 IN2022050962W WO2023079573A1 WO 2023079573 A1 WO2023079573 A1 WO 2023079573A1 IN 2022050962 W IN2022050962 W IN 2022050962W WO 2023079573 A1 WO2023079573 A1 WO 2023079573A1
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present
herbicidal composition
sodium
herbicide
range
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PCT/IN2022/050962
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English (en)
Inventor
Aminul Islam
Balram BHAVANI
Kiran Pawar
Rajul EDOLIYA
Rajan Kumar TRIVEDI
Sanket PATIL
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Coromandel International Limited
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Publication of WO2023079573A1 publication Critical patent/WO2023079573A1/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
    • A01P13/02—Herbicides; Algicides selective
    • 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
    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/72—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms
    • A01N43/80—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms five-membered rings with one nitrogen atom and either one oxygen atom or one sulfur atom in positions 1,2
    • 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
    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/90—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having two or more relevant hetero rings, condensed among themselves or with a common carbocyclic ring system

Definitions

  • the present invention relates to a herbicidal composition for protecting crops against weeds, undesired vegetation and grasses. More, particularly, the present invention relates to a herbicidal composition comprising a mixture of pyroxasulfone, diclosulam and chlorimuron ethyl. The present invention further relates to a method of controlling weeds comprising applying a composition of the present invention to the weeds or an area in need of weed control.
  • Weeds compete with productive crops or pasture, they can be poisonous, distasteful, produce burrs, thorns or otherwise interfere with the use and management of desirable plants by contaminating harvests or interfering with livestock.
  • Weeds compete with crops for space, nutrients, water and light. Smaller, slower growing seedlings are more susceptible than those that are larger and more vigorous.
  • Weeds also vary in their competitive abilities according to conditions and season.
  • Tall-growing vigorous weeds such as fat hen (Chenopodium album) can have the most pronounced effects on adjacent crops, although seedlings of fat hen that appear in late summer produce only small plants.
  • Chickweed Stellaria media
  • a low growing plant can suddenly co-exist with a tall crop during the summer, but plants that have overwintered will grow rapidly in early spring and may swamp crops such as onions or spring greens.
  • weeds do not necessarily mean that they are damaging a crop, especially during the early growth stages when both weeds and crops can grow without interference. However, as growth proceeds, they begin to require greater amounts of water and nutrients. Estimates suggest that weed and crop can co-exist harmoniously for around three weeks before competition becomes significant.
  • herbicides are typically categorized according to the time of application (e.g., pre-emergence or post-emergence herbicides). Preemergence herbicides are applied prior to germination of weeds for control of germinating weed seeds without harming the desired plant species. Postemergence herbicides are applied after planting and over the top of establishing or established plants for control of unwanted plant species.
  • the herbicidal effectiveness of a compound cannot be predicted from an examination of the substituent groups of the compound and often quite closely related compounds possess different weed control abilities.
  • Various herbicides of the same class of compounds may have complementary areas of activity and thus can be useful to control a variety of weeds upon application of a combination.
  • the various herbicides are not completely effective so as to control all the infesting weeds in a field crop, which necessitates the use of herbicidal combinations.
  • An ideal herbicide should afford selective weed control, over the full growing season, with a single administration. It should be able to control all common weeds by controlling their growth and reproduction as the seed, the germinating seed, the seedling and the growing weed plant. It is often imperative to use herbicidal combinations to achieve these advantages, although the selection of the components of an ideal combination is not a straightforward choice for a skilled artisan.
  • the present invention to provides a herbicidal composition, which allows efficient and reliable control of grass and broadleaf weeds in field with sufficiently long herbicidal activity in order to achieve control of the weeds over a sufficient long time period.
  • the composition of the present invention has low toxicity to humans or other mammals and show an accelerated action on harmful plants, i.e., they should affect damaging of the harmful plants more quickly in comparison with application of the individual herbicides.
  • the present invention provides a herbicidal composition
  • a herbicidal composition comprising a mixture of an isooxazoline herbicide, a triazolopyrimidine herbicide, a sulfonylurea herbicide and adjuvants, wherein the isooxazoline herbicide is pyroxasulfone, the triazolopyrimidine herbicide is diclosulam and the sulfonylurea herbicide is chlorimuron ethyl in effective amount and adjuvants.
  • the herbicidal composition comprises a mixture of pyroxasulfone is present in a range from 10% (w/w) to 30% (w/w); diclosulam is present in a range from 1.5% (w/w) to 5% (w/w); and chlorimuron ethyl is present in a range from 0.5% (w/w) to 1.5% (w/w).
  • the composition comprises the adjuvants selected from a wetting agent, a dispersing agent, a filler, a disintegration agent and a defoamer.
  • the composition comprise the wetting agent selected from the group comprising dialkyl naphthalene sulphonate sodium salt, alkylnaphthalene sulfonate condensate blend, sodium lauryl sulphate and linear alcohol derivative, present in a range from 2.5% to 5% w/w.
  • the composition comprises the dispersing agent selected from the group comprising Sodium salt of methyl naphthalene sulfonate, sodium ligno sulphonate, Polyethyleneglycol Nonylphenyl ether ammonium sulfate, acrylate copolymer, phenol sulfonic acid- formaldehyde -polycondensation as sodium salt, sodium polycarboxylate, and sodium methyl oleoyl taurate, or combination thereof, present in a range from 4% to 15% w/w.
  • the dispersing agent selected from the group comprising Sodium salt of methyl naphthalene sulfonate, sodium ligno sulphonate, Polyethyleneglycol Nonylphenyl ether ammonium sulfate, acrylate copolymer, phenol sulfonic acid- formaldehyde -polycondensation as sodium salt, sodium polycarboxylate, and sodium methyl oleoy
  • the composition comprises the filler selected from the group comprising com starch, lactose monohydrate, quartz, talc, kaolin, pyrophyllite, montmorillonite, attapulgite, bentonite clay, china clay, kieselguhr, chalk, zeolite, calcite, sericite, acid clay, diatomaceous earth, natural rock, Fuller’s earth, meerschaum, gibbsite, dolomite or pumice; synthetic minerals such as precipitated silica, fumed silica, sodium silicate, silicon dioxide, alumina, aluminium silicate, aluminium hydroxide and calcium carbonate, present in a range from 44% to 61% w/w.
  • the filler selected from the group comprising com starch, lactose monohydrate, quartz, talc, kaolin, pyrophyllite, montmorillonite, attapulgite, bentonite clay, china clay, kieselguhr, chalk, zeolite, calcite
  • the composition comprises the disintegration agent selected from the group comprising ammonium sulphate, sodium tripolyphosphate, sodium salt of naphthalene sulfonate and sodium polycarboxylate, present in an amount of 10% w/w.
  • the composition comprises the defoamer poly dimethyl siloxane, present in a range from 1% to 3% w/w.
  • the composition is formulated as water dispersible granule.
  • active ingredient refers to that component of the composition responsible for control of weeds, undesired vegetation and grasses.
  • % refers to % weight; and % weight refers to % of the weight of the respective component with respect to the total weight of the composition.
  • the term "effective amount” means the amount of the active substances in the compositions to achieve an observable effect on growth, including the effects of necrosis, death, retardation, prevention, and removal, destruction, or otherwise diminishing the occurrence and activity of the target weed.
  • the effective amount can vary for the various compositions used in the present invention.
  • An effective amount of the compositions will also vary according to the prevailing conditions such as desired herbicidal effect and duration, weather, target species, locus, mode of application, and the like.
  • plants, weeds and vegetation include germinant seeds, emerging seedlings, plants emerging from vegetative propagules and established vegetation.
  • controlling undesirable vegetation means preventing, reducing, killing, or otherwise adversely modifying the development of plants and vegetation. Described herein are methods of controlling undesirable vegetation through the application of certain herbicide combinations or compositions. Methods of application include, but are not limited to applications to the vegetation or locus thereof, e.g., application to the area adjacent to the vegetation, as well as pre-emergence, post-emergence, foliar (broadcast, directed, banded, spot, mechanical, over-the-top, or rescue), and in-water applications (emerged and submerged vegetation, broadcast, spot, mechanical, water-injected, granular broadcast, granular spot, shaker bottle or stream spray) via hand, backpack, machine, tractor, or aerial application methods.
  • applications to the vegetation or locus thereof e.g., application to the area adjacent to the vegetation, as well as pre-emergence, post-emergence, foliar (broadcast, directed, banded, spot, mechanical, over-the-top, or rescue), and in-water applications (emerged and submerged vegetation, broadcast, spot
  • Pyroxasulfone chemically known as 3-[5-(difluoromethoxy)-l-methyl-3- (trifluoromethyl) pyrazol-4-ylmethylsulfonyl]-4,5-dihydro-5,5-dimethyl-l,2- oxazole, is relatively new isooxazoline herbicide that inhibits synthesis of very - long- chain fatty acids.
  • the structure of the existing herbicide thiobencarb served as the basis for development but pyroxasulfone requires a lower dose (100- 25 g/ha) and is more stable resulting in longer efficacy.
  • Pyroxasulfone is used to control weeds among many agricultural crops including corn and soybean.
  • This herbicide is a different chemistry class - it is an isoxazoline. This means that pyroxasulfone brings more activity to a broader spectrum of small-seeded plants than other, older chemicals. Pyroxasulfone binds with clay in the soil which can make it more effective against weeds for longer.
  • the chemical structure of Pyroxasulfone is
  • Diclosulam chemically known as [N-(2,6-dichlorophenyl)-5-ethoxy-7- fluoro-(l,2,4)triazolo(l,5-c)pyrimidine-2-sulphonamide], belonging to the sulfonanilide triazolopyrimidine group, whose mechanism of action is the inhibition of acetolactate synthase (ALS), a key enzyme in branched chain amino acid biosynthesis of plants.
  • Diclosulam is a soil applied herbicide. It has a low aqueous solubility, is non-volatile and, based on its chemical properties, is mobile and may leach to groundwater. It tends to be moderately persistent in soil systems.
  • the structure of diclosulam is
  • Chlorimuron ethyl chemically known as [ethyl 2-(4-chloro-6- methoxypyrimidin-2-ylcarbamoylsulfmoyl) benzoate] is a sulfonylurea herbicide. Sulfonylurea herbicides function by interfering with the bio-synthesis of amino acids including valine, isoleucine and leucine. Chlorimuron ethyl is used to control weeds among agricultural crops including grains. Chlorimuron-ethyl is a post-emergence, foliar applied herbicide.
  • the herbicidal composition comprises of Pyroxasulfone present in a range from 10% to 30% (w/w), Diclosulam is present in a range from 1.5% to 5% (w/w), Chlorimuron ethyl is present in a range from 0.5% to 1.5% (w/w), and suitable adjuvants.
  • the herbicidal composition in addition to herbicidal actives further contains a support, an adjuvant and/or a surfactant.
  • a common adjuvant can be mixed with the composition.
  • the active compounds within the herbicidal composition according to the invention have potent weedicide activity and can be employed for controlling undesired weeds, vegetation and sedges.
  • Suitable adjuvants may be a solid or liquid and are generally a substance commonly used in formulation processing process, for example, wetting agent, dispersing agent, filler, disintegrating agent and defoamer.
  • the herbicidal composition of the present invention may further be mixed with other herbicidal active ingredients, whereby the spectrum of weeds to be controlled, the application timing, the herbicidal activity, etc. can be improved to preferred directions in some cases.
  • the novel herbicidal composition of the present invention may be formulated as Granular composition (GR), Capsule suspension (CS), Dispersible concentrate (DC), Dustable powder (DP), Powder for dry seed treatment (DS), Emulsifiable concentrate (EC), Emulsifiable granule (EG), Emulsion water-in-oil (EO), Emulsifiable powder (EP), Emulsion for seed treatment (ES), Emulsion oil- in-water (EW), Flowable concentrate for seed treatment (FS), Granules (GR), Micro-emulsion (ME), Oil-dispersion (OD), Oil miscible flowable concentrate (OF), Oil miscible liquid (OL), Oil dispersible powder (OP), Suspension concentrate (SC), Suspension concentrate for direct application (SD), Suspo- emulsion (SE), Water soluble granule (SG), Soluble concentrate (SL), Spreading oil (SO), Water soluble powder (SP), Water soluble tablet (ST), Ultra-low volume (ULV)
  • Wetting is the first stage of dispersion, in which the air surrounding the granular composition is substituted with water. Wetting of the herbicidal composition with water cannot occur if the surface tension of the liquid is very high. Hence, it is recommended to add a wetting agent to the herbicidal composition to facilitate the process of dispersion of the granules in the liquid.
  • the composition of the present invention preferably contains a wetting agent such as naphthalene alkyl aryl sulphonate, dioctyl sulfo succinate, sodium lauryl sulfate, non-ionic ethoxylated polyarylphenol phosphate ester, sodium alkyl naphthalene sulfonate or a combination thereof.
  • a wetting agent such as naphthalene alkyl aryl sulphonate, dioctyl sulfo succinate, sodium lauryl sulfate, non-ionic ethoxylated polyarylphenol phosphate ester, sodium alkyl naphthalene sulfonate or a combination thereof.
  • the wetting agent suitable for use in the present invention are dialkyl naphthalene sulphonate sodium salt, alkylnaphthalene sulfonate condensate blend, sodium lauryl sulphate and linear
  • the composition of the present invention preferably contains a dispersing agent such as amine salt of phosphate tristyryl phenol ethoxylated, acrylic copolymer, naphthalene sulphonate of formaldehyde condensate, lignin based sulphonate.
  • a dispersing agent such as amine salt of phosphate tristyryl phenol ethoxylated, acrylic copolymer, naphthalene sulphonate of formaldehyde condensate, lignin based sulphonate.
  • One or more dispersing agents may be used in the synergistic composition of the present invention.
  • the dispersing agent suitable for use in the present invention are Sodium salt of methyl naphthalene sulfonate, sodium ligno sulphonate, Polyethyleneglycol Nonylphenyl ether ammonium sulfate, acrylate copolymer, phenol sulfonic acid-formaldehyde- polycondensation as sodium salt, sodium polycarboxylate, sodium methyl oleoyl taurate and sodium lauryl sulphate or combination thereof.
  • Dispersing agent is present in a range from 4% to 15% (w/w) in the compositions of the present invention.
  • a “filler” refers to solid chemicals that are added to an herbicide formulation to aid in the delivery of the active ingredient.
  • Filler is selected from the group comprising of, but not limited to, natural minerals such as corn starch, lactose monohydrate, quartz, talc, kaolin, pyrophyllite, montmorillonite, attapulgite, bentonite clay, china clay, kieselguhr, chalk, zeolite, calcite, sericite, acid clay, diatomaceous earth, natural rock, Fuller’s earth, meerschaum, gibbsite, dolomite or pumice; synthetic minerals such as precipitated silica, fumed silica, sodium silicate, silicon dioxide, alumina, aluminium silicate, aluminium hydroxide; inorganic salts such as calcium carbonate, ammonium salts, sodium sulfate, potassium chloride.
  • the filler may be used alone or in combination thereof.
  • the filler suitable for use in the present invention are lactose
  • Disintegrating agent are additive that can be some time useful for improving dispersibility of herbicide formulation.
  • the disintegrating agent suitable for the purpose of the present invention is selected from the group comprising ammonium sulphate, sodium tripolyphosphate, sodium salt of naphthalene sulfonate and sodium polycarboxylate.
  • the disintegrating agent is present in an amount of 10% (w/w).
  • Defoamer is a chemical reagent developed for defoaming and foam suppression based on the principle of foaming.
  • the defoamer suitable for the purpose of the present invention is polydimethyl siloxane.
  • the defoamer is present in a range from 1% to 3% (w/w).
  • the synergistic herbicidal composition of the present invention was found to be non-phytotoxic and has good stability, wettability, suspensibility and dispersibility.
  • the herbicidal composition of the present invention may be applied to undesired plants, weeds or may be applied to a place where they grow. Further, it may be applied at any time either before or after the emergence of the undesired plants or weeds.
  • the herbicidal composition of the present invention may be applied in different application forms such as soil application, foliar application, irrigation application, and submerged application, and it can be applied to agricultural fields such as upland fields, orchards and paddy fields, and non-cropland such as ridges of fields, fallow fields, playgrounds, golf courses, vacant lands, forests, factory sites, railway sides and roadsides.
  • agricultural fields such as upland fields, orchards and paddy fields, and non-cropland such as ridges of fields, fallow fields, playgrounds, golf courses, vacant lands, forests, factory sites, railway sides and roadsides.
  • the composition comprises a combination of herbicides differing in the mode of action, it can control weeds having decreased sensitivity to many herbicides.
  • the herbicidal composition of the present invention may be mixed with or may be used in combination with other herbicides, fungicides, antibiotics, plant hormones, insecticides, fertilizers, phytotoxicity-reducing agents, etc., in addition to the above active ingredients, without departing from the intention and the scope of the present invention, whereby more excellent effects and activities may sometimes be obtained.
  • the herbicidal composition according to the invention can be applied before and after the plants have emerged, that is to say pre-emergence and postemergence. It can also be incorporated into the soil before sowing.
  • the good herbicidal activity of the herbicidal composition of the present invention can be seen from the examples which follow. While the individual active compounds show weak points regarding the herbicidal activity, the combinations, without exception, display a very good activity against weeds, which exceeds a simple additive effect. A synergistic effect in herbicides is always present when the herbicidal activity of the active combination exceeds the activity of the active compounds when applied individually.
  • Example 1 Preparation of composition of Pyroxasulfone, Diclosulam and Chlorimuron ethyl in Water Dispersible Granule form (WDG)
  • Step 1 weighing the raw materials according to the batch size as follows: a. filler b. dispersing agent c. wetting agent d. Pyroxasulfone e. Diclosulam f. Chlorimuron ethyl g. disintegrating agent h. defoamer weighing all this raw material in a pre-blender and mixing it for 1 hr;
  • Step 2 Milling the sample through air jet mill instrument at Inlet pressure 2-3 kg/cm 2 ’ grinding pressure 6 kg/ cm 2 and checking the particle size ⁇ 12 micron;
  • Step 3 Collecting the milled material, and post blending the sample for 1 hr;
  • Step 4 Extruding the granule @35 rpm (1.0 mesh);
  • Step 5 Collecting the granules and dry the sample at 45 °C for 30 min;
  • Step 6 Sending the sample to the Quality analysis
  • Step 7 Packing the formulated material in a suitable packaging.
  • Example 2 Compositions of the present invention
  • the illustrative embodiments show the composition of Pyroxasulfone, Diclosulam, and Chlorimuron ethyl in water dispersible granule form in different amount as follows:
  • composition of Table 1 The process for manufacture of composition of Table 1 is as follows: 30.0 gm of pyroxasulfone, 5.0 gm of diclosulam, 1.5 gm of chlorimuron ethyl, 2.5 gm of dialkyl naphthalene sulphonate sodium salt, 6.0 gm of sodium ligno sulfonate, 33.0 gm of com starch, 11.0 gm of china clay, 10.0 gm of ammonium sulphate, and 1.0 gm of poly dimethylsiloxane were weighed in the pre-blender reactor and mixed for 1 hour.
  • the mixture was milled through air jet mill instrument (Inlet pressure 2-3 kg/cm 2 , grinding pressure 6 kg/ cm 2 ) to obtain the desired particle size (D90 ⁇ 12 microns). Collecting the milled material and post blending the material for 1 hour. Extruding the granule at 35 rpm (1.0 mesh), collecting the granules and drying at 45 °C for 30 min followed by packing the material in a suitable package.
  • composition of Table 2 is as follows: 15.0 gm of pyroxasulfone, 1.5 gm of diclosulam, 0.5 gm of chlorimuron ethyl, 5.0 gm of Alkylnaphthalene sulfonate condensate blend, 3.0 gm of phenol sulfonic acid- formaldehyde -polycondensation as sodium salt, 1.0 gm of acrylate copolymer,
  • composition of Table 3 is as follows: 20.0 gm of pyroxasulfone, 2.0 gm of diclosulam, 1.0 gm of chlorimuron ethyl, 5.0 gm of Dialkyl naphthalene sulphonate sodium salt, 10.0 gm of Sodium salt of methyl naphthalene sulfonate, 5.0 gm of Phenol sulfonic acid-formaldehy depolycondensation as sodium salt, 10.0 gm of ammonium sulphate, 1.0 gm of polydimethylsiloxane, and 46.0 gm of calcium carbonate were weighed in the preblender reactor and mixed for 1 hour.
  • the mixture was milled through air jet mill instrument (Inlet pressure 2-3 kg/cm2, grinding pressure 6 kg/ cm2) to obtain the desired particle size (D90 ⁇ 12 microns). Collecting the milled material and post blending the material for 1 hour. Extruding the granule at 35 rpm (1.0 mesh), collecting the granules and dry at 45 °C for 30 min followed by packing the material in a suitable package.
  • composition of Table 4 is as follows: 25.0 gm of pyroxasulfone, 3.0 gm of diclosulam, 1.3 gm of chlorimuron ethyl, 4.5 gm of Linear Alcohol Derivative, 2.5 gm of Sodium polycarboxylate, 3.0 gm of Sodium Methyl Oleoyl Taurate, 2.5 gm of polydimethylsiloxane, 10.0 gm of ammonium sulphate, and 48.2 gm of calcium carbonate were weighed in the preblender reactor and mixed for 1 hour.
  • the mixture was milled through air jet mill instrument (Inlet pressure 2-3 kg/cm2, grinding pressure 6 kg/ cm2) to obtain the desired particle size (D90 ⁇ 12 microns). Collecting the milled material and post blending the material for 1 hour. Extruding the granule at 35 rpm (1.0 mesh), collecting the granules and dry at 45 °C for 30 min followed by packing the material in a suitable package.
  • composition of Table 5 is as follows: 10.0 gm of pyroxasulfone, 4.0 gm of diclosulam, 0.8 gm of chlorimuron ethyl, 5.0 gm of Polyethyleneglycol Nonylphenyl ether ammonium sulfate, 10.0 gm of Sodium Ligno sulphonate, 5.0 gm of Sodium lauryl sulphate, 10.0 gm of ammonium sulphate, and 55.2 gm of Lactose Monohydrate were weighed in the pre -blender reactor and mixed for 1 hour.
  • the mixture was milled through air jet mill instrument (Inlet pressure 2-3 kg/cm2, grinding pressure 6 kg/ cm2) to obtain the desired particle size (D90 ⁇ 12 microns). Collecting the milled material and post blending the material for 1 hour. Extruding the granule at 35 rpm (1.0 mesh), collecting the granules and dry at 45 °C for 30 min followed by packing the material in a suitable package.
  • Soybean is an important rainy season crop of India. In India, it is grown on an area of 108.83,000,000 ha with an annual production of 104.36,000,000 million tonnes. Successful weed control is most important factor for fruitful soybean production because losses due to weeds have been one of the major limiting factors in soybean production. Weeds compete with crop for light, moisture and nutrients. Being a rainy season crop soybean faces severe weed competition during crop growth, resulting in a loss of about 40-60% of the potential yield. Traditionally, weed control in India has been largely dependent on manual weeding. However, increased labour scarcity and costs are encouraging farmers to adopt to use herbicides.
  • weed control activity of the individual herbicides of the invention and their combinations were evaluated on weeds such as Acalypha indica, Commelina benghalensis, Commelina communis, Digera arvensis, Echinochloa colona and Dinebra retroflexa.
  • Trials were conducted with randomized block design with net plot size of 5m x 6m. Each trial was replicated four times and conducted under GEP guidelines. Spraying was done with manual operated backpack knapsack sprayer with 300 L of water spray volume per hectare at pre-emergence (0-2 DAS) application timing. Such field trials were carried out at various locations to generate independent data, the locations were chosen randomly across India.
  • Table 6 demonstrates synergy on weeds using the combination of Pyroxasulfone 30% + Diclosulam 5% + Chlorimuron ethyl 1.5% WDG. The field trials were carried out in India at various locations. The percentage efficacy was calculated after 30 days of application. The target weeds were Commelina benghalensis and Commelina communis and the results are recorded in the table 6 below.
  • Table 8 demonstrates synergy on weeds using the combination of Pyroxasulfone 30% + Diclosulam 5% + Chlorimuron ethyl 1.5% WDG. The field trials were carried out in India at various locations. The percentage efficacy was calculated after 30 days of application. The target weeds were Echinochloa colona and Dinebra retroflexa and the results are recorded in the table 8 below.
  • the herbicidal composition of the present invention is capable of controlling a wide range of undesired plants emerging in agricultural fields or non- agricultural fields. It has a remarkable herbicidal activity when a composition comprising Pyroxasulfone and Diclosulam, and Chlorimuron ethyl as a specific third herbicidally active ingredient are used in combination. It represents a synergistic effect i.e., a herbicidal effect higher than the mere addition of the herbicidal effect of the combination of Pyroxasulfone and Diclosulam and the herbicidal effect of the third herbicidally active ingredient.
  • the herbicidal composition of the present invention can be applied at a low dose as compared with a case where the respective active ingredients are applied individually. Thus, it is effective to reduce the environmental load on an area where the composition is applied or a surrounding area thereof.

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Abstract

La présente invention concerne une nouvelle composition herbicide pour protéger des cultures contre les mauvaises herbes, la végétation et les graminées parasites. Plus particulièrement, la présente invention concerne une composition herbicide comprenant un mélange de pyroxasulfone, de chlorimuron éthyle et de diclosulam. La présente invention concerne en outre un procédé de lutte contre les mauvaises herbes comprenant l'application d'une composition de la présente invention aux mauvaises herbes ou à une zone nécessitant une lutte contre les mauvaises herbes.
PCT/IN2022/050962 2021-11-02 2022-11-01 Composition herbicide WO2023079573A1 (fr)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
WO2004080173A2 (fr) * 2003-03-13 2004-09-23 Basf Aktiengesellschaft Melanges herbicides a action synergique
CA2716674A1 (fr) * 2008-03-10 2009-09-17 Basf Se Compositions herbicides comprenant de la pyroxasulfone
US20190045788A1 (en) * 2018-10-18 2019-02-14 Valent U.S.A., Corporation Water dispersible granule composition

Patent Citations (3)

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CA2716674A1 (fr) * 2008-03-10 2009-09-17 Basf Se Compositions herbicides comprenant de la pyroxasulfone
US20190045788A1 (en) * 2018-10-18 2019-02-14 Valent U.S.A., Corporation Water dispersible granule composition

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