A herbicidal combination

Abstract

The present disclosure relates to a herbicidal combination comprising a carbamate herbicide and a chlorotriazine herbicide.

Description

[0001] A HERBICIDAL COMBINATION

[0002] FIELD OF THE DISCLOSURE:

[0003] The present disclosure relates to a herbicidal combination comprising a carbamate herbicide and a chlorotriazine herbicide. Furthermore, the present disclosure relates to a method for controlling weeds by applying an effective amount of the herbicidal combination thereof.

[0004] BACKGROUND OF THE DISCLOSURE:

[0005] Herbicides are chemical substances, which are used to control unwanted plants / weeds. The mode of action for herbicides is a biochemical or a physical mechanism, which disrupts or alters one or more of the metabolic processes of the unwanted plants / weed, thereby controlling their growth. Therefore, when and how any herbicide should be applied may be determined by the mode of action of the herbicide.

[0006] Furthermore, there are certain species or groups of unwanted plants / weeds, which are susceptible to certain herbicides and not susceptible to certain herbicides. This may be because either the herbicides use different biochemical pathways, or the herbicides have slightly different enzymes. In situations, when one herbicide is ineffective, additional herbicide(s) with different modes of action may provide better results.

[0007] Asulam, also known as methyl A-(4-aminophenyl)sulfonylcarbamate), is a broadspectrum carbamate herbicide. Asulam is a plant growth inhibitor which inhibits folate synthesis by suppression of dihydropteroate synthase (DHPS) in plants. The structure of asulam is represented as:

[0008]

[0009] Asulam is especially useful for post-emergence control of perennial grasses in crops such as sugarcane, soybean, cotton, etc. It provides effective control for a wide variety of herbicide-resistant and herbicide-tolerant weeds while reducing phyto toxicity in crops.

[0010] Terbuthylazine (also called as terbutylazine) is a pre-emergence and postemergence herbicide for the control of annual broadleaf weeds and partially of grasses. Terbuthylazine is a photosynthesis inhibitor, particularly photosystem II inhibitor and its mode of action is to inhibit the Hill reaction and CO2 sorption in the photosynthesis.

[0011] Furthermore, herbicidal combinations known in the art usually have some disadvantages. They have none or insufficient herbicidal activity against specific unwanted plants / weeds, the spectrum of unwanted plants / weeds which can be controlled with the herbicides is not broad enough, the selectivity and compatibility of the herbicides with crops is too low, thereby causing unwanted damage and / or reduced yield of the crops, the initial herbicidal activity is not acceptable or not strong enough, and / or the herbicidal activity does not last long enough. For these reasons, there is a constant need to develop herbicidal combinations which overcome the aforementioned disadvantages. There also exists a need for an environmentally safe herbicidal combination that can selectively control unwanted plants / weeds, while leaving other plants and crops unharmed. OBJECTIVES OF THE DISCLOSURE:

[0012] It is a primary objective of the present disclosure to provide a herbicidal combination for controlling or preventing unwanted plants / weeds in crops.

[0013] It is another objective of the present disclosure to provide a herbicidal combination for efficient weed control, weed suppression and weed eradication.

[0014] It is another objective of the present disclosure to provide a herbicidal combination possessing enhanced efficacy over the individual herbicides.

[0015] It is yet another objective of the present disclosure to provide a herbicidal combination comprising highly effective herbicidal actives for selective and non-selective weed control.

[0016] It is another objective of the present disclosure to provide a herbicidal combination comprising highly effective herbicidal actives for an efficient bum-down program.

[0017] It is yet another objective of the present disclosure to provide a herbicidal combination to control, suppress or prevent a wide spectrum of weeds comprising both dicotyledonous and monocotyledonous, broad-leaved, and grassy weeds.

[0018] It is yet another objective of the present disclosure to provide a herbicidal combination which is safe to use, effective and can be applied pre-emergence, postemergence or at the time of sowing.

[0019] It is another objective of the present disclosure to provide a herbicidal combination achieving increased yield in the crops to which they are applied, by reducing the number of weeds in the crops. Additionally, it is an objective of the present disclosure to provide a method of controlling resistant varieties of weeds with a herbicidal combination or a composition comprising such a combination.

[0020] SUMMARY OF THE DISCLOSURE:

[0021] In one aspect, the present disclosure provides a herbicidal combination comprising a carbamate herbicide and a chlorotriazine herbicide.

[0022] In another aspect, the present disclosure provides a herbicidal composition comprising a carbamate herbicide and a chlorotriazine herbicide.

[0023] Another aspect of the present disclosure provides a herbicidal composition comprising a carbamate herbicide, a chlorotriazine herbicide, and at least one agrochemically acceptable excipient.

[0024] An aspect of the present disclosure also provides a process of preparing a herbicidal combination / compo sition comprising a carbamate herbicide and a chlorotriazine herbicide.

[0025] Another aspect provides use of a herbicidal combination / compo sition comprising a carbamate herbicide and a chlorotriazine herbicide for effective control of weeds.

[0026] Yet another aspect of the present disclosure provides a method of controlling weeds comprising applying to a plant or a locus thereof, a herbicidal combination / composition comprising a carbamate herbicide and a chlorotriazine herbicide.

[0027] An aspect of the present disclosure also provides a kit-of-parts comprising a component of carbamate herbicide and another component of chlorotriazine herbicide. The said components may be mixed at the time of application as per the given set of instructions. Additional features and advantages of the present disclosure will be apparent from the detailed description that follows, which illustrates by way of example, the most preferred features of the present disclosure which are not to be construed as limiting the scope of the disclosure described herein.

[0028] DETAILED DESCRIPTION OF THE DISCLOSURE:

[0029] The present disclosure now will be described hereinafter with reference to the accompanying examples, in which embodiments of the disclosure are shown. This description is not intended to be a detailed catalogue of all the different ways in which the disclosure may be implemented, or all the features that may be added to the instant disclosure. Thus, the disclosure contemplates that in some embodiments of the disclosure, any feature or combination of features set forth herein can be excluded or omitted. In addition, numerous variations and additions to the various embodiments suggested herein will be apparent to those skilled in the art in light of the instant disclosure, which do not depart from the instant disclosure. Hence, the following descriptions are intended to illustrate some particular embodiments of the disclosure, and not to exhaustively specify all permutations, combinations and variations thereof.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the disclosure, suitable methods and materials are described herein.

[0031] “About” or “approximately” as used herein is inclusive of the stated value and means within an acceptable range of deviation for the particular value as determined by one of ordinary skill in the art, considering the measurement in question and the error associated with measurement of the particular quantity (i.e., the limitations of the measurement system). For example, “about” can mean within one or more standard deviations, or within ±10 or ±5 of the stated value.

[0032] The use of the terms “a”, “an”, and “the” and similar referents (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The terms first, second etc., as used herein are not meant to denote any particular ordering, but simply for convenience to denote a plurality of, for example, layers.

[0033] The terms “comprising”, “having”, “including”, and “containing” are to be construed as open-ended terms (i.e., meaning “including, but not limited to”) unless otherwise noted. The use of any and all examples, or exemplary language (e.g., “such as”), is intended merely to better illustrate the disclosure and does not pose a limitation on the scope of the disclosure unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the disclosure as used herein.

[0034] While the disclosure has been described with reference to an exemplary embodiment, it will be understood by those skilled in the art that various changes may be made, and equivalents may be substituted for elements thereof without departing from the scope of the disclosure. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the disclosure without departing from the essential scope thereof. Therefore, it is intended that the disclosure is not limited to the particular embodiment disclosed as the best mode contemplated for carrying out this disclosure, but that the disclosure will include all embodiments falling within the scope of the appended claims.

[0035] The term “control” relates to a weed, includes control of the weed, as well as protecting a plant, a portion of the plant, or a plant seed from attack or invasion by said weed. As used herein, the term “agrochemical” refers to all active substances which can be used in the agrochemical field, i.e., fungicides, bactericides, insecticides, acaricides, nematicides, molluscicides, rodenticides, repellents, plant growth regulators, herbicides and safeners, and plant nutrients.

[0036] Subsequently, the term “herbicide” encompasses both herbicides as well as plant growth regulators, as far as this does not otherwise emerge from the context. The term herbicide as used herein denotes a compound which controls or modifies the growth of undesired weeds / plants.

[0037] The term “herbicidally effective amount” indicates the quantity of such a compound or combination of such compounds which is capable of controlling or modifying effect on the growth of harmful plants / undesired vegetation / weeds. Controlling effects include all deviation from natural development, for example: killing, retardation, leaf bum, albinism, dwarfism, etc.

[0038] As used herein the term “plant” or “crop” refers to whole plants, plant organs (e.g., leaves, stems, twigs, roots, trunks, limbs, shoots, fruits etc.), plant cells, and plant seeds. This term also encompasses plant crops such as fruits. The term “plant” may further include the propagation material thereof, which may include all the generative parts of the plant such as seeds and vegetative plant material such as cuttings and tubers, which can be used for the multiplication of the plant. This includes seeds, tubers, spores, corms, bulbs, rhizomes, sprouts basal shoots, stolon, and buds and other parts of plants, including seedlings and young plants, which are to be transplanted after germination or after emergence from soil.

[0039] As used herein, the term “plant propagation material” is understood to denote generative parts of a plant, such as seeds, vegetative material such as cuttings or tubers, roots, fruits, tubers, bulbs, rhizomes and parts of plants, germinated plants and young plants which are to be transplanted after germination or after emergence from the soil. These young plants may be protected before transplantation by a total or partial treatment by immersion.

[0040] As used herein, the term “seed” embraces seeds and plant propagules of all kinds including but not limited to true seeds, seed pieces, suckers, corms, bulbs, fruit, tubers, grains, cuttings, cut shoots and the like. In a preferred embodiment a seed is a true seed.

[0041] As used herein, the term “pre-emergence” refers to the time point before seedlings emerge from the ground. When any herbicide is applied at pre-emergence stage, it prevents establishment of the germinated weed seedlings. As used herein, the term “post-emergence” refers to the time point after seedlings emerge from the ground. When any herbicide is applied at post-emergence stage, it prevents growth of the germinated weed seedlings.

[0042] As used herein, the term “increased yield” of an agricultural plant means that the yield of a product of the respective plant is increased by a measurable amount over the yield of the same product of the plant produced under the same conditions, but without the application of the compositions described herein. According to the present disclosure, it is preferred that the crop yield be increased by at least 0.5%, preferably at least 2%, more preferably at least 5%, upon application of the combinations and compositions described herein.

[0043] The term “weed” as used herein refers to the plant whose growth is considered undesirable in a particular situation i.e., growth of a plant at a wrong place and includes pesticide resistant plants. In the broadest sense, the term “weed” refers to plants which grow in locations in which they are not desired. In other words, a “weed” is a plant in which in the context of a crop is undesirable due to competition for water, nutrients, sunlight, soil, etc. The term may also refer to crop plants which are undesirable at a location. As used herein, the terms “undesirable vegetation”, “harmful plants”, “unwanted plants”, “weeds” and “weed species”, as used herein, are synonyms.

[0044] Typically, the combinations / compositions of the present disclosure are applied to the targeted weed or to their locus or to the crop / plant. The term “locus” as used herein shall denote the vicinity of a desired crop in which weed control, typically selective weed control is desired. The locus includes the vicinity of desired crop plants wherein the weed infestation has either emerged or is yet to emerge. The term crop shall include a multitude of desired crop plants or an individual crop plant growing at a locus. The said locus could be a weed, an area adjacent to the weed, soil adapted to support growth of the weed, a root of the weed and / or foliage of the weed.

[0045] As used herein, the term “phytotoxicity” refers to any adverse effect or reaction on plant growth, physiology, or metabolism caused by any chemical substance, fertilizer, herbicide, heavy metal, etc.

[0046] According to an embodiment, the present disclosure provides a herbicidal combination for controlling weeds. In another embodiment, the present disclosure provides a herbicidal combination for controlling herbicide -resistant weeds and / or herbicide-tolerant weeds.

[0047] In another embodiment, the present disclosure provides a herbicidal combination comprising:

[0048] at least one carbamate herbicide; and

[0049] at least one chlorotriazine herbicide.

[0050] In another embodiment, the mode of action of the carbamate herbicide is by inhibition of dihydropteroate synthase. In another embodiment, the mode of action of the chlorotriazine herbicide is by inhibition of photosynthesis, particularly photosystem II inhibition. In another embodiment, the present disclosure provides a herbicidal composition comprising:

[0051] a carbamate herbicide; and

[0052] a chlorotriazine herbicide.

[0053] In another embodiment, the carbamate herbicide is selected from the group comprising asulam, barban, 1 -methylpropyl (3-chlorophenyl)carbamate (BCPC), carbasulam, carbetamide, carboxazole, 2-chloroethyl-N-3 -chlorophenylcarbamate (CEPC), chlorbufam, 2-chloro- 1-methylethyl (3-chlorophenyl)carbamate (CPPC), dichlormate, famoxacarb, fenasulam, propham, swep, terbucarb, or combinations thereof.

[0054] In a preferred embodiment, the carbamate herbicide is asulam.

[0055] In another embodiment, the present disclosure provides a herbicidal combination comprising:

[0056] asulam; and

[0057] at least one chlorotriazine herbicide.

[0058] In another embodiment, the chlorotriazine herbicide is selected from the group comprising atrazine, chlorazine, cyanazine, cyprazine, eglinazine, ipazine, mesoprazine, procyazine, proglinazine, propazine, sebuthylazine, simazine, terbuthylazine, trietazine, or combinations thereof.

[0059] In a preferred embodiment, the chlorotriazine herbicide is terbuthylazine.

[0060] In another embodiment, the present disclosure provides a herbicidal combination comprising:

[0061] a carbamate herbicide comprising asulam; and

[0062] a chlorotriazine herbicide comprising terbuthylazine. In a preferred embodiment, the present disclosure provides a herbicidal combination comprising asulam and terbuthylazine.

[0063] In an embodiment, the herbicidal combination of the present disclosure may comprise an additional herbicide. In an embodiment, the herbicidal combination of the present disclosure optionally comprises an additional herbicide.

[0064] According to an embodiment, the present disclosure provides a herbicidal combination comprising a carbamate herbicide and a chlorotriazine herbicide, wherein the carbamate herbicide and the chlorotriazine herbicide are present in a weight ratio from about 1:100 to about 100:1, preferably from about 1:90 to about 90: 1, preferably from about 1:80 to about 80: 1, preferably from about 1:70 to about 70: 1, preferably from about 1:60 to about 60: 1, preferably from about 1:50 to about 50: 1, preferably from about 1:40 to about 40: 1, preferably from about 1:30 to about 30: 1, preferably from about 1:20 to about 20: 1, preferably from about 1: 10 to about 10: 1, preferably from about 1:5 to about 5: 1, preferably from about 1:3 to about 3:1, and more preferably from about 1:2 to about 2:1.

[0065] Unless otherwise indicated, the ratios disclosed throughout the specification are weight ratios.

[0066] In another embodiment, the present disclosure provides a herbicidal composition comprising:

[0067] a carbamate herbicide;

[0068] a chloro triazine herbicide; and

[0069] at least one agrochemically acceptable excipient.

[0070] In another embodiment, the present disclosure provides a herbicidal composition comprising:

[0071] asulam;

[0072] terbuthylazine; and

[0073] at least one agrochemically acceptable excipient. According to an embodiment of the present disclosure, the agrochemically acceptable excipients are selected from the group comprising emulsifier(s), colorant(s), thickener(s) / binder(s), antifreeze agent(s), antifoaming agent(s), antioxidant(s), solvent(s), preservative(s), glidant(s), anticaking agent(s), pH-regulating agent(s), buffering agent(s), formulation aid(s), disintegrant(s), or combinations thereof.

[0074] In another embodiment, in the herbicidal composition the carbamate herbicide is present from about 10% w / w to about 90% w / w, preferably from about 10% w / w to about 70% w / w, preferably from about 10% w / w to about 60% w / w, and more preferably from about 10% w / w to about 50% w / w of total weight of the composition.

[0075] In another embodiment, in the herbicidal composition the chlorotriazine herbicide is present from about 10% w / w to about 90% w / w, preferably from about 10% w / w to about 70% w / w, preferably from about 10% w / w to about 60% w / w, and more preferably from about 10% w / w to about 50% w / w of total weight of the composition.

[0076] In another embodiment, in the herbicidal composition the agrochemically acceptable excipient is present from about 10% w / w to about 90% w / w of total weight of the composition.

[0077] In another embodiment, the present disclosure provides use of the herbicidal combination for controlling weeds, the combination comprising:

[0078] a carbamate herbicide; and

[0079] a chlorotriazine herbicide.

[0080] In another embodiment, the present disclosure provides use of the herbicidal combination for controlling weeds, the combination comprising:

[0081] asulam; and terbuthylazine.

[0082] In another embodiment, the present disclosure provides use of the herbicidal combination for controlling weeds. In an embodiment, the present disclosure provides use of a herbicidal combination, for controlling herbicide-resistant and / or herbicide-tolerant weeds. In an embodiment, the present disclosure provides use of a herbicidal combination, for improving yield of the desired crop.

[0083] In another embodiment, the present disclosure provides a method for controlling weeds, wherein the method comprises applying to a plant or a locus thereof an effective amount of a herbicidal combination comprising:

[0084] a carbamate herbicide; and

[0085] a chlorotriazine herbicide.

[0086] In another embodiment, the present disclosure provides a method for controlling weeds, wherein the method comprises applying to a plant or a locus thereof an effective amount of a herbicidal combination comprising:

[0087] asulam; and

[0088] terbuthylazine.

[0089] In another embodiment, the present disclosure provides a method for controlling weeds by application of the herbicidal combination. In another embodiment, the present disclosure provides a method for controlling herbicide -resistant and / or herbicide-tolerant weeds by application of the herbicidal combination.

[0090] In another embodiment, the present disclosure provides a method for controlling weeds by application of an effective amount of the herbicidal combination to a plant, or a plant propagation material, or a locus thereof. The selection of the effective amount depends on the density of weed infestation, weather patterns, crop health, etc. In an embodiment, the present disclosure provides a method for controlling weeds, wherein the weeds are treated by applying concurrently or subsequently or sequentially the herbicidal combination. In an embodiment, the concurrent treatment refers to either tank-mix application or application of a premix formulation.

[0091] According to an embodiment, the herbicidal combination / composition is present either in a form of a tank mix or a pre-formulated (pre-mix) composition.

[0092] In another embodiment, the herbicidal combination comprises a carbamate herbicide applied at an application rate from about 1 g a.i. / ha to about 2000 g a.i. / ha, preferably from about 100 g a.i. / ha to about 2000 g a.i. / ha, preferably from about 500 g a.i. / ha to about 2000 g a.i. / ha, preferably from about 750 g a.i. / ha to about 2000 g a.i. / ha, preferably from about 1000 g a.i. / ha to about 2000 g a.i. / ha, and more preferably from about 1100 g a.i. / ha to about 1900 g a.i. / ha.

[0093] In a preferred embodiment, the herbicidal combination comprises asulam applied at an application rate of about 1880 g a.i. / ha. In a preferred embodiment, the herbicidal combination comprises asulam applied at an application rate of about 1500 g a.i. / ha. In a preferred embodiment, the herbicidal combination comprises asulam applied at an application rate of about 1400 g a.i. / ha. In a preferred embodiment, the herbicidal combination comprises asulam applied at an application rate of about 1200 g a.i. / ha.

[0094] In another embodiment, the herbicidal combination comprises a chlorotriazine herbicide applied at an application rate from about 1 g a.i. / ha to about 2000 g a.i. / ha, preferably from about 1 g a.i. / ha to about 1500 g a.i. / ha, preferably from about 10 g a.i. / ha to about 1000 g a.i. / ha, preferably from about 10 g a.i. / ha to about 900 g a.i. / ha, preferably from about 10 g a.i. / ha to about 800 g a.i. / ha, and preferably from about 10 g a.i. / ha to about 700 g a.i. / ha.

[0095] In another embodiment, the combination of the present disclosure is used to control weeds in various agricultural crops. Non-limiting examples of weeds controlled by the combination of the present disclosure include Spermacoce densiflora, Raphanus raphanistrum, Raphanus sativus, Sinapis arvensis, Capsella bursa-pastoris, Brassica juncea, Brassica campestris, Descurainia pinnata, Rorippa islandica, Rorippa sylvestris, Thlaspi arvense, Myagrum rugosum, Lepidium virginicum, Coronopus didymus, Dinebra retroflexa, Cynodon dactylon, Echinochloa colonum, Echinochloa crusgalli, Setaria viridis, Setaria faberi, Setaria glauca, Setaria ilosa ate, Digitaria ciliaris, Digitaria sanguinalis, Digitaria horizontalis, Digitaria insularis, Eleusine indica, Poa annua, Alospecurus aequalis, Alopecurus myosuroides, Avena fatua, Sorghum halepense, Sorghum vulgare, Agropyron repens, Eolium multiflorum, Eolium perenne, Eolium rigidum, Bromus secalinus, Bromus tectorum, Elordeum jubatum, Aegilops cylindrica, Phalaris arundinacea, Phalaris minor, Apera spicaventi, Panicum dichotomiflorum, Panicum texanum, Panicum maximum, Brachiaria reptains Brachiaria platyphylla, Brachiaria ruz.iziensis, Brachiaria plantaginea, Brachiaria decumbens, Brachiaria brizantha, Brachiaria humidicola, Brachiaria mutica, Cenchrus echinatus, Cenchrus pauciflorus, Eriochloa villosa, Pennisetum setosum, Chloris gayana, Chloris barbata, Eragrostis ilosa, Rhynchelitrum repens, Dactyloctenium aegyptium, Ischaemum rugosum, Oryza sativa, Paspalum notatum, Paspalum maritimum, Pennisetum clandestinum, Pennisetum setosum, Rottboellia cochinchinensis, Conzya species, Avena Sativa, Glycine max, Phaseolus vulgaris, or combinations thereof.

[0096] In another embodiment, the combination of the present disclosure is used to control weeds in various agricultural crops.

[0097] According to an embodiment, the present disclosure provides a method for controlling weeds in crops comprising rice, wheat, barley, rye, oat, sorghum, cotton, soybean, peanut, buckwheat, beet, rapeseed, sunflower, durum wheat, fall wheat, field corn, winter barley, cotton, fall barley, fallow, spring wheat, triticale, winter wheat, sugar cane, tobacco, etc.; vegetables; solanaceous vegetables such as eggplant, tomato, pimento, popper, potato, etc., cucurbit vegetables such as cucumber, pumpkin, zucchini, water melon, melon, squash, etc., cruciferous vegetables such as radish, white turnip, horseradish, kohlrabi, Chinese cabbage, cabbage, leaf mustard, broccoli, cauliflower, etc., asteraceous vegetables such as burdock, crown daisy, artichoke, lettuce, etc., liliaceous vegetables such as green onion, onion, garlic, and asparagus, ammiaceous vegetables such as carrot, parsley, celery, parsnip, etc., chenopodiaceous vegetables such as spinach, Swiss chard, etc., lamiaceous vegetables such as Perilla frutescens, mint, basil, etc. strawberry, sweet potato, Dioscorea japonica, colocasia, etc., flowers, foliage plants, turf grasses, fruits: pome fruits such apple, pear, quince, etc. stone fleshy fruits such as peach, plum, nectarine, Prunus mume, cherry fruit, apricot, prune, etc., citrus fruits such as orange, lemon, rime, grapefruit, etc., nuts such as chestnuts, walnuts, hazelnuts, almond, pistachio, cashew nuts, macadamia nuts, etc. berries such as blueberry, cranberry, blackberry, raspberry, etc., grape, kaki fruit, olive, plum, banana, coffee, date palm, coconuts, etc., trees otter than fruit trees; tea, mulberry, flowering plant, trees such as ash, birch, dogwood, Eucalyptus, Ginkgo biloba, lilac, maple, Quercus, poplar, Judas tree, liquidambar formosana, plane tree, zelkova. Japanese arborvitae, fir wood, hemlock, juniper, Pinus, Picea, and Taxus cuspidate, or combinations thereof.

[0098] According to an embodiment of the present disclosure, the herbicidal combination is usually applied to the unwanted plants / weeds by spraying on the leaves. Here, the application can be carried out using, for example, water as carrier by customary spraying techniques. In an embodiment, the application of the herbicidal combination may be done before, during and / or after, preferably before and / or after, the sowing of the crops. In an embodiment, the application of the herbicidal combination may be done on fallow field. In a preferred embodiment, the application of the herbicidal combination may be done to control the growth of weeds at the pre-emergence stage or the post-emergence stage. In a preferred embodiment, the application of the herbicidal combination may be done to control the growth of weeds close to the sowing stage of the crop. According to an embodiment of the present disclosure, the herbicidal combination may be applied pre-or post-emergence of weeds, or together with the plant, or plant propagation material, or locus of a plant thereof. It is also possible to apply the herbicidal combination to a plant, or a plant propagation material, or a locus thereof or pre-treating a crop plant with the herbicidal combination.

[0099] In another embodiment, the herbicidal combination of the present disclosure may be applied in combination with agrochemical components such as fertilizers, macronutrients, micronutrients, biologic als, bio stimulants, plant extracts, synergists, or combinations thereof. In an embodiment, the macronutrients or a micronutrient is selected from the group comprising nitrogen, phosphorus, potassium, calcium, sulfur, magnesium, iron, zinc, copper, boron, manganese, chlorine, molybdenum, nickel, or combinations thereof.

[0100] In another embodiment, the additional herbicide may be admixed with an adjuvant or a bio-stimulant or a fertilizer compound such that said components may be tank mixed before spraying.

[0101] According to an embodiment, the herbicidal combination is applied from a predosage device, a knapsack sprayer, a spray tank, a spray plane, or an irrigation system, or a drone, or an spot spray system. Typically, the herbicidal combination is made up with water, buffer, and / or further auxiliaries to the desired application concentration and the ready-to-use spray liquor of the herbicidal combination is thus obtained.

[0102] In another embodiment, the herbicidal combination may be used for foliar application, application to a ground, or to the soil, or to a plant, or a locus or a plant propagation material, or combinations thereof. In another embodiment, the herbicidal combination can be used in agricultural lands such as fields, paddy fields, lawns and orchards or in non-agricultural lands, fallow fields, or for the purpose of chemical fallow application.

[0103] According to an embodiment, the present disclosure provides a process for preparing a herbicidal combination / compo sition comprising:

[0104] a carbamate herbicide;

[0105] a chloro triazine herbicide; and

[0106] at least one agrochemically acceptable excipient thereof;

[0107] wherein the process comprises mixing the carbamate herbicide, the chlorotriazine herbicide and at least one agrochemically acceptable excipient homogenously to form the herbicidal combination / composition.

[0108] According to an embodiment, the various components of the herbicidal combination may be used individually or already partially or completely mixed with one or more to prepare the herbicidal combination. It is also possible for the components to be separately packaged and used as a component in a kit of parts. In one embodiment, the kits or kit of parts may include one or more of the components that are used to prepare the herbicidal combination. For examples, the kits may include active ingredients and / or at least one agrochemically acceptable excipient. One or more of the components may already be combined together or preformulated.

[0109] One or more of the components may already be combined together or preformulated. In those embodiments where more than two components are provided in a kit, the components may already be combined and as such are packaged in a single container such as a vial, bottle, can, pouch, bag and / or canister. In other embodiments, two or more components of a kit may be packaged separate from one another, i.e., they are not pre-formulated. As such, a kit may include one or more separate containers such as vials, cans, bottles, pouches, bags and / or canisters, each container containing a separate component of the herbicidal combination. According to an embodiment, the kit of parts comprises:

[0110] at least one carbamate herbicide;

[0111] at least one chlorotriazine herbicide;

[0112] and optionally further comprises:

[0113] instructions for use.

[0114] In an embodiment, the herbicidal combination comprising a carbamate herbicide and a chlorotriazine herbicide may provide synergistic control for weeds at pre-emergent and / or at post-emergent stage. In another embodiment, the herbicidal combination is synergistic and effective in improving yield of desired crop by controlling weeds. The herbicidal combination also provides increase in crop yield and crop quality.

[0115] In view of the above, it will be seen that several advantages of the disclosure are achieved, and other advantageous results attained. Although the present disclosure has been disclosed in full, it will be understood that numerous additional modifications and variations could be made thereto without departing from the scope of the disclosure.

[0116] The disclosure may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore, to be considered in all respects as illustrative and not restrictive.

[0117] Examples

[0118] Example 1:

[0119] Asulam 400 SL and terbutylazine 500 SC were tank mixed and efficacy against Spermacoce densiflora, Eleusine indica and Digitaria insularis was observed. The trial was conducted in greenhouse conditions, in a plot of 20 x 45 cm.

[0120] Foliar application was done on potted weeds post-emergence at following BBCH stage:

[0121] Eleusine indica - BBCH 27 - Seven tillers Digitaria insularis - BBCH 24 - Four tillers

[0122] Spermacoce densiflora - BBCH 16 - Six pairs leaves

[0123] % Weed control was determined at 21, 28 and 35 DAA (days after first application) for Spermacoce densiflora and Digitaria insularis', while % weed control was determined at 28 and 35 DAA (days after first application) for Eleusine indica. The expected efficacy was evaluated by Colby’s method

[0124] The expected efficacy of a combination of asulam and tembotrione was calculated using the well-established Colby method. Any difference between the observed and “expected” efficacy could be attributed to synergy between the two compounds. In the Colby method, the expected (or predicted) response of a combination of herbicides is calculated by taking the product of the observed response for each individual component of the combination when applied alone, divided by 100, and subtracting this value from the sum of the observed response for each component when applied alone. An unexpected enhancement in efficacy of the combination is then determined by comparing the observed response of the combination to the expected (or predicted) response as calculated from the observed response of each individual component alone. If the observed response of the combination is greater than the expected (or predicted) response, or stated conversely, if the difference between the observed and expected response is greater than zero, then the combination is said to be synergistic or unexpectedly effective (Colby, S. R., Weeds, 1967(15), p. 20-22). The Colby method requires only a single dose of each herbicide applied alone and the mixture of both doses. The formula used to calculate the expected efficacy (EE) which was compared with the observed efficacy (OE) to determine the efficacy of the present invention is explained hereinbelow:

[0125] The expected efficacy for a combination of two active ingredients is as follows:

[0126] EE = (A + B - (A x B) / 100) The expected efficacy for a combination of three active ingredients is as follows:

[0127] EE = A + B + C - (AB + AC + BC) / 100 + ABC / 10,000

[0128] Where,

[0129] A = Observed efficacy of active ingredient A at the same concentration as used in the mixture.

[0130] B = Observed efficacy of the active ingredient B at the same concentration as used in the mixture.

[0131] C = Observed efficacy of the active ingredient C at the same concentration as used in the mixture.

[0132] In current example, the following formula was applied

[0133] EE = (A + B - (A x B) / 100)

[0134] Wherein, EE is expected efficacy of combination of asulam and terbutylazine A is observed efficacy of asulam alone

[0135] B is observed efficacy of terbutylazine alone

[0136] Table 1: % weed control of Spermacoce densiflora

[0137]

[0138] Table 2: % weed control of Digitaria insularis

[0139]

[0140] Table 3: % weed control of Eleusine indica

[0141]

[0142] From tables 1 - 3 it is observed that the combination of asulam and terbuthylazine demonstrated more-than-additive control of weeds as compared to the addition of individual control efficacy of asulam and terbuthylazine.

Claims

CLAIMS:

1. A herbicidal combination comprising:a carbamate herbicide; anda chloro triazine herbicide.

2. The combination as claimed in claim 1, wherein the carbamate herbicide is asulam.

3. The combination as claimed in claim 1, wherein the chlorotriazine herbicide herbicide is terbutylazine.

4. The combination as claimed in claim 1, wherein the combination comprises asulam and terbutylazine.

5. The combination as claimed in claim 1, wherein asulam and terbutylazine are present in a weight ratio from about 1: 100 to about 100: 1.

6. A herbicidal composition comprising:a carbamate herbicide;a chloro triazine herbicide; andat least one agrochemically acceptable excipient.

7. The composition as claimed in claim 6, wherein the carbamate herbicide is asulam and the chlorotriazine herbicide is terbutylazine.

8. Use of the herbicidal combination as claimed in claim 1 or the herbicidal composition as claimed in claim 6, for controlling weeds by concurrent or subsequent or sequential application.

9. A method for controlling weeds, wherein the method comprises applying to a plant or a locus thereof, an effective amount of a herbicidal combination comprising:a carbamate herbicide; anda chloro triazine herbicide.

10. The method as claimed in claim 9, wherein the carbamate herbicide is asulam and the chlorotriazine herbicide is terbutylazine.

11. The method as claimed in claim 9, wherein the carbamate herbicide is applied at a rate of about 1 g a.i. / ha to about 2000 g a.i. / ha.

12. The method as claimed in claim 9, wherein the chlorotriazine herbicide is applied at a rate of about 1 g a.i. / ha to about 2000 g a.i. / ha.

13. The method as claimed in claim 9, wherein the weeds controlled are Spermacoce densiflora, Eleusine indica and Digitaria insularis.

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