NL8104620A - Means for the defoliation and growth regulation of plants. - Google Patents

Description

•. -1-% - vo 2326

Agent for defoliation and growth regulation of plants

The invention relates to a defoliation agent. growth regulation of plants. In particular, the invention relates to a plant defoliating agent, preferably cotton plants, wherein the agent comprises mixtures of 1,2,3-5 thiadiazol-5-ylurea or 1,2,3-thiadiazoline-2-ide derivatives containing basic reacting substances.

1,2,3-thiadiazol-5-ylurea and 1,2,3-thiadiazoline-2-ide derivatives are already known as plant defoliating agents (German Offenlegungsschriften 2,506.69O; 2,619 * 861; and 10 2 .Τ19 · 810) · However, these active compounds do not show sufficient activity in all cases.

In addition, mixtures of 1,2,3-thiadiazol-5-yl-urea derivatives with other defoliators are known, in which the substances which in each case already act to a greater or lesser degree in defoliation reinforce each other in terms of their effect (German Offenlegungssehrift 2.6 ^ 6.712) The synergistic effect of these mixtures is therefore dependent on two already active compounds.

The object of the present invention is therefore to provide an agent, in particular for defoliating plants, in which the action of the 1,2,3-thiadiazol-5-yl-urea or 1,2,3 known as active , 3-thiadiazoline-2-ide derivatives is increased by the addition of substances which are not active per se.

This problem is solved according to the invention by means of an agent, characterized in that it explores a defoliated 1,2,3-thiadiazol-5-yl-urea or 1,2,3-thiaziazoline-2-ide- derivative, mixed with a basic reacting agent.

The defoliating compounds of the invention include: A) 1,2,3-thiadiazol-5-yl-urea derivatives of general formula 1, wherein R is hydrogen or a C 1 -C 8 alkyl group, R 1 is a C.-C_- 1 1? 2 1 5 alkyl group, a C 1 -C 8 cycloalkyl group, a phenyl, halophenyl, G 1 -C 2 alkylphenyl, C 1 -C 2 alkoxyphenyl, nitrophenyl or trifluoromethyl-phenyl group, an unsubstituted or a single or multiple 8104620 mm * -> »« II Μ * ιι ·> · Τ · .ι I 'ini' I HI <* - ι · ι · I i. w.i ........

f Ί; -2- »mutually identical or different by C 1 -C 2 -alkyl groups, C 1 -C 2 -alkoxy groups, halogen atoms, a nitro group or a trifluoromethyl group substituted pyridyl or pyrimidyl group or R 1 and R 8 together with the H atom to which they are attached represent a morpholino, piperidino or pyrrolidino group, R 1 hydrogen or a C 1 -G 2 alkyl group and X represent an oxygen or sulfur atom; B) 1,2,3-thiadiazoline-2-ide derivatives of the general formula 2, wherein R 1 hydrogen or a C 1 -C 2 alkyl group, R 2 hydrogen or a C 1 -C 2 alkyl group, a C -C 8 -cycloalkyl group, a phenyl, halo-phenyl, C 1 -C 7 -alkylphenyl, -C 1 -alkoxyphenyl, nitrophenyl or trifluoromethylphenyl group, an unsubstituted or single or multiple mutually identical or different by C 1 -C 2 -alkyl groups, C 1 "C 2 -alkoxy groups, halogen atoms, a nitro group or a trifluoromethyl group substituted pyridyl or pyrimidyl group or R 1 and R 8 together with the nitrogen atom to which they are attached, a morpholino, piperidino or pyrrolidino group and B represents an alkali metal atom, preferably a lithium, sodium or potassium atom, or a corresponding equivalent of a zinc, manganese, calcium, magnesium or barium atom and X represents oxygen or sulfur.

As compounds of the general formula 1 can be mentioned for example: 1-phenyl-3- (1,2,3-thiadiazol-5-yl) -urea 1-phenyl-1-methyl-3- (1,2,3 -thiadiazol-5-yl) -urea chlorophenyl) -3- (1,2,3-thiadiazol-5-yl) -urea 1-cyclohexyl-3- (1,2,3-thiadiazol-5-yl) - urea 1- (3-chlorophenyl) -3- (1,2,3-thiadiazol-5-yl) urea 1- (U-methylphenyl) -3- (1,2,3-thiadiazol-5-yl) - urea 1- (3-methylphenyl) -3- (1,2,3-thiadiazol-5-yl) urea 1- (3, + + 011 chlorophenyl) -3- (1,2,3-thiadiazole- 5-yl) urea 1-methyl-3- (1,2,3-thi adiazol-5-yl) urea 1,1-dimethyl-3- (1,2,3-thiadiazol-5-yl) urea 1.1 - dimethyl-3-methyl-3- (1,2,3-thiadiazol-5-yl) urea 1-methyl-3-methyl-3- (1,2,3-thiadiazol-5-yl) urea 1 -pheny1-3- (1,2,3-thiadiazol-5-yl) -thiourea 1- (U-chlorophenyl) -3- (1,2,3-thiadiazol-5-yl) thiourea T- (2-pyridyl ) -3- (1,2,3-thiadiazol-5-yl) urea T- (5-chloro-2-pyridyl) -3- (1,2,3-thiadiazol-5-yl) urea 8104820_ £ * -3- "l". ,. ... r - - -.

1- (H-methyl-2-pyridyl) -3- (1,2,3-thiadiazol-5-yl) urea.

1 - (U-methyl-2-pyrimidyl) -3- (1,2,3-thiadiazol-5-yl) urea 1 - (it-pyridyl) -3- (1,2,3-thiadiazole-5- yl) urea 1 - (3-pyridyl) -3- (1,2,3-thiadiazol-5-yl) urea 5 1- (2-pyrimidyl) -3- (1,2,3-thiadiazole-5 -yl) urea 1 - (3-methyl-2-pyridyl) -3- (1,2,3-thiadiazol-5-yl) 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

As compounds of general formula 2, "example 10 may be mentioned:

5- (phenylcarbamoylimino) -1,2,3-thiadiazoline-2-ide, sodium salt.HgO

5- (phenylcarbamoylimino) -1,2,3-thiadiazoline-2-ide, calcium salt. ÖÏÏ ^ Q

5- (phenylcarbamoy] imino) -1,2,3-thiadiazoline-2-ide, potassium salt .H ^ O

5- (phenylcarbamoylimino) -1,2'-3-thiadiazoline-2-ide, sodium salt. te ^ O 15 5- (methylphenylcarbamoylimino) -1,2,3-thi adi azoline-2-i, sodium salt .H ^ O

5- (methylphenylcarbamoylimino) -1,2,3-thiadiazoline-2-ide, potassium salt. H ^ O

5- (methylphenylcarbamoylimino) -1,2,3-thiadiazoline-2-ide, lithium salt.H ^ O

5- (2-pyridylcarbamoylimino) -1,2,3-thiadi azoline-2-ide, sodium salt. 1.5 H ^ O

5- (2-Pyridylcarbamoylimino) -1,2,3-thiadiazoline-2-ide, potassium salt. H ^ O 20 5- (2-Pyridylearbamoylimino) -1,2,3-thiadiazoline-2-ide, lithium salt. O

5- (phenylthiocarbamoylimino) -1,2,3-thiadiazoline-2-th, sodium salt.

5- (phenylcarbamoylimino) -1,2,3-thiadiazoline-2-ide, magnesium salt. 2H20 5- (phenylcarbamoylimino) -1,2,3-thiadiazoline-2-ide, zinc salt. 3H20 5- (phenylcarbamoylimino) -1 , 2,3-thiadiazoline-2-ide, manganese salt. 3Hg0 25 5- (phenylcarbamoylimino) -1,2,3-thiadiazoline-2-ide, barium salt. 33 ^ 0

The following are particularly suitable according to the invention of these substances: 1-phenyl-3- (1,2,3-thiadiazol-5-yl) -urea 1- (2-pyridyl) -3- (1,2,3- thiadiazol-5-yl) urea 5- (phenylcarbamoylimino) -1,2,3-thiadiazoline-2-ide salts.

The following can be mentioned as per se non-adherent basic reacting substances according to the invention: alkali hydroxides, for example sodium and potassium hydroxide; amines, such as alkylamines, for example triethylamine, alkanolamines, for example diethanolamine, triethanolamine and triisopropanolamine, hexamethylene tetramine; carbonates, such as sodium carbonate, potassium carbonate, ammonium- 8104620 "9 9> Γ_τ_ x” ............ ................. "... .. "............... '. 1.

carbonate; phosphates, such as tertiary phosphates, for example, trisodium phosphate, tripotassium phosphate, pyrophosphates, such as tetrasodium pyrophosphate or tetrapotassium pyrophosphate; Monocarboxylic acid alkali salts, such as sodium oleate.

Preferably, such compounds should be used for this purpose, whereby the agents according to the invention are set to a: ρΞ value of more than 8, preferably of 9.5-11.5.

The agent of the invention surprisingly exhibits an activity greater than that of the individual components.

. It is therefore particularly suitable for defoliating cotton plants, ideally allowing the use of plucking machines for the haircut harvest.

However, other plants can also advantageously defoliate or be affected in their growth, such as, for example, in the promotion of sedimentation ("Bestockung"), the formation of lateral shoots, the inhibition of root growth in grasses and dicots, such as Hibiscus, apples and other shrubs. It will be clear that the agent according to the invention can therefore advantageously be used both for defoliation and for the regulation of plant growth.

It is known that defoliation is not a herbicidal action and that even dying of the treated plants is undesirable because the leaves remain attached to the dead plants and the productive plant parts may be damaged. The purpose of defoliation to make harvesting easier and purer crop may be lost.

It is therefore imperative that the plant survive while the leaves are separated and fall off. This allows the further development of the productive plant parts, whereby the growth of new young leaves should be prevented. All these problems are solved excellently by means of the invention, so that it can be assumed that the results of the prior art are far surpassed.

The agent according to the invention can also be mixed in a mixture with other active substances, for example defoliators, plant protection agents or to combat harmful organisms, depending on the desired purpose.

Moreover, a promotion of the activity and the speed of action can be achieved, for example, by additives which increase the effect, such as organic solvents, wetting agents and oils. As a result, a further reduction of the amount of the actual active substances used can be achieved. are allowed.

It is recommended that the mixture according to the invention be in the form of preparations, such as powders, spreading agents, solutions, emulsions or suspensions, with the addition of liquid and / or solid carriers or diluents and, if desired, of wetting, bonding, emulsifying and / or to use dispersants as auxiliary agents.

Suitable liquid carriers are, for example, water, aliphatic and aromatic hydrocarbons, such as benzene, toluene, xylene, cyclohexanone, isophorone, dimethyl sulfoxide, dimethyl formamide and further fractions of mineral oils.

Solid carriers are suitable mineral earths, for example tonsil, silica gel, talc, kaolin, attaclay, limestone, silica and vegetable products, for example flours.

As surface active compounds, mention may be made, for example, of sodium or calcium lignin sulfonate, polyoxyethylene alkyl phenyl ethers, naphthalene sulfonic acids and their salts, phenol sulfonic acids and their salts, formaldehyde condensation products, fatty alcohol sulfates, long chain fatty acid salts, and substituted salts of benzene sulfonic acids. thereof.

The content of the indicated mixture in the different preparations can vary within wide limits. For example, the agents contain about 5-95% by weight of this mixture, about 95-5% by weight of liquid or solid carriers, and optionally at most 30% by weight of surfactants.

The weight ratio of the components in the indicated mixture should be about 1 wt. dl of the defoliating compound to amount to 0.5-1000 parts by weight of the non-active basic substance and focuses on the sensitivity and resilience of the plants, the time of application, the climatic conditions and the soil conditions .

The amounts to be used are as a rule 1-10,000 g mixture / ha, preferably 10-1000 g mixture / ha, for the desired defoliation.

The application of the mixture can take place in the usual manner, for example, with water as a carrier, to be sprayed in amounts of about 100-1000 liters / ha. Application of the agent using the so-called "low volume" or "ultra-lcw volume" method is also possible.

The defoliating compounds and the basic additives of the indicated mixture are known per se and can be prepared by methods known per se.

For example, the following ingredients are used to prepare the compositions: a) 95 wt.% Mixture 4 wt. # Kaolin 15 1 wt. # Surfactants based on.

the sodium salt of N-methyl-N-oleyl-taurine and the calcium salt of lignin sulfonic acid.

b} 80 wt.% mixture. 10 wt. # calcium salt of lignin sulfonic acid 20 3 wt. # ammonium salt of the mono sulfuric acid ester of tetraethylene glycol nonyl phenyl ether 7 wt.% colloidal silicic acid.

c) 20 wt. # mixture, · 70 wt. # tonsil 25 8 wt.% sulphite eye pitch ("Self Breakdown") 2 wt. # humectant based on a fatty acid condensation product.

d) 5% by weight mixture 80% by weight tonsil 10% by weight sulphite lye pitch ("Self Breakdown") 5% by weight wetting agent based on a fatty acid condensation product.

The preparations are prepared, for example, by mixing the individual constituents in a drum and 8104620 »r <·» -T-.

then ground in a mill.

These preparations can be applied to the plants to be treated either directly or after diluting with water.

The pH value of these preparations is of particular significance for the enhancement of the activity and should preferably be more than 8, preferably 9S5 or 11.5. This provides a special embodiment of the invention.

; The following examples are based on tests in one; greenhouse, which tests are usually carried out with cotton plants • 10 with 5-8 true leaves. The treatment agents were used in the form of aqueous preparations based on the above compositions.

The tests were assessed by counting the sheets shed since use and calculating the percentage of the total number of sheets. The same number of sheets was always available in the individual test per section.

From trial to trial, the number of leaves per trial section varied between 20 and 28 foliage leaves per trial section.

The examples below contain indications concerning the active compound, the basic reacting agent, the mixture, the amount used, and the percentage defoliation determined. In part, after the percentage of defoliation obtained by the combination is indicated in brackets the - according to the by S.H. Colby described method - calculated value, which would be expected at the occurrence of additive action (S.R. Colby "Calculating Synergistic and Antagonistic Responses of Herhicide Combinations" in Weeds 15/1 (196, p. 20-22).

The calculation was made using the following formula: 30 e = x + _ _ L, where X = percentage defoliation with substance A at p kg active compound / ha X = percentage defoliation with substance B at q. kg active compound / ha E = expected defoliation by A + B at p + q. kg / ha.

When the observed value is greater than the according to Colby 8104620

• i V

'π7: ...............: ......: ........................ .. 'ι "calculated value Ε, then the combination has a synergistic effect.

The results of these examples clearly demonstrate the enhancement of the activity of the defoliating agent by the ineffective basic reactants.

Example I

Young cotton plants in the stage of 5 foliage leaves were planted with the. components indicated by the active compound, the basic reacting substance and the mixture thereof, are indicated in the table (fourfold repetition). The amount of water used was 500 liters / ha. After a few days the percentage of shed sheets was determined. The results are summarized in the table below.

Components Applied How- Defoliation E (by multiplicity in% Colby) • 15 _; _ in g / ha _; _ · 1-phenyl-3- (1,2,3-thia-diazol-5-yl) -urea = I 80 35 K2C03 = II 500 0 Κ ^ Ρ207 = III 500 0 20 I + II 80 + 500 TO (35) I + III 80 + 500 60 (35)

Example II

Young cotton plants were treated as described in Example I. The results are summarized in the table below.

8104620 +% '' -9-

Camponents Applied - Defoliation E (according to amount in% Colby_in g / ha ______ 1-phenyl-3- (1,2,3-ihiadia-5-sol-5-yl) -urea = I 80 57 k2co3 = II 500 0 'lTa2CO3 = XV 500 0 (νη ^) 2οο3 = IV 500 è 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 III

Young cotton plants were treated as described in Example I. The results are summarized in the following table:

Components Applied Defoliation E (by amount in% Colby) in g / ha _______ 20 1-phenyl-3- (1,2,3-thiadi-azol-5-yl) -urea «I kO 29

Ba-01eaate = VI 500 0

Triethanolamine = VII 500 0

Triethylamine = VIII 500 25 I + VI U0 + 500 33 (29) I + VII kQ + 500 k3 (29) I + VIII 1 * 0 + 500 62 (29)

Example IV

Young cotton plants were treated as described in Example I. The lower operating percentages compared to the examples mentioned above must be attributed to unfavorable environmental conditions during the test run in the winter months. The results are summarized in the following table: 8104620 ______ «*, -10-

Components Applied Defoliation - amount in% _in g / ha_ 1-phenyl-3- (1,2,3-thiadiazol-5-yl) -urea = »I 80 0 K CO * II 500 · 0. J 1000 0 I + II 80 + 500 29 5- (phenylcarbamoyl; 10 irinino) - 2,3-thiadiazoline-2-ide,

Calcium salt - IX

IX + II 80 + 500 2k 1- (2-pyridyl) -3-15 (1,2,3-thiadiazol-5-yl) urea = X * X + II 80 + 500 23.5%

Example V

Young cotton plants were treated in the manner indicated in Example IV. The results are summarized in the table below.

Components Applied Defoliation E (by amount in% Colby) ......: _ in g / ha ___ 5-ifenylcarbamoylimino) -25 1,2,3-thiadiazoline-2-ide, potassium salt XI500 17 K2CO3 = II 500 0 XI + II 500 + 500 39 (17)

Example VI

Young Hibiscus plants with 7-10 developed leaves each were treated in the manner indicated in Example I. Six days after treatment, the percentage of sheets dropped was determined.

The results are shown in the table below.

8104620

# V

-11-

Components. Defoliation used E (according to amount in% Colby) in g / ha _. 1-phenyl-3- (1,2,3-thiadia-2,5 O 5 sole-5-yl) -urea = I 10. 1+ K ^ C03 = II 500 0. Κ ^ ρ2ο7 = III 500 0 I + II 2.5 + 500 1¼. (0) 10 + 500 1 + 6 (10 in I + III 2.5 + 500 11 (0) 10 10 + 500. (¾)

Example VII

Young cotton plants were treated in the manner indicated in Example 1. The results are summarized in the following table.

1C. Components Applied Defoliation E (according to '5 amount in% Colby) _in g / ha ______ 1-phenyl- (1,2,3-thiadiazol-5-yl) -urea = I 1 + 0 19 K ^ C03 - II 3000 0 20 K ^ PgO ^ = III 3000 0 I + II. 1 + 0 + 300 57 (19) 1 + 0 + 1000 6j (19) l + o + 3000 71 (19) l + o + 10000 76 (19) 25 I + III 1 + 0 + 1000 62 (19) 1 +0 + 3000 86 (19) l + o + 10000 90 (19)

Example VIII

Young cotton plants were treated as described in Example I. The results are summarized in the table below.

8104620 \ 0 ** t.

—12-

Components Applied Defoliation E (by amount. In% Colby) _in g / ha 1-phenyl- (1,2,3-thiadiazol-5-yl) urea = 1.1 * 0 '33

KgCO3 = II, 5 ^ 0 0 • Hexamethylenetetramine = XVI - 5k0 0 I + .II 1 * 0 + 500 T1 (33) I + XVI. ij-0 + 500 U8 (33)

Example IX

Young cotton plants were treated as described in Example I. The results are summarized in the following table.

t * »

Components Applied Defoliation E (by amount in% Cölby) ____in g / ha _ 1-phenyl- (1,2,3-thiadiazol-5-yl) -urea = I 1 * 0 6k k2co3 * II 500 0 Κ3Ρ0 ^ = XVII 500 o.

I + II 1 * 0 + 500 86 6k I + XVII 1 * 0 + 500 91 61 *

Example X.

Young cotton plants were treated as described in Example I. The results are shown in the following table.

Components Applied Defoliation E (by amount in% Colby) _in g / ha_ 1-phenyl-1-methyl- (1,2,3-thiadiazol-5-yl) -urea = XII 1 * 0 63 k2co3 = II 500 0 K ^ PO ^ XVII 500 0 XII + II 1 * 0 + 500 63 XII + XVII 1 * 0 + 500 63 8 104 620% -13-

Example XI

Young cotton plants were treated as described in Example I. The results are summarized in the table below.

Components Applied Defoliation E (according to 5 ·· quantity in% Colby) _in g / ha_ 5-phenylcarbamoylimino- (1,2,3-thiadiazoline-2-ide9 magnesium salt = XIII 1 * 0 52.

K ^ PO ^ = XVII 500 0 10 XIII + XVII kO + 500 71 52

Example XII

Young cotton plants were treated as described in Example I. The results are summarized in the following table.

15 Components Applied Defoliation E (by amount in% Colby) in g / ha_ 5-phenylcarbamoylimino-1,2j 3-thiadiazoline-2-ide 20 magnesium salt = XIV U0 32 K ^ PO ^ = XVII 500 0 XIV + XVII kO + 500 82 32

Example XIII

Young citrus plants with 21-27 leaves were treated in the manner indicated in Example I25. The results are shown in the table below.

8104620; . -H- 'Components Applied Defoliation amount in% - * in g / ha_'-1-phenyl- (1,2,3-thiadiar 5-sol-5-yl) -urea = I 300 19

KgCO - II 1000 o

I + II 300 + 1000 bQ

Example XIV

. Young plants of Urtica ttrens were treated with the agent according to the invention, respectively. sprayed with the individual components thereof. Three weeks later, the fresh weight of the plant parts protruding above the earth was determined. The table below shows the relative values for the height of the plant and the fresh weight (untreated = 100). The plants showed the desired, more stocky, lower and therefore more stable growth relative to the untreated control. Nevertheless, the fresh weight was greater.

The results of the test show that the agent according to the invention produces a stronger growth regulating effect than the individual components.

20 Components Applied? Relative Relative fresh concentration height by weight in ppm plant 1-phenyl- (1,2,3-thiadiol-5-yl) -urea = I 2 79 113 25 -Kg CO2 = H 26 100 100 I + II 2 + 26 75 131 8104620

Claims (14)

Agent for treating plants, in particular for defoliating plants, characterized in that these agents have a 1,2,3-thiadiazol-5-ylurea or 1,2,3-thiadiazoline-2- * ide derivative, mixed with a basic reacting agent. Agent according to claim 1, characterized in that the agent contains a 1,2,3-thiadiazol-5-yl-urea derivative of the formula 1, containing: R 1 hydrogen or a C 1 -C 2 -alkyl group, R a C 1 -C 2 -alkyl group, a C 1 -C 2 cycloalkyl group, a phenyl, halophenyl, C 1 -C 2 -alkylphenyl, C 1 -C 2 -alkoxyphenyl, nitrophenyl-10 or trifluoromethyl group, a non -substituted or a multiple mutually equal or different by C 1 -C 2 -alkyl groups, C 1 -C 2 -alkoxy groups, halogen atoms, a nitro group or a trifluoromethyl group substituted pyridyl or pyrimidyl group or and Rg together with the nitrogen atom to which they are 15, a morpholino, piperidino or pyrrolidino group, R 2 hydrogen or a C 1 -C 20 alkyl group and * X represent an oxygen or zvav atom. Agent according to claim 1 or 2, characterized in that the agent 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. U. Agent according to claim 1, characterized in that the agent contains a 1: 2,3-thiadiazoline-2-ide derivative of the general formula 2, in which formula: R 1 hydrogen or a C 1 -C 6 alkyl group, Rg hydrogen or a C 1 -C 2 alkyl group, a C 1 -C 8 cycloalkyl group, a phenyl, halophenyl, -C 1 -alkylphenyl, C 1 -C 2 -alkoxyphenyl, nitrophenyl or trifluoromethylphenyl group , an unsubstituted or a singly or multiple mutually the same or different by C 1 -C 2 -alkyl groups, C 1 -C 2 -alkoxy greens, halogen atoms, a nitro group or a trifluoromethyl group substituted pyridyl or pyrimidyl group or R 1 and R 9 together with the nitrogen atom to which they are attached represent a morpholino, piperidino or pyrrolidino group 8104320 -16- ". and B an alkali metal atom, preferably a lithium, sodium or potassium atom or a corresponding equivalent of a zinc, manganese -, calcium, magnesium or barium atom and X represents oxygen or sulfur. Agent according to claim 1 and characterized in that the agent 5- (phenylcarbamoylimino) -1,2,3-thiadiazoline-2-ide calcium salt, 5- (phenylcarbamoylimino) -1,2,3-thiadiazoline -2-ide magnesium salt or * 5- (phenylcarbamoylimino) -1,2,3 <rthiadiazoline-2-ide manganese salt. 6. Agent according to any one of claims 1-5, characterized in that the agent as basic reacting compound contains an alkali metal hydroxide, amine, carbonate, phosphate or monocarboxylic acid alkali salt. The agent according to claim 6, characterized in that the agent contains sodium or potassium hydroxide. 8. Agent according to claim 6, characterized in that the agent contains: triethylamine, diethanolamine, triethanolamine, triisopropanolamine or hexamethylene tetramine. Agent according to claim 6, characterized in that the agent contains sodium carbonate, potassium carbonate or ammonium carbonate. 10. Agent according to claim 6, characterized in that the agent contains trisodium phosphate, tripotassium phosphate, tetrasodium pyrophosphate or tetra-potassium pyrophosphate. Agent according to claim 6, characterized in that the agent contains sodium oleate. 12. Agent according to any one of claims 1-3 and 6-11, characterized in that the agent 1-phenyl-3- (1,2,3-thiadiazol-5-yl) -urea, mixed with potassium hydroxide, potassium carbonate , ammonium carbonate, tetrapotassium pyrophosphate, triethylamine, triethanolamine or sodium oleate. 13. Agent according to any one of claims 1-3, 6 and 9, characterized in that the agent contains 1- (2-pyridyl) -3- (1,2,3-thiadiazol-5-yl) -urea, 30 mixed with potassium carbonate. I. Agent according to any one of claims 1, b-6 and 9, characterized in that the agent contains 5- (phenylcarbamoylimino) -1,2,3-thiadiazoline-2-ide calcium salt mixed with potassium carbonate. Agent according to any one of the preceding claims, characterized in that the agent comprises the individual components in a weight ratio of 1 wt. part of the defoliating agent contains 0.5-1000 parts by weight of the basic reacting compound. 8104620 -17- * Agent according to any one of the preceding claims, characterized in that the agent has a pH value "which is greater than 8 and preferably 9.5-11.5. 17. Agent according to any one of the preceding claims, characterized in that the agent consists of 5-95% of the thiadiazol-5-yl-urea. or 1,2,3-thiadiazoline-2-ide derivative, mixed with a basic reacting agent; 95-5 S / S of a liquid or solid carrier; as well as, if desired, up to 30% by weight of a surfactant. 18. Agent according to any one of the preceding claims, for defolating cotton sheets. 8104620 «S '·· ..¾. N - C-H χ 1. ii / R1 Κ Λ — n-c-n; s \ «3 R2 2 © n _ == c_h I /" I ". , I ΝΗλ X 2 Schering Aktiengesellschaft