FI65531B - MEDEL FOER TILLVAEXTREGLERING ELLER I SYNNERHET FOER AVLOEVANDE AV VAEXTER - Google Patents

Description

65531

Preparation used to control the growth of plants or, in particular, to remove leaves from plants

The invention relates to a preparation for the removal of leaves from plants, in particular cotton, or to the control of plant growth, which contains a mixture of 1,2,3-thiadiazol-5-yl urea-5 or 1,2,3-thiadiazolin-2-idi derivatives with basic reactants.

The 1,2,3-thiadiazol-5-yl urea and 1,2,3-thiadiazole-2-id derivatives are previously known substances for removing plant leaves (DE-A-10 2 506 690 and 2 619 861 and 2 719 810). However, these active substances do not have a sufficient effect in all cases.

In addition, mixtures of 1,2,3-thiadiazol-5-yl-stream substances with other leaf removal agents are known, in which, when used alone, the agents which have a weaker or stronger effect on leaf removal strengthen each other (DE application 2 646 712). The synergistic effect of these mixtures is thus dependent on the two already active compounds.

DE-A-2 914 164 discloses preparations for removing leaves from crops, in which a leaf-removing herbicide, preferably a phenyl urea or a triazine compound, and a solvent for the metallurgical industry, preferably an amine or a plasticizer of a polymeric compound, are used as active ingredients.

The object of the present invention was to provide a preparation suitable for removing plant leaves in which the potency of a known 1,2,3-thiadiazol-5-yl urea or 1,2,3-thiadiazolin-2-idi derivative is increased. substances not acting as such.

According to the invention, this is achieved by a preparation containing a leaf removal 1,2,3-thiadiazol-5-yl urea substance or a 1,2,3-thiadiazolin-2-idide derivative in admixture with a basic reactant.

According to the invention, suitable foliar removing compounds are: A) 1,2,3-thiadiazol-5-yl urea derivatives of the general formula 2,65531

N-C - H

s II II f / Ri

N .C-N-C-N

R 1 is hydrogen or a C 1 -C 4 alkyl group, R 2 is a C 1 -C 4 alkyl group, a C 1 -C 6 cycloalkyl group, phenyl, halophenyl, C C 1 -C 4 alkylphenyl, C 1 -C 4 alkoxyphenyl, nitrophenyl or trifluoromethylphenyl group, unsubstituted or singly or multiply by identical or different C 1 -C 4 alkyl or C 1 -C 4 alkoxy groups, halogen towers, A pyridyl or pyrimidyl group substituted by nitro or trifluoromethyl groups, or R 1 and R 2 together with the N atom form a morpholino, piperidino or pyrrolidino group, R 8 is hydrogen or a C 1 -C 4 alkyl group, and X is an oxygen or a sulfur atom; 20 B) 1,2,3-Thiadiazoline-2-idi derivatives of the general formula Θ /

W N == r - C

X Rx

25 N C = N - C - £) II

K 2 wherein R 1 is hydrogen or a C 1 -C 6 alkyl group, R 2 is hydrogen or a C 1 -C 6 alkyl group, a C 8 -C 8 cycloalkyl group, phenyl, halo-phenylphenyl, C 1 -C 6 -alkylphenyl, C A C 1 -C 4 alkoxyphenyl, nitrophenyl or trifluoromethylphenyl group, unsubstituted or pyridyl substituted by mono- or polysubstituted or different C 1 -C 4 alkyl groups, C 1 -C 4 alkoxy groups, halogen towers, nitro or trifluoromethyl groups, or pyrimidyl group, or R 1 and R 2 together with the N atom form a morpholino, piperidino or pyrrolidino group, and B is an alkali metal atom, preferably a lithium, sodium or potassium atom, or the corresponding zinc, manganese, calcium, the equivalent of a magnesium or barium atom, and X is oxygen or sulfur.

Examples of compounds of formula I which may be mentioned are: 1-phenyl-3- (1,2,3-thiadiazol-5-yl) urea 1-phenyl-1-methyl-3- (1,2,3-thiadiazole) 5-yl) urea 1- (4-chlorophenyl) -3- (1,2,3-thiadiazol-5-yl) urea 10-cyclohexyl-3- (1,2,3-thiadiazol-5 -yl) urea 1- (3-chlorophenyl) -3- (1,2,3-thiadiazol-5-yl) urea 1- (4-methylphenyl) -3- (1,2,3- thiadiazol-5-yl) urea 1- (3-methylphenyl) -3- (1,2,3-thiadiazol-5-yl) urea 1- (3,4-dichlorophenyl) -3- ( 1,2,3-thiadiazol-5-yl) urea 1-methyl-3- (1,2,3-thiadiazol-5-yl) urea 1,1-dimethyl-3- (1,2-thiadiazol-5-yl) 2,3-thiadiazol-5-yl) urea 1,1-dimethyl-3-methyl-3- (1,2,3-thiadiazol-5-yl) urea 25 l-methyl-3-methyl -3- (1,2,3-thiadiazol-5-yl) -urea 1-phenyl-3- (1,2,3-thiadiazol-5-yl) thiourea 1- (4-chlorophenyl) - 3- (1,2,3-Thiadiazol-5-yl) thiourea 30- (2-pyridyl) -3- (1,2,3-thiadiazol-5-yl) urea 1- (5- chloro-2-pyridyl) -3- (1,2,3-t iadiazol-5-yl) urea 1- (4-methyl-2-pyridyl) -3- (1,2,3-thiadiazol-5-yl) urea 35 1- (4-methyl-2- pyrimidyl) -3- (1,2,3-thiadiazol-5-yl) urea 4,65531 1- (4-pyridyl) -3- (1,2,3-thiadiazol-5-yl) urea 1- (3-pyridyl-3- (1,2,3-thiadiazol-5-yl) urea 1- (2-pyrimidyl) -3- (1,2,3-thiadiazol-5-yl) urea substance 1- (3-methyl-2-pyridyl) -3- (1,2,3-thiadiazol-5-yl) -5 urea 1- (5-methyl-2-pyridyl) -3- (1, 2,3-thiadiazol-5-yl) urea 1- (6-methyl-2-pyridyl) -3- (1,2,3-thiadiazol-5-yl) urea.

Examples of compounds of general formula II include: 5- (phenylcarbamoylamino) -1,2,3-thiadiazolin-2-yl, Na salt. H 2 O 5- (phenylcarbamoylamino) -1,2 / 3-thiadiazolin-2-yl, 15 Ca salt.8H 2 O 5- (phenylcarbamoylamino) -1/2,3-thiadiazolin-2-di, K salt .H 2 O 5- (phenylcarbamoylimino) -1,2,3-thiadiazolin-2-yl,

Li salt 4H 2 O 20 5- (methylphenylcarbamoylamino) -1,2,3-thiadiazoline

2-idi, Na salt.HjO

5- (methylphenylcarbamoylimino) -1,2,3-thiadiazolin-2-yl, K-salt.H 2 O 5- (methylphenylcarbamoylamino) -1,2,3-thiadiazolin-2-2-yl / Li salt. H 2 O 5- (2-pyridylcarbamoylamino) -1,2,3-thiadiazolin-2-yl, Na salt. 1,51- [5- (2-Pyridylcarbamoylimino) -172,3-thiadiazoline-2-yl] -N-salt. idi, Li salt.H 2 O 5- (phenylthiocarbamoylamino) -1,2,3-thiadiazolin-2-yl, Na salt.H 2 O 5- (phenylcarbamoylamino) -1,2 / 3-thiadiazolin-2- 35 idi, Mg salt.2H2O 5 65531 5- (phenylcarbamoylamino) -1,2,3-thiadiazolin-2-yl, Zn salt. 31 ^ 0 5- (phenylcarbamoylamino) -1,2,3-thiadiazolin-2-yl, Mn salt. 31 ^ 0 5 5- (phenylcarbamoylamino) -1,2,3-thiadiazolin-2-yl, Ba salt 3H-0 These compounds are particularly suitable for use according to the invention in 1-phenyl-3- (1/2, 3- diazol-5-yl) urea 1- (2-pyridyl) -3- (1,2,3-thiadiazol-5-yl) urea 5- (phenylcarbamoylamino) -1,2,3 thiadiazole-2-idi salts.

Non-active, base-reactive substances suitable for use in accordance with the invention include, for example: alkali hydroxides, for example sodium and potassium hydroxide, amines, such as alkylamines, e.g. triethylamine, alkanolamines, e.g. diethanolamine, triethanol-20-amine and triisopropanolamine, carbonates such as sodium carbonate, potassium carbonate, ammonium carbonate, phosphates such as tertiary phosphates, e.g. tri-sodium phosphate, tripotassium phosphate, pyrophosphates such as tetrasodium pyrophosphate or tetrakotassium alkali,

Preferably, substances are used which give the preparation according to the invention a pH of more than 8, preferably 9.5-11.5.

The preparation according to the invention has surprisingly been found to have a better effect than its various components. It is thus particularly suitable for decontamination of woody wool plants, in which case picking machines can be very suitable for harvesting cotyledons 6 65531. However, decontamination and growth of other plants can also be advantageously influenced, such as promoting afforestation, branching, grasses and dicotyledons such as hibiscus to prevent the growth of roots of other tree species. It is to be understood that the preparation according to the invention can be used for both foliar removal and growth control of plants.

It is clear to a person skilled in the art that foliar removal is not considered to be a herbicidal effect and that the death of the treated plants is even less desirable because the leaves remain attached to the dead plant and the productive parts of the plant are damaged. The purpose of leaf removal 15, which is to facilitate harvesting and obtain a cleaner yield, is then not achieved. Therefore, it is necessary for the plant to survive and for the leaves to come off and fall off. This makes it possible for the productive parts of the plant to develop further, in which case the regrowth of the leaves of the sa-20 bat should be prevented. The preparation according to the invention solves all these tasks in an excellent manner, so that it considerably exceeds the state of the art.

The preparation according to the invention can also always be used in admixture with other active ingredients, e.g. foliar, plant protection or pesticides, depending on the desired effect.

In addition, the effect and the rate of action can be enhanced, for example, by additives which enhance the effect, such as organic solvents, wetting agents and oils. In this case, it is possible to further reduce the application rates of the actual active ingredients.

The mixture according to the invention is expediently used in the form of preparations, such as powders, spreads, solutions, emulsions or suspensions, which additionally contain liquid and / or solid carriers or diluents and optionally wetting, fixing, emulsifying and / or wetting agents. or dispersing aids.

Suitable liquid carriers are e.g.

water, aliphatic and aromatic hydrocarbons such as benzene, toluene, xylene, cyclohexanone, isophorone, dimethyl sulfoxide, dimethylformamide and further mineral oil fractions.

10 Suitable solid carriers are, e.g.

bentonite, silica gel, talc, kaolin, attaclay, limestone, silicic acid and plant products such as flour.

Examples of surfactants which may be mentioned are sodium and calcium lignin sulfonate, poly-15-oxyethylene alkylphenyl ethers, naphthalenesulfonic acids and their salts, phenol sulfonic acids and their salts, formaldehyde condensates and fatty alcohols, fatty alcohol sulfates, long chain

The amount of the composition of the invention in the various preparations can vary within wide limits. The preparations contain, for example, from about 5 to 95% by weight of this mixture, from about 95 to 5% by weight of liquid or solid carriers and possibly up to 30% by weight of surfactants.

The weight ratio of the composition of the invention should be such that about 1 to 1 part by weight of inert alkaline substance per part by weight of the foliar active agent, the weight ratio of the mixture being determined by plant resistance, shelf life, weather conditions and soil conditions. .

In order to obtain the desired foliar removal, the application rates are generally from 1 to 10,000 g of mixture / ha, preferably from 10,000 g of mixture / ha.

The application of the preparation can be carried out in the usual manner, e.g. using water as a carrier at spray rates of about 100-1000 l / ha. The use of the preparation by the so-called "Low-volume" or "Ultra-low-volume" method is also possible.

The descaling agents and basic additives of the mixture according to the invention are known per se and can be prepared by methods known per se.

The preparations contain, for example, the following ingredients: 10 a) 95% by weight of a mixture 4% by weight of kaolin 1% by weight of surfactants: sodium salt of N-methyl-N-oleyltaurine and calcium salt of lignin sulphonic acid 15 b) 80% by weight of a mixture 10% by weight of calcium salt of lignin sulphonic acid 3% by weight of ammonium salt of tetraethylene glycolinonylphenyl ether monosulphuric acid ester 7% by weight of colloidal silicic acid 20 c) 20% by weight of a mixture 70% by weight of bentonite 8% by weight of pulp 25 d) 5% by weight of a mixture 80% by weight of bentonite 10% by weight of pulp pitch 5% by weight of a surfactant based on a fatty acid condensation product 30 The product is prepared, for example, by mixing the various ingredients in a mixing drum and then grinding the mixture in a mill.

These preparations can be applied to the treated plants either directly or diluted with water. The pH of the preparations is of particular importance for the potency of the effect of the mixture 9 65531 and should expediently be greater than 8, preferably 9.5-11.5. A particular embodiment of the invention determines the pH.

The following examples are based on plant-5 room experiments performed primarily on cotton seedlings in stages 3-8 of the true leaf. The preparations were used as aqueous products based on the above compositions.

Evaluation of the results of the experiments was performed by counting the number of leaves dropped after the use of the 10-racket and calculating its share as a percentage of the total number of leaves. There were always the same number of magazines for each member of the experiment in separate experiments. From one experiment to another, the number of leaves varied between different members of the experiment, ranging from 20 to 28 leaves per 15 members of the experiment.

The following examples provide information on the active substance, the alkaline reactant, the mixture, the application rate and the percentage of leaf removal obtained. In part, the percentage of leaf removal obtained by combination 20 is shown in parentheses in S.R. Expected additive effect calculated by the Colby method (S.R. Colby, "Calculating Synergistic and Antagonistic Responses of Herbicide Combinations," Weeds 15/1 (1967) pp. 20-22). These calculations were performed as follows:

YY

E = x + Y "IM

where X = A percentage of foliage achieved with A using p kg of active substance / ha 30 Percent of foliage achieved with Y = B using q kg of active substance / ha E = expected foliage with A + B using p + q kg / ha.

35 If the observed value is higher than the value E calculated according to Colby, then the combination has a synergistic effect. The results obtained in the examples clearly show that the basically reactive substances which do not act as such in themselves clearly enhance the effect of the active ingredients used for leaf removal.

Example 1 5 Young cotton seedlings with 5 actual leaves were treated with the following preparation components: active ingredient, alkaline reactants and a mixture thereof (the experiment was repeated 4 times). The amount of water used was 500 1 / ha. After some 10 days, the number of fallen leaves was found in%. The results are shown in the following table:

Components Application rate, Leaf removal, E (according to Colby ___ g / ha __% _) _ 1-phenyl11-3- (1,2,3-80 35. C thiadiazol-5-yl) urea K2CO3 = II 500 0 K4P20? = III 500 0 I + II 80 + 500 70 (35) I + III 80 + 500 60 (35) 20

Example 2

Young cotton seedlings were treated in the same manner as in Example 1. The results are shown in the following table: «k

Components Application rate, Leaf removal, E (according to Colbun _g / ha _% ___) 11 65531 1-phenyl-3- (1,3-ladiazol-80 57 c 5-yl) urinary

substance = I

K2CO3 = II 500 0

Na 2 CO 3 = XV 500 0 (NHJ ^ COo = IV 500 0 K OH * * = V 500 0 10 I + II 80 + 500 70 (57) I + XV 80 + 500 85 (57) I + IV 80 + 500 80 ( 57) I + V 80 + 500 60 (57)

Example 3 15 Young cotton seedlings were treated in the same way as in Example 1. The results are shown in the following table:

Kcnpcnentit Application rate leaf removal, E (Colbun ______ g / ha _% _ lying down) 20 l-phenyl-3- (1,2,3- 40 29

thiadiazol-5-yl) urea = I

Na oleate = VI 500 0

Triethanolamine = VII 500 0 25 Triethylanine = VIII 500 I + VI 40 - 500 33 (29) I + VII 40 - 500 43 (29) I + VIII 40 - 500 62 (29) 30 Example 4

Young cotton seedlings were treated in the same manner as in Example 1. The lower activity percentages obtained compared to the above examples are due to the unfavorable environmental conditions at the time of the experiment, the winter months. The results are shown in the following table: 12 65531,

Components Application rate, Leaf removal, * · _g / ha _% __ 1-phenyl-3- (1,2β-, 80-thiadiazol-4-yl) -urea! = ί 5 ... 500 0 I ^ CO-j ►. = II 1 000 0. I + II 80 t 500 29 5- (phenyl-80'-carbamylylamino) -1 p p-O-thiadiazolin-2-yl, Ca

salt = IX

IX + II 80 + 500 24 1- (2-pyridyl) -3- (1,2,3-thiadiazol-5-yl) urea = x X + II 80 + 500 23.5

Example 5

Young cotton seedlings were treated as in Example 4. The results are shown in the following table:

Components Application rate, Leaf removal, E (according to Colbyn _g / ha_%) 5- (phenylcarbamoyl-500-ylimino) -1,2,3-2 c-thiadiazolin-2-

idi, K-salt IX

K2CO3 = II 500 0 XI + II 500 + 500 39 (17)

Example 6 30 Young hibiscus seedlings, each with 7-10 mature leaves> were treated as in Example 1. 6 days after treatment, the percentage of fallen leaves was determined.

Components Application rate, Leaf removal, E (Colbyn ___________ q / ha __% _ mocha) _ 65531 13 1-phenyl-3- (1,2,3-2,510 thiadiazol-5-yl) - 10 4

urea = I

5 K2CO3 = II 500 0 K, Po0_ = III 500 0 4 2 7 I + II 2, 5 + 500 14 (0) 10 + 500 46 (4) I + III 2 £ + 500 11 (0) 10 10 + 500 54 (4)

Example 7

Young cotton seedlings were treated as in Example 1. The results are shown in the following table:

Kcrponents Application rate, Leaf removal, E (Colbyn 15 _______ q / ha _% _ mocha) 1-phenyl- (1,2,3-thiadiazol-5-yl) urea = I 40 19 K2CO3 = II 3000 0 20 K4P2 ° 7 Sl11 3000 0 I + II 40 + 300 57 (19) 40 +1000 67 (19) 40 +3000 71 (19) 40 + 10000 76 (19) I + III 40+ 1000 62 (19) 25 40 +3000 86 (19) 40 + 10000 90 (19)

Example 8

Young cotton seedlings were treated as in Example 1. The results are shown in the following table:

Components Application rate Leaf removal, E (according to Colbyn _g / ha _% _) 14 65531 1-phenyl- (1,2,3- = I 40 33 thiadiazol-5-yl) - urea K2CO3 = II 540 0

Hexamethylene- = XVI 540 0 tetramine I + II 40 + 500 71 (33) I + XVI 40 + 500 48 (33) 10

Example 9

Young cotton seedlings were treated as in Example 1. The results are shown in the following table:

Components Application rate Leaf removal, E (according to Colbyn 15 _ g / ha _% _) _ 1-phenyl- (1,2, 3- 40 64

thiadiazol-5-yl) urea - I

K2C03 = II 500 0 20 K3PO4 = XVII 500 0 I + II 40+ 500 86 64 I + XVII 40+ 500 91 64

Example 10

Young cotton seedlings were treated as in Example 1. The results are shown in the following table: 15 65531

Kcrrponents Application rate, Leaf removal, E (Colby's ___ g / ha_% germination) 1-phenyl-1-methyl- 40 63

(1,2,3-thiadiazol-5-yl) urea = XII

5 K2CO3 = II 500 0 K., P0. = XVII 500 0 XII + II 40 - 500 71 63 XII + XVII 40 + 500 76 63

Example IL

10 Young cotton seedlings were treated as in Example 1. The results are shown in the following table:

Components Application rate, Leaf removal, E (according to Colbyn __g / ha _% _) 5- (phenylcarbamo- 40 52 15 ylimino) -1,2,3-thiadiazolin-2-yl,

Mg salt = XIII

K3PO4 = XVII 500 0 XIII + XVII 40 + 500 71 52 20 Example 12

Young cotton seedlings were treated as in Example 1. The results are shown in the following table:

Components Application rate Leaf removal, E (according to Colby ___ g / ha _% _) 25 5- (phenylcarbamoylimino) -1,2,3-thiadiazolin-2-yl,

Mn salt = XIV 40 32 Κ-, ΡΟ. = XVII 500 0 XIV + XVII 40 + 500 82 32 30 Example 13

Young Citrus plants with 21-27 leaves were treated as in Example 1. The results are shown in the following table: 16

Components Application rate Leaf removal, _g / ha _% _ 65531 1-phenyl- (1,2,3-300 19

thiadiazol-5-yl) urea = I

5 k2co3 = II 1000 0 I + II 300 + 1000 48

Example 14

Young Urtica urens plants were sprayed with the preparation according to the invention and separately with its separate components. Three weeks after spraying, the fresh weight of aboveground plant parts was determined. The following table shows the relative height and fresh weight values of the plants (untreated = 100). Compared to the untreated control, Kasveil-15a had a more modest, lower, and thus stiffer growth than desired. The experimental results show that the growth control effect of the preparation according to the invention is greater than that of the individual components.

20 Kcnponent Operating Cons- Plant Ratio- Plant Ratio Weight, ppm fresh weight __height_ 1-phenyl- (1,2,3-2 793

thiadiazol-5-yl) urea = I

25 I ^ CO-j = II 26 100 100 I + II 2 + 26 75 131

Claims (18)

65531 Preparation for use in controlling plant growth or in particular for removing leaves from plants, characterized in that it contains a 1,2,3-thiadiazol-5-yl urea derivative or a 1,2,3-thiadiazolin-2-idide derivative in admixture with a basic reactant. Preparation according to Claim 1, characterized in that it contains a 1,2,3-thiadiazol-5-10 urea derivative of the general formula Nc „- H v Λ | l II ί / 1 IN CNC - NV k 15 wherein R 1 is hydrogen or a C 1 -C 6 alkyl group, R 2 is a C 1 -C 5 alkyl group, a C 1 -C 6 acycloalkyl group, phenyl, halophenyl, C 1 -C 4 alkylphenyl, alkoxyphenyl, nitrophenyl or trifluoromethylphenyl group, unsubstituted or pyridyl or pyrimidyl group substituted by mono- or polysubstituted or different C1-C4-alkyl or -C4-alkoxy groups, halogen atoms or nitro or trifluoromethyl groups, or R 1 and R 2 together with the N atom form a morpholino, piperidino or pyrrolidino group, R 3 is hydrogen or a C 1 -C 4 alkyl group, and X is an oxygen or sulfur atom. Preparation according to Claim 1 or 2, characterized in that it contains 1-phenyl-3- (1,2,3-thiadiazol-5-yl) urea, 1-phenyl-1-methyl-3 - ( 1,2,3-thiadiazol-5-yl) urea or 1- (2-pyridyl) -3- (1,2,3-thiadiazol-5-yl) urea. Preparation according to Claim 1, characterized in that it contains a 1,2,3-thiadiazoline-2-idi derivative of the general formula 65531 /, Ν ^ = τ, χ ONC = Ν - C - Ν Β® 11 ^ s R 2 is hydrogen or a C 1 -C 4 alkyl group, R 2 is hydrogen or C 1 -C 6 alkyl, C 1 -C 6 cycloalkyl, phenyl, halophenyl, C 1 -C 4 alkyl an alkylphenyl, C 1 -C 4 alkoxyphenyl, nitrophenyl or trifluoromethylphenyl group, unsubstituted or by one or more identical or different C 1 -C 4 alkyl or C 1 -C 4 alkoxy groups, a halogen atom or a pyridyl or pyrimidyl group substituted by a nitro or trifluoromethyl group, or and R 2 together with the N atom form a morpholino, piperidino-15 or pyrrolidino group, and B is an alkali metal atom, preferably a lithium, sodium or potassium atom, or a corresponding zinc, manganese -, the equivalent of a calcium, magnesium or barium atom, and X is oxygen or sulfur. Preparation according to Claim 1 or 4, characterized in that it contains the calcium salt of 5- (phenylcarbamoylamino) -1,2,3-thiadiazolin-2-yl, 5- (phenylcarbamoylamino) -1 , The magnesium salt of 2,3-thiadiazolin-2-yl or the manganese salt of 5- (phenylcarbamoylamino) -1,2,3-thiadiazolin-2-yl. Preparation according to Claim 1, characterized in that the alkali-reactive substance is an alkali metal hydroxide, amine, carbonate, phosphate or alkali salt of a monocarboxylic acid. Preparation according to Claim 6, characterized in that it contains sodium or potassium hydroxide. Preparation according to Claim 6, characterized in that it contains triethylamine, diethanolamine, triethanolamine, triisopropanolamine or hexamethylenetetramine. 65531 Preparation according to Claim 6, characterized in that it contains sodium carbonate, potassium carbonate or ammonium carbonate. Preparation according to Claim 6, characterized in that it contains trisodium phosphate, tripotassium phosphate, tetrasodium pyrophosphate or tetra-potassium pyrophosphate. Preparation according to Claim 6, characterized in that it contains sodium oleate. Preparation according to Claim 1, characterized in that it contains 1-phenyl-3- (1,2,3-thiadiazol-5-yl) urea in a mixture of potassium hydroxide, potassium carbonate, ammonium carbonate, tetrapotassium pyrophosphate, triethylamine , with triethanolamine or sodium oleate. Preparation according to Claim 1, characterized in that it contains 1- (2-pyridyl) -3- (1,2,3-thiadiazol-5-yl) urea in admixture with potassium carbonate. Preparation according to Claim 1, characterized in that it contains the calcium salt of 5- (phenylcarbamoylamino) -1,2,3-thiadiazolin-2-idide in admixture with potassium carbonate. Preparation according to Claim 1, characterized in that it contains the individual components in a weight ratio of 1 part by weight per leaf removal agent to 0.5 to 1000 parts by weight of the basic reactant. Preparation according to Claim 1, characterized in that it has a pH of more than 8, preferably 9.5 to 11.5. Preparation according to Claim 1, characterized in that it consists of 5 to 95% by weight of a thiadiazol-5-yl urea substance or a 1,2,3-thiadiazolin-2-iodine derivative in a mixture with a basic reactant. with 95-5% by weight of liquid or solid carriers and optionally up to 30% by weight of surfactants. 65531 Use of a preparation according to claim 1 for removing leaves from cotton plants. Patentkrav, r _. 65531