CS238935B1 - Selective herbicide agent - Google Patents

Abstract

Herbal remedy to protect corn against broadleaf and grass weeds with increased potency characterized in that it comprises a mixture 2-ethylamino-4-chloro <5 R-6-S-izopropylaroino -triazine, 2,4-bis-isopropylamino-6-methylthio-S-triazine and 2-ethyl-6-methyl-N- (1-methoxy-2-propyl) -ohldracetanilide vo vzájoranom weight ratio a: b: ca2: 1: 2-4 up to 1: 2: 2-4.

Description

(54) Selective herbicidal composition

Selective herbicidal agent for the protection of maize against broadleaf and grass weeds with increased tactility, characterized in that it contains a mixture of 2-ethylamino-4-chloro-5'-6-isopropylaroino-S-triazine, 2,4-bis-isopropylamino-6- methylthio-S-triazine and 2-ethyl-6-methyl-N- (1-methoxy-2-propyl) -hldracethanilide in an equilibrium weight ratio of a: b: ca2: 1: 2-4 to 1: 2: 2-4 .

BACKGROUND OF THE INVENTION The present invention relates to a selective herbicidal agent for protecting corn against broadleaf and grass weeds with increased efficacy. The composition comprises a mixture of 2-ethylamino-4-chloro-6-isopropylamino-striazine (atrazine) with 2,4-bis-isopropylamino-6-methylthio-s-triazine / prometryne and 2-ethyl-6-methyl-N - (1-methoxy-2-propyl) -chloro-5-acetanilide (metolachlor).

It is known that intensive maize cultivation requires effective crop protection against weeds before emergence. i before, during or after sowing. The basic herbicides for the protection of maize with sufficient selectivity and residual effectiveness are triazines, in particular atrazine-based formulations.

The residues of these preparations may remain in the field even after harvesting the maize, mainly depending on the application rate, soil and climatic conditions. This limits, respectively. it excludes the possibility of including sensitive crops (beet, clover, poppy and others) in the crop rotation immediately after maize and also limits the cultivation of winter grains.

In the stands treated with atrazine-based products, especially grassy grass species, which multiply to an economically significant extent and require subsequent chemical intervention, are becoming a serious problem.

It has now been found that these deficiencies in the effect of atrazine, respectively. The compositions based on it can be effectively overcome by the application of a selective herbicidal agent for protecting corn against broadleaf and grass weeds with increased efficacy according to the invention.

The present invention provides that the active ingredient of the herbicidal composition is a mixture of [alpha] 2-ethylamino-4-chloro-6-isopropylamino-s-triazine (atrazine) of formula I,

Cl

Λ / ^{c 3}

CH ₀ -CH.-HN-N 4 'N-NH-CH 3

(1), (b) 2,4-Bis-isopropylamino-6-methylthio-s-triazine (prometryne) of formula II,

CH.

CH.

SCH, CH-HN- N ^ N -NH-CH 2 ^? In x ^c ">

/ 11 /.

CH, C / 2-ethyl-6-methyl-N- / l-methoxy-2-propyl / ChI <5racetanilidu / metolachlor / Formula XII, b, _x H CH ₃ CH ₂ O-CH _3/111 /

CH ₂ CH ₃ ^X ₁ CH ₂ or in a weight ratio of a: b: c 2: 1: 2 -4 to 1: 2: 2 -4 relative to each other.

The main advantage of the herbicidal composition according to the invention lies both in the synergism of the herbicidal effect and in the fact that it does not leave potentially harmful subsequent susceptible crops below.

The composition of the invention may be prepared either by direct mixing of the final atrazine, prometryne and metolachlor-based formulations or by mixing the active ingredients constituting the active ingredient of the composition of the invention. The composition according to the invention can be used for agricultural and horticultural purposes as such or in admixture with finishing aids which improve the effect of the composition according to the invention or which stabilize the composition depending on its intended use.

The composition according to the invention can be used e.g. in the form of a powder, microgranules, granules, a wettable powder, a liquid suspension concentrate, a low-volume formulation or an emulsifiable concentrate, prepared by methods generally used in the manufacture of pesticides.

In practice, the various types of compositions of the invention may be used as such or after dilution with water to a suitable concentration. As used herein, the term "processing aids" refers to carriers (diluents) as well as diffusers, emulsifiers, wetting agents, dispersing agents, binders, fillers, disintegrators and the like.

Liquid carriers are always understood as petroleum fractions such as petroleum, light oil, aromatic hydrocarbons such as toluene and xylene, alcohols such as methanol, butenol, glycol, ketones such as acetone, amides such as dimethylformamide, sulfoxides such as is dimethylsulfoxide, methylnaphthalene, cyhlohexane, animal and vegetable oils, fatty acids, fatty acid esters, and the like.

Solid carriers are always understood to be clay, kaolin, talc, diatomaceous earth, silica, calcium carbonate, montraorillonite, bentonite, feldspar, silica, alumina, sawdust and the like.

Surfactants are used as emulsifiers or dispersants.

Surfactants include antenna, cationic, nonionic, and amphoteric surfactants, such as sodium alcohols, stearyltrimethylammonium chloride, polyoxyethylene alkylphenyl ethers, lauryl betaine, and others.

The aforementioned types of compositions of the invention may be used alone or may be applied to the podium or to the place of destination in the form of a mixture with fertilizers or other agricultural or horticultural preparations.

When used in the above-mentioned% form, the concentration of the active ingredients of the composition according to the invention may vary depending on the form of the composition and the processing aids used, and is generally 4-95% by weight.

For various types of compositions, the preferred active ingredient content may vary. E.g. in the case of powder, the active ingredient content is 4 - 20% by weight and the excipients 80 - 96%> in the case of emulsifiable concentrate, the active compound content is 5 - 40 S and the excipients 60 - 95%} in the case of liquid suspension concentrates - 40% and excipient content 60-95 in the case of wettable powder, active ingredient content 20-80% and excipients 20-80%> in the case of granules and microgranules, active ingredient content 4-10% and excipients 90-96% .

The following examples illustrate but do not limit the scope of the invention.

EXAMPLE

Test substances:

Zeazine 50 DP containing the active substance 2-ethylamino-4-chloro-6-isopropylamino-5-trlazine / atrazine / 50%,

Prometrin S 50 containing 2,4-bis-isopropylamino-6-methyltlo-s-triazine / prometryne / 50% active substance,

Dual 500 EC containing the active substance 2-ethyl-6-methyl-N- (1-methoxy-2-propyl) -chloroacetanilide / metolachlor / 500.0 g per liter of preparation.

Test plants:

white mustard / Sinapis alba L. /, hedgehog / Echinochloa crus-galli /L./ P. Beauv./

Workflow: ‘

Seeds of test plants were poured into rows in PVC containers of 30.5 cm x 38.5 cm x 4 cm filled with untreated aluminous-sand pod. After sowing and leveling of the soil surface, the application of aqueous solutions of the test substances and their mixtures was not followed in appropriate graduated doses respectively. concentrations. The volume of application solution was 800 l. ha ^-1 .

The degree of herbicidal effect was determined by numerical weighing after the herbicidal symptoms had been eliminated on the test objects. The nature of the associated effect was determined by the Colby method. The results are shown in Table 1.

Example 2

Test substances:

Zeazine DP 50 - as in Example 1

Prometrin S 50 - as in Example 1

Dual 500 EC - as in Example 1 atrazine + prometryne as 50% DP with an active substance content of 300 g atrazine + 200 g prometryne in kg of the preparation

Test plants:

bar / Setaria spp. P. Beauv./, Echinochloa crus-gallí / L./ P Beauv./, broad-leaved loboda / Atriplex patula L. / Amaranthus retroflexus L. /, white rabbit / Chenopodium album L. /, wheatgrass Plasma / ELytrlgla repens /L./ Desv./, loose leaf / Polygonum, lapathif olium L. /, corn / Zea mays L. /

Workflow:

Variants were applied to the fields of 2.5 nx 10 m in four replicates with a back spray at a working pressure of 0.2 - 0.3 MPa at doses corresponding to the product per hectare, in an application volume corresponding to a volume of 800 l.ha ” ¹ . Spraying was performed after maize sowing before emergence.

Weed weeds and weeds were evaluated visually according to the EWRC evaluation scale, where for weeds 9 means plants healthy, undamaged and also means dead plants, in the case of crops vice versa.

The results of the two-year experiments are shown in Tables 2 and 3.

Tab. 1 - Comparison of the herbicidal effect of the three-component combination of atrazine + prometryne + metolachlor in several weight ratios of active ingredients and separately applied ingredients by determining the weight of plants in greenhouse conditions (pre-emergence application).

Zfl - observed effect in%, Ofl - expected effect in%, R - divided.

; Razine kg d.1.ha ¹ prometryne metolachlor Test objects Sinapis alba Kchinochloa crus-galli Embassy OU R Embassy OU R 0.05 - - 49.2 - - 13.3 - - 0,042 - - 11.2 - - 12.9 - - 0,036 - - 9.2 - - 11.2 - - 0,034 - - 0 - - 0 - - 0,031 - - 0 - - 0 - - 0,029 - - 0 - - 0 - - 0,025 - - 0 - - 0 - - 0,021 - - 0 - - 0 - - 0,018 - - 0 - - 0 - - 0,017 - - 0 - 0 - - 0.0155 - - 0 - - 0 - - 0.0145 - - 0 - - 0 - - 0.0125 - - 0 - - 0 - - 0.0105 - - 0 - - 0 - - 0,009 - - 0 - - 0 - - - 0.05 - 0 - - 0 - - - 0,042 - 0 - - 0 - - - 0,036 - 0 - - 0 - - - 0,031 - 0 - - 0 - - - 0,028 - 0 - - 0 - - - 0,025 - 0 - - 0 - - - 0,023 - 0 - - 0 - - - 0,021 - 0 - - 0 - - - 0,019 - 0 - - 0 - - - 0,018 - 0 - - 0 - - - 0.0155 - 0 - - 0 - - - 0,014 - 0 - - 0 - - 0.0125 - 0 - - 0 - - - 0.0115 - 0 - - 0 - - - - 0.0105 - 0 - - 0 - - - 0.0095 - 0 - - 0 - - - 0,009 - 0 - - 0 - - - 0.00625 - 0 - - 0 - - - 0.00525 - 0 - - 0 - - - 0.0045 - 0 - - 0 - - - - 0,083 0 - - 64.3 - - - - 0,076 0 - - 62.7 - - -. - 0,075 0 - - 61.4 - - - - 0,072 0 - - 60.0 - - - - 0,069 0 - 54.4 - - - - 0,063 0 - - 52.3 - - - - 0,056 0 - - 45.2 - ' - - - 0.05 0 - - 45.2 - - - - 0.0415 0 - - 39.0 - - - - 0,038 ' 0 - - 37.4 - - - - 0.0375 0 - - 36.6. - - - - 0,036 0 - - 34.0 - - - - 0.0345 0 - - 31.5 - - - - 0.0315 0 - - 29.5 - - - - 0,028 0 - - 17.0 - - - - 0,025 0 - - 7.5 - - - - 0,018 0 -  - 0 - -

- - 0.01575 0 - - 0 - - - - 0.0125 0 - - 0 - - 0.05 0,025 0.05 73.4 49.2 +24.2 66.8 52.5 +14 0,025 0.0125 0,025 18.8 0 + 18.8 55.6 7.5 +48 0.0125 0.00625 0.0125 - - - 34.0 0 +34 0,042, 0,021 0,063 30.4 11.2 +19.2 74.7 58.5 +16 0,021 0.0105 0.0315 5.5 0 + 5,5 34.9 29.5 + 5 0.0105 0.00525 0.01575 - - - 41.5 0 +41 0,036 0,018 0,072 - - - 62.7 64.5 - 1 0,018 0,009 0,036 - - - 41.5 34.0 + 7 0,009 '0.0045 0,018 - - - 28.2 0 +28 0.42 0,028 0,056 96.1 51.3 +44.8 72.6 52.3 +19 0,021 0,014 0,028 4.1 0 + 4,1 43.6 17.0 +26 0,034 0,023 0,069 61.3 0 +61.3 . 74.7 54.4 +20 0,017 0.0155 0.0345 - - - 41.5 31.5 +10 0,029 0,019 0,076 26.8 0 +26,8 69.3 62.7 + 6 0.0145 0.0095 0,038 - - - 44.8 37.4 + 7 0,031 0,031 0,063 46.0 0 +46.0 100.0 52.3 +47 0.0155 0.0155 0.0315 - - 68.5 29.5 +39 0,025 0,025 0,075 21.9 0 +21.9 82.2 61.4 +20 0.0125 0.0125 0.0375 - - - 32.8 36.6 - 3 0,021 0,021 0,083 - - - 72.6 64.3 + 8 0.0105 0.0105 0.0415 - - - 46.0 39.0 + 7 0,025 0.05 0.05 31.2 0 +31.2 79.3 45.2 +34 0.0125 0,025 0,025 - - - 60.0 7.5 +52 0,021 0,042 0,063 14.4 0 +14.4 80.5 52.3 +28 0.0105 0,021 0.0315 - - - 72.6 29.5 +43 0,018 0,036 0,072 30.3 0 +30.3 85.5 60.0 +25 0,005 0,018 0,036 - - - 63.9 34.0 +29

Ί

Table 2 - Forging total herb. effect of the three-component combination of zeazine + prometryne + + metolachlor and separately applied Zeazine under field conditions / year. 1982. Bonitation evaluation. X-atrazine, IX-prometryne

Herbicide Batch prep. Total herbicidal effect in experiments in q.kq ^-1 in kg.ha ^-1 at localities

/ Γ ¹ / vineyard Jablonica Trakovice straight lozorno Zeazine 50 500 2.5 5.5 6.0 4.0 8.0 4.5 I-IX / 'as 50 DP / + 300 + 200 + 2.5+ 2.0 2.0 1.0 5.0 1.5 dual +500 +3 Zeazine 50+ 300+ 2.5+ Prometryn S 50+ +200+ Dual 50+ +500 +3 - 2.0 1.0 4.0 1.5

Table 3 - Comparison of the average herbicidal effect of the three-component combination of zeazine + + nrometryne + metolachlor and separately applied zeazine under field conditions / year. 1981, 1982]. Bonitační hodnocení. I-atrazine, II-prometryne

Year 1981 1982 herbicide Zeazine 50 I + II / as 50 DP / + Dual 500 Zeazine 50 I + II / as 50 DP / + Batch prep. g / kg ^-1 / l ^-1 / 500 300 + 200 + +500 500 300 + 200 + +500 Batch prep. in kg.ha ¹ 2.5 2.5+ +3 2.5 2.5+ +3 Echinochloa. crus-galli 5.0 2.5 4.1 1.6 Polygonum snap. L. 3,0 1.5 Chenop. album L 2.0 1.5 1.8 1.2 dual 500 Zeazine 50+ 300+ Prometryn S 50+ +200+ 2.5+ dual 500 +500 +3 1.6 - 1.3 Amaranth. Atripls Elytrigia Setaria retro. L. pat · L. repens L. app. 2.0 - - - 1.5 - - - 3.1 1.0 ⁵ » ⁹ 4.4 1.7 1.0 3.0 1.2 1.8 1.0 2.6 1.5

Claims (1)

OBJECT OF THE INVENTION A selective herbicidal agent for the protection of maize against broad-leaved and grass weeds with enhanced activity, comprising a mixture of [alpha] 2-ethylamino-4-chloro-6-isopropylamino-S-triazine of the formula I Cl z -NH-CH CH CH (1), (b) 2,4-bis-isopropvlamino-6-methylthio-S-triazine of formula II ^H 3 ^{c /} h / ^CH 3 HC-HN- Ν -NH-C CH CH, a c) 2-Ethyl-6-methyl-N- (1-methoxy-2-propyl) -chloro-5-acetanilide of formula III CH, I, ^3, C-CH ₂ -O-CH ₃ COCH ₃ Cl ₂ -CH ₃ in weight ratio a: b: c = / 2: 1: 2 to 4 / to / 1: 2: 2 to 4 /