RU2337548C1 - Herbicidal compound and weed control method - Google Patents

Abstract

FIELD: agriculture.

SUBSTANCE: a herbicidal compound containing as the active substance a mixture of salts of the 2-methoxy-3,6-dichlorobenzoic acid (dicamba) (I) and herbicides from the row of substituted sulfonylureas selected from among chlorsulfuron (IIa) or tribenuron methyl (IIb) and metsulfuron methyl (III) at a ratio of I:(IIa or IIb): III, equal to (15- 20):(1-3):(0.5-2.0) according to the acid equivalent, is described. The compound also contains surfactants and filling materials. A synergic effect is observed. The formulations are wettable powders and water-dispersible granules.

EFFECT: compound is effective against wide spectrum of weeds in agricultural crops.

5 cl, 8 tbl, 6 ex

Description

The invention relates to chemical plant protection products intended for the destruction of weeds in crops of crops, specifically to a herbicidal composition containing, as active substance, a mixture of salts of 2-methoxy-3,6-dichlorobenzoic acid (dicamba) with a substituted sulfonylurea derivative.

Known herbicidal compositions containing, as active substances, mixtures of dicamba ammonium salts and substituted sulfonylureas taken in synergistically effective amounts in the form of water-glycol or aqueous solutions (US Pat. RF No. 2040179, No. 2106782, No. 2236134).

Known herbicidal composition based on C ₇ -C ₉ alkyl esters of 2-methoxy-3,6-dichlorobenzoic acid and substituted sulfonylureas in the form of a suspension concentrate (US Pat. RF No. 2171578).

The disadvantage of these compositions is the low chemical stability of substituted sulfonylureas in the aquatic environment or the instability of formulations during storage, which ultimately leads to a decrease in the herbicidal activity of the preparations. The problems associated with the chemical instability of substituted sulfonylureas can be solved using the final form of the herbicidal composition, including separately packaged compositions of dry (sulfonylureas) and liquid (dicamba) components that are mixed immediately before application of the herbicidal composition (US Pat. RF No. 2277775, Pesticide Handbook and agrochemicals approved for use on the territory of the Russian Federation, Agrorus Publishing House, 2006, p.197-198).

The RF patent No. 2290810 describes a herbicidal composition comprising, as an active ingredient, a mixture of 2-methoxy-3,6-dichlorobenzoic acid and substituted sulfonylurea in the form of a water-soluble powder. This drug is also not stable during storage and cannot be used as a commodity form due to the inevitable caking of the charge.

In RF patent No. 2290811 a herbicidal composition based on 2-methoxy-3,6-dichlorobenzoic acid or its esters and substituted sulfonylureas in the form of an emulsifiable concentrate is described. The disadvantage of this form is the use of an organic solvent, which represents an additional environmental burden on the soil and plants when using the drug. Information on chemical stability during prolonged storage in the description of the invention is also missing.

In the patent of Russian Federation No. 2296467 a herbicidal composition based on 2-methoxy-3,6-dichlorobenzoic acid esters and substituted sulfonylureas in the form of a wort-emulsion concentrate is described.

The closest analogue is the drug Dicameron Grand, registered in the Russian Federation in the period after July 1, 2006, until April 28, 2007, containing, as the active substance, a mixture of dicamba salts (659 g / kg) and chlorosulfuron (41 g / kg) by acid equivalent . Ammonium or sodium salts are used as dicamba salts, and the sodium salt is used as the chlorosulfuron salt. The drug is released in the form of water-dispersible granules (EDC). This form ensures the stability of the drug and increases its shelf life. The drug is used to combat annual dicotyledonous and some perennial dicotyledonous weeds in crops of grain crops. The consumption rate for the preparation is 120-135 g / ha, for the active substance 84-95 g / ha. See 1) the information on the AgroChemPovolzhie website (agroxp.ru) dated January 19, 2007; 2) "Protection and Quarantine of Plants" No. 6, 2007, p. 59; 3) List of pesticides and agrochemicals approved for use on the territory of the Russian Federation, 2007, p. 179.

The object of the present invention is a new herbicidal composition containing as an active substance a mixture of three components:

I - salt of 2-methoxy-3,6-dichlorobenzoic acid (dicamba),

II - chlorosulfuron (IIa) or tribenuron-methyl (IIb), or their salts,

III - Metsulfuron-methyl or its salts.

The ratio of components I: (IIa or IIb): III is (15-20) :( 1-3) :( 0.5-2.0) in acid equivalents. With the combined action of these herbicides within the specified ratios, a synergistic effect is observed.

соли.As salts of 2-methoxy-3,6-dichlorobenzoic acid, potassium, sodium and ammonium are used in this composition

salt.

As salts of substituted sulfonylureas - chlorosulfuron, tribenuron-methyl and metsulfuron-methyl, their potassium, sodium, dimethylethanolammonium, diethylethanolammonium, monoethanolammonium and triethanolammonium salts are used.

Suitable formulations for the new herbicidal composition are wettable powders or water-dispersible granules.

Wettable powders are uniformly dispersible in water preparations, which along with the active substances contain a filler, usually an inert substance and a surfactant (dispersant and wetting agent). From prepared mixtures of active substances with fillers, dispersants, wetting agents and other auxiliary substances, granules are prepared using a variety of known granulation methods, including in a fluidized bed by spraying water onto a weighed charge layer. As fillers in the new herbicidal composition, white soot and aerosil having high absorption capacity are used.

The herbicidal composition in the form of a wettable powder or water-dispersible granules contains components in the following amounts, wt.%.

2-methoxy-3,6-dichlorobenzoic acid salt (acid equivalent) 45.0-63.0 Chlorosulfuron or tribenuron-methyl or their salts (acid equivalent) 2.5-10.8 Metsulfuron-methyl or its salts (acid equivalent) 1.4-7.6 Surfactants 10-17 Filler the rest is up to 100

The following are the characteristics of the surfactants and fillers used in the new herbicidal composition.

Surfactants and Excipients Morvet D-425 The condensation product of the sodium salt of sulfonated naphthalene and formaldehyde is a dispersant. Lignosulfonates, powdered. A mixture of sodium salts of lignosulfonic acids. Dispersant (TU 13-02810036-15-90) SV-102 Sodium bis- (2-ethylhexyl) succinate-sulfonate is a wetting agent (TU 6-14-935-80).

Neonol AF 9-12 Oxyethylated Nonylphenol C ₉ H ₁₉ C ₆ H ₄ O (C ₂ H ₄ O) _n H, n = 9-12 (TU 2483-077-5766801-98). Sintanol BV A mixture of ethoxylated fatty alcohols C _n H _{2n + 1} O (C ₂ H ₄ O) _m H, n = 10-18, m = 7-12 (TU 6-36-5744684-85-90). Betapav A Alkylcarboxybetaines (Alk-C ₈ -C ₁₂ ), TU 2482-00204706205-2004). Iwadet Composition based on polyethylene glycol esters of monoalkylphenols with a degree of hydroxyethylation from 6 to 10 and disodium salts of monoesters of sulfosuccinic acid based on monoalkylamides of coconut oil fatty acids (TU 2484-171-05744685-99). White soot Fine silica SiO ₂ · H ₂ O (GOST 18307-78) grade 100 or 120. Kaolin Natural aluminosilicate Al ₂ О ₃ · 2SiO ₂ · Н ₂ О with impurities of quartz, mica and spar. Aerosil Pure silicon dioxide SiO ₂ (GOST 14922-77).

The herbicidal compositions in accordance with the present invention are stable during storage and transportation, when diluted with water, they form stable suspensions and retain herbicidal activity for a long time, including at high and low ambient temperatures.

New herbicidal compositions have a wider spectrum of action, that is, they suppress a larger assortment of weeds compared to the prototype while reducing the rate of application of each component of the mixture separately.

Herbicidal compositions in accordance with the present invention suppress or destroy, depending on the rate of consumption and the degree of sensitivity of the plants, such weeds in crops of crops such as southern akalifa, ragweed, ragweed, chandra crest, thrown backworm, mint, amaranth, white gauze, bedstraw, sow thistle yellow, sow thistle pink (Cirsium arvensis), codweed, morning glory, mountaineer potato, sisezbekia fluffy, mustard, nightshade, asterisk, veronica, violet, gingham, field bindweed, sorrel, wormwood, chickweed, Ortiz and other field.

Another object of the invention is a method of controlling weeds in crops of crops, preferably cereals, comprising a herbicidal composition containing, as an active ingredient, a synergistically effective mixture of salts of dicamba I, chlorosulfuron IIa or tribenuron-methyl IIb and metsulfuron-methyl III and / or their salts are applied in effective amounts to weeds to be suppressed or destroyed or their habitat.

Example 1. Obtaining wettable powder (SP) composition GS-9.

1.1. 187.8 g of white carbon black and kaolin (9: 1 ratio) were loaded into a batch mixer and Morvet D-425 dispersant in an amount of 60 g and surfactants — a wetting agent SV-102 and syntanol BV — were fed with a nozzle using a nozzle the amount of 45 g each. After the filing of the surfactant, the mixture No. 1 was mixed for 15 minutes.

1.2. 603 g of dicamba ammonium salt, 39.7 g of chlorosulfuron triethanolammonium salt and 19.5 g of methanesulfuron-methyl triethanolammonium salt and 337.8 g of charge No. 1 were successively charged into the mixer.

The components were mixed for 10-15 minutes. Then served on the grinding mill. After grinding, the mixture was averaged in the mixer for 5-10 minutes.

Other compositions of the powder mixtures presented in table 1, obtained in a similar way.

Example 2. Obtaining water-dispersible granules (VDL composition GS-5.

149.3 g of carbon black filler, 60 g of Morvet D-425 dispersant were loaded into a high-speed mixer with a two-blade mixer, and 90 g of a wetting agent SV-102 were added with the mixer working. After the filing of the wetting agent, the mixture was mixed for 4-5 minutes (charge No. 1).

635 g of dicamba potassium salt, 33 g of chlorosulfuron dimethylethanolamine salt and 32.7 g of metsulfuron-methyl dimethylethanolamine salt (charge No. 2) were successively added to charge No. 1.

The mixture No. 2 was mixed in the same mixer for 5 minutes, unloaded and grinded in a pin mill. The milled charge No. 2 was loaded into the Aeromatic A9 apparatus and granulated in a vortex layer by spraying water (10-12% of the weight of the mixture) onto a suspended layer of the mixture No. 2. Water was sprayed using a pneumatic nozzle. The granules formed were dried in the same apparatus at an inlet air temperature of 80-85 ° C and an output of 43-46 ° C. The dried product (humidity 2-3%) was dispersed in a zigzag separator.

The yield of the target fraction is ~ 75%.

Retur particles of the finished product with a size of less than 0.2 mm and more than 1.0 mm (after grinding) were returned to re-granulation.

Other formulations shown in table 1, obtained in a similar manner.

Example 3. Herbicidal activity of the compounds in the growing experiments.

Biological tests of herbicidal compositions, the compositions of which are shown in table 1, were carried out in a laboratory chamber of an artificial climate (VCI) on test plants of a cocklebur (Xanthium sibiricum Patrin ex Wilid).

The test plant, the fruit bush, was grown in vegetation experiments in paper waxed cups with a diameter of 100 mm and a capacity of 600 cm ³ filled with a mixture of sod-podzolic soil, sand and peat in a weight ratio of 1: 1: 1.

When growing test plants and conducting an experiment in a climate chamber, a controlled mode was maintained: illumination of 20 thousand lux for 16 hours (day), without illumination 8 hours a day (night), air temperature 25 ° C during the day and 20 ° C at night, relative humidity of 70%, soil moisture 60% of PV, supported by daily normalized irrigation by weight of vegetation vessels.

After careful rejection of plants by height and phase of development, 2 plants were left in each vessel.

Herbicidal compositions and reference samples were applied to the phase of 2 real leaves of the fruit bush using a laboratory sprayer developed by VNIIF (Chemistry in Agricultural Science, 1985, No. 7). The flow rate of the working fluid is 400 l / ha, the average droplet size is ~ 180 microns. The repetition of vegetation experiments is fivefold.

The effectiveness of the herbicidal compositions was evaluated 14 days after treatment in comparison with the untreated control by the difference in the wet weight of the aerial parts of plants.

Indicators of the herbicidal activity of the compositions based on derivatives of dicamba, chlorosulfuron and metsulfuron methyl; dicamba, tribenuron-methyl and metsulfuron-methyl, as well as standards - compositions based on dicamba and chlorosulfuron or tribenuron-methyl without metsulfuron-methyl and separately individual metsulfuron-methyl - are shown in tables 2 and 3.

The synergistic effect is calculated by the formula: E = E _e -E _o ,

where E is the synergistic effect of the compositions;

E _e - the percentage of death of weeds from the composition, experiment;

E _o - the expected percentage of death of weeds.

The expected percentage of weed deaths was calculated using the Colby formula (Colby J.R., Weeds, 1967, v.15, No. 1, pp.20-22):

,

,

where X is the percentage of death of weeds from the composition without Metsulfuron methyl;

Y is the percentage of death of weeds from Metsulfuron methyl.

Example 4. The effect of herbicidal compositions on the species sensitivity of weeds in the field.

Field plot experiments were carried out in the Moscow region in the spring wheat cultivars of the Enita variety.

The weed cenosis was dominated by fragrant chamomile, white gauze, field torus, chickweed picnic, field sow thistle, field calf, middle asterisk.

Herbicidal compositions and standards were applied in the form of an aqueous suspension to the tillering phase of the culture using an OD-2 experimental sprayer designed by VNIIF (Bulletin of the Russian Academy of Agricultural Sciences, 1993, No. 3). The rate of consumption of an aqueous suspension of 200 l / ha.

The plot area is 20.0 m ² , 4-fold repetition, the allocation of plots is randomized.

Soil: sod-podzolic with a humus content of 2.5%, _water pH = 5.3.

Agrotechnics: the predecessor is black steam, agrotechnical techniques generally accepted for the Moscow region.

Accounting for weeds in the experimental and control plots was carried out before spraying and 30 days after the herbicidal treatment. Accounting areas of 0.1 m ² in the amount of three are located on the diagonal of each plot in 4 replicates of all options.

The test results are presented in tables 4 and 5.

The synergistic effect for each type of prevailing weed is calculated by the Colby formula.

Example 5. Testing the biological and economic efficiency of the application of herbicidal compositions in the field.

Field experiments were carried out in the conditions of the Moscow region in crops of barley cultivar Moskovsky 2.

The weevil cenosis was dominated by medium-sized asterisk, odorless chamomile, shepherd’s bag, white gauze, field torus, annual bluegrass, field violet, field sow thistle, purpurea purpurea, species of pikulnik.

The herbicidal compositions and the standard (prototype for them) were applied in the form of aqueous suspensions in the tillering phase of the culture using the experimental sprayer OD-2 design VNIIF.

The consumption rate of herbicidal compositions based on the combination of dicamba + chloro-sulfuron + metsulfuron-methyl: GS-7, SP; GS-2, VDG; GS-5, VDG in terms of the amount of active substances per acid equivalent (ke) amounted to 58.4 and 72.6 g / ha, respectively, of the prototype 84.0 g / ha.

The rate of flow of the working fluid with water as a carrier is 200 l / ha.

The consumption rate of herbicidal compositions based on the combination of dicamba + tribenuron-methyl + metsulfuron-methyl: GS-19, SP; GS-14, VDG; GS-12, VDG by the amount of active substances per ke amounted to 54.4 and 65.3 g / ha, respectively, of the prototype 84 g / ha.

The rate of flow of the working fluid with water as a carrier is 200 l / ha.

The cultivated area of one plot is 20 m ² , accounting 12.5 m ² , 4-fold repetition.

Weeds were counted three times: before spraying, 30 days after the herbicidal treatment and before harvesting. Accounting areas of 0.1 m ² in the amount of three are located on the diagonal of each plot in 4 replicates of all options.

Harvest accounting was carried out using a small-sized combine "Hehe-125" with the accounting area of the plot.

Weather conditions for conducting the experiment were favorable for the growth and development of the culture and the action of herbicides on weeds.

Statistical processing was performed by analysis of variance at a 5% confidence level.

The test results are presented in tables 6 and 7.

As can be seen from the presented results, the processing of barley crops with herbicidal compositions in accordance with the invention not only reduces weediness, but also leads to a significant increase in the yield of this crop compared to the reference prototype.

Example 6. Evaluation of the stability of herbicidal compositions by the method of accelerated storage.

Samples of preparations weighing 100 g were placed in plastic bags and sealed. Plastic bags with samples were placed in a thermostat for 90 days. During the storage of samples, the temperature in the thermostat was kept constant at 30 ± 0.1 ° С.

The percentage decomposition of active substances in herbicidal compositions was calculated by the formula:

,

,

where X is the relative percentage of decomposition,%;

Y ₁ - mass fraction of the substance in the sample before storage,%;

Y ₂ - mass fraction of the substance in the sample after storage,%.

The stability assessment results are shown in table 8.

table 2 Herbicidal activity of compositions based on derivatives of dicamba, chlorosulfuron, metsulfuron-methyl in the treatment of vegetative plants of fruit grass (vegetative experience in VCI) Cipher herbicide composition The ratio of active substances to ke Dose, g / ha (acid equivalent, ke) The decrease in the green mass of the cocklebur,% of control Synergetic effect (+),% Active substances dicamba Chlorosulfuron ∑ D.V. dicamba + chlorosulfuron metsulfuron methyl GS-1, VDG 15: 1: 0.5 eighteen 1,2 19.2 0.6 48 + 12.4 GS-2, VDG 15: 1: 1.0 eighteen 1,2 19.2 1,2 54 +13.5 GS-3, VDG 15: 1: 2.0 eighteen 1,2 19.2 2,4 65 +11.2 GS-4, VDG 20: 1: 0.5 24 1,2 25,2 0.6 51 +13.6 GS-5, VDG 20: 1: 1.0 24 1,2 25,2 1,2 56 +13.8 GS-6, VDG 20: 1: 2.0 24 1,2 25,2 2,4 67 +11.9 GS-7, SP 15: 1: 1.0 eighteen 1,2 19.2 1,2 52 +11.5 GS-8, SP 15: 1: 2.0 eighteen 1,2 19.2 2,4 65 +11.2 GS-9, SP 20: 1: 0.5 24 1,2 25,2 0.6 51 +13.6 GS-10, SP 20: 1: 2.0 24 1,2 25,2 2,4 68 + 12.9 Standards dicamba + chlorosulfuron 15: 1 eighteen 1,2 19.2 - thirty - 20: 1 24 1,2 25,2 - 32 - Metsulfuron methyl - - - - 0.6 8 - - - - - 1,2 fifteen - - - - - 2,4 34 -

Table 3 Herbicidal activity of compositions based on derivatives of dicamba, tribenuron-methyl, metsulfuron-methyl in the treatment of vegetative plants of fruit-bush (vegetative experience in VCI) Cipher herbicide composition The ratio of active substances to ke Dose, g / ha (acid equivalent, ke) The decrease in the green mass of the cocklebur,% of control Synergetic effect (+),% Active substances dicamba tribenuron methyl ∑ D.V. dicamba + tribenuron methyl metsulfuron methyl GS-11, VDG 15: 1: 1 eighteen 1,2 19.2 1,2 46 10.6 GS-12, VDG 15: 2: 1 eighteen 2,4 20,4 1,2 52 11.5 GS-13, VDG 15: 3: 1 eighteen 3.6 21.6 1,2 59 11.7 GS-14, VDG 20: 1: 1 24 1,2 25,2 1,2 fifty 11,2 GS-15, VDG 20: 2: 1 24 2,4 26,4 1,2 60 12.7 GS-16, VDG 20: 3: 1 24 3.6 27.6 1,2 70 10.8 GS-17, SP 15: 1: 1 21 1.4 22.4 1.4 52 eleven GS-18, SP 15: 3: 1 21 5.9 26.9 1.4 74 10.1 GS-19, SP 20: 1: 1 24 1,2 25,2 1,2 48 9.2 GS-20, SP 20: 3: 1 24 3.6 27.6 1,2 70 10.8 Standards dicamba + tribenuron methyl 15: 1 eighteen 1,2 19.2 - 24 - also 21 1.4 22.4 - 28 - 15: 2 eighteen 2,4 20,4 - thirty - 15: 3 eighteen 3.6 21.6 - 38 - also 21 5.9 26.9 - 56 - 20: 1 24 1,2 25,2 - 28 - 20: 2 24 2,4 26,4 - 38 - 20: 3 24 3.6 27.6 - 52 - metsulfuron methyl - - - - 1,2 fifteen - - - - - 1.4 eighteen -

Table 4 The effect of herbicidal compositions based on dicamba, chlorosulfuron and metsulfuron methyl on the species sensitivity of weeds in spring wheat crops 30 days after treatment in the tillering phase Weed species Decrease in weediness by options,% of control The number of weeds in the control, pcs / m ² The synergistic effect of the composition (+),% Songs Standards GS-7, SP GS-2, VDG GS-5, VDG GS-7, joint venture without MSM * GS-2, EDC without MSM * GS-5, EDC without MSM * Laren, SP (600 g / kg MSM *) (Doses for acid equivalents, g / ha) GS-7, SP GS-2, VDG GS-5, VDG (51) (51) (59.4) (48) (48) (56.7) (2.7) (3) Cirsium field 87 85 84 62 60 59 34 35 12 11.7 11.0 11.0 Asterisk medium 96 95 92 76 74 69 39 40 28 10,4 10.6 10.9 Mary White 98 95 96 72 74 70 48 48 21 12.6 12.5 11.6 Sow Thistle 86 88 86 60 64 65 34 34 eighteen 12,4 11.8 9.1 Pikulnik Zyabra 98 96 94 78 76 74 40 42 fifteen 10.8 9.9 9.6 Fragrant chamomile 91 92 90 68 70 67 37 38 54 10.9 10.6 10.8 Toritsa field 88 90 92 60 65 62 42 44 16 10,4 9.6 14.0 * MSM - Metsulfuron-methyl

Table 5 The effect of herbicidal compositions based on dicamba, tribenuron methyl and metsulfuron methyl on the species sensitivity of weeds in spring wheat crops 30 days after treatment in the tillering phase Weed species Decrease in weediness by options,% of control The number of weeds in the control, pcs / m ² The synergistic effect of the composition (+),% Songs Standards GS-19,
Joint venture GS-14, VDG GS-12, VDG GS-19, joint venture without MSM * GS-14, VDG without MSM * GS-12, VDG without MSM * Laren, SP (600 g / kg MSM *) (Doses for acid equivalents, g / ha) GS-19, SP GS-14, VDG GS-12, VDG (66) (66) (54) (63) (63) (51) (3) Cirsium field 80 84 80 54 58 55 32 10 11.3 12.6 10.6 Asterisk medium 90 92 90 70 72 68 38 24 8.6 9,4 9.8 Mary White 92 94 90 66 68 62 44 fifteen 11.0 11.9 11.3 Sow Thistle 85 84 82 60 58 56 32 16 12,2 12.6 11.9 Pikulnik Zyabra 92 94 94 68 70 72 40 fourteen 11,2 12.0 10.8 Fragrant chamomile 85 87 86 58 60 64 36 49 11.9 12.6 11.0 Toritsa field 84 86 85 54 58 56 42 12 10.7 10,4 10.5 * MSM - Metsulfuron-methyl

Table 6 The effect of herbicidal compositions based on dicamba, chlorosulfuron and metsulfuron methyl on the total weediness and yield of barley grain Option The dose of active substances according to ke, g / ha Decrease in weediness,% Grain harvest, kg / ha 30 days after treatment before harvesting Total protected crop GS-7, SP 58.4 92 94 18.9 6.1 72.6 96 98 19.8 7.0 GS-2, VDG 58.4 89 95 18.8 5.9 72.6 98 98 19.6 6.8 GS-5, VDG 58.4 90 96 19.3 6.5 72.6 97 99 20,0 7.2 Prototype, EDC 84.0 86 88 17,2 4.4 Hand weeding - one hundred one hundred 18.3 5.5 Herbicide-free control - (245) * (820) ** 12.8 - NDS ₀₅ - - - 2.1 - * Number of weeds, pcs / m ² ** Mass of weeds, g / m ²

Table 7 The effect of herbicidal compositions based on dicamba, tribenuron-methyl and metsulfuron-methyl on the total weediness and yield of barley grain Option The dose of active substances according to ke, g / ha Decrease in weediness,% Grain harvest, kg / ha 30 days after treatment before harvesting Total protected crop GS-19, SP 54,4 80 95 18.6 5,4 65.3 84 99 19.7 6.5  GS-14, VDG 54,4 78 96 19.0 5.8 65.3 86 99 20,0 6.8 GS-12, VDG 54,4 76 95 19.2 6.0 65.3 84 98 19.6 6.4 Prototype, EDC 84.0 80 83 17.3 4.1 Hand weeding - one hundred one hundred 18.0 4.8 Herbicide-free control - (220) * (890) ** 13,2 - NDS ₀₅ - - - 1.9 - * Number of weeds, pcs / m ² ** Mass of weeds, g / m ²

Table 8 Stability of herbicidal compositions under conditions of accelerated storage (t = 30 ° C, time 90 days) Code of composition Mass fraction of active substances by ke, wt.% Before storage After storage dicamba chlorosulfuron tribenuron methyl metsulfuron methyl dicamba chlorosulfuron tribenuron methyl metsulfuron methyl GS-7, SP 57.0 3.8 - 3.8 56.9 * 3.78 * - 3.82 * GS-2, VDG 60.0 4.0 - 4.0 60.1 * 4.02 * - 3.98 * GS-10, SP 50,0 2,5 - 5,0 50.0 * 2.48 * - 5.0 * GS-19, SP 60.0 - 3.0 3.0 60.0 * - 2.98 * 3.01 * GS-14, VDG 60.0 3.0 3.0 59.9 * - 3.01 * 2.95 * GS-12, VDG 63.0 - 8.4 4.2 63.0 * - 8.35 * 4.2 * Prototype 66.0 4.0 - - 66.0 * 3.9 ** - - The determination method is high pressure liquid chromatography. The accuracy of determination: dicamba P ₉₅ = ± 0.6%, chlorosulfuron, metsulfuron-methyl and tribenuron-methyl - P ₉₅ = ± 0.09%. * decomposition does not occur, ** degree of decomposition 2.5 rel.%.

Claims (5)

1. A herbicidal composition containing as an active substance a mixture of salts of 2-methoxy-3,6-dichlorobenzoic acid (dicamba) (I) and a herbicide from a number of substituted sulfonylureas (II) along with surfactants and fillers, characterized in that chlorosulfuron (IIa) or tribenuron-methyl (IIb) in combination with metsulfuron-methyl (III) and / or its salts are used as substituted sulfonylureas in the ratio 1: (IIa or IIb): III, respectively (15-20): (1-3) :( 0.5-2.0) in acid equivalents, with salts of 2-methoxy-3,6-dichlorobenzoin acid (I) are represented by potassium or sodium or ammonium salts, and the salts of chlorosulfuron (IIa), tribenuron-methyl (IIb) and metsulfuron-methyl (III) are potassium or sodium, or dimethylethanolammonium, or diethylethanolammonium, or monoethanolammonium salts, in the following ratio of components, wt.%: 2-methoxy-3,6-dichlorobenzoic acid salt acid equivalent (ke) 45.0-63.0 Chlorosulfuron or Tribenuron-Methyl or their salts according to ke  2.5-10.8 Metsulfuron-methyl or its salts according to ke 1.4-7.6 Surfactants 10-17 Filler The rest is up to 100 2. The herbicidal composition according to claim 1, wherein the surfactants are selected from the group consisting of fused sodium alkylnaphthalene sulfonates, sodium lignosulfonate, sodium bis (2-ethylhexyl) succinate sulfonate, ethoxylated nonylphenols, ethoxylated fatty alcohols, alkylcarboxybenols, , disodium salts of sulfonosuccinic acid monoesters, coconut oil fatty acid monoalkylamides and / or mixtures thereof. 3. The herbicidal composition according to claim 1, in which the fillers are aerosil or white soot, or kaolin, or mixtures thereof. 4. The herbicidal composition according to claim 1, characterized in that it is presented in the form of a wettable powder or water-dispersible granules. 5. A method of controlling weeds in crops of cereal crops by applying herbicides based on a mixture of dicamba with substituted sulfonylureas, characterized in that an effective amount of the herbicidal composition according to any one of claims 1 to 4 is applied to the weeds to be destroyed.