Procedure for applying a localized treatment against weeds

Abstract

The invention relates to the use of one or more compounds of formula (I) or salts thereof, (I) wherein groups R1 to R3, X2 to X6, Z and G are defined as set forth in claim 1, optionally in the presence of additional agrochemical active ingredients, for the application of localized weed treatment in an agricultural field where a plurality of crop plants are growing, have been sown, have been transplanted, are to be sown and / or are to be transplanted.

Description

Procedure for applying a localized treatment against weeds Field of invention The invention relates to the field of plant protection and environmental health, more specifically to the use of precision-applied agrochemicals to control unwanted vegetation. Background of the invention Weed control practices aim to eliminate weeds from an agricultural field to reduce competition for natural resources and minimize yield loss. The use of a non-selective herbicide in a field targeting crops that are not resistant to the herbicide cannot be achieved with traditional field sprayers, as these sprayers apply herbicides across the entire field. To overcome these limitations, hooded field sprayers can be used in conjunction with non-selective herbicides. However, even when applied as spot treatments, non-selective herbicides can severely damage crops due to absorption through the soil or volatility of the applied compounds near susceptible plants. Other agrochemicals have disadvantages in that they do not adequately control weeds or do not control some weeds at all (gaps). Therefore, there is a general need for novel and alternative procedures to protect cultivated plants in an agricultural field against weeds. Compounds of the substituted isoxazolincarboxamide structural class are known as herbicides useful for weed control against a wide range of weeds, as described in documents WO2018 / 228985 and WO2019 / 145245 in burning applications. Combinations of such herbicidal active ingredients with certain other herbicides for weed control are also known; see, for example, document WO2020 / 114932. It has now been found that some selected compounds from the aforementioned group of substituted isoxazolincarboxamides can surprisingly be used for spot treatments against weeds in agricultural fields with crops without substantially harming the crops. The application of spot treatments is surprising because many broad-spectrum herbicides are known to also damage crops due to their uptake through the soil, even if applied only in the immediate vicinity of the crops. The compounds of formula (Ia), however, are safe for the crop when applied in close proximity, as they appear not to leach into the crop root zone or become volatile, thus preventing the crop plants from absorbing the agrochemical. Detailed description of the invention An object of the invention is the use of one or more substituted isoxazolincarboxamides of formula (Ia) or agrochemically acceptable salts thereof, for spot treatment application against weeds in an agricultural field in which a plurality of crop plants grow, have been sown, have been transplanted, are to be sown and / or are to be transplanted. Definitions Halogen represents fluorine, chlorine, bromine, and iodine radicals. Fluorine and chlorine radicals are given preference. Alkyl refers to saturated hydrocarbon radicals of straight or branched chains that have the number of carbon atoms specified in each case, for example. C1-C6-alkyl as methyl, ethyl, propyl, 1-methylethyl, butyl, 1-methylpropyl, 2-methylpropyl, 1,1-dimethylethyl, pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 2,2-methylpropyl, 1-ethylpropyl, hexyl, 1,1-methylpropyl, 1,2-methylpropyl, 1-methylpentyl, 2-methylpentyl, 3-methylpentyl, 4-methylpentyl, 1,1-dimethylbutyl, 1,2-dimethylbutyl, 1,3-dimethylbutyl, 2,2-dimethylbutyl, 2,3-dimethylbutyl, 3,3-dimethylbutyl, 1-ethylbutyl, 2-ethylbutyl, 1,1,2-trimethylpropyl, 1, 2,2-trimethylpropyl, 1-ethyl-1-methylpropyl and 1-ethyl-2-methylpropyl. Alkenyl means unsaturated hydrocarbyl radicals of straight or branched chain that have the number of carbon atoms specified in each case and a double bond in any position, for example. C2-C6-alkenyl such as ethenyl, 1-propenyl, 2-propenyl, 1-methylethenyl, 1-butenyl, 2-butenyl, 3-butenyl, 1-methyl-1-propenyl, 2-methyl-1-propenyl, 1-methyl-2-propenyl, 2-methyl-2-propenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 4-pentenyl, 1-methyl-1-butenyl, 2-methyl-1-butenyl, 3-methyl-1-butenyl, 1-methyl-2-butenyl, 2-methyl-2-butenyl, 3-methyl-2-butenyl, 1-methyl-3-butenyl, 2-methyl-3-butenyl, 3-methyl-3-butenyl, 1, 1-methyl-2-propenyl, 1, 2-methyl-1-propenyl, 1, 2-methyl-2-propenyl, 1-ethyl-1-propenyl, 1-ethyl-2-propenyl, 1-hexenyl, 2-hexenyl, 3-hexenyl, 4-hexenyl, 5-hexenyl, 1-methyl-1-pentenyl, 2-methyl-1-pentenyl, 3-methyl-1-pentenyl, 4-methyl-1-pentenyl, 1-methyl-2-pentenyl, 2-methyl-2-pentenyl, 3-methyl-2-pentenyl, 4-methyl-2-pentenyl, 1-methyl-3-pentenyl,2-metil-3-pentenilo, 3-metil-3-pentenilo, 4-metil-3-pentenilo, 1-metil-4-pentenilo, 2-metil-4-pentenilo, 3-metil-4-pentenilo, 4-metil-4-pentenilo, 1, 1-dimetil-2-butenilo, 1, 1-dimetil-3-butenilo, 1, 2-dimetil-1-butenilo, 1, 2-dimetil-2-butenilo, 1, 2-dimetil-3-butenilo, 1, 3-dimetil-1-butenilo, 1, 3-dimetil-2-butenilo, 2, 2-dimetil-3-butenilo, , , Alkynyl represents a straight-chain or branched hydrocarbyl group having 2 to 8, preferably 2 to 6, carbon atoms and a triple bond in any position. Non-limiting examples include ethyl, prop-1-amyl, prop-2-amyl, but-1-amyl, but-2-amyl, but-3-amyl, 1-methylprop-2-amyl, pent-1-amyl, pent-2-amyl, pent-3-amyl, pent-4-amyl, 1-methylbut-2-amyl, 1-methylbut-3-quinyl, 2-methylbut-3-quinyl, 3-methylbut-1-quinyl, 1,1-dimethylprop-2-quinyl, 1-ethylprop-2-quinyl, hex-1-quinyl, hex-2-quinyl, hex-3-quinyl, hex-4-quinyl, hex-5-quinyl, 1-methylpent-2-quinyl, 1-methylpent-3-quinyl, 1-methylpent-4-quinyl, 2-methylpent-3-quinyl, 2-methylpent-4-quinyl, 3-methylpent-1-quinyl, 3-methylpent-4-quinyl, 4-methylpent-1-quinyl, 4-methylpent-2-quinyl, 1, 1-dimethylbut-2-quinyl, 1, 1-dimethylbut-3-acyl, 1, 2-dimethylbut-3-acyl, 2, 2-dimethylbut-3-acyl, 3,3-dimethylbut-1-acyl, 1-ethylbut-2-acyl, 1-ethylbut-3-acyl, 2-ethylbut-3-acyl and 1-ethyl-1-methylprop-2-acyl. Cycloalkyl means a saturated carbocyclic ring system preferably having 3 to 8 ring carbon atoms, for example cyclopropyl, cyclobutyl, cyclopentyl, or cyclohexyl. Optionally substituted cycloalkyls include cyclic systems with substituents, including substituents with a double bond in the cycloalkyl radical, for example an alkylidene group such as methylidene. Alkoxy means saturated straight-chain or branched alkoxy radicals having the number of carbon atoms specified in each case, for example C1-C6-alkoxy such as methoxy, ethoxy, propoxy, 1-methylethoxy, butoxy, 1-methylpropoxy, 2-methylpropoxy, 1,1-dimethylethoxy, pentoxy, 1-methylbutoxy, 2-methylbutoxy, 3-methylbutoxy, 2,2-dimethylpropoxy, 1-ethylpropoxy, hexoxy, 1,1-dimethylpropoxy, 1,2-dimethylpropoxy, 1-methylpentoxy, 2-methylpentoxy, 3-methylpentoxy, 4-methylpentoxy, 1,1-methylbutoxy, 1,2-methylbutoxy, 1,3-dimethylbutoxy, 2,2-dimethylbutoxy, 2,3-dimethylbutoxy, 3, 3-dimethylbutoxy, 1-ethylbutoxy, 2-ethylbutoxy, 1, 1, 2-trimethylpropoxy, 1, 2, 2-trimethylpropoxy, 1-ethyl-1-methylpropoxy and 1-ethyl-2-methylpropoxy.Halogen-substituted alkoxy shall be understood to mean straight-chain or branched alkoxy radicals having the number of carbon atoms specified in each case, in which some or all of the hydrogen atoms of these groups may be substituted by halogen atoms as specified above, for example C1-C2-haloalkoxy such as chloromethoxy, bromomethoxy, dichloromethoxy, trichloromethoxy, fluoromethoxy, difluoromethoxy, trifluoromethoxy, chlorofluoromethoxy, dichlorofluoromethoxy, chlorodifluoromethoxy, 1-chloroethoxy, 1-bromoethoxy, 1-fluoroethoxy, 2-fluoroethoxy, 2-difluoroethoxy, 2-trifluoroethoxy, 2-chloro-2-fluoroethoxy, 2-chloro-1, 2-difluoroethoxy, 2-dichloro-2- ...chloro-2-chloro-2-chloro-2-chloro-2-chloro-2-chloro-2-chloro-2-chloro-2-chloro-2-chloro-2-chloro-2-chloro-2-chloro-2-chloro-2-chloro-2-chloro-2-chloro-2-chloro-2- 2,2-trichloroethoxy, pentafluoroethoxy and 1,1,1-trifluoroprop-2-oxy. Hereinafter, the compounds of formula (Ia) or their salts to be used according to the invention are also referred to in short as "compounds (Ia) according to the invention" or simply "compounds (Ia)".The compounds (Ia) or salts thereof are generally known by WO2018 / 228985 and WO2019 / 145245 or can be prepared according to the procedures described therein. The compounds (Ia) or agrochemically acceptable salts thereof in which in which. X3, X5, R3 and G are as described above; Z means Z-1 or Z-4a, in which Z-4a means the mixture of both structures Z-4b and Z-4c; and in which the arrow signifies a link to the CO-G group of formula (Ia), for the application of a specific treatment against weeds in an agricultural field where a plurality of cultivated plants grow, have been sown, have been transplanted, are going to be sown and / or are going to be transplanted. The compounds (Ia) shown in Table 1 or acceptable agrochemical salts thereof for spot treatment application against weeds in an agricultural field in which a plurality of crop plants grow, have been sown, have been transplanted, are to be sown and / or are to be transplanted: Table 1: Compounds (Ia) The compounds of formula (Ia) and their salts, all hereinafter referred to as compounds of formula (Ia), exhibit herbicidal activity against a wide range of economically important monocotyledonous and dicotyledonous noxious plants. The compounds of formula (Ia) are also effective against perennial weeds that produce shoots from rhizomes, rootstocks, or other perennial organs and that are difficult to control. The herbicidal compounds (Ia) mentioned above demonstrate an excellent and desirable effect for spot treatment of weeds in an agricultural field where a plurality of crop plants are growing, have been sown, have been transplanted, are to be sown, and / or are to be transplanted. The term "spot treatment of weeds" refers to the opposite of a uniform surface treatment of a herbicide in an agricultural field (such as a blank or broadcast application). Thus, the term refers to a treatment selected for a locus where weeds are growing or a locus (soil) where weeds may grow and compete with the crop for resources.In addition, the term also includes a partial application of herbicide across an entire field for weed control, for example, application only to individual weed plants growing scattered throughout the field, larger weed patches ranging in size from less than 1 m² to more than 100 m² each, or uniform treatment of the space between rows of row crops (also called band treatment). Spot treatment can be applied to control only a specific weed species within the field, based on automatic weed species recognition or weed-crop species recognition in the application device, guided by a second device, or based on field maps that map the weed species infestation across the entire field, carried out before the control application.In addition, spot treatment can be applied non-selectively to all weeds growing at the applied point, in larger patches, or in the space between rows without differentiating between the different weed species. Spot weed control in an agricultural field preferably comprises a spot spray application. Spot spraying includes spray applications sometimes referred to as "direct foliar spray applications," which are herbicide applications to weeds between crop rows, directing the spray only onto the weeds and avoiding the crop. Spot spraying also includes spray applications sometimes referred to as "protected foliar spray applications," which are herbicide applications to weeds covered with widely spaced crops (such as polyethylene covers) or using a protective shield or hood that covers the nozzle and spray, physically protecting the crop from direct spraying or spray drift.It can also be applied using nozzles with a narrow spray angle that prevent fine droplets that cause drift from reaching the crop plants and limit spraying to the closest proximity of the target plant and around it. Spot spraying comprises spray applications sometimes referred to as "band spray applications" which refer to herbicide applications to the soil / weeds in a restricted band along the crop rows, leaving an untreated band in the intervening rows. Spot spraying can be performed by visually spraying the compound of the present invention using a handheld nozzle or a robotic arm nozzle while a human sprayer walks through the agricultural field. Alternatively, the sprayer travels on a vehicle such as a tractor with a hooded boom sprayer, for example, or uses a flying device such as an unmanned aerial vehicle (UAV) or a ground robot such as an unmanned ground vehicle (UGV) for spot spray application. Targeted application to weed infestations in a field can be performed with small, autonomous driving devices operating in the space between rows of row crops or by devices agitated by a second device that monitors in real time or with a time delay and creates a weed map of the entire field prior to treatment.Another option for controlling weed infestation in the field would be to use implements attached to a tractor's three-point hitch, or towed or autonomous implements that cover several rows of crops. The agitation of these devices can be based on RTK GPS / Galileo systems, supported by row guidance systems using cameras, NIR, sonar, or radar for crop and surface recognition, or row sensors that physically detect the resistance of the crop plants in the row.Furthermore, targeted spraying can be carried out by mapping the areas of the agricultural field where weeds grow or may grow before applying the herbicide (e.g., using proximity or remote sensing procedures) and spraying the compound of the present invention based on the map information. This is useful, for example, when it is not necessary to control all weeds in the agricultural field, but only those growing near the crop plants and competing for nutritional resources. Targeted spraying based on map information requires the use of location determination methods, such as those obtained by RTK-GPS or similar technologies. Spot spraying can also be performed as continuous spraying over the space between rows of row crops or by opening and closing a hydraulic nozzle, respectively, on the liquid feed system of an automatic or manual atomizing disc. Mapping information can be created from images taken by an aerial or ground vehicle, manned or unmanned, or through conventional field reconnaissance operations carried out by farmers. These technologies constitute an emerging form of agriculture known as precision agriculture, smart agriculture, digital agriculture, etc. The partial spraying pattern in an agricultural field, such as that achieved with spot spraying, is also called VRA (Variable Rate Application). The term "crop plants" refers to maize, soybeans, cotton, peanuts, oilseeds from Brassica species such as Brassica napus (e.g., canola), Brassica rapa, B. juncea (e.g., field mustard), and Brassica carinata, rice, wheat, sugar beets, sugarcane, oats, rye, barley, millet, and sorghum, triticale, flax, grapes, and various fruits and vegetables from several botanical taxa, for example Rosaceae sp. (e.g., pome fruits such as apples and pears, but also stone fruits such as apricots, cherries, almonds, and peaches, and berries such as strawberries), Ribesioidae sp., Juglandaceae sp., Betulaceae sp., Anacardiaceae sp., Fagaceae sp., Moraceae sp., Oleaceae sp., Actinidaceae sp., Lauraceae sp., Musaceae sp. (e.g., ginger, banana trees and plantations), Rubiaceae sp. (e.g., coffee), Theaceae sp., Sterculiceae sp., Rutaceae sp. (e.g., lemons, oranges and grapefruits); Solanaceae sp.(for example, tomatoes, potatoes, peppers, eggplants), Liliaceae sp., Compositae sp. (for example, safflower, sunflower, lettuce, artichokes and chicory - including root chicory, endive or common chicory), Umbelliferae sp. (for example, carrots, parsley, celery and celeriac), Cucurbitaceae sp. (for example, cucumbers - including gherkins -, pumpkins, watermelons, squash and melons), Alliaceae sp. (for example, leeks and onions), Cruciferae sp. (for example, white cabbage, red cabbage, broccoli, cauliflower, Brussels sprouts, pak choi, kohlrabi, radishes, horseradish, watercress and Chinese cabbage), Euphorbiaceae (for example, cassava), Leguminosae sp. (for example, peanuts, peas, chickpeas and beans - for example, common beans and broad beans, phaseolus and faba and lentils), Chenopodiaceae sp.(for example, Swiss chard, fodder beet, spinach, beetroot), Malvaceae (for example, okra), Asparagaceae (for example, asparagus); useful and ornamental garden and forest plants; and in each case, genetically modified types of these plants. Within the term crop plants, particularly preferred are corn, soybeans, cotton, sunflower, peanuts, sugar beet, sugar cane, strawberries, Solanaceae sp. (e.g. tomatoes, potatoes, peppers, eggplants), Liliaceae sp., Compositae sp. (e.g. safflower, sunflower, lettuce, artichokes), Umbelliferae sp. (e.g. carrots), Leguminosae sp. (e.g. peanuts, peas, chickpeas and beans - e.g. common beans and broad beans, phaseolus and faba, lentils), Chenopodiaceae sp. (e.g. chard, fodder beet, beetroot), Malvaceae (e.g. okra), Euphorbiaceae (e.g. yucca), Asparagaceae (e.g. asparagus); and in each case, genetically modified types of these plants. As mentioned above, it is possible to treat all plants and parts thereof according to the invention. In a preferred embodiment, wild plant species and plant cultivars, or those obtained by conventional breeding techniques such as crossbreeding or protoplast fusion, and parts thereof, are treated. In another preferred embodiment, transgenic plants and plant cultivars obtained by genetic engineering processes, if applicable in combination with conventional processes (genetically modified organisms), and parts thereof, are treated. The terms "parts" or "plant parts" have been explained above. According to the present invention, preference is given, in particular, to the treatment of plants of the respective common commercial cultivars or those currently in use.Plant cultivars are defined as plants that possess new properties ("traits") developed through conventional breeding, mutagenesis, or recombinant DNA techniques. They can be cultivars, varieties, biotypes, or genotypes. Depending on the plant species or cultivars, their location and growing conditions (soil, climate, growing season, diet), the inventive treatment may also result in superadditive ("synergistic") effects.For example, the following effects are possible that exceed the effects actually expected: reduction of application rates and / or expansion of the spectrum of activity and / or increase in the efficacy of the active ingredients and compositions that can be used according to the invention, better plant growth, greater tolerance to high or low temperatures, greater tolerance to drought or to salinity of water or soil, greater flowering yield, easier harvesting, accelerated ripening, higher crop yield, larger fruits, greater plant height, greener leaf color, earlier flowering, higher quality and / or higher nutritional value of the harvested products, higher sugar concentration in the fruits, better storage stability and / or processability of the harvested products. The plants that can be treated according to the invention are hybrid plants that already express the characteristics of heterosis, or the hybrid effect, which results in generally higher yield, vigor, improved health, and resistance to biotic and abiotic stress factors. These plants are normally produced by crossing a sterile male inbred parent line (the female cross-parent line) with a fertile male inbred parent line (the male cross-parent line). Hybrid seeds are usually collected from the sterile plants and sold to growers. Sterile plants can sometimes be produced (for example, in some cultures) by defoliation (i.e., the mechanical removal of the male reproductive organs or male flowers), but more typically, male sterility is the result of genetic determinants in the plant's genome.In such cases, and especially when seed is the desired product of the hybrid plants, it is often beneficial to ensure that the male fertility of the hybrid plants, which contain the genetic determinants responsible for male sterility, is fully restored. This can be achieved by ensuring that the male parents of the cross possess appropriate fertility-restoring genes capable of restoring male fertility in hybrid plants containing the genetic determinants responsible for male sterility. The genetic determinants of male sterility can be located in the cytoplasm. For example, cytoplasmic male sterility (CMS) has been described in Brassica species. However, the genetic determinants of male sterility can also be located in the nuclear genome.Male-sterile plants can also be obtained through plant biotechnology procedures such as genetic engineering. A particularly useful method for obtaining male-sterile plants is described in WO 89 / 10396, in which, for example, a ribonuclease such as barnase is selectively expressed in the tapetum cells of the stamens. Fertility can then be restored by expressing a ribonuclease inhibitor, such as barstar, in the tapetum cells. The application of spot treatment against weeds as discussed in this document is particularly useful for crop plants that are not resistant to compound (Ia). The terms "where a plurality of crop plants are growing, have been sown, have been transplanted, are to be sown and / or are to be transplanted" refer to the stage at which compound (Ia) can be applied by means of spot weed control in an agricultural field. For example, crop plants have not yet been planted and compound (Ia) is applied by means of spot weed control, for example, in a location where crop plants are to be planted and / or transplanted. Another example: crop plants have been sown, but no seedlings are yet visible. Compound (Ia) can be applied at this stage to a location other than where the crop seeds have been sown (for example, 10 cm, more preferably 5 cm around the planted crop seeds and / or the transplanted crop).It is possible that the geolocation of the crop seeds was recorded during the planting operation and that this information is used to avoid spot treatments, for example, by applying precision agriculture vehicles directly where the crop seeds were planted. As another example, the crop plants are seedlings or are already in a vegetative (or reproductive) growth stage, and compound (Ia) is applied against weeds using a spot treatment as discussed here, for example, with precision agriculture vehicles. The term "transplanting," as used herein, refers to the agricultural technique of moving a crop plant from one location to another. In most cases, this involves sowing a plant from seed under optimal conditions, such as in a greenhouse or protected nursery, and then replanting it in another growing location, usually outdoors. Como ejemplos de las malas hierbas a controlar pueden mencionarse los siguientes: Malas hierbas monocotiledóneas tales como: Digitaria ciliayis (Retz.) Koeler, Eleusine indica (L.) Gaertn., Digitaria sanguinalis (L.) Scop. Setaria viridis (L.) Beauv. var. viridis, Poa annua L., Alopecurus aequalis Sobol. var. amurensis, Imperata cylindrica (L.) Beau., Luzula capitata (Mig.) Mig, Digitaria radicosa (Presl) Mig, Digitaria violascens Link) , Setaria faberii Herrm, Holcus lanatus, Echinocloa, etc. Malas hierbas dicotiledóneas como: Rumex japonicus Houtt., Portulaca oleracea L. var. oleracea, Stellaria neglecta Weihe, Kummerowia striata (Thunb. ex Murray) Schindl., Galinsoga ciliata (Rafin.) Blake, Cerastium glomeratum Thuill., Stellaria alsine Grimm. var. undulata (Thunb. ex Murray) Ohwi, Cardamine flexuosa With., Capsella bursa-pastoris Medicus, Lamium amplexicaule L., Veronica persica Poir., Veronica filiformis, Aster maaekii Regel, Oxalis corniculata L., Hydrocotyle sibthorpioides Lam.Plantago asiatica L., Plantago lanceolata L., Plantago media, Plantago major, Artemisia indica Willd. var. maximowiczii (Nakai) Hara, Rumex acetosa L., Bellis perennis, Achillea millefolia, Crepis capillaris, Amaranthus spp., Prunella vulgaris, Ranunculus repens, Ranunculus acris, Trifolium repens, Trifolium dubium, Potentilla spp., etc. Weeds are considered to be all plants that grow in unwanted places. As a further example, a volunteer crop (a crop growing in a place intended for another crop) can be zoned and controlled according to the use and procedure of the invention. The use of herbicidal compounds (Ia), however, should not be restricted to these weeds in any way, but can be applied against other weeds in the same manner. If the compounds according to the invention are applied to the soil surface before germination (pre-emergence of weeds), then weed seedlings are completely prevented from emerging, or the weeds grow until they reach the cotyledon stage, but then their growth stops and they finally die completely after three to four weeks. When the active substances are applied post-emergence to the green parts of the plants, growth stops over time after treatment, and the weed plants remain in the growth stage at the time of application, or die completely after a certain time. In this way, weed competition, which is detrimental to the crop, is eliminated at a very early stage and in a sustained manner. The activity allows the compounds to be applied as effective herbicidal active ingredients in pre-emergence and post-emergence, in relation to weed emergence, to control broadleaf and grassy weeds. Preferably, compounds (Ia) are applied by means of a localized treatment against weeds in the agricultural field before or after weed emergence. Preferably, compounds (Ia) are applied post-emergence. According to another embodiment of the invention, the compounds (Ia) are applied against weeds by means of spot treatment in an agricultural field, wherein the spot treatment is carried out with hooded spray equipment and / or with drift-reducing nozzle spray equipment. The term "hooded sprayer" refers to sprayers that include a hood or shield around the spraying unit, which can be a hydraulic nozzle or an atomizing disc such as a rotating disc. The purpose of the hood is to ensure that the sprayed liquid is applied to the intended location / target. It can also reduce or prevent drift. Many manufacturers offer this type of equipment, and they are well-known to those skilled in the art. The term "drift-reducing nozzle sprayer" refers to the selective and directed application of spray to weeds without the need for a hood to protect against drift. Suitable nozzles for this purpose can be selected from Turbo TeeJet nozzles; flat fan nozzles such as a Hypro Guardian; Venturi air induction nozzles such as Greenleaf TurboDrop, Greenleaf TurboDrop XL, Greenleaf TurboDrop XL-D, Greenleaf AirMix, Air Bubble Jet, Hardi Injet. TeeJet Air Induction (AI), Turbo TeeJet Induction nozzle, Air Induction XR Flat Fan, Hypro Ultra-Lo-Drift, Hypro AVI, Air-inducing Venturi, Delavan Raindrop Ultra, Hypro Guardian Air. According to another embodiment of the invention, the compounds (Ia) are applied against weeds by spot treatment in an agricultural field, wherein the spot treatment is carried out with a precision agriculture vehicle, preferably a tractor with a mounted sprayer (preferably an armored sprayer), a tractor connected to a tractor-mounted sprayer (preferably an armored sprayer), an unmanned aerial vehicle (UAV) and / or an unmanned ground vehicle (UGV). A precision agriculture vehicle can receive a weed map generated using remote and / or proximity sensing procedures and use it to apply weed control compounds (Ia) via spot treatment. Alternatively, the precision agriculture vehicle may be equipped with sensors to detect weeds (e.g., image sensors) and apply the weed control compounds (Ia) via spot treatment shortly after identifying them.The terms "precision farming vehicle" preferably refer to a tractor with a mounted sprayer (preferably an armored sprayer), a tractor connected to a towed sprayer (preferably an armored sprayer), UAVs and / or UGVs that can apply compounds (Ia) according to the weed map or detect and control weeds by means of spot treatments independently of substantial human intervention. According to another embodiment of the invention, the compounds (Ia) are applied against weeds by spot treatment in an agricultural field, in which application of the compounds (Ia) to the foliar part of the plurality of crop plants in the agricultural field is avoided. The compounds (Ia) according to the invention are generally applied to weed plants or their seeds by treating the locus thereof with an agricultural composition comprising one or more compounds (Ia) or salts thereof. The term "locus" of a plant or plants comprises the plant or plants, part of the plants, the seed of the plants, or the area where the plants grow. The amount of compounds (Ia) to be applied will depend on various factors, such as the object of the treatment, such as plants or soil, the type of treatment, such as spraying or spreading, the purpose of the treatment, such as preventive or curative, the application time, the environmental conditions, or the crop plants in the agricultural field. The application rates of herbicidal compounds (Ia) or their salts can vary widely and generally depend on the spectrum of weeds to be controlled, the soil type, weather conditions, and whether the compounds are combined with other herbicidal active ingredients. Suitable application rates are generally within the range of 0.01 to 2000 g of active ingredient (i.a.) per hectare (a.i. / ha), preferably 0.5 to 500 g a.i. / ha, and more preferably 5 to 200 g a.i. / ha. A spray volume of 10 to 10,000 liters can be applied, preferably 10 to 300 liters per hectare. It is also possible to use compounds (Ia) in combination with other active pesticide substances or nutrients, such as, for example, insecticides, acaricides, herbicides, fungicides, protectants, fertilizers and / or growth regulators or nutrients useful for treating a variety of crop plants against phytopathogenic diseases or for regulating or promoting the growth of a variety of crop plants in the agricultural field. Thus, the invention also relates to a method for spot spraying against weeds in an agricultural field in which a plurality of crop plants are growing, have been sown, have been transplanted, are to be sown and / or are to be transplanted, characterized by the spot spraying application of (A) one or more compounds of formula (Ia) or a salt thereof [herbicides of type (A)], optionally together, before or after the application of one or more active ingredients selected from the group consisting of (B) other herbicides [herbicides of type (B)] useful in the treatment of an agricultural field with a plurality of crop plants, and optionally together, before or after the application of one or more (C) other active ingredients [active ingredients of type (C)] useful in the treatment of an agricultural field with a plurality of crop plants. In one embodiment, herbicides [type (B) herbicides] do not necessarily have to be applied by spot treatment, but can also be applied uniformly, for example, by a blank spray application, if they are selective herbicides and do not harm the crop plants in the agricultural field. The same applies to the other active ingredients [type (C) active ingredients]. In one embodiment, compositions comprising compound (Ia), optionally together with other herbicides [type (B) herbicides] and / or other active ingredients [type (C) active ingredients], can be used for spot treatment in a tank mix. Alternatively, the compounds can be mixed shortly before spot treatment application, for example, in a feed tube for a spray nozzle / atomizing device or through two separate feed tubes on a rotating disc. An advantage of this latter application is that a precision agriculture vehicle can comprise several tanks with different active ingredients and can ad hoc combine different active ingredients depending on what is required to control the identified weeds.It is also possible for the precision agriculture vehicle to apply compound (Ia) against weeds with a spot treatment, but apply other herbicides [type (B) herbicides] and / or other active ingredients [type (C) active ingredients] uniformly, for example, with a general spray application. Type (A) herbicides are compounds of formula (Ia) or their salts. Type (B) herbicides are other useful herbicides to be combined with (Ia) compounds in order to broaden the spectrum of weeds to be controlled or to increase the herbicidal effect (some possible type B herbicides are mentioned later). Type (C) active ingredients may be, for example, insecticides, acaricides, fungicides, protectants, fertilizers and / or growth regulators or nutrients useful for treating a variety of crop plants against phytopathogenic diseases or for regulating or promoting the growth of a variety of crop plants in the agricultural field. Type (B) herbicides are other useful herbicides to be combined with (Ia) compounds in order to broaden the spectrum of weeds to be controlled or to increase the herbicidal effect (some possible type B herbicides are mentioned later). Potential combination partners for inventive active ingredients, in mixed formulations or in a tankmix, are, for example, known active ingredients that are based on the inhibition of, for example, acetolactate synthase, acetyl-coenzyme A carboxylase, PS I, PS II, HPPDO, phytoene desaturase, protoporphyrinogen oxidase, glutamine synthetase, cellulose biosynthesis, 5-enolpyruvylshikimate-3-phosphate synthetase. These compounds, and also other usable compounds, with a mechanism of action that is, in some cases, unknown or different, are described, for example, in Weed Research 26, 441-445 (1986), or "The Pesticide Manual", 14th edition 2006 / 2007, published by the British Crop Protection Council (hereinafter also abbreviated as "PM"), "The e-Pesticide Manual", version 4.02006 / 2007, published by the British Crop Protection Council and the bibliography cited therein,"Compendium of Pesticide Common Names" available on the Internet (http: / / www.alanwood.net / pesticides / ). Herbicides, plant growth regulators, and herbicide protectants known in the literature and which may be combined with the compounds of formula (Ia) include, for example, the following active ingredients (note: compounds are mentioned by their common name in accordance with the International Organization for Standardization (ISO) or by their chemical name, if appropriate, together with a customary code number): acetochlor, acifluorphene, acifluorphen-methyl, acifluorphen-sodium, acloniphene, alachlor, alidochlor, aloxydim, aloxydimsodium, ametryn, amicarbazone, amidochlor, amidosulfuron, 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methylphenyl)-5-fluoropyridine-2-carboxylic acid, aminocyclopyrachlor, aminocyclopyrachlor-potassium, aminocyclopyrachlor-methyl, aminopyralide, aminopyralide-dimethylammonium, aminopyralide-tripromine, amitrole, ammonium sulfamate, anilofos,asulam, asulam-potassium, asulam sodium, atrazine, azaphenidine, azimsulfuron, beflubutamide, (S)-(-)-beflubutamide, beflubutamide-M, benazoline, benazoline-ethyl, benazoline-dimethylammonium, benazoline-potassium, benfluralin, benfuresate, bensulfuron, bensulfuron-methyl, bensulide, bentazone, bentazone-sodium, benzobiciclone, benzophenap, bicyclopyrone, bifenox, bilanafos, bilanafos-sodium, bipyrazone, bispiribac, bispiribac-sodium, bixlozone, bromacil, bromacil-lithium, bromacil-sodium, bromobutide, bromophenoxim, bromoxynyl, bromoxynyl-butyrate, potassium, heptanoate and octanoate, busoxinone, butachlor, butafenacyl, butamiphos, butenachlor, butralin, butroxydin, butylate, cafenstrole, cambendichlor, carbetamide, carfentrazone, carfentrazone-ethyl, chloramben, chloramben-ammonium, chlorambendiolamine, chloramben-methyl, chloramben-methylammonium, chloramben-sodium, chlorbromuron, chlorfenac, chlorfenac-ammonium, chlorfenac-sodium, chlorfenprop, chlorfenprop-methyl, chlorfurenol, chlorfurenol-methyl, chloridazonechlorimuron, chlorimuron-ethyl, chlorophthalim, chlorotoluron, chlorsulfuron, chlortal, chlortal-dimethyl, chlortal-monomethyl, cinidon, cinidonethyl, cinmethylin, exo-(+)-cinmethylin, i.e., (1R, 25, 4S)-4-isopropyl-1-methyl-2-[(2-methylbenzyl)oxy]-7-oxabicyclo[2.2.1]heptane, exo-(-)-cinmethylin, i.e., (1R, 2S, 4S)-4-isopropyl-1-methyl-2-[(2-methylbenzyl)oxy]-7-oxabicyclo[2.2.1]heptane, cinnosulfuron, clacifos, clethodim, clodinafop, clodinafop-ethyl, clodinafop-propargyl, clomazone, clomeprop, clopyralide, clopyralide-methyl, clopyralide-olamin, clopyralide-potassium, clopyralide-trypomine, chloransulam, chloransulam-methyl, cumiluron, cyanamide, cyanozine, cycloate, cyclopyranyl, cyclopyrimorate, cyclosulfamuron, cycloxydim, cyhalofop, cyhalofop-butyl, cyprizanine, 2,4-D (including elammonium, -butotyl, -butyl, -choline, -diethylammonium, -dimethylammonium, -diolamine, -doboxyl, -dodecylammonium, -etexyl, -ethyl, -2-ethylhexyl, -heptylammonium, -isobutyl, -isooctyl, -isopropyl,-isopropylammonium, -lithium, -meptyl, -methyl, -potassium, -tetradecylammonium, -triethylammonium, -triisopropanol ammonium, -tripromine and -trolamine salt thereof), 2,4-DB, 2,4-DB-butyl, -dimethylammonium, -isooctyl, -potassium and -sodium, daimuron (dymron), dalapon, dalapon-calcium, dalapon-magnesium, dalapon-sodium, dazomet, dazomet-sodium, n-decanol, 7-deoxy-D-sedoheptulose, desmedifam, detosylpyrazolate (DTP), dicamba and its salts, e.g. g. dicamba-biproamine, dicamba-N, N-Bis (3-aminopropyl) methylamine, dicamba-butotyl, dicambacoline, dicamba-diglycolamine, dicamba-dimethylammonium, dicamba-diethanolaminemonium, dicamba-diethylammonium, dicamba-isopropylammonium, dicamba-methyl, dicamba-monoethanolaminedicamba-olamine, dicamba-potassium, dicamba-sodium, dicamba-triethanolamine, dichlobenyl, 2-(2,4-dichlorobenzyl)-4,4-dimethyl-1,2-oxazolidin-3-one, 2-(2,5-dichlorobenzyl)-4,4-dimethyl-1,2-oxazolidin-3-one, dichlorprop, dichlorprop-butotyl, dichlorprop-dimethylammonium, dichlorpropetexil,dichlorprop-ethylammonium, dichlorprop-isooctyl, dichlorprop-methyl, dichlorprop-potassium, dichlorprop-sodium, dichlorprop-P, dichlorprop-P-dimethylammonium, dichlorprop-P-ethexyl, dichlorprop-P-potassium, dichlorprop-sodium, diclofop, diclofop-methyl, iclofop-P, diclofop-P-methyl, diclosulam, difenzoquat, difenzoquat-methylsulfate, diflufenican, diflufenzopyr, diflufenzopyr-sodium, dimefurón, dimepiperate, dimesulfazet, dimetachlor, dimethamethrina, dimethenamid, dimethenamid-P, dimetrasulfurón, dinitramine, dinoterb, dinoterb-acetate, difenamide, diquat, diquat-dibromide, diquat-dichloride, dithiopyr, diurón, DNOC, DNOC-ammonium, DNOC-potassium, DNOC-sodium, endotal, endotal-diammonium, endotal-dipotasium, endotal-disodium, Epyrifenacil (S-3100), EPTC, esprocarb, ethalfluralin, ethametsulfuron, ethametsulfuron-methyl, ethiozin, ethofumesate, ethoxyfen, ethoxyfen-ethyl, ethoxysulfuron, etobenzanid, F-5231, ie N-[2-Chlor-4-fluoro-5-[4-(3-fluoropropyl)-4, 5-dihydro-5-oxo-1H-tetrazol-1-yl]-phenyl]-ethanesulfonamide, F-7967,that is, 3-[7-Clor-5-fluor-2- (trifluoromethyl) -1H-benzimidazol-4-yl]-1-methyl-6- (trifluoromethyl)pyrimidin-2, 4 (1H, 3H) -dion, fenoxaprop, fenoxaprop-P, fenoxaprop-ethyl, fenoxaprop-P-ethyl, fenoxasulfone, fenpyrazone, phenquinotrione, fentrazamide, flamprop, flamprop-isoproyl, flamprop-methyl, flamprop-M-isopropyl, flamprop-M-methyl, flazasulfuron, florasulam, florpirauxifen, florpyrauxifen-benzyl, fluazifop, fluazifop-butyl, fluazifop-methyl, fluazifop-P, fluazifop-P-butyl, flucarbazone, flucarbazone-sodium, flucetosulfuron, fluchloraline, flufenacet, flufenpyr, flufenpyr-ethyl, flumetsulam, flumiclorac, flumiclorac-pentyl, flumioxazine, fluometuron, flurenol, flurenol-butyl, -dimethylammonium and -methyl, fluoroglycophene, fluoroglycophen-ethyl, flupropanate, flupropanate-sodium, flupirsulfuron, flupirsulfuron-methyl, flupirsulfuron-methyl-sodium, fluridone, flurochloridone, fluroxypyr, fluroxypyr-butomethyl, fluroxypyr-meptyl, flurtamone, fluthiacet, fluthiacet-methyl, fomesafenfomesafen-sodium, foramsulfuron, sal sódica de foramsulfurón, fosamine, fosamine-amonio, glufosinato, glufosinato-amonio, glufosinato-sodio, L-glufosinato-amonio, L-glufosiante-sodio, glufosinato-P-sodio, glufosinato-P-amonio, glyphosate, glyphosate-amonio, isopropyl¬amonio, diamonio, -dimetilamonio, -potasio, -sodio, sesquisodio y - trimesio, H-9201, es decire. O-(2, 4-Dimethyl-6-nitrophenyl)-O-ethyl-isopropylphosphoramidothioate, halauxifeno, halauxifeno-methylo, halosafeno, halosulfurón, halosulfurón-methylo, haloxifop, haloxifop-P, haloxifop-ethoxyethyl, haloxifop-P-ethoxyethyl, haloxifop-methylo, haloxifop-P-methylo, haloxifopsodio, hexazinona, HNPC-A8169, e.g. decir prop-2-yn-1-yl (2S) -2-{3-[ (5-terc-butylpyridin-2-yl) oxi]phenoxy}propanoate, HW-02, e.g. decir 1- (Dimethoxyphosphoryl) -ethyl- (2, 4-dichlorphenoxy) acetate, hidantocidin, imazametabenz, imazametabenz-methyl, imazamox, imazamox-amonio, imazapico, imazapico-amonio, imazapir, imazapyr-isopropylamonio, imazaquin, imazaquin-amonio,imazaquin.methyl, imazethapyr, imazethapyr-immonium, imazosulfuron, indanofan, indaziflam, iodosulfuron, iodosulfuron-methyl, iodosulfuron-methyl-sodium, ioxynil, ioxynil-lithium, -octanoate, -potassium und -sodium, ipfencarbazone, isoproturon, isouron, isoxaben, isoxaflutole, karbutilate, KUH-043, i.e. 3- ({[5- (difluormetil) -1-metil-3- (trifluormetil) -1H-pirazol-4-il]metil}sulfonil) -5, 5-dimetil-4, 5-dihidro-1, 2-oxazol, ketospiradox, ketospiradox-potasio, lactofen, lenacil, linuron, MCPA, MCPA-butotyl, -butyl, -dimethylammonium, -diolamine, -2-ethylhexyl, -ethyl, -isobutyl, isoctyl, -isopropilo, -isopropilamonio, -metilo, olamina, -potasio, -sodio y -trolamina, MCPB, MCPB-metilo, etilo y -sodio, mecoprop, mecoprop-butilo, mecopropmetilamonio, mecoprop-diolamina, mecoprop-etexilo, mecoprop-etadilo, mecoprop-isoctilo, mecoprop-metilo, mecoprop-potasio, mecoprop-sodio y mecoprop-trolamina, mecoprop-P, mecoprop-P-butilo, - dimetilamonio, -2-etilhexilo y -potasio, mefenacet,mefluidide, mefluidide-diolamine, mefluidide-potassium, mesosulfuron, mesosulfuron-methyl, mesosulfuron sodium salt, mesotrione, metabenzthiazure, metam, metamifop, metamitron, metazachlor, metazosulfuron, metabenzthiazure, methiopyrsulfuron, methiazoline, methyl isothiocyanate, methobromuron, metolachlor, S-metolachlor, metosulam, methoxuron, metribuzin, metsulfuron, metsulfuron-methyl, molinate, monolinuron, monosulfuron, monosulfuron-methyl, MT-5950, i.e., N-[3-methyl chloride].e. N-[3-chloro-4-(1-methylethyl)-phenyl]-2-methylpentanamide, NGGC-011, napropamide, NC-310, i.e. 4-(2,4-dichlorobenzoyl)-1-methyl-5-benzyloxypyrazole, NC-656, i.e. 3-[(isopropylsulfonyl)methyl]-N-(5-methyl-1,3,4-oxadiazol-2-yl)-5-(trifluoromethyl)[1,2,4]triazolo[4,3-a]pyridine-8-carboxamide, neburon, nicosulfuron, nonanoic acid (pelargonic acid), norflurazone, oleic acid (fatty acids), orbencarb, orthosulfamuron, oryzaline, oxadiargil, oxadiazone, oxasulfuron, oxaziclomefon,oxifluorfeno, paraquat, dicloruro de paraquat, dimethylsulfato de paraquat, pebulate, pendimetalina, penoxsulam, pentachlorfenol, pentoxazona, petoxamida, aceites de petróleo, fenmedifam, fenmedifam-etilo, picloram, picloram-dimetilammonio, picloram-etexilo, picloram-isoctilo, picloram-metilo, picloramolamina, piclorampotasio, picloram-trietilamonio, picloram-tripromina, picloram-trolamina, picolinafeno, pinoxaden, piperofós, pretilacloro, primisulfurón, primisulfurón-metilo, prodiamina, profoxidim, prometón, prometrina, propacloro, propanilo, propaquizafop, propazina, profam, propisocloro, propoxicarbazona, propoxicarbazonasodio, propirisulfurón, propizamida, prosulfocarb, prosulfurón, piraclonil, pirafflufeno, piraflufeno-etilo, pirasulfotol, pirazolinato (pirazolato), pirazosulfurón, pirazosulfurón-etilo, pirazoxifeno, piribambenz, piribambenz-isopropilo, piribenzoxim, piributicarb, piridafol, piridato, piriftalid, piriminobac, piriminobac-metilo, pirimisulfan,pirithiobac, pirithiobac-sodium, pyroxasulfona, piroxsulam, quinclorac, quinclorac-dimethylamonium, quinclorac-methyl, quinmerac, quinoclamine, quizalofop, quizalofop-ethyl, quizalofop-P, quizalofop-P-ethyl, quizalofop-P-tefuryl, QYM201, es decide. 1-{2-chloro-3-[(3-cyclopropyl-5-hidroxi-1-methyl-1H-pyrazol-4-yl) carbonyl]-6- (trifluoromethyl) phenyl} piperidin-2-ona, rimsulfurón, saflufenacilo, setoxidim, sidurón, simazine, simetrina, SL-261, sulcotrione, sulfentrazona, sulfometurón, sulfometurón-methylo, sulfosulfurón, SYP-249, es decire. 1-Ethoxy-3-methyl-1-oxobut-3-en-2-yl-5-[2-chlor-4- (trifluormethyl) phenoxy]-2-nitrobenzoat, SYP-300, i.e. 1-[7-Fluor-3-oxo-4- (prop-2-in-1-yl) -3, 4-dihydro-2H-1, 4-benzoxazin-6-yl]-3-propyl-2-thioxoimidazolidin-4, 5-dion, 2, 3, 6-TBA, TCA (trichloroacetic acid) and its sales, for example TCA-amonium, TCA-calcium, TCA-ethyl, TCA-magnesium, TCA-sodium, tebutiurón, tefuryltrione, tembotriona, tepral¬oxidim, terbacil, terbucarb, terbumetón, terbuthylazine,terbutr yn, tetflupyrolimet, thaxtomin, thenylchlor, thiazopyr, thiencarbazone, thiencarbazone-methyl, thifensulfuron, thifensulfuron-methyl, thiobencarb, tiafenacil, tolpyralate, topramezone, tralcoxidim, triafamona, trialate, triasulfuron, triaziflam, tribenuron, tribenuron-methyl, triclopyr, triclopyr-butyl, triclopyr-choline, triclopyr-ethyl, triclopyr-triethylammonium, trietazine, trifloxysulfuron, trifloxysulfuron-sodium, trifludimoxazine, trifluralin, triflusulfuron, triflusulfuron-methyl, tritosulfuron, urea sulfate, vernolate, XDE-848, ZJ-0862, ie 3, 4-dichloro-N-{2-[(4,6-dimethoxypyrimidin-2-yl)oxy]benzyl}aniline, ethyl ester of 3-(2-chloro-4-fluoro-5-(3-methyl-2,6-dioxo-4-trifluoromethyl-3,6-dihydropyrimidin-1(2H)-yl)-5-methyl-4,5-dihydroisoxazol-5-carboxylic acid, 3-chloro-2-[3-(difluoromethyl)isoxazolyl-5-yl]phenyl-5-chloropyrimidin-2-yl ether, 2-(3,4-dimethoxyphenyl)-4-[(2-hydroxy-6-oxocyclohex-1-en-1-yl)carbonyl]-6-methylpyridazine-3(2H)-one,2- ({2-[ (2-methoxyethoxy) methyl]-6-methylpyridin-3-yl}carbonyl) cyclohexane-1, 3-diona, (5-hidroxi-1-methyl-1H-pyrazol-4-yl) (3, 3, 4-trimethyl-1, 1-dioxido-2, 3-dihydro-1-benzothiopheno-5-yl) methanone, 1-methyl-4-[ (3, 3, 4-trimethyl-1, 1-dioxido-2, 3-dihidro-1-benzothiophen-5-yl) carbonyl]-1H-pyrazol-5-yl propane-1-sulfonate, 4-{2-chloro-3-[ (3, 5-dimethyl-1H-pyrazol-1-yl) methyl]-4- (methylsulfonyl) benzoyl}-1-methyl-1H-pyrazol-5-yl 1, 3-dimethyl-1H-pyrazol-4-carboxylate; 4-amino-3-chloro-5-fluoro-6- (7-fluoro-1H-indol-6-yl) pyridine-2-carboxylate de cyanometilo, 4-amino-3-chloro-5-fluoro-6- (7-fluoro-1H-indol-6-yl) pyridine-2-carboxylate de prop-2-yn-1-yl, 4-amino-3-chloro-5-fluoro-6- (7-fluoro-1H-indol-6-yl) pyridine-2-carboxylate de metilo, ácido 4-amino-3-chloro-5-fluoro-6- (7-fluoro-1H-indol-6-yl) pyridine-2-carboxylic acid, 4-amino-3-chloro-5-fluoro-6- (7-fluoro-1H-indol-6-yl) pyridine-2-carboxylic acid benzyl, 4-amino-3-chloro-5-fluoro-6-(7-fluoro-1H-indol-6-yl)pyridine-2-carboxylate de ethyl,4-amino-3-chloro-5-fluoro-6-(7-fluoro-1-isobutyryl-1H-indol-6-yl)pyridine-2-carboxylate de methyl, 6-(1-acetyl-7-fluoro-1H-indol-6-yl)-4-amino-3-chloro-5-fluoropyridine-2-carboxylate de methyl, 4-amino-3-chloro-6-[1-(2, 2-dimethylpropanoyl)-7-fluoro-1H-indol-6-yl]-5-fluoropyridine-2-carboxylate de methyl, 4-amino-3-chloro-5-fluoro-6-[7-fluoro-1-(methoxyacetyl)-1H-indol-6-yl]pyridine-2-carboxylate de methyl, 4-amino-3-chloro-5-fluoro-6- (7-fluoro-1H-indol-6-yl) potassium pyridine-2-carboxylate, 4-amino-3-chloro-5-fluoro-6- (7-fluoro-1H-indol-6-yl) sodium pyridine-2-carboxylate, 4-amino-3-chloro-5-fluoro-6- (7-fluoro-1H-indol-6-yl) butyl pyridine-2-carboxylate, 4-hydroxy-1-methyl-3-[4-(trifluoromethyl)pyridin-2-yl]imidazolidin-2-one, 3-(5-tert-butyl-1, 2-oxazol-3-yl)-4-hydroxy-1-methylimidazolidin-2-one., Preferred herbicide combinations (A) + (B) comprise one or more of the compounds of formula (Ia) or salts thereof (= herbicides (A)) with herbicides (B) selected from the group consisting of, for example, carbamates, thiocarbamates, haloacetanilides, substituted derivatives of phenoxy-, naphthoxy- and phenoxyphenoxycarboxylic acids and heteroaryloxyphenoxyalkanecarboxylic derivatives, such as esters of quinolyloxy-, quinoxalyloxy-, pyridyloxy-, benzoxazolyloxy- and benzothiazolyloxyphenoxyalkanecarboxylic acids, cyclohexanedione oximes, benzoylcyclohexanediones, benzoylisoxazoles, benzoylpyrazoles, imidazolinones, pyrimidinyloxypyridinocarboxylic acid derivatives, pyrimidiloxybenzoic acid derivatives, sulfonylureas, sulfonylaminocarbonyltriazolinones, triazolopyrimidinesulfonamide derivatives, phosphinic acid derivatives and their salts, glycine derivatives, triazolinones,triazinones and also S-(N-aryl-N-alkylcarbamoylmethyl) dithiophosphoric esters, pyridinocarboxylic acids, pyridines, pyridinocarboxamides, 1, 3, 5-triazines and others. In the present specification, preference is given to combinations of herbicides (A) + (B) comprising one or more of the compounds of formula (Ia) or salts thereof (= herbicides (A)) with herbicides (B) selected from the group consisting of diflufenican, glufosinate, glyphosate, paraquat, diquat, aclonifen, oxadiazon, oxadiargyl, pyraflufen, pyraflufen-ethyl, flufenacet, indaziflam, pyroxasulfone, rimsulfuron, acetochlor, dimethanamide, petoxamide, isoxabene, diclobenylfluridon, flurochloridon, flurtamone, fluometuron, saflufenacil, triflumioxazine, oxyflurophen, SYN-523 as [[3-[2-Chlor-5-[3, 6-dihydro-3-methyl-2, 6-dioxo-4- (trifluoromethyl)-1 (2H)-pyrimidinyl]-4-fluorophenoxy]-2-pyridinyl]oxy]-ethyl ester of acetic acid, etofumesate, phenmedifam, dicamba, 2,4-D, tembotrione, mesotrione, as well as esters and salts of these compounds (where applicable). Some of these compounds belong to the same structural type or the same mode of action, or both. In such cases, the herbicidal properties of combinations (A) with other herbicides (B) are similar if these herbicides belong to the same structural type and / or mode of action compared to the herbicide combinations (A) + (B) specifically mentioned above and below. The salts are generally agriculturally applicable salts, preferably metallic salts such as alkali metal salts, or optionally substituted ammonium salts such as ammonium salts, mono-, di- or tri-alkyl or hydroxyalkylammonium salts. The preferred combinations (A) + (B) are selected from the above combinations in which (A) is a racemic compound from Table 1 having the number A (1, 26) , (A1, 68) (or a mixture of two or more of such compounds). The weight ratio of Compound(s) (A) to pesticide can be varied within wide limits, and its optimum weight ratio depends on both the Compound(s) (A) and pesticide used and the type of plants being treated. The weight ratio of compound(s) (A) to compound(s) (B) is, for example, 1000:1 to 1:1000, preferably 200:1 to 1:200, and in particular 100:1 to 1:100. If the compounds are combined with other herbicidal active ingredients (B), the practical application rates of herbicides (A) can generally be reduced, preferably in the range of 0.01 to 2000 g of active ingredient (= compounds (I)) per hectare (ai / ha), preferably from 0.5 to 500 g ai / ha, more preferably from 5 to 200 g ai / ha. The combined application rates of compounds (A) + (B) are preferably between 0.01 and 3000 g ai / ha, more particularly between 0.02 and 1000 g ai / ha. Another object of the invention is the advantageous use of the above herbicide combinations for the application of spot treatment against weeds in an agricultural field in which a plurality of crop plants grow, have been sown, have been transplanted, are to be sown and / or are to be transplanted. Another advantageous property found for the combination of herbicides (A) and (B) according to the invention is that the active compounds (A) and (B) are compatible with each other; that is, they can be used together without substantial chemical incompatibilities between the active compounds (A) and / or (B) that would lead to the breakdown of one or more of them. This prevents a reduction in the active compound content in the spray formulations or liquors. The favorable compatibility also extends to the biological properties of the active compounds when applied in combination. Therefore, antagonistic effects in weed control are generally not observed with the combinations of active compounds according to the invention. Consequently, the active compounds (A) and (B) are particularly suitable for joint or additional application with other active crop protection agents or agrochemicals.The potential for combined application allows for the exploitation of advantageous effects, such as broadening the spectrum of weeds that need to be controlled or eradicated in a single application, and reducing the application rate of individual herbicides (A) and / or (B) compared to the respective application rate of the herbicide in question in a single application. This allows for influencing the degradation properties of the active compounds and achieving more favorable conditions for replanting the crops. Another advantage is that the development of resistance in weeds to the active compounds can often be substantially reduced or prevented by combining active compounds with different mechanisms of action. In particular, and surprisingly, there are also superadditive (= synergistic) effects when active compounds (A) and (B) are applied in combination with a relatively large number of economically important weeds. In this case, the activity of the combination is greater than the expected sum of the activities of the individual herbicides used. The synergistic effects allow for further reduction in application rates, control of a broader spectrum of broadleaf and grassy weeds, faster onset of herbicidal action, longer persistence, better control of harmful plants with only one or a few applications, and an extended application period. To some extent, the use of these formulations also reduces the amount of harmful ingredients, such as nitrogen or oleic acid, and their release into the soil. The aforementioned properties and advantages are desirable for weed control practices to keep agricultural crops free of unwanted competing plants, thereby ensuring and / or increasing yield levels both qualitatively and quantitatively. These novel combinations significantly surpass the state of the art with respect to the described properties. Synergistic effects are observed when the active compounds (A) and (B) are applied together; however, they can also frequently occur when the compounds are applied as a split, spot-treatment application over time. Another possibility is spot-treatment application of herbicides (A) or (B), or combinations of herbicides (A) and (B), in multiple applications (sequential application). For example, one or more pre-emergence applications may be followed by a post-emergence application, or an early post-emergence application may be followed by mid- or late post-emergence applications. Simultaneous or near-simultaneous application of the active compounds in the combination is preferred, if applicable, in multiple applications. However, it is also possible to apply the individual active compounds of a combination at different times, which may be advantageous in each specific case.It is also possible to integrate other plant protection agents into the application system, such as, for example, the other active compounds mentioned (other herbicides, fungicides, insecticides, acaricides, etc.) and / or various auxiliaries, adjuvants and / or fertilizers. The application by means of the pre-emergence or post-emergence procedure should be understood, depending on the context in which the terms are used, as the application of the active compounds before or after the time when the harmful plants become visible above the ground, respectively, or the application of the active compounds against the harmful plants before the emergence of the crop plants and after the emergence of the crop plants, respectively. Herbicides (A), optionally in combination with herbicides (B), may also be applied together with other active ingredients of type (C). Type (C) active ingredients are selected from the group consisting of insecticides, acaricides, fungicides, protectants, fertilizers and / or growth regulators or nutrients useful for treating a plurality of crop plants against phytopathogenic diseases or for regulating or promoting the growth of a plurality of crop plants in the agricultural field, and optionally, formulation aids. The above combinations also optionally or preferably include protectants as components (C). Protectants are already mentioned in the context of herbicide combinations. Examples of protectants are: Benoxacor, Cloquintocet (-mexyl), Cyometrinil, Cyprosulfamide, Dichlormid, Fenclorim, Fenclorazol (-ethyl), Flurazol, Fluxofenim, Furilazol, Isoxadifen (-ethyl), Mefenpyr (-diethyl), Naphthalic anhydride, Oxabetrinil, "AD-67" or "MON 4660" (= 3-Dichloracetyl-1-oxa-3-aza-spiro[4, 5]decane) (1-methyl-1-phenylethyl) -3-p-tolyl-harnstoff) , "Cumiluron" = "JC-940" (= 3- (2-chlorophenylmethyl) -1- (1-methyl-1-phenyl-ethyl) harnstoff) , preferably Benoxacor, Cloquintocet (-mexyl) , Cyprosulfamide, Isoxadifen (-ethyl) or Mefenpyr (-diethyl) . Compounds of formula (Ia) or combinations with other active ingredients (B) and / or (C) can be formulated in various ways, depending on the predominant biological and / or physicochemical parameters.Examples of possible suitable formulations are: wettable powders (WP), water-soluble powders (SP), water-soluble concentrates, emulsifiable concentrates (EC), emulsions (EW) such as oil-in-water and water-in-oil emulsions, sprayable solutions, suspension concentrates (SC), oil-based or water-based dispersions, oil-miscible solutions, suspensions in capsules (CS), powders (DP), seed treatment products, broadcast and soil application granules, granules (GR) in the form of microgranules, spray granules, coated granules and adsorption granules, water-dispersible granules (WG), water-soluble granules (SG), ULV formulations, microcapsules, and waxes. These individual formulation types are known in principle and are described, for example, in: Winnacker-Küchler, "Chemische Technologie", volume 7, C. Hauser Verlag Munich, 4th edition, 1986; van Valkenburg, "Pesticide Formulations", Marcel Dekker NY, 1973; K. Martens, "Spray Spraying Handbook", 3rd Ed. 1979, G. Goodwin Ltd. London. The necessary formulation aids such as inert materials, surfactants, solvents, and other additives are also known and described, for example, in: Watkins, "Handbook of Insecticide Dust Diluents and Carriers", 2nd Ed., Darland Books, Caldwell NJ; Hv Olphen, "Introduction to Clay Colloid Chemistry", 2nd Ed., J. Wiley & Sons, NY; C. Marsden, "Solvents Guide", 2nd Ed., Interscience, NY1963; McCutcheon's, "Detergents and Emulsifiers Annual", MC Publ. Corp., Ridgewood NJ; Sisley and Wood, "Encyclopedia of Surface Active Agents", Chem. Publ. Co. Inc., NY1964; Schönfeldt, "Grenzflächenaktive Äthylenoxidadukte" [Surfactant ethylene oxide adducts], Wiss. Verlagsgesellschaft, Stuttgart 1976, Winnacker-Küchler, "Chemische Technologie", Volume 7, C. Hauser Verlag Munich, 4th Edition 1986.1986 Based on these formulations, it is also possible to prepare combinations with other active pesticide substances (C) such as insecticides, acaricides, herbicides, fungicides, and with protectants, fertilizers and / or growth regulators, for example in the form of a premix or tank mix. Wettable powders are preparations that are uniformly dispersed in water and that, in addition to the compounds of formula (Ia), also comprise ionic and / or non-ionic surfactants (wetting agents, dispersants), for example, polyoxyethylated alkylphenols, polyoxyethylated fatty alcohols, polyoxyethylated fatty amines, fatty alcohol polyglycol ether sulfates, alkanesulfonates or alkylbenzenesulfonates, sodium lignosulfonate, sodium 2,2'-dinaphthylmethane-6,6'-disulfonate, sodium dibutylnaphthalenesulfonate or sodium oleoylmethyltaurinate, in addition to a diluent or inert substance. In order to prepare wettable powders, the compounds of formula (Ia) are ground, for example, finely in conventional apparatus such as hammer mills, blow mills and air jet mills and are mixed with the formulation auxiliaries, either concomitantly or afterwards.Emulsifiable concentrates are prepared, for example, by dissolving the compounds of formula (Ia) in an organic solvent, for example butanol, cyclohexanone, dimethylformamide, xylene or other aromatics or hydrocarbons of higher boiling point or mixtures thereof, with the addition of one or more ionic and / or non-ionic surfactants (emulsifiers). Emulsifiers that can be used include, for example: calcium salts of alkylarylsulfonic acids, such as calcium dodecylbenzenesulfonate, or non-ionic emulsifiers, such as polyglycol esters of fatty acids, alkylaryl polyglycol ethers, polyglycol ethers of fatty alcohols, propylene oxide / ethylene oxide condensates, alkyl polyethers, sorbitan esters such as sorbitan fatty acid esters or polyoxyethylene sorbitan esters such as polyoxyethylene sorbitan fatty acid esters. The powders are obtained by grinding the active substance with finely divided solid substances, for example talc or natural clays, such as kaolin, bentonite or pyrophyllite, or diatomaceous earth. Concentrated suspensions can be water-based or oil-based. They can be prepared, for example, by wet milling with commercially available bead mills, if appropriate, with the addition of surfactants, as mentioned previously, for example, in the case of the other formulation types. Emulsions, for example, oil-in-water (EW) emulsions, can be prepared, for example, by agitators, colloid mills, and / or static mixing using aqueous organic solvents and, if appropriate, surfactants, as mentioned previously, for example, in the case of the other formulation types.The granules can be prepared by spraying the compounds of formula (Ia) onto an adsorbent granular inert material or by applying concentrated active substances onto the surface of supports such as sand, kaolinite, or granular inert material, using binders such as polyvinyl alcohol, sodium polyacrylate, or alternatively, mineral oils. Suitable active substances can also be granulated in the conventional manner for the production of fertilizer granules, if desired, in a mixture with fertilizers. Water-dispersible granules are generally prepared by conventional processes such as spray drying, fluidized bed granulation, disc granulation, mixing in high-speed mixers, and extrusion without solid inert material. For preparation of disc, fluidized bed, extruder, and spray granules, see, for example, the processes in "Spray-Drying Handbook," 3rd ed., 1979, G. Goodwin Ltd., London; J.E. Browning, "Agglomeration," Chemical and Engineering, 1967, p. 147 ff.; and "Perry's Chemical Engineer's Handbook," 5th ed., McGraw-Hill, New York, 1973, pp. 8–57. For further details on the formulation of plant protection products, see, for example, GC Klingman, "Weed Control as a Science", John Wiley and Sons, Inc., New York, 1961, pages 81-96 and JD Freyer, SA Evans, "Weed Control Handbook", 5th Ed., Blackwell Scientific Publications, Oxford, 1968, pages 101-103. As a general rule, agrochemical preparations comprise from 0.1 to 99% by weight, and in particular from 0.1 to 95% by weight, of compounds of formula (Ia). The concentration of compounds of formula (Ia) in wettable powders is, for example, approximately 10 to 90% by weight, with the remainder, up to 100% by weight, consisting of common formulation components. In the case of emulsifiable concentrates, the concentration of compounds of formula (Ia) can range from approximately 1 to 90%, preferably from 5 to 80% by weight. Powder formulations typically comprise 1 to 30% by weight of compounds of formula (Ia), preferably in most cases 5 to 20% by weight of compounds of formula (Ia), while sprayable solutions comprise approximately 0.05 to 80, preferably 2 to 50% by weight of compounds of formula (Ia).In the case of water-dispersible granules, the content of compounds of formula (Ia) depends in part on whether the compounds of formula (Ia) are in liquid or solid form and on what granulation aids, fillers, and the like are being used. Water-dispersible granules, for example, comprise between 1 and 95% by weight of active substance, preferably between 10 and 80% by weight. In addition, the compound formulations of formula (Ia) mentioned include, where applicable, the adhesives, wetting agents, dispersants, emulsifiers, penetrants, preservatives, antifreeze, solvents, fillers, carriers, colorants, antifoaming agents, evaporation inhibitors, pH regulators and viscosity regulators that are conventional in each case. The compounds of formula (Ia) or their salts may be used as such or in the form of their preparations (formulations) as combinations with other active pesticide substances, such as, for example, insecticides, acaricides, nematicides, herbicides, fungicides, protectants, fertilizers and / or growth regulators, for example as a premix or as tank mixes. Examples of formulation. a) A powder is obtained by mixing 10 parts by weight of a compound of formula (Ia) and 90 parts by weight of talc as inert material and grinding the mixture in a hammer mill. b) A wettable powder that is easily dispersible in water is obtained by mixing 25 parts by weight of a compound of formula (Ia), 64 parts by weight of quartz containing kaolin as an inert material, 10 parts by weight of potassium lignosulfonate and 1 part by weight of sodium oleoylmethyltaurinate as a wetting and dispersant and grinding the mixture in a spiked disc mill. c) A water-dispersible dispersion concentrate is obtained by mixing 20 parts by weight of a compound of formula (Ia) with 6 parts by weight of alkylphenol polyglycol ether (®Triton X 207), 3 parts by weight of isotridecanol polyglycol ether (8 EO) and 71 parts by weight of paraffinic mineral oil (boiling range, for example, approx. 255 to over 277°C) and grinding the mixture in a ball mill to a fineness of less than 5 microns. d) An emulsifiable concentrate is obtained from 15 parts by weight of a compound of formula (I), 75 parts by weight of cyclohexanone as a solvent and 10 parts by weight of oxyethylated nonylphenol as an emulsifier. e) Water-dispersible granules are obtained by mixing 75 parts by weight of a compound of formula (I), 10 parts by weight of calcium lignosulfonate, 5 parts by weight of sodium lauryl sulfate, 3 parts by weight of polyvinyl alcohol and 7 parts by weight of kaolin, Grind the mixture in a disc mill and granulate the powder in a fluidized bed by spraying water as the granulation liquid. f) Alternatively, water-dispersible granules are obtained by homogenization and pre-comminution in a colloid mill, 25 parts by weight of a compound of formula (I), 5 parts by weight of sodium 2,2'-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 water, Subsequently, grind the mixture in a ball mill and atomize and dry the resulting suspension in a spray tower using a single-substance nozzle. Biological examples (only cases involving compound A 1.26 or compound A 1.68 are in accordance with the present invention). Example 1: Sunflower (HELAN), maize (ZEAMD), and soybean (GLXMA) were planted in a standard planting system with 30 row spacing and grown until reaching BBCH growth stages of 1-18, 1-13, and 14, respectively. Application was carried out using a pressurized CO2 backpack sprayer and a two-nozzle hand boom, operating at 2.75 bar. Each nozzle (TeeJet Extended Air Induction nozzle 0015) was fitted with a plastic hood that covered a 38 cm band to the left and right of each crop row, preventing unintentional spray drift outside the band. The spray solution covered a band of approximately 38 cm on each side of the crop row, with an average distance of 8 cm to the center of the row and a distance of 2 to 10 cm between the soil surface and the bottom end of the spray screen.The application was carried out under moist soil conditions and a wind speed of 0–10 km / h. All treatments included 1.5 L of a methylated seed oil (MSO) salt source and 2 kg / ha of ammonium sulfate (AMS), mixed in a 1 L fraction of a spray solution equivalent to 187 L / ha. Crop damage assessments were performed as visual evaluations at 15, 28, and 45 days after application (DAA) for sunflower and soybean, and at 14 and 27 DAA for corn. Assessments were also performed on soybeans at 15, 25, and 44 DAA, as shown in Table 5. Crop damage was assessed visually on a percentage scale relative to the untreated control (100% = all plants dead; 50% = green plant biomass reduced by 50%, and 0% = no perceptible difference = like the control plot).Tables 2 to 5 show that the compounds of the invention control weeds and cause no or minor damage to the tested crops. The comparative herbicide compounds (Tembotrione + Isoxadifen-Ethyl and Glyphosate + Isoxaflutole) show—with the exception of corn—significant damage to the crops when applied as described above. Table 2: Table 3: Table 4: Table 5: Example 2: In a second series of trials, soybean seeds (GLXMA) were planted in a standard planting system with a row spacing of 30 cm and grown until they reached a BBCH growth stage of 1–12, or approximately 12 cm average height. Application was carried out using a pressurized CO2 backpack sprayer and a 6-nozzle hand boom, operating at 2.5 bar. Application was performed under moist soil conditions and a wind speed of 0–15 km / h. During the actual spraying, the crop rows were covered using inverted metal rain gutters (10 cm x 10 cm deep x wide) that covered the crop and the soil below, extending approximately 5 cm on each side from the center of the crop row.All treatments included 1.5 L of a methylated seed oil (MSO) salt source and 2 kg / ha of ammonium sulfate (AMS) and were mixed in a 1 L fraction of a spray solution equivalent to 200 L / ha. Crop damage assessments were performed as visual evaluations at 7, 14, 28, and 42 days after application (DAA). Crop damage was assessed visually on a percentage scale relative to the untreated control (100% = all plants dead; 50% = green plant biomass reduced by 50%; and 0% = no perceptible difference = same as the control plot). Table 6 shows that the compounds of the invention do not cause any crop damage when applied as described above. Table 6: Example 3: In a third set of trials, pepper plants (Capsicum frutescens L., CPSFR) at BBCH stage 13 were manually transplanted into a field and grown until they reached BBCH stage 14 or approximately 10 cm average crop height. Application was carried out using a compressed air sprayer and a hand-held, single-nozzle spray lance. The nozzle was protected by a spray screen to prevent unintentional spray drift during application. Application was performed under moist soil and calm wind conditions around each pepper plant. The plants were protected from spray drift during application, and the spray slurry only reached the soil and weed cover surrounding the pepper plants.Crop damage assessments were performed using visual evaluations at 7, 14, 28, and 42 days post-application (DPA). Crop damage was visually assessed on a percentage scale relative to the untreated control (100% = all plants dead; 50% = green plant biomass reduced by 50%; and 0% = no perceptible difference = same as the control plot). Table 7 shows that the compounds of the invention do not cause any crop damage when applied as described above. Table 7:

Claims

1. Use of one or more compounds of formula (Ia) or salts thereof, wherein X3, X5, R3 and Z-4a are as follows: wherein Z-1a means: and wherein Z-4a means the mixture of both structures Z-4b and Z-4c; for the application of a spot treatment against weeds in an agricultural field in which a plurality of cultivated plants are growing, have been sown, have been transplanted, are to be sown and / or are to be transplanted. 2.Use according to claim 1, characterized by the application in a localized weed treatment of (A) one or more compounds of formula (Ia) or a salt thereof [herbicides of type (A)], optionally together, before or after the application of one or more active ingredients selected from the group consisting of (B) other herbicides [herbicides of type (B)] useful in the treatment of an agricultural field with a plurality of crop plants, and optionally together, before or after the application of one or more (C) other active ingredients [active ingredients of type (C)] useful in the treatment of an agricultural field with a plurality of crop plants. 3.Use according to claim 2, characterized in that the herbicides (B) are selected from the group consisting of diflufenican, glufosinate, glyphosate, paraquat, diquat, aclonifen, oxadiazone, oxadiargil, pyraflufen, pyraflufen-ethyl, flufenacet, indaziflam, pyroxasulfone, rimsulfuron, acetochlor, dimethanamide, petoxamide, isoxabene, diclobenylfluridon, flurochloridon, flurtamone, fluometuron, saflufenacil, triflumioxazine, oxyflurophen, SYN-523 as [[3-[2-chloro-5-[3,6-dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1 (2H) -pyrimidinyl]-4-fluorphenoxy]-2-pyridinyl]oxy]-ethyl ester of acetic acid, etofumesate, phenmedifam, dicamba, 2,4-D, tembotrione, mesotrione, as well as esters and salts of these compounds. 4.Use according to claim 2 or 3, characterized in that the active ingredients (C) are selected from the group consisting of insecticides, acaricides, fungicides, protectants, fertilizers, and / or growth regulators or nutrients useful for treating multiple crop plants against phytopathogenic diseases or for regulating or promoting the growth of multiple crop plants in the agricultural field.

5. Use according to any one of claims 1 to 4, characterized by the application, by means of a spot treatment against weeds, of a compound of formula (Ia) or a salt thereof in the agricultural field before or after weed emergence. 6.Use according to any of claims 1 to 5, characterized by the application of a spot weed treatment of a compound of formula (Ia) or a salt thereof in the agricultural field, wherein the spot treatment is carried out with a hooded sprayer and / or a sprayer with a drift-reducing nozzle.

7. Use according to any of claims 1 to 6, characterized by the application of a spot weed treatment of a compound of formula (Ia) or a salt thereof in the agricultural field, wherein the spot treatment is carried out with a precision agriculture vehicle. 8.Use according to any one of claims 1 to 7, characterized by the application of a spot weed control treatment of a compound of formula (Ia) or a salt thereof in the agricultural field, wherein the application of the compound of formula (Ia) or a salt thereof to the foliage of the plurality of crop plants in the agricultural field is avoided.

9. Use according to any one of claims 1 to 8, characterized by a spot weed control treatment application of 0.01 to 2000 g of compound of formula (Ia) or a salt thereof per hectare in the agricultural field where a plurality of crop plants are growing, have been sown, have been transplanted, are to be sown and / or are to be transplanted. 10.A localized spraying method for weed control in an agricultural field where a plurality of crop plants are growing, have been sown, or are to be sown, characterized by the localized spraying of (A) one or more compounds of formula (Ia) or a salt thereof [type (A) herbicides], optionally together, before or after the application of one or more active ingredients selected from the group consisting of (B) other herbicides [type (B) herbicides] useful in the treatment of an agricultural field with a plurality of crop plants, and optionally together, before or after the application of one or more (C) other active ingredients [type (C) active ingredients] useful in the treatment of an agricultural field with a plurality of crop plants.