JP2002179507A - Uniformly dispersible granular agrochemical preparation and method for spraying the same preparation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To establish uniformly dispersible granular agrochemical preparation, premised on local spraying, having good dispersibility of a agrochemical active ingredient and capable of obtaining desired agrochemical treating effect even when algae, etc., are blown together and water surface of paddy field, etc., is covered by algae, etc., and a method for spraying the preparation. SOLUTION: This uniformly dispersible granular agrochemical preparation comprises an agrochemical active ingredient and has a particle size distribution in which particles having >=3 mm particle diameter occupy 80% and property floating on water surface and disintegrates on the water surface within 30 min. This method for spraying uniformly dispersible granular agrochemical preparation comprises spraying the preparation over an area of 5% to 50% based on total paddy field area at distance separated by >=1 m from levee of paddy field under flooding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a granular pesticide formulation capable of uniformly dispersing an active pesticide component by, for example, partially directly spraying it on a water surface of a paddy field or the like, and a method of spraying the same.

[0002]

2. Description of the Related Art Conventionally, pesticide preparations used in paddy fields and the like include:
Granules, dusts, emulsions, wettable powders, and flowables are common. Among these pesticide preparations, granules and dusts are usually sprayed directly without diluting 3 to 4 kg per 10 ares, but in recent years, labor saving of the spraying of pesticides has been called for. For this reason, studies have been made to increase the content of the pesticidal active ingredient in the formulation to reduce the amount of application as a formulation, or to investigate an agricultural chemical formulation that can be applied simply by throwing from a ridge without entering a paddy field.

[0003] In response to such demands, various pesticide formulations have been studied, and the techniques have been disclosed. For example, pesticide active ingredients are dissolved or dispersed in a waxy substance having a specific gravity of 1 or less and coated or contained in a water-soluble extender (JP-A-55-154902, JP-A-56-3090).
No. 1, JP-A-7-101805), a composition in which a bactericidal component is supported on a water-floating carrier such as pumice or perlite (Japanese Patent Publication No. 48-1179), and an insecticidal component using paraffin with a paraffin petroleum resin or the like. A composition in which a herbicidal component is carried on an inorganic carrier floating on water such as perlite (Japanese Patent Publication No. 48-1181).
No. 1182), a granular pesticide formulation in which a pesticide active ingredient and a water-repellent substance are supported on a mineral particulate carrier having a mesh size of 48 mesh or less (JP-A-48-56831), and a pesticide is formed into a hollow body having a specific gravity of 1 or less and a particle size of 5 mm or less. JP-A-58-65203 discloses a composition in which an active ingredient is supported and molded.

However, in all of the above pesticide preparations, the waxy substance containing the pesticide active ingredient and the grain nucleus carrying the pesticide active ingredient float on the surface of the water for a long time. There was a problem that concentration unevenness occurred, resulting in insufficient medicinal effects and phytotoxicity.

Further, pesticidal active ingredients and specific surfactants,
A composition containing bentonite and water-suspendable hollow particles (Japanese Patent Laid-Open No. 7-82102), a pesticide active ingredient and 250 μm
A composition containing the following vitreous hollow body and a specific surfactant (Japanese Patent Application Laid-Open No. 6-345603) is disclosed. It is necessary to be 2 mm or less, and it is affected by the wind at the time of spraying and causes trouble. Further, a water-floating granule having a particle size of 1 mm to 5 mm as a composition comprising a pesticidal active ingredient, a powder base having a specific gravity of 1 or less, and a surfactant having specific properties has been disclosed (Japanese Patent Laid-Open No. 7-1995). No. 233002), which has a specific gravity of 1
Since the following powder bases have a large amount of compounding and are brittle, there has been a problem that the sprayer may be exposed to pesticides or fly to the surrounding environment when spraying.

Further, JP-A-6-336403 discloses a composition comprising a water-soluble film containing a formulation containing an agricultural chemical active ingredient and calcined vermiculite or expanded perlite, expanded shirasu, cork and an acetylene surfactant. ing. This product has very low compressive collapse strength due to the large amount of calcined vermiculite or expanded perlite, expanded shirasu, and cork for imparting water surface floatability, and when sprayed directly on paddy fields, it is exposed to pesticides and affects the surrounding environment. Therefore, it is assumed that it is packaged and thrown into a water-soluble film. Preparations packaged in such a water-soluble film, so-called jumbo agents, are usually
It is a formulation that throws several to about 20 from paddy fields per 10a from the ridge, and enables labor-saving pesticide spraying. In fact, sufficient diffusion of pesticide components cannot be obtained in the paddy fields that cover the area, and the desired effect cannot be obtained.

[0007]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems of the conventionally provided agricultural chemical preparations. For example, a state in which algae and the like are blown to cover the water surface of a paddy field or the like. The challenge is to establish a uniform diffusible granular pesticide formulation and a method for dispersing the formulation, assuming local application with good diffusion of the pesticide active ingredient and the desired effect of pesticide treatment. It is assumed that.

[0008]

DISCLOSURE OF THE INVENTION The present inventors have conducted intensive studies on water-suspendable granular preparations for uniformly dispersing an agricultural chemical active ingredient, and particularly on suitable physical properties thereof. It has been found that the above-mentioned problems can be solved by setting the target properties in a specific range, and the present invention has been completed.

[0009] That is, the present invention relates to a composition containing a pesticidal active ingredient, having a particle size of 3 mm or more, having a particle size distribution of 80% or more and a property of floating on the water surface, and disintegrating on the water surface within 30 minutes. The present invention provides a homogeneously diffusible granular pesticide preparation characterized by the following.

[0010] The present invention also provides a pesticidal active ingredient having a particle size distribution of 80% or more of particles having a particle size of 3 mm or more and a property of floating on the water surface, and a uniform material which disintegrates on the water surface within 30 minutes. Provided is a method for dispersing a uniform diffusible pesticide formulation in which the diffusible particulate pesticide formulation is spread and spread over an area of 5% to 50% of the total paddy field at a distance of at least 1 m from the levee of a flooded paddy field. Things.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present specification, "uniform diffusivity" means a part of the area of the water surface to be sprayed, for example, 5% to 50% of the area of the water surface. Later, it refers to a state in which the active ingredient is substantially uniformly diffused throughout the area to be sprayed.

The homogeneously diffusible granular pesticide preparation of the present invention (hereinafter, referred to as
The pesticidal active ingredient that can be used as a raw material in the "diffusible granular preparation") is not particularly limited as long as it is generally used as a pesticide, and can be used in either solid or liquid form. Further, the pesticidal active ingredient may be hardly soluble or easily soluble in water.For example, herbicides, fungicides, insecticides, plant growth regulators are used, and particularly useful pesticidal active ingredients in water application. It is suitable.

Examples of the pesticidal active ingredient used in the present invention include, but are not limited to, herbicides, fungicides, insecticides, plant growth regulators, and the like.

Among these pesticidal active ingredients, specific examples of herbicides include, for example, 2,4,6-trichlorophenyl-4'-nitrophenyl ether (CNP) and 2-methyl-4-chlorophenoxythiol. -S-ethyl acetate (phenothiol), α- (2-naphthoxy) propionanilide (naproanilide), methyl 5- (2,4-dichlorophenoxy) -2-nitrobenzoate (bifenox), S- (4-chloro) Benzyl) N, N-diethylthiocarbamate (benthiocarb), S-benzyl =
1,2-dimethylpropyl (ethyl) thiocarbamate (esprocarb), S-ethylhexahydro-1H-
Azepine-1-carbothioate (Molinate), S-
1-methyl-1-phenylethyl piperidine-1-carbothioate (dimipeperate), O-3-ter
t-butylphenyl = 6-methoxy-2-pyridyl (methyl) thiocarbamate (pyributicarb), 2-
Chloro-2 ', 6'-diethyl-N- (butoxymethyl)
Acetanilide (butachlor), 2-chloro-2 ',
6'-diethyl-N- (2-propoxyethyl) acetanilide (pretilachlor), (RS) -2-bromo-N- (α, α-dimethylbenzyl) -3,3-dimethylbutylamide (bromobutide), 2-benzothiazo- Ru-2-yloxy-N-methylacetanilide (mefenacet), 1- (α, α-dimethylbenzyl) -3-
(Balatril) urea (Dimron), methyl = α-
(4,61-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -O-toluate (bensulfuronmethyl), 1- (2-chloroimidazo [1,2-a] pyridin-3-ylsulfonyl)- 3- (4,6-dimethoxypyrimidin-2-yl) urea (imazosulfuron), ethyl = 5- (4,6-dimethoxypyrimidine-
2-ylcarbamoylsulfamoyl) -1-methylpyrazol-4-carboxylate (pyrazosulfuronethyl), 2-methylthio-4,6-bis (ethylamino)
-S-triazine (simethrin), 2-methylthio-
4,6-bis (isopropylamino) -s-triazine (promethrin), 2-methylthio-4-ethylamino-6- (1,2-dimethylpropylamino) -s-triazine (dimetamethrin), 2,4-dichlorophenyl -3'-methoxy-4'-nitrophenyl ether (chromomethoxynil), 5-tert-butyl-3- (2,
4-dichloro-5-isopropoxyphenyl) -1,3,
4-oxadiazolin-2-one (oxadiazon),
4- (2,4-dichlorobenzoyl) -1,3-dimethyl-5-pyrazolyl-P-toluenesulfonate (pyrazolate), 2- [4- (2,4-dichlorobenzoyl)
[1,3-dimethylpyrazol-5-yloxy] acetophenone (pyrazoxifene), (RS) -2-
(2,4-dichloro-m-tolyloxy) propionanilide (chromeprop), 2- [4- [2,4-dichloro-m-toluoyl) -1,3-dimethylpyrazol-5-yloxy] -4'- Methyl acetophenone (benzophenap), S, S'-dimethyl 2-difluoromethyl-4-isobutyl-6-trifluoromethylpyridine-3,5-dicarbothioate (dithiopyr), 2
-Chloro-N- (3-methoxy-2-thenyl) -2 ',
6'-dimethylacetanilide (tenylchlor), n
-Butyl- (R) -2- [4- (2-fluoro-4-cyanophenoxy) phenoxy] propionate (cyhalofop-butyl), 3- [1- (3,5-dichlorophenyl) -1-methyl Ethyl] -2,3-dihydro-6-methyl-5-phenyl-4H-1,3-oxazine-4-
On (oxadichromemephone), 3- (4-chloro-5-
Cyclopentyloxy-2-fluorophenyl) -5-isopropylidene-1,3-oxazolidine-2,4-dione (pentoxazone), 1- (diethylcarbamoyl)
-3- (2,4,6-trimethylphenylsulfonyl)
-1,2,4-triazole (cafentrol), N
-{[(4,6-dimethoxypyrimidin-2-yl) aminocarbonyl]}-1-methyl-4- (2-methyl-2H-tetrazol-5-yl) (azimsulfuron), methyl 2-[( 4,6-dimethoxypyrimidin-2-yl) oxy] -6-[(E) -1- (methoxyimino) ethyl] benzoate (pyriminobac-methyl) and the like.

[0015] Specific examples of fungicides include O, O-
Diisopropyl-S-benzylthiophosphate (I
BP), 3'-isopropoxy-2-methylbenzanilide (mepronil), α, α, α-trifluoro-3'-
Isopropoxy-O-toluanilide (flutranil),
3,4,5,6-tetrachloro-N- (2,3-dichlorophenyl) phthalamic acid (teclophthalam), 1- (4
-Chlorobenzyl) -1-cyclopentyl-3-phenylurea (pencyclone), 6- (3,5-dichloro-4)
-Methylphenyl) -3 (2H) -pyridazinone (dicromedin), methyl = N- (2-methoxyacetyl)-
N- (2,6-xylyl) -DL-alaninate (metalaxyl), (E) -4-chloro-α, α, α-trifluoro-N- (1-imidazole-1-yl-2-propoxy) Ethylidene) -o-toluidine (triflumiso-
), Kasugamycin, validamycin, 3-allyloxy-1,2-benzisothiazol-1,1-dioxide (probenazole), diisopropyl-1,3-dithiolan-2-ylidene-malonate (isoprothiolane), 5-methyl -1,2,4-triazolo [3,4-
b] benzothiazole (tricyclazole), 1,2,
5,6-tetrahydropyrrolo [3,2,1-ij] quinolin-4-one (pyroquilon), 5-ethyl-5,8-dihydro-8-oxo [1,3] dioxolo [4,5-g]
Quinoline-7-carboxylic acid (oxolinic acid),
(Z) -2′-methylacetophenone = 4,6-dimethylpyrimidin-2-ylhydrazone 4,5,6,7-tetrachlorophthalide (ferimzone), 3- (3,5-dichlorophenyl) -N-isopropyl -2,4-dioxoimidazolidin-1-carboxamide (iplodione)
And the like.

Further, specific examples of insecticides include O, O-
Dimethyl-O- (3-methyl-4-nitrophenyl) thiophosphate (MEP), (2-isopropyl-4-
Methylpyrimidyl-6) -diethylthiophosphate (diazinone), 1-naphthyl-N-methylcarbamate (NAC), O, O-diethyl-O- (3-oxo-2-phenyl-2H-pyridazine- 6-yl) phosphorothioate (pyridafenthion), O, O-dimethyl-O-3,5,6-trichloro-2-pyridylphosphorothioate (chloropyrifosmethyl), dimethyldicarbethoxyethyldithiophosphate (marathon), O,
O-dimethyl-S- (N-methylcarbamoylmethyl)
Dithiophosphate (dimethoate), O, O-dipropyl-O-4-methylthiophenylphosphate (propaphos), O, S-dimethyl-N-acetylphosphoramidothioate (acephate), ethyl Paranitrophenylthionobenzenephosphonate (EPN), 2-secondary-butylphenyl-N-methylcarbamate (BPMC), 2,3-dihydro-2,2-dimethyl-7
-Benzo [b] furanyl = N-dibutylaminothio-N
-Methylcarbamate (carbosulfan), ethyl =
N- [2,3-dihydro-2,2-dimethylbenzofuran-7-yloxycarbonyl (methyl) aminothio]-
N-isopropyl-β-alaninate (benflacarb), (RS) -α-cyano-3-phenoxybenzyl = (RS) -2,2-dichloro-1- (4-ethoxyphenyl) cyclopropanecarboxylate (Cycloprothrin), 2- (4-ethoxyphenyl) -2-methylpropyl = 3-phenoxybenzyl = ether (ethofenbrox), 1,3-bis (carbamoylthio)
-2- (N, N-dimethylamino) propane hydrochloride (cartap), 5-dimethylamino-1,2,3-trithiane oxalate (thiocyclam), S, S'-2-dimethylaminotrimethylene = Di (benzenethiosulfonate)
(Bensultap), 2-tert-butylimino-
3-isopropyl-5-phenyl-1,3,5,6 tetrahydro-2H-1,3,5-thiadiazin-4-one (buprofezin) and the like. Specific examples of the plant growth regulator include 4 ′ -Chloro-2 '-(α-hydroxybenzyl) isonicotinanilide (inabenfide), (2R
S, 3RS) -1- (4-Chlorophenyl) -4,4-dimethyl-2- (1H-1,2,4-triazol-1-yl) pentan-3-ol (paclobutrazol) ,
(E)-(S) -1- (4-chlorophenyl) -4,4
-Dimethyl-2- (1H-1,2,4-triazole-1
-Yl) penta-1-en-3-ol (uniconazole) and the like.

The above pesticidal active ingredients can be used alone or in combination of two or more. The total of the mixing ratio of these pesticide active ingredients is usually about 0.1 to 70 parts by weight, preferably about 1 to 50 parts by weight, more preferably about 1 to 50 parts by weight, based on 100 parts by weight of the composition. Is from 2 to 25 parts by weight.

In the diffusible granular preparation of the present invention, it is desirable to add a surfactant in order to disintegrate the granules on the surface of the water within 30 minutes and to diffuse the pesticidal active ingredient into water. Surfactants that can be used include those commonly used in agricultural chemical formulations.

Specific examples of the surfactant include polyethylene glycol higher fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene aryl phenyl ether, sorbitan monoalkylate, acetylene alcohol and acetylene diol. Nonionic surfactants such as alkylene oxide adducts, alkylaryl sulfonates, dialkyl sulfonates, lignin sulfonates, naphthalene sulfonates and condensates thereof, alkyl sulfates, alkyl phosphates , Alkylaryl sulfates, alkylaryl phosphates, polyoxyethylene alkyl ether sulfates, polyoxyethylene alkyl arylates Sulfates, polyoxyethylene aryl phenyl ether sulfate, an anionic surfactant such as a polycarboxylic acid type polymer active agent,
Further, there may be mentioned a silicone-based surfactant and a fluorine-based surfactant. The liquid surfactant may be used by adsorbing on a solid carrier such as white carbon, diatomaceous earth, and urea. These surfactants can be used alone or in combination of two or more.

The mixing ratio of these surfactants is usually from 0.1 to 30 parts by weight, preferably from 0.5 to 20 parts by weight, more preferably from 2 to 100 parts by weight, per 100 parts by weight of the composition. It is 10 parts by weight to 10 parts by weight.

It is essential that the diffusible granular preparation of the present invention floats on the water surface. As a method of imparting water surface floatability to this diffusible granular preparation, for example, perlite made of perlite or obsidian, foamed shirasu made of shirasu, phyllite fired with an aluminosilicate system, sodium silicate or borax was foamed Microballoons, pumice, granular diatomaceous earth, granular activated carbon, wood flour, cork powder, kenaf pieces, phenolic microballoons made of phenolic resin, ecosphere made of epoxy resin, polyurethane foam made of polyurethane, microsphere made of polyacrylonitrile, thermal power A method for containing a floating carrier having one or more independent air chambers, such as fly ash produced as ash during power generation, and a method for containing a water-repellent substance such as stearic acid and a salt thereof, and hydrophobic white carbon. But the former independence One or method of incorporating the floating support having a plurality of air chambers has is more preferable.

The amount of the floating carrier or the water-repellent substance is not particularly limited as long as the diffusible granular preparation can obtain a water surface floating property. Since the amount of generated dust is undesirably increased, it is desirable to mix the minimum necessary amount. For this reason, the upper limit of the amount of the buoyant carrier and the like is generally limited to the formulation 10
It is up to about 30 parts by weight per 0 parts by weight, generally less than 20 parts by weight, preferably less than 15 parts by weight. The lower limit is 0.3 parts by weight, and preferably 0.5 parts by weight or more.

Further, in the diffusible granular preparation of the present invention,
In order to enhance the effect of the above-mentioned floating carrier, it is desirable to include water in the preparation. The mixing amount of this water is
0.3 to 6 parts by weight, preferably 0.3 parts by weight per 0 parts by weight.
About 5 to 5 parts by weight, more preferably 0.8 to 3 parts by weight.
It is about parts by weight. If the water is less than 0.3 parts by weight,
Since the structure is such that water easily penetrates into the formulation, once the formulation is poured into water, it temporarily floats on the water surface, but then the air inside the formulation may fall out and settle out. A carrier must be included, which is not preferred. When the amount of water is 6 parts by weight or more, the preparation becomes brittle,
It is not preferable because fine powder may be generated at the time of spraying.

In the diffusible granular preparation of the present invention, water may be contained by a method of once drying the preparation and then adding it by spraying, or by drying while measuring the water content to obtain a predetermined amount. There is a method of terminating the drying when the water content reaches the above, but there is no particular limitation. Incidentally, the content of water in the diffusible granular preparation of the present invention,
For example, it can be measured using a Karl Fischer-type moisture meter or an infrared moisture meter.

Further, in the present invention, a solid carrier is usually blended. As the solid carrier, a water-soluble carrier or a water-insoluble carrier can be used, and these can be used in combination. Water-soluble carriers include, for example, ammonium sulfate, ammonium bicarbonate, ammonium nitrate, ammonium chloride, potassium chloride, sodium sulfate, magnesium sulfate, sodium citrate, sodium carbonate,
Organic or inorganic acid salts such as sodium hydrogen carbonate, organic acids such as citric acid and succinic acid, sugars such as sucrose and lactose, urea and the like can be mentioned. In addition, the water-insoluble carrier is generally a mineral fine powder, for example, clays, calcium carbonate, bentonite, talc, diatomaceous earth,
Examples thereof include calcium stearate and white carbon. The mixing ratio of these solid carriers is as follows:
The amount is usually 5 parts by weight to 80 parts by weight, preferably 10 parts by weight to 70 parts by weight with respect to 00 parts by weight.

In the present invention, auxiliary agents are added as necessary as other components. Examples of the optional auxiliary agent include a binder and an organic solvent. Binders that can be used are those commonly used in pesticidal granular compositions, and water-soluble substances are preferred. Examples of the binder include carboxymethylcellulose sodium salt, dextrin, water-soluble starch, xanthan gum, guar seed gum, sucrose, polyvinylpyrrolidone, polyvinyl alcohol, sodium polyacrylate, polyethylene glycol having an average molecular weight of 6,000 to 20,000, and an average molecular weight of 100,000. Up to 5,000,000 polyethylene oxides. The mixing ratio of these binders is usually from 0.01 to 10 parts by weight, preferably from 0.1 to 6 parts by weight, based on 100 parts by weight of the composition.

Further, when the agricultural chemical active ingredient is dissolved or dispersed, an organic solvent is used. As the organic solvent, for example, dioctyl phthalate, methyl naphthalene, alkyl pyrrolidone, phenyl xylyl ethane,
Glycerin, alkylene glycol, machine oil, methane series hydrocarbons, fatty acid esters, polybasic acids, coconut oil, soybean oil, rapeseed oil, silicone oil and the like can be used, but high boiling solvents are preferred. The mixing ratio of these organic solvents is usually 10 to 200 parts by weight with respect to the pesticidal active ingredient.

The diffusible granular preparation of the present invention is generally a granular preparation containing the above-described components and floating on the water surface. When adjusted, the water is adjusted so that it collapses within 30 minutes. If the time required for collapse exceeds 30 minutes,
It is not preferable because the formulation is blown by the wind. In order to further reduce the influence of the blowing, when the formulation floats on the water surface, the above-mentioned components are mixed so that the portion exposed on the water surface is 40% or less, preferably 20% or less of the whole formulation. It is desirable to adjust the amount.

The method for producing the diffusible granular preparation of the present invention that satisfies the above conditions is not particularly limited.
After mixing all the raw materials except for water, it is preferable to add water to the mixture, knead the mixture, and extrude from a plate having a hole of a predetermined size to perform granulation. The granulated material is formed by a method of cutting the granulated material to an appropriate length, giving rolling motion to the cut granulated material, and stopping the movement when the surface becomes smooth. In this case, the ratio of the minor axis to the major axis of one grain is preferably 1 to 3. The shaped granules are dried so that the water content is in the range of 0.3 to 6 parts with respect to 100 parts by weight of the preparation, or after the shaped granules are completely dried, Water may be sprayed and added to the mixture in an amount of 0.3 to 6 parts with respect to 100 parts by weight of the preparation to obtain the uniformly diffusible granular pesticide preparation of the present invention.

Preferred examples of the diffusible granular preparation of the present invention include, for example, an active ingredient having an effect of being applied to the surface of water, having an average particle size of 4 mm to 10 mm, a specific gravity of 1 or less, and After spraying, those that disintegrate in 1 to 20 minutes can be mentioned.

As described above, it is essential that the diffusible granular preparation of the present invention contains more than 3 mm or more of particles, more preferably about 3 to 20 mm, especially 4 to It is preferable to include more than about 10 mm. By making the formulation the above particle size,
Even when the diffusible granular preparation of the present invention is sprayed from the ridge,
5% to 50% of the total paddy area at a distance of 1m or more from the ridge
Can be easily obtained. The secondary effect of making the particle size 3 mm or more is that the particle size is usually about 0.8 mm, which can be easily distinguished from the granules applied to the paddy rice nursery box, so that misuse can be prevented. Can be mentioned. Even if the rice seedling box is treated and misused is noticed, only the preparation of the present invention floats on the water surface by immersing the seedling box in water, so that damage due to misuse can be minimized.

The diffusible granular preparation of the present invention described above is
There is no particular limitation on the method of spraying on the water surface such as a paddy field, but, for example, a method of throwing the preparation with vinyl gloves and holding it by hand, using a power spraying machine, a method of spraying by continuously discharging from the jet head, Alternatively, the shutter lever can be opened and closed instantly, sprayed intermittently, sprayed with a ladle, shaken and thrown into a cylindrical container, using a hand-operated granulator, or even a radio control A method using a helicopter to scatter in a streak shape or in a spot manner may be used.

[0033]

[Effect] In rice cultivation in paddy fields, in the case of so-called early cultivation, where transplantation is early, even if a pesticide formulation having a water-floating surface is locally applied within a period of one to two weeks after transplantation, the generation of algae in the paddy field does not occur. Indispensable, the diffusibility of the pesticidal active ingredient is good, and the desired effect can be obtained. However, in the so-called normal season cultivation in which the transplanting time is after May, the water temperature rises, and it is common that algae are generated at the appropriate time of pesticide spraying,
Because this algae significantly inhibits the diffusion of pesticidal active ingredients,
In many cases, the desired pesticide effect cannot be obtained. In particular, when the algae were blown by the wind, when the pesticide formulation having a water-floating surface was locally applied to the paddy field, the area where the algae were blown was
The fact is that the effects of pesticides can hardly be obtained. Also, several weeks after transplantation, the growth of the paddy rice progresses, and even when the pesticide formulation having a water-floating surface is locally applied after the strain grows, diffusion of the pesticide active ingredient is hindered. As described above, the labor-saving application formulation on the premise of local application has conventionally been an application applied when the rice strain is small.

On the other hand, the diffusible granular preparation of the present invention
In a paddy field where algae have been generated, or even in a paddy field where rice plants have grown to a certain extent, the diffusion of the pesticide active ingredient is good, and it can be said that this is a granular pesticide formulation with a water-floating surface that can obtain the intended effect of the pesticide. By spraying the object at a specific position in a paddy field and within a specific area, it is possible to uniformly spray the pesticide active ingredient without substantially hindering labor saving at the time of spraying the pesticide. That is, the diffusible granular preparation of the present invention in which the particle diameter of 3 mm or more is 80% or more, floats on the water surface, and disintegrates on the water surface within 30 minutes is 1 m or more from the ridge of the paddy rice field under flooding. 5% to 5% of the total paddy area at a distance, preferably 2m or more from the ridge
By dispersing and spraying on an area of 0%, preferably 10% to 50%, the pesticidal active ingredient can be evenly dispersed in the paddy field.

There is no problem if the diffusible granular preparation of the present invention is applied to 50% or more of the total paddy area, but it is meaningless for the purpose of labor-saving pesticide application, and the area of 50% or less is not significant. It is desirable to spray. Also, JP-A-7-23
No. 3002 describes only that it was possible to inject a water-floating granule having a particle size of 1 mm to 5 mm from the levee of a paddy field, but this description lacks specificity and is described in the present invention. It is not completely clear whether uniform diffusion was achieved. Furthermore, of course, paddy fields without algae,
Even in a paddy field before transplantation or in a paddy field where the rice plant is small, the diffusible granular preparation of the present invention allows good diffusion of the pesticidal active ingredient, and the desired effect of the pesticide can be obtained.

[0036]

EXAMPLES The present invention will be described in detail below with reference to examples and test examples, but the present invention is not limited to these examples. In addition, in the following Examples, a part represents a weight part.

Preparation Example 1 Powder obtained by adsorbing 1.2 parts of pyriminobac-methyl, 2.1 parts of bensulfuron-methyl, 9 parts of mefenacet and 4 parts of polyoxyethylene arylphenyl ether surfactant on 4 parts of white carbon was used. Prepared. This powder was uniformly mixed with 2.5 parts of acetylene alcohol surfactant adsorbed on 2.5 parts of white carbon, 1 part of polyvinyl alcohol, 10 parts of potassium chloride and 62 parts of anhydrous sodium sulfate, and then subjected to an impact method. Milled by milling.

The obtained powder and one part of the microspheres are uniformly mixed in a high-speed stirrer, an appropriate amount of water is added, and the mixture is kneaded. The mixture is extruded from a plate having a hole of 5 mm and granulated by 10 mm. Cut to length. The obtained granulated material is placed in a horizontal drum, and the granulated material is formed by rolling the granulated material while rotating, and then dried until the water content becomes 0.7 parts. A formulation was obtained.
The particle size distribution of the granular pesticide preparation was such that 85% or more of the particles had an average particle size of 3 mm or more. Further, when 100 particles of the present preparation were put into a container filled with water, all the particles floated.
In addition, the disintegration time of the particles after floating was 10 minutes.

Preparation Example 2 A powder was prepared by adsorbing 1.5 parts of bensulfuron-methyl, 20 parts of mefenacet and 3 parts of a polyoxyethylene arylphenyl ether surfactant on 3 parts of white carbon. This powder, powder obtained by adsorbing 3 parts of polyoxyethylene arylphenyl ether phosphate ester surfactant on 3 parts of white carbon, powder obtained by adsorbing 3 parts of acetylene alcohol surfactant on 3 parts of white carbon, and 2 parts of dextrin And potassium chloride 37.5
Parts were uniformly mixed, and then pulverized by impact pulverization.

The obtained powder and 18 parts of foamed shirasu were uniformly mixed in a high-speed stirrer, and an appropriate amount of water was added.
While extruding and granulating from a plate with a hole of mm, the plate was cut into a length of 10 mm. The obtained granulated material is placed in a horizontal drum, and the granulated material is formed by giving a rolling motion while rotating, and then dried until the water content becomes 3 parts. Obtained. The particle size distribution of this granular pesticide formulation is such that particles having an average particle size of 3 mm or more are 1
00%. Further, when 100 particles of the present preparation were put into a container filled with water, all the particles floated. In addition, the disintegration time of the particles after floating was 7 minutes.

Preparation Example 3 Powder obtained by adsorbing 24 parts of bromobutide, 8 parts of pentoxazone, 8 parts of alkylnaphthalene formalin condensate salt and 3 parts of dialkyl sulfosuccinate on 3 parts of white carbon, and 3 parts of acetylene alcohol surfactant The powder adsorbed on 3 parts of carbon, 2 parts of dextrin and 25 parts of urea were uniformly mixed and then subjected to impact pulverization. The obtained powder and 18 parts of fly ash balloon were uniformly mixed in a high-speed stirrer, kneaded by adding an appropriate amount of water, and then 3 mm
While extruding and granulating from a plate with holes
It was cut to a length of 8 mm.

The obtained granules are placed in a horizontal drum, and the granules are rolled while rotating to form the granules. The drying inlet temperature is set to 65 ° C., and the granules are dried until the water content becomes 3 parts. Thus, a pesticidal granular composition having a water surface floating property was obtained. The particle size distribution of the granular pesticide preparation was such that 85% or more of the particles had an average particle size of 3 mm or more. Further, when 100 particles of the present preparation were put into a container filled with water, only one broken particle settled. In addition, the disintegration time of the particles after floating was 8 minutes.

Preparation Example 4 Powder obtained by adsorbing 48 parts of pyrochilone and 2.5 parts of polyoxyethylene arylphenyl ether on 2.5 parts of white carbon, and adsorbing 2.5 parts of acetylene alcohol on 2.5 parts of white carbon Powder, enzyme-modified dextrin 1.5 parts, potassium chloride 8 parts and anhydrous sodium sulfate 30
The parts were uniformly mixed and then subjected to impact pulverization. The obtained powder,
10 parts (1 part as a component) of water-containing microspheres are uniformly mixed in a high-speed stirrer, and an appropriate amount of water is added and kneaded.
While extruding and granulating from a plate with a hole of mm, the plate was cut into a length of 10 mm.

The obtained granules are placed in a horizontal drum, and the granules are rolled while rotating to form the granules. The drying inlet temperature is 65 ° C. and the water content is 1.5 parts. Drying was performed to obtain a pesticidal granular composition having water surface floating properties. The particle size distribution of this granular pesticide formulation is 3 m average particle size
m or more particles were 95% or more. The present formulation 10
When 0 grains were put into a container filled with water, all grains floated on the water surface. In addition, the disintegration time of the particles after floating was 6 minutes.

Preparation Example 5 Powder obtained by adsorbing 24 parts of mepronil, 8 parts of alkylnaphthalene formalin condensate salt and 3 parts of dialkyl sulfosuccinate on 3 parts of white carbon, and 3 parts of acetylene alcohol surfactant in 3 parts of white carbon The adsorbed powder, 2 parts of dextrin and 31 parts of granular urea were uniformly mixed, and then subjected to impact pulverization. The obtained powder and 20 parts of foamed shirasu were uniformly mixed in a high-speed stirrer, an appropriate amount of water was added, and the mixture was kneaded. The mixture was extruded from a plate having a 3 mm hole, and granulated to a length of 8 mm. Cut.

The obtained granules are placed in a horizontal drum, and the granules are rolled while rotating to form the granules. After that, the drying inlet temperature is set to 65 ° C., and the water content becomes 5.5 parts. Drying was performed to obtain a pesticidal granular composition having water surface floating properties. The particle size distribution of this granular pesticide formulation is 3 m average particle size
m or more particles were 85% or more. The present formulation 10
When 0 tablets were placed in a container filled with water,
Only the grains settled and the other grains floated on the water surface. In addition, the disintegration time of the particles after floating was 27 minutes.

Preparation Example 6 Powder obtained by adsorbing a mixed solution obtained by heating 8 parts of etofenprox and 4 parts of polyoxyethylene arylphenyl ether on 12 parts of white carbon, and 2.5 parts of acetylene alcohol on white carbon Powder adsorbed on 2.5 parts, polyvinyl alcohol 1 part, potassium chloride 1
After uniformly mixing 0 parts and 57 parts of anhydrous sodium sulfate, the mixture was subjected to impact pulverization. Obtained powder and 15 parts of water-containing microspheres
(1.5 parts as ingredients) in a high-speed stirrer,
After adding an appropriate amount of water and kneading, the mixture was cut into a length of 10 mm while being extruded and granulated from a plate having a hole of 5 mm.

The obtained granules are placed in a horizontal drum, and the granules are rolled while rotating to form the granules. The temperature at the dry inlet is 65 ° C., and the water content is 1.5 parts. Drying was performed to obtain a pesticidal granular composition having water surface floating properties. The particle size distribution of this granular pesticide formulation is 3 m average particle size
m or more particles were 95% or more. When 100 particles of this preparation were put into a container filled with water, all the particles floated. The disintegration time of the particles after floating was 12 minutes.

Preparation Example 7 Cartap hydrochloride (24 parts), alkyl naphthalene formalin condensate salt (8 parts) and dialkyl sulfosuccinate 3
Were mixed uniformly with 3 parts of white carbon, 3 parts of acetylene alcohol surfactant adsorbed on 3 parts of white carbon, 2 parts of dextrin and 31 parts of urea, and then subjected to impact pulverization. The obtained powder and 20 parts of foamed shirasu were uniformly mixed in a high-speed stirrer, an appropriate amount of water was added, and the mixture was kneaded. The mixture was extruded from a plate having a 3 mm hole, and granulated to a length of 8 mm. Cut.

The obtained granules are placed in a horizontal drum, and the granules are rolled while rotating to form the granules. The drying inlet temperature is set at 65 ° C., and the granules are dried until the water content becomes 3 parts. Thus, a pesticidal granular composition having a water surface floating property was obtained. The particle size distribution of the granular pesticide preparation was such that 85% or more of the particles had an average particle size of 3 mm or more. When 100 grains of the present preparation were put into a container filled with water, only one cracked grain settled down, and the other grains floated on the water surface. In addition, the disintegration time of the particles after floating was 30 seconds.

Formulation Example 8 24 parts of cartap hydrochloride, 8 parts of alkylnaphthalene formalin condensate salt and dialkyl sulfosuccinate 3
Were mixed uniformly with 3 parts of white carbon, 3 parts of acetylene alcohol surfactant adsorbed on 3 parts of white carbon, 2 parts of dextrin and 31 parts of urea, and then subjected to impact pulverization. The obtained powder and 20 parts of foamed shirasu were uniformly mixed in a high-speed stirrer, kneaded by adding an appropriate amount of water, and then extruded from a plate having a 7 mm hole. Cut.

The obtained granules are placed in a horizontally placed drum, and the granules are rolled while rotating, and molded by applying a rolling motion. The drying inlet temperature is set to 65 ° C., and the drying is performed until the water content becomes 3 parts. Thus, a pesticidal granular composition having a water surface floating property was obtained. The particle size distribution of this granular pesticide formulation was 100% of particles having an average particle size of 3 mm or more. When 100 grains of the present preparation were put into a container filled with water, only one cracked grain settled down, and the other grains floated on the water surface. In addition, the disintegration time of the particles after floating was 15 minutes.

Comparative Formulation Example 1 A granular pesticide formulation was prepared in the same manner as in Formulation Example 1, except that the water was dried until the water content became 0.1 part. When 100 particles of the obtained preparation were put into a container filled with water, about 50 particles settled without floating. The suspended particles did not collapse even after 30 minutes.

Comparative Formulation Example 2 The granulated pesticide composition of Formulation Example 1 was granulated to 1.5 mm.
While extruding and granulating from a plate with holes
It was cut to a length of 4.5 mm. The obtained granulated product is placed in a horizontal drum, and the granulated product is rolled while being rotated and molded, and then dried until the water content becomes 0.8 parts. Example 2 was obtained. In the particle size distribution of this granular pesticide preparation, particles having an average particle size of 3 mm or more were not found. When 100 particles of this preparation were put into a container filled with water, 15 particles settled, and the other particles floated on the water surface. All of the suspended particles also settled within 30 seconds, and collapsed after a while at the bottom.

EXAMPLE 1 One week after transplanting the rice, 250 g of the granular pesticide formulation of Formulation Example 1 was applied to a handful of submerged sewage paddies having an average depth of 5 cm shown in FIG. Divided into 8.3 g and distributed from the ridge. At this time, the shortest distance of the spread of the grains (the shortest distance between the sprayed ridge and the position where the grains fell during spraying; the same applies hereinafter) was 2 to 6 m from the ridge. Immediately after the introduction, several people confirmed the position where the particles fell, set a pole here, measured the distance between the poles, calculated the spray area, and calculated the ratio of the spray area to the total paddy area.
As a result, the spray area ratio was 11.2%.

EXAMPLE 2 One week after transplanting the rice, 250 g of the granular pesticide formulation of Formulation Example 1 was placed in a flooded sewage paddy having an average altitude of 5 cm shown in FIG. Each litter was divided into 10 g portions on a ladle having a length of 40 cm and scattered from the ridge. The shortest distance of the spread of the grains at this time was 3 to 8 m from the ridge. Immediately after the introduction, a pole was set up at the position where the grains fell, the distance between the poles was measured to calculate the spray area, and the ratio of the spray area to the total paddy area was calculated. As a result, the spray area ratio was 15.8%.

EXAMPLE 3 One week after transplanting the rice, 1250 g of the granular pesticide formulation of Formulation Example 1 was injected into a 50-meter submerged paddy field with an average water depth of 4 cm shown in FIG. The preparation was loaded onto the attached power spreader, and the shutter was opened and closed instantaneously. At this time, the shortest distance of the spread of the grains was 10 to 15 m from the ridge, and 1250 g of the preparation was sprayed 42 times. At this time, the pole was set up at the position where the grains spread, the distance between the poles was measured to calculate the spray area, and the ratio of the spray area to the total paddy area was calculated. As a result, the spray area ratio was 29.
4%.

Example 4 One week after transplanting the rice, 1250 g of the granular pesticide formulation of Formulation Example 1 was injected into a 50-meter submerged paddy field with an average depth of 4 cm shown in FIG. It was loaded into the attached power sprayer, and the shutter lever was adjusted to spray continuously while walking on the ridge. At this time, the shortest distance of the spread of the grains was 10 m from the ridge, and the longest flight distance was 20 m.
As a result of calculating the ratio of the spray area to the total paddy area at this time, it was 29.0%.

EXAMPLE 5 One week after transplanting the rice, the algae were circulated around the ridge by a spraying method described in Example 4 in a flooded sewage paddy field of 10a having an average water depth of 5 cm shown in FIG. Granular pesticide formulation 250 of Formulation Example 6
g. At this time, the shortest distance of the spread of the grains is 10 m.
And the longest flight distance was 20 m. As a result of calculating the ratio of the sprayed area to the total paddy area at this time, 47.8 was obtained.
%Met. One week after spraying the granular pesticide formulation, the degree of damage to the rice weevil was observed. As a result, no damage to the rice weevil was observed in this treatment group.
In the adjacent untreated plot, about half of the rice plants were damaged by rice weevil.

Comparative Example 1 One week after transplanting the rice, 250 g of the granular pesticide formulation of Formulation Example 1 was placed in an aluminum bag in a submerged sewage paddy field having an average water depth of 5 cm and 10 a shown in FIG. He walked along the ridge while dropping on the water surface at his feet and sprayed. At this time, the shortest distance of the spread of the grains is 0.5 m from the ridge, and the fall width is 0.3.
m. As a result of calculating the ratio of the spray area to the total paddy area at this time, it was 4.2%.

Comparative Example 2 One week after transplanting the rice, 250 g of the granular pesticide formulation of Formulation Example 1 was placed in a flooded sewage paddy of 10 a with an average depth of 5 cm shown in FIG. And thrown in a cup from the ridge. The shortest distance of the spread of the grains at this time was 2 to 3 m from the ridge. At this time, a pole was set up at the position where the grains spread, the distance between the poles was measured to calculate the spray area, and the ratio of the spray area to the total paddy area was calculated. As a result, the spray area ratio was 3.5%.

Test Example 1 After 24 hours of spraying, water was collected from the points indicated by the alphabets of the paddy fields in FIGS. 1 to 4 and 6 to 7 and analyzed, and theoretically the case where the pesticidal active ingredient was uniformly dispersed in water. Water concentration of 100
%, The standard deviation of the concentration in water at each point was divided by the average value, and the fluctuation rate was calculated. The results are shown in Tables 1, 2 and 3. One month after spraying,
The herbicidal effect on the 1.5-leaf stage Nobie at the point indicated by the alphabet of the paddy fields 6 and 7 during spraying was observed.
(No effect) to 5 (complete death). Table 4 shows the results.

[0063]

[Table 1]

[0064]

[Table 2]

[0065]

[Table 3]

[0066]

[Table 4]

As shown in Tables 1 and 2, in Examples of the present invention, even in a paddy field where algae were generated, the diffusibility of the pesticidal active ingredient was good, and the effect expected for the pesticide active ingredient was exhibited. In Comparative Examples, the diffusibility of the components was poor, and the effect of the pesticidal active component was insufficient particularly at the location of the algae.

[0068]

According to the present invention, even if labor-saving spraying is performed in a paddy field where algae have been generated or in a paddy field where rice plants have grown to some extent, the diffusion of the pesticide active ingredient is good, and The effect can be obtained.

That is, if the preparation of the present invention containing a large amount of particles having a particle size of 3 mm or more is used, the paddy field conditions such as spraying directly from the ridge without entering the paddy field, or spraying by operating a radio-controlled helicopter from the ridge. By selecting a spraying method according to, for example, it is possible to spray pesticides from a small paddy field of 30 are or less to a large paddy field of several hectares,
Extremely labor-saving.

[Brief description of the drawings]

FIG. 1 is a drawing showing a paddy field used in Example 1. In the figure, the dotted line indicates the range where the algae were blown. In addition, the alphabet indicates the sampling point of paddy water and the observation point of expression of the pesticide active ingredient in Test Example 1.

FIG. 2 is a drawing showing a paddy field used in Example 2. In the figure, dotted lines and alphabets have the same meaning as in FIG.

FIG. 3 is a drawing showing a paddy field used in Example 3. In the figure, dotted lines and alphabets have the same meaning as in FIG.

FIG. 4 is a drawing showing a paddy field used in Example 4. In the figure, dotted lines and alphabets have the same meaning as in FIG.

FIG. 5 is a drawing showing a paddy field used in Example 5. In the figure, dotted lines and alphabets have the same meaning as in FIG.

FIG. 6 is a drawing showing a paddy field used in Comparative Example 1. In the figure, dotted lines and alphabets have the same meaning as in FIG.

FIG. 7 is a drawing showing a paddy field used in Comparative Example 2. In the figure, dotted lines and alphabets have the same meaning as in FIG. that's all

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4H011 AA01 AB01 AB02 AC01 BA01 BA06 BB03 BB06 BB09 BB10 BB13 BB14 BC03 BC06 BC07 BC18 BC19 BC20 DA02 DC01 DC05 DC06 DC08 DD02 DH02 DH03 DH10

Claims (4)

[Claims] 1. A pesticidal active ingredient having a particle size of 3 mm or more has a particle size distribution of 80% or more and a property of floating on the water surface, and disintegrates on the water surface within 30 minutes. Uniformly diffusible granular pesticide formulation. 2. The homogeneously diffusible granular pesticide preparation according to claim 1, which contains a surfactant. 3. The homogeneously diffusible granular pesticide preparation according to claim 1, which comprises 0.3 to 6 parts by weight of water per 100 parts by weight of the preparation. 4. A homogeneously diffusible granular pesticide containing an active ingredient of pesticides, having a particle size distribution of 80% or more having a particle size of 3 mm or more and floating on the water surface, and disintegrating on the water surface within 30 minutes. A method for spraying a homogeneously diffusible granular pesticide formulation, wherein the formulation is spread and spread over an area of 5% to 50% of the total paddy field at a distance of 1 m or more from the levee of a flooded paddy field.