CS230600B2 - Herbicide agent for selective destroing of weeds - Google Patents

Abstract

Active substance combination comprising - 1,3-dimethyl-3-(2-benzothiazolyl)urea of the formula <IMAGE> and - ethoxycarbonylmethyl 5-(2,6-dichloro-4-trifluoromethylphenoxy)- 2-nitro- alpha -phenoxypropionate of the formula <IMAGE> for selective control of weeds in crops of useful plants.

Description

(54) Herbicidal agent for selective weed control,

Vyyniez describes a novel active compound combination consisting of the known 1,3-dimethylamino-3- (2-benzthiazolyl) urea and the known ethoxycarboxylic acid substituted phenoxypropionic acid. This combination is particularly suitable for the selective control of weeds in crops of useful plants.

It is already known that 1,3-dieethl-3- (2-benzthiazolyl) -Erea can be used as a selectively acting herbicide (see Belgian Patent No. 687,019). It is known that carbon-felyl esters of phenoxycarboxylic acids, such as ethoxycarbonylmethyl ether = 5- (2,6-dichloro-4-trifluoromethylphenoOD) -2-nitro-11β-phenolppoopoic acid, can be used to selectively ^; weed control (see DE-QS 29 06 08 * 7). Although the aforementioned substances show good tolerability for crop plants, especially cereals, they have in some cases some deficiencies in the activity against important dicotyledonous and grassy weeds.

It has now been found that a new combination of active ingredients containing

1,3-diethyl-3- (2-benzthiazolyl) urea of formula I

CH3

AND

C - N - C - NH - CH

II

O a

5- (2,6-Dichloro-4-trifluoromethyl-phenoxy) -2-nitro-alae-phenoxy-propionic acid, ethoxycarbylmethyl-methyl ester of formula II

сн ₃

(II) exhibits high selective herbicidal activity.

Surprisingly, the herbicidal activity of the active compound combination according to the invention is considerably higher than that of the individual active compounds. It is therefore an unexpected synergistic effect and not just a complementary effect.

The active substances contained in the active ingredient compound according to the invention are already known (cf. Belgian patent specification 687 019 and DE-OS 29 06 087).

The synergistic effect of the commination of the active compounds according to the invention is particularly evident when they are active. the substances in formula I and II in the combination are present in certain weight ratios. However, the relative proportions of the individual active ingredients can vary within relatively wide meshes. In general, 1 part by weight of the active compound of the formula I is 0.02 to 1 part by weight of the active compound of the formula II.

The active compound combination according to the invention shows a very good action against dicotyledonous and grassy weeds in crops of useful plants, in particular in newspapers. By means of communicative and grassy weeds, in the word "sms" we mean all plants growing on the bases where they are undesirable.

The active compound combinations according to the invention can be used, for example, in the following plants:

dicotyledonous weeds of genera:

mustard (Sin ^ ^ pe), watercress (Adhesives), bedstraw (Galium), chickweed (Stellaria), camomile. (Mtrrcaala), Stem (An ^ hemis), PStou ^ (Galinsoga), Medicinal (Chenopodium), Nettle (Urtica), Ragwort (Senncio), Pigweed (Amrmonuc), Purslane (Portulaca), Beetle (Xanthium), Bindweed (ConoeSLnlCus) ), moth (Ipsmoea), moss (Polygons), sesiania (Sesie ^ a), ambrosia (AвOursta), thistle (Cirsiuo), thistle (Cardu—), vine (Sonchus), aubergine (Solanuo), Urukev (Horippa), Rotala, * Lindernia, Deadnettle (Larnium), Speedwell (Ve ^ once), aUlCilso (A ^ uuíIoo), Emax, durman (Dtuu * a), violet (Viola), cannabis (GGleosеt8), poppy (Papaver), cornflower ( Centawrea); _ f

Dicotyledons of genera:

Chestnut (Gssypium), Soybean (Glycine), Beet (Beta), Carrot (^ - ^ Bean (Pteueelue), Pea (Pisu ·), Potato (Solenum), Deer (Linum), Pork (^ (^ β) vetch (Vicia), tobacco (MiioSiana), tomato (tycosеrbicsn), underground oil (Arrahis), Uruvary (Brrasica), cucumber salad (СисшпОвО, gourd (^ (ηπΤ ^ β);

monocotyledonous weeds of genera:

hedgehog (ЕсНАпоск ^ оа), Uér (Setaria), millet (Panicům), dew (Digitaria), timothy (Phleum), fescue (Резуса), elcctioc (Eleúsine), Brachharia, rye (Lolivm), brome (Brsmuc), oats (Avéna), flatwood (Soretum sorghum), wheat (Agropyron), slag (Cynodonn, Mosnohhtba, Рlo0biвSnlit, arrowhead (Saaittaria), Elcschieiв, Sphorpus, Paspalum, Ischaoium, Sphinloctea, Sphinlocta) , distemper (Ag »otSi8), feather-tail (Apera);

Monocotyledonous plants of genera:

rice (Oryza), maize (Zea), wheat (Triticum), barley (Hordeum), oats (Avena), rye (Secale), sorghum (Sorghum), millet (Panicům), sugarcane (Saccharum), pineapple (Ananas) , asparagus (Asparagus), garlic (Allium).

However, the use of the active compound combinations according to the invention is by no means restricted to these genera but also to other plants in the same way.

Especially preferred is the good activity of the active compound combinations against dicotyledonous and grassy weeds which are difficult to control.

A decisive advantage of the active compound combinations according to the invention is that they can simultaneously control both dicotyledonous and grassy weeds, otherwise usually difficult to control.

The active compound combination according to the invention can advantageously be used for the selective control of weeds in maize and other cereals, such as in barley, oats, wheat and rye.

The active compound combinations according to the invention can be converted into the customary formulations such as solutions, emulsions, wettable powders, suspensions, powders, dusts, pastes, soluble powders, granules, concentrates based on suspensions and emulsions, natural and synthetic substances impregnated with active substances and small particles coated with polymeric substances.

These compositions are prepared in a known manner, for example by mixing the active compounds with fillers, i.e. liquid solvents and / or solid carriers, optionally with surfactants, i.e. emulsifiers and / or dispersants and / or foaming agents.

If water is used as a filler, it is also possible to use, for example, organic solvents as co-solvents. Basically suitable liquid solvents are: aromatics such as xylene, toluene or alkyl naphthenes, chlorinated aromatics or chlorinated aliphatic hydrocarbons such as chlorobenzenes, chlorethylenes or metixylene chloride, aliphatic hydrocarbons such as cyclohexane or paraffins, for example petroleum fractions, alcohols such as butanol, or glycol, as well as their ethers and esters, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, or cyclohexanone, strongly polar solvents such as dimethylformamide and dimethylsulfoxide, and water.

Suitable solid carriers are, for example: natural stone meal, such as kaolins, alumina, talc, chalk, quartz, attapulgite, montmorillonite or diatomaceous earth, and synthetic stone meal, such as highly disperse silica, alumina and silica. melted. Suitable solid carriers for the preparation of granulates are, for example, crushed and fractionated natural stone materials such as limestone, marble, pumice, sepiolite and dolomite, as well as synthetic granules of inorganic flours and granules of organic material such as sawdust, coconut shells »Corn sticks and tobacco stalks ·

Suitable emulsifiers and / or foaming agents are nonionic and anionic emulsifiers, such as polyoxyethylene fatty acid esters, fatty alcohol polyoxyethylene ethers, for example alkylaryl polyglycol ether, alkylsulfonates, alkylsulfates, arylsulfates and hydrolysates of proteins, and as dispersants, for example, lignin and sulphite waste

The compositions of the invention may include adhesives such as carboxymethylcellulose, natural and synthetic powdered, granular or latex polymers such as gum arabic, polyvinyl alcohol and polyvinyl acetate.

These compositions may contain bairrives such as inorganic pigments such as iron oxide, titanium dioxide and ferrocyanide blue, and organic dyes such as alizarin dyes, azo dyes, and metallic phthalocyanine dyes as well as trace elements such as iron, manganese salts. boron, copper, cobalt, molybdenum and zinc.

The concentrates generally contain between 0.1 and 95% of the hormone-active compound combinations, preferably between 0.5 and 90% of the combination.

The active compound combinations according to the invention can be used as such or in the form of compositions, even in combination with other known herbicides for controlling weeds, these known herbicides being present in the ready-to-use compositions according to the invention or of the invention, - or with the compositions containing them, to be mixed prior to application (tankmix). Further, the active compound combinations according to the invention can be combined with other known active substances, such as fungicides, insecticides, acaricides, nemaocides, avian protective agents, growth agents, plant nutrients and soil improvers.

The active compound combinations according to the invention can be applied as such, in the form of co-concentrated formulations or by further dilution of the formulations prepared therefrom, such as ready-to-use solutions, suspensions, emulsions, powders, pastes and granules. The application is carried out in the usual manner, for example by watering, spraying, dusting, tossing, and the like.

The active compound combinations according to the invention can be applied both before and after emergence of the plants. These combinations can also be incorporated into the soil before sowing.

The consumption of active substances can vary within wide limits and depends essentially on the type of effect desired. In general, the consumption is between 0.1 and 20 kg of active substance per hectare, preferably between 0.5 and 10 kg / ha.

The good herbicidal activity of the novel active compounds according to the invention is illustrated by the following examples. While there are weaknesses in the herbicidal activity of the individual active ingredients, the active compound combinations according to the invention exhibit an anti-weed effect which exceeds the sum of the individual active ingredients alone.

a synergistic effect on herbicides is always said if the herbicidal effect of the respective active compound combination is higher than the sum of the effects of the separately applied active compounds.

The expected effect for a given chamber of two herbicides can be calculated as follows (see SR Colby, (19), 1967, pp. 20-22, 1967). ) j if X = damage in% of herbicddeo A applied at p kg / ha,>

Y = damage in% of herbicide B applied at a rate of q kg / ha a

E = expected poisoning of herbicides A and B applied at doses p and j kg / ha, then

X; Y Ε = X + Ϊ - ---- 100

If the actual damage is higher than the damage calculated, the data of 0cm0ination has a higher, less cumulative effect and thus shows a sycergic effect.

The herbicidal effect found in the case of the commodities of the active compounds according to the invention is higher in dicotyledonous and grassy weeds than the calculated effect, i.e. there is a real synergistic effect. '

Example A

Efficacy test for post-emergence application

Solvent: 5 weight parts of acetone Emulsifier: 1 weight parts of alkylaryl polyglycol ether

To prepare a suitable active ingredient, a portion of the active ingredient or active ingredients is admixed with the aid of a solvent. Dilute the amount of the emulator and dilute with water to the specified conc.

At the first time, the test plants were sprayed at a height of 5 cm to 15 cm, so as to obtain the effective consumption of active ingredient per unit area. The spraying agent concentration is chosen so that the active substance or substance is always applied in 2000 liters of water per hectare. After 3 weeks, the plant damage is evaluated in%, compared to that of unarmed control plants. Significant% Moderate effect (slave as in non-greened plants)

100% complete destruction of plants.

In this test, the active compound combination according to the invention exhibits an effect which is higher than the sum of the effects of the individual coulololoates.

The results obtained are shown in Table A.

Table A

Pusteo-urgent test

Effective labels Consumption (kg / ha) Efficiency% Lolium Wheat Vyppčteno Found Vyppčteno (AND) 1 40 0 (II) 0.05 0 0 (I) + (II) 1 + 0.05 40 60 ' 0 0

The efficacy values in this table were calculated using the Colby formula above.

Claims (1)

object of the invention A highly effective composition for the control of weeds in useful crop plants, characterized in that it contains as active ingredients a combination of active substances consisting of 1,3-dioethyl-3- (2-baozthiazolyl) mesylate of formula (I). Γ ³ C - N - C - NH - CH 2 -> II o 5- (2,6-dichloro-4-trifluoromethyl-ethoxy) -2-nitro-alpha-phenoxy-propionic acid XI (II) α-ethoxycarbonylmethyl ester, wherein the weight ratio of the active compound of formula I to the active compound of formula II is between 1: 0.02 and 1: 1.