SU317170A1 - - Google Patents

Description

The invention relates to chemical means for controlling weeds in crops of cultivated plants.

Known use as herbicides substituted arylureas. The compounds of this tina are widely used for chemical cultivation of cultivated plants, however, some weed species are resistant to these herbicides.

It is proposed to use substituted arylureas of the general formula as a new selective herbicide in cotton crops.

h: but

NH-C-N:

CH;

Z is unsubstituted or substituted normal or iso-alkyl with the number of carbon atoms I-4, unsubstituted or substituted alkenyl or alkynyl with the number of carbon atoms 2-4;

Y is a halogen atom or trifluoromethyl group.

with N-methylformampd. P1x can be used in the form of conventional formulations (solutions of a suspension, paste, powders or granules) prepared by known methods.

The content of the active substance in the preparation may be in the range of 0.1-99.5%. To solve the field of use, the compounds proposed can be used in a mixture with other herbicides, for example, triazines, phenols, carboxylic acids, carbamates and others.

 Some compounds are listed that meet the indicated formula. 1. N- (3-Trifluoromethyl-4-isopropoxyphenyl) K-formyl-G-methyl urea.

2.N- (3 - Trifluoromethyl - 4 - ethoxyphenyl) -Nformyl-N-methyl urea.

3.N- (3-Trifluoromethyl-4-methoxyphenyl) -Nformyl-N-methyl urea.

4.N- (3-Chloro-4-methoxyphenyl) -Y-formyl-Mmethyl urea a.

5.N- (3-Chloro-4-ethoxyphenyl) -Y-formyl-methylmethyl.

6. - Chlorop-4 (-2-methoxy) ethoxyphenyl-N-methyl-N-methylchemicin.

7.N- (3-Trifluoromethyl-4-isobutenyloxyphenyl) -M-formyl-M-methylurea.

Example 1. Post-harvest application.

Experimental plants in the 2–3 leaf stage are treated with aqueous solutions of compounds 1, 2 and 5 at doses of 1 and 2 kg / ha, and 20 days after the treatment, the herbicidal activity is taken into account on a nine-point scale: 1–3 no damage or light damage - about - average

damage:

not a plant; damage; 9 6-8 - strong - full of plant death. results

represented in

Isany Table. I. Table 1

table 2

Example 2. Pre-emergence application.

Seeds of experimental plants are sown in the prepared soil and 24 hours after sowing the soil is treated with solutions of compounds I, 2, 3, 4 and 5 in doses of 2 and 4 kg / ha.

Accounting for herbicidal activity was carried out on the same scale.

The test results are presented in table. 2

The data presented in table. 1 and 2, testify to the high herbicidal activity of the proposed compounds and the selectivity of their action with respect to cotton.

Subject invention

Use of substituted arylureas of the general formula

it is clear

NH-C -N: II O

SNS

where Z is unsubstituted or substituted normal or iso-alkyl with 1-4 carbon atoms, unsubstituted or substituted alkenyl or alkynyl with 2-4 carbon atoms;

Y is a halogen atom or trifluoromethyl group,

Used as a herbicide.