JP2002363004A - Sustained-release pesticide granules and their application method - Google Patents

Abstract

(57) Abstract: A sustained-release pesticide granule of the present invention comprises a core substance (A) containing an active ingredient of a pesticide and a coating substance (B) coated thereon. Is a thermoplastic resin (b1) 100
Parts by weight, 1 to 100 parts by weight of iron powder or copper powder (b2). According to the present invention, a sustained-release pesticide granule which suppresses initial dissolution of an active ingredient from a pesticide granule and gradually starts dissolving the active ingredient after a certain period of time, and application using the granule. A method can be provided, whereby even when the crop is applied with the sustained-release pesticide granule according to the present invention in the early stage of growth, the effect of the pesticide active ingredient can be maintained without lowering its original control effect. And can reduce phytotoxicity to crops.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sustained-release pesticide granule and a method for applying the same. More specifically, the present invention relates to a sustained-release pesticide granule in which a nucleus granule containing an agrochemical active ingredient is coated with a coating material composed of a thermoplastic resin and iron powder or copper powder, and a method for applying the same.

[0002]

BACKGROUND OF THE INVENTION Conventionally, in pesticide granules,
The harm to agricultural crops by pesticidal active ingredients has become a problem, and the sustainability of the effects of pesticidal active ingredients has been an issue in terms of labor saving in agricultural work. To solve these points,
Various studies have been made on pesticide granules that can control the amount of the pesticidally active ingredient eluted into water.

For example, granules obtained by coating a core containing a pesticide active ingredient with a thermoplastic resin film (Japanese Patent Publication No. 01-5002), a coating layer is provided on a core containing a pesticide active ingredient, and the active ingredient is gradually released. (Japanese Patent Publication No. 01-4483), a granule provided with a means for preventing film unevenness at the time of conversion, and a granule wherein a nucleus containing an agricultural chemical active ingredient is coated with a water-insoluble oligomer or polymer (Japanese Patent Publication No. 02-57047) ), A granule comprising a mixture of a sulfonylurea herbicidal active ingredient, activated carbon, paraffin wax and a mineral carrier (JP-A-63-35504).
Publication), a soluble alkali component is eluted from granular foam glass to form pinholes, and then the pinholes of the foam glass particles are impregnated with a liquid of perfume, fertilizer, and herbicide. JP-A-63-176337), an agricultural chemical obtained by directly adhering or immobilizing a fine powder of a hydrophobic substance on the surface of solid agricultural chemical active ingredient particles (Japanese Patent Application Laid-Open No. 01-3).
No. 16302).

[0004] Furthermore, a granule obtained by impregnating a hydrophobic oily liquid on the surface of a non-disintegrating pesticide granule in water and coating it with a hydrophobic fine powder (JP-A-02-286602), in a form in which bentonite is agglomerated. On the surface of a non-oil-absorbing particulate carrier, granules comprising bentonite, a pesticidally active ingredient and calcium chloride, which can be disintegrated in a preferable state in water (JP-A-03-106802), and an absorbent fine powder containing an insecticidal active ingredient, etc. Coated granules (Japanese Patent Application Laid-Open No. 03-7202), granules obtained by granulating a powder mixture containing a polyglycerin fatty acid ester and an agrochemically active ingredient, wherein the polyglycerin fatty acid ester Granules provided with a control means for changing HLB (Japanese Patent Laid-Open No. 05-237), absorbent fine powder containing an agrochemical active ingredient, or a non-oil-absorbing particulate carrier containing an agrochemical active ingredient When coating, a granule (JP-A-04-352701) using a mixture of a water-soluble adhesive and a water-insoluble adhesive as an adhesive for coating, and an inert material containing 10% or more of a cellulose powder. Granules obtained by coating a pesticidal active ingredient with a granular carrier (JP-A-05-1
No. 7302), a granule obtained by coating a non-disintegrable particle with a composition containing a pesticidal active ingredient and bentonite as essential components, and also containing a mixture of poval, a vinyl acetate resin emulsion or the like and water as a binder. 05-906
JP-A-6-9303, JP-A-06-9304, and JP-A-06-9304. 06-72805, JP-A-06-80
No. 514).

[0005] However, the pesticide granules according to the prior art described above are not always satisfactory in terms of the production method being complicated, the effect of reducing the pesticidal effect of the pesticide active ingredient on the crops and the effect of controlling the pesticides. When the pesticide granules are applied to the initial crops, there is a problem that phytotoxicity to the crops is strongly exhibited and the control effect is not persistent.

[0006] Therefore, it can be produced by a simple production method, and even when applied to crops in the early growth stage, the phytotoxicity of the pesticidally active ingredient to the crops can be reduced, and the effect can be sustained without lowering the original control effect. There has been a demand for the development of pesticide granules capable of improving the properties.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems associated with the prior art as described above, and when the pesticidal active ingredient is eluted from the pesticide granule, the initial elution is suppressed, and after a certain period of time elapses. It is an object of the present invention to provide a novel pesticide granule that gradually starts dissolving the active ingredient and an application method using the granule.

[0008]

SUMMARY OF THE INVENTION The sustained-release pesticide granule according to the present invention comprises a core material (A) containing an active ingredient of a pesticide coated with a coating substance (B), and the coating substance (B) is (b1). Thermoplastic resin 1
(B2) iron powder or copper powder 1 to 100 parts by weight
It is characterized by consisting of parts by weight.

It is desirable that the thermoplastic resin (b1) is selected from a styrene-acrylate copolymer, an ethylene-vinyl acetate copolymer or a urethane resin. It is also desirable that the pesticidal active ingredient is 3-allyloxy-1,2-benzisothiazole-1,1-dioxide (probenazole). The method for applying the sustained-release pesticide granule according to the present invention comprises the above-mentioned sustained-release pesticide granule in which the pesticidal active ingredient is 3-allyloxy-1,2-benzoisothiazole-1,1-dioxide (probenazole). It is characterized in that it is applied when seeds are sown.

[0010]

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the sustained-release pesticide granules according to the present invention and a method for applying the same will be described in detail. The sustained-release pesticide granule according to the present invention is obtained by coating a core material containing a pesticidally active ingredient with a coating material. First, the nuclear granule will be described.

The weight percentage and weight ratio in the present invention are calculated from the dry weight of the whole composition. Nucleated granule (A) The nucleated granule used in the present invention usually has a production particle size of 0.1.
It is desirably 6 to 2.0 mm, preferably 0.8 to 1.5 mm.

The method for preparing the core granules is not particularly limited, and can be prepared by a conventionally known method. Specifically, it is preferable to prepare by the following steps 1-3. Step 1: The pesticidal active ingredient, amorphous silica, surfactant, binder and carrier and, if desired, other adjuvants are mixed together with a hammer mill to obtain a solid powdery raw material composition.

Step 2: An appropriate amount of water is added to and kneaded with the powdery raw material composition, and the kneaded material is placed in a basket-type extrusion granulator and granulated to obtain a granular composition. Step 3: The granular composition is flow-dried and further sieved to have a target particle size distribution to obtain a core granule. The nuclear granules used in the present invention are composed of an agricultural chemical active ingredient and other additives (surfactant, binder, carrier, other ingredients, etc.).

Hereinafter, the pesticidal active ingredient used in the core granule and other additives will be described. [Agrochemical Active Ingredient] The pesticidal active ingredient contained in the sustained-release pesticide granule according to the present invention includes at least one insecticide active ingredient and / or at least one fungicidal active ingredient, or one herbicidal active ingredient.
Consists of more than species.

The content of the pesticidal active ingredient used in the present invention is not particularly limited, but is generally 0.01 to 90% by weight, preferably 0.1 to 60% by weight of the whole preparation.
% By weight is desirable. Depending on the kind of the pesticidal active ingredient, it may be blended at an appropriate content so that the required application rate per 10 ares is obtained. Such insecticidal, fungicidal and herbicidal active ingredients are not particularly limited, but include the following. In addition, these pesticide active ingredient names are "Agrochemical Handbook 1994 Edition".
(Published by the Japan Plant Protection Association).

As the pesticidal active ingredient used in the present invention, it is preferable to use the following bactericidal active ingredient, probenazole. Insecticidal active ingredient As the insecticidal active ingredient used in the present invention, CYAP,
MPP, MEP, ECP, pirimiphosmethyl, diazinon, quinalphos, isoxathion, viridafenthione, chlorlipyphosmethyl, chlorpyrifos, ESP,
Bamidothion, marathon, PAP, dimethoate, formotion, thiometon, ethyl thiometon, hosalon,
PMP, DMTP, prothiophos, sulprophos, profenophos, pyraclophos, DDVP, monocrotophos, BRP, CVMP, dimethylvinphos, CVP, propaphos, acephate, isofenphos, DEP, E
PN, Ethion, NAC, MTMC, MIPC, BPM
C, PHC, XMC, Ethiophenecarb, Bendiocarb, Pirimicarb, Carbosulfan, Benfuracarb, Mesomyl, Oxamyl, Thiodicarb, Alanicarb, Allesulin, Resmethrin, Tefluthrin, Bifenthrin, Permethrin, Cypermethrin, Cyhalothrin, Cyfluthrin, Fenpromethrin , Cycloprothrin, fenvalerate, flucitrinate, fluvalinate, etofenprox, cartap, thiocyclam, bensultap, diflubenzuron, teflubenzuron, chlorfluazuron, flufenoxuron, tebufenozide, deprofezin, phenoxycarb, benzoepine, imidacloprid, meta Aldehyde, isoprothiolane, DBEDC, pyrethrum, delis, sulfate Chin, machine oil, DCV, BT,
CPCBS, Kelsen, Phenisobromolate, Tetradifone, BPPS, Quinomethionate (quinoxaline), Amitraz, Benzomate, Phenothiocarb,
Hexitiazox, fenbutatin oxide, dienochlor, fenpyroximate, debufenpyrad, fluazinam, pyridaben, clofenthedine, DPC (dinocap), milbemectin, bialaphos, DCIP, methyl isothiocyanate, dazomet, monacrosporium fimatopagum, steinanema capocapoepoe, and steinanema capopaepoe. , Mesulfenphos, phosthiazate, levamisole hydrochloride, carbam, carbam sodium and the like.

The fungicidal active ingredient used in the present invention includes inorganic copper (copper sulfate, quicklime, basic calcium copper sulfate, basic copper sulfate, basic copper chloride, cupric hydroxide, copper ammonium complex salt) ), Organic copper, copper nonylphenol sulfonate, DBE
DC, copper terephthalate, sulfur, zineb, maneb, manzeb, ambam, polycarbamate, organic sulfur nickel salt, propineb, ziram, thiuram, thiadiazine, captan, sulfenic acid, TPN, fusaride, IB
P, EDDP, tolclofosmethyl, pyrazophos, fosetyl, thiophanatemethyl, benomyl, carbendazole, thiabendazole, iprodione, vinclozolin, procymidone, fluoroimide, oxycarboxine, mepronil, flutranil, teclophthalam, pencyclon, metalaxyl, oxadixyl, triazimefon, buternil micron, buternil micron Hexaconazole, propiconazole, diphenoconazole, ipconazole, imibenconazole, triflumizole, prochloraz, pefurazoate, fenarimol, pyrifenox, triforine, organic arsenic (MAF, MAF
A), dithianone, quinoxaline, DPC, dimethylimol, flusulfamide, benzazole, diclomedine, triazine, ferimzone, fluazinam, dietofencarb, probenazole, isoprothiolane,
Tricyclazole, pyroquilon, oxolinic acid, iminoctadine acetate, propamocarb hydrochloride, sodium alginate, blasticidin S, kasugamycin,
Examples include polyoxin, validamycin A, streptomycin, oxytetracycline, mildiomycin, machine oil, carbam, PCNB, hydroxyisoxazole, echromezol, dazomet, chloroneb, metasulfocarb, methyl isothiocyanate, and the like.

Herbicidal active ingredients The herbicidal active ingredients used in the present invention include 2,4P
A, MCP, MCPB, MCPP, Triclovir, Fenothiol, Clomeprop, Naproanilide, Fenoxapropethyl, Fluazifop, Quizalofopethyl, CNP, Clomethoxynil, Bifenox, I
PC, Fenmedifam, MBPMC, Benthiocarb, Orthovencarb, Esprocarb, Molinate,
Dimepiperate, bilibuticarb, DCPA, alachlor, butachlor, pretilachlor, metolachlor, tenylchlor, bromobutide, mefenacet,
Napropamide, difenamide, propizamide, isoxaben, ashram, DCMU, linuron, siduron, daimulon, methyldaimuron, carbbutyrate,
Isouron, thiazafluron, ethidimuron, tebuthiuron, bensulfuron-methyl, pyrazosulfuron-ethyl, fluzasulfuron, thifensulfuron-methyl, imazosulfuron, metsulfuron-methyl, CAT, atrazine, simethrin, amethrin, promethrin, dimethmethrin, cyanazine, hexazinone , Terbasil, bromacil, renacil, PAC, bentazone, dazomet, pyridate, oxadiazon, pyrazolate, pyrazoxifene, benzofenab, paraquat, diquat, trifluralin, bethrosin,
Prodiamine, pendimethalin, MDBA, MDBA
Sodium salt, picloram, imazapyr, imazaquin ammonium salt, dithiopyr, TCTP, DPA, tetrapion, piperophos, amiproposmethyl, butamiphos, SAP, glyphosate, glyphosate ammonium salt, glyphosate trimesium salt, glyphosate sodium salt, bialaphos, glufosinate , Ioxynil, DBN, DCBN, alloxydim, sethoxydim,
ACN, chlorphthalim, cinmethylin, benfresate, carbum, maleic hydrazide, chlorate, cyanate and the like.

[Other additives] Surfactants The surfactants used in the present invention include nonionic surfactants, anionic surfactants, cationic surfactants commonly used in agricultural chemical formulations. An amphoteric surfactant is used and is not particularly limited, but specifically, one or more surfactants selected from the following examples can be used.

The nonionic surfactants used in the present invention include alkyl ethers, polyoxyethylene alkyl aryl ethers, polyoxyethylene styryl phenyl ethers, polyoxyethylene alkyl esters,
Examples thereof include polyoxyethylene sorbitan alkylate, polyoxyethylene phenyl ether polymer, polyoxyethylene alkylene aryl phenyl ester, polyoxyethylene alkylene glycol, and polyoxyethylene polyoxypropylene block polymer.

Examples of the anionic surfactant include lignin sulfonate, alkylaryl sulfonate dialkyl sulfosuccinate, polyoxyethylene alkyl aryl ether sulfate, alkyl naphthalene sulfonate, and polyoxyethylene styryl phenyl ether sulfate. No. Examples of the cationic surfactant and the amphoteric surfactant include an alkylamine salt, a quaternary ammonium salt alkylbetaine, and an amine oxide.

Binders The binders that can be used in the present invention are not particularly limited, but include the following binders, for example, polyvinyl alcohol, starch, dextrin, carboxymethylcellulose, polyvinylvirolidone, sodium alginate, sodium ligninsulfonate, For example, calcium ligninsulfonate can be used.

Carriers Carriers that can be used in the present invention are not particularly limited, but include clay, silica, talc, bentonite, calcium carbonate, pumice, diatomaceous earth, vermiculite, perlite, and crystalline silica. One or more selected from among them can be used.

Other Ingredients Further, examples of the physical property improver usable in the present invention include vegetable oils such as castor oil, sesame oil, sunflower oil, corn oil, cottonseed oil, and soybean oil. In the granules of the present invention, the above pesticidal active ingredient, surfactant, binder,
In addition to carriers, pesticide active ingredient stabilizers, binders, pigments,
Components such as a dye may be blended.

Coating substance (B) The sustained-release pesticide granules according to the present invention are the above-mentioned core granules (A)
Is coated with the above-mentioned coating substance (B). The pesticide granule contains 0.1 to 20 parts by weight, preferably 0.5 to 10 parts by weight of the coating substance (B) based on 100 parts by weight of the core granule (A).
Parts by weight, more preferably 1 to 10 parts by weight. In the present invention, the coating substance refers to a solid substance.

With the above numerical range, it is possible to obtain a sustained-release pesticide granule in which the initial elution of the pesticidal active ingredient from the pesticide granule is suppressed and the active ingredient is gradually eluted after a certain period of time. In the present invention, the initial dissolution refers to the dissolution of the pesticide active ingredient in water up to 5 days after the pesticide granule is put into water, and the “certain period” after the elapse of a certain period, similarly refers to the pesticide granule. It indicates the period from the time of being put into water until the lapse of 5 days.

The coating substance (B) used in the present invention contains a thermoplastic resin (b1), iron powder or copper powder (b2) and other components. The coating substance (B) is used in an amount of 1 to 100 parts by weight, preferably 20 to 100 parts by weight, more preferably 30 to 100 parts by weight, based on 100 parts by weight of the thermoplastic resin (b1). Desirably.

When the thermoplastic resin (b1), the iron powder or the copper powder (b2) is in the above range, the initial elution of the pesticide active ingredient from the pesticide granule is suppressed, and after a certain period of time, the active ingredient is gradually removed. A sustained-release pesticide granule that starts dissolution can be obtained. Hereinafter, the thermoplastic resin, metal powder, and other components that are the composition of the coating substance used in the present invention will be described.

[Thermoplastic resin (b1)] The thermoplastic resin (b1) used in the present invention comprises 4 parts of the entire coating substance (B).
5-99.5% by weight. Such a thermoplastic resin (b1) is not particularly limited, but may be an acrylic resin, a vinyl chloride resin, a urethane resin, a styrene-acryl copolymer resin, a styrene-acrylate copolymer resin, acetic acid, or the like. Vinyl copolymer resin, vinyl acetate-ethylene copolymer resin, vinyl acetate-acryl copolymer resin, vinyl acetate-ethylene-acryl copolymer resin, vinyl acetate-ethylene-vinyl chloride copolymer resin, and the like. It is preferable to use a styrene-acrylate copolymer resin, a vinyl acetate copolymer resin, a vinyl acetate-ethylene copolymer resin, and more preferably a vinyl acetate copolymer resin. The thermoplastic resin (b1) used in the present invention is selected from the above resins.

The thermoplastic resin (b1) used in the present invention
Consists of one or more selected from the above resins. [Iron powder or copper powder (b2)] The metal powder such as iron powder or copper powder (b2) used in the present invention is oxidized due to the presence of water molecules, the volume increases, and the film-forming substance is destroyed. It is preferable because it has characteristics. In particular, it is desirable to use iron powder having a remarkable volume expansion. Metal powders such as nickel, chromium, aluminum, and the like, in which rust hardly spreads over the entire metal and has small volume expansion, are not preferred for the purpose of the present invention.

The iron powder or copper powder (b) used in the present invention
The addition amount of 2) is determined from the above-mentioned weight ratio in the coating substance and the addition amount of the thermoplastic resin. Such iron powder or copper powder is appropriately selected and used depending on the type and amount of the pesticidal active ingredient to be used and the type and amount of the thermoplastic resin used. The iron powder or copper powder has a particle size of 10 to 1000 μm, preferably 10 to 1000 μm.
00 μm.

[Other Components] In addition, in the coating substance used in the present invention, in addition to the thermoplastic resin (b1) and the iron powder or the copper powder (b2), a solid organic acid which promotes oxidation of the added metal powder. Etc. can also be added. Examples of the solid organic acid include succinic acid, DL-malic acid, tartaric acid, citric acid, and the like.

The sustained-release pesticide granule according to the present invention suppresses initial dissolution when the pesticidal active ingredient elutes from the granule into water.
The elution of the active ingredient is gradually started after a certain period of time. In the present invention, the "initial dissolution" refers to the dissolution of the pesticide active ingredient in water up to 5 days after the pesticide granule has been put into water, and the "certain period" after a certain period has elapsed.
Similarly, it refers to the period from when the pesticide granule is put into water until 5 days have passed.

The pesticide granules containing the metal powder according to the present invention have a dissolution rate of the pesticide active ingredient in water of 15% or less, preferably 10% or less, from the time of introduction into water to the fifth day (initial dissolution). And after 15 to 77 days, preferably 1
It is desirably 100% after 5 to 63 days. In the present invention, the term "sustained-release pesticide granules" refers to pesticide granules having the above-mentioned dissolution pattern.

When the dissolution rate of the pesticidal active ingredient in water is within the above range, even if the sustained-release pesticide granules according to the present invention are applied in the early stage of growing a crop, the original control effect of the pesticidal active ingredient can be maintained. The effect can be maintained without lowering, and the phytotoxicity of the agricultural chemical active ingredient to the crop can be reduced. If the rate of dissolution of the pesticidal active ingredient in water is greater than 15% from day 5 in the water (initial dissolution), phytotoxicity occurs in the early stage of growth of the crop, and the initial dissolution is within the above range. Even if the dissolution rate in water reaches 100% by the 14th day, the effect of the pesticidal active ingredient cannot be maintained, and even if the initial dissolution is within the above range, the dissolution in water is not sufficient. If the rate becomes 100% after the 77th day, the original control effect of the pesticidal active ingredient is reduced, which is not preferable.

The method of measuring the dissolution rate of the pesticidal active ingredient in water was carried out as follows. In a beaker having a volume of 1000 ml, 500 ml of 3rd hard water is placed (water depth: 6 cm), and the sustained-release pesticide granules of the present invention are uniformly dispersed in water. The beaker was left in a dark room at 20 ° C., and water was sampled at regular intervals from three places (5 cm deep), and the concentration of probenazole contained in the sampled water was measured by liquid chromatography. The elution amount of the pesticidal active ingredient eluted in the third hard water was calculated.

The dissolution rate when the pesticide active ingredient contained in the test granule is completely eluted in 500 ml of water in a beaker is defined as 100, and the dissolution rate of the pesticide active ingredient is determined from the dissolution amount measured at regular intervals. Calculated. The method for preparing the sustained-release pesticide granules according to the present invention is not particularly limited, but the surface of the core granules obtained by the above method is sprayed with a mixture of a thermoplastic resin emulsion and metal powder, and dried and sieved. Can be manufactured.

The above-mentioned sustained-release pesticide granules are produced by spraying a mixture of a thermoplastic resin emulsion and metal powder on the surface of the core granules, and a part of the mixture (aqueous solution) is impregnated inside the core granules. Therefore, after drying, the coating material is not completely separated from the core granules, and a part of the coating material is formed inside the core granules. The thickness of the coating material coated on the core granule is not particularly limited, and the kind of the thermoplastic resin to be used, the usage scene of the sustained-release pesticide granule, the production conditions of the sustained-release pesticide granule and the core particle It changes depending on the composition of the agent and the like.

Method for Applying Sustained-Release Pesticide Granules The method for applying the sustained-release pesticide granules according to the present invention is not particularly limited, and may be used in a method in which ordinary pesticide granules are applied. it can. Examples of such methods include a method of applying rice at the time of sowing, a method of applying pesticide granules to the water surface simultaneously with rice planting in paddy field application, and a method of applying the pesticide granules to the water surface after rice planting in paddy field application.

The sustained-release pesticide granules of the present invention preferably use probenazole as an active ingredient of pesticides, and such sustained-release pesticide granules can be used by the above-mentioned application method, particularly when sowing rice. It is useful to use this method. Here, when sowing rice, specifically, when the coated pesticide granules are applied simultaneously with the seeds in the application of rice seedlings in a nursery box or paddy field, or beforehand mixed with a sustained-release pesticide granule in the seedling cultivation soil It refers to the case of doing.

[0041]

According to the present invention, there is provided a sustained-release pesticide granule which suppresses the initial dissolution of the pesticidal active ingredient from the pesticide granule and gradually starts dissolving the active ingredient after a certain period of time. Can be provided.

[0042]

EXAMPLES Hereinafter, the present invention will be described more specifically based on examples, but the present invention is not limited to these examples. In the following Examples and Comparative Examples, “parts” all means parts by weight.

[0043]

Example 1 24.0 parts of probenazole as a pesticide active ingredient (bactericide), 5.0 parts of white carbon as amorphous silica, 0.2 parts of sodium lauryl sulfate as surfactant, polyvinyl alcohol as binder 2.0
Parts and 67.5 parts of clay as a carrier were mixed and pulverized by a hammer mill to obtain 98.7 parts of a uniform powder mixture.

To this, an appropriate amount of water was added and kneaded well. The obtained kneaded material is granulated with a basket-type extrusion granulator,
After fluidized drying, the granules were sized by sieving to obtain core granules serving as the core of the sustained release pesticide granules of the present invention. On the surface of the obtained core granules, 1.0 part of a styrene-acrylate copolymer (solid content of Polysol AP-4710 (trade name of Showa Polymer Co., Ltd.)) and 1.0 part of iron powder (reagent) were added. The mixed liquid of 3 parts was spray-coated and dried and sieved again to obtain a sustained-release pesticide granule of the present invention.

The content (% by weight) of each component in the pesticide granules is summarized in Table 1 below.

[0046]

Example 2 The amount of clay contained in the powder mixture prepared in Example 1 was reduced to 65.5 parts,
6.7 parts were obtained. The obtained powder mixture was granulated, dried and sized in the same manner as in Example 1 to obtain a core granule serving as a core of the sustained-release pesticide granule of the present invention.

The styrene-acrylic acid ester copolymer described in Example 1 was used in an amount of 3.0 parts, and the core granules were spray-coated in the same manner as in Example 1 and again dried and sieved to obtain the product of the present invention. Sustained-release pesticide granules were prepared. The content (% by weight) of each component of the sustained-release pesticide granule is summarized in Table 1 below.

[0048]

Example 3 The amount of clay contained in the powder mixture prepared in Example 1 was reduced to 63.5 parts,
4.7 parts were obtained. The obtained powder mixture was granulated, dried and sized in the same manner as in Example 1 to obtain a core granule serving as a core of the sustained-release pesticide granule of the present invention.

The styrene-acrylic ester copolymer described in Example 1 was used in an amount of 5.0 parts, and the core granules were spray-coated in the same manner as in Example 1 and dried and sieved again to obtain the present invention. Of sustained-release pesticide granules were prepared. The content (% by weight) of each component of the sustained-release pesticide granule is summarized in Table 1 below.

[0050]

Example 4 The content of clay contained in the powder mixture prepared in Example 1 was 67.79 parts, and
99 parts were obtained. The obtained powder mixture was granulated, dried and sized in the same manner as in Example 1 to obtain a core granule serving as a core of the sustained-release pesticide granule of the present invention.

The content of the iron powder described in Example 1 was adjusted to 0.01 part, and the core granules were spray-coated in the same manner as in Example 1 and dried and sieved again to obtain the sustained-release property of the present invention. Pesticide granules were prepared. The content (% by weight) of each component of the sustained-release pesticide granule is summarized in Table 1 below.

[0052]

Example 5 The powder mixture prepared in Example 1 contained 67.7 parts of clay, and the powder mixture was 98.9 parts.
Got a part. The obtained powder mixture was granulated, dried and sized in the same manner as in Example 1 to obtain a core granule serving as a core of the sustained-release pesticide granule of the present invention.

The content of the iron powder described in Example 1 was set to 0.1 part, and the core granules were spray-coated in the same manner as in Example 1 and dried and sieved again to obtain the sustained-release property of the present invention. Pesticide granules were prepared. The content (% by weight) of each component of the sustained-release pesticide granule is summarized in Table 1 below.

[0054]

Example 6 The amount of clay contained in the powder mixture prepared in Example 1 was reduced to 67.3 parts, and the powder mixture 9
8.5 parts were obtained. The obtained powder mixture was granulated, dried and sized in the same manner as in Example 1 to obtain a core granule serving as a core of the sustained-release pesticide granule of the present invention.

The content of the iron powder described in Example 1 was set to 0.5 part, and the core granules were spray-coated in the same manner as in Example 1 and dried and sieved again to obtain the sustained-release property of the present invention. Pesticide granules were prepared. The content (% by weight) of each component of the sustained-release pesticide granule is summarized in Table 1 below.

[0056]

Example 7 The content of clay contained in the powder mixture prepared in Example 1 was reduced to 66.8 parts,
8.0 parts were obtained. The obtained powder mixture was granulated, dried and sized in the same manner as in Example 1 to obtain a core granule serving as a core of the sustained-release pesticide granule of the present invention.

The content of the iron powder described in Example 1 was set to 1.0 part, and the core granules were spray-coated in the same manner as in Example 1 and dried and sieved again to obtain the sustained-release property of the present invention. Pesticide granules were prepared. The content (% by weight) of each component of the sustained-release pesticide granule is summarized in Table 1 below.

[0058]

EXAMPLE 8 The content of clay contained in the powder mixture prepared in Example 1 was reduced to 66.8 parts,
8.0 parts were obtained. The obtained powder mixture was granulated, dried and sized in the same manner as in Example 1 to obtain a core granule serving as a core of the sustained-release pesticide granule of the present invention.

The iron powder described in Example 1 was replaced with copper powder (reagent).
In the same manner as in Example 1, the above granules were spray-coated and dried and sieved again to prepare the sustained-release pesticide granules of the present invention. The content (% by weight) of each component of the sustained-release pesticide granule is summarized in Table 1 below.

[0060]

Example 9 The content of clay contained in the powder mixture prepared in Example 1 was reduced to 67.4 parts,
8.6 parts were obtained. The obtained powder mixture was granulated, dried and sized in the same manner as in Example 1 to obtain a core granule serving as a core of the sustained-release pesticide granule of the present invention.

A styrene-acrylate copolymer (Polysol AP-4710) was coated on the surface of the obtained core granule.
(Solid content of Showa Kogaku Co., Ltd.) 1.0 part, 0.3 parts of iron powder (reagent), and 0.1 part of citric acid were further spray-coated with a liquid, and dried again with a sieve. Separation gave a sustained release pesticide granule of the present invention. The content (% by weight) of each component in the sustained release pesticide granule is summarized in Table 1 below.

[0062]

Example 10 The content of clay contained in the powder mixture prepared in Example 1 was reduced to 66.7 parts, and the content of the powder mixture 9 was reduced.
7.9 parts were obtained. The obtained powder mixture was granulated, dried and sized in the same manner as in Example 1 to obtain a core granule serving as a core of the sustained-release pesticide granule of the present invention.

A styrene-acrylate copolymer (Polysol AP-4710) was coated on the surface of the obtained core granule.
(Solid content of Showa Polymer Co., Ltd.) 1.0 part, iron powder (reagent) 1.0 part, and a liquid mixed with 0.1 part of citric acid were spray-coated, and the dried sieve was applied again. Separation gave a sustained release pesticide granule of the present invention. The content (% by weight) of each component in the sustained release pesticide granule is summarized in Table 1 below.

[0064]

EXAMPLE 11 The content of clay contained in the powder mixture prepared in Example 1 was reduced to 65.5 parts,
6.7 parts were obtained. The obtained powder mixture was granulated, dried and sized in the same manner as in Example 1 to obtain a core granule serving as a core of the sustained-release pesticide granule of the present invention.

On the surface of the obtained core granules, 3.0 parts of a vinyl acetate copolymer (solid content of Polysol SH-502 (trade name of Showa Polymer Co., Ltd.)) and 0.1 part of iron powder (reagent) were added. The liquid in which 3 parts were mixed was spray-coated and dried and sieved again to obtain a sustained-release pesticide granule of the present invention. The content (% by weight) of each component in the sustained release pesticide granule is summarized in Table 1 below.

[0066]

Example 12 The content of clay contained in the powder mixture prepared in Example 1 was reduced to 64.8 parts, and the content of the powder mixture 9 was reduced.
6.0 parts were obtained. The obtained powder mixture was granulated, dried and sized in the same manner as in Example 1 to obtain a core granule serving as a core of the sustained-release pesticide granule of the present invention.

On the surface of the obtained core granule, 3.0 parts of a urethane resin (solid content of Superflex 126 (trade name of Daiichi Kogyo Seiyaku Co., Ltd.)) and 1.0 part of iron powder (reagent) were added. The mixed liquid was spray-coated and dried and sieved again to obtain a sustained-release pesticide granule of the present invention. The content (% by weight) of each component in the sustained release pesticide granule is summarized in Table 1 below.

[0068]

Comparative Example 1 Probenazole drug substance 24.0 as fungicide
Parts, 5.0 parts of white carbon as amorphous silica, 0.2 parts of sodium lauryl sulfate as a surfactant, 2.0 parts of polyvinyl alcohol as a binder, and 68.8 parts of clay as a carrier were mixed and ground together with a hammer mill. This gave 100.0 parts of a uniform powder mixture. An appropriate amount of water was added thereto and kneaded well. The obtained kneaded product was granulated by a basket-type extrusion granulator, and was fluid-dried, and then sieved to obtain a pesticide granule.

The content (% by weight) of each component in the pesticide granules is summarized in Table 1 below.

[0070]

Comparative Example 2 The content of the clay contained in the powder mixture prepared in Comparative Example 1 was reduced to 67.8 parts, and powder mixture 9
9.0 parts were obtained. The obtained powder mixture was granulated, dried and sized in the same manner as in Comparative Example 1 to obtain a core granule serving as a core of the coated pesticide granule.

A styrene-acrylate copolymer (Polysol AP-4710) was coated on the surface of the obtained core granule.
(Solid content of Showa Polymer Co., Ltd.) 1.0 part of the liquid was spray-coated and dried and sieved again to obtain a coated pesticide granule. The content (% by weight) of each component in the coated pesticide granules is summarized in Table 1 below.

[0072]

Comparative Example 3 The content of clay contained in the powder mixture prepared in Comparative Example 1 was reduced to 66.3 parts, and powder mixture 9
7.5 parts were obtained. The obtained powder mixture was granulated, dried and sized in the same manner as in Comparative Example 1 to obtain a core granule serving as a core of the coated pesticide granule.

A styrene-acrylate copolymer (Polysol AP-4710) was coated on the surface of the obtained core granule.
(Solid content of Showa Kogaku Co., Ltd.) Spray coated with a mixture of 1.0 part of iron powder (reagent) and 1.5 parts of iron powder (reagent), and dried and sieved again to obtain coated pesticide granules I got The content (% by weight) of each component in the pesticide granules is summarized in Table 1 below.

[0074]

Comparative Example 4 The content of clay contained in the powder mixture prepared in Comparative Example 1 was reduced to 66.8 parts, and powder mixture 9
8.0 parts were obtained. The obtained powder mixture was granulated, dried and sized in the same manner as in Comparative Example 1 to obtain a core granule serving as a core of the coated pesticide granule.

A styrene-acrylate copolymer (Polysol AP-4710) was coated on the surface of the obtained core granule.
(Solid content of Showa Polymer Co., Ltd.) 1.0 part of nickel powder (reagent) was mixed with 1.0 part of a liquid, spray-coated, and dried and sieved again to obtain a coated pesticide granule. I got The content (% by weight) of each component in the pesticide granules is summarized in Table 1 below.

Next, according to Test Examples 1 to 3, the sustained-release pesticide granules of the present invention show a sustained-release property of the pesticidal active ingredient, and show a phytotoxicity-reducing action without reducing the control effect of the active ingredient. Illustrate. Test Example 1 ( Aqueous dissolution test of pesticide active ingredient) 500 ml of 3rd hard water in a beaker of 1000 ml in size
(Water depth 6 cm), Examples 1 to 12 and Comparative Example 1
42 mg of sustained-release pesticide granules prepared according to 4 are uniformly dispersed in water. The beaker was left in a dark room at 20 ° C., and water was sampled from three places at a depth of 5 cm at regular intervals. The concentration of probenazole in the water sample was measured by liquid chromatography, and the whole eluted in the water in the beaker. The elution amount of probenazole was calculated.

When the total amount of probenazole in the test granules eluted completely into 500 ml of water in the beaker, the concentration of propenazole was 20 ppm, and the elution rate was calculated from the elution amount measured at regular intervals. The test results obtained are shown in Table 1 below.

[0078]

[Table 1]

As is clear from the results in Table 1, Example 1
The sustained-release pesticide granules of the present invention obtained in Nos. 1 to 12 are characterized in that the pesticide active ingredient propenazole starts to elute in water 2 to 7 days after being put into water, and the active ingredient is eluted. Was confirmed, the pesticidal active ingredient was completely eluted in water after 15 days to 77 days. In other words, it is confirmed that the sustained-release pesticide granules of the present invention obtained in Examples 1 to 12 receive the suppression of dissolution of the pesticide active ingredient, particularly the suppression of initial dissolution, and show a quadratic curve dissolution pattern. Was.

On the other hand, the granules of Comparative Example 1 started dissolving the active ingredient immediately after being put into water, and showed a dissolution rate of 52% of the pesticide active ingredient 5 days after being put into water, No initial elution suppression was observed. In the granules of Comparative Example 2 and Comparative Example 4 in which iron powder was not mixed, the pesticide active ingredient started dissolving slowly, and in Comparative Example 2, the dissolution of the pesticide active ingredient in water was observed until 5 days after being put into water. No (0
%) And Comparative Example 4 showed 1% elution of the component in water 5 days after being charged in water, and the elution inhibition was confirmed. However, since the dissolution of the pesticide active ingredient is strongly suppressed,
Even after 77 days in water, the active ingredient is completely (100
%) Did not elute.

The granules of Comparative Example 3 in which iron powder was added in an unnecessarily large amount were granules containing a required amount of iron powder (Example)
In comparison with that, no inhibition of the dissolution was observed in the initial stage, and the dissolution rate was 100% after 14 days from the introduction into water, and the dissolution of the component was not persistent. According to the following Test Examples 2 and 3, when the sustained-release pesticide granule of the present invention containing probenazole as an active ingredient was mixed with a seedling cultivation medium used for raising rice seedlings, the effect of reducing or preventing the damage to paddy rice caused by probenazole was demonstrated. Prove that you have. Moreover, it proves that it has an effect of controlling rice blast for a long period of time.

Test Example 2 (Influence on the Growth of Rice Seedlings) 100 g and 50 g of the sustained-release pesticide granules of the present invention were added to 4 liters of conventionally used culture medium for raising seedlings and mixed well. A seedling cultivation soil mixed with the sustained-release pesticide granules of Examples 1 to 3 was placed in a standard seedling raising box (width 30 cm × length 60 cm × height 3).
cm) 1 box is filled with an equivalent amount of 3 liters as floor soil, and rice seeds (variety: Nipponbare) which have been subjected to normal seed disinfection and preliminary treatment are sown on the floor soil, and the agrochemical granules are further added. The mixed culture was covered in an amount equivalent to 1 liter per standard seedling.

The above seedling raising box was allowed to stand in a germination chamber at 32 ° C. for 2 days to promote germination of the seeded rice seeds. The seedling raising box after the budding treatment was moved into a glass greenhouse to perform seedling management. The germination rate of the rice seeds was calculated by sowing 400 seeds per seedling box using a seedling box having a 1/10 area of the standard seedling box, and confirming the number of germination 2 days and 7 days after sowing. The budding was performed according to the above conditions.

In this test, one 1/10 seedling raising box was used per test plot, and the test was repeated 5 times, and the average value was calculated. The results are shown in Table 2. For seedling growth in the seedling raising box after sowing, 180 g was seeded per box using a standard seedling raising box. The budding was performed according to the above conditions. The seedling raising box after the budding treatment was greened in an artificial weather chamber in which 50% of natural light at 20 ° C. was shielded from light for one day, and then moved to a transparent acrylic resin greenhouse. Seedling management was carried out for 21 days after sowing, and plant height, leaf age and rooting degree were examined. This test was repeated three times with one standard seedling raising box per test plot.

The plant height was measured for a total of 100 samples, with one sample from each test plot as one individual, and the average value of three repetitions was calculated.
showed that. Leaf age was measured for a total of 100 samples as one sample per sample from each test section, and the average value of three repetitions was calculated. Further, the degree of rooting was objectively investigated 21 days after sowing in comparison with the untreated section. The results are shown in Table
It is shown in FIG.

For comparison, a granule containing probenazole but having no initial dissolution control (Comparative Example 1) was treated in the same manner as described above to give a comparative group, and a test was conducted in which the granule containing probenazole was not treated at all. The ward was treated as an untreated ward.

[0087]

[Table 2]

As can be seen from the results in Table 2 above, in the seedling raising boxes treated with the sustained-release pesticide granules of Examples 1 to 3 in which the initial elution was suppressed (invention section), The germination rate was 90% or more, and there was no great difference in the germination rate from the untreated section. In addition, the seedling growth after sowing did not differ from the untreated plot, and a healthy seedling that could be transplanted to Honda was obtained 21 days after sowing.

On the other hand, in the comparative plot to which probenazole granules (Comparative Example 1) which had not been subjected to the initial elution suppression treatment were applied, the rice growth was inferior and the seedling growth was lower than in the inventive plot and the non-treated plot. It was clear that it was bad and caused phytotoxicity. Test Example 3 (Rice blast control effect) 50 g of the sustained-release pesticide granule of the present invention was added to 4 liters of a conventionally used culture medium for raising seedlings and mixed well. The seedling cultivation soil mixed with the pesticide granules is placed in a standard seedling raising box (width 30 cm × length 6).
0 cm × 3 cm height) A box is filled with an equivalent amount of 3 liters as floor soil, and rice seeds (variety: Koshihikari) which have been subjected to normal seed disinfection and preliminary treatment are sown on the floor soil. The soil mixed with the pesticide granule was covered with an equivalent amount of 1 liter per standard seedling.

The seedling raising box was allowed to stand for 2 days in a germination chamber at 32 ° C. to promote germination. The seedling raising box after the budding treatment was moved into a vinyl greenhouse, and the seedling raising was managed for 21 days after sowing. In a paddy field where blast disease occurs naturally every year, a test plot having an area of 60 m ² (3 m × 20 m) was made in one plot, and the seedlings raised by the above method were transplanted with a rice transplanter.

In the investigation of the occurrence of rice blast, 50 days and 60 days after transplantation, the number of lesions in the top three leaves of each strain was examined for 150 strains in each test plot. For comparison, the seedlings treated with the probenazole granules prepared by the method of Comparative Example 1 and not subjected to the initial dissolution suppression treatment and the probenazole granules prepared without the metal powder by the method of Comparative Example 2 were used. The seedlings treated with the agent were similarly transplanted (comparative plot). The effect of each treatment group was calculated from the control value (%) based on the comparison with the number of lesions in a seedling transplantation group without treatment with probenazole granules (untreated group). The results are shown in Table-3.

[0092]

[Table 3]

As can be seen from the results in Table 3, in the inventive plots using the sustained-release pesticide granules of the present invention (Examples 1 to 3), rice blast caused by natural infection was observed for a long time after transplantation in paddy fields. It was shown that the onset was almost completely or substantially controlled. On the other hand, in the control plots (Comparative Examples 1 and 2), the control effect against blast was insufficient.

Continued on the front page (72) Inventor Yoshiaki Tamura 5-30-27 Tai, Tamano-shi, Okayama Prefecture (72) Motohiro Hiramatsu 5-20-3 Asahicho, Atsugi-shi, Kanagawa Prefecture (72) Inventor Yonemura Shinji 2-8-11-205 F-term (reference) 1-8-11-OKADA, Atsugi-shi, Kanagawa 4H011 AA01 AB01 AC01 AC04 BB10 BC18 BC19 DA04 DC10 DD01 DF01 DF02 DH02 DH05 DH19 DH27

Claims (4)

[Claims] 1. A coating material (B) is coated on a nuclear granule (A) containing an agrochemical active ingredient, wherein the coating material (B) is (b).
1) A sustained-release pesticide granule comprising (b2) 1 to 100 parts by weight of iron powder or copper powder with respect to 100 parts by weight of a thermoplastic resin. 2. The sustained-release pesticide granule according to claim 1, wherein the thermoplastic resin (b1) is selected from a styrene-acrylate copolymer, a vinyl acetate copolymer and a urethane resin. . 3. The method according to claim 1, wherein the active ingredient of the pesticide is 3-allyloxy-1,2.
The sustained-release pesticide granule according to claim 1 or 2, which is -benzoisothiazole-1,1-dioxide (probenazole). 4. A method for applying a sustained-release pesticide granule, which comprises applying the sustained-release pesticide granule according to claim 3 at the time of sowing rice seeds.