JP2019019062A - Agrochemical composition with controlled elution of agrochemical active ingredients - Google Patents

Abstract

In a phenoxasulfone-containing agricultural chemical preparation, the elution of phenoxasulfone in water at the time of application is controlled to prevent the occurrence of phytotoxicity due to local concentration increase.
An agrochemical composition containing phenoxasulfone and polyvinylpyrrolidone.
[Selection figure] None

Description

  The present invention relates to an agrochemical composition in which the elution of an agrochemical active ingredient is controlled, and more specifically, the elution of an agrochemical active ingredient can be controlled without requiring a complicated process, and the local concentration of the agrochemical active ingredient at the time of application The present invention relates to an agrochemical composition capable of preventing the occurrence of phytotoxicity associated with an increase.

  Phenoxasulfone exhibits a high herbicidal effect against many annual paddy rice weeds such as Nobies, Kogi, and Azenas, and is used as a herbicide for paddy rice (see Patent Document 1). The phenoxasulfone applied to paddy fields is localized and highly concentrated at the treatment point, increasing the risk of chemical damage. Patent Documents 2 and 3 disclose that root suppression phytotoxicity may occur in rice at the early growth stage. Patent Documents 2 and 3 disclose phenoxasulfone safeners, but technical means such as elution control of phenoxasulfone are necessary to fundamentally remove the risk of occurrence of phytotoxicity.

  As a means for controlling the dissolution of an agrochemical active ingredient, for example, a means for processing an agrochemical active ingredient itself, such as microencapsulation described in Patent Document 4 and sustained release bulk powder described in Patent Document 5, Means for structurally providing elution control performance are known, such as a hydrophobic substance-coated granule described in Patent Document 6 and the like, and a hydrophobic substance-containing granule described in Patent Document 7 and the like. However, since the former two involve special processing steps, the cost is inevitable, and the latter two are premised on the formation of a coating structure or a matrix structure with a hydrophobic substance. Limited to granular pesticides that do not disintegrate in water.

  On the other hand, polyvinylpyrrolidone is a widely known polymer compound, and is mainly used as a physical adjustment aid such as a binder and a disintegrant in the agricultural chemical field. In addition, Patent Document 8 discloses decomposition of a specific agricultural chemical active ingredient. It is described that there is an action to prevent. Patent Document 9 also discloses that there is an action of reducing phytotoxicity to useful plants derived from alkylbenzenesulfonic acid which is a surfactant contained in an aqueous preparation. However, it has not been known so far that polyvinylpyrrolidone can control the dissolution of agrochemical active ingredients in water.

International Publication No. 2001/12613 International Publication No. 2011/145318 International Publication No. 2011/145329 JP 2004-103481 A JP-A-8-92497 Japanese Patent Laid-Open No. 10-25202 JP 2000-26206 A JP-A-5-320010 JP 2014-196253 A

  An object of the present invention is to control the dissolution of phenoxasulfone in water at the time of application in a pesticidal composition containing phenoxasulfone as an agrochemical active ingredient, and prevent the occurrence of phytotoxicity due to local concentration increase.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that in pesticidal compositions containing phenoxasulfone as an pesticidal active ingredient, phenoxasulfone in water can be obtained by blending polyvinylpyrrolidone in the composition. As a result, it was found that the elution of sucrose can be made gentle, and the present invention has been completed.

That is, the present invention has the following contents.
(1) An agrochemical composition containing phenoxasulfone and polyvinylpyrrolidone.

  (2) The agricultural chemical composition as described in (1) above, containing 0.05-2 parts by mass of polyvinylpyrrolidone with respect to 1 part by mass of phenoxasulfone in the agricultural chemical composition.

（ここで、ｃは溶液１００ｍＬ中のポリビニルピロリドンのグラム数を示し、η_ｒｅｌは水に対する溶液の相対粘度を示す。）
で定義されるＫ値が１０−１１０である、前記（１）または（２）に記載の農薬組成物。 (3) When the viscosity of a 1% by weight aqueous solution of polyvinylpyrrolidone was measured by a capillary viscometer at 25 ° C., the following formula (I):

(Where c is the number of grams of polyvinylpyrrolidone in 100 mL of the solution, and η _rel is the relative viscosity of the solution with respect to water.)
The agrochemical composition according to the above (1) or (2), wherein the K value defined by is 10-110.

  (4) The agricultural chemical composition according to any one of (1) to (3), which is a granular material.

  (5) Furthermore, it contains a surfactant, a hollow body and a solid carrier, and is molded by an extrusion granulation method, and has a short diameter of 3-8 mm, an aspect ratio of 1-3, a substantially cylindrical shape whose entire surface is a curved surface, or It has a substantially spherical shape appearance, a specific gravity of 0.3-1 and a property of collapsing on the water surface within 30 minutes after being dropped on the water surface. object.

  (6) The agricultural chemical composition according to (5), wherein the polyvinyl pyrrolidone defined by the formula (I) has a K value of 10-50.

  (7) An elution-suppressing agricultural chemical composition containing phenoxasulfone and polyvinylpyrrolidone.

  (8) A phenoxasulfone elution control agent containing polyvinylpyrrolidone as an active ingredient.

  (9) A method for controlling the dissolution of phenoxasulfone, comprising adding polyvinylpyrrolidone to a pesticidal composition containing phenoxasulfone as an pesticidal active ingredient.

  According to the present invention, since the dissolution of phenoxasulfone in water can be controlled, the amount of elution is suppressed so that the concentration at the initial application does not exceed the maximum allowable concentration, thereby reducing the risk of occurrence of phytotoxicity. It is possible to stably maintain a concentration equal to or higher than the effective concentration and enhance the residual effect.

  The agrochemical composition of the present invention contains phenoxasulfone as an agrochemical active ingredient. Fenoxasulfone (3-[(2,5-dichloro-4-ethoxybenzyl) sulfonyl] -4,5-dihydro-5,5-dimethyl-1,2-oxazole) is superior to nobies etc. It is a herbicidal active ingredient showing a herbicidal effect. The content of phenoxasulfone in the agrochemical composition is appropriately set according to the dosage form, but in the case of solid preparations such as granules, granular wettable powders, powders, wettable powders, 0.1- 80% by mass (hereinafter simply referred to as “%”) is preferable, 0.5 to 75% is more preferable, and 1 to 20% is particularly preferable. On the other hand, in the case of liquid preparations such as aqueous suspensions and oil suspensions, 0.1 to 60% is preferable, and 3 to 50% is more preferable.

（ここで、ｃは溶液１００ｍＬ中のポリビニルピロリドンのグラム数を示し、η_ｒｅｌは水に対する溶液の相対粘度を示す。）
本発明に使用されるポリビニルピロリドンのＫ値は特に限定されないが、通常１０−１１０、好ましくは２０−１００である。 Moreover, the agrochemical composition of the present invention contains polyvinylpyrrolidone. Polyvinyl pyrrolidone is known to exhibit different viscosities in aqueous solutions depending on the degree of polymerization of the vinyl pyrrolidone monomer constituting the polyvinyl pyrrolidone, and examples of the index include a K value represented by the following formula (I).

(Where c is the number of grams of polyvinylpyrrolidone in 100 mL of the solution, and η _rel is the relative viscosity of the solution with respect to water.)
The K value of polyvinylpyrrolidone used in the present invention is not particularly limited, but is usually 10-110, preferably 20-100.

  The content of polyvinylpyrrolidone in the agrochemical composition of the present invention is appropriately set according to the dosage form and the like, but in the case of solid preparations such as powders, granules, wettable powders, and wettable powders, 0.01 -10% is preferable, and 1-8% is more preferable. On the other hand, in the case of liquid preparations such as emulsions, aqueous suspensions and oil suspensions, 0.01 to 10% is preferable, and 1 to 5% is more preferable.

  The blending ratio of phenoxasulfone and polyvinylpyrrolidone in the agrochemical composition of the present invention is not particularly limited, but from the viewpoint of controlling the dissolution of phenoxasulfone in water, it is usually 1 part by mass of phenoxasulfone (hereinafter simply referred to as “part”). ) Polyvinylpyrrolidone is 0.05-1 part, preferably 0.1-0.7 part, more preferably 0.125-0.625 part, particularly preferably 0.2-0.4. .

  If desired, the agrochemical composition of the present invention may be supplemented with auxiliary components such as surfactants, binders, disintegrants, and the like, carriers such as solid carriers and liquid carriers, hollow bodies, etc. It can be contained as an agent.

  The surfactant is not particularly limited. For example, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, sucrose fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene resin acid ester, polyoxyethylene fatty acid diester, polyoxyethylene alkyl ether , Polyoxyethylene alkyl phenyl ether, polyoxyethylene dialkyl phenyl ether, polyoxyethylene alkyl phenyl ether formalin condensate, polyoxyethylene polyoxypropylene block polymer, alkyl polyoxyethylene polypropylene block polymer ether, polyoxyethylene fatty acid amide, poly Oxyethylene fatty acid bisphenyl ether, polyalkylene benzyl phenyl ether, polio Nonionic surface activity such as silalkylene styryl phenyl ether, acetylene diol, polyoxyalkylene-added acetylene diol, polyoxyethylene ether type silicone, ester type silicone, fluorosurfactant, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil Agents; alkyl sulfates, polyoxyethylene alkyl ether sulfates, polyoxyethylene alkyl phenyl ether sulfates, polyoxyethylene styryl phenyl ether sulfates, lignin sulfonates, alkyl sulfosuccinates, naphthalene sulfonates, alkyl naphthalene sulfones Acid salt, salt of formalin condensate of naphthalenesulfonic acid, salt of formalin condensate of alkylnaphthalenesulfonic acid, fatty acid salt, polycarboxylate, N-methyl Anionic surfactants such as fatty acid sarcosinate, resinate, polyoxyethylene alkyl ether phosphate, polyoxyethylene alkylphenyl ether phosphate; laurylamine hydrochloride, stearylamine hydrochloride, oleylamine hydrochloride, stearylamineacetic acid Cationic surfactants such as alkylamine salts such as salts, stearylaminopropylamine acetate, polyoxyethylene alkylamine, alkyltrimethylammonium chloride, alkyldimethylbenzalkonium chloride; amphoteric surfactants such as amino acid type or betaine type Is mentioned.

  The binder is not particularly limited. For example, dextrin, water-soluble starch, xanthan gum, guar gum, sucrose, gum arabic, polyvinyl alcohol, polyvinyl acetate, polyethylene glycol having an average molecular weight of 6000-20000, polyethylene oxide having an average molecular weight of 100,000-5 million , Phospholipids (eg, cephalin, lecithin, etc.). Of these, dextrin, water-soluble starch, and the like are preferable from the viewpoint of elution control of phenoxasulfone.

  The disintegrant is not particularly limited. For example, sodium tripolyphosphate, sodium hexametaphosphate, metal stearate, cellulose powder, dextrin, methacrylic ester copolymer, polyaminocarboxylic acid chelate compound, sulfonated styrene / isobutylene / anhydrous Examples thereof include maleic acid copolymers and starch / polyacrylonitrile graft copolymers. Of these, sodium tripolyphosphate, dextrin, and the like are preferable from the viewpoint of elution control of phenoxasulfone.

  The solid support is not particularly limited, but natural minerals such as quartz, clay, kaolinite, pyrophyllite, sericite, talc, bentonite, acid clay, attapulgite, zeolite, diatomaceous earth, etc .; calcium carbonate, ammonium sulfate, sodium sulfate, chloride Inorganic salts such as potassium; organic solid carriers such as synthetic silicic acid, synthetic silicate, starch, cellulose and plant powder; plastic carriers such as polyethylene, polypropylene and polyvinylidene chloride.

  The liquid carrier is not particularly limited. For example, monohydric alcohols such as methanol, ethanol, propanol, isopropanol, and butanol, and polyvalent alcohols such as ethylene glycol, diethylene glycol, propylene glycol, hexylene glycol, polyethylene glycol, polypropylene glycol, and glycerin. Alcohols such as alcohols; polyhydric alcohol compounds such as propylene glycol ether; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, cyclohexanone; ethyl ether, dioxane, ethylene glycol monoethyl ether, di Ethers such as propyl ether and tetrahydrofuran; fats such as normal paraffin, naphthene, isoparaffin, kerosene and mineral oil Aromatic hydrocarbons such as benzene, toluene, xylene, solvent naphtha and alkylnaphthalene; halogenated hydrocarbons such as dichloroethane, chloroform and carbon tetrachloride; ethyl acetate, diisopropyl phthalate, dibutyl phthalate and dioctyl phthalate , Esters such as dimethyl adipate, lactones such as γ-butyrolactone; amides such as dimethylformamide, diethylformamide, dimethylacetamide, N-alkylpyrrolidinone; nitriles such as acetonitrile; sulfur compounds such as dimethyl sulfoxide; Examples include vegetable oils such as bean oil, rapeseed oil, cottonseed oil and castor oil; water and the like.

  As the hollow body, for example, perlite made of pearlite or obsidian, foamed shirasu made of shirasu, phyllite fired by aluminosilicate system, microballoon made of foamed sodium silicate or borax, pumice, granular diatomaceous earth, granular activated carbon, Wood powder, cork powder, kenaf pieces, phenol microballoon made of phenol resin, ecosphere made of epoxy resin, polyurethane foam made of polyurethane resin, microballoon made of polyacrylonitrile resin, fly produced as ash during thermal power generation Examples thereof include a hollow body having one or more independent air chambers such as ash.

If desired, the agrochemical composition of the present invention may contain an agrochemical active ingredient such as a herbicidal active ingredient other than phenoxasulfone, an insecticidal active ingredient, a bactericidal active ingredient, and a plant growth regulating active ingredient at the same time.
The elution control effect of polyvinylpyrrolidone in the present invention is selective to phenoxasulfone. For agrochemical compositions containing a plurality of agrochemical active ingredients, the conventional elution control technology means incorporated in the agrochemical composition for the purpose of controlling the elution of a certain agrochemical active ingredient has improved the elution of other agrochemical active ingredients. Also interfered with and sometimes resulted in undesired and often undesirable results. However, since polyvinylpyrrolidone acts selectively on phenoxasulfone, there is little possibility of affecting the dissolution properties of other agrochemical active ingredients as described above.

Examples of herbicidal active ingredients include ioxynil, aclonifen, acrolein, azafenidin, acifluorfen (including salts with sodium, etc.), azisulfuron, azimsulfur, Ashram, acetochlor, atrazine, anilofos, amicarbazone, amidosulfuron, amitrole, aminocyclopyrochlor, aminocyclopyrochlor ), Ami Lopros-methyl, amethrin, alachlor, alloxydim, isouron, isoxachlortole, isoxaflutole, isoxaflutole, isoxaflutole, isoxaflutole , Isoproturon, ipfencarbazone, imazaquin, imazapic (including salts with amines, etc.), imazapyr (including methyl salts, such as methylazaben) (Imazamethabenz-methyl), imazamox (i azamox, imazethapyr, imazosulfuron, indaziflam, indanofan, indanofan, egridinine ethyl (eglinazine) Phosphorus (ethalfluralin), ethidimuron, ethoxysulfuron, ethoxyphen-ethyl, etofumesate, etobenzanide (sodium salt) endothal-disodium), oxadiazon, oxadiargyl, oxadiclomephone, oxyfluorfen, oryzalin, orthosulfamlone, orthosulfamuron Fentrazone-ethyl, carbbutilate, carbetamide, quizalofop-ethyl, quizalofop-P-ethylropyloxy Quizalofop-P-tefuryl, quinoclamine, quinclorac, quinmerac, cumyluron, clacyfos, sodium phlyosate, sodium glyphosate, glyphosate , Amine, propylamine, isopropylamine, dimethylamine, or a salt such as trimesium), glufosinate (including a salt such as amine or sodium), glufosinate P-sodium, cletodim (Clethodim), clodinahop-prargil (clodinafop-pr) pargyl, clopyralid, clomazone, clomethoxyphen, clomeprop, chloramben, chloridam, chloridam, chloridam, chloridam, chloridam. ethyl), chlorsulfuron, chlorthal-dimethyl, chlorthiamid, chlorphthalim, chlorflurenol-methyl, chlorprofenol. Chlorpropham, Chlorbromuron, Chloroxuron, Chlorotururon, Saflufenacil, Cyanazine, Atyl, e, Diethyl , Dicamba (including salts such as amine, diethylamine, isopropylamine, diglycolamine, sodium or lithium), cycloate, cycloxydim, diclosulam, cyclosulfamuron, Shi Cyclopyrimorate, diclobenil, diclohop-P-methyl, diclohop-methyl, dichlorprop, dichlorprop-P, dichlorprop-P Diquat, dithiopyr, siduron, dinitramine, cinidon-ethyl, cynosulfuron, dinoterb, cyhalohop dibutyl diphenamid), diphen Difenzoquat, diflufenican, diflufenzopyr, simazine, dimetachlor, dimetametrin, dimethamemid ), Dimethylpiperate, dimethylfuron, cinmethylylin, swep, sulcotrione, sulfentrazone, cetoxydimer, tertoxydimter cis), daimuron, dalapon, thiazopyr, thiafenacil, thiencarbazone (sodium salt, methyl ester, etc.), thiocarbadithine, thiocarbazin, thiocarbadithi thidiazimin), thifensulfuron-methyl, desmedifam, desmetrine, tenylchlor, tebutamur, tebutiurox ), Tefriltrione, tembotrione, terbutyrazine, terbutryurine, terbumethyl, turbutomyl, topramzone, tramcodi, Triafamon, tri-allate, trietazine, triclopyr, triclopyr-butotyl, trifluzium oxazine, trifludimox Sulfuron, triflusulfuron-methyl, trifluralin, trifloxysulfuron-sodium, tribenuron-methyl, tribenthrum naptalam (including salts with sodium, etc.), naproanilide, napropamide, napropamide-M, neburon, norflurazon, nolflurazon, vernarate aquat, haloxifen-methyl, haloxyhop, haloxyhop-P, haloxyhop-etoyl, halosulfuron-methyl, halosulfuron-methyl Picolinafen, bicyclopyrone, bispyribac-sodium, pinoxaden, bifenox, piperophor, pyloclon , Pyrazoxyfen, pyrazosulfuron-ethyl, pyrazolynate, bilanafos, pyraflufen-ethyl, thiopyridolyl (Pyridate), pyriftalid, pyributicarb, pyribenzoxim, pyrimisulfan, pyriminobac-methyyl, sulfoxyl pylomibac-methyl fone), piroxslam, phenisopham, fenuron, fenoxaprop-P-ethyl, fenquinotrione, fenthiaprop-thyl , Fentrazamide, fenmedifam, foramsulfuron, butachlor, butafenacil, butamifos, butiraline, butirarate, butiraline alin), butroxydim, flazasulfuron, flampprop (including methyl, ethyl, isopropyl ester), flamprop-M (including methyl, ethyl, isopropyl ester) , Fluazifop-butyl, fluazifop-P-butyl, fluazolate, fluometuron, fluoroglycofenfium salt, fluorglycofenzium salt -Sodium), fluchloralin Flucetosulfuron, flupirsulfuron-methyl-sodium, flufenacet, flufenpyr-ethyl, flupropoxam, flupropoxam , Flumioxazin, flumicrolac-pentyl, flumetsulam, fluridone, flurtamone, fluoxypyr, fluroxypyr Pretilachlor, procarbazone-sodium, prodiamine, prosulfocarb, propaquafolp, propaginro, propaginro, propaginp ), Propyzamide, propisochlor, propyrisulfuron, propham, profluazole, propoxycarbazone sodium salt (propoxycarboxime, propoxycarbazom) oxydim), bromacil, brompyrazon, promethrin, promethon, broxynil (including esters such as butyric acid, octanoic acid or heptanoic acid), bromophenoxime (broxoxime) Bromobutide, floraslam, petoxamide, benazolin, penoxsulam, heptamaloxiblucan, heptamaloxiglucan, heptamaloxiglucan azone), pendimethalin, benzfendizone, benzulide, benzsulfuron-methyl, benzobicyclon, benzofenap (on), benzophenap (on) Pentanochlor, pentoxazone, benfluralin, benfuresate, fosamine, fomesafene, mecoprop, sodium, ethanol, isopropyl , Including salts such as dimethylamine), mecoprop-P-potassium, mesosulfuron-methyl, mesotrione, metazachlor, metazosulfuron, metazosulfuron Benzthiazrone, methamitron, metamihop, methizoline, methyldymron, metoxuron, metoxuron, metoxuron, metoxuron enzuron, metolachlor, metribuzin, mefenacet, monolinuron, molinate, iodosulfuron, iodosulfuron methylsulfurium salt Iofensulfuron, iofensulfuron-sodium, lactofen, linuron, lenacil, 2,3,6-trichlorobenzoic acid (2,3,6- TBA), 2,4,5-trichlorophenoxyacetic acid (2 4,5-T), 2,4-dichlorophenoxyacetic acid (2,4-D) (including salts such as amine, diethylamine, triethanolamine, isopropylamine, sodium or lithium), 4- (2,4- Dichlorophenoxy) butyric acid (2,4-DB), AE-F-150944 (code number), 4,6-dinitro-O-cresol (DNOC) (including salts such as amine or sodium), S-ethyldipropyl Thiocarbamate (EPTC), 2-methyl-4-chlorophenoxyacetic acid (MCPA), MCPA-thioethyl (MCPA-thioethyl), 2-methyl-4-chlorophenoxybutyric acid (MCPB) (including sodium salt, ethyl ester, etc.) , SYP-298 (code number), SYP-300 (code number), S-metorachrome Le (S-metolachlor), 2,2,2 trichloroacetic acid (TCA) (sodium, salts such as calcium or ammonia), and the like.

Examples of insecticidal active ingredients include acrinathrin, azadirachtin, azamethiphos, azinphos-ethyl, azinophos-methyl, acequinacetyl , Acetoprole, acephate, azocyclotin, abamectin, afidopyropen, amidoflumet, amitralb, amitralb, amitraz dicarb, aldoxycarb, allethrin [including d-cis-trans-form, d-trans-form], isazophos, isamifofos, isocarboxion, ), Isofenphos-methyl, isoprocarb, ivermectin, imicyafos, imidacloprid, imiproline (es), imiprothrin Thiophenecarb (ethiofencarb), ethion (ethion), ethiprole (ethofemprote) benzoate, endosulfan, empentrin, oxamyl, oxydimethon-methyl, oxydeprofos, omethoate, adsacus os), kappa-tefluthrin, kappa-bifenthrin, caranjin, cartap (including hydrochloride, etc.), carbaryl, carbosulfan, carbosulfan, (Carbofuran), gamma-BHC (gamma-BHC), xylylcarb, quinalphos, quinoprene, quinomethionate, coumaphos, cliothine, cliothine Phenthezine , Chromafenozide, chlorantaniprole, chlorethoxyphos, chlordane, chloropyrin, chloropyrifos, chloropyrifos , Chlorfenvinphos, chlorfluazuron, chlormephos, cyanophos, diafenthiuron, diamidaphos fos), cyantraniliprole, dienochlor, dienopyrafen, dioxabenfofos, diphenolan, cyclodidichlor, ), Cycloprothrin, dichlorovos, dichloromezothiaz, 1,3-dichloropropene, dicofol, dicyclanil, dicyclanil, Disulfoton, dinotefuran, dinobuton, cyhalothrin [including gamma-form, lambda-form], cyphenothrin [(1R) -trans-citruthrin-trans-form cyfluthrin (including beta-forms), diflubenzuron, cyflumethofen, diflovidazin, cyhexatin, cypermethrin-alpha-beta-beta-etametrin-alpha Body], dimethylvinphos Dimefluthrin, dimethoate, silafluofen, cyromazine, spinetoram, spinosad, spirodiclofen, spirodiclofen, spirodiclofen, spirodiclofen, spirodiclofen. , Sulcofuron-sodium, sulfluramide, suloxafluor, sulfotep, diazinon, thiacloprid, thiamethoxam (thiamethoxam) thoxam, thioxazafen, thiodicarb, thiocyclam, thiosultap, thiozazine, thiotetrax, thiotetone, thiometon tetradifon, tetraniliprole, tetramethylfluthrin, tetramethrin, tebupirimfos, tebufenozide, tebufenozide tebufenozide ad), tefluthrin, teflubenzuron, demeton-S-methyl, temefos, deltamethrin, terbufos, tralothrin (in) transfluthrin, triazamate, triazophos, trichlorfon, triflumuron, triflumezopyrim, trimetrapyr naled, nitenpyram, novaluron, noviflumuron, verticillium lecanii, hydroprene, pasturia penis trans spore (m) parathion, parathion-methyl, halfenprox, halofenozide, bioallethrin, bioarrestrin S-cyclopentenyl, S-cyclopentenyl, S-cyclopentenyl Bioresmethrin, bistrifluron, hydramethylnon, hyphenmethyl, bifenazate, bifenthrin, bifenthrin, piflumine, piflumide. Pyrafluprole, pyridafenthion, pyridaben, pyridalyl, pyrifluquinazone, pyriprole, pyriprole, pyriprole Xipifene, pirimicarb, pyrimithrobin, pyrimiphos-methyl, pirethrinfine, pyrethrinfine ), Fenamiphos, fenitrothion, phenoxycarb, phenothiocarb, phenothrin [including (1R) -trans-form], phenocarb fen fention, phentoate, fenvalerate, fenpyroximate, fenbutatin oxide, fenpropatin, fluorde, sulfoside, fluorde Carboxime (butoxycarboxim), butoxycarboxim, buprofezin, furathiocarb, praletrin, flucripyrimur, flucrypyrimur Including sulfone, fluoacetate, sodium fluoracetate, flucycloxuron, flucytrinate, flusulfamide, fluvalinate (tulfurone) ), Flupyrazofos, flufiprole, flufenerim, flufenoxystrobin, flufenoxuron, fluhexafon fone ubendiamide), flumethrin (flumethrin), professional bird Fen-butoxide (protrifenbute), prothiofos (prothiofos), flonicamid (flonicamid), propaphos (propaphos),
Propargite, profenofos, brofuranilide, profluthrin, propethamfos, propoxur, hexabromoproflux, propofol (Hexaflumuron), Pecilomyces tenuipes, Pecilomyces fumosoroseus, heptafluthrin, heptenophos (heptenophos) ), Permethrin, benclothiaz, bensultap, benzoximate, bendiocarb, benfurcarb, bera, bersia tenaer ), Beauberia bronniati, phoxim, phosalone, phosthiazate, phostietan, phosphamidon, phosphamidon Cutin complex (formacinate), formatenate (formate), malate (malathion), milbemectin (milbemectin), mecarbam (mecarbenfos) (mesulfenfos (mesulfenfos), methomone) ), Metham, methiocarb, methidathion, methyl isothiocyanate, methyl bromide, methoxychlor, methoxyphenodi. (Methoxyphenoxide), methotrin, methotflurin, methoprene, metorcarb, mevinphos, mecrofluthrin, meperfluthrin, meperfluthrin, meperfluthrin, meperfluthrin. Momfluorothrin, Little A-, Little A-B, aluminum phosphide, zinc phosphide, hydrogen phosphine , Lufenuron, rescalure, resmethrin, repimectin, rotenone, fenbutatin oxide (colicide), lime nitrogen (calcium cylenide) 11-tetradecenyl acetate, (Z) -11-hexadecenal, (Z) -11-hexadecenyl acetate, (Z) -9,12-tetradecadienyl acetate, (Z) -9-tetradecen-1-ol (Z, E) -9,11-tetradecadienyl acetate, (Z, E) -9,12-tetradecadienyl acetate, Bacillus popilie (Bacil) us popilliae), Bacillus subtilis (Bacillus subtillis), Bacillus sphaericus (Bacillus sphaericus), Bacillus thuringiensis, subsp. aizawai (Bacillus thuringiensis subsp. Aizawai), Bacillus thuringiensis subsp. Islaelensis, Bacillus thuringiensis subsp. thuringiensis subsp. Tenebrionis), Bt protein (Cry1Ab, Cry1Ac, Cry1Fa, Cry2Ab, mCry3A, Cry3Ab, Cry3Bb, Cry34 / 35Ab1), CL9001-DC (methyl ether) -IP (methyl ether) -IP-methyl-1 1,1,1-G Chloro-2,2-bis (4-chlorophenyl) ethane (DDT), dimethyl-2,2,2-trichloro-1-hydroxyethylphosphonate (DEP), 4,6-dinitro-o-cresol (DNOC), O , O-diethyl-O- [4- (dimethylsulfamoyl) phenyl] -phosphorothionate (DSP), ethyl-p-nitrophenylthionobenzenephosphonate (EPN), nuclear polyhedrosis virus embedded body, NA-85 (code number), NA-89 (code number), NC-515 (code number), RU15525 (code number), ZDI-2501 (code number), XMC, Z-13-icosene-10-one, ZXI8901 (code number), ME5382 etc. can be mentioned.

Examples of bactericidal active ingredients include azaconazole, acibenzolar-S-methyl, azoxystrobin, anilazine, amisulbrom, amethocrom (Aldimorph), isotianil, isopyrazam, isofetamid, isoprothiolane, ipconazole, iprobene, iprobion, iprobion, iprobion. , Imazalil, iminoctadin-tribesate, iminotazine-triacetate, imibenconazole, edifeneconetole Ethimol, ethoxyquin, etridiazole, enestroburin, enoxastrobin, epoxiconazole, organic oil ), Oxadixyl, oxazinylazole, oxathiapiproline, oxycarboxin, oxyquinoline copper, oxytetracycline, oxytetracycline Acid salt (oxpoconazole-fumarate), oxolinic acid (copper dioctanoate), octilinone, olfurase, oryastrobin, olphenylphenol, o-phenyl ugamycin, captaphor, carpropamid, carbendazim, carboxin, carbonone, quinoxythane, quinomethione (quinometane) , Quintozene, guazatine, cufraneb, cuboxystrobin, cresoxime-methyl, clozilacone, chlorizolate (Chlorothalonil), chloroneb (chloroneb), cyazofamid (diazophencarb), diclofenid (diclofenid) ), Diniconazole, diniconazole-M, dineb, dinocap, dipymethitrone, diphenylamine, diphenoconazole (difeneconazole) noconazole), cyflufenamid (cyflufenamid), diflumetorim (diflumetorim), cyproconazole (cyproconazole), cyprodinil (cyprodinil), simeconazole (simeconazole), Jimechirimoru (dimethirimol), dimethyl disulfide (dimethyl disulfide), dimethomorph (Dimethomorph), cymoxanil (Cymoxanil ), Dimoxystrobin, ziram, silthiofam, streptomycin, spiroxamine, sedaxane, zoxa Zoxamide, dazomet, thiadinil, thiabendazole, thiuram, thiophanate, thiophanate-methyl, tefluzamide, ifluzamide (Tecloftalam), tetraconazole, debacarb, tebuconazole, tebufloquin, terbinafine, dodine, odemol triadimol, triadimethon, triazoxide, trichlamide, triclopyrcarb, tricyclone, triticonazole, triticonazole, triticonazole, triticonazole. Roxystrobin, triforine, tolylfluanid, tolclofos-methyl, tornifanide, tolprocarb (narprocarb) abam, natamycin, naphthifine, nitrapyrin, nitrotal-isopropyl, nuarimol, copper nonylphenol, copper nonyl bil sulph. ) (Strain: QST 713), validamycin, varifenate, picarbutrazox, bixafen, picoxystrobin, bittertanol, bitterol Binapacryl, biphenyl, piperalin, hymezazole, pyroxystrobin, pyracrostrobin, pyrazifluzo, pyrazifluzo, pyrazifluzo ), Pyriophenone, pyrisoxazole, pyrifenox, pyributicalcarb, pyribencarb, pyrimethanil (pyrimethanil) n), vinclozolin, ferbam, famoxadone, phenazine oxide, fenamidone, phenaminemol, fenamismolin, fenamismolin. ), Fenpiclonil, fenpyrazamine, fenbuconazole, fenfuram, fenpropidin, fenpropimorphen, fenhexoprimide examid, folpet, phthalide, bupirimate, fuberidazole, blasticidin-S, furamethpyr, furraxyl, furaxyl acid), fluazinam, fluoxastrobin, fluopicolide, fluopyram, fluorimide, fluxapiloxol fluquinadol, fluxapiroxonol fluquinadol Furconazole, fluconazole-cis, fludioxonil, flusilazole, flusulfamide, flutianol, flutolanol, flutolanol (Fluoxyxystrobin), flumetober, fluromorph, proquinazid, prochloraz, procymidone, prothiothiocob, prothiocarb conazole, bronopol, propamocarb-hydrochloride, propiconazole, propineb, zole, hexaben, probenazole, probenazole, probenazole, probenazole, probenazole. benalaxyl), benalaxyl-M, benodanyl, benomyl, pefurazoate, penconazole, benzocyclone influx. , Benthiazole, benthiavaliclb-isopropyl, penthiopyrad, penflufen, boscalid, polysium, alsoxyl. , Polycarbamate, Bordeaux mixture, mancozeb, mandipropamide, mandestrobin, maneb, microbutanyl, microbutanyl neral oils), mildiomycin (mildiomycin), methasulfocarb (methasulfocarb), metam (metam), metalaxyl (metalaxyl), metalaxyl · M (metalaxyl-M
), Methylam, metconazole, metminostrobin, metraphenone, mepanapirim, min, mepyldinocap, meptylinocap, mepyldinopap ), Phosphorous acid and salts, basic copper chloride, silver, cuprous oxide, copper hydride, potassium hydrogen carbonate (Potassium bicarbonate), sodium bicarbonate Sodium bisulfate, sulfur, oxyquinoline sulfate, copper sulfate, (3,4-dichloroisothiazol-5-yl) methyl 4- (tert-butyl) benzoate (Chemical name, CAS registry number: 1231214-23-5), 3-((3,4-dichloroisothiazol-5-yl) methoxy) benzo [d] isothiazole-1,1-dioxide (Chemical name, CAS Registration number: 957144-77-3), BAF-045 (code number), BAG-010 (code number), dodecylbenzenesulfonic acid bisethylenediamine copper complex [II] (DBEDC), MIF-1002 (code number), acetic acid Triphenyltin (TP TA), triphenyltin chloride (TPTC), triphenyltin hydroxide (TPTH), non-pathogenic Ervinia carotobora and the like.

  Examples of plant growth regulating active ingredients include 1-methylcyclopropene, 1-naphthylacetamide, 2,6-diisopropylnaphthalene, 4-chlorophenoxyacetic acid. (4-CPA), benzylaminopurine, ancymidol, aviglycine, carbonone, chlormequat, cloprop, cloxyphonoxy, cloxiphonac Nack potassium salt (cloxyphonac-potassium), cyclanili (Cyclanilide), cytokinins, daminozide, dikeglac, dimethipine, etephon, etocholone, eluchole, elucholate Primridol, forchlorfenuron, gibberellins, inabenfide, indole acetic acid, indole butyric acid Maleic hydrazide, mefluidide, mepiquat chloride, n-decyl alcohol, paclobutrazol, p-hexadione ex c c , Prohydrojasmon, sintofen, thidiazuron, triacontanol, trinexapac-ethyl, uniconazole-P, uniconazole-P 4-oxo- 4- (2-Phenylethyl) aminobutyric acid (chemical name, CAS registration number: 1083-55-2), calcium peroxide and the like can be mentioned.

  The agrochemical composition of the present invention may contain a known safener, if desired. Examples of safeners include furilazole, dichlormid, benoxacor, alidochlor, isoxadifen-ethyl, fenchlorimide, proclulimide ), Iomethrinyl, oxabetrinil, fluxofenim, flurazole, 1,8-naphthalic anhydride (1,8-naphthalic anhydride), cloquintoclone, , Gietre Preparative (dietholate), fenchlorazole (fenchlorazole), isoxadifen (isoxadifen), mefenpyr (mefenpyr), naphthalate Rick polyanhydride (naphthalic anhydride) and the like.

  The dosage form of the composition of the present invention is not particularly limited. For example, it is applied to liquid preparations such as emulsions, aqueous suspensions and oily suspensions, and solid preparations such as powders, granules, wettable powders and granular wettable powders. it can. Among them, a granule that can be safely sprayed without fear of drift to workers and is widely used as a herbicide dosage form is preferable. In recent years, as a new type of granule, it contains an agrochemical active ingredient, a surfactant, a hollow body and a solid carrier, and is molded by an extrusion granulation method, with a short diameter of 3-8 mm, an aspect ratio of 1-3, It has a substantially cylindrical or spherical shape appearance whose entire surface is a curved surface, a specific gravity of 0.3-1 and a property of collapsing on the water surface within 30 minutes after being dropped on the water surface. Granules suitable for water surface application (hereinafter sometimes referred to as “water-floating granules”) are becoming widespread (see Japanese Patent Application Laid-Open No. 2002-179507, etc.). The agrochemical composition is particularly preferably applied to such water-floating granules. Since this water-floating granule has the property of floating, disintegrating, and diffusing, generally, the elution of the agrochemical active ingredient tends to increase, but in the present invention, while maintaining the properties such as the floating property, It can be surprising that the dissolution of phenoxasulfone in water can be suppressed.

  In the case of a water-floating granule, the content of the surfactant in the agricultural chemical composition is usually 0.1-20%, preferably 2-15%, hollow from the viewpoint of floatability, disintegration, and diffusibility. The content of the body is usually 0.1-40%, preferably 1-30%, and the content of the solid carrier is usually 0.1-80%, preferably 1-65%. In addition, the K value of polyvinylpyrrolidone is preferably 100 or less, more preferably 10-50, from the viewpoint of maintaining both the properties inherent to water-floating granules such as buoyancy and disintegration and controlling the dissolution of phenoxasulfone in water. 20-40 are particularly preferred.

  In the production of the agrochemical composition of the present invention, phenoxasulfone and polyvinylpyrrolidone do not require special measures and may be mixed according to a conventional method. At that time, only two components of phenoxasulfone and polyvinylpyrrolidone may be mixed, or may be mixed with other optional components. For example, in the case of a solid preparation such as a normal powder or granule, only two components of phenoxasulfone and polyvinylpyrrolidone are separately pulverized and mixed with other components to control elution of phenoxasulfone in water. This is preferable.

  The manufacturing method of the agrochemical composition of this invention is not specifically limited, It can carry out in accordance with a conventional method. In one embodiment of the production method when the agrochemical composition is a granule or a granular wettable powder, phenoxasulfone, polyvinylpyrrolidone, and other additives as required are mixed, and a predetermined amount of water is added and kneaded. The mixture is extruded from the pores of the screen with an extrusion granulator, and the resulting granulated product is dried, and pulverized and sieved to an appropriate size as necessary to obtain granules and granular wettable powder. . In the case of the above water surface-floating granules, the minor axis is usually 3-8 mm, preferably 3-5 mm, and the aspect ratio (the minor axis and the major axis of the major axis is granulated using a 3-8 mm screen and cut. The ratio is usually in the range of 1-5, preferably 1-3. In addition, the granulated product is put in a horizontally placed drum, and the drum is rotated to give a rolling motion to the granulated product, so that the entire surface has a curved shape such as a substantially cylindrical shape or a substantially spherical shape. Thus, it is possible to prevent generation of fine powder due to wear or collision between water surface floating granules during transportation or spraying using a power spreader or the like. The specific gravity after drying is usually 0.3-1, preferably 0.3-0.5 from the standpoint of floatability, etc., and collapses on the water surface within 30 minutes, preferably within 20 minutes after being dropped on the water surface. It has the property to do.

  One embodiment of the manufacturing method when the agrochemical composition is a powder or wettable powder is a method of preparing by dry pulverization such as a jet mill by mixing phenoxasulfone, polyvinylpyrrolidone, and other additives as required. Illustrated.

  One embodiment of the production method when the agrochemical composition is an aqueous suspension is obtained by mixing phenoxasulfone, polyvinylpyrrolidone, and other additives as required, and adding and mixing a predetermined amount of water. Examples thereof include a method in which the mixture is sufficiently stirred and mixed with a high-speed stirrer, and then finely pulverized and dispersed using a wet pulverizer such as a dynomill and a microfluidizer.

  In one embodiment of the production method when the agrochemical composition is an oily suspension, phenoxasulfone, polyvinylpyrrolidone, and other additives used as necessary are dispersed in vegetable oil, paraffinic mineral oil, etc. Examples thereof include a method in which the medium is sufficiently stirred and mixed with a high-speed stirrer, and then finely pulverized and dispersed using a wet pulverizer such as a dynomill or a microfluidizer.

  One embodiment of the production method when the agrochemical preparation is an emulsion is exemplified by a method in which phenoxasulfone, polyvinylpyrrolidone, a surfactant and other additives added as desired are dissolved in a liquid carrier such as an organic solvent. The

  The agricultural chemical composition of the present invention obtained as described above is an elution control type agricultural chemical composition capable of suppressing the dissolution of phenoxasulfone in water.

  Although the usage method of the agrochemical composition of this invention is based also on the dosage form, it is not specifically limited. For example, water surface treatment, foliage treatment, irrigation treatment, etc. on a flooded rice field can be mentioned.

  The agrochemical composition of the present invention can control annual weeds and perennial weeds generated in paddy fields over a wide range of growth periods from before germination. In particular, monocotyledonous plants such as Tainubie, Inobie, and Azegaya that occur in paddy fields, dicotyledonous plants such as Kogi, Azena, and Choutaitade, as well as annual perennial weeds such as the crabs and cypresses, and the perennial weeds and crabss such as the firefly crabs and the firefly Moreover, many perennial weeds such as Omodaka and Krogwei, which are usually difficult to control, can be controlled.

  In addition, various weeds that are problematic in non-agricultural fields such as fields, no-tillage cultivated land, roads, parks, slopes, gardens or mountain forests, such as Inobie, Barnyard grass, Enocologosa, Vulgaris, Johnsongrass, Vulgaris Indigenous weeds such as wild oats, perennials such as giant blackbirds, greenfish, white-tailed beetles, yellowtails, tiger beetles, broad-leaved weeds of common horned beetles, ragweeds, morning glory Excellent herbicidal effect on annual cyperaceae weeds.

  Although the application amount of the agrochemical composition of the present invention is not particularly limited, it is usually 10 to 1000 g, preferably 30 to 400 g, more preferably 75 to 200 g as phenoxasulfone per hectare of farmland. Is set.

  As described above, in the agricultural chemical composition containing phenoxasulfone, by adding polyvinylpyrrolidone, it becomes possible to suppress elution of phenoxasulfone when the agricultural chemical composition is applied. Such a phenoxasulfone elution control method can be applied to agrochemical formulations of various dosage forms.

  Polyvinyl pyrrolidone has been used for the purpose of increasing the solubility by making an agrochemical active ingredient amorphous, but it has become clear that it has an anti-elution action on phenoxasulfone. It was. Therefore, polyvinylpyrrolidone can be used as an elution control agent for phenoxasulfone. This elution inhibitor is 0.05-2 parts, preferably 0.1-1 part, more preferably 0.125-0.625 part, particularly preferably 0.2, as polyvinylpyrrolidone with respect to 1 part of phenoxasulfone. By using in the range of -0.4 part, the elution in the water can be suppressed.

  Examples The present invention will be described in more detail with reference to examples and the like, but the present invention is not limited to these examples.

[Example 1]
8 parts phenoxasulfone, 2 parts pyrimylsulfan, 12 parts benzobicyclone, 3 parts polypropylene glycol, 2 parts dialkylaryl sulfonate, 5 parts starch-crosslinked phosphate, 2 parts polyoxyethylene alkynyl glycol, polyacrylonitrile polymerization 2 parts hollow body with a wall material, 5 parts bentonite, 1 part sodium sulfate, 5 parts polyvinylpyrrolidone having a K value of about 30, 15 parts diatomaceous earth, 2 parts calcium carbonate, 36 parts clay And then kneading, extruding and granulating using a screen with a pore diameter of 5 mm, sizing and drying, a substantially cylindrical granular pesticide composition with a short diameter of 5 mm, an aspect ratio of 1-3, and the entire surface being a curved surface I got a thing. The agrochemical composition had a specific gravity of about 0.3 and had the property of disintegrating on the water surface within 20 minutes after being dropped on the water surface.

[Example 2]
8 parts phenoxasulfone, 2 parts pyrimylsulfan, 12 parts benzobicyclone, 3 parts polypropylene glycol, 2 parts dialkylaryl sulfonate, 5 parts starch-crosslinked phosphate, 2 parts polyoxyethylene alkynyl glycol, polyacrylonitrile polymerization 2 parts hollow body with a wall material, 5 parts bentonite, 1 part sodium sulfate, 5 parts polyvinylpyrrolidone with K value of about 30, 10 parts urea, 15 parts diatomaceous earth, 2 parts calcium carbonate and 26 parts clay Then, a predetermined amount of water is added and kneaded, extruded and granulated using a screen having a pore diameter of 5 mm, sized and dried, and has a short diameter of 5 mm, an aspect ratio of 1 to 3, and a substantially cylindrical shape whose entire surface is a curved surface. A granular agrochemical composition was obtained. The agrochemical composition had a specific gravity of about 0.3 and had the property of disintegrating on the water surface within 20 minutes after being dropped on the water surface.

[Example 3]
8 parts phenoxasulfone, 2 parts pyrimylsulfan, 12 parts benzobicyclone, 3 parts polypropylene glycol, 2 parts dialkylaryl sulfonate, 5 parts starch-crosslinked phosphate, 2 parts polyoxyethylene alkynyl glycol, polyacrylonitrile polymerization 2 parts of hollow body made of a material, 5 parts of bentonite, 1 part of sodium sulfate, 3 parts of polyvinylpyrrolidone having a K value of about 30, 9 parts of calcium carbonate and 46 parts of clay are added, and a predetermined amount of water is added. Kneaded, extruded and granulated using a screen with a pore diameter of 5 mm, sized and dried to obtain a substantially cylindrical granular agricultural chemical composition having a short diameter of 5 mm, an aspect ratio of 1 to 3, and a curved surface as a whole. . The agrochemical composition had a specific gravity of about 0.3 and had the property of disintegrating on the water surface within 20 minutes after being dropped on the water surface.

[Example 4]
8 parts of phenoxasulfone, 2 parts of pyrimisulphan, 12 parts of benzobicyclone, 3 parts of polypropylene glycol, 2 parts of dialkylaryl sulfonate, 3 parts of alkylaryl sulfonate, 5 parts of phosphate cross-linked starch, polyoxyethylene alkynyl 2 parts of glycol, 2 parts of hollow body made of polyacrylonitrile-based polymer, 5 parts of bentonite, 1 part of sodium sulfate, 2 parts of polyvinylpyrrolidone having a K value of about 30, 15 parts of diatomaceous earth, 2 parts of calcium carbonate, clay 36 parts are mixed, kneaded with a predetermined amount of water, extruded and granulated using a screen with a pore diameter of 5 mm, granulated, dried, short diameter 5 mm, aspect ratio 1-3, the entire surface from a curved surface A substantially cylindrical granular agricultural chemical composition was obtained. The agrochemical composition had a specific gravity of about 0.3 and had the property of disintegrating on the water surface within 20 minutes after being dropped on the water surface.

[Example 5]
8 parts phenoxasulfone, 2 parts pyrimylsulfan, 12 parts benzobicyclone, 3 parts polypropylene glycol, 2 parts dialkylaryl sulfonate, 5 parts starch-crosslinked phosphate, 2 parts polyoxyethylene alkynyl glycol, polyacrylonitrile polymerization 2 parts hollow body with a wall material, 5 parts bentonite, 1 part sodium sulfate, 3 parts polyvinyl pyrrolidone having a K value of about 90, 15 parts diatomaceous earth, 2 parts calcium carbonate, 38 parts clay And then kneading, extruding and granulating using a screen with a pore diameter of 5 mm, sizing and drying, a substantially cylindrical granular pesticide composition with a short diameter of 5 mm, an aspect ratio of 1-3, and the entire surface being a curved surface I got a thing. The agrochemical composition had a specific gravity of about 0.3 and had the property of disintegrating on the water surface within 30 minutes after being dropped on the water surface.

[Example 6]
Mix 2 parts of phenoxasulfone, 0.5 part of alkyl aryl sulfonate, 1 part of dextrin, 2 parts of sodium tripolyphosphate, 2 parts of polyvinylpyrrolidone with K value of about 90, 25 parts of bentonite, 67.5 parts of calcium carbonate Then, a predetermined amount of water was added and kneaded, extruded and granulated using a screen having a pore diameter of 1 mm, sized and dried to obtain a granular agricultural chemical composition having a minor diameter of 1 mm. The agrochemical composition had a specific gravity of about 1 and had the property of sinking and landing when dropped on the water surface and disintegrating in water.

[Comparative Example 1]
8 parts phenoxasulfone, 2 parts pyrimylsulfan, 12 parts benzobicyclone, 3 parts polypropylene glycol, 2 parts dialkylaryl sulfonate, 5 parts starch-crosslinked phosphate, 2 parts polyoxyethylene alkynyl glycol, polyacrylonitrile polymerization 2 parts of hollow body with a wall material, 5 parts of bentonite, 1 part of sodium sulfate, 2 parts of polyacrylate, 1 part of sodium carboxymethylcellulose, 15 parts of diatomaceous earth, 2 parts of calcium carbonate, 38 parts of clay, A fixed amount of water is added and kneaded, extruded and granulated using a screen with a pore diameter of 5 mm, sized and dried, and is a substantially cylindrical granular pesticide with a short diameter of 5 mm, an aspect ratio of 1 to 3, and a curved surface. A composition was obtained. The agrochemical composition had a specific gravity of about 0.3 and had the property of disintegrating on the water surface within 20 minutes after being dropped on the water surface.

[Comparative Example 2]
8 parts phenoxasulfone, 2 parts pyrimylsulfan, 12 parts benzobicyclone, 3 parts polypropylene glycol, 2 parts dialkylaryl sulfonate, 5 parts starch-crosslinked phosphate, 2 parts polyoxyethylene alkynyl glycol, polyacrylonitrile polymerization 2 parts hollow body with a wall material, 5 parts bentonite, 1 part sodium sulfate, 2 parts polyacrylate, 1 part sodium carboxymethylcellulose, 15 parts diatomaceous earth, 9 parts calcium carbonate, 31 parts clay, A fixed amount of water is added and kneaded, extruded and granulated using a screen with a pore diameter of 5 mm, sized and dried, and is a substantially cylindrical granular pesticide with a short diameter of 5 mm, an aspect ratio of 1 to 3, and a curved surface. A composition was obtained. The agrochemical composition had a specific gravity of about 0.3 and had the property of disintegrating on the water surface within 20 minutes after being dropped on the water surface.

[Comparative Example 3]
8 parts phenoxasulfone, 2 parts pyrimylsulfan, 12 parts benzobicyclone, 3 parts polypropylene glycol, 2 parts dialkylaryl sulfonate, 5 parts starch-crosslinked phosphate, 2 parts polyoxyethylene alkynyl glycol, polyacrylonitrile polymerization 2 parts of a hollow body made of a material, 5 parts of bentonite, 1 part of sodium sulfate, 2 parts of polyacrylate, 1 part of sodium carboxymethylcellulose, 9 parts of calcium carbonate and 46 parts of clay are mixed, and a predetermined amount of water is mixed. In addition, the mixture is kneaded, extruded and granulated using a screen having a pore diameter of 5 mm, sized and dried to obtain a substantially columnar granular agricultural chemical composition having a short diameter of 5 mm, an aspect ratio of 1 to 3, and a curved surface as a whole. It was. The agrochemical composition had a specific gravity of about 0.3 and had the property of disintegrating on the water surface within 20 minutes after being dropped on the water surface.

[Comparative Example 4]
8 parts of phenoxasulfone, 2 parts of pyrimisulphan, 12 parts of benzobicyclone, 3 parts of polypropylene glycol, 2 parts of dialkylaryl sulfonate, 3 parts of alkylaryl sulfonate, 5 parts of phosphate cross-linked starch, polyoxyethylene alkynyl 2 parts of glycol, 2 parts of hollow body made of polyacrylonitrile polymer, 5 parts of bentonite, 1 part of sodium sulfate, 2 parts of polyacrylate, 1 part of sodium carboxymethylcellulose, 15 parts of diatomaceous earth, 2 parts of calcium carbonate, 35 parts of clay are mixed, kneaded with a predetermined amount of water, extruded and granulated using a screen with a hole diameter of 5 mm, granulated, dried, minor axis 5 mm, aspect ratio 1-3, the entire surface is curved A substantially cylindrical granular pesticide composition was obtained. The agrochemical composition had a specific gravity of about 0.3 and had the property of disintegrating on the water surface within 20 minutes after being dropped on the water surface.

[Comparative Example 5]
8 parts of phenoxasulfone, 2 parts of pyrimylsulfan, 12 parts of benzobicyclone, 3 parts of polypropylene glycol, 3 parts of alkyl aryl sulfonate, 2 parts of dialkylaryl sulfonate, 5 parts of phosphate cross-linked starch, polyoxyethylene alkynyl 2 parts of glycol, 2 parts of hollow body made of polyacrylonitrile-based polymer, 1 part of sodium carboxymethylcellulose, 5 parts of bentonite, 1 part of sodium sulfate, 9 parts of calcium carbonate and 45 parts of clay are mixed with a predetermined amount of water. Are added, kneaded, extruded and granulated using a screen having a pore diameter of 5 mm, sized and dried to obtain a substantially cylindrical granular agricultural chemical composition having a short diameter of 5 mm, an aspect ratio of 1 to 3, and a curved surface as a whole. Obtained. The agrochemical composition had a specific gravity of about 0.3 and had the property of disintegrating on the water surface within 20 minutes after being dropped on the water surface.

[Comparative Example 6]
2 parts of phenoxasulfone, 0.5 part of alkyl aryl sulfonate, 1 part of dextrin, 2 parts of sodium tripolyphosphate, 25 parts of bentonite, 69.5 parts of calcium carbonate are added and kneaded with a predetermined amount of water, Extrusion granulation was performed using a screen having a pore diameter of 1 mm, sizing and drying to obtain a granular agricultural chemical composition having a minor diameter of 1 mm. The agrochemical composition had a specific gravity of about 1 and had the property of sinking and landing when dropped on the water surface and disintegrating in water.

[Test Example 1]
50 mg of the granular agricultural chemical composition of Example 1-5 and Comparative Example 1-5 was weighed and poured into 4 L of 3 ° hard water adjusted to 20 ° C., and then allowed to stand at a constant temperature of 20 ° C. Water was collected over time, and the concentration of phenoxasulfone in water after a predetermined time was quantified by HPLC under the following conditions. The results are shown in Table 1-2.

(HPLC conditions)
HPLC measurement was performed by the following absolute calibration curve method.
Column: Column with a chemically bonded porous spherical silica gel whose surface is modified with a hydrophobic group Column temperature: 40 ° C.
Eluent: A mixture of acetonitrile, methanol, and phosphoric acid aqueous solution

  From Table 1, all of the comparative examples reached a high concentration of 140 ppb or more after 1 day of treatment, and gradually increased until 7 days later, whereas in the examples, the concentration after 1 day of treatment was about 60% of that of the comparative example. Although it was suppressed to ˜40% and continued to elute thereafter, it was maintained in a concentration range lower than that of the comparative example until 7 days after the treatment, indicating that it can contribute to the reduction of phytotoxicity.

[Test Example 2]
17 mg of the granular agricultural chemical composition of Example 6 and Comparative Example 6 was weighed and poured into 0.7 L of 3 ° hard water adjusted to 20 ° C., and then allowed to stand at a constant temperature of 20 ° C. Water was collected over time, and the concentration of phenoxasulfone in water after a predetermined time was quantified by HPLC under the same conditions as in Test Example 1. The results are shown in Table 2.

  In Example 6, the elution amount of phenoxasulfone was suppressed as compared with Comparative Example 6, and the concentration in water remained 1/2 to 1/3 that of Comparative Example until 7 days after the treatment, and was stably maintained in a low concentration range. Therefore, it was shown that it can contribute to the reduction of drug damage.

The agrochemical composition of the present invention can control the elution of phenoxasulfone in water without performing a complicated treatment, and thus is useful as a pesticide formulation for paddy rice with reduced risk of phytotoxicity while maintaining a biological effect.

Claims (9)

  An agrochemical composition containing phenoxasulfone and polyvinylpyrrolidone.   The agrochemical composition according to claim 1, comprising 0.05-2 parts by mass of polyvinylpyrrolidone with respect to 1 part by mass of phenoxasulfone in the agrochemical composition. When the viscosity of a 1% by weight aqueous solution of polyvinylpyrrolidone was measured with a capillary viscometer at 25 ° C., the following formula (I):

(Where c is the number of grams of polyvinylpyrrolidone in 100 mL of the solution, and η _rel is the relative viscosity of the solution with respect to water.)
The agrochemical composition according to claim 1 or 2, wherein the K value defined by the formula is 10-110.   The agrochemical composition according to any one of claims 1 to 3, which is a granular material.   Furthermore, it contains a surfactant, a hollow body, and a solid support, and is molded by an extrusion granulation method, has a short diameter of 3-8 mm, an aspect ratio of 1-3, and a substantially cylindrical or substantially spherical shape whose entire surface is a curved surface. 5. The agrochemical composition according to claim 4, comprising a shape appearance, a specific gravity of 0.3-1 and a property of collapsing on the water surface within 30 minutes after being dropped on the water surface.   The agrochemical composition according to claim 5, wherein the polyvinylpyrrolidone has a K value of 10-50.   An elution suppression type agricultural chemical composition containing phenoxasulfone and polyvinylpyrrolidone.   A phenoxasulfone elution control agent containing polyvinylpyrrolidone as an active ingredient. A method for controlling the dissolution of phenoxasulfone, comprising adding polyvinylpyrrolidone to a pesticidal composition containing phenoxasulfone as an agrochemical active ingredient.