CS221842B2 - Synergic means for selective destroying the weeds - Google Patents

Abstract

1. A synergistic composition for selectively controlling weeds, which composition comprises, on the one hand, a 4-(3',5'-dichloropyridyl-2'oxy)-alpha-phenoxypropionic acid propargyl ester of the formula I see diagramm : EP0043802,P15,F1 wherein Z is oxygen or sulfur, and, on the other, one of 3-(3'-chloro-4'-methylphenyl)1,1-dimethylurea (IIa), 3-(3'-chloro-4'-methoxyphenyl)-1,1-dimethylurea (IIb), 3-(4'-isopropylphenyl)-1,1-dimethylurea (IIc), 1-benzothiazol-2-yl-1,3-dimethylurea (IId), 4-hydroxy-3,5-diiodobenzonitrile (IIe) or 3,5-dibromo-4-hydroxybenzaldehyde-O-(2',4' -dinitrophenyl)-oxime (IIf), together whith carriers and/or other adjuvants.

Description

Z is oxygen or sulfur, and on the other hand a 2,6-dihalogenenol derivative of the formula II

X

wherein either R is cyano and X is iodine, or X is bromine and R is 2,4-dihydro-thieno-pyrimidomethyl, in a weight ratio of 1: 1 to 1: 25

The composition according to the invention is particularly suitable for the selective control of weeds in cereals.

The present invention relates to a synergistic composition comprising a combination of herbicidal active ingredients which is excellent for selectively controlling weeds in cereal crops. The invention also relates to the control of weeds, in particular in cereals, using the novel composition.

Currently, the most common and most important weeds in cereal crops are species of the genera Sinapis (mustard), Chrysanthemum (daisy) and certain Avena (deaf oats).

Propargyl esters of 4- (3 *, 5 * -dichloropyridyl-2 * -oxy) -alpha-phenoxypropionic acid of the formula I have proved to be excellent selective herbicides against monocotyledonous weeds in post-emergence application.

(I) in which:

Z is oxygen or sulfur.

Both compounds of formula I, i.e. 4- (3 *, 5 * 'dichloropyridyl-2 * -oxy) -alpha-phenoxypropionic acid propargyl ester of formula (Ia) and 4- (3 *, 5 * -dichloropyridyl-2 * propargyl ester) The oxoxy-alpha-phenoxythiopropionic acids of the formula Ib, their preparation and their use as selective herbicides are described in European Patent Publication No. 3,114.

As is well known, dicotyledonous weeds in cereals, but also some monocotyledonous weeds can often be combated successfully with post-emergence application using 2,6-dihalogenophenol derivatives of formula II

(II) in n $ m to bu3

R is cyano u

X is iodine, or

X is bromo and is 2,4-aminitrophenoxyiminomethyl.

The compounds encompassed by the general formula II are arranged in the following narrower formulas Ile and IIf:

4-hydroxy ^ro xy "3> IO ~ 5 ° dbenzonitril (ioxynil) IIe

J (Ile) and O - ^^^^ - ^ diiiioo ryLOoxim 3,5-d ^e b ° om-4-yn-Hydroxy ^{not d} 'eizaldeh du ⁿ (nromplienoxim) formula IIf

(Uf)

The compounds of formulas II and their herbicidal activity are described, for example, in the following drug:

sloučeninaωχτπΠ (compound of formula Ue) in Nature, Lond., 1963, 200-28 and BromOenoxim (compound of formula UO) in Proc. 3rd EWRC Symp. New Herbecides, Psais, 1969, p. 177 ·

It has now surprisingly been shown that in terms of certain mnnoslví meeích variable combination of two active compounds of formulas ¹ and ^11, has a synergistic effect ^ ^ki projecting into the cavity amortized POUR · p ^ et all important weeds in cereal crops, without damaging cereal crops. In doing so, the main weed species in cereals, such as the dicotyledonous species · dhrysanhemmum and Sinapis, as well as certain oat species (Avena) (deaf oats), are destroyed in a selective manner in the already developed cereal crops.

Surprisingly, the combination of the active compound of the formula I with the active compound of the formula II produces not only a principally expected summation effect in the spectrum of effects on habitual weeds resulting in cereal cultures, but with this combination achieves a synergistic effect which extends in two aspects.

Firstly, the applied amount of mono-active compounds of formulas I and II is substantially reduced with an equally good effect. Secondly, a high degree of weed control is achieved with the combined composition even where the two mono-active compounds in the range of too low application rates were completely ineffective. This results in a substantial widening of the spectrum of weeds that can be controlled and, moreover, an increase in the safety for cereal cultivation which is necessary and desirable for the unruly overdose of the active substance.

The composition according to the invention can be used, in addition to bent crops such as barley, rye and in particular wheat, also to selectively control weeds in other monocotyledonous plants with similar sensitivity to active herbaceous plants and to similar weeds such as for example in ketchup and rice. .

The active ingredient compound according to the invention contains the active compound of the formula I and one of the active compounds of the formula II in a free-flowing formulation, usually using an excess of one or the other component. Particularly preferred are the excess of component II in a ratio up to 1:25, but the ratio of components I: II = 1: 1 to 1:10 is particularly preferred.

The active compound combination according to the invention has an excellent weed action without breaking at 0.2 to 4 kg, preferably 0.5 to 3 kg per hectare, as is customary.

221842 4 in cereal cultures, somehow remarkably influenced by crop plants.

The present invention relates to such uses of the compositions of the invention, that is, a method of selectively controlling weeds and grassy weeds in cereals for post-emergence application of the composition.

The novel active ingredient composition according to the invention contains, in addition to the active ingredients mentioned, suitable carriers and / or other additives. These additives may be solid or liquid and correspond to substances customary in such compositions, such as natural or regenerated minerals, solvents, dispersants, wetting agents, adhesives, thickeners, binders or fertilizers. Thus, suitable application forms are, for example, emulsion concentrates, directly sprayable or dilutable solutions, dilute emulsions, wettable powders, soluble powders, dusts, granules, also encapsulated, for example, in polymeric substances. Application procedures such as spraying, fogging, dusting, sprinkling or potting are appropriately selected as well as the type of compositions according to the desired objectives and proportions.

Compositions containing as active ingredient a mixture of the active compounds of the formula I and of the formula II and optionally a solid or liquid additive and concentrates or other preparations of this type are prepared in a known manner, for example by thoroughly mixing and / or grinding the active compounds with fillers such as solvents, solid carriers, and optionally surfactants (surfactants).

Suitable solvents include: aromatic hydrocarbons, preferred C8-C12 fractions, such as xylenes or substituted naphthalenes, phthalic acid esters such as dibutyl phthalate or dioctyl phthalate, aliphatic hydrocarbons such as cyclohexane or paraffinic hydrocarbons, alcohols and glycols, as well as their ethers and esters, such as ethanol, ethylene glycol, ethylene glycol monomethyl ether or ethylene glycol monoethyl ether, ketones such as cyclohexanone, strongly polar solvents such as N-methyl-2-pyrrolidine, dimethylsulfoxide or dimethylformamide, and optionally epoxidized vegetable oils such as epoxide coconut oil or soybean oil, or water.

As solid carriers, for example for dusts and dispersible powders, natural stone flours such as limestone, talc, kaolin, montmorillonite or attapulgite are generally used. Highly disperse silicic acid or highly dispersed absorbent polymers may also be added to improve physical properties. Suitable granular adsorptive carriers for the granulates are porous types, such as pumice, brickwork, sepiolite, or bentonite, and non-sorptive carrier materials, for example limestone or sand. In addition, a large number of pre-granulated materials of inorganic or organic origin, such as in particular dolomite or comminuted plant residues, may be used.

Suitable surface-active compounds are non-ionic, cationic and / or anionic surfactants having good emulsifying, dispersing and wetting properties. Surfactants are also mixtures of surfactants.

Suitable anionic surfactants can be both water-soluble soaps and water-soluble synthetic surfactants.

Soaps include alkali metal, alkaline earth metal, or corresponding optionally substituted ammonium salts of higher fatty acids (C 10 -C 22), such as sodium or potassium salts of oleic acid or stearic acid, or mixtures of natural fatty acids which # are obtained, for example, from coconut oil or tallow oil. The fatty acid salts of methyl taurine must also be mentioned.

However, so-called synthetic surfactants are used more frequently, especially fatty sulfonates, fatty sulfates, sulfonated benzimidazole derivatives or alkylarylsulfonates.

Fatty sulphonates or fatty sulphates are generally present as alkali metal, alkaline earth metal salts or optionally substituted ammonium salts and contain an alkyl radical of 8 to 22 carbon atoms, the alkyl also including alkyl moieties of the aryl moieties such as sodium or potassium ligninsulfinic acid salt, dodecylsulfuric acid ester, or a mixture of fatty fatty alcohol esters made from natural fatty acids. This also includes salts of sulfuric acid esters and sulfonic acids of the fatty acid adducts of ethylene oxide. The sulphonated benzimidazole derivatives preferably contain 2 sulphosclippes and a C8-C22 fatty acid residue. Alkylarylalkyl phosphates are, for example, the sodium, calcium or triethano-ammonium salts of dodecylbenzenesulfonic acid, iibtylnsphthalenesulfonic acid or the condensation product of naphthalenesilphonic acid and forisldchydi.

Also contemplated are 1 (01O ^ ^ 01 01 ^ fosf) phosphates, such as, for example, salts of estophosphoric acid adducts of β-non-phenylene with ethylene oxide (4 to 14).

Nonionic surfactants which may be used are polyglycoliliphenyl or aliphatic alcohols, aliphatic alcohols, saturated or unsaturated fatty acids and alkylenes, which may contain 3 to 30 carbon atoms and 8 to 20 carbon atoms. 6 to 18 needles in the alkyl moiety of slyllenes.

Further suitable nonionic surfactants jsoi water rozpistné adiikty polyethylene oxide with polypropylene ^ y / around, and etUylcidisiiiopropylpropylenglykoeem alkylpoУπ) ^p ro yCeτgltykoeei.

C 1-C 10-Cli-C 1-C-C-C-C-C-C-C-C-C-C-C s-C-C-C s-C řetěz-C řetěz-C řetěz-C-C-C řetěz-C-C group. Said compounds usually contain from 1 to 5 units of ethyl englycol per unit.

Examples of nonionic surfactants include, but are not limited to, polyol glycol ethoxyethyl polyols, polyglycol ethers of oil, polypropylene polyethylene oxide adducts, tribenoxy propylene glycol ethanol, polyethylene glycol, and ethoxylate glycol ethers.

Also contemplated are acidic fatty acid esters derived from polyoxyethylene sorbitan, such as β (β-ethoxyethylene) lithium tertiary phthalate.

In executioners ^ C ^ ni ^ t ^ ^ yy IU předevěím surfactants are quaternary ammonium salts which ^the axis obsahuií I ^ t ^ ^t bs .t ^ i ^ e ^ IT Tosi ^ Na atoms at least one of Iový sI ^ ^b yte ^y with ^{8 and 22} carbon atoms and which ibsaauií as further subtSiticity lower, optionally halogenated. alkyl radicals, benzyl radicals or lower hУ ^<d? about χtalkylloé residues. These salts are preferably used in the form of halides, mesyulphates or ethylsulfates, and, for example, stearyl or di- ^2- fluorocyanide bromide may be mentioned.

Surfactants and agents in the manufacture of the compositions of the present invention are described, inter alia, in the following:

My Cutyheon * s Detection an ^d ^ ndediers AnuaV MC M is isM.ig Co ^o p., Д.ЗДетдей, New Jersey, 19719. Sisley and Wood, Encyclopedia if Surfaie Active Agents ^ Chemica PuibisUini Co, Iii. New York, 1964.

The active compound content of the commercially available active substances is between 0.1 and 95% by weight, preferably between 1 and 80% by weight.

Preferred compositions are in particular in the following composition (proyents means proyenta hmlnncsni):

up to 95%, preferably 10 to 80% to 5%, preferably 90 to 0% to 30%, preferably 2 to 20%

Solutions:

active ingredient: solvent:

surfactant:

Ernglutable concentrates: active ingredient: surfactant: liquid carrier:

Dust:

Active Active Substance Carrier:

up to 50%, preferably 10 to 40% to 40%, preferably 10 to 20% to 95%, preferably 40 to 80%

0.5 to 10%, preferably 2 to 8%

99.5 to 90%, preferably 98 to 92%

Suspeňzní končentoáty:

active ingredient: water:

surfactant:

SMUČčtelný powder:

active ingredient:

surfactant solid carrier:

Granulates:

active ingredient: solid carrier:

to 75 preferably 10 to 50% to 25%, preferably 90 to 30% to 40%, preferably 2 to 30% to 90% _t preferably from 10 to 80% and especially 20 to 60% 0.5 to 20%, preferably 1 to 15% 5 to 90%, preferably 30 to 70%

0.5 to 30%, preferably 3 to 15%

99.5 to 70%, preferably 97 to 85%

While conventional formulations are preferably concentrated formulations, generally dilute formulations are used for the final use. The dosage forms can be diluted to the ends. 0.001% of active ingredient.

Other biocidally active substances or compositions can be admixed with the prostheses described herein. Thus, the novel compositions may contain, for example, insecticides, fungicides, backeeicides, fungistatics, baakeeiosiatics or temutociia in addition to the compounds of formulas I and II in order to broaden the spectrum of activity.

The synergistic effect of the herbicides always occurs when the herbicidal effect of the active ingredient combination I + II is greater than that of the active compounds applied singly.

The expected growth of E plants for a given combination of two herbicides can be calculated as follows: cf. COLBY, S.R., Calculatitis Synneristic and Antagonist Response to Herbicide Combinnatons, Weeds 15, pp. 20-22, 196 * 7.

100 ALIGN!

Doing so means

X growth percentage (compared to untreated plants) with herbicide I treatment using p kg applied per hectare,

Ϊ the procenoo of growth with herbCium II treatment using q kg δρί ^ ονδ ^ ΐιο amount per 1 ha,

The expected growth in the plants is the control plants after treatment with the mixtures of herbicides I and I using the applied amount of p + q kg of active substance per hectare.

If the actually observed value is lower than the expected value E, then there is nergismu ^y.

The synergistic effect of the combination of the active substances Ϊ and ΪΪ is demonstrated by the following examples.

Example 1

The test plants were sown in a greenhouse in plastic skins containing 30 liters of striated horticultural soil. After emergence, the active compound combination is sprayed with an aqueous dispersion in the 2-3 leaf stage. Applied mm Dispersion Sine 50 ml per 1 m ² . ¹⁵ days P ^p s t ^ ture ^{10 and 20} ° C, relative vlhtossi mod ^d ear ⁶⁰ and ^70%, and ^p s daily watering housing ubssVují ¢ í plants attempt posit ^ i.

The degree of damage is evaluated linearly according to the following scale:

·: Artificial plant: medium effect: normal state

The following results were obtained for the various pornmry components in the smmsi and for the different amounts of active ingredients.

a) Table Ϊ ^T ^^ ^l ^ er ^ nce and akUvita smear and 4- (3 * 5 * · L ⁱ ichlurpyri ^diyl -2 ^/ -uxy) -a · ^fν and ^f iuox spring ^{y l} propionic acid (compound of formula Ta) and compounds of formulas U- and Uf and their mixtures in post-geemic application.

test wheat plant - Ccoibri

compound of formula kg / ha added ingredient kg / ha 0 0.5 1.0 0.5 0 0.25 1.0 0.5 1.0 0.5 0 a compound of formula Ue 9 9 6 8 8 7 9 9 a compound of formula Uf 9 9 6 9 9 7 9 9 test plant And véna fatua compound of formula I kg / ha 0 0.5 0.25 added ingredient kg / ha 1.0 0.5 0 1.0 0.5 0 1.0 0.5 compound of formula U- 9 9 2 2 2 2 2 2 a compound of formula Uf 9 9 2 2 2 2 2 2 test plant Sínapis arvensis compound of formula Za kg / ha 0 0.5 0.25 added ingredient kg / ha 1.0 0.5 0 1.0 0.5 0 1.0 0.5 a compound of formula Ue 1 2 9 1 2 9 1 2 a compound of formula Uf 2 3 9 1 1 9 1 2

Clirysanthemum segetum

0.5 0.25, 0.5 0.5 0, 0.5 0.5 0 0.5 0.5

test plant compound of formula Ia kg / ha added component kg / ha

a compound of formula IIa 2 4 9 2 3 9 1 3 compound of formula Uf 1 3 9 1 3 9 1 3

If the values calculated for the cumulative effect, according to the method described by Colby, are compared to the results in Table 1, then the observed growth values for the field mustard (Sinapis arvensis) and the daisy (Chrysanthemum segetum) are found to be lower than the effects calculated. This demonstrates the synergistic effect of the mixture of propargyl ester of 4- (3 *, 5'-dichloropyridyl-2 * oxy) -alpha-phenoxypropionic acid with compounds of formulas Не and Uf (cf. Table 2).

Table 2

Values calculated according to the method described by Colby to demonstrate synergism between 4- (3 *, 5 * -dichloropyridyl-2 * -oxy) -alpha-phenoxypropionic acid propargyl ester (compound of formula Ia) and compounds of formulas Ile and Uf.

test plant compound of formula Ia kg / ha added component kg / ha 1 n Colibri wheat 0.5, 0.5 o n o 0.25 1 n , 0 0 0.5 n 0 a compound of formula Ile 87 62 100 ALIGN! 75 100 ALIGN! 75 a compound of formula Uf 100 ALIGN! 62 100 62 100 ALIGN! 75 100 ALIGN! 75 test plant Avena fatua compound of formula Ia kg / ha 0.5 0, 25 added ingredient kg / ha 1 .0 0,5 1 , 0 O, 5 n it n 0 n ** 0 a compound of formula Ile 12 12 12 12 12 12 12 12 a compound of formula Uf 12 12 12 12 12 12 12 12 test plant Sinapis arvensis compound of formula Ia kg / ha 0.5 0, 25 added ingredient kg / ha 1 0.5 0.5 1 , 0 O, 5 n it n 0 n 0 a compound of formula Ile 1 1 12 12 1 1 12 12 a compound of formula Uf 1 12 12 25 1 12 12 25 test plant Chrysanthemum segetum compound of formula Ia kg / ha 0.5 0, 25 added ingredient kg / ha 1 0.5 0.5 1 , 0 O, 5 n it n 0 n 0 a compound of formula Ile 12 37 37 1 12 25 37 a compound of formula Uf 1 25 25 1 1 25 25

Note: n = measured value o = calculated value

(b) Table 3

Tolerance and activity propararlesteru 4- (3 * -5 * -dic Lorpyridyl ^h-2 * ^{oxy) -N-a} and fenoxythiopropionové ester (Compound Ib) and compounds of formulas. Ile and Ilf and mixtures thereof in postemergence applications.

test wheat plant

compound of formula i and kg / ha added component kg / ha 0 1.0 0.5 0 0.5 1.0 0.5 0 0.25 1.0 0.5 a compound of formula Ile 9 9 7 9 9 7 9 9 a compound of formula IIf 9 9 7 9 9 7 9 9 test plant Avéna fatua compound of formula Ia kg / ha 0 0.5 0.25 added ingredient kg / ha 1.0 0.5 0 1.0 0.5 0 1.0 0.5 a compound of formula Ile 9 9 2 2 2 2 2 2 a compound of formula IIf 9 9 2 2 2 2 2 3 test plant Sinapis arvensis compound of formula Ia kg / ha 0 0.5 0.25 added ingredient kg / ha 1.0 0.5 0 1.0 0.5 0 1.0 0.5 a compound of formula Ile 1 2 9 1 2 9 1 1 a compound of formula IIf 2 3 9 2 2 9 l l testená rostlána Chrysanteemim segettrn compound of formula Ia kg / ha 0 0.5 0.25 added ingredient kg / ha 1.0 0.5 0 1.0 0.5 0 1.0 0.5 a compound of formula Ile 2 4 9 2 2 9 2 3 a compound of formula IIf 1 3 9 1 3 9 1 3

If the values of the calculated Colby are summarized, with the results from Table 3, then (Sinapis arvensis) and the daisies are calculated. This proves synergistic

-2 * -oxy) -aalpha-phthalthylPropionic acid (compound of formula Ib) with compounds of formulas Ile and Iif (cf. Table 4) for the sum effect, according to the method he described finds that the observed growth rates in the mustard field segetum) are: lower than the effects of the propargyl ester mixture of 4- (3 *, 5 * -dichioropyridine)

Table 4

Values calculated by the method described by Colby, to prove the synergism between the ^p м? Gylrsterem ⁴ - ^{(3 *} 5 ^ILD ic ^h lor ^p yr ^d dyl22 -o ^{l y)) and} aalfar enoxyth ^{of the} Ppopp aoové acid amide (compound of Formula Ib) and compounds of formulas Ile and Iif.

Colibri wheat plants tested

compound of formula Ia kg / ha 0, , 5 0 , 25 added ingredient kg / ha 1 , 0 0 , 5 1 , 0 0, , 5 n 0 n 0 n 0 n 0 a compound of formula Ile 100 ALIGN! 75 100 ALIGN! 75 100 ALIGN! 75 100 ALIGN! 75 a compound of formula IIf 100 ALIGN! 75 100 ALIGN! 75 100 ALIGN! 75 100 ALIGN! 75

test plant Avena fatua

compound of formula Ia kg / ha added component kg / ha 1 n 0.5 0.25 1,0 0,5 , 0 0 0.5 n O n o n O the compound of formula IIe 12 12 12 12 12 12 12 12 compound. . of formula Uf 12 12 12 12 12 12 12 12 test plant Sinapis arvensis compound of formula Ia kg / ha 0, , 5 0.25 added ingredient kg / ha 1 , 0 0 , 5 1 , 0 0, , 5 n O n O n o n O a compound of formula He 1 1 12 12 1 1 1 12 a compound of formula IIf 12 12 12 25 - - - - test plant Citery sanitami segetum compound of formula Ia kg / ha 0, , 5 o, 25 added ingredient kg / ha 1 , 0 0 > 5 1 , 0 o, , 5 n O n O n o n O a compound of formula He 12 12 12 37 12 12 25 37 a compound of formula IIf 1 1 25 25 1 1 25 25 Note: n = measured value, o - calculated value

Examples illustrating the composition and preparation of formulations:

Example 2

Examples of compositions of synergistic mixtures of the active substances of formulas I and II (% =% in the afternoon)

(a) Lactable powder (a) (b) (c) (d) u

the active ingredient Ia or Ib 10% 20% 5% 30 % one of the active substances II 10% 40% 15% 30 % sodium lignin sulphonate 5% 5% 5% 5 % natriumlaarrls sufát 3% - 3% - sodium diisobenzylnaphthalene sulfonate - 6% - 6 % octylphenolpolynthylnngllkolnthnr (7 to 8 moles of ethyl acetate) - 2% - 2 % highly disperse silicic acid 5% 27 Mar: % 5% 27 Mar: % kaolin 67% - 67% -

The active compound mixture is mixed well with the ingredients and the mixture is ground well in a suitable mill. A wettable powder is obtained which can be diluted with water to suspensions of any desired concentration.

b) Enmuse Concentrate a) b) c)

the active ingredient Ia or Ib 5% 5% 12 % one of the active substances II 5% 20% 13 % lktllfnnllplllnthylnngllkllnthnr (4 to 5 mol 3% 3% 3 % Ca-dodinylbenzenesulfonate 3% 3% 2 % pollen oil (36 mol ^ Ну ^ го *! ^) 4% 4% 4 % cyclohexanone 30% 30% 31 % mixture of xylenes 50 '% 35% 35 %

Emulsions of any desired concentration can be prepared from these concentrates by dilution with water.

Dust and) (b) C) (d) the active ingredient Ia or Ib 2% 4% 2% 4% one of the active substances II 3% 4% 4% 8% talc 95% - 94% - kaolin - 92% - 88%

Directly usable dust is obtained by mixing the active ingredient mixture with the carrier and grinding the resulting mixture in a suitable mill.

Granules prepared by extrusion Active ingredient Ia or Ib One of the active ingredients II Naphthalignin sulphonate Carboxymethylcellulose Kaolin

and) (b) C) 5% 3% 5% 5% 7% 15% 2% 2% 2% 1% 1% 1% 87% 87% 77%

The active ingredient mixture is mixed with the additives and the resulting mixture is ground and moistened with water. This mixture is processed into a granulate by means of an extruder, which is then dried in an air stream.

e) Coated granulate

and).

(b) active substance Ia or Ib one of the active substances II polyethylene glycol (molecular weight 200) kaolin

1.5% 3%

1.5% 5%% 89%

The finely divided active compound mixture is uniformly applied to a kaolin moistened with polyethylene glycol in a suitable mixer. In this way a dust-free coated granulate is obtained.

f) Suspension concentrate and) (b) the active ingredient Ia or Ib 20 May % 20 May % one of the active substances II 20 May % 40 % ethylene glycol 10 % 10 % nonylphenolpolyethylene glycol ether (15 mol ethylene oxide) 6 % 6 % sodium lignin sulphonate 10 % 10 % carboxymethylcellulose 1 % 1 % 37% aqueous formaldehyde solution 0.2 % 0; > 2 % silicone oil in the form of a 75% aqueous emulsion 0.8 % 0. , θ % water 32 % 12 %

The finely divided active compound mixture is intimately mixed with the ingredients. A suspension concentrate is obtained from which suspensions of each desired concentration can be prepared by dilution with water.

Claims (2)

SUBJECT OF THE INVENTION A synergistic composition for the selective control of weeds, characterized in that, according to carriers and / or other additives, it contains, on the one hand, propargyl ester of 4- (3,5'-dichloropyridyl-2'-oxy) -alpha-phenoxypropionic acid, in general of formula I wherein Z is oxygen or sulfur, and on the other hand, a 2,6-dihalophenol derivative of the formula II wherein either R is cyano and X is iodine, or X is bromine and R represents a 2,4-dinitrophenoxyiminomethyl group in a weight ratio of 1: 1 to 1: 25 2. A composition according to claim 1, wherein the weight ratio of component I to component II It is 1: 1 to 1: 10.