JPS5813521B2 - Benzthiazolylkeijiyosouzaibutsu - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides benzthiazolyl urea compounds and S-ethyl-
The present invention relates to a herbicide composition containing as an active ingredient a mixture with hexahydro-1H-azepine-1-carbothioate (common name molinate, hereinafter abbreviated as molinate). R represents a lower alkyl group, and R1 represents a hydrogen atom or a methyl group.

This is a herbicidal composition characterized by containing a mixture of one or more of the compounds represented by ) and molinate as an active ingredient.

The present inventors have carried out research with the aim of providing an economical and safe herbicide composition without the risk of chemical damage to crops by increasing the herbicidal power of the compound represented by the general formula [■] However, when the conventionally used herbicide molinate is added, the selective herbicidal action of the compound represented by formula [■] and molinate, respectively, is not only increased additively, but also extremely highly synergistic. They discovered that it has a herbicidal effect and completed the present invention.

That is, a mixed herbicide composition of the compound represented by the formula [■] and molinate is particularly effective against firefly, and can reduce the amount of the chemical used compared to when each is used alone.
It exhibits a herbicidal effect on Japanese grasshopper, Japanese cypress, Japanese cypress, Japanese grasshopper, and other broad-leaved weeds, and exhibits a complete and safe herbicidal effect and a large economic effect in weed control.

Molinate is used as a herbicide for paddy rice, but it has the disadvantage of being weakly effective against broad-leaved weeds and weeds of the Cyperaceae family.

When molinate is blended with the compound represented by formula [■], target weeds can be sufficiently killed with a lower dose than when each compound is used alone, and therefore, no chemical damage to crops occurs.

Regarding the mixing ratio of each, molinate should be added in an amount of 1/10 to 20 times, preferably 1/5 to 10 times, more preferably 1/5 to 5 times the amount of the compound represented by formula [■]. It is possible to achieve a sufficient herbicidal effect with a low dose.

Next, an example of the benzthiazolyl urea herbicide used in the present invention is shown below.

The herbicidal composition of the present invention is prepared by mixing one or more of the compounds represented by the general formula [■] and an appropriate amount of molinate with a carrier, in the form of a commonly used agricultural chemical;
For example, it is used in the form of wettable powders, emulsions, powders, granules, etc.

Examples of solid carriers include talc, bentonite, turret, and diatomaceous materials, and examples of liquid carriers include water, alcohol, benzene, xylene, kerosene, mineral oil, cyclohexane, dimethylformamide, and the like.

If necessary, a surfactant can be added to these preparations in order to obtain a uniform and stable form.

In the herbicidal composition of the present invention, the concentration of the active ingredient can vary depending on the form of the formulation mentioned above;
For example, in hydrating agents, 5 to 80%, preferably 10 to 6%
0%, 5-70% in emulsions, preferably 20-60%
%, 0.5 to 30% for powders and granules, preferably 1
A concentration of ~10% is used.

The wettable powders and emulsions obtained in this way can be diluted with water to a predetermined concentration to form a suspension or emulsion, and the powders and granules can be sprayed or treated on the soil before weed germination. It can be mixed or sprayed on leaves after weed germination.

When actually applying the herbicide composition of the present invention, 10
An appropriate amount of the active ingredient is applied per area of 10 g or more, preferably 25 g or more.

Next, some examples regarding the herbicide composition of the present invention are shown,
The active ingredient compounds, additives, and addition ratios are not limited to the examples of the present invention, and can be varied within a wide range.

Example 1 Emulsion Compound 3 20 parts molinate 20 parts xylene
35 parts dimethylformamide
15 parts polyoxyethylene phenyl ether At least 10 parts were mixed and dissolved to obtain an emulsion containing 40% of the active ingredient.

Example 2 Wettable powder compound 4 10 parts molinate
30 parts diatomaceous earth
23 parts talc
29 parts Sodium alkyl sulfate 8 parts or more were uniformly mixed and finely ground to obtain a wettable powder containing 40% of the active ingredient.

Example 3 Granule Compound 3 2 Part Molinate
5 parts talc
35 part clay
35 parts bentonite 16 parts argyl sulfate soda 7 parts or more are mixed uniformly, pulverized finely, and then granulated with a diameter of 0.5 to 1.0 m using a granulator.
granules containing 7% of the active ingredient were obtained.

Next, test examples regarding the effects of the herbicide composition of the present invention will be shown.

Test Example 1 Herbicidal effect test in a paddy field After the grass was sown in a paddy field and mixed in the soil, paddy rice (variety: Nipponbare) was transplanted.

Eighteen days after transplanting paddy rice, granules of the test compound were uniformly spread on the soil surface.

The stages of paddy rice and weeds at the time of spraying are paddy rice (second tillering stage), golden weed (germination to four-leaf stage), and Japanese snail (two- to four-leaf stage).
4-leaf stage) Japanese sagebrush (2-leaf stage), and other broad-leaved weeds (germination to first true leaf development).

The growth status of weeds was investigated 30 days after treatment.

The criteria for determining the growth status are 0 = plant damage rate of 0-10%, 1 = plant damage rate of 10-20%, and 2 = plant damage rate of 20-40%.
, 3 is a plant damage rate of 40-80%, 4 is a plant damage rate of 80-80%
The plant damage rate was expressed in 6 stages with 99% and 5 being 100%, and the results shown in Table 1 (a) and (b) were obtained.

Test example 2 Weed efficacy and phytotoxicity test in direct sowing of paddy rice or transplantation of rice in concrete pots depending on the condition of paddy fields in concrete pots Paddy soil was filled in a concrete pot equivalent to 2500 cm2, and seeds of Japanese millet, Japanese staghorn, and bulrush were sown to a depth of 1 cm from the surface layer. After mixing in the soil, tubers of Cyperus japonica and stocks of Cyperus japonica were transplanted, and paddy rice seeds at the time of germination were sown on the soil surface (direct sowing) or paddy rice seedlings were transplanted.

Seven days after paddy rice sowing and transplanting, granules of the test compound were uniformly sprinkled on the soil surface.

The stages of paddy rice and weeds at the time of chemical spraying are paddy rice {1.5 leaf stage (direct sowing) and early tillering stage (transplanting)}, Japanese millet (germination to 3 leaf stage), Japanese grasshopper (germination to first true leaf), and firefly. (starting stage of germination), and Cyperus japonica (starting stage of germination).

The growth status of the plants was investigated on the 14th day after the chemical treatment, and according to the criteria for growth status according to Test Example 1, Table 2 (a), (
The results shown in b) were obtained.

Claims (1)

[Scope of Claims] 1. One or more compounds represented by the general formula (wherein R represents a lower alkyl group and R1 represents a hydrogen atom or a methyl group) and S-ethyl-hexahydro-1H -A herbicide characterized by containing a mixture with azepine-1-carpotioate as an active ingredient.