DE2219922A1 - METHOD OF CONTROL OF UNWANTED PLANTS - Google Patents

Description

Our sign." O.Z. 29 IJO Sws / Wil 6700 Ludwigshafen, April 19, 1972

The present invention relates to a method for controlling undesirable plants in important agricultural crops by treating the soil before the appearance of the plants and a treatment of the plants after they appear on the surface of the soil.

It is known that substituted thiocarbamates or biscarbamates have a herbicidal effect. However, their effect is poor.

A method for controlling unwanted plants has now been found, whereby one takes place before the appearance of the unwanted plants on the surface of the earth the soil in which the growth of undesirable Plants should be prevented from using

a) a compound of the formula

¹ ^ N - CO - S - R ₃ R ₂

in which R ^ is a cyclohexyl radical or a bicyclo or tri-cycloalkyl radical with up to 10 carbon atoms, R _{2 is} a lower alkyl or alkynyl radical with up to 4 carbon atoms and R is a lower alkyl radical with up to 4 carbon atoms mean or

b) l-phenyl-4-amino-5-chloropyridazon- (6) or

c) a compound of the formula

¹ CH ₃ OC ₂ H ₅

and after the appearance of the unwanted plants on the surface of the earth, the useful plants and the unwanted plants

72/72 309844/1110 -2-

ORlQlMAL INSPECTED

with
d) a compound of the formula

/ Vnh-co-0

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x NH-CO-O-CH ₃

in which X is the methyl radical, and / or

e) l-phenyl-4-amino-5-chloropyridazon- (6) nimble

This process destroys the unwanted plants, while the crops grow without damage. The method is therefore particularly suitable for combating undesirable substances Plants in crops of useful plants (rice, peanut, cotton, corn).

The active ingredients are particularly effective against dicot seed weeds and monocot seed weeds. They are therefore suitable for combating unwanted plants in beet crops, Spinach, potatoes, peas, beans or peanuts.

The active ingredients a), b), c) or e) are used in amounts of 1 to 5 kg / ha, preferably in amounts of 2 to 4 kg / ha, and the Active ingredients d) used in amounts of 1 to 5 kg / ha, preferably 1.5 kg / ha.

The active ingredients a), b) or c) are used in the period shortly before the sowing of the crop plants or the planting of the crop plants and the appearance of the undesired plants on the surface of the earth. So they are applied to the ground before the seedlings of the unwanted plants have penetrated the surface of the earth (pre-emergence). The active ingredients can be applied evenly to the soil or incorporated into the top layer of soil and evenly distributed in it.

The active ingredients d) and / or e) are applied after the

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Seedlings of the unwanted plants pierce the surface of the earth to have. The seedlings then form leaves (cotyledons and true leaves), from which the active ingredients c) or e) are absorbed. The active ingredients c) or e) are gMchlich, for example in the form of an aqueous spray mixture, which contains the active ingredient dissolved or as a suspension, on the leaves of the Plants (useful plants and unwanted plants) distributed (Post-emergence).

The active ingredients can be used as solutions, emulsions, suspensions, Granules or dusts are used. The application " Shapes depend entirely on the intended use they should ensure a fine distribution of the active substance in each pail.

For the preparation of directly sprayable solutions, the solution in water comes into consideration. But it can also hydrocarbons with boiling points higher than 150 ⁰ C, z. B. tetrahydronaphthalene or alkylated naphthalenes, or organic liquids with boiling points higher than 150 ⁰ C and .one or more functional groups, z. B. the keto group, the ether group, the ester group or the amide group, this group being a substituent on a hydrocarbon chain or being part of a heterocyclic ring, as spray liquids ·. ■ be used.

Aqueous use forms can be prepared from emulsion concentrates, pastes or usable powders (wettable powders) by adding Water to be prepared. To produce emulsions, the substances can be used as such or dissolved in a solvent, by means of wetting or dispersing agents, e.g. B. Polyäthylenoxidadditionsprodukte.n be homogenized in water or organic solvents. But it can also consist of active substances, Emulsifying or dispersing agents and possibly solvent-based concentrates are prepared for dilution with Water are suitable.

Granules are obtained by applying them to solid carriers.

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Dusts can be produced by mixing or grinding together the active substances with a solid carrier, e.g. B. kieselguhr, talc, clay or fertilizers can be produced.

The active ingredients can be mixed with fertilizers, insecticides, fungicides or other herbicides.

example 1

An agricultural area was sown with the seeds of various plants. Treatment with the active ingredients

0.3 kg / ha of active substance

II N-I- or -2-bicyclo- (3,3,0) -octyl-N-ethyl-ethylthiol-carbamate, 0.4 kg / ha of active substance

III N-ethyl-N-cyclohexyl-thiolcarbamic acid ethyl ester, 0.6 kg / ha of active substance

IV ^ -Methoxycarbönylamimphenyl-N-i ^ '- methyl-phenyl-carbamate, 0.4 kg / ha of active substance

V Phenyl-4-amine-5-chloropyridazon- (6), 0.5 kg / ha active substance

V + IV 0.25 + 0.25 kg / ha of active substance

was done as follows:

A Treatment with the active ingredients I, II, III, IV, V and V + IV before sowing

B Treatment with the active ingredients I, II, III, IV, V and V + IV after the emergence of the weeds and cultivated plants

C Treatment with the active ingredients I, II, III and V

before sowing and additional treatment with the active ingredients IV, V and V + IV after emergence of the weeds and crops.

The table below shows that the treatment method C has a better herbicidal effect compared to treatment methods A and B with the same tolerance to the Crops showed.

309844/1110

Tabel

Treatment method A Active ingredient I. II III IV V V + IV kg / ha of active substance 0.3 0.4 0.6 ' 0.4 0.5 0.25 + 0.25 Groove zpf1anzeη: Beta vulgaris var. Crassa 0 0 0 0 0 0 Beta vulgaris var. Altissima 0 0 0 0 0 0 unwanted plants; Sinapis arvensis 3 2 2 0 20th 30th Chenopodium album 5 2 2 0 30th 40. poa annua 18th 16 17th 0 3 13th Alopecurus myosuroides 17th 15th 17th 0 2 12th Avena fatua 13th 13th 14th 0 2 13th

0 = no damage 100 = total damage

Treatment method B

Active ingredient I. II III IV V V + IV kg / ha of active substance 0.3 0.4 ο, β 0.4 0.5 0.25 + 0.25 Useful plants: Beta vulgaris var. Crassa 0 0 0 0 0 0 Beta vulgaris var. Altissima 0 0 2 0 0 0 unwanted plants; Sinapis arvensis 0 0 2 50 30th 55 Chenopodium album 0 0 2 40 40 60 Poa annua 8th 6th 9 2 6th 15th Alopecurus myosuroides 8th 6th 9 2 5 12th Avena fatua 7th 5 6th 2 5 10

0 = no damage 100 = total damage

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Treatment method C

Active ingredient
kg / ha of active substance I + IV
0.3 + 0.4 I + V
0.3 + 0.5 I + V + IV
0.3 + 0.25 + 0.25 II + IV
0.4 + 0.4 II + V
0.4 + 0.5 II + V + IV
0.4 + 0.25 + 0.25 I.
ΟΛ Useful plants: I. Beta vulgaris var. Crassa 0 0 0 0 0 0 Beta vulgaris var. Altissima 0 0 0 0 0 0 K? unwanted plants: N) Sinapis arvensis 70 70 80 60 65 77 9922 co
O Chenopodium album 60 70 80 50 55 75 co
cn Poa annua 60 65 70 40 45 50 4? » Alopecurus myosuroides 50 50 55 45 48 50 ■ Ο · Avena fatua 45 50 48 43 45 47 · O = without damage ^ 10O = total damage

Treatment method C

Active ingredient

kg / ha of active substance

III + IV III + V III + V + IV V + IV V + V V + V + IV 0.6 + 0.4 0.6 + 0.5 0.6 + 0.25 + 0.25 0.5 + 0.4 0.5 + 0.5 0.5 + 0.25 + 0.25

O
CD
OO

Crops;

Beta vulgaris var. Crassa Beta vulgaris var. Altissima

unwanted plants; Sinapis arvensis Chenopodium album Poa annua

Alopecurus myosuroides Avena fatua

O 0 0 0 · 0 0 O 0 Ό X) 0 0 6ο 65 75 80 80 90 55 58 78 83 '85 100 55 57 45 50 55 53 55 60 40 47 45 50 53 58 40 45 48

0 = no damage 100 = total damage.

K)

CD CD ro K)

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Example 2

An agricultural area was made with the seeds of various Plants sown. Treatment with the active ingredients

I 2-ethoxy-2 _i 3-dihydro-5 _J ^ -dimethyl-5-benzofuranyl methanesulphonate, 0.5 kg / ha active substance

II 3-methoxycarbonylaminophenyl-N- (3'-methyl-phenyl) -carbamate, 0.4 kg / ha of active substance

III l-phenyl-4-amino-5-chloropyridazon- (6), 0.5 kg / ha of active substance

II + III 0.25 + 0.25 kg / ha of active substance

was done as follows;

A Treatment with the active ingredients i, II, III and II + III

before the seed
B Treatment with the active ingredients I, II, III and II + III

after the emergence of the weeds C treatment with the active ingredient I.

before sowing and additional treatment with the active ingredients

II, III, II + III after weeds emerge.

The table below shows that the treatment method C compared to treatment methods A and B, better tolerance to the crop plants and better showed herbicidal effects.

The test result can be seen from the following table:

Tabe Hey

Treatment method A and B

Treatment method
Active ingredient
kg / ha of active substance A.
I.
0, 5 II
0.4 III
0.5 II + III
0.25 + 0.25 B.
I.
o, 5 II
0.4 III
0.5 II + III
8th; ! § ♦ Useful plants:
Beta vulgaris 2, 5 0 0 0 4th 0 0 0

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A.
I.
0.5 9 - III
0.5 II + III
0.25 + 0.25 40 O ₀ Line 29 130
2219922 III II + III
0.5 0.25+
0.25 Treatment method
Active ingredient
kg / ha of active substance II
0.4 • - 30th B.
I.
0.5 II
0.4 unwanted plants: 3 30th 12th 40 60 Chenopodium album 4th 0 20th 13th 10 4o 30 55 Sinapls arvensls 17th 0 2 12th 50 5. 12th Alopecurus myosuroldes 16 0 2 25th 2 5 10 Avena fatua 0 11 2

0 = no damage 100 = total damage

Treatment method C

Active ingredient I + II I + III I + II + III kg / ha of active substance 0.5 + 0.4 0.5 + 0.5 0.5 + 0.25 + 0.25 Useful plants: Beta vulgaris 0 0 0 unwanted plants: Chenopodium album 6o 65 .80 Sinapis arvensis 70 67 «5 Alopecurus myosuroides 50 63. 70 Avena fatua 48 55 68

0 = no damage 100 = total damage

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Claims (1)

- ίο - o.z. 29 130 2213922 Claim A method for controlling undesired plants, characterized in that, before the appearance of the undesired plants on the surface of the earth, the soil in which the growth of the undesired plants is to be prevented with a) a compound of the formula R ₁ ^ n-co-s-r, R ₂ in which R, a cyclohexyl radical or a BieyeIo- or Tricycloalkylrest with up to 10 carbon atoms, Rp a lower alkyl or alkynyl radical with up to 4 carbon atoms and R_ one mean lower alkyl radical with up to 4 carbon atoms, or b) l-phenyl-4-amino-5-chloropyridazon- (6) or c) a compound of the formula CH ₃ -SO ₂ -O and after the appearance of the unwanted plants on the surface of the earth, the useful plants and the unwanted plants with d) a compound of the formula -CO-O-CH, in which X denotes the methyl radical, and / or e) l-phenyl-4-amino-5-chloropyridazon- (6) treated. Badische Anilin- & Soda-Fabrik AG ,, 309844/1110