JP5395057B2 - Pesticide composition that can be suspended in water - Google Patents

Description

  The present invention relates to a stable, water-suspendable pesticide composition that can reduce the contact phytotoxicity of useful plant crops, particularly rice crops. The present invention further relates to a method for controlling undesired plant growth in useful plant crops, in particular rice crops, and to the use of said composition for controlling grass and weeds in useful plant crops, in particular rice crops. Also related.

  The formulation according to the invention comprises a mixture of two or more active ingredients having different physical properties. They are designed to avoid hydrolysis, precipitation and agglomeration of all active ingredients while ensuring proper dispersion, suspension, emulsification or combinations thereof.

  However, despite exhibiting good stability even when stored for a long time because hydrolysis, precipitation and aggregation are suppressed, pretilachlor, chloroacetamide herbicide, bensulfuron-methyl, sulfonylurea herbicide, pyriftalide, An aqueous liquid composition comprising a herbicide based on pyrimidinyloxybenzoate, an oil phase, at least one antifreeze, at least one surfactant, biocide, pH adjuster, thickener, and antifoam. The product exhibits unexpected contact phytotoxicity on useful plant crops, especially rice leaves.

  As a result of extensive studies focusing on the above problems, the inventors of the present invention have found that the occurrence of contact phytotoxicity to rice leaves is essentially due to the presence of pretilachlor. Furthermore, the present inventors have also found that the presence of liquid paraffin as an oil phase and propylene glycol as an antifreeze in the preparation increases the phytotoxicity of pretilachlor due to their synergistic effect.

  Surprisingly, the problem is that at least one polyol compound containing at least three hydroxyl groups is used as an antifreeze instead of propylene glycol containing only two hydroxyl groups, and soy oil instead of liquid paraffin Was used as the oil phase, thereby completing the present invention. Surprisingly, soybean oil does not show a negative synergistic effect on liquid paraffin pretilachlor in the oil phase described above. Similarly, instead of propylene glycol containing only two hydroxyl groups (propane-1,2-diol), glycerol containing three hydroxyl groups or polyvinyl alcohol containing three or more hydroxyl groups is used as an antifreeze. Doing so strongly reduces the contact damage of pretilachlor to rice leaves and provides an unexpected safety effect. On the other hand, the use of ethylene glycol (ethane-1,2-diol) containing only two hydroxyl groups as an antifreeze results in strong contact injury to rice leaves.

Therefore, this application includes the following inventions.
In a first aspect, the present invention is a water suspension comprising at least one liquid pesticide ingredient, at least one solid pesticide ingredient, at least one oil and at least one polyol compound comprising at least three hydroxyl groups. A possible agrochemical composition is provided.

  In a first aspect, the present invention provides a water-suspendable pesticidal composition wherein the oil is selected from the group consisting of mineral oil, vegetable oil, fatty acid ester, epoxidized vegetable oil and liquid paraffin.

  In a second aspect, the present invention provides a water-suspendable pesticidal composition, wherein the oil is a vegetable oil.

  In a third aspect, the present invention provides an agrochemical composition suspendable in water, wherein the vegetable oil is soybean oil.

  In a fourth aspect, the present invention provides a water-suspendable pesticidal composition, wherein the polyol compound is glycerol.

  In a fifth aspect, the present invention provides a water suspendable pesticidal composition comprising at least one nonionic surfactant.

  In a sixth aspect, the present invention provides an agrochemical composition suspendable in water, wherein the nonionic surfactant is a polyoxyethylene-polyoxypropylene block polymer.

  In a seventh aspect, the present invention provides a suspendable pesticide composition in water, wherein the liquid or solid pesticide component is at least one herbicide.

  In an eighth aspect, the present invention provides a suspendable pesticide composition in water, wherein the liquid or solid pesticide component is at least one insecticide.

  In a ninth aspect, the present invention provides a water suspendable pesticide composition wherein the liquid or solid pesticide component is at least one bactericidal agent.

  In a tenth aspect, the present invention provides a water suspendable pesticide composition comprising at least one bactericidal agent and at least one insecticide as a pesticide component.

  In an eleventh aspect, the present invention provides an agrochemical composition suspendable in water, wherein the at least one liquid agrochemical component is a herbicide based on chloroacetamide.

  In a twelfth aspect, the present invention provides a suspendable pesticide composition in water, wherein the chloroacetamide based herbicide is pretilachlor.

  In a thirteenth aspect, the present invention provides an agrochemical composition that can be suspended in water, wherein the solid agrochemical component is a herbicide based on sulfonylurea.

  In a fourteenth aspect, the present invention provides a suspendable pesticide composition in water, wherein the sulfonylurea based herbicide is bensulfuron-methyl.

  In a fifteenth aspect, the present invention provides a water-suspendable pesticide composition further comprising a herbicide based on pyriftalide, pyrimidinyloxybenzoate as a solid pesticide component.

  In a second aspect, the present invention provides a method for controlling undesired plant growth in useful plant crops, particularly in rice crops, the method comprising a pesticidal composition suspendable in an effective amount of water. Allowing the object to act where control is desired.

  In a third aspect, the present invention provides the use of a water suspendable pesticide composition to control grass and weeds in useful plant crops, particularly in rice crops.

  In a fourth aspect, the present invention provides a pesticide according to the present invention by mixing oil in a water suspendable pesticide composition comprising at least one liquid pesticide component and at least one solid pesticide component. A method for preparing a composition is provided.

  In a fifth aspect, the present invention provides the use of at least one polyol comprising at least three hydroxyl groups in a composition according to the present invention to reduce the contact damage of pretilachlor to the leaves of useful plant crops. .

  In one aspect, the present invention provides the use of glycerol as a polyol containing at least three hydroxyl groups to reduce the contact damage of pretilachlor to the leaves of useful plant crops.

  In another aspect, the present invention relates to at least one polyol in admixture with soybean oil in a composition according to the invention in order to reduce the contact damage of pretilachlor to the leaves of useful plant crops, especially in rice crops. In particular, the use of glycerol is provided.

  The present invention relates to a suspendable pesticide composition in water comprising at least one liquid pesticide ingredient, at least one solid pesticide ingredient, at least one oil and at least one polyol antifreeze containing at least three hydroxyl groups. And sufficient dispersion, suspension, emulsification or combination thereof of these ingredients is ensured, so that hydrolysis, precipitation and aggregation are suppressed even when stored for long periods of time.

  Liquid pesticide ingredients that can be used in the water suspendable pesticide compositions claimed in the present invention are those at room temperature and normal pressure (such as temperature during composition manufacture) in the composition or spray liquid. Or, depending on the specific case, there is no particular limitation as long as it is an agrochemical component in a glassy oil or liquid state at a temperature up to about 50 ° C. Typical examples include compounds based on chloroacetamide, such as pretilachlor, compounds based on carbamate and compounds based on dinitroaniline. In addition, the liquid pesticide ingredient of the present invention includes components that are solid at room temperature when in a pure form and that are oily in purity and commonly used in pesticide compositions. The agrochemical component may be, for example, a herbicide, bactericidal agent, fungicide, nematicide, parasiticide or other biocide. The liquid agrochemical component is preferably a herbicide, insecticide, bactericide or insecticide / fungicide, particularly preferably a herbicide.

  Examples of liquid herbicides include but are not limited to pretilachlor (656), metolachlor (548), prodiamine (661), esprocarb (303), prosulfocarb (683), triclopyr (827), fluazihop (681), Obencarb (595), molinate (560), dimetinamide (260), pelargonic acid (583), dalapon (214), piperophos (560), butamifos (102), glyphosate-trimesium (419), cetoxydim (726 ), Cretodim (153), S-metolachlor (549) and cinmethylin (153). In the present invention, chloroacetamide-based herbicides pretilachlor (656) and metolachlor (548) are preferred, and those having pretilachlor are particularly preferred. These compounds and their agriculturally acceptable salts are published, for example, in "The e-Pesticide Manual", 3.1 edition, volume 13, Ed. CDC Tomlin, British Crop Protection Council, 2004-2005.

  Examples of liquid insecticides include, but are not limited to, cyanophos (184), fenthion (346), fenitrothion (335), dichlorofenthion (1051), pyrimiphos-methyl (1345), diazinon (227), isoxathion (480), oxy Deprofos (1324), malathion, phentoate (631), formothion (1192), thiomethone (801), disulfoton (278), prothiophos (686), sulfophos (1408), propenofos (propenofos), pyracrofos (689), dichlorvos ( 236), nared (657), chlorfenvinphos (131), propaphos (1356), isofenphos (1236), ethion (309), carbosulfan (119), benfracarb (60), allethrin (17), permethrin ( 626), cyhalothrin (196), cyfluthrin (193), fenvalerate (349), flucitrinate (367), fulvalinate (1184), cycloprotorin (188), silafluophene (728), Roparugitto (671), halfenprox (424), including ethoprophos (312) and fosthiazate (408). These compounds and their agriculturally acceptable salts are published, for example, in "The e-Pesticide Manual", 3.1 edition, volume 13, Ed. CDC Tomlin, British Crop Protection Council, 2004-2005.

  Examples of other liquid pesticide ingredients are liquid bactericides, and in particular calcium polysulfide (111), edifenphos (290), propiconazole (675), pefazoate (618), pyrifenox (703), tetraconazole (778), Echromesol (321), Dinocup (270) and Metalaxyl M (516). These compounds and their agriculturally acceptable salts are published, for example, in "The e-Pesticide Manual", 3.1 edition, volume 13, Ed. CDC Tomlin, British Crop Protection Council, 2004-2005.

  The liquid agrochemical component claimed in the present invention is particularly suitable for those having a low water solubility at a standard temperature and a standard pressure of 1000 mg / l or less, and preferably 500 mg / l or less. Examples of such liquid pesticide ingredients are pretilachlor (water-soluble: 50 mg / l), metolachlor (water-soluble: 488 mg / l), prodiamine (water-soluble: 0.013 mg / l), esprocarb (water-soluble: 4.9 mg) / l), prosulfocarb (water solubility: 13.2 mg / l) and metalaxyl M (water solubility: 26 mg / l).

  Said liquid agrochemical component is based on 100 parts by weight, preferably 0.1-60 parts by weight, and more preferably 5-40, based on the total weight of the suspendable agrochemical composition claimed in the present invention. Mixed in parts by weight.

  The solid agrochemical components that can be used in the water-suspendable agrochemical composition claimed in the present invention are those at room temperature and normal pressure (such as temperature during composition production) in the composition or in the spray liquid. As long as it is in a solid state, there is no particular limitation. Typical examples of these components include sulfonylurea based compounds. The agrochemical component can be, for example, herbicides, insecticides, bactericides, fungicides, nematicides, parasiticides and other biocides. The liquid agrochemical component is preferably a herbicide, insecticide, bactericide or insecticide / bactericide, and particularly preferably a herbicide.

  Examples of solid herbicides include but are not limited to bensulfuron-methyl (64), CNP (974), naproanilide (517), bifenox (75), pyributycarb (698), bromobutide (93), mefenacet (505), diimron (213), imazosulfuron (456), pyrazosulfuron-ethyl (694), cimethrin (732), promethrin (666), dimetamethrin (259), clomethoxynil, oxadiazone (600), pyrazolate (692), pyrazoxifene (695), clomeprop ( 160), Benzofenap (70), Tenilchlor (789), Oxadichromemephone (604), Pentoxazone (625), Caffentrol (110), Azimusulfuron (43), Pyriminobac-methyl (707), Fentrazamide (348) and Contains sodium salt (82). In the present invention, the herbicide based on sulfonylurea, bensulfuron-methyl (64), is particularly suitable. These compounds and their agriculturally acceptable salts are published, for example, in "The e-Pesticide Manual", 3.1 edition, volume 13, Ed. CDC Tomlin, British Crop Protection Council, 2004-2005.

  Examples of solid insecticides include but are not limited to imidacloprid (458), dinotefuran (271), thiamethoxam (792), acetamiprid (4), thiacloprid (791), nitenpyram (579), NAC (115), pyridafenthion (701) , Chlorpyrifos-methyl (146), dimethoate (262), acephate (2), cartap (123), thiocyclam (798), bensultap (66) and buprofezin (99). These compounds and their agriculturally acceptable salts are published, for example, in "The e-Pesticide Manual", 3.1 edition, volume 13, Ed. CDC Tomlin, British Crop Protection Council, 2004-2005.

  Examples of solid bactericides, and in particular solid fungicides, include but are not limited to cyprodinil (208), mepanipyrim (508), pyrimethanil (705), metalaxyl (516), mepronil (510), flutolanil (396), teclophthalam (766), Pencyclon (620), Dichromedin (239), Triflumizole (834), Kasugamycin (483), Validamycin (846), Probenazole (658), Isoprothiolane (474), Cyproconazole (207), Metoconazole ( 525), tricyclazole (828), pyroxylone (710), oxophosphate (606), ferrimzone (351), iprodione (470), triphorin (838), picoxystrobin (647), azoxystrobin (47), Includes Cresoxime-methyl (485), orissatrobin, pyraclostrobin (690), trifloxystrobin (832) and metminostrobin (551). These compounds and their agriculturally acceptable salts are published, for example, in "The e-Pesticide Manual", 3.1 edition, volume 13, Ed. CDC Tomlin, British Crop Protection Council, 2004-2005.

  Said solid agrochemical component is based on 100 parts by weight, preferably 0.1 to 60 parts by weight, and more preferably 0.1 to 40 parts by weight based on the total weight of the suspendable agrochemical composition claimed in the present invention. Mixed in parts by weight.

  The water-suspendable pesticide composition claimed in the present invention maintains the dispersibility and suspendability of the liquid pesticide component and the solid pesticide component, and suppresses the decomposition of the solid pesticide component by the liquid pesticide component. To contain at least one oil as an emulsion stabilizer. Examples of this oil are spindle oils, machine oils and mineral oils such as liquid paraffin, aromatic solvents such as Solvesso and Shellsol, rapeseed oil, soybean oil, sunflower seed oil, castor oil, pine oil and cottonseed oil Vegetable oils such as, and derivatives of these oils such as methyl esters and other ester derivatives, epoxidized derivatives and fatty acid esters, and these may be used alone or in combination. Particularly preferred oils in the present invention are vegetable oils. A particularly preferred vegetable oil in the present invention is soybean oil. These oils are preferably 0.1 to 30 parts by weight, and more preferably 1 to 10 parts by weight, based on 100 parts by weight based on the total weight of the suspendable pesticide composition claimed in the present invention. In the amount of.

  In addition to each said component, the water-suspendable pesticidal composition claimed in the present invention further essentially comprises at least one antifreeze containing at least three hydroxyl groups, such as glycerol, polyvinyl alcohol, Pentaerythrol, saccharides, polysaccharides, dextrin or cellulose derivatives, preferably glycerol or polyvinyl alcohol, more preferably glycerol.

  The water suspendable pesticidal composition claimed in the present invention preferably comprises at least one surfactant. Examples of suitable surfactants are polyoxyethylene-polyoxypropylene block polymers such as polyoxyethylene-polyoxypropylene (POE-POP) block polymers and alkyl polyoxyethylene-polyoxypropylene block polymer ethers. A polyoxyethylene-polyoxypropylene (POE-POP) block polymer is particularly suitable, although including molds. The use of the surfactant is preferable because it enables sufficient emulsification of the liquid pesticide component and sufficient dispersion of the solid pesticide component, and suppresses the decomposition of the solid pesticide component by the liquid pesticide component. The surfactant is preferably from 0.01 to 10 parts by weight, and more preferably from 0.1 to 5 parts by weight, based on 100 parts by weight based on the total weight of the suspendable agrochemical composition claimed in the present invention. Mixed in parts quantity.

  Suitable surfactants are POE-POP block polymers, and those having an average molecular weight of 10,000 or more and an ethylene oxide weight ratio of 50% or more (Epan U-108, Daiichi Kogyo Seiyaku, etc.) are particularly suitable. This is because they can suppress the occurrence of aggregation under strict test conditions. However, even those having an average molecular weight of 10,000 or less, or an ethylene oxide weight ratio of 50% or less can achieve sufficient liquid component emulsification and inhibit the degradation of the solid active component. Furthermore, the combined use of multiple POE-POP block polymers having different average molecular weights or different ethylene oxide weight ratios makes it possible to obtain compositions having the desired physical properties.

  Still other surfactants may also be incorporated into the water suspendable pesticidal composition claimed in the present invention. Examples of such other surfactants include polyoxyalkylene tristyryl phenol, polyethylene glycol higher fatty acid ester, polyoxyalkylene alkyl ether, polyoxyalkylene alkyl aryl ether, polyoxyalkylene aryl phenyl ether, sorbitan alkylate, acetylene alcohol, Nonionic surfactants such as acetylenic diols and their alkylene oxide adducts, polyalkylene sorbitan alkylates, polyalkyl glycosides, sucrose fatty acid esters and polyalkylene alkyl amines, alkyl aryl sulfonates, dialkyl sulfonates, lignin Sulfonates, alkylated or non-alkylated naphthalene sulfonates and their condensation products, alkyl sulfates and Ester salts, alkyl phosphate esters and ester salts, alkyl aryl sulfate esters and ester salts, alkyl aryl phosphate esters and ester salts, polyoxyethylene alkyl ether sulfate esters and ester salts, polyoxyethylene alkyl aryl sulfate esters and ester salts, Anionic surfactants such as polyoxyethylene arylphenyl ether sulfates and ester salts and polycarboxylic acid polymer activators, silicone based surfactants, fluorine based surfactants and alkylbetaines Amphoteric surfactants and cationic surfactants such as alkylmethylammonium salts and polyoxyalkylene alkylmethylammonium salts. In a preferred form, the water suspendable pesticidal composition claimed in the present invention comprises polyoxyethylene tristyrylphenol as another surfactant. This surfactant is preferably based on 100 parts by weight, preferably 0.001-10 parts by weight, and more preferably 0.01-1 parts by weight, based on the total weight of the suspendable agrochemical composition claimed in the present invention. Mixed in parts quantity.

In addition to each of the above components, the water suspendable pesticide compositions claimed in the present invention also include common excipients typically used in water suspendable pesticide compositions . Examples of such excipients include antifoaming agents such as silicone, antifungal agents such as 1,3-benzisothiazolin-3-one and other benzisothiazolinone compounds, pH adjusting agents such as K ₂ PO ₄ , xanthan gum , Including thickeners such as silica and bentonite, inert carriers such as clay, diatomaceous earth and calcium carbonate, preservatives, binders, fertilizers and other active ingredients.

  The water-suspendable pesticidal composition claimed in the present invention is obtained by directly mixing the active ingredient with the mixing excipient and the liquid or solid carrier and / or crushing them together. Can be prepared using conventional methods such as

  Suitably, the suspendable pesticide composition claimed in the present invention may be prepared in the manner described below.

(a) Concentrated pulverized slurry composition of solid agrochemical components Various surfactants and other auxiliaries (assistants are formulation aids, for example, inert materials, components), water Mix by dissolving or dispersing in followed by addition of solid agrochemical ingredients. Thereafter, the mixture is appropriately wet pulverized by a bead mill such as a batch type bead mill to prepare a concentrated slurry.

(b) Emulsified composition of liquid pesticide ingredients Various surfactants and other auxiliaries (assistants are formulation aids such as inert materials, ingredients) are mixed in water. While forcibly stirring with a homogenizer or the like, the oil phase in which the oil is dissolved is added to the liquid agrochemical component, and the oil phase is emulsified in the aqueous phase. Thereafter, the mixture is properly and forcibly emulsified to the desired particle size.

(c) Manufacture of the composition The slurry of the solid agrochemical component is added to the liquid agrochemical component emulsion (the ratio of the emulsion to the slurry is, for example, 9: 1), and then appropriately mixed with a mixer or the like to obtain the composition.

  The herbicidal formulation according to the agrochemical composition that can be suspended in water claimed in the present invention is suitable for controlling paddy weeds in water. This is preferably done by applying the desired amount of the suspendable pesticide composition in the present invention directly or directly to the paddy field after dilution to the appropriate concentration with water. Alternatively, it is carried out by adding to the water flowing into the paddy field (i.e. a spout process). Furthermore, the water-suspendable pesticidal composition claimed in the present invention can be applied simultaneously with planting by a planter.

  The water-suspendable pesticidal composition claimed in the present invention can be applied in the same manner as normal spraying, but can also be diluted into larger amounts of water. The water-suspendable pesticidal composition claimed in the present invention can be used preferably in an application amount of 100 to 50,000 ml / ha, and more preferably 1,000 to 10,000 ml / ha.

  The herbicidal formulation according to the claimed suspendable pesticide composition in the present invention can be used against a large number of agronomically important weeds. The weeds to be controlled are for example Alisma species, Leptochloa chinensis, Stellaria, Nasturtium, Agrostis, Digitaria, Avena, Setaria ( Setaria, Sinapis, Lolium, Solanum, Echinochloa and especially Echinochloa crus-galli or Echinochloa oryzicola, especially Sirpath Scirpus juncoides, Monochoria and especially Monochoria vaginalis, Sagittaria and especially Sagittalia pygmea, Bromus, Alopecurus, Gum ), Rottboellia, Cyperus and especially Cyperus Cyperus iria, Abutilon, Sida, Xanthium, Amaranthus, Chenopodium, Ipomoea, Chrysanthemum, Gallium, Viola And monocotyledonous and dicotyledonous weeds such as Veronica.

  Useful plant crops that can be used in the combinations according to the invention include, in particular, rice. The term “crop” further includes crops that have become resistant to herbicides or herbicide classifications (eg, ALS, GS, EPSPS, PPO and HPPD inhibitors) as a result of conventional breeding or genetic engineering methods. Understood as a thing. An example of a crop that has become resistant to imidazolinones, such as imazamox, by conventional breeding methods is Clearfield ™ Summer Leip (Canola). Examples of crops that have become resistant to herbicides by genetic engineering methods include, for example, glyphosate- and glufosinate-resistant corn varieties commercially available under the trade names RoundupReady ™ and LibertyLink ™.

  Furthermore, as crops that have become resistant to pests by genetic engineering methods, for example, Bt corn (resistance to European corn borer), Bt cotton (resistance to cotton weevil) and Bt potato (resistance to Colorado potato beetle) Should also be understood. An example of Bt corn is the Bt-176 corn hybrid from NK ™ (Syngenta Seeds). Bt toxin is a protein naturally formed by Bacillus thuringiensis soil bacteria. Examples of toxins and transgenic plants can be handled comprehensively, such toxins are EP-A-451 878, EP-A-374 753, WO 93/07278, WO 95/34656, WO 03/052073 and Published in EP-A-427 529. Examples of transgenic plants containing one or more genes encoding insecticide resistance and expressing one or more toxins are KnockOut ™ (corn), Yield Gard ™ (corn), NuCOTIN33B (Trademark) (cotton), Bollgard (trademark) (cotton), NewLeaf (trademark) (potato), NatureGard (trademark) and Protexcta (trademark). Plant crops and their seed materials are resistant to herbicides as well as to insect feeding ("stacked" transgenic events). Seeds can be glyphosate resistant while at the same time having the ability to express, for example, insecticidally active Cry3 protein. The term “crop” is understood to further include crops obtained as a result of conventional breeding or genetic engineering methods containing so-called product characteristics (eg improved aroma, storage stability, nutrient content). It should be.

  The following provides a more detailed explanation of the invention through examples of the invention. The present invention is not limited to these examples.

Preliminary phototoxicity test The purpose of the following phototoxicity test was to detect on the one hand the main factors related to contact phototoxicity caused by transplanted rice and to investigate the effects of candidate materials on crop safety for the formulations according to the invention. It is to be.

Table 1: Factors affecting phototoxicity caused by direct contact with droplets The purpose of the following test is to identify factors that affect phototoxicity caused by direct contact of droplets with transplanted rice. .

  For the test, a rice crop (variety Koshihikari) is used and placed in a plastic pot (100 cm plastic pot / clay loam soil). The crop condition in application is about 4.5 leaf stages. 2.5 microL / leaf is applied (on the fourth leaf) by using a micropipette. The test is repeated twice.

DAAとは、適用後の日数(days after application)を意味する。

DAA means days after application.

  Pretilachlor itself at the test concentration is one of the most important factors in the observed contact phototoxicity, and liquid paraffin and propylene glycol are highly phytotoxic when applied together with pretilachlor, and are largely Bean oil is better than liquid paraffin in the oil phase with respect to phototoxicity.

Table 2: Factors influencing phototoxicity caused by direct contact with droplets The purpose of the test is to verify the effects of crop safety in soybean oil and / or glycerol transplanted rice present in formulations according to the present invention It is to be.

  For the test, a rice crop (cv. Koshihikari) is used and placed in a plastic pot (100 cm plastic pot / clay loam soil). The crop condition in application is about 4.5 leaf stages. 2.5 microL / leaf is applied (on the fourth leaf) by using a micropipette. The test is repeated twice.

DAAとは、適用後の日数(days after application)を意味する。

DAA means days after application.

  The combination of soybean oil and glycerol at the test concentration is much safer than the combination of liquid paraffin and propylene glycol. Glycerol is therefore essential for suppressing early phytotoxic signs. Furthermore, phototoxicity decreases slightly with increasing glycerol content.

Pesticide compositions that can be suspended in water Table 3: Preparation of agrochemical compositions that can be suspended in water according to the present invention

(a) Concentrated and pulverized slurry composition of solid agricultural chemical ingredients
0.1 parts by weight Sopropore BSU (surfactant, Rhodia), 2.0 parts by weight Epan U108 (surfactant, Daiichi Kogyo Seiyaku) and 0.1 parts by weight Rhodosil 454 (defoamer, Rhodia, silicone) and 0.1 parts by weight Rhodopore 23 (thickener, Rhodia, xanthan gum) is mixed by dissolving or dispersing in water, followed by the addition of solid agrochemical ingredients. Either Bensulfuron-methyl (generic name) alone or a combination of bensulfuron-methyl and pyriftalide (generic name) is used as the solid agrochemical ingredient. The concentration of each active ingredient in the slurry is adjusted to 15% (176 g / liter) for bensulfuron-methyl and 30% (352 g / liter) for pyriftalide. The concentrated slurry is prepared by wet milling at 1000 rpm / hr in a batch type bead mill (Imex, 4 barrel sand mill, 1/8 gallon, 1 mm glass beads) (concentration 10 times the composition) ).

(b) Emulsified composition of liquid pesticide ingredients Emulsifier (Epan U108, Epan U103, Epan U105 or NK-PTC), propylene glycol (antifreeze, Showa Denko), KH ₂ PO ₄ (pH adjuster, Nippon Kayaku), Xanthan gum (thickener, Rhodia) and Proxel GXL (1,3-benzisothiazolin-3-one, antifungal agent, Arch Chemicals) are mixed in water. See Tables 1 and 2 for the amount of each additive component. The oil phase in which the oil is dissolved while being forcibly stirred with a homogenizer is added to the liquid agrochemical component to emulsify the oil phase in the aqueous phase. Pretilachlor (generic name) is used for liquid pesticide ingredients. In addition, soybean oil (Honen Corporation) or liquid paraffin (Matsuken, Moresco White P-70) is used in the oil. See Tables 1 and 2 for the amount of each additive component. The emulsion is forcibly emulsified for about 2 minutes to obtain the desired particle size.

(c) Manufacture of agrochemical compositions that can be suspended in water Add a solid agrochemical slurry to a liquid agrochemical emulsion (emulsion to slurry = 9: 1 ratio), and continue to have a propeller-type stirring blade on the handle for 5 minutes. Mix with the attached laboratory mixer to obtain the composition.

Stability test Each pesticidal composition suspendable in water prepared in the above method is subjected to a storage stability test to follow the degradation of the pesticidal components in the composition, namely pyriftalide, pretilachlor and bensulfuron-methyl.

  100 ml of the agrochemical composition prepared according to the method of composition above is sealed in a glass container and left at 54 ° C. in a thermostatic bath. Two weeks later, the agrochemical composition is taken out of the thermostatic bath, and subsequently the content of the agrochemical component is measured by high performance liquid chromatography. The results are shown in Table 4.

Table 4: Storage stability test performed on the agricultural chemical composition according to the present invention

  The pesticide composition that can be suspended in water according to the present invention, which includes a liquid pesticide component and a solid pesticide component, ensures sufficient suspension or dispersion of the contained components, suppresses their decomposition, and further stores for a long period of time. Even in this case, they suppress their precipitation and aggregation. The storage stability of improved formulations containing soybean oil and glycerol (Formulations 2 and 3) is very similar to the storage stability of formulations containing liquid paraffin and propylene glycol.

^*0＝損傷なし、
^*1＝実質的な損傷はないが、いくつかの兆候がある、
^*2＝わずかな損傷、及び
^*3＝受け入れられない損傷。
DAAとは、適用後の日数(days after application)を意味する。 Table 5: Phototoxicity tests performed with the improved formulations according to the invention

^* 0 = no damage,
^* 1 = There is no substantial damage, but there are some signs,
^* 2 = slight damage, and
^* 3 = Unacceptable damage.
DAA means days after application.

  Improved formulations 2 and 3 according to the invention comprising glycerol and soybean oil at test concentrations are much safer than formulations containing propylene glycol and liquid paraffin (formulation 1) and also contain 14,95% glycerol Formulation 2 is safer than Formulation 3 with only 4,48% glycerol.

Claims (7)

A water-suspendable pesticidal composition comprising pretilachlor , at least one solid pesticidal component, at least one oil and at least one polyol containing at least three hydroxyl groups , wherein the vegetable oil is soybean oil And the polyol is glycerol or polyvinyl alcohol . The composition of claim 1, wherein the at least one solid agrochemical component is a sulfonylurea based herbicide or pyriftalide. The composition according to claim 2 , wherein the sulfonylurea based herbicide is bensulfuron-methyl. Comprising at least one non-ionic surfactant The composition of claim 1. The composition according to claim 4 , wherein the nonionic surfactant is a polyoxyethylene-polyoxypropylene block polymer. A method for controlling undesired plant growth in useful plant crops, enabling an effective amount of the composition of claim 1 to act where control is desired. Comprising a method. 7. The method of claim 6, wherein the crop of useful plants is rice and the undesired plants are grass and weeds.