RU2698056C1 - Synergistic herbicidal composition - Google Patents

Abstract

FIELD: agriculture; chemistry.

SUBSTANCE: invention relates to agricultural industry, in particular to synergistic herbicidal compositions. Synergistic herbicidal composition containing N-(2,6-difluoro-phenyl)-8-fluoro-5-methoxy-[1,2,4]-triazolo-[1,5-c]-pyrimidine-2-sulphamide (florasulam) and 2',6'-fluoro-5-methyl[1,2,4]triazolo[1,5-a]pyrimidine-2-sulfonanilide (flumetsulam), additionally contains N-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-N'-(2-methoxycarbonyl-thien-3-yl-sulphonyl)-urea (thifensulfuron-methyl) with weight ratio of components (A) to florasulam: (B) flumetsulam: (C) of thiphenesulfuron-methyl, equal to 1:(0.2–12):(0.3–20), respectively.

EFFECT: disclosed synergistic herbicidal composition enables to effectively combat a variety of undesirable plants, development of synergetic herbicidal effect provides increase in herbicidal activity, at the same time pesticide load on environment is reduced.

1 cl, 5 tbl, 2 ex

Description

The present invention relates to a synergistic herbicidal composition containing florasulam, flumetsulam and tifensulfuron-methyl, intended to combat the growth of undesirable vegetation, preferably on cereals (including winter and spring wheat, barley, triticale, rye, etc.).

Protecting crops from weeds, which inhibits crop growth, is an ongoing unresolved challenge in agriculture. To help solve this problem, researchers in the field of synthetic chemistry have developed a very large number of chemicals and chemical compounds effective to combat such unwanted growth. Many types of chemical herbicides are described in the literature and a large number of these substances are used on an industrial scale.

There are times when herbicides are weak (or not active at all) with respect to certain weed species. The next criterion is the duration of action, respectively, the decay rate of the herbicide. In some cases, changes in the sensitivity of weeds that may occur with prolonged use of herbicides or in the case of geographic specificity (geographical restrictions) should also be taken into account.

The loss of activity in relation to individual plants can only be compensated conditionally, if at all possible, due to the large quantities of herbicides used. In addition, there is always a need for methods that can achieve the effectiveness of herbicides with less active substances. When using smaller amounts of active ingredients, economic costs are reduced and the environmental situation (tolerance) is improved when treated with herbicides.

The possibility of improving the profile (nature) of the use of the herbicide can consist in combining the active substance with one or more other active substances that bring the desired additional properties. However, the combined use of several substances often reveals phenomena of physical and biological incompatibility, for example, insufficient stability of the combined composition, decomposition of the active substance, or antagonism of the active substances. In contrast, combinations of active substances with a favorable action profile, high stability and, if possible, with an enhanced synergistic effect, which allow an increase in biological efficiency in comparison with the use of combined active substances separately, are desirable.

Known herbicides from the group of sulam N- (2,6-difluoro-phenyl) -8-fluoro-5-methoxy- [1,2,4] -triazolo- [1,5-c] pyrimidine-2-sulfamide (florasulam ), the amount used is 1-500 g ai / ha, preferably 1-50 g ai / ha, N- (4-methoxy-6-methyl-1,3,5-triazin-2-yl ) -N '- (2-methoxycarbonyl-thien-3-yl-sulfonyl) -urea (tifensulfuron-methyl), the amount used, as a rule: 0.5-120 g ai / ha, preferably 1-100 g AI / ha; 2 ', 6'-difluoro-5-methyl [1,2,4] triazolo [1,5-a] pyrimidin-2-sulfonanilide (flumetsulam) (amount used, usually: 5-1000 g ai / ha, preferably 10-600 g ai / ha.

Preparations based on florasulam and tifensulfuron-methyl are commercially in demand and are widely used in agriculture for the protection of crops (Handbook of pesticides and agrochemicals approved for use in the Russian Federation for 2018).

Florasulam provides a post-emergence control of broadleaf and cruciferous weeds in cereals and corn.

Tifensulfuron-methyl provides a post-emergence fight against annual dicotyledons in crops of grain crops, corn, and soy.

Flumetsulam provides a post-emergence control of broad-leaved weeds and some cereal weeds in crops of corn, soy and peas.

It has been shown that in some cases, herbicidal active ingredients are more effective in combination than when applied individually, and this is called "synergism". The present invention is based on the discovery that florasulam, flumetsulam and tifensulfuron-methyl, the herbicidal efficacy of each of which is individually known, exhibit a synergistic effect when used in combination.

Known synergistic herbicidal composition (RF No. 2599833) containing a herbicidally effective amount of (a) penoxulam and (b) phlorasulam, in which the ratio of the weight of penoxulam to the mass of florasulam is from about 17: 1 to about 1: 1.

Known herbicidal composition (RF No. 2488999) containing, as active substances, an effective combination of florasulam (I) or its salt and another sulfonylurea herbicide - tribenuron-methyl (II) or its salt in a weight ratio of 1:11 of 1: 5 up to 5: 1, as well as a solid carrier or liquid solvent and a surfactant. Active ingredients are taken in synergistically effective amounts.

Known synergistic herbicidal composition comprising (A) mesotrione and (B) flumetsulam, or their herbicidally active salts and the weight ratio of component (A) to component (B) is from 32: 1 to 1: 4 (RF No. 2286059).

Known herbicidal agent (RF No. 2273994) containing N-isopropyl-N- (4-fluorophenyl) -α- (5-trifluoromethyl-1,3,4-thiadiazol-2-yl-hydroxy) -acetamide (flufenacet) and a compound from the group comprising florosulam, while flufenacet and the compound from the above group are taken in a synergistically effective ratio. For 1 mass. including flufenacet from 0.02 to 500 mass. h. Florasulam.

The closest analogue to the claimed composition is the composition of the Derby preparation, including flumetsulam and florasulam, taken in a ratio of 1.33: 1 (Handbook of pesticides and agrochemicals approved for use in the Russian Federation for 2018, p. 597). The drug is used on cereals to combat annual and perennial dicotyledonous weeds, including types of sow thistle.

The technical task of the proposed solution: to develop a synergistic herbicidal composition for use in crops of grain crops, which has a wide range of herbicidal effects throughout the entire period of its growing season and, at the same time, does not show an environmental impact on subsequent crop rotation crops, which has high activity and long-term exposure.

The technical result achieved from the use of the proposed herbicidal composition is: the ability to deal with a wide variety of undesirable plants; the manifestation of a synergistic herbicidal effect; increase in herbicidal activity; reduction of environmental pollution.

This goal is achieved through the use of a synergistic herbicidal composition containing N- (2,6-difluoro-phenyl) -8-fluoro-5-methoxy- [1,2,4] triazolo- [1,5-s] pyrimidine -2-sulfamide (florasulam) and 2 ', 6'-difluoro-5-methyl [1,2,4] triazolo [1,5-a] pyrimidine-2-sulfonanilide (flumetsulam). The composition further comprises N- (4-methoxy-6-methyl-1,3,5-triazin-2-yl) -N '- (2-methoxycarbonyl-thien-3-yl-sulfonyl) -urea (tifensulfuron-methyl) when the weight ratio of the components (A) to the flurasulam: (B) flumetsulam: (C) tifensulfuron-methyl is equal to 1: (0.2-12) :( 0.3-20), respectively.

The combinations of this invention have very good herbicidal efficacy with respect to a wide variety of dicotyledonous weeds. These biologically active substances are also well suppressed and hard to suppress perennial weeds that develop from rhizomes, roots or other long-lived organs. It is preferable to use the post-emergence method or the early post-sowing-pre-emergence method.

Separately, as an example, we can name some individual representatives of dicotyledonous weeds that can be controlled by the compounds of this invention, however, this listing does not mean limitation to certain species.

Among dicotyledonous weeds, the spectrum of action extends to species such as, for example, Abutilon spp., Amaranthus spp., Chenopodium spp., Chrysanthemum spp., Galium spp., Ipomoea spp., Kochia spp., Lamium spp., Matricaria spp. , Pharbitis spp., Polygonum spp., Sida spp., Sinapis spp., Solanum spp., Stellaria spp., Veronica spp. And Viola spp., Xanthium spp., Paphaver rhoeas spp., Centaurea spp., Among annuals, and also on Convolvulus, Cirsium, Rumex and Artemisia spp. among perennial weeds.

When applying the herbicidal composition of biologically active substances to the green parts of the plant with the post-emergence method of treatment, a sharp stop in the growth also occurs very quickly after treatment and the weeds remain at the growth stage that existed at the time of treatment, or die completely after a certain time, so that it’s early and competition of weeds harmful to cultivated plants is eliminated for a long time.

The herbicidal agents according to this invention are characterized by a fast-setting and long-acting herbicidal action. Resistance to rain of biologically active substances of the combinations according to this invention is generally favorable. A particular advantage is that the dosages used and effective in the combinations of compounds (A), (B) and (C) are so small that their effect on the soil is optimally low. This not only creates the opportunity for their use in target crops, but also allows you to practically avoid pollution of groundwater. Using a combination of biologically active substances according to this invention, it is possible to significantly reduce the required expendable amount of biologically active substances.

With the combined use of herbicides of type (A) + (B) + (C) in the claimed composition, synergistic effects are manifested. Moreover, the effectiveness of the combination is higher than the expected sum of the efficiencies of the individual herbicides used. Synergistic effects can reduce the hectare rate of active substances while maintaining biological effectiveness or to achieve a higher herbicidal effect while maintaining consumption rates. They also allow the fight against a wide range of weeds, cause a more rapid onset of herbicidal action, increase the duration of action, cause better control of weeds in one, respectively small number of applications.

These properties and advantages are useful in the practical control of weeds to protect crops from undesirable competitive plants and thereby guarantee qualitatively and quantitatively and / or increase yields. The technical standard for the described properties is clearly exceeded by these new combinations.

The composition may also contain agriculturally acceptable excipients.

Example 1. Assessment of the biological effectiveness of active substances.

Artificial Climate Laboratory (LIC);

sunflower - a model of dicotyledonous weeds

Test conditions:

Spraying plants in a 2-4 leaf phase for dicotyledonous weeds.

Sowing in the soil to a depth of 3-4 cm, 4 repetitions per variant.

Growing at 22-23 ° C and a lighting mode of 10,000 Lux at a 16-hour daylight.

The accounting term in the experiment is the 14th day after processing (dicotyledonous).

The results of evaluating the comparative level of phytotoxicity of various herbicidal preparations for spring barley are shown in table 1.

According to the results of statistical processing, the following data on the synergy coefficient were obtained. The calculation was as follows.

The calculations of the synergetic (additive, antagonistic) interaction were carried out according to the Colby-Limpel formula:

where E _expect is the “expected” effect of the composite preparation (A + B + C);

A -% reduction in the ground weight of the test plant from the use of the herbicide A individually at a dosage close to its content in the composition;

B -% reduction in the ground mass of the test plant from the use of herbicide B in the manner similar to the previous one;

C -% reduction in the ground mass of the test plant from the application of the herbicide B in the same order.

If the ratio between experimentally observed effectiveness (E _exp .) And expected efficiency (E _expect ) is a synergistic factor (SF) - more than 1, the mixture exhibits a synergistic effect:

This synergistic effect guarantees increased reliability in the fight against competing weeds of crops, leading to a significant reduction in the amount of active ingredient required for weed control.

Example 2. Biological tests

The herbicidal composition (tifensulfuron methyl 90 g / L + flumetsulam 24 g / L + Florasulam 18 g / L) was used as an oil dispersion (MD). A mixture of flumetsulam 100 g / l + florasulam 75 g / l in the form of a suspension concentrate (CS) was used as a reference.

Appointment: a herbicide for fight against annual and perennial dicotyledonous weeds, including types of a sow thistle and ankle.

Experiment period: growing season 2018

Soil-climatic zone: II - zone of chernozems of the steppe and forest-steppe regions, Central Black Earth region of crop cultivation

Harmful objects:

Tender stalk - Galium aparine L.

Convolvulus Fallopia - Fallopia convolvulus (L.) A. Love

Chistets annual - Stachys annua (L.) L.

White Mary - Chenopodium album L.

Common Silene - Silene vulgaris (Moench) Garcke

Field Violet - Viola arvensis Murray

Annual sunflower (scavenger) - Helianthus annuus L.

The weed development phase is shown in table 2

Method of application: spraying vegetative plants

Herbicide protective period: during the growing season

Test results: presented in tables 3-5.

Additional information about the action of the herbicide: visually negative effects after 2, 7, 15 and 30 days after treatment with the proposed herbicide on the crop plants were not detected.

Discussion of the results of the experiment

The experience in assessing the biological effectiveness of the proposed herbicide was laid in the spring in the phase of the output of spring wheat Daria in the tube. The initial contamination of the experimental plot was 53 ind./m ² . The most common weeds were: annual sunflower scavenger, tenor coleweed, fallopian bindweed, annual cleaner, white gauze, common raspberry and field violet.

In the variants with the application of 0.2, 0.25 and 0.3 l / ha of the herbicide, the decrease in the total number of weeds was 91.0-97.5%, their weight reduction was 95.1-99.6%, which was higher efficiency of 0.07 l / ha standard (table. 3).

All weed species presented in the experiment showed a high sensitivity to the Pixel herbicide, MD (see Table 4).

The yield of wheat of the spring variety Daria when using the proposed herbicide (see table. 5)

findings

The biological efficacy of 0.2, 0.25 and 0.3 l / ha of the tested herbicide was higher than the efficiency of the standard.

The use of the new herbicide was safe for the protected crop.

Claims (1)

A synergistic herbicidal composition containing N- (2,6-difluoro-phenyl) -8-fluoro-5-methoxy- [1,2,4] triazolo- [1,5-c] pyrimidine-2-sulfamide (florasulam ) and 2 ', 6'-difluoro-5-methyl [1,2,4] triazolo [1,5-a] pyrimidin-2-sulfonanilide (flumetsulam), characterized in that the composition further comprises N- (4-methoxy -6-methyl-1,3,5-triazin-2-yl) -N '- (2-methoxycarbonyl-thien-3-yl-sulfonyl) -urea (tifensulfuron-methyl) in a weight ratio of components (A: B: C) Florasulam: flumetsulam: Tifensulfuron methyl, respectively 1: (0.2-12) :( 0.3-20).