SU578819A3 - Herbicide - Google Patents

Description

(54) HERBICID MEANS

where R is hydrogen or methyl;

R is methyl or methoxygruppa; X - oxygen or sulfur.

The agent according to the invention effectively affects undesirable plants in both pre-emergence and post-emergence applications. Reko

The recommended doses of these drugs are from 0.1 to 10 kg / ha, preferably from 0.5 to 5 kg / ha.

The form of application of the proposed compound is common: emulsion solutions, suspensions, pasty, powders, etc. They are prepared in known ™ ways.

The content of active substances in these forms is from 0.1 to 95 wt.%.

The preparation of these compounds is based on the reaction of 3 trifluoromethyl - 4 fluorophenyl isocyanate or isosothiocyanate with the corresponding amines. They can also be prepared from 3-trifluoromethyl-4-fluoroiiline and the corresponding isoniachates or carbamoyl chlorides.

Compounds of the above general formula:

N - 3 - trifluoromethyl - 4 - fluorophenyl - N, N

-dimethylurea (1)

N - 3 - trifluoromethyl - 4 - fluorophenyl - S-methyl - N - methoxyurea (II)

N - 3 - trifluoromethyl - 4 - fluorophenyl - N-methyl urea (III)

N 3 - trifluorophenyl - 4 - fluorophenyl - N, N-dimethylurea (IV)

Example 1. Under the conditions of the greenhouse, the following active plants are sown: wild oats, bristles, mustard, and black rats.

The post-emergence treatment of these plants was carried out with a 1% aqueous solution of the compounds, and II 10–12 days after sowing at stage 2-3; The determination of the effect of the substances was made 30 days after the treatment of the plants. Pre-emergence treatment is done 24 hours after sowing the plants. The results of the treatment of compounds I and II are shown in Table. 1 and 2 respectively.

The results are evaluated in examples 1 and 2 according to the following scale: 1-3 plants are intact or barely damaged; 4-6 is the average degree of damage; 7-8 - severe damage; 9 plants died.

Table 1

Plant

Example 2. Under greenhouse conditions, experimental plants were sown and pre-emergence and post-emergence experiments were carried out.

during post-harvest treatment, plants are thawed 10-12 days after sowing at the 2-3 leaf stage. Processing lead 1% water

Table 3

Treatment

solution; dose of 2 kg / ha for the active substance. The evaluation of the results was carried out 20 days after the treatment of the plants.

Pre-emergence treatment is carried out 24 hours after seeding the plants with a 1% aqueous solution at a dose of 2 kt / ha.

The results of the experiments are presented in table. 3

Table 3

Example 3. For testing, plant seeds are sown in pots with soil so that 8-20 plants can develop in each pot. The pots are placed in the greenhouse.

Ir pre-harvest cultivation of the potted soil is sprayed with a predetermined amount of the test substance on the day after sowing. The powder is dissolved in water. The quality of the sprayed solution corresponds to 4.1 and 0.5 kg / ha. Plants are grown in tesh at 22-23 ° C to 50-70% relative humidity.

During post-harvest processing, pots in which seeds were planted are placed in a greenhouse.

12 days after sowing at the stage of 2-3 leaves, they are sprayed with the composition. Evaluation of the results was carried out 4 weeks after the treatment according to the following scale: 9 - the plants are intact, develop in the same way as the plants in the control experiment; 5 - 50% of plants are damaged; I - plants destroyed. The results of pre-emergence processing are given in table. 4, and post-harvest - in table. 5. For comparison, N-3-trifluoromethylphenyl-N, N-dimethylurea (A) was used; - N - 3 - trifluoromethylphenyl - N .methyl- N - methoxyurea (B); N-3. Trifluoromethylphenyl - N - methyl urea (B).

Table 4

Table 5

Claims (2)

1. Patent Shveyvdrii N "478523, cl. A01 N 9/20,1969. 2. Patent «РГ N 1284151, cl. 45 I 19/02, 1968.