EA019229B1 - Gorchak herbicidal composite compound - Google Patents

Abstract

The invention relates to chemical agents for controlling unwanted vegetation, in particular, to persistent quarantine weed Acroptilon repens L. The invention is aimed at preparing a novel liquid herbicidal composition against quarantine Acroptilon repens L. weed using dicamba, clopyralid and picloram; enhancing herbicidal activity of said composition compared to known preparations and reducing to practically permissible minimum level of negative aftereffect of a composite preparation on a sensitive agricultural rotation crops. The inventive technical result is characterized in that the herbicidal composite composition for suppressing persistent quarantine weed Acroptilon repens L. comprises water-glycol solution of dimethylethanolamine salts of 2-methoxy-3,6-dichlorobenzoic acid (dicamba salt) and 4-amino-3,5,6-trichloropyridine-2-carboxylic acid (picloram solt) and 3,6-dichloropicolinic acid (clopyralid salt) in molar ratio 1:0,87-0,97:2,19-2,41. The Gorchak composite composition, water-glycol solution, has highly biological and economic effectiveness to control the persistent quarantine weed Acroptilon repens L. and what is more important manifests high environmental safety.

Description

The invention relates to chemical agents for combating unwanted vegetation and, above all, malicious quarantine weed, creeping mustard (Asgor Shoi hereik L.).

State of the art

Known synergistic herbicidal composition based on derivatives of chlorphenoxyacetic acid with substituents (I), which are used as C1, CH ₃ , dimethylamine, n-C1 ₂ -C _and alkyldimethylamine, n-C ₇ -C9 -alkyl and Y-cyclohexanone-0- (2-methoxy-3,6-dichlorobenzoyl) oxime (II) with a ratio of 1:11 equal to 1: (0.5-2), with the following content of components, wt.%: Chlorophenoxyacetic acid derivative - 12-43, W -cyclohexanone-0- (2-methoxy-3,6-dichlorobenzoyl) oxime - 10-20, surfactant 15-20, solvent - the rest [1]. The proposed composition can be used in agriculture to control perennial root shoots weeds, including pink mustard, on crops of grain crops.

Known means to combat hard-to-eradicate quarantine weed - creeping mustard, which includes 2-ethylhexyl ether + cinidone-ethyl (1.8-2.4 l), rimsulfuron + tifensulfuron-methyl (0.012-0.015 kg), metsulfuron-methyl (0.003-0.005 kg), water (57.6-147.6 L) [2]. The above agent is obtained by sequentially introducing into the water mother liquors of herbicides and mixing them for 20 minutes and is applied at the rate of 60-150 l / ha of working solution during budding - flowering of the weed. The disadvantages of the product include low chemical resistance, which does not allow for long-term storage of the drug associated with the use of aqueous solutions of sulfonylureas, as well as a high consumption rate.

Known herbicide Gorgon, VRK (ZAO firm August), which is a 50% water-soluble concentrate based on 350 g / l of MCPA acid +150 g / l of picloram. At doses of 1.5-3.5 l / ha (depending on the level of weediness of agricultural land with creeping mustard), the drug effectively destroys this quarantine weed [3].

However, a significant drawback of this drug is the long-term preservation of its active substances (AI), primarily piclorama, in chestnut and chernozem soils. A sufficiently strong negative effect of this herbicide in chestnut soil at a dose of 2.5 l / ha (the optimal dose recommended by August by the company for controlling mustard) is observed within 2 seasons after its use on crops of grain, corn, and especially on vegetable and melons cultures.

The recommendations of the Department of Agriculture and Food of the Government of Western Australia for the control of creeping mustard contain a herbicidal composition including the isopropanolamine salts of clopyralid - 300 g / l, piclorama - 75 g / l and 2,4-D - 300 g / l [4]. The recommended product is used in an amount of 11-12 l / ha with a ratio of components: clopyralid, picloram and 2,4-D - 4: 1: 4, and the tank mixture should contain at least 200 l / ha of water.

Significant disadvantages of the recommended remedy include residual phytotoxicity of soils, mainly due to clopyralid and picloram, for at least 20 months.

According to the recommendations of the California Department of Food and Agriculture (USA), for the effective control of creeping mustard cortinas, it is possible to use a combination of dicamba, clopyralid and picloram, which is prohibited for use in California, taken in a ratio of 2-4: 0.38-0.5: 1 at the beginning budding [5].

At the same time, a long, up to several years, high residual phytotoxicity of soils with respect to broadleaf, including trees, grasses and shrubs, as well as leguminous (for example, clover) plants was noted.

Known herbicidal compositions using dicamba, clopyralid and picloram [6, 7, 8, 9, 10, 11]. However, in the materials presented there is no data both on the use of these compositions for combating the above-mentioned quarantine weed, mustard creeping, and on the level of residual phytotoxicity of the soils polluted by them.

The purpose of the present invention is the development of a new herbicidal composition against quarantine weed creeping weed using dicamba, clopyralid and picloram; increased herbicidal activity of the specified composition in comparison with the drug Gorgon, VRK [3] and reduction to the practically acceptable minimum of the negative aftereffect of the composite preparation on sensitive crops of crop rotation.

Disclosure of invention

The goal is achieved in that the herbicidal composition for suppressing malicious quarantine weed of creeping mustard contains a water-glycol solution of dimethylethanolamine (DMEA) salts of 2-methoxy-3,6-dichlorobenzoic acid (DMEA-salt of dicamba) and 4-amino-3,5 , 6 trichloropyridine-2-carboxylic acid (DMEA salt of picloram) and 3,6-dichloropicolinic acid (DMEA salt of clopyralide) in a molar ratio of 1: 0.87-0.97: 2.19-2.41.

Initial tests of the mixture of herbicides were carried out in an artificial climate laboratory (LIC). As a model of test plants imitating dicotyledonous and cereal weeds, sunflower and spring wheat were used. Spraying of test plants of sunflower and spring wheat was carried out in a phase of 2 leaves. Accounting for the herbicidal effect of the drug was carried out 15 days after

- 1 019229 treatment by weighing the green mass of the studied test plants, and after 90 days the residual content of its a.v. in the soil.

During the initial tests in VCI conditions, the inventors unexpectedly found that at a relatively low dose, the combination of DMEA-salt of dicamba, DMEA-salt of picloram and DMEA-salt of clopyralide taken in a molar ratio of 1: 0.87-0.97: 2 , 19-2,41, has an unusually high herbicidal activity for test plants of sunflower and low toxicity for spring wheat.

The effect of the molar ratio of dicamba, picloram and clopyralide dimethylethanolamine salts on the herbicidal activity of the composition is illustrated in table. one.

Table 1

The molar ratio of AI The decrease in green mass of test plants,% of control DMEA salt of dicamba DMEA salt of piclorama DMEA-clopiraralide salt sunflower spring wheat one 0.94 0.58 62 14 one 0 1.16 47 nine one 0.69 0 54 10 0 one 1.27 63 fifteen one 0.87 2.19 82 8 one 0.92 2,32 84 7 one 0.97 2.41 86 8

As follows from the decrease in the green mass of the test plants, the lowest value for wheat and at the same time the highest value for sunflower, the molar ratio of dimethylethanolamine salts of dicamba, picloram and clopyralide is in the range 1: 0.87-0.97: 2.19-2, 41 respectively.

Determination of the phytotoxicity level of the Gorchak herbicidal composition with the optimal molar ratio of dimethylethanolamine salts of 2-methoxy-3,6-dichlorobenzoic acid (DMEA salt of dicamba), 4-amino-3,5,6-trichloropyridine-2-carboxylic acid (DMEA salt piclorama) and 3,6-dichloropicolinic acid (DMEA-salt of clopyralide) 1: 0.92: 2.32 when pre-emergence application was made in chestnut soil (Saratov region). Before planting the test plants, the Gorchak herbicidal composition was applied in various doses to the chestnut soil, after which the soil was thoroughly mixed, placed in vegetation vessels with a capacity of 600 g of soil, and the seeds of the test plants of sunflower and wheat were sown. The vessels were placed on racks in the VCI chamber, kept for 30 days at a temperature of 22 ° C during the day and 20 ° C at night; illumination of test plants in the experimental period was 20 thousand lux for 16 hours, without lighting - 8 hours / day .; humidity in the chamber 70%; watering at the level of 60% of PV.

After 30 days. the aerial mass of test plants was cut off, weighed, and compared with control plants not treated with the herbicidal composition Gorchak. The repetition of experiment 5 times.

The effect of the dose of the herbicidal composition on the level of phytotoxicity with respect to test plants (wheat and sunflower) is illustrated in table. 2.

table 2

Experience option Dose, ml / ha (in terms of AI) Weight of green maesa test plants g The decrease in green mass of test plants,% of control Wheat test plant The drug "Gorchak" (molar ratio) 1: 0.92: 2.3 62.5 1,04 nine 125 1,0 thirteen 250 0.54 53 500 0.36 69 750 0.3 74 The control 0 1.14 Sunflower test plant The drug "Gorchak" (molar ratio) 1: 0.92: 2.3 12.5 2.72 nine 25 1.78 41 fifty 0.16 95 one hundred 0 one hundred 200 0 one hundred The control 0 2.98

- 2 019229

At the same time, it was found that the maximum residual content of the Gorchak herbicidal composition in the soil after 90 days. at the maximum dose of 1.5 l / ha did not exceed 23% of the original.

As a result of the studies, the Gorchak herbicidal composition was developed, the composition and physicochemical properties of which are given in Table. 3 and 4.

Table 3

Drug code Mass fraction of AI, g / l The molar ratio of active substances Surfactant Sintanol BV, g / l Triethylene glycol, g / l Water DMEA Dicamba Salt DMEA A piclorama salt DMEA clopiraralide salt Gorchak, AGR 124.2 121,2 177.0 1: 0.92: 2.32 35,4 118.0 BEFORE 1000

Table 4

Drug code Density, g / m ³ pH Surface tension, Nm * 10 ' ³ Wetting angle, deg. elementary finite Gorchak, AGR 1,178 8.1 31.5 25 5

Field tests of the herbicidal composition Gorchak, AGR were carried out in the Surovikinsky district of the Volgograd region in 2007-2009. on steam fields PZK them. Lenin, clogged up to 40 pcs / m ^{2 with} malicious quarantine perennial weed, mustard creeping. Field trials were carried out in comparison with the preparation of ZAO August Gorgon company, VRK at a dose of 2.5 l / ha, which at this level of weediness of crops was recommended by the State Chemical Commission of the Russian Federation for the control of mustard [3]. Both drugs were used on a steam field during the budding phase of mustard plants (early August 2007) by spraying with an aqueous working solution at a rate of 200 l / ha. The area of the experimental plots is 100 m ² , the repetition is 3-fold. Two months after the application of both herbicides, the experimental plot was plowed with a dump plow to a depth of 22-25 cm, and in the spring, pre-sowing cultivation with 10-10 cm disc harrow was carried out.

In the spring of 2008, the experimental field was seeded with spring barley and corn, and in 2009, after pre-sowing cultivation of 10-12 cm, with sunflower.

The effect of the herbicidal composition Gorchak, AGR in comparison with the preparation Gorgon, VRK in the field on creeping mustard in crops of spring barley, corn and sunflower is presented in Table. 5 (biological effectiveness), 6 (economic efficiency in barley and corn crops) and 7 (economic efficiency on sunflower when sown 2 years after steam treatment).

Table 5 The biological effectiveness of herbicides in the treatment of steam a year before sowing barley and corn (counts during sowing crops and harvesting crops a year after herbicide treatment)

Experience option Weedy Creeping Weed Initial before treatment with herbicides a year before sowing crops (08/04/2007), pcs / m ² at the time of sowing crops (04/26/2008) at the time of harvesting crops (08/29/2008) pcs / m ² % weed control pcs / m ² % weed control 1. Control without herbicides 39 32 0 43 0 2. Gorchak, AGR in a dose of 1.5 l / ha 37 0.5 98.5 2 94.5 3. Gorgon, VRK at a dose of 2.5 l / ha 35 4 87.5 12 84.3

The effect of the herbicidal composition Gorchak, AGR in a dose of 1.5 l / ha in comparison with the drug Gorgon, VRK in a dose of 2.5 l / ha a year after their application in a steam field on the yield of spring barley and corn (economic efficiency) is presented in tab. 6.

- 3 019229

Table 6 Economic efficiency of herbicides in crops of barley and corn sown a year after treatment with steam preparations (treatment of steam on 08/04/2007, sowing crops on 04/26/2008, harvesting on 08/29/2008)

Experience option Harvest of spring barley grain Harvest green mass of corn c / ha % to control c / ha % to control 1. Control without herbicides 10.5 100.0 153.4 100.0 2. Gorchak, AGR in a dose of 1.5 l / ha 15.6 148.5 201.5 131.3 3. Gorgon, VRK at a dose of 2.5 l / ha 9.1 86.6 165.6 107.9 NDS ₁₀ 2.1 23,4

By the time of sowing spring barley and corn (04/26/2008), the content in the chestnut soil of Gorchak, AGR, obtained by bioindication in the conditions of the VCI chamber, amounted to 23.7% of the initial dose, and Gorgon, VRK - 70% of the initial dose.

The effect of the herbicidal composition Gorchak, AGR in a dose of 1.5 l / ha in comparison with the drug Gorgon, VRK in a dose of 2.5 l / ha two years after applying sunflower oil seeds to the crop is given in Table. 7.

Table 7

Economic efficiency of herbicides in the cultivation of sunflower 2 years after treatment or steam (steam treatment 04.08.2007, cultivation of sunflower in 2009)

Experience option Harvest sunflower oilseeds c / ha % to control 1, Herbicide-free control 12.6 100.0 2. Gorchak, AGR in a dose of 1.5 l / ha 16,4 130.1 3. Gorgon, VRK at a dose of 2.5 l / ha 7.8 61.9 NDS ₁₀ 2.9

By the time of sowing sunflower (04.21.2009), the total content in the chestnut soil of Gorchak, AGR amounted to 0.11 l / ha (13% of the initial dose), and Gorgon, VRK - 0.75 l / ha (30% of the initial doses).

The results of field experiments showed the high biological and economic efficiency of the Gorchak herbicide, AGR in a dose of 1.5 l / ha both a year after application of spring barley and corn in crops, and two years in sunflower crops. The drug effectively suppressed the growth and development of mustard creeping per year in a steam field and practically eliminated the appearance of rosettes of new shoots in crops during the next two years of observation, which suggests that it is highly effective against the viability of the root system of the weed. As a result of cleaning the mustard crops of the agricultural crops from the mustard with Gorchak, AGR, a statistically significant increase in the protected grain yield of spring barley, corn and sunflower was obtained both in comparison with the control without herbicides and with the Gorgon prototype, VRK at a dose of 2.5 l / ha.

Of particular note is the absence of the negative effect of the drug Gorchak, AGR in a dose of 1.5 l / ha on spring barley and corn, as well as the aftereffect on sunflower. At the same time, Gorgon, VRK at a dose of 2.5 l / ha effectively suppressed creeping mustard, but inhibited the growth and development of spring barley and corn one year after application, and severe inhibition of sunflower plants two years after application was especially noted.

The best use of the invention

569.25 kg of water, 124.2 kg of dimethylamine salt of 2-methoxy-3,6-dichlorobenzoic acid (DMEA-salt of dicamba) SAZ 1918-00-9, 121.16 kg of dimethylethanolamine 4amino-3,5,6 are loaded into a stirred reactor trichloropyridine-2-carboxylic acid (DMEA salt of picloram) SAZ 1918-02-1, 177 kg of 3.6 dichloropicolinic acid (DMEA salt of clopyralide) SAZ 1702-17-6, 34.5 kg of Syntanol BV TU 6-365744684- 85-90 and 118 kg of triethylene glycol SAZ 112-27-6. The mixing process is carried out at pH 7.9-8.1 and a temperature of 20-40 ° C until the components are completely dissolved.

The resulting herbicidal composition Gorchak, AGR is a homogeneous light brown liquid with a density of 1145 kg / m ³ , surface tension of 31.5-10 ^-3 N / m, initial and final contact angles of wetting of 25 and 5 °, respectively, and contains dimethylethanolamine salts 2-methoxy-3,6-dichlorobenzoic acid (DMEA salt of dicamba) and 4-amino-3,5,6 trichloropyridin-2-carboxylic acid (DMEA salt of picloram), as well as 3,6-dichloropicolinic acid (DMEA salt clopyralid) in a molar ratio of 1: 0.92: 2.32. The finished water-glycol solution of the herbicidal composition is packaged in 5 liter cans.

Gorchak herbicidal composition, AGR in a dose of 1.5 l / ha is applied on a steam field in

- 4 019229 phase of budding of mustard plants in the form of an aqueous solution at the rate of 200 l / ha. The degree of suppression of malicious quarantine weed mustard three months after treatment was 94.5%.

Thus, the proposed herbicidal composition has high biological and economic efficiency in the fight against malicious quarantine weed creeping mustard and, most importantly, high environmental safety.

The essential features of the invention are the combination of biologically active components of dimethylethanolamine salts of 2-methoxy-3,6-dichlorobenzoic acid (DMEA salt of dicamba) and 4 amino-3,5,6-trichloropyridine-2-carboxylic acid (DMEA salt of picloram), as well as 3,6 dichloropicolinic acid (DMEA-salt of clopyralide) to suppress the curtains of malicious quarantine weed - creeping mustard, as well as a molar ratio of agrochemically active components in the range of 1: 0.87-0.97: 2.19-2.41.

The technical result achieved is the herbicidal composition Gorchak, AGR, which has high biological and economic efficiency in the fight against malicious quarantine weed creeping mustard and, most importantly, high environmental safety.

Essential features are new, since their use in known technical solutions was not found, which characterizes the proposed technical solution in accordance with the novelty criterion.

A single set of new and common known essential features allows us to solve the problem and ensures the achievement of a technical result, which characterizes the proposed technical solution with significant differences compared with the prior art.

The new technical solution was obtained without reference and normative recommendations; it is the result of experimental work and creative contribution, which characterizes the compliance with its criterion of inventive step.

Information sources

1. RF patent No. 93007165, Α01Ν 39/04, Α01Ν 39/04, Α01Ν 35/10, 1995.

2. RF patent No. 2253231, Α01Ν 31/02, Α01Ν 41/10, 2005.

3. List of pesticides and agrochemicals approved for use in the Russian Federation, 2010

4. 1SHR: // \\ l \ lu.a8Psl \ 'a.8 OOU.ai / sop1sp1 / P \ ULUEEE / OESR / sgssrtd_kpar \\' ssb.rbG

5.1.Shr: // ^^^. Sat. sa dow / rrr8 / 1rs / teeb1pGo / asgor111op.yt # apsyog346119

6. International application \ ¥ 0 2010149732, Α01Ν 37/40, 2010.

7. German patent No. 19834627, No. 01 37/22; Α01Ν 37/40; Α01Ν 37/42, 1998.

8. French patent EB 2765075, Α01Ν 57/20; C07E 9/38; Α01Ν 57/00, 1997.

9. French patent EB 2763793, Α01Ν 25/04; Α01Ν 57/02, 1997.

10. European patent EP 0716808, Α01Ν 37/42; Α01Ν 43/42; Α01Ν 61/00, 1994.

11. US patent I8 5236887, Α01Ν 37/02; Α01Ν 37/06; Α01Ν 39/02; Α01Ν 39/04; Α01Ν 43/40; Α01Ν 43/90; A0Sh 47/36; A0Sh 37/02; Α01Ν 37/06; Α01Ν 39/00; Α01Ν 43/34; Α01Ν 43/90; Α01Ν 47/28, 1992.

Claims (1)

CLAIM A herbicidal composition for suppressing malicious quarantine weed creeping weed, containing a water-glycol solution of dimethylethanolamine salts of 2-methoxy-3,6-dichlorobenzoic acid (DMEA dicamba) and 4-amino-3,5,6-trichloropyridin-2-carboxylic acid (DMEA peak ) and 3,6-dichloropicolinic acid (DMEA clopiralide) in a molar ratio of 1: 0.87-0.97: 2.19-2.41. Eurasian Patent Organization, EAPO Russia, 109012, Moscow, Maly Cherkassky per., 2