JPH10175806A - Method of weeding in flooded paddy field - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove perennial broad leaf weeds when paddling and leveling rotor are worked by scattering a water-suspended herbicidal concentrate composition prepared by suspending a specific pyrazole in water by using a surfactant, into the flooded paddy field. SOLUTION: This water-suspended herbicidal concentrate composition is obtained by suspending (A) 10-50wt.% of a pyrazole compound (e.g. the compound of formula II) of formula I [R is H and methyl; Z is p-toluenesulfonyl and p-methylphenacyl] into (C) water by using (B) 0.1-20wt.% of a surfactant (e.g. a polyoxyethylenestyryl phenyl ether) and when necessary, (D) 0-10wt.% of a water-soluble polymer or a protective colloid. This composition is directly scattered in the original condition into the flooded paddy field. The method is to scatter by shaking a bottle filled with this composition by hand while walking or to mechanically scatter the composition by the scattering machine attached to a tractor and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pesticidal suspension composition. More specifically, general formula (I)

[0002]

Embedded image

(Wherein R represents a hydrogen atom or a methyl group;
Represents a p-toluenesulfonyl group, a phenacyl group or a p-methylphenacyl group), respectively. Urikawa has an extremely high herbicidal effect when the suspended pesticidal composition of the present invention is applied as a pretreatment agent for rice transplantation in flooded sewage paddy fields.

[0004]

2. Description of the Related Art In recent years, for the purpose of labor saving of paddy field weeding,
Oxadiazone emulsions (trade name "Lonstar emulsion") and oxadiazon butachlor emulsions (trade name "Delcut emulsion") have been developed and rapidly spread as emulsions for rice planting pretreatment, which are sprayed from containers as undiluted solutions during scraping work. This weeding method is extremely labor-saving in that it uses a substitute work, which is an essential work in paddy fields. However, these emulsions show a high herbicidal effect from annual weeds such as Nobie, Cyperaceae, Konagi, Azena and Kikasugusa to perennial weeds such as fireflies, pine trees and sedges, but are completely effective against perennial broadleaf weeds such as Urikawa, Omodaka and Hirumushiro. There is a drawback that does not show.

[0005]

On the other hand, these perennial broad-leaved weeds are increasing nationwide. In particular, according to a survey conducted in 1982, the area of urikawa was 37% nationwide and 50% west of Tokai. %. Therefore, in paddy fields where urikawa frequently occurs, systemic treatment with a middle-term herbicide such as phenothiol / simethrin or simethrin / MCPB is required, and the situation in which the power-saving effect of the pre-rice planting treatment is greatly reduced is occurring. Naproanilide (trade name "Urivest Granule") recently developed to cope with the increased outbreak of Urikawa is effective against Urikawa, but due to phytotoxicity to rice seedlings,
It cannot be used as a rice transplant pretreatment agent.

[0006]

Under these circumstances, the present inventors have conducted intensive studies on perennial broadleaf weeds, especially rice planting pretreatment agents that control urikawa at the time of scraping work. By using the pyrazole compound represented by the formula (I) and selecting a suspension-type pesticide composition (also referred to as a sol or flowable) as a formulation, it has been found that the intended purpose can be achieved, and the present invention has been achieved. completed. The present invention relates to: “1.

[0007]

Embedded image

(Wherein R represents a hydrogen atom or a methyl group,
Z is a p-toluenesulfonyl group, a phenacyl group or p-
An aqueous suspension herbicide stock solution obtained by suspending a pyrazole compound represented by a methylphenacyl group) in a water (C) using a surfactant (B) as a surfactant; A method for weeding submerged sewage fields, characterized by spraying on sewage. 2. 2. The method for weeding a flooded sewage paddy field according to claim 1, wherein the application to the flooded sewage paddy field is hand spraying by shaking with a hand while walking a bottle filled with the aqueous suspension herbicide stock solution composition. 3. 2. The method for weeding a flooded sewage field according to claim 1, wherein the spraying on the flooded sewage field is mechanical spraying by a sprayer mounted on a tractor or the like. ”.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The pyrazole compound used as the component (A) in the suspended pesticidal composition of the present invention has the general formula (I):

[0010]

Embedded image

(Wherein R represents a hydrogen atom or a methyl group,
Z is a p-toluenesulfonyl group, a phenacyl group or p-
A methylphenacyl group), which are shown in JP-B-54-36648 and JP-B-54-648.
8885, JP-A-54-70269 and JP-A-57-7290.
3 publications. General formula (I)
Specific examples of the compound represented by the general formula (I)

[0012]

Embedded image

(Hereinafter abbreviated as compound A),

[0014]

Embedded image

(Hereinafter abbreviated as compound B),

[0016]

Embedded image

(Hereinafter abbreviated as compound C), and these are preferred.

The surfactant (B) used in the composition of the present invention includes an anionic surfactant and a nonionic surfactant. Examples of the anionic surfactant include polyoxyethylene alkyl allyl phosphate, polyoxyethylene alkyl allyl ether sulfate, polyoxyethylene styryl phenyl ether sulfate, alkyl allyl sulfonate, lignin sulfonate, alkyl sulfate, dialkyl sulfosuccinate and the like. There are, as nonionic surfactants, for example, polyoxyethylene allyl ether, polyoxyethylene alkyl ether, polyoxyethylene alkyl allyl ether, polyoxyethylene styryl phenyl ether,
Examples thereof include polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkylate, and sorbitan alkyl ester, but are not limited thereto, and these can be used alone or in combination of two or more.

The composition of the present invention is obtained by dispersing the above component (A) with water as the component (C) by the component (B).
Although it is a stable suspension in the form of a suspension, a water-soluble polymer or a protective colloid agent is used as the component (D) to stabilize the suspension of the composition of the present invention and / or adjust the viscosity. can do. Examples of the water-soluble polymer or protective colloid agent include gum arabic, guar gum, sodium alkinate, gelatin, casein, carboxymethylcellulose, xanthan gum, polyvinyl alcohol, sodium polyacrylate, polyvinylpyrrolidone, maleic anhydride-styrene copolymer, Hydroxyethyl cellulose, methyl cellulose and the like are used. These can be used alone or in combination of two or more.

The solvent as the component (C) used in the present invention is mainly water and may be water alone. However, when it is necessary to consider physicochemical properties such as cold resistance, heat resistance, viscosity, specific gravity and the like. , Methyl alcohol, ethyl alcohol, isopropyl alcohol, ethylene glycol, glycerin, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, hydrophilic solvents such as propylene glycol, or in some cases hydrophobic such as xylene, toluene, kerosene, liquid paraffin A single organic solvent selected from solvents or a mixture of two or more organic solvents may be added. Further, in addition to the above components, the suspended pesticidal composition used in the present invention may contain an antifoaming agent such as a silicone-based antifoaming agent or a swelling agent such as bentonite, and may further contain other components if necessary. Is also good.

[0021] The suspended pesticidal composition of the present invention contains the above-mentioned compounding agents in the amount of each component (A): 10 to 50 wt%, preferably 20 to 40 wt%.
wt%, component (B): 0.1 to 20 wt%, preferably 1 to 10
wt%, (C) component: balance, (D) component: 0 to 10 wt%, preferably 0.01 to 5
wt%, is formulated as a formulation. The suspension preparation of the present invention is prepared as described in JP-B-46-20519 and JP-B-58-24.
401, JP-A-57-58601 and JP-A-57-15970
3, 58-124702, 58-162504, and the like. For example,
The solid pesticidal active ingredient (A) is pulverized in advance with a pulverizer such as a jet-omimizer, and the surfactant (B), water (C) and optionally (D) Or mix with other additives and use a homogenizer
By stirring and mixing for 0 to 60 minutes, it is possible to obtain a uniform suspension-form agricultural chemical composition. Alternatively, for example, after the components (A), (B) and (C) and the component (D) are mixed for 30 to 90 minutes by a high-speed stirrer, the mixture is wet-milled with a sand grinder or the like. To obtain a suspended pesticidal composition.

The pesticidal suspension thus produced is used, for example, by spraying 300 to 1000 ml / 10a of the undiluted solution as it is in a container at the time of scraping operation as follows. In the case of hand spraying, in the turbid water state immediately before or immediately after shaking, shake the bottle by hand while walking and spray. In the case of mechanical spraying, attach a special spraying machine used for oxadiazon emulsion etc. to the tractor, etc. and spray dripping simultaneously with the scraping work.

That is, in the present invention, when treating the soil before rice transplanting, (A) the general formula (I), the general formula (I)

[0024]

Embedded image

(Wherein R represents a hydrogen atom or a methyl group,
Z is a p-toluenesulfonyl group, a phenacyl group or p-
A pyrazole compound represented by a methylphenacyl group) with a surfactant (B)
(C) An object of the present invention is to provide a method for soil treatment before rice transplantation using a suspended pesticidal composition suspended in water. The formulation of the suspended pesticidal composition of the present invention is mainly used for controlling perennial broadleaf weeds such as urikawa as a pre-planting treatment agent for flooded sewage paddy fields, but when simultaneously controlling a wide range of paddy weeds, Oxadiazon, butachlor, pretilachlor and the like.

[0026]

Next, production examples and test examples of the present invention will be described. In addition, in each example, a part shows a weight part.

Production Example 1 Compound A: 30 parts, ethylene glycol 5 parts, surfactant (polyoxyethylene styryl phenyl ether, dialkyl sulfosuccinate, 1: 1: 1 mixture of polyoxyethylene alkyl ether, respectively): 5 Department,
0.5 parts of xanthan gum and 59.5 parts of water were weighed and added, and mixed with a homogenizer for 40 minutes.
The mixture was wet-pulverized for 2 hours with a sand grinder to obtain 100 parts of a uniform suspended pesticide composition.

Production Example 2 Compound B: 30 parts, surfactant (phosphate salt of polyoxyethylene phenyl phenol ether): 2
Part, polyacrylic acid: 0.5 part, bentonite: 1 part,
66.5 parts of water were weighed and added, mixed for 40 minutes by a homogenizer, and wet-milled for 2 hours with a sand grinder to obtain 100 parts of a uniform suspended pesticide composition.

Production Example 3 Preparation was carried out in the same manner as in Example 1 except that Compound C was used in place of Compound A, to obtain a uniform suspended pesticide composition.

Test Example 1 (Soil mixing treatment) Using a paddy field divided into 10 m ² (2 m × 2 m)
The test was performed in the following manner as three repetitions of the test plot.
One day after roughing, seeds of germinating nobie, kikasigusa, konagi and firefly were sowed in a fixed amount so that the weeds were uniformly generated, and 20 tubers of urikawa and mizuyayatsuri were embedded in each section. After one day, 5 ml (500 ml / 10
(corresponding to a), and immediately stirred with a rake to a depth of about 10 cm from the surface of the soil. Two days after the application of the drug, rice plants at the 2.5 leaf stage were transplanted. 3-4cm afterwards
And was managed until the survey date. As for the herbicidal effect, 30 days after the chemical treatment, surviving weeds were extracted, and their dry weights were measured and compared with the untreated group. At that time, phytotoxicity to rice was also observed. The results were as shown in Table 1 (displayed as an average of three sections). Simultaneous processing with a butachlor emulsion was carried out in the same manner as in Test Example 1 as a reference example, and the results are shown in Table 1.

[0031]

[Table 1]

Test Example 2 (Turbid Water Treatment) A paddy field treated with weeds as in Test Example 1 was prepared.
After 3 days, the water is flooded to 3 to 4 cm and raked from the surface of soil to 10 cm.
Stir to a depth of about cm. Immediately thereafter, 5 ml (corresponding to 500 ml / 10a) of the drug prepared in Production Example 1 was sprayed. Two days after the application of the drug, rice plants at the 2.5 leaf stage were transplanted. Thereafter, water was immersed to a depth of 3 to 4 cm and managed until the survey date. The herbicidal effect was examined in the same manner as in Test Example 1. The results were as shown in Table 2.

[0033]

[Table 2]

[0034]

When the pyrazole compound represented by the general formula (I) is sprayed as a granule immediately after rice transplantation, it can be obtained from annual weeds such as Nobie, Cyperaceae, Konagi, Azena and Kikasigusa, from fireflies, pine trees, Mizugayatsuri, Urikawa, Although it is known as a herbicide with a wide range of herbicidal spectrum, it has a remarkable effect even on perennial weeds such as Omodaka and Hirumshiro. On the other hand, these pyrazole compounds are solid at ordinary temperature and have low solubility in organic solvents such as those usually used for producing agricultural chemical emulsions. Extremely difficult. On the other hand, suspension pesticide formulations are not a new formulation, but are mainly developed as aerial spray formulations,
There is no known example of the use as a pretreatment agent for rice transplanting in flooded sewage fields. The present inventors, under such circumstances, as a result of intensive studies on pesticide formulations that can be sprayed from the container as undiluted solution at the time of scraping work, by making a specific pyrazole compound into a suspended pesticide composition, The present invention has been found to be able to spray practically sufficiently uniformly in a flooded sewage paddy field, and to show a stable herbicidal effect on broadleaf weeds such as urikawa, thereby completing the present invention. That is, when the pyrazole compound represented by the general formula (I) was made into a suspension pesticide composition and sprayed as undiluted solution at the time of scraping work in a flooded submerged paddy field,
Although the herbicidal effect on grass weeds such as fireflies, pine trees, and sedges was significantly reduced, broadleaf weeds such as urikawa, omodaka, hirumshiro, azena, and kikasigusa have extremely high herbicidal effects. Admitted. When such a pyrazole-based compound represented by the general formula (I) is used as a pretreatment agent for rice transplanting of flooded sewage paddy in a formulation of the suspended pesticidal composition of the present invention,
In particular, Urikawa, which is a problem weed, shows its excellent effect.
It is completely unpredictable from the conventional technology level.

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[Procedure amendment]

[Submission date] September 29, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Weeding method of flooded sewage paddy field

[Claims]

Embedded image (Wherein, R represents a hydrogen atom or a methyl group, and Z represents a phenacyl group or a p-methylphenacyl group, respectively). A herbicidal method for flooded submerged paddy fields, which comprises directly spraying the suspended aqueous suspension herbicide stock solution composition directly onto submerged submerged paddy fields.

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for herbicide application by directly applying a suspension herbicide stock solution directly to a flooded sewage paddy field.
It is about the law . More specifically, general formula (I)

[0002]

Embedded image

(Wherein R represents a hydrogen atom or a methyl group;
As sprayed herbicidal concentrate composition containing the pyrazole compound is represented by the phenacyl group or p- methylphenacyl group respectively) as pesticide bulk
And to provide a method for weeding . The present invention is an aqueous <br/> herbicidal concentrate composition, that before planting the flooded Underwater paddy
It is an invention applied by spraying as it is , and has an extremely high herbicidal effect on Urikawa.

[0004]

2. Description of the Related Art In recent years, for the purpose of labor saving of paddy field weeding,
Oxadiazone emulsions (trade name "Lonstar emulsion") and oxadiazon butachlor emulsions (trade name "Delcut emulsion") have been developed and rapidly spread as emulsions for rice planting pretreatment, which are sprayed from containers as undiluted solutions during scraping work. This weeding method is extremely labor-saving in that it uses a substitute work, which is an essential work in paddy fields. However, these emulsions show a high herbicidal effect from annual weeds such as Nobie, Cyperaceae, Konagi, Azena and Kikasugusa to perennial weeds such as fireflies, pine trees and sedges, but are completely effective against perennial broadleaf weeds such as Urikawa, Omodaka and Hirumushiro. There is a drawback that does not show.

[0005]

On the other hand, these perennial broad-leaved weeds are increasing nationwide. In particular, according to a survey conducted in 1982, the area of urikawa was 37% nationwide and 50% west of Tokai. %. Therefore, in paddy fields where urikawa frequently occurs, systemic treatment with a middle-term herbicide such as phenothiol / simethrin or simethrin / MCPB is required, and the situation in which the power-saving effect of the pre-rice planting treatment is greatly reduced is occurring. Naproanilide (trade name "Urivest Granule") recently developed to cope with the increased outbreak of Urikawa is effective against Urikawa, but due to phytotoxicity to rice seedlings,
It cannot be used as a rice transplant pretreatment agent.

[0006]

Under these circumstances, the present inventors have conducted intensive studies on perennial broadleaf weeds, especially rice planting pretreatment agents that control urikawa at the time of scraping work. using pyrazole compounds of formula (I), selected beauty a herbicidal concentrate composition as formulation, as it is diffusing the stock composition as spraying method to flooded Underwater paddy
The present invention has been found that the intended purpose can be achieved by fabricating. The present invention relates to: “1.

[0007]

Embedded image

(Wherein R represents a hydrogen atom or a methyl group,
Z represents a phenacyl group or a p-methylphenacyl group), and an aqueous suspension of a herbicide stock solution obtained by suspending a pyrazole compound represented by the formula (B) with a surfactant (C) in water: A method for weeding a flooded sewage field, comprising spraying the composition directly on the flooded sewage field. 2. 2. The method for weeding a flooded sewage paddy field according to claim 1, wherein the application to the flooded sewage paddy field is hand spraying by shaking with a hand while walking a bottle filled with the aqueous suspension herbicide stock solution composition. 3. 2. The method for weeding a flooded sewage field according to claim 1, wherein the spraying on the flooded sewage field is mechanical spraying by a sprayer mounted on a tractor or the like. ”.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Aqueous suspension herbicides used in the present invention
The pyrazole-based compound used as the component (A) in the drug solution composition has the general formula (I):

[0010]

Embedded image

(Wherein R represents a hydrogen atom or a methyl group,
Z represents a phenacyl group or a p-methylphenacyl group, respectively.
-28885, JP-A-54-70269, JP-A-57-72
No. 903. Specific examples of the compound represented by the general formula (I) include a compound represented by the general formula (I)

[0012]

Embedded image

(Hereinafter abbreviated as compound A),

[0014]

Embedded image

(Hereinafter abbreviated as compound B), and these are preferred.

[0016] use in herbicidal concentrate <br/> composition used in the present invention (B) a surfactant of the component, anionic surfactants, there are nonionic surface active agents. Examples of the anionic surfactant include polyoxyethylene alkyl allyl phosphate, polyoxyethylene alkyl allyl ether sulfate, polyoxyethylene styryl phenyl ether sulfate, alkyl allyl sulfonate, lignin sulfonate, alkyl sulfate, dialkyl sulfosuccinate and the like. As nonionic surfactants, for example, polyoxyethylene allyl ether, polyoxyethylene alkyl ether, polyoxyethylene alkyl allyl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkylate, sorbitan Examples include, but are not limited to, alkyl esters and the like. These may be used alone or in combination of two or more. It can also be used.

The aqueous suspension herbicide stock solution composition used in the present invention is a suspension in which the component (A) is dispersed in the water as the component (C) by the component (B). Aqueous suspension herbicide stock solution which is a stable suspension of
In order to stabilize and / or adjust the viscosity of the product (D)
As a component, a water-soluble polymer or a protective colloid agent can be used. Examples of the water-soluble polymer or protective colloid agent include gum arabic, guar gum, sodium alginate, gelatin, casein, carboxymethylcellulose, xanthan gum, polyvinyl alcohol, sodium polyacrylate, polyvinylpyrrolidone, maleic anhydride-styrene copolymer, hydroxy Ethyl cellulose, methyl cellulose and the like are used. These can be used alone or in combination of two or more.

Aqueous suspension herbicide stock solution used in the present invention
The solvent as the component (C) of the product is mainly water and may be water alone. However, when it is necessary to consider physicochemical properties such as cold resistance, heat resistance, viscosity and specific gravity, methyl alcohol, ethyl A hydrophilic solvent such as alcohol, isopropyl alcohol, ethylene glycol, glycerin, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, and propylene glycol, or, in some cases, a single solvent selected from hydrophobic solvents such as xylene, toluene, kerosene, and liquid paraffin Alternatively, two or more kinds of organic solvents may be added. In addition, the aqueous suspension herbicide stock solution composition used in the present invention may contain, in addition to the above components, an antifoaming agent such as a silicone-based antifoaming agent and a swelling agent such as bentonite. You may mix.

The aqueous suspension herbicide stock solution composition used in the present invention is prepared by adding the above-mentioned ingredients to the component (A): 10 to 50% by weight, preferably 20 to 40% by weight.
wt%, component (B): 0.1 to 20 wt%, preferably 1 to 10
wt%, component (C): balance, component (D): 0 to 10 Wt%, preferably 0.01 to 5
wt%, is formulated as a formulation. Preparation of the aqueous suspension herbicide stock solution composition used in the present invention is described in JP-B-46-2051.
9, 58-24401, JP-A-57-58601, 57-159703, 58-124702, 58-
162504 can be carried out by the method described in each of the publications. For example, the solid pesticidal active ingredient (A) is pulverized in advance by a pulverizer such as a jet optimizer, and then the surfactant (B), the water (C), and (D) ) The components or other additives are blended, and the mixture is stirred and mixed with a homogenizer for 10 to 60 minutes to obtain a uniform aqueous suspension of a herbicide stock solution composition. Or, for example, using a high-speed stirrer (A), (B)
And component (C) and, if necessary, component (D) in an amount of 30 to
After mixing for 90 minutes, these mixtures are finely pulverized with a wet pulverizer such as a sand grinder to obtain an aqueous suspension herbicide stock solution composition.

Aqueous suspension herbicidal product thus produced
The agent stock solution composition is used by spraying 300 to 1000 ml / 10a of the stock solution in a container as it is at the time of the scraping operation as follows. In the case of hand spraying, in the turbid water state immediately before or immediately after shaking, shake the bottle by hand while walking and spray. In the case of mechanical spraying, attach a special spraying machine used for oxadiazon emulsion etc. to the tractor, etc. and spray dripping simultaneously with the scraping work.

That is, in the present invention, when treating the soil before rice transplanting, (A) general formula (I), general formula (I)

[0022]

Embedded image

(Wherein R represents a hydrogen atom or a methyl group,
Z represents a phenacyl group or a p-methylphenacyl group, respectively) (B)
The present invention provides a method for herbicidal treatment in which soil is treated before rice transplanting with a surfactant (C) an aqueous suspension herbicide stock solution composition suspended in water using a surfactant. Aqueous suspension removal used in the present invention
Formulations herbicide stock solution composition, when primarily but arrowhead is to herbicidal perennial broadleaf weeds such as, for simultaneously weeding a wide range of paddy weeds as planting pretreatment agent flooded Underwater paddy fields, oxadiazon, It is effective to spray simultaneously with emulsions such as butachlor and pretilachlor.

[0024]

Examples Next, production examples of the aqueous suspension-form herbicide stock solution composition used in the present invention , examples of the herbicidal method, and herbicidal effects will be described. In addition, in each example, a part shows a weight part.

Production Example 1 Compound A: 30 parts, ethylene glycol 5 parts, surfactant (polyoxyethylene styryl phenyl ether, dialkyl sulfosuccinate, 1: 1: 1 mixture of polyoxyethylene alkyl ether, respectively): 5 Department,
0.5 parts of xanthan gum and 59.5 parts of water were weighed and added, and mixed with a homogenizer for 40 minutes.
The mixture was wet-milled for 2 hours with a sand grinder to obtain 100 parts of a homogeneous aqueous suspension of herbicide stock solution composition.

Production Example 2 Compound B: 30 parts, surfactant (phosphate salt of polyoxyethylene phenyl phenol ether): 2
Part, polyacrylic acid: 0.5 part, bentonite: 1 part,
66.5 parts of water are weighed and added, respectively, mixed by a homogenizer for 40 minutes, and then wet-milled with a sand grinder for 2 hours to obtain a uniform aqueous suspension herbicide stock solution composition:
100 parts were obtained.

[0027] Using the paddy fields partitioned in Example 1 (soil incorporation treatment) 1 ° ^{10m 2 (2m × 5 m)} , 1
Weeding was performed in the following manner in three replicates of the test plot .
Weed is good uniform germination in the rough generation oyster One day after to generate barnyardgrass, Rotala indica, vaginalis, one by a certain amount of seeds of bulrush Maki, furthermore, arrowhead, is embedded, the tubers of Cyperus by 20 pieces in one district. One day later, the herbicide stock solution composition prepared in Preparation Example 1 was flooded with water to 3 to 4 cm, and
ml (corresponding to 500 ml / 10a) and immediately stirred with a rake to a depth of about 10 cm from the surface of the soil. Two days after the application of the drug, rice plants at the 2.5 leaf stage were transplanted. Thereafter, water was immersed to a depth of 3 to 4 cm and managed until the survey date. As for the herbicidal effect, 30 days after the chemical treatment, surviving weeds were extracted, and their dry weights were measured and compared with the untreated group. At that time, phytotoxicity to rice was also observed. The results were as shown in Table 1 (displayed as an average of three sections). Simultaneous processing with a butachlor emulsion was carried out in the same manner as in Test Example 1 as a reference example, and the results are shown in Table 1.

[0028]

[Table 1]

[0029] Prepare the paddy treated weeds in the same manner as in Example 2 (turbid water treatment) Example 1, Part 1
After 3 days, the water is flooded to 3 to 4 cm and raked from the surface of soil to 10 cm.
Stir to a depth of about cm. Immediately thereafter, 5 ml (50 ml ) of the herbicide stock solution composition prepared in Production Example 1 was directly used.
(Corresponding to 0 ml / 10a). Two days after the application of the drug, rice plants at the 2.5 leaf stage were transplanted. 3-4c afterwards
m and buried until the day of the survey. Herbicidal effect was investigated in the same manner as in <br/> Example 1. The results were as shown in Table 2.

[0030]

[Table 2]

[0031]

That is, the pyrazole compound represented by the general formula (I) is used as an aqueous suspension herbicide stock solution composition, and the stock solution is not sprayed as it is at the time of paddling in a flooded paddy field. Although the herbicidal effect on grass weeds such as pine trees, pine trees and sedges was significantly reduced, broadleaf weeds such as Urikawa, Omodaka, Hirumshiro, Azena and Kikasigusa showed extremely high herbicidal effects. Was done.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kiyoshi Sugaya 8-1, Chuo, Ami-cho, Inashiki-gun, Ibaraki Pref.

Claims (3)

[Claims] (A) General formula (A) (Wherein, R represents a hydrogen atom or a methyl group, and Z represents a p-toluenesulfonyl group, a phenacyl group or a p-methylphenacyl group, respectively) using a (B) surfactant (C) A herbicidal method for flooded submerged rice fields, which comprises spraying the aqueous suspension herbicide stock solution composition suspended in water directly onto the flooded submerged rice fields. 2. The flooding method according to claim 1, wherein the spraying on the flooded sewage paddy field is a hand spraying method in which a bottle filled with the aqueous suspension herbicidal stock solution composition is shaken and shaken by hand while walking. Weeding method of sewage field. 3. The method for weeding a flooded sewage field according to claim 1, wherein the spraying on the flooded sewage field is mechanical spraying by a sprayer mounted on a tractor or the like.