SU344618A1 - ALL-UNION flpLEaTya-tnkhky ^ gs ^ {4IBBLY07? HA A Foreigner Diter Dürr (Switzerland) Foreign company "Ciba-Geigy A G" (Switzerland) GERBICID - Google Patents

Description

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

It is known to use substituted aryl ureas as herbicides, for example, N-4-methoxyphenyl-NlN-dialkylureas. However, many herbicides of this group do not effectively suppress the growth of weed plants and are low-selective in relation to cultivated plants.

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

SNZR

) C-N (

W / -II

 Xo SNS

Rde f is hydrogen, lower alkyl or lower

quinil;

X is hydrogen or chlorine.

The proposed compounds have high herbicidal activity and are selective for cereals, rice, corn, soybeans, and cotton. The recommended doses for selectively controlling weeds in crops of these plants range from 0.1 to 10 kg / ha, preferably 0.5 to 5 kg / ha. The compounds are effective in both pre-emergence and post-emergence applications.

The forms of application of the proposed compounds are common: solutions, suspensions, pastes, powders, emulsions, etc. They are prepared by known methods, common in the preparation of preparative forms of pascides. In addition, they can be used in combination with other pesticides or in combination with fertilizers.

The method for preparing the proposed compounds is based on the reaction of the corresponding aryl isocyanates with amines.

In tab. 1 shows the individual compounds of the general formula.

15

Table 1

20

25

Example 1. A. Pre-emergence application.

The prepared soil is sown on the seeds of experimental plants and after 24 hours it is treated with JMb 1 compound at a dose of 1 kg / go.

B. Post-harvest application. Experimental plants in the stage of 2–3 present leaves are treated with compound No. 1 at a dose of 0.25 kg / ha.

Herbicidal activity is assessed on a devial scale:

1 - no damage,

9 is full of plant death. The results of the experiment are given in table. 2

table 2

They are divided into 10 kg by volumes, treated with Compound No. 1 at a dose of 0.5 / cg / ha. A known herbicide in the same dose is used as a reference.

Herbicidal activity is estimated by the devibal scale as in Example 1.

The results of the experiment are given in table. 3

Table 3

Example 2. Post-harvest application. Experimental plants (corn, chicken millet, and capcell), grown in field conditions Experimental data indicate a high herbicidal activity of the proposed compounds and their selectivity.

Subject invention

The use of substituted arylureas of the general formula:

NH-C-N

About CH

where R is hydrogen, lower alkyl

quinil;

X is hydrogen or chlorine, as a herbicide.