DE1642318B2 - HERBICID - Google Patents

Description

The invention relates to a herbicide which is characterized by a content of at least one of the compounds 3 - (p - bromophenyl) -1 - methoxy - 1 - methylurea, 3 - (3,4 - dibromophenyl) 1 - methoxy - 1 - methylurea or 3 - (3 - bromo 4 - methylphenyl) -1 - methoxy -1 - methylurea.

The herbicides according to the invention can be used in corn or potato fields for control of weeds such as Digitaria Setaria, Echinochloa, Sorghum halepense seedlings, Portulaca oleracea, Amaranthus, Xanthium, Abutilon theophrasti medio, Ipomoea, Chenopodium album and Ambrosia artemisüfolia. Excellent results are achieved when using one of the three active ingredients in potato fields. The weeds are destroyed without damaging the potato plants.

The active ingredients used in the herbicides according to the invention can be mixed with anionic, cationic or nonionic surfactants. About these surfactants include, for example, sodium alkylnaphthalene sulfonate, sodium and potassium oleate, amine salts of oleic acid, such as morpholine and dimethylamino helates, the sulfonated animal and vegetable oils, such as sulfonated Fish and castor oils, the sulfonated petroleum oils, sulfonated acyclic hydrocarbons, sodium lignosulfonate and other wetting, dispersing and emulsifying agents.

The surfactant content of the herbicide is generally 0.1 up to 15% by weight based on the weight of the whole herbicide.

The herbicides are commonly used on the spot or area from unwanted plant growth referred to as "weeds," d. H. Plants that grow in an undesired place, protected should be applied as a spray, in granulated or pelletized form or as dust. This application can directly affect the area to be treated and the weeds located there during the Period of infestation is done to destroy the weeds, but before one if desired expected infestation to prevent it. The herbicides according to the invention can be applied in aqueous form Spray on the foliage or apply it directly to the soil surface by spraying. on the other hand you can also dust dry powder preparations directly onto the plants or the ground.

The application of granules is an effective way to control weeds before they emerge growing plants with minimal damage to foliage. The application of pellets, by hand or with machines, is an effective method of achieving a complete Destruction of unwanted plant growth on fences, under power lines and on the like Places.

The active compound is applied in an amount sufficient to achieve the desired control. The amount in which the active ingredient is in the means in the actual application form located in the control of weeds changes with the type of application that is used controlling weeds, purposes of application, and similar variables.

In general, the herbicides according to the invention contain, when applied in the form of a dust, Granules, pellets or a spray about 0.5 to 85 wt .-% of the urea compound. The applied The amount of the active ingredient is 0.28 to 112 kg / ha.

The herbicides according to the invention can fertilizers, other herbicides, pesticides, such as Insecticide and Fungicide and common pesticide diluents.

The active ingredients used in the herbicides according to the invention can be prepared by reacting the corresponding phenyl isocyanate with the corresponding N-alkyl-O-alkylhydroxylamine. This reaction is conveniently carried out by gradually adding the isocyanate in an inert liquid to a solution of the amine in the same liquid. Solvents such as xylene, toluene, dioxane, hexane, ether, acetone or water can be used. In general, temperatures are satisfactory from 0 to 13O ⁰ C. On the other hand, the amine can also be added to the isocyanate.

The production of the active ingredients used according to the invention is not claimed here.

example 1

A preparation that is dispersible in water is produced by first adding the following ingredients mixes and then grinds in a hammer mill and then in a jet mill:

3-6 (p-bromophenyl) -1-methyl-1-methoxyurea (F. 88.5-

89.5 ⁰ C) 40.00%

Alkyl naphthalene sodium sulfonate ... 1.75% Low viscosity methyl cellulose 0.25% Attapulgite 58.00%

The preparation is used for a combined control of weeds before and after emergence in Used potato fields. The mixture is used in an amount of 3 kg of active ingredient per hectare in 1701 Water on an accrued stock of Setaria, Digitaria, Sorghum halepense, Amaranthus and Chenopodium album. Excellent weed control with a long-lasting effect is obtained on the weeds until the leaves of the potato plants shade most of the soil.

Example 2

A preparation which is dispersible in water is produced by adding the ingredients listed below mix first and then finely pulverize until all particles are substantially smaller than 50 microns are:

3 4

3- (3-Bromo-4-methylphenyl) - The agents according to the invention are known

1-methyl-1-methoxyurea 3,4-dichloro derivative with regard to the degree of damage

(M.p. 82.5 - 85.5 ° C) 75.00% of the sorghum plants superior.

Sodium dodecylbenzenesulfonate 1.75% Sodium lignosulfonate 1.00% s comparative experiment 2 Diatomaceous earth 22.25% Herbicidal effectiveness against Bromus secalinus

rx- <-. · L j »j» nr in wheat after emergence This mixture is used before emergence

in an amount of 3 kg of active ingredient per hectare of potato. Wheat and Bromus secalinus are planted in soil

field. Excellent control of _{) 0 is obtained} and it is left in the greenhouse for 8 days. Then you bring

Digitaria, Setaria, Echinochloa crusgalli, Amaranthus, the active substances to be tested on the plants and the Stellaria and Poa annua. The potato plants are ground on. 3 weeks later you check the results

not harmed. nits visual. The numbers and letters have the

... . , same meaning as in test report 1.

Example 3 ^e

I ₅ _

A preparation which is dispersible in water is provided _kg / _na wheat bromus

by placing the following components in a secalinus

Tube mill or sand mill mixes together until

the insoluble components all essentially have one

Particle sizes below 5 microns have: ₂₀ 3- (p-bromophenyl) -1-4.5 9C IOC

methyl-1-methoxyurea 3- (3,4-dibrornophenyl) -l-methyl-

1-m ^ oxyurea (F. 100- ^

Sodium Lignosulfonate ........... 15 ^ 00% 3- (3,4-Dibromophenyl) -1- 4,5 4C 10C Hydrated attapulgite 1.75% ²⁵ methyl-1-methoxyurea

• Sodium pentachlorophenolate 0.70% 3- (3,4-dichlorophenyl) -l- 4.5 8 C IOC

Disodium phosphate 0.90% methoxy-1-methylurea ^{Water 57} > ^65% 3-p-chlorophenyl-1-4.5 IOC 9 C

This preparation is used in an amount of ₃₀ methoxy-1-methylurea of 2.5 kg of active ingredient per hectare in 1501 of water in maize fields, both as a means for controlling, with the exception of the p-bromophenyl derivative, those of weeds before emergence as well as after the active ingredients according to the invention both comparative emergence. In the growing crops, the weed seedlings are destroyed with regard to the damage to wheat. Man 35 lay
also maintains a good long-term control of the weeds. Digitaria, Setaria, Sor comparative experiment 3, ghum halepense, Amaranthus, Abutilon theophrasti “are well combated. . ".. medio, Hibuscus trionum and many other weeds, .. _ fungicidal effect

with good crop growth. ₄ o ^of l '^ T ^ Vi ^ t ^ ufh

r * _of 3- (4-chlorophenyl) -l-methyl-l-methoxy-urea

Comparative experiment 1 and from

Herbicidal activity against Digitaria 3- (3,4-dichlorophenyl) -l-methoxy-l-methyl-urea in sorghum culture before emergence

Sorghum and digitaria seeds are placed in pots 45. Soil which is infected with the fungus Rhizoctonia Solani with 12.5 cm of soil and treated with the test to be tested is filled into 0.5-1 containers. The connections to be checked. After 16 days, the connections are checked with the upper, 5 cm thick soil results by visual observation. The results layer mixed in an amount of 37 kg per hectare are given in the following way: Numbers from 0 to 10 Then you plant cotton and beans. After specifying the degree of effectiveness, 0 means no damage, 50 the plants are tested for fungal attack for approximately 2 weeks, 10 means that all plants are damaged. checked.
In the letters B = plant burns;

C = chlorosis and necrosis and G = growth inhibition "., .... _f

mung. Fungus control

55 < ^% >

kg / ha of Sorghum Digitaria

3- (p-Bromophenyl) -l-methyl-1-100

3- (p-Bromophenyl) -l-me- 0.28 6 C IOC methoxyurea

ethyl-1-methoxyurea 3- (3,4-dichlorophenyl) -l-methoxy-0

3- (3-Bromo-p-tolyl) -l- 0.28 0 IOC * » 1-methylurea methoxy-1-methylurea

3- (3,4-pibromophenyl) -l- 0.28 4 C 10 C _{Inoculate dilute} nutrient solutions of the

methyl-1-methoxyurea _{budding Tabeüe of} g _e r _ünrten derivatives with a droplet-

3- (3,4-DichlorophenyI) -l- 0.28 IOC IOC 65 fen a spore suspension of Rhizopus nigricans,

methoxy-1-methylurea incubated for 4 days at 24 C and determines the mycelial

3-p-chlorophenyl-l-meth- 0.28 2 G IOC growth compared to an active ingredient-free control

oxy-1-methylurea solution, the following results are obtained:

Active ingredient- 3- (p-bromophenyl) -1-methyl-l- 3- (p-chlorophenyl) -l- Concentration methoxy-ureal 'methyl-1-methoxy-

urea

600 ppm no mycelial growth no effect

500 ppm no mycelium growth no effect

250 ppm no mycelial growth no effect

The p-bromophenyl derivative according to the invention accordingly has a desired fungicidal side effect the comparison means are missing.

Claims (1)

Claim: Herbicide, characterized in that it contains at least one of the compounds 3 - (p - Brompheny I) -1 - methoxy -1 -methylurea, 3 - (3,4 - dibromophenyl) -1 - methoxy -1 - methylurea and 3 - (3 - bromo · 4 - methylphenyl) -I -methoxy-1-methylurea.