JP6770697B2 - Herbicidal suspension preparation, its manufacturing method and method of reducing phytotoxicity by the preparation - Google Patents

Description

The present invention relates to an aqueous suspension preparation for herbicide that reduces phytotoxicity caused by a herbicide, a method for producing the preparation, and a method for reducing phytotoxicity caused by the preparation.

Flowable preparations as aqueous suspension preparations, which are classified as liquid preparations for pesticides, have the characteristics of high safety, low flammability and odor, and easy storage and handling because water is used as a solvent. When such a flowable preparation is formulated as a herbicide (herbicide flowable), the herbicide flowable is dropped and applied to the water outlet of the paddy field at the time of water entry after rice planting to exert a medicinal effect on the entire surface of the paddy field. In addition, after entering the water, the undiluted solution of the herbicide flowable bottle is sprayed by hand, or sprayed (nozzle sprayed) while walking along the ridge using a sprayer.

Not limited to such herbicide flowables, technical measures have been made to reduce phytotoxicity caused by herbicides. Patent Document 1 discloses a herbicide-phytotoxicity-reducing agent combination agent that enables a combination of a herbicide and a compound having a phytotoxicity-reducing effect to reduce phytotoxicity. Further, in Patent Document 2, even if the chemical solution of the herbicide adheres to the paddy rice stem leaf portion, the surface tension is 36 to 65 din / cm (25) so that the chemical solution is dropped from the paddy rice leaf blade portion by applying surface tension. An aqueous suspension composition for herbicide having physical properties of (° C.) is disclosed. Further, Patent Document 3 states that the viscosity of the preparation is in the range of 300 to 800 mPa · s in order to suppress the occurrence of the phytotoxicity of the preparation on the leaf surface of the rice body and the phytotoxicity of the preparation on the leaf sheath of the rice body. A herbicidal suspension preparation, which is one of the constituent requirements, is disclosed.

However, in a combination agent as in Patent Document 1, the phytotoxicity reducing action has to depend on the combination of the herbicide and the compound having the phytotoxicity reducing effect, and the selectivity of the herbicide cannot be enhanced, and the compound. Because of the combination of the above, there is concern about the impact on the environment such as residue in the soil.
Further, even if the surface tension and viscosity are designed as in Patent Documents 2 and 3, the adhesion cannot be completely prevented, and if they adhere, phytotoxicity may occur.
Further, when the nozzle is sprayed, a part of the nozzle becomes mist and easily adheres to the leaf surface or the like, which may cause phytotoxicity.

Japanese Unexamined Patent Publication No. 2006-124388 JP-A-63-107901 Japanese Patent No. 5280733

Therefore, the present invention can reduce phytotoxicity while reducing the impact on the environment by exerting a physical action on the phytotoxicity component without depending on the combination with the compound having the phytotoxicity-reducing effect. To provide a completely new type of herbicidal aqueous suspension preparation, a method for producing the same, and a method for reducing phytotoxicity caused by the preparation.
It is possible to increase the selectivity of the herbicide without being limited to the combination with a specific herbicide active ingredient, and it is also useful for the herbicide designed by adjusting the surface tension and the viscosity of the formulation, and further, the nozzle. It is an object of the present invention to provide a herbicide aqueous suspension preparation capable of reducing phytotoxicity even if the herbicide flowable is sprayed, a method for producing the same, and a method for reducing phytotoxicity by the preparation.

As a result of diligent studies to solve the above problems, the present inventors contain at least one dispersion stabilizer selected from the group consisting of herbicidal active ingredients, porous powders, surfactants and protective colloidal agents , and water . A herbicidal aqueous suspension preparation, wherein the content of the porous powder is 1 to 40 parts by weight in 100 parts by weight of the preparation (the invention of claim 1). ).

A herbicidal suspension preparation obtained by mixing at least one dispersion stabilizer selected from the group consisting of herbicidal active ingredients, porous powders, surfactants and protective colloidal agents, and water, and in 100 parts by weight of the preparation. Ru obtained by mixing a porous powder 1 to 40 parts by weight, and a herbicidal aqueous suspension concentrate (the invention of claim 2).

The herbicidal aqueous suspension preparation according to claim 1 or 2, wherein the porous powder has a phytotoxicity reducing effect (invention of claim 3).

The herbicidal aqueous suspension preparation according to any one of claims 1 to 3, wherein the porous powder is diatomaceous earth, porous cellulose, porous silica, porous ceramics, or porous calcium silicate (claimed). Item 4).

Any one of claims 1 to 4, wherein the herbicide active ingredient is at least one herbicide selected from the group consisting of benfresate, bromoxynil, bromoxynil, chloroxinil, diclobenil, iodobonyl, ioxynil, pyracronil and etofumesate. The herbicidal aqueous suspension preparation according to claim 5 was used (invention of claim 5).

The herbicidal aqueous suspension preparation according to any one of claims 1 to 4, wherein the herbicidal active ingredient is benfresate and / or pyracronyl (invention of claim 6).

In order to solve the above problems, it is a method for producing a herbicidal aqueous suspension preparation in which at least one dispersion stabilizer selected from the group consisting of herbicidal active ingredients, porous powders, surfactants and protective colloidal agents and water is mixed. The production method comprises a step of mixing 1 to 40 parts by weight of the porous powder in 100 parts by weight of the preparation (invention of claim 7).

In order to solve the above problems, a herbicidal aqueous suspension prepared by mixing at least one dispersion stabilizer selected from the group consisting of herbicidal active ingredients, porous powders, surfactants and protective colloidal agents and water is used. A method for reducing chemical damage sprayed on a paddy field under water, wherein the herbicidal aqueous suspension preparation is a herbicidal aqueous suspension preparation obtained by mixing 1 to 40 parts by weight of a porous powder in 100 parts by weight of the preparation. A method for reducing drug damage, which is characterized by the above (the invention of claim 8).
In the present invention, the porous powder is a powder having pores.

The effects of the herbicidal suspension preparation (flowable preparation, hereinafter also referred to as “the present preparation ” ) according to the present invention are as follows.
It is assumed that this preparation is sprayed on paddy fields under flooding and the chemical solution adheres to the leaves and stems of paddy rice.
In that case, the water content of the chemical solution on the leaf surface evaporates, and the herbicidal active ingredient is absorbed and adsorbed by the porous powder, and as the volume of water decreases, the herbicidal active ingredient is absorbed by the leaves and stems. Is hindered.
The herbicidal active ingredient absorbed and adsorbed by this porous powder and retained in the porous powder is prevented from coming into contact with leaves and stems, and together with the dried porous powder, it is blown from the leaf surface and the like. It is washed away due to rainfall and falls from the leaf surface.
Therefore, even if the herbicidal active ingredient adheres to the paddy rice, this preparation has the effect of reducing the phytotoxicity to the paddy rice, and by spraying this preparation on the paddy field under flooding, the phytotoxicity is reduced. Can be made to.
In addition, the physical action of the porous powder can reduce the phytotoxicity while reducing the impact on the environment without depending on the combination with the compound having the phytotoxicity-reducing effect.
Due to the physical action of the porous powder, the selectivity of the herbicide can be enhanced without being limited to the combination with a specific herbicide active ingredient, and the herbicide active ingredient to be used is not limited.
It is possible to provide a useful suspension-based preparation even in the case of a chemical solution in which the surface tension and the viscosity of the preparation are adjusted to atomize the herbicide designed for the preparation and the surface tension and the viscosity of the preparation do not function sufficiently.
Furthermore, even if the herbicide flowable is sprayed with a nozzle, phytotoxicity can be reduced.

Explanatory drawing showing the action and effect of this preparation according to the present invention, It is a detailed explanatory drawing which shows the action effect of this preparation.

The present formulation according to the present invention will be described in more detail below.
About herbicidal active ingredients The herbicidal active ingredients used in this formulation reduce phytotoxicity by the physical action of the porous powder as described above, so they are limited as long as they are generally used as active ingredients for pesticides. Well-known herbicidal active ingredients commonly used in the art can be widely used. Furthermore, two or more of these herbicidal active ingredients can be used in combination.
Such herbicidal active ingredient, as a nitrile herbicides such pyraclonil, Buromoboniru, bromoxynil, Kurorokishiniru, dichlobenil, Yodoboniru and ioxynil, as benzofuranyl alkylsulfonate herbicides such as benfuresate and ethofumesate, others such as phenoxy Acid-based, carbamate-based, acid-amide-based (butachlor, etc.), urea-based, sulfonylurea-based (pyrazosulflonethyl, etc.), pyrimidyloxybenzoic acid-based, triazine-based (simetrin, etc.), diazine-based, diazole-based, pipyridylium-based, dinitroaniline System, aromatic carboxylic acid system, fatty acid system, amino acid system, cyclohexanedione system, phenylphthalimide system, organic phosphorus system, cineole system, indandione system, benzofuran system, triazolopyrimidine system, oxadinone system, allyltriazolinone system, Examples thereof include isourazole, pyrimidinylthiophthalide, inorganic herbicides, and biological pesticides.
The specific herbicidal active ingredients contained in these are, for example, "Agricultural Chemicals Handbook 2011 Edition" (Japan Plant Protection Association), "SHIBUYA INDEX 17th Edition" (SHIBUYA INDEX Study Group), "The Pesticide Manual 16th". It is described in "Edition" (British Crop Protection Council) and the like.
The content of the herbicidal active ingredient in the preparation is not particularly limited, but is usually 0.01 to 60 parts by weight, preferably 0.1 to 50 parts by weight in 100 parts by weight of the preparation.

Porous powder The porous powder used in the present invention acts as a phytotoxicity reducing agent. Either a generally available industrial product or a pulverized product thereof may be used. Anything that has the effect of promoting the drying of this product adhering to the leaf surface, etc., and retaining the herbicide active ingredient, thereby inhibiting the absorption of the herbicide active ingredient into the leaves, etc. and reducing phytotoxicity. There is no particular limitation.
Examples of porous powders include natural ore materials such as diatomaceous earth, synthetic materials such as porous cellulose, porous silica, porous ceramics, porous calcium silicate, and porous polymers, wood flour, ogakuzu, and cellulose. Examples thereof include vegetable fine powders such as powder, microcrystalline cellulose, paddy shell powder, and coconut shell powder.
The particle size of the powder is not particularly limited as long as it can be stably dispersed in water, but 0.2 μm to 200 μm is desirable.
The optimum content depends on the reducing action of these powders, but the practical content in the formulation is 0.1 to 40 parts by weight, preferably 1 to 40 parts by weight, more preferably 1 to 20 parts by weight. It is a department.

Surfactants The types of surfactants that can be used in this formulation are not particularly limited as long as they have the effect of dispersing herbicidal active ingredients in this formulation, and are known surfactants commonly used in this field. The agent can be widely used.
Examples of such surfactants include nonionic surfactants, anionic surfactants, cationic surfactants and amphoteric surfactants, and these surfactants can also be used in combination.

Specific examples of the surfactant include polyoxyethylene alkyl ether, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, sucrose fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene resin acid ester, and polyoxyethylene fatty acid. Diester, polyoxyethylene alkylphenyl ether, polyoxyethylene dialkylphenyl ether, polyoxyethylene alkylphenyl ether formalin condensate, polyoxyethylene polyoxypropylene block polymer, alkylpolyoxyethylene polypropylene block polymer ether, polyoxyethylene alkylamine, Polyoxyethylene fatty acid amide, polyoxyethylene fatty acid bisphenyl ether, polyalkylene benzyl phenyl ether, polyoxyalkylene styrylphenyl ether, acetylene diol, polyoxyalkylene-added acetylene diol, polyoxyethylene ether type silicone, ester type silicone, fluorine-based Surfactants, nonionic surfactants such as polyoxyethylene castor oil, polyoxyethylene cured castor oil, alkyl sulfates, polyoxyethylene alkyl ether sulfates, polyoxyethylene alkylphenyl ether sulfates, polyoxyethylene styrylphenyl ethers Sulfates, alkylbenzene sulfonates, lignin sulfonates, alkylsulfosuccinates, naphthalene sulfonates, alkylnaphthalene sulfonates, formalin condensate salts of naphthalene sulfonic acid, formalin condensate salts of alkylnaphthalene sulfonic acid, Anionic surfactants such as fatty acid salts, polycarboxylic acid salts, N-methyl-fatty acid sarcosinates, resin salts, polyoxyethylene alkyl ether phosphates, polyoxyethylene alkyl phenyl ether phosphates, lauryl amine hydrochlorides, Cationic surfactants such as stearylamine hydrochloride, oleylamine hydrochloride, stearylamine acetate, stearylaminopropylamine acetate, alkyltrimethylammonium chloride, alkylamine salts such as alkyldimethylbenzalconium chloride, amino acid type or betaine type, etc. Androgynous surfactants and the like can be mentioned. Each of these surfactants can be used alone or in combination of two or more. It should be noted that the present invention is not limited to these examples.
The content of the above-mentioned surfactant is preferably 0.1 to 30 parts by weight in 100 parts by weight of the preparation, and more preferably 0.3 to 20 parts by weight in the preparation in consideration of its effect and economy.

About the protective colloidal agent The type of the protective colloidal agent that can be used in the present invention is not particularly limited as long as it has an action of dispersing the herbicide active ingredient in the present preparation. Known protective colloidal agents commonly used in the art can be widely used.
Then, Examples of such protective colloids include polyvinyl alcohols, gum arabic, gelatin, other albumins, methylcellulose, hydroxypropylmethylcellulose, water-soluble cellulose ethers such as hydroxyethyl cellulose, water-soluble soybean polysaccharide, A alginic acid Although there are sodium and the like, the present invention is not limited to these examples, and there is no problem even if one or more of these are used in combination.
The content of the protective colloid in the formulation is 0.01 to 20 parts by weight, preferably 0.1 to 10 parts by weight.

Other Ingredients In addition to the above ingredients, the following supplements can be added to this preparation as needed. Known auxiliary agents commonly used in the art can be widely used.
Auxiliary agents include, for example, ethylene glycol, diethylene glycol, propylene glycol, and glycerin as antifreeze agents, and water-soluble polymer compounds such as xanthan gum and carboxymethyl cellulose as thickeners, high-purity bentonite, white carbon, etc. other, grayed Agamu, welan gum, diutan gum, colloidal hydrous aluminum silicate, magnesium colloidal hydrous silicic acid, and colloidal hydrous aluminum magnesium silicate, etc., alkylbenzene as a high-boiling solvent, alkylnaphthalene, such as paraffinic hydrocarbons Mineral oils, esters such as adipic acid alkyl esters and phthalic acid alkyl esters, glycol ethers such as propylene glycol monomethyl ether, solvents such as 1-phenyl-1-xylylethane and 1-xysilyl-1,3-diphenylbutane, Examples include soybean oil, coconut oil, rapeseed oil, millet oil, sunflower oil, sunflower oil, and vegetable oils such as cottonseed oil. Antioxidants, ultraviolet inhibitors, crystal precipitation inhibitors and the like may be added as stabilizers for herbicidal active ingredients such as potassium, p-chloro-methoxylenol, butyl p-oxybenzoate, and proxylene.
The auxiliary agent that can be used in the present invention is not limited to the above example.

Preparation method of this preparation The preparation method of this preparation is not particularly limited, but can be prepared by, for example, the following method.
At least one dispersion stabilizer selected from the group consisting of herbicidal active ingredients, porous powders, surfactants and protective colloidal agents, and if necessary, other auxiliary agents are added to water and mixed. The herbicide active ingredient may be finely pulverized with a jet crusher or the like in advance and used, and at least one dispersion stabilizer selected from the group consisting of the herbicide active ingredient, a surfactant and a protective colloidal agent is required. Alternatively, it may be prepared by adding another auxiliary agent to water and then wet pulverizing using glass beads or the like. Further, the herbicide active ingredient may be prepared by dissolving it in a high boiling point solvent, and the viscosity of the preparation may be adjusted by adding a thickener or the like.

Usage of this product The product prepared as described above can be used , for example, by shaking the container from the ridge without diluting the drug with water and spraying it onto a flooded paddy field, or from the ridge using a spray device. A method of spraying on a flooded paddy field, a method of treating by placing it on the flow of inflow water from a water outlet, a method of attaching it to a rice transplanter and spraying it on a flooded paddy field, and a method of spraying it from the air to a flooded paddy field using a helicopter. There is a method of dripping and spraying. The present preparation may be diluted with water about 1.5 to 10 times and sprayed by the above method.
The amount of this preparation sprayed per 10a on a flooded paddy field is usually 0.1 to 3 liters, preferably 0.2 to 2 liters, and more preferably 0.3 to 1 liter.

The action and effect of this product when the product adheres to the rice body according to the above-mentioned usage mode of the product will be described with reference to FIG. FIG. 1 (1) is an explanatory diagram showing the action and effect of the present formulation according to the present invention, and FIG. 1 (2) shows the action of the herbicidal suspension preparation containing no porous powder on the rice leaf sheath. It is explanatory drawing which shows.
As shown in (A to C) of FIG. 1 (1), the porous powder absorbs the herbicide active component (solid drug-damaging component and liquid drug-damaging component) together with water to reduce the volume of water to be evaporated. It promotes the evaporation and drying of water, accelerates the solidification of this preparation, and inhibits the absorption of solid and liquid chemical-damaging ingredients into the rice body.
Furthermore, as shown in (C to D) of FIG. 1 (1), the solid and liquid chemical-damaging components held in the porous powder are prevented from coming into contact with the leaves and stems, and the present preparation is dried. As it progresses, it will be washed away by falling from the leaf surface, etc. together with the porous powder due to wind or rainfall.
FIG. 2 is a detailed view of the action and effect of the present preparation shown in FIG. 1 (1), and is an enlarged schematic view of the present preparation sprayed and adhered to the leaf surface of the rice body, and is porous. Two examples are illustrated with respect to the mode of the pores of the quality powder.
As shown in FIG. 2, in a state where the solid and liquid phytotoxic components of the phytotoxic components are held in the pores of the porous powder, the solidification of this preparation is accelerated and the phytotoxic components are transferred to the rice body. In addition to being inhibited from being absorbed, the phytotoxic components retained in the pores of the porous powder are prevented from coming into contact with the leaves and stems.

On the other hand, in the case of a drug containing no porous powder, as shown in (A'to C') of FIG. 1 (2), there is no medium for absorbing the water of the drug, and the evaporation of water due to drying is slow. Therefore, the phytotoxic components are easily absorbed by the rice leaf sheath.
Further, as shown in (C'to D'), as the drug dries, the phytotoxic components adhere to the leaf surface and the like, and are easily absorbed by the rice leaf sheath, resulting in death.

Hereinafter, the present invention will be specifically described based on Examples, but the present invention is not limited to these Examples.
In the following Examples and Comparative Examples, "part" means "part by weight".

[Example 1]
To 29.9 parts of water, 2 parts of polyvinyl alcohol and 0.1 part of xanthan gum are added and dissolved well, and 10 parts of benfresate is added thereto, and the mixture is emulsified and dispersed with TK homomixer MARK II (manufactured by Primix Corporation). (Liquid A)
Water 1 8 parts and mix well by adding porous cellulose 4 0 parts. (Liquid B)
Solution B was added to solution A and stirred well with Magellar Z (manufactured by Tokyo University of Science and Technology Co., Ltd.) to obtain a herbicidal aqueous turbid preparation.

[Example 2]
Water 4 8 parts mix well by adding kieselguhr 1 0 parts. (Liquid B)
Solution B was added to solution A of Example 1 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Example 3]
Of water 3 8 parts and mixed well by adding kieselguhr 2 0 parts. (Liquid B)
Solution B was added to solution A of Example 1 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Example 4]
Water 54 added to porous silica 1 0 parts 8 parts mix well. (Liquid B)
Solution B was added to solution A of Example 1 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Example 5]
Of water 3 8 parts by adding porous silica 2 0 parts and mixed well. (Liquid B)
Solution B was added to solution A of Example 1 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Example 6]
Water 5 added 5 parts of calcium silicate in 3 parts and mix well. (Liquid B)
Solution B was added to solution A of Example 1 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Example 7]
Water 5 7 parts and mixed well by adding a porous ceramic part. (Liquid B)
Solution B was added to solution A of Example 1 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Example 8]
Add 0.1 part of xanthan gum and 4 parts of polyoxyethylene alkyl ether to 29.9 parts of water and dissolve well. Four parts of pyracronyl are added thereto, and wet pulverization is performed using a dynomill KDL type (manufactured by Willy A. Bachofen AG) using hard glass beads. (Liquid A)
Water 4 2 parts mixed well by adding porous cellulose 2 0 parts. (Liquid B)
Solution B was added to solution A and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Example 9]
Water 5 7 parts and mixed well by adding diatomaceous earth 5 parts. (Liquid B)
Solution B was added to solution A of Example 8 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Example 10]
Water 5 2 parts mixed well by adding kieselguhr 1 0 parts. (Liquid B)
Solution B was added to solution A of Example 8 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Example 11]
Water 5 7 parts by adding porous silica 5 parts mix well. (Liquid B)
Solution B was added to solution A of Example 8 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Example 12]
Adding porous silica 1 0 parts of water 5 2 parts and mix well. (Liquid B)
Solution B was added to solution A of Example 8 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Example 13]
Water 5 9 parts by adding 3 parts of calcium silicate and mix well. (Liquid B)
Solution B was added to solution A of Example 8 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Example 14]
Add 1 part of porous ceramic to 1 part of water 6 and mix well. (Liquid B)
Solution B was added to solution A of Example 8 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Example 15]
Well dissolved by adding 2 parts of polyvinyl alcohol and xanthan gum 0.1 parts 29.9 parts of water, there benfuresate 1 0 parts added, emulsified and dispersed by a TK-homomixer MARK II (manufactured by PRIMIX Corporation). (Liquid A)
Water 2 0 parts to dissolve well by adding 4 parts of polyoxyethylene alkyl ether. Four parts of pyracronyl are added thereto, and wet pulverization is performed using a dynomill KDL type (manufactured by Willy A. Bachofen AG) using hard glass beads. (Liquid B)
Mix well by adding kieselguhr 1 0 parts of water 2 0 parts. (Liquid C)
Solution B and solution C were added to solution A and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Example 16]
Mix well by adding kieselguhr 2 0 parts of water 1 0 parts. (Liquid C)
Solution C was added to solutions A and B of Example 15 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Example 17]
Water 2 9 parts mixed well by adding a porous ceramic part. (Liquid C)
Solution C was added to solutions A and B of Example 15 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Example 18]
Add 5 parts of porous ceramic to 25 parts of water and mix well. (Liquid C)
Solution C was added to solutions A and B of Example 15 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Comparative Example 1]
The herbicidal aqueous suspension preparation was prepared in exactly the same manner as in Example 1 except that the porous cellulose was removed from the herbicidal aqueous suspension preparation of Example 1 and the amount of water added was adjusted so that the total amount of the preparation was 100 parts. Got

[Comparative Example 2]
4 1 part of the amount of the porous cellulose herbicidal aqueous suspension formulation of Example 1, except for adjusting the amount of water added so that the entire formulation is 100 parts, were prepared in the same manner as in Example 1 However, it gelled and a herbicidal suspension preparation could not be obtained.

[Comparative Example 3]
4 1 part of the amount of diatomite herbicidal aqueous suspension formulation of Example 1, except for adjusting the amount of water added so that the entire formulation is 100 parts, was prepared in the same manner as in Example 1, It solidified and a herbicidal suspension preparation could not be obtained.

[Comparative Example 4]
The herbicidal aqueous suspension preparation was prepared in exactly the same manner as in Example 8 except that the porous cellulose was removed from the herbicidal aqueous suspension preparation of Example 8 and the amount of water added was adjusted so that the total amount of the preparation was 100 parts. Got

[Comparative Example 5]
Prepared in exactly the same manner as in Example 8 except that the amount of the porous ceramic of the herbicidal aqueous suspension of Example 8 was adjusted to 0.9 parts and the amount of water added was adjusted so that the total amount of the preparation was 100 parts. A herbicidal suspension preparation was obtained.

[Comparative Example 6]
4 1 part of the amount of the porous cellulose herbicidal aqueous suspension formulation of Example 1, except for adjusting the amount of water added so that the entire formulation is 100 parts, were prepared in the same manner as in Example 1 However, it solidified and a herbicidal suspension preparation could not be obtained.

[Comparative Example 7]
4 1 part of the amount of diatomite herbicidal aqueous suspension formulation of Example 1, except for adjusting the amount of water added so that the entire formulation is 100 parts, was prepared in the same manner as in Example 1, It solidified and a herbicidal suspension preparation could not be obtained.

[Comparative Example 8]
A herbicidal suspension preparation was prepared in exactly the same manner as in Example 15 except that diatomaceous earth was removed from the herbicidal aqueous suspension preparation of Example 15 and the amount of water added was adjusted so that the total amount of the preparation was 100 parts. It was.

[Comparative Example 9]
Added 3 parts of urea in water 2 7 parts and mix well. (Liquid C)
Solution C was added to solutions A and B of Example 15 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Comparative Example 10]
Add 5 parts of lactic acid to 25 parts of water and mix well. (Liquid C)
Solution C was added to solutions A and B of Example 15 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Comparative Example 11]
Water 2 0 parts and mixed well by adding talc 1 0 parts. (Liquid C)
Solution C was added to solutions A and B of Example 15 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Comparative Example 12]
Water 2 0 parts and mixed well by adding a hydrophobic silica gel 1 0 parts. (Liquid C)
Solution C was added to solutions A and B of Example 15 and stirred well with Magellar Z to obtain a herbicidal aqueous turbid preparation.

[Comparative Example 13]
Thoroughly stirred at Mazera Z Example 15 A liquid and B liquid acrylic emulsion (solid content 50%) in addition to 2 0 parts, to obtain a herbicidal aqueous suspension formulation.

[Comparative Example 14]
Thoroughly stirred at Mazera Z Example 15 A solution with the urethane emulsion (solid content 50%) to Solution B in addition to 2 0 parts, to obtain a herbicidal aqueous suspension formulation.

[Comparative Example 15]
Thoroughly stirred at Mazera Z in liquids A and B of Example 15 ester gum emulsion (50% solids) by adding 2 0 parts, to obtain a herbicidal aqueous suspension formulation.

Adhesive phytotoxicity test A pot of 100 cm ² was filled with paddy soil, and 2 strains of paddy rice in the 1-1.8 leaf stage were transplanted as 3 strains, and the inundation depth was about 3 cm. After transplanting paddy rice, the present preparation of each of the above examples and the preparation of each comparative example are sprayed on the entire strain with an airbrush.
The amount of the present preparation of each example and the herbicidal turbid preparation of each comparative example used was approximately 0.001 cc to 0.03 cc.
After 14 days in the greenhouse (water temperature is about 15 ° C., which is a temperature at which chemical damage is likely to occur), the degree of adhesive chemical damage such as browning of the rice body was evaluated by the evaluation criteria shown in Table 1. The results are shown in Tables 2 and 3.

Evaluation criteria for phytotoxicity test As shown in Table 1, the evaluation criteria are divided into four levels, and the corresponding degree of phytotoxicity is "none", "slight" phytotoxicity, "mild browning symptom / growth suppression", phytotoxicity ""Strong growth suppression / death".

As shown in Table 2, each herbicidal aqueous suspension preparation of Examples 1 to 18 containing 1 to 40 parts by weight of the porous powder in 100 parts by weight of the preparation is shown in Comparative Examples 1 to 15 of Table 3. Compared with the herbicidal aqueous suspension containing no porous powder and the herbicidal aqueous suspension in which the content of the porous powder exceeds the range shown in Examples 1 to 18, the effect of reducing chemical damage is remarkably exhibited. It became clear that there was.
Further, as shown in Comparative Examples 2, 3, 6, and 7 in Table 3, it was found that the upper limit of the content of the porous powder is limited depending on the porous powder.

As described above, the herbicidal aqueous suspension preparation of the present invention exerts a physical action on the phytotoxic component without depending on the combination with the compound having the phytotoxicity reducing effect, and has an effect on the environment. It is possible to provide a completely new type of herbicidal aqueous suspension preparation, a method for producing the same, and a method for reducing the phytotoxicity caused by the preparation, which can reduce the phytotoxicity while reducing the amount.

Claims (6)

Herbicidal active ingredient,
Porous powder,
A herbicidal suspension formulation containing at least one dispersion stabilizer and water selected from the group consisting of surfactants and protective colloidal agents.
The porous powder is diatomaceous earth, porous cellulose, porous silica, porous ceramics, or porous calcium silicate.
The herbicidal active ingredient contains benfresate and / or pyracronyl, and the content of the diatomaceous earth, porous cellulose, porous silica, porous ceramics, or porous calcium silicate is contained in 100 parts by weight of the preparation. A herbicidal aqueous suspension preparation characterized by 1 to 40 parts by weight. Herbicidal active ingredient,
Porous powder,
A herbicidal suspension preparation obtained by mixing at least one dispersion stabilizer selected from the group consisting of a surfactant and a protective colloidal agent and water.
The porous powder is diatomaceous earth, porous cellulose, porous silica, porous ceramics, or porous calcium silicate.
Diatomaceous earth, porous cellulose, porous silica, porous ceramics, or porous silicic acid, wherein the herbicidal active ingredient contains benfresate and / or pyracronyl and is 1 to 40 parts by weight in 100 parts by weight of the preparation. A herbicidal suspension preparation obtained by mixing calcium . The herbicidal aqueous suspension preparation according to claim 1 or 2, wherein the porous powder is porous cellulose or porous calcium silicate . The herbicidal aqueous suspension preparation according to any one of claims 1 to 3 , further comprising a thickener . Herbicidal active ingredient,
Porous powder,
A method for producing a herbicidal suspension preparation in which at least one dispersion stabilizer selected from the group consisting of a surfactant and a protective colloidal agent and water is mixed.
The porous powder is diatomaceous earth, porous cellulose, porous silica, porous ceramics, or porous calcium silicate.
Diatomaceous earth, porous cellulose, porous silica, porous ceramics, or porous silicic acid, wherein the herbicidal active ingredient contains benfresate and / or pyracronyl and is 1 to 40 parts by weight in 100 parts by weight of the preparation. A manufacturing method comprising the step of mixing calcium . Herbicidal active ingredient,
Porous powder,
A method for reducing phytotoxicity by spraying a herbicidal suspension prepared by mixing at least one dispersion stabilizer selected from the group consisting of a surfactant and a protective colloid and water on a flooded paddy field.
The porous powder is diatomaceous earth, porous cellulose, porous silica, porous ceramics, or porous calcium silicate.
The herbicidal active ingredient contains benfresate and / or pyracronyl, and the herbicidal aqueous suspension preparation is 1 to 40 parts by weight in 100 parts by weight of the preparation diatomaceous earth, porous cellulose, porous silica, porous. A method for reducing chemical damage, which is a herbicidal aqueous suspension preparation obtained by mixing quality ceramics or porous calcium silicate .