MXPA00009848A - Synergistic herbicidal agents based on leaf herbicides containing phosphorus, imidazolinones and hormone weed-killers - Google Patents

Abstract

Herbicidal agents containing a combination (A)+(B)+(C) of (A) leaf-effective herbicides from the group of glufosinates and the esters and salts thereof, glufosinate peptides, such as bialaphos, and the salts thereof, glyphosates and the salts thereof, e.g. also sulfosates, (B) imidazolinone herbicides and the salts thereof and (C) one or more active substances from the group of hormone weed-killers and the salts thereof. Said herbicidal agents have synergistic herbicidal effects.

Description

SYNERGIC HERBICIDAL COMPOSITIONS BASED ON HERBICIDES OF LEAVES CONTAINING PHOSPHORUS, IMIDAZOLINONES AND HERBICIDES THAT PROMOTE GROWTH DESCRIPTIVE MEMORY The invention is in the field of compositions for the protection of crops which can be harvested against undesirable vegetation and which contain a combination of more than two herbicides as herbicidally active compounds. More specifically, the invention relates to herbicidal compositions comprising, as an active compound, a broad-spectrum herbicide of the type of herbicides that act on the leaves, such as glufosinate, bialaphos, glyphosate and sulfosate, in combination with two other herbicides of other certain classes of substances The herbicides that act on the aforementioned leaves are absorbed through the green parts of the plants and are known as broad-spectrum herbicides or total herbicides; see "The Pesticide Manual", 11th edition, Britislji Crop Protection Council 1997, p. 120, 382 and 646. They are used predominantly by the post-emergence method, to control weeds of broad leaves and weeds in farm crops and on uncultivated land and, by means of specific application techniques, also for the treatment between rows in row crops, such as corn, cotton and the like. Another area of increasing importance is in the transgenic plantings of plants that are resistant to herbicides. The effectiveness of the herbicides depends, among other things, on the type of herbicide used, in its application rate, in the formulation, in the harmful plants to be controlled in each case, in the climatic conditions and in the soil; etc. Another criterion is the duration of the action or the rate of degradation of the herbicide. Changes in the susceptibility of harmful plants to an active compound that may take place in prolonged use or when it is geographically restricted should also be taken into account; the loss of effectiveness to the resistance of harmful plants can only be compensated to a certain extent by higher application rates of the herbicides. Due to the large number of possible influencing factors, there is virtually no individual active compound in which the desired properties are combined for various requirements, in particular with respect to harmful plant species and climatic zones. There is additionally the permanent object of achieving the effect with even lower herbicide application rates. A lower application rate not only reduces the amount of an active compound that is required for the application, but also usually reduces the amount of formulation auxiliary materials that are required. Both reduce the economic expense and improve the ecological compatibility of the herbicide treatment.

A method that is frequently used to improve the property profile of a herbicide consists in the combination of the active compound with one or more other active compounds that contribute to the desired additional properties. However, when two or more active compounds are applied in combination, phenomena of physical and biological incompatibility are not uncommon, for example lack of stability of a co-formulation, decomposition of an active compound or antagonism of the active compounds. In contrast, what are desired are combinations of active compounds having a favorable activity profile, high stability and as synergistically enhanced activity as possible allowing a reduction in the application rate, as compared to the individual application of the compounds assets that have to be combined. Surprisingly, it has now been discovered that the active compounds from the group of the herbicides acting on the aforementioned leaves act particularly favorably with a combination of herbicides from the group of the imidazolinones and the herbicides that promote growth. The invention accordingly provides harbicide compositions comprising an effective amount of a combination of: A) one or more herbicides that act on the leaves of the group of the compounds of the formulas (A1) and (A2) and their esters and salts , (A1) (A2) wherein Z is a radical of the formula -OH or a peptide radical of the formula -NHCH (CH3) CONHCH (CH3) COOH or -NHCH (CH3) CONHCH [CH2CH (CH3) 2] COOH, B) one or more active compounds from the group of the imidazolinone herbicides, preferably imazapyr, imazetapyr, imazametabenz, in particular Mazapyr and its salts, C) one or more active compounds from the group of the growth promoting herbicides, preferably 2,4-D and MCPA. It is already known from EP-A-0252237 (CA-A-1291344) of the combination of glufosinate and its salts with midazolinone herbicides, in which synergistic increases in activity have been observed. From EP-A-0502010 (US-A-5525578), it is known that the activity of the combinations of glufosinate and imidazolinones can be increased by the addition of certain surfactants, for example from the polyglycol ether-sulfate series of alcohols fatty. Synergistic combinations of glufosinate with growth promoting herbicides are known, such as 2,4-MCPA, 2,3,6-TBA, CMPP, dichlorprop, 2,4-DB, MCPB and dicamba by DE-A-2856260 (GB -A-2011416). From DE-A-4019362 it is known to combine glyphosate or its derivatives with certain active agents as activators, it being possible for the combination to comprise other known active compounds. The possible active combination ingredients mentioned are, among others, 2,4-D, 2,4-DB, MCPP or imidazolinones instead, such as mazaquin and imazapur. EP-A-0569944 discloses the combination of imidazolinone herbicides of the group consisting of imazaquin, imazetapyr and imazetametapyr with herbicides from the group consisting of dicamba, 2,4-D, bromoxynil, pyridate, cyclohexanediones and sulfonylureas, wherein they also observed synergistic increases in activity. In addition, reports are known of experiments in the field of the following combinations: glyphosate and 2,4-D or dicamba (see Weed Science, Vol. 37, No. 1, 1989, pp. 12-18), glyphosate and imazaquin ( see Weed Technology, Vol. 6, No. 1, 1992, pp. 45-51), glufosinate or glyphosate and imazaquin (see Weed technology, Vol. 8, No. 1, 1994, pp. 17-22) and glyphosate and imazapir (see Weed Technology, Vol. 11, No. 1, 1997, pp. 76-80) Was commercially available or recommended a mixture of imazametabenz and mecropop (see "The Pesticide Manual", 10th edition 1994, pp. 583 , section "Applications").

Surprisingly, the combinations of herbicides A + B + C according to the invention allow synergistic increases in activity that exceed, by a wide margin and unexpectedly, the increases in activity achieved by the combinations of two compounds A + B and A + C. Formula (A1) encompasses all stereoisomers and mixtures thereof, in particular the racemate and the respective enantiomer which is biologically active, for example L-glufosinate and its salts. Some examples of active compounds of the formula (A1) are the following: (A1.1) glufosinate in the strict sense, ie DL-2-amino-4- [hydroxy (methyl) phosphinyl] butanoic acid, (A1.2) ) glufosinate-monoammonium salt, (A1.3) L-glufosinate, L- or (2S) -2-amino-4- [hydroxy (methyl) phosphinyl] -butanoic acid, (A1.4) L-glufosinate-monoammonium salt , (A1.5) bialaphos (or bilanafos), ie (L-2-amino-4- [hydroxy (methyl) phosphinyl] -butanoyl-L-alanyl-L-alanine, in particular sodium salt. glufosinate usually in salt form, preferably the ammonium salt The glumaninate or glufosinate-ammonium racemate is usually applied in dosages between 200 and 1000 g of SA / ha (= g of ai / ha = gram of active substance per At these dosages, glufosinate is effective especially when it is absorbed through the green parts of the plant, since it is microbically degraded in the soil for a few days, it does not persist in the soil. and similarly also to the related active compound bialaphos-sodium; see "The Pesticide Manual" 11a. edition, British Crop protection Council 1997, p. 382 and pages. 120. In the combinations according to the invention, there is generally considerably less active compound (A1) required, for example an application rate in the range of 20 to 500, preferably 20 to 100, grams of glufosinate active substance. per hectare of SA / ha og of ai / ha). The corresponding amounts, preferably quantities converted into moles per hectare, are also valid for glufosinate-ammonium and bialaphos or bialaphos-sodium. Some examples of compound (A2) are: (A2.1) glyphosate, ie N- (phosphonomethyl) glycine, (A2.2.) Glyphosate-monoisopropylammonium salt, (A2.3) glyphosate-sodium salt, (A2 .4) monoammonium glyphosate salt, (A2.5) sulfosate, ie N- (phosphonomethyl) glycine-trimesium salt = N- (phosphonomethyl) glycine-trimethylsulfonium salt, (A2.6) glyphosate-monoethyl ester. Glyphosate is usually used in the form of a salt, preferably the monoisopropylammonium salt or the trimethyisulfoxonium salt (trimesio) (sulfosate). Based on glyphosate free acid, the individual dosage is in the range of 1 to 5 kg of SA / ha. In many aspects and areas of use, glyphosate is similar to glufosinate. In the combinations according to the invention, application rates are generally required in the range of 20 to 500, preferably 20 to 100, g of SA / ha of glyphosate. Some examples of compounds (B) are: (B1) imazapyr and its salts and esters, (B2) imazetapyr and its salts and esters, (B3) imazametabenz and its salts and esters, (B4) imazametabenz-methyl, (B5) imazamox and its salts and esters, (B6) mazaquin and its salts and esters, for example the ammonium salt, (B7) AC 263,222 (imazapic) and its salts and esters. The application rates of the individual herbicides are generally in the range of 0.25 to 2 kg SA / ha. In the combinations according to the invention, application rates are generally required in the range of 20 to 500, preferably 20 to 100, g of SA / ha of the imidazolinones, preferably of imazapyr. Some examples of compounds (C) are growth promoting herbicides such as: (C1) 2,4-D [= (2,4-dichlorophenoxy) acetic acid] and its salts and esters, (C2) MCPA [= acid ( 4-chloro-2-methylphenoxy) acetic acid] and its salts and esters, (C3) 2,3,6-TBA [= 2,3,6-trichlorobenzoic acid] and its salts and esters, (C4) CMPP (Mecoprop) (C4.1) [= (RS) -2- (4-chloro-2-methylphenoxy) propionic acid], Mecoprop-P (C4.2) [= (+) - (R) -2- (4-) acid chloro-2-methylphenoxy) propionic] and its salts and esters, (C5) Dichlorprop (C5.1) [= (RS) -2- (2,4-dichlorophenoxy) -propionic acid], Dichlorprop-P (C5.2 ) [= (+) - (R) -2- (2,4-dichlorophenoxy) -propionic acid] and its salts and esters, (C6) 2,4-DB [= 4- (2,4-dichlorophenoxy) acid) butanoic] and its salts and esters, (C7) MCPB [= 4- (4-chloro-2-methylphenoxy) butanoic acid] and its salts and esters, (C8) Dicamba [= 3,6-dichloro-2-methoxybenzoic acid ] and its salts and esters. All the active compounds mentioned above are likewise known; see "The Pesticide Manual", 11a. Edition, British Crop Protection Council 1997. In the combinations according to the invention, application rates are generally required in the range of 100 to 1000, preferably 100 to 80, g of SA / ha of the herbicides that promote growth, preferably 2,4-D and MCPA, in particular 2,4-D. The weight ratios of components A: B: C can be varied within wide ranges. The ratio is preferably in the range of 1: 0.5: 0.1 to 1: 2: 2, particularly in the range of 1: 0.6: 0.2 to 1: 1: 1; the aforementioned ratios are preferably applicable for combinations with herbicides of the formula (A1). The optimal relationships may depend on the respective area of application, the spectrum of weeds and the combination of active compounds that are used and can be determined in preliminary experiments. The compositions according to the invention can be used for the selective control of annual and perennial harmful plants in hacienda plantings such as oil palm, coconut palm, rubber from India, auranciáceas, pineapples, cotton, coffee, cocoa and the like , and also the production of fruits and viticulture. Likewise, the combinations according to the invention can be used in the production of arable crops using the no-till or no-till method. Another area of use is the control of harmful plants in transgenic crops or crops selected in a classical manner that are resistant to the active compounds (A) + (B) + (C). However, it is also possible to use the compositions according to the invention non-selectively in sidewalks, open spaces, industrial sites, etc., to keep these areas free of undesirable vegetation. The compositions according to the invention act against a broad spectrum of weeds. They are suitable, for example, for controlling annual and perennial weeds such as, for example, the species of Agropyron, Paspalum, Cynodon, Imperata, Pennisetum, Convolvulus, Circium; Rumex, Hedyotis, Asystasia, Clear, Clidemia, Ageratum, Ottochloa, Axonopus, Brachiara, Digitaria, Panicum, Echinochloa, and the like. They can preferably be used against tropical weeds in hacienda plantings for example against Hedyotis verticillata, Asystasia intrusa, Clearia tatifolia, Clidemia hirta, Ageratum conyzoides, Ottochloa nodosa, Axonopus compressus, Brachiara mutica, Digitaria horizontalis, Panicum maximum, Echinochloa colona. The herbicidal compositions according to the invention have long-lasting herbicidal action with rapid onset. The stability against rain of the active compounds in the combinations according to the invention is good. A particular advantage is the fact that the effective dosages of the compounds (A), (B) and (C) used in the combinations are so low that their action on the soil is considerably reduced. This makes its use possible in sensitive sowings for the first time and, additionally, the contamination of groundwater is virtually avoided. The combinations according to the invention of the active compounds allow the required application rates of the active compounds to be considerably reduced. The invention thus also provides a method for controlling undesirable vegetation which comprises applying one or more herbicides of the type (A) with one or more herbicides of the type (B) and one or more of the herbicides of the type (C) to harmful plants, parts of these plants or the area under cultivation.

When the herbicides of type (A) + (B) + (C) are applied together, superaditive (= synergistic) effects are observed. The activity of the combinations is more pronounced than the expected sum of the activities of the individual herbicides used or the sum of the activities of combinations of the herbicides, such as, for example, 1/2 (A) + (B) and 1 / 2 (A) + (C), or a combination of two herbicides (A) + (B), (A) + (C) or (B) + (C) and the activity of the respective individual herbicide (A), (C) (B) or (C). Synergistic effects allow the application rate to be reduced, a broader spectrum of broadleaf weeds and weed grasses to be controlled, faster onset of herbicidal action, longer action, better control of harmful plants with only one application or few applications, and extension of the period within which the product can be used. These properties are required in the practice of weed control to keep agricultural crops free of undesirable competing plants and thus ensure and / or increase the quality and quantity of crops. These novel combinations markedly surpass the prior art in view of the properties thus described. The combinations of active compounds according to the invention can exist either in the form of mixed formulations of the three components, if appropriate together with other customary formulation auxiliaries, mixed formulations which are then applied in the usual manner in the form of dilution with water, or otherwise can be prepared in the form of so-called tank mixtures by joint dilution with water of the components that are formulated separately or partially separately. Compounds (A), (B) and (C) or their combinations can be formulated in various ways, depending on the prevailing biological and / or chemical-physical parameters. Suitable general possibilities for the formulations are, for example: wettable powders (WP), emulsifiable concentrates (EC), aqueous solutions (SL), emulsions (EW), such as oil-in-water and water-in-oil emulsions, solutions or sprayable emulsions, solutions based on oil or water, suspensions-emulsions, powders (DP), seed wrapping products, granules for application in soil or for spreading or dispersible granules in water (WG), ULV formulations, microcapsules or waxes. The individual types of formulation are known in principle and are described, for example, in: Winnacker-Küchler, "Chemische Technologie" [Chemical Technology], Vol. 7, Editorial C. Hauser, Munich, 4th edition 1986; van Valkenburg, "Pesticides Formulations", Marcel Dekker N.Y., 1973; K. Martens, "Spray Drying Handbook", 3rd Ed. 1979, G. Goodwin Ltd. London. Also known are the auxiliary formulation materials that are required, such as inert materials, surfactants, solvents and other additives, and are described, for example, in: Watkins, "Handbook of Insecticide Dust Diluents and Carriers," 2a. Ed., Darland Books, Caldwell N.J .; H.v. Olphen, "Introduction to Clay Colloid Chemistry"; 2a. Ed., J.Wiley & Sons, N.Y .; Marsden, "Solvents Guide", 2a. Ed., Interscience, N.Y. 1950; McCutcheon's, "Detergents and Emulsifiers Annual", MC Publ. Corp., Ridgewood N.J .; Sisley and Wood, "Encyclopedia of Surface Active Agents", Chem. Publ. Co. Inc., N.Y. 1964; Schonfeldt, "Grenzfláchenaktive Áthylenoxidaddukte" [Ethylene oxide surfactant adducts], Wiss. Verlagsgesellschaft, Stuttgart 1997; Winnacker-Küchler, "Chemische Technologie" [Chemical Technology], Volume 7, Editorial C. Hauser, Munich, 4a. Ed. 1986. Based on these formulations, it is also possible to prepare combinations with other pesticidally active substances, such as other herbicides, fungicides or insecticides, and also reducers of phytotoxic effect, fertilizers and / or direct filtration regulator, for example in the form of quick mix or tank mix. Wettable powders are preparations which are uniformly dispersible in water and which, in addition to the active compound, comprise ionic or nonionic surfactants (wetting agents, dispersants), for example polyethoxylated alkylphenols, polyethoxylated fatty alcohols or fatty amines, alkan sulfonates or alkylbenzenesulfonates, sodium lignosulfonate, sodium 2,2-dinaphthylmethane-6,6'-disulfonate, sodium dibutylnaphthalenesulfonate or in its place sodium oleoylmethyltaurinate, in addition to a diluent or an inert substance. The emulsifiable concentrates are prepared by dissolving the active compound in an organic solvent, for example butanol, cyclohexanol, dimethylformamide, xylene or instead aromatics or higher boiling hydrocarbons, with the addition of one or more ionic or nonionic surfactants (emulsifiers). . Some examples of emulsifiers that can be used are: calcium alkylarylsulfonates, such as calcium dodecylbenzylsulfonate, or nonionic emulsifiers, such as polyglycol esters of fatty acids, or alkylaryl polyglycol ethers, polyglycol ethers of fatty alcohols, propylene / ethylene oxide, alkyl polyethers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty esters or polyoxyethylene sorbitol esters. Powders are obtained by grinding the active compound with finally divided solid materials, for example talc, natural clays, such as kaolin, bentonite and pyrophyllite, or diatomaceous earth. Granules can be prepared either by spraying the active compound onto the inert granular absorbent material or by applying it in concentrates of active compound to the surface of carriers, such as sand, kaolinite or inert granulated material, with the aid of binders, for example polyvinyl alcohol, sodium polyacrylate or instead general oils. The suitable active compounds can also be granulated in the usual manner for the preparation of fertilizer granules, if desired as a mixture with fertilizers. Water-dispersible granules are generally prepared by processes such as spray drying, fluidized bed granules, disk granulation, mixing using high speed mixers and extrusion without solid inert material.

The agrochemical preparations generally comprise from 0.1 to 99% by weight, in particular from 2 to 95% by weight, of the active compounds of types A and / or B, the following concentrations being usual, depending on the type of formulation. In wettable powders, the concentration of active compounds is, for example, approximately 10 to 95% by weight, with the remainder being 100% by weight of customary formulation components. In the case of emulsifiable concentrates, the concentration of active compounds can be, for example, from 5 to 80% by weight. The formulations in the form of powders comprise in most cases from 5 to 20% by weight of the active compound, solutions which are roughly from 0.2 to 25% by weight of active compound. In the case of granules, such as dispersible granules, the content of active compounds depends in part on whether the active compound is in liquid or solid form and on which granulation auxiliaries and fillers it is used. In general, the content of dispersible granules in water amounts between 10 and 90% by weight. In addition, the aforementioned active compound formulations comprise, if appropriate, tackifiers, wetting agents, dispersants, emulsifiers, preservatives, antifreeze agents, solvents, fillers, colorants, carriers, antifoams, evaporation inhibitors and pH or viscosity regulators. They are usual in each case. It is known, for example, that the activity of glufosinate-ammonium and its L-enantiomer can be improved with surfactants, preferably with wetting agents of the alkyl polyglycol ether sulfate series containing, for example, 10 to 18 carbon atoms. carbon and which are used in the form of their alkali metal or ammonium salts, or in their place as salt and magnesium, such as ethylglycol ether of C ?2 / C14 fatty alcohols (®Genapol LRO, Hoechst); see EP-A-0476555, EP-A-0048436, EP-A-0336151 or US-A-4,400,196 and Proc. EWRS Symp. "Factors Affecting Herbicidal Activity and Selectivity", 227-232 (1988). Furthermore, it happens that the alkyl polyglycol ether sulfates are also suitable for use as penetration promoting and activity enhancing auxiliary materials for many other herbicides, including, among others, herbicides of the imidazolinone series; see EP-A-0502014. For use, the formulations, which are commercially available, are diluted, if appropriate, in a customary manner, for example using water in the case of wettable powders, emulsifiable concentrates, dispersions and water dispersible granules. Preparations in the form of powders, soil granules, spreadable granules and sprayable solutions are no longer conventionally diluted with other inert substances before use. The active compounds can be applied to the plants, part of the plants, seeds of the plants and the area in cultivation (tilled soil), preferably to the green plants and part of the plants and, if desired, additionally to the tilled soil. 1 A possible use is a joint compound of the active compounds in the form of a tank mixture, in which the concentrated formulations of the individual active substances, in the form of their optimum formulations, are mixed together with water in the tank and the mixture of spray obtained. A joint herbicidal formulation of the combination according to the invention of the active compounds (A) and (B) and (C) has the advantage that it can be applied more easily, because the amounts of the components have already been adjusted once a another to correct the relationship. In addition, auxiliary materials of the formulation can be selected to suit one another in the best possible way, while a tank mixture of several formulations can result in undesirable combinations of auxiliary materials.

A. Examples of general formulations a) A powder is obtained by mixing 10 parts by weight of a mixture of active compound / active compound and 90 parts by weight of talc as an inert substance and grinding the mixture in a hammer mill. b) A wettable powder is obtained which is readily dispersible in water by mixing 25 parts by weight of a mixture of active compound / active compound, 64 parts by weight of quartz containing kaolin as an inert substance, 10 parts by weight of potassium lignosulfonate and 1 part by weight of sodium oleoylmethyltaurinate as a wetting and dispersing agent, and grinding the mixture in an interlocked disk mill. c) A dispersion concentrate is obtained which is readily dispersible in water, by mixing 20 parts by weight of a mixture of active compound / active compound with 6 parts by weight of alkyl phenol polyglycol ether (®Triton X 207), 3 parts by weight. weight of isotridecanol-polyglycol ether (8 EO) and 71 parts by weight of paraffinic mineral oil (boiling range for example about 255 to 277 ° C) and milling the mixture in a bead mill to a fineness of less than 5. mieras d) An emulsifiable concentrate is obtained from 15 parts by weight of a mixture of active compound / active compound, 75 parts by weight of cyclohexanone as a solvent and 10 parts by weight of ethoxylated nonylphenol as an emulsifier. e) Water-dispersible granules are obtained by mixing: 75 parts by weight of a mixture of active compound / active compound, 10 parts by weight of calcium lignosulfonate, 5 parts by weight of sodium lauryl sulfate, 3 parts by weight of the piliviil alcohol and 7 parts by weight of kaolin, grinding the mixture in an interlocked disk mill and granulating the powder in a fluidized bed, and sprinkling over water as a granulation liquid. f) Water-dispersible granules are also obtained by homogenising and pre-triturating, in a colloid mill, 25 parts by weight of a mixture of active compound / active compound, 5 parts by weight of 2I2'-dinaphthylmethane-6,6'-disulfonate. , 2 parts by weight of sodium oleoylmethyltaurinate, 1 part by weight of polyvinyl alcohol, 17 parts by weight of calcium carbonate and 50 parts by weight of a water, subsequently grinding the mixture in a globule mill and atomizing and drying the suspension resulting in a spray tower by means of a single substance nozzle.

BIOLOGICAL EXAMPLES EXAMPLE 1 (Field experiment) In an oil palm plantation, the economically important tropical weed Hedyotis verticillata was grown in plots of the dimensions of 2 x 5 meters under natural outdoor conditions and treated with the herbicides A1.2, B1 and C1, their mixtures of a mixture of tank under normal conditions using a plot sprinkler, at a water application rate of 450 liters of water per hectare (application on top of weeds, density in plants initially more than 95% of land extension). At intervals of 1, 2, 3, 4, 5, 6, 7 and 8 weeks after application, after application, the herbicidal efficacy of the active compounds or the mixture of visually active compounds was evaluated on the basis of the treated plots, compared to untreated control plots. Damage was recorded from all parts of the plants above the ground and their development. The evaluation was carried out using a percentage scale (100% effect = all the plants annihilated; 50% effect = 50% of the plants and the green parts of the annihilated plants; 0% effect = no perceptible effect = as control plots). The evaluation values of 4 plots were averaged in each case. The results are summarized in table 1. The comparison shows that mixtures of three components (experiments 1 and 2) have a herbicidal activity that is in most cases higher, in some cases considerably higher, than the amounts of the activities of the individual herbicides or the sum of the activities of the corresponding mixtures of two components or mixtures of two individual components and herbicides; compare, for example, experiment No. 1 with experiments No. 6 + 15, No. 7 + 14 or No. 5 + 10 or experiment No. 2 with experiments No. 8 + 14, No. 3 + 9 or No. 4 + 6, in each case in the same week after the application.

If the values of the observed activity already exceed the formal sum of the values for the experiments for two-component or individual applications, they also exceed the expected value according to Colby which is calculated using the following formula (see SR Colby, in Weeds 15 (1967) pp. 20 to 22): E = A + B + C- (ABC / 1000) or E = AB + C- (AB C / 100) or E = AB + AC- (AB AC / 100) figures denote: A, B, C, AB, AC = activity of the active compounds A, B, C, A + B and A + C, respectively, in% in a, b, c, a + b and a + c, respectively, g of SA / ha; E = expected value in% in a + b + c, g of SA / ha. According to all the criteria, the observed values of experiments 1 and 2 exceed the expected values according to Colby.

TABLE 1 Abbreviations in table 1 (see below): sem. after api = weeks after application A1.2 = glufosinate-ammonium (g of SA / ha is based on the amount of salt). B1 = imazipir (g of SA / ha is based on the amount of acid equivalent). C1 = 2,4-d-sidium salt (g of SA / ha is based on the amount of salt).

EXAMPLE 2 (Field experiment) In the rubber plantation, plots were cultivated with the intrusive Asystasia tropical weed and natural outdoor conditions (dimensions of the plots of 2 x 5 m). The herbicides or their mixtures were applied in a tank mixture and normal conditions (application on top using a cell spray, water application rate with 450 I / ha). At intervals of 4, 7, 13, 17 and 21 weeks after application, the herbicidal efficacy of the active compounds and their mixtures was evaluated visually on the basis of the treated plots, and compared to untreated control plots. Damage was recorded from all parts of the plants above the ground and their development. The evaluation described in example 1 was carried out. The results are summarized in table 2. The comparison of the evaluation values shows that the three-component mixture (experiment 1) has a long-term activity considerably better than the sum of herbicidal activities of individual herbicides (see experiments after 13 to 21 weeks after application).

TABLE 2 Herbicidal activity against invasive Asvstasia in a rubber plantation Abbreviations for Table 2: See abbreviations for the box 1 EXAMPLE 3 (Field experiment) In a rubber plantation, plots were cultivated with the Axonopus compressus tropical undergrowth in natural outdoor conditions (dimensions of the plots of 2 x 5 m). The herbicides and their mixtures in a tank mix under normal conditions using a plot sprinkler at a water application rate of 450 liters of water per hectare (top application). At intervals of 4, 7, 13, 17 and 21 weeks after the application, the efficacy was evaluated visually received from active compounds or mixtures of active compounds on the basis of the treated plots, compared to untreated control plots. Damage was recorded to all parts of the plants above the ground and their development. An evaluation was carried out as described in example 1. The results are summarized in table 3. The comparison of the evaluation values shows that the three-component mixture (experiment 1) has long-term activity considerably better than the sum of the herbicidal activities of individual herbicides (see experiments after 13 to 21 weeks after application). TABLE 3 Abbreviations for Table 3: See abbreviations for Table 1 EXAMPLE 4 (Field experiment) In a sugar cane plantation, plots were cultivated with the weeds Brachiaria mutica, Digitaria horizontalis, Panicum maximum, Echinochloa colona and Ageratum conyzoídes under natural outdoor conditions (dimensions of the plots of 2 x 5 m). The herbicides and their mixtures were applied in a tank mix under normal conditions (application on the top using a plot sprinkler, water application rate 450 l / ha). Four weeks after the application, the effectiveness of the active compounds or their mixtures was visually evaluated on the basis of the treated plots, in comparison with untreated control plots. Damage was recorded to all parts of the plants above the ground and their development. An evaluation was carried out as described in example 1. The results are summarized in table 4. The comparison of the evaluation values shows that the three-component mixture (experiment 1) has a significantly better average activity and a spectrum of activity wider than the activity of component A1.2 at a higher application rate.

TABLE 4 Herbicide activity against weeds in a cane plantation Abbreviations for Table 4: 1) Average herbicide activity in percent, four weeks after application; mean value for the five weeds Brachiria mutica, Digitaria horinzontalis, Panicum maximum, Echinochloa colona and Ageratum conyzoides. 2) Extension of weeds in percent of land extension; the control plot has more than 95% weed extension.

Claims (9)

NOVELTY OF THE INVENTION CLAIMS

1. - A herbicidal composition, comprising an effective amount of a combination of: A) one or more herbicides acting on the leaves of the group of the compounds of formulas (A1) and (A2) and their esters and salts, (A1) (A2) wherein Z is a radical of the formula -OH or a peptide radical of the formulas -NHCH (CH3) CONHCH (CH3) COOH or -NHCH (CH3) CONHCH [CH2CH (CH3) 2] COOH; B) one or more active compounds from the group of herbicides and imidazolinone and their salts; C) one or more active compounds of the group of herbicides that promote growth and their esters and salts.

2. The herbicidal composition according to claim 1, comprising, as herbicide (A), a group D herbicide, L-glufosinate, D, L-glufosinate-ammonium, L-glufosinate, L-glufosinate-ammonium, bialaphos and bialaphos-sodium, glyphosate, glyphosate-sodium, glyphosate-monoisopropylammonium, sulfosate and glyphosate-monoethyl ester and their mixtures.

3. The herbicidal composition according to claim 1 or 2, comprising, as herbicide (B), a herbicide of the group imazapyr, imazetapyr, imazametabenz, imazametabenz-methyl, imazamox, imazaquin, AC 263.222 and salts and esters of the herbicides mentioned above and mixtures of the aforementioned herbicides.

4. The herbicidal composition according to any of claims 1 to 3, comprising, as herbicide (C), a herbicide of the group 2,4-D, MCPA, 2,3,6-TBA, mecoprop, mecoprop P, dicloprop, dichlorprop-P, 2,4-DB, MCPB and dicamba and their salts, esters and mixtures of the aforementioned herbicides.

5. The herbicidal composition according to any of claims 1 to 4, comprising, as herbicides, a combination of (A) glufosinate-ammonium, (B) imizapir and (C) 2,4-D-sodium salt .

6. The herbicidal composition according to any of claims 1 to 5, further characterized in that the weight ratios A: B: C of the combined herbicides A, B and C are in the range of 1: 0.5: 0.5 to 1 : 2: 2

7. The herbicidal composition according to any of claims 1 to 6, comprising 1-99% by weight of herbicides and 99-1% by weight of agents to be formulated that are usual in plant protection.

8. A method for controlling undesirable vegetation, which comprises applying one or more herbicides (A) with one or more herbicides (B) and one or more herbicides (C) on harmful plants, plant parts thereof or the area under cultivation , where the combination of herbicides (A), (B) and (C) is as defined in any of claims 1 to 6. 9.- The use of a combination of herbicides (A), (B) and (C) as a herbicidal composition to control undesirable vegetation, wherein the combination of the herbicides (A), (B) and (C) is as defined in any of claims 1 to 6.