RU2767999C1 - Liquid herbicide composition - Google Patents

Abstract

FIELD: agriculture.

SUBSTANCE: invention relates to agriculture, and more specifically to liquid herbicidal compositions. The liquid herbicidal composition in the form of an oily suspension concentrate contains the active substances thifensulfuron-methyl, tribenuron-methyl and flumetsulam, a dispersant, emulsifiers, rheology modifiers, a stabilizer of active substances, selected from a number of acidic and medium salts of alkali and alkaline earth metals of phosphoric, carbonic pyrophosphoric and ammonium phosphate and organic solvents, with the following component ratios (wt.%): tribenuron-methyl 1-20, thifensulfuron-methyl 1-10, flumetsulam 1-10, dispersant 1-10, emulsifiers 4-20, stabilizer of active ingredients 0, 5-2.0, rheology modifiers 1-5, solvents - the rest.

EFFECT: proposed liquid herbicidal composition in the form of an oil suspension concentrate provides a reduction in the total weediness of crops, effective control of broad-leaved weeds on wheat and barley crops, is stable and allows minimizing the loss of thifensulfuron-methyl, tribenuron-methyl and flumetsulam during storage.

1 cl, 3 tbl

Description

The invention relates to herbicides, and more specifically to liquid herbicidal compositions based on three active ingredients - tribenuron-methyl, thifensulfuron-methyl and flumetsulam. This herbicidal composition is aimed at combating broad-leaved weeds (Theophrastus ropeweed, upturned amaranth, ragweed, drooping quinoa, tenacious bedstraw, shepherd's purse, black nightshade, knotweed, field mustard, pikulnik, wild radish, etc.) on wheat and barley crops.

Tribenuron-methyl, thifensulfuron-methyl and flumetsulam have a similar mechanism of action on harmful organisms, penetrating into the plant, they cause inhibition of acetolactate synthase and block the biosynthesis of valine, leucine and isoleucine, which leads to the cessation of cell division and plant growth. Weeds that are more resistant to sulfonylurea do not die, but stop growing. Cereals are resistant to sulfonylurea derivatives.

A number of systemic highly selective herbicides for weed control and protection of crops are known, containing thifensulfuron-methyl and tribenuron-methyl as active ingredients: Granstar Mega - 250 g/kg tifensulfuron-methyl and 500 g/kg tribenuron-methyl, Caliber (Duo) Gold - 375 g / kg of tifensulfuron-methyl and tribenuron-methyl, Caliber - 500 g / kg of tifensulfuron-methyl and 250 g / kg of tribenuron-methylav, Express Gold - 187.5 g / kg of tifensulfuron-methyl and 562.5 g /kg tribenuron-methyl.

Known herbicidal composition for the treatment of crops in the form of water-soluble granules containing active compounds from the sulfonylurea series - tifensulfuron-methyl and tribenuron-methyl, auxiliary components - anhydrous sodium sulfate, sodium lignosulfonate, sodium carboxymethyl starch, hydrated silica gel, sodium carboxymethylcellulose and calcium carbonate (patent UA 82140, IPC A01N 47/36, A01N 25/08, A01N 25/12, A01N 25/14, published 07/25/2013).

However, all of these preparations contain only thifensulfuron-methyl and tribenuron-methyl and exist only in the form of dry fluid suspensions and water-dispersible granules, which is a significant drawback. When using these preparative forms in the preparation of working mixtures, there is a risk of inhalation poisoning of workers, as well as thorough and constant mechanical mixing in the sprayer tank is required due to the drug settling. In addition, dry formulations are inferior in biological effectiveness to innovative formulations such as oil dispersions.

A combination of 24 g/l of flumetsulam with 90 g/l of thifensulfuron-methyl and 18 g/l of florasulam in the form of an oil dispersion in the herbicide preparation Pixel is known (Pixel, MD. Pesticides. ru [electronic resource] // Access mode: https:/ /www.pesticidy.ru/pesticide/%D0%9F%D0%B8%D0%BA%D1%81%Р0%B5%D0%BB%D1%8С (accessed 25.06.2021)).

Known three-component herbicide Status Max for the protection of crops from a complex of dicotyledonous weeds with a cross-spectrum containing 500 g/kg tifensulfuron-methyl, 250 g/kg tribenuron-methyl and 80 g/kg florasulam. The herbicide is produced in the form of water-dispersible granules intended for dissolution in water to form a homogeneous suspension with a working fluid flow rate of 200-300 l/ha (Status Max, VDG. Pesticides. ru [electronic resource] // Access mode: https:/ /www.pesticidy.ru/pesticide/status-maks (accessed 06/25/2021)).

The disadvantage of the drug is its preparative form - in the form of water-dispersible granules, which creates the risk of inhalation poisoning of those working in the preparation of working mixtures, and also requires thorough and constant mechanical mixing in the sprayer tank due to drug settling.

The closest is a liquid preparation in the form of an oily suspension concentrate or an aqueous spray liquid obtained from it, which contains tifensulfuron and tribenuron selected from the group of sulfonylureas and their salt and esters (0.1-30 wt.%), one or more protective substances from the group consisting of mefenpyr, isoxadifen, cloquintocet, fenchlorazole and their salt and esters (2-40 wt.%), one or more preferably organic solvents (20-80 wt.%) and one or more sulfosuccinates (0.5- 30 wt.%. Additionally, the preparation may contain one or more agrochemical biologically active substances, conventional excipients and additives - dispersing agents, emulsifiers (0-28 wt.%) and a rheology modifier (0-3 wt.%) (patent EA 12521, IPC A01N 47 / 36, A01N 43/80, A01N 43/653, A01N 43/56, A01N 43/42, published 10/30/2009).

However, the above compositions do not contain the required combination of active ingredients. In addition, the composition is not intended for storage, since over time, the destruction of the active substances occurs, which in turn negatively affects the effectiveness of the proposed composition, which will quickly decline.

The objective of the invention is to develop a composition of a liquid herbicidal composition based on thifensulfuron-methyl, tribenuron-methyl and flumetsulam.

The technical result is a reduction in the total weediness of crops and an increase in the stability of a liquid herbicidal composition containing thifensulfuron-methyl, tribenuron-methyl and flumetsulam.

The technical result is achieved in a liquid herbicidal composition in the form of an oil suspension concentrate containing the active ingredients thifensulfuron-methyl and tribenuron-methyl, a dispersant, emulsifiers, rheology modifiers and organic solvents, additionally containing flumetsulam and a stabilizer of active ingredients selected from a number of acidic and medium alkaline salts and alkaline earth metals of phosphoric, pyrophosphoric and carbonic acids and ammonium phosphate, at the following ratios of components, wt.%:

tribenuron-methyl 1-20 thifensulfuron-methyl 1-10 flumetsulam 1-10 dispersant 1-10 emulsifiers 4-20 active ingredient stabilizer 0.5-2.0 rheology modifiers 1-5 solvents rest

Tifensulfuron-methyl and tribenuron-methyl, belonging to the sulfonylurea class, have chemical instability associated with hydrolysis through cleavage in the sulfonylurea bridge, which creates problems during storage of liquid formulations and ready-made solutions containing these substances, and also reduces the time of action of the applied drug, due to the formation of active substances as a result of the decomposition of inactive forms. Flumetsulam, belonging to the class of triazolpyrimidines, is not hydrolyzed, but the photolysis to which it undergoes is faster under natural conditions.

The essence of the invention lies in the development of a composition of a liquid herbicidal composition based on thifensulfuron-methyl, tribenuron-methyl and flumetsulam, which provides ease of handling and safety of use due to its formulation with the possibility of long-term storage and preservation of its effectiveness due to the action of stabilizers of active ingredients that increase the stability of the liquid composition . Data confirming the increase in the stability of tribenuron-methyl, thifensulfuron-methyl and flumetsulam under the action of stabilizers are shown in table 1.

The increase in stability was determined by the loss of active ingredients (in wt.% relative to the initial content of tribenuron-methyl, thifensulfuron-methyl and flumetsulam) after 8 weeks of storage of the liquid composition at a temperature of +45°C. The concentration of active substances was evaluated using high performance liquid chromatography.

From the test results obtained, it can be seen that the use of active ingredient stabilizers allows minimizing the loss of thifensulfuron-methyl, tribenuron-methyl and flumetsulam during storage of the liquid herbicidal composition.

Examples of complete formulations of a liquid herbicidal composition using active ingredient stabilizers selected from a range of alkali and alkaline earth salts of phosphoric, pyrophosphoric and carbonic acids are shown in Table 2.

For the preparation of the compositions were used:

Tribenuron-methyl - [2-[6-methyl-4-methoxy-1,3,5-triazin-2-yl (methyl) carbomoylsulfamoyl] benzoic acid methyl ester] - a selective herbicide of the group of sulfonylurea derivatives (CAS No. 101200-48 -0);

Tifensulfuron-methyl - [3-(4-methoxy-6-methyl-1,3,5-triazin 2-ylcarbomoylsulfomoyl) thiophene-2-carboxylic acid methyl ester] - selective herbicide of the group of sulfonylurea derivatives (CAS No. 79277-27- 3);

Flumetsulam [N-2,6-(difluorophenyl)-5-methyl[1,2,4]triazolo[1,5-A]pyrimidine-2-sulfonamide] is a selective herbicide of the triazolpyrimidine class (CAS No. 98967-40-9 );

As dispersants: sodium sulfosuccinate, e.g. Triton GR - 7ME (manufacturer Dow (import)), polymer-derived fatty acids, such as Atlox 4914 or polyester Atlox 4916 (manufacturer Croda Europe Ltd. (import)), non-ionic polyester, e.g. Break Thru DA 646 (manufacturer Evonik Industries AG (import));

As emulsifiers: castor oil ethoxylates, such as Tergitol ESO-36 (manufacturer Dow (import)), ethoxylated sorbitan trioleate, such as Alkamuls T / 85-V (CAS No. 9005-70-3 manufacturer Solvay), proprietary mixtures of anionic and nonionic surface -active substances based on ethoxylated higher fatty acids, such as Tensiofix IW60/EW70 (manufacturer Omni Chemical Industries (import)), linear calcium salt dodecylbenzene sulfonate in 2-ethylhexanol, such as Rhodocal 60/BE (CAS No. 26264-06-2/104 -76-7 manufacturer Solvay), block copolymer of ethylene oxide and propylene oxide, for example Tensiofix DB08 (manufacturer Omni Chemical Industries (import));

As rheology modifiers: stabilizers and rheology modifiers based on silicon dioxide such as Konasil A300, Aerosil A200 (CAS No. 1 12945-52-5), Aerosil R805 and Aerosil R972 (CAS No. 68611-44-9) - (manufacturer Evonik Industries AG (import));

Acid and medium (neutral) salts of alkali and alkaline earth metals of phosphoric, pyrophosphoric and carbonic acids and ammonium phosphate were used as stabilizers of active substances;

The following solvents were used: methyl esters of fatty acids (manufactured by JSC Grodno Azot) or vegetable oil (for example: sunflower oil (manufactured by Rusagro Group of Companies LLC), soybean oil (manufactured by Amuragrocenter LLC), castor oil ( manufacturer LLC "Company ElGroup"), rapeseed oil (manufacturer OAO "Kosulinskoe", LLC "ProFet"), or mineral oil (for example, Netoxol (manufacturer LLC "LLK-International"), or a high-boiling solvent (for example: Solvesso 200 (manufacturer ExxonMobil ).

The assessment of the biological activity of the herbicidal composition was carried out in accordance with the "Guidelines for registration tests of herbicides in agriculture" (Russian Academy of Agricultural Sciences. All-Russian Research Institute of Plant Protection. Edited by V.I. Dolzhenko, St. Petersburg, 2013 , 280 p.) on crops of wheat and barley infested with annual dicotyledonous weeds (ODS), perennial dicotyledonous weeds (MDS) and annual cereal plants: tenacious bedstraw (Galium aparine G.), common shepherd's purse (Capsella bursa-pastoris (L. ) Medik.), field yaruka (Thlaspi arvensis L.), field mustard (Sinapis arvensis L.), wild radish (Raphanus raphanistrum L.), medium chickweed (Stellaria media (L.) Vill.), field bindweed (Convolvulus arvensis L.), white gauze (Chenopodium album L.), bristly calendula (Cirsium setosum (Willd.) Bess.), annual chives (Stachus annua L.), field violet (Viola arvensis Murr.), field calendula (Cirsium arvense ( L.) Scop.), sow thistle left (Sonchus arvensis L.), field snail (Cerastium arvense L.), self-seed poppy (Papaver rhoeas L.), odorless chamomile (Matricaria perforata Merat.), upturned amaranth (Amaranthus retroflexus L.).

The initial number of weeds in the experimental plot averaged 79 ind./m ² . The mixture of weeds was mainly represented by annual and perennial dicotyledonous plants. The results were recorded after a single spraying of vegetative plants at certain time intervals by the quantitative-weight method on accounting plots of 0.25 m ² in each experimental plot, manually.

The effectiveness of the compositions with the declared content (wt.%) of DV in the composition was compared with the effect of the standard (comparison standard) - the registered preparation Status Max, VDG (LLC ZEMLYAKOFF GK) - a highly effective three-component herbicide for protecting grain crops from a complex of dicotyledonous weeds with cross- spectrum with active ingredients - tifensulfuron-methyl 500 g/kg, tribenuron-methyl 250 g/kg, florasulam 80 g/kg (the total content of active ingredients in the composition is 83 wt.%). The yield indicators of the studied crops were statistically processed by the method of dispersion analysis.

The results of the influence of a liquid herbicidal composition on the total weediness of crops of cereal crops are presented in table 3.

Table 3 shows that the proposed composition shows an efficiency comparable to the Status Max standard, which indicates the possibility of its use for controlling annual and perennial weeds in wheat and barley crops.

Thus, a liquid herbicidal composition in the form of an oily suspension concentrate containing the active ingredients thifensulfuron-methyl, tribenuron-methyl and flumetsulam, a dispersant, emulsifiers, rheology modifiers, a stabilizer of active ingredients selected from a number of acid and medium salts of alkali and alkaline earth metals of phosphorus, pyrophosphoric and carbonic acid and ammonium phosphate, and organic solvents, at the stated ratios of components, has increased stability and reduces the overall weediness of crops.

Claims (2)

Liquid herbicidal composition in the form of an oil suspension concentrate containing the active ingredients thifensulfuron-methyl and tribenuron-methyl, a dispersant, emulsifiers, rheology modifiers and organic solvents, characterized in that it additionally contains flumetsulam and a stabilizer of active ingredients selected from a number of acidic and medium alkaline salts and alkaline earth metals of phosphoric, pyrophosphoric and carbonic acids and ammonium phosphate, at the following ratios of components, wt.%: tribenuron-methyl 1-20 thifensulfuron-methyl 1-10 flumetsulam 1-10 dispersant 1-10 emulsifiers 4-20 active ingredient stabilizer 0.5-2.0 rheology modifiers 1-5 solvents rest