RU2415574C1 - Herbicide composition - Google Patents

Abstract

FIELD: agriculture.

SUBSTANCE: invention relates to the sphere of agriculture. Herbicide composition contains a mix of esters of alcohols of C₇-C₉ 3,6-dichloropyridine-2-carbonic acid of normal or isometric structure individually or in a combination and a tertiary alkylamine salt of 3,6-dichloropyridine-2-carbonic acid, which includes one alkyl radical with number of carbon atoms from 8 to 14, or mix of esters of alcohols of C₇-C₉ 2,4-dichlorophenoxyacetic acid of normal or isometric structure individually or in a combination and a ternary alkylamine salt of 2,4-dichlorophenoxyacetic acid, which includes one alkyl radical with number of carbon atoms from 8 to 14.

EFFECT: invention will make it possible to increase permeability of the composition.

6 cl, 5 tbl

Description

This invention relates to the crop production industry and is intended to control weeds in crops of grain, industrial and vegetable crops.

Closest to the proposed invention is the herbicidal agent described in patent RU 2326534, where the active substance 3,6-dichloropyridin-2-carboxylic acid (clopyralide) is presented in the form of esters of alcohols C ₇ -C ₉ and the herbicidal agent is in the form of a concentrate emulsions.

With a rather successful formulation of a drug with high biological activity, one drawback should still be pointed out. This refers to a relatively long (up to 2 weeks) period when it is possible to visually observe the effect of the drug, which negatively affects the herbicide users.

In order to eliminate the noted drawback, we proposed a new solution, the essence of which lies in the fact that the active substance in the composition is presented as a mixture of C ₇ -C ₉ alcohol esters of 3,6-dichloropyridine-2-carboxylic acid of normal or isostructure individually or in combination and a tertiary alkylamine salt of 3,6-dichloropyridin-2-carboxylic acid containing one alkyl group with carbon numbers from 8 to 14, or a mixture of esters of alcohols C ₇ -C ₉ 2,4-dichlorophenoxyacetic acid (2,4-D acid) normal or isostro individually or in combination and a tertiary alkylamine salt of 2,4-dichlorophenoxyacetic acid containing one alkyl group with the number of carbon atoms from 8 to 14, while the mass ratio of these clopyralid ester and clopiraralide salt or 2,4-D ester salt and salt 2 , 4-D acid in the herbicidal composition is 90: 10-10: 90, and the content of 3,6-dichloropyridin-2-carboxylic acid derivatives or 2,4-dichlorophenoxyacetic acid derivatives in the composition is 200-550 g / l in terms of acid. The proposed composition also contains a surfactant of nonionic or ionic type in an amount of 50-300 g / L. The composition may contain an organic solvent: xylene, oil or coal solvent, nefras, kerosene, xylene fraction, etc., or a mixture thereof.

This was made possible thanks to the established fact of increased permeability of clopyralid or 2,4-D acid in plants, presented in the form of an ether and in the form of a tertiary amine salt together, in comparison with an individual ether and tertiary amine salt.

The results of studies on the permeability of clopiraralide in various modifications (esters, tertiary amine salts (dimethylalkyl (C ₁₂ -C ₁₄ ) amine salt), mixtures of ether (esters) and salts) are presented in Table 1.

Table 1. Penetrating ability of clopyralid in plants, depending on modification * Type of modification The time from the start of processing, hour twenty 40 60 80 one hundred 120 140 % penetration of clopiraralide from applied DMAA clopiraralide salt fifty 54 58 61 70 75 80 Clopiraralide 2-ethylhexyl ester 32 40 56 63 71 82 90 Clopiraralide 2-methylhexyl ether 33 42 55 62 70 78 86 clopyralide octyl ether 31 40 55 60 69 76 84 mixture (65% clopiraralide in the form of 2-ethylhexyl ether, 35% in the form of DMAA salt) 52 65 72 85 94 96 96 mixture (70% clopiraralide in the form of 2-methylhexyl ether, 30% in the form of DMAA salt) 45 52 67 79 80 89 93 mixture (65% clopiraralide in the form of octyl ether, 35% in the form of DMAA salt) 47 58 69 80 88 91 94 mixture (65% clopiraralide in the form of octyl and isooctyl ethers 1: 2.35% in the form of DMAA salt) 49 60 70 82 90 95 96 * Sunflower is used as an object of processing.

As follows from Table 1, the penetration rate of a herbicidal composition containing a mixture of clopiraralide ester and clopiraralide salt was significantly higher than the penetration rate of individual clopyralid derivatives (ether or salt).

The results obtained suggest a high rate of exposure to weeds of the mixed preparation and a slight increase in biological activity.

The data below confirms what was said.

The preparation used was an emulsion concentrate (CE), where clopyralide is presented as a mixture of 65% 2-ethylhexyl ether and 35% dimethylalkyl (C ₁₂ -C ₁₄ ) amine salt (DMAA salt) (450 g / l in terms of clopyralide) and additionally contained surfactant (neonol AF 9-12, 200 g / l), the rest was a solvent (nefras AR 150/330).

As a comparative object, a herbicidal agent (RU 2326534) was used, where clopyralide is presented only in the form of 2-ethylhexyl ether (450 g / l in terms of clopyralide). Auxiliary components are the same as in the composition according to the invention.

The tests were carried out on sugar beet crops in the Taus experimental plot of the State Institution "NITIG AN RB" in the Republic of Bashkortostan (Table 2).

Table 2. Biological test results Clopiraralide Form Norma AI, g / ha Weeds,% death The time of death of weeds, days thistles chamomile sagebrush CE (450 g / l clopiraralide in the form of 2-ethylhexyl ether) 75 98 99 one hundred 12 CE (450 g / l clopiraralide in a mixture: 65% in ether 75 one hundred one hundred one hundred 5 and 35% in the form of DMAA salt) 65 99 one hundred 99 7

Similar results were obtained with the use of clopiraralide salt obtained from other tertiary alkyl amines and with a change in the ratio of the ether and salt forms of clopyralide (Table 3).

Table 3. Biological test results Clopiraralide Form Consumption rate Weeds,% death The time of death of weeds, days thistles chamomile sagebrush CE (450 g / l clopiraralide: 80% in the form of ether and 20% in the form of methylbutylalkyl (C ₁₀ -C ₁₂ ) amine salt) 70 99 one hundred 99 8 CE (450 g / l clopyralid: 20% in the form of ether and 80% in the form of diethylalkyl (C ₁₂ -C ₁₄ ) amine salt) 70 98 99 one hundred 6 CE (450 g / l clopiraralide in the form of 2-ethylhexyl ether) 75 99 one hundred 99 fourteen

The surface-active properties of the tertiary alkylamine salts of 3,6-dichloropyridin-2-carboxylic acid are shown in Table 4.

Table 4 The surface tension of 2% aqueous solutions of tertiary alkylamine salts of 3,6-dichloropyridine-2-carboxylic acids Salt Surface tension at the liquid-air interface, mN / m Dimethylalkyl (C ₁₀ -C ₁₂ ) Clopiraralide Amine Salt 30.8 Methylbutylalkyl (C ₈ -C ₁₂ ) Clopyralide Amine Salt 29.9 Diethylalkyl (C ₁₂ -C ₁₄ ) Clopiraralide Amine Salt 31.1

A similar pattern of increased permeability in plants is observed in the case of 2,4-dichlorophenoxyacetic acid, in a mixture of its esters C ₇ -C ₉ and tertiary alkylamine salt. The results of biological tests in crops of spring wheat, confirming the foregoing, are given in table 5.

The sample obtained according to this invention was compared with the well-known drug "OCTAPON-EXTRA" (RU 2163759).

Table 5. Biological test results Name Consumption rate, g / ha % death of young dicotyledonous weeds The time of death of weeds, day CE test sample, 500 g / l 2,4-D acid (56% 2,4-D acid in the form of 2-ethylhexyl ether, 44% in the form of dimethylalkylamine salt) 250 98 four Octapon-Extra, CE (500 g / l 2,4-D acid in the form of 2-ethylhexyl ether) 300 97.5 10

Claims (6)

1. The herbicidal composition comprising the active substance in the form of esters of normal or isotropic C ₇ -C ₉ alcohols individually or in combination, a surfactant, characterized in that it contains a mixture of C ₇ -C ₉ 3,6- alcohols and esters dichloropyridin-2-carboxylic acid of normal or isostructure individually or in combination and a tertiary alkylamine salt of 3,6-dichloropyridin-2-carboxylic acid, which includes one alkyl radical with carbon atoms from 8 to 14, or a mixture of C ₇ - C ₉ 2,4-di lorfenoksiuksusnoy straight or branched chain acids, individually or in combination and tertiary alkylamine salts of 2,4-dichlorophenoxyacetic acid, which comprises one alkyl radical having the number of carbon atoms from 8 to 14. 2. The herbicidal composition according to claim 1, characterized in that the mass ratio of esters of alcohols of C ₇ -C ₉ 3,6-dichloropyridin-2-carboxylic acid and the tertiary alkylamine salt of this acid or the mass ratio of alcohols of esters of C ₇ -C ₉ The 2,4-dichlorophenoxyacetic acid and tertiary alkylamine salt of this acid is 90: 10-10: 90. 3. The herbicidal composition according to claim 1, characterized in that the content of 3,6-dichloropyridin-2-carboxylic acid derivatives or 2,4-dichlorophenoxyacetic acid derivatives in the composition is 200-550 g / l in terms of acid. 4. The herbicidal composition according to claim 1, characterized in that it further comprises an organic solvent or a mixture of organic solvents. 5. The herbicidal composition according to claim 1 or 4, characterized in that it is presented in the form of an emulsion concentrate. 6. The herbicidal composition according to claim 5, characterized in that it is used in crops of useful plants from the group: crops, sunflower, sugar beets, flax, rape, cabbage.