JP3598228B2 - Granular pesticide wettable powder - Google Patents

Description

【００６６】
結果は表１に示す。
【００６７】
試験例４ 再分散性試験
１００ｍｌ容量の有栓シリンダーに、２０℃の３度硬水９９．９ｍｌを入れ、この上からＤＦ剤０．１ｇを投入し、シリンダー底部に到達してから１分後にシリンダーを倒立させ、ＤＦ剤を完全に崩壊、分散させる。２０℃で２時間静置後、倒立させ、沈降物が完全に分散するまでの回数を測定する。
【００６８】
結果は表１に示す。
【００６９】
なお、表中のカスガマイシンは塩酸塩を示す。また表中の「真珠岩」または「シラス」はそれぞれ真珠岩またはシラス由来のものであることを示す。
【００７０】
【表１】

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a particulate pesticidal wettable powder (hereinafter, referred to as “DF agent”) having good disintegration, dispersibility, suspension and redispersibility in water.
[0002]
[Prior art]
Conventionally, high-concentration agricultural chemical formulations which are diluted and sprayed with water include emulsions, flowables, wettable powders and the like. However, those dosage forms have problems. For example, emulsions use a large amount of organic solvents as carriers, and therefore have safety problems such as flammability, odor, toxicity, and irritation.Floable agents have problems such as aggregation and sedimentation of dispersed particles after long-term storage. In addition, since the wettable powder is a fine powder preparation, scattering of the fine powder at the time of production and preparation of the drug solution and complicated measurement of the drug are problems. In order to solve these problems, attempts have been made to granulate a wettable powder by granulation.
[0003]
Examples of the vitreous powder obtained by pulverizing the natural vitreous foam include, for example, a pesticide active ingredient and a strip having an irregular shape obtained by pulverizing the natural vitreous foam. Of pesticides containing a vitreous powder having an average particle diameter of 100 μm or less (Japanese Patent Application Laid-Open No. 8-143403), a pesticide active ingredient, and an irregular shape obtained by pulverizing a natural vitreous foam. Agrochemical granular water-dispersible powder containing glassy powder having an average particle diameter of 5 μm to 100 μm, lauryl sulfate, an anionic surfactant other than lauryl sulfate, a binder, and a solid carrier (JP-A-9-301801) No.).
[0004]
[Problems to be solved by the invention]
However, in these conventional DF agents, (1) particles are not easily disintegrated when the DF agent is put into water, (2) dispersibility after disintegration and suspension are not sufficient, (3) Granular pesticide wettable powder containing powder obtained by crushing natural vitreous foam has problems such as poor sedimentation, but poor redispersibility. The reality is that development is desired.
[0005]
[Means for Solving the Problems]
The present inventors have intensively studied to solve these problems. As a result, the DF agent containing a vitreous powder having an average particle diameter of 100 μm or less obtained by crushing the pesticidal active ingredient, bentonite, and natural vitreous foam in the formulation composition was unexpectedly compared with the conventional DF agent. In addition, the inventors have found that disintegration, dispersibility, suspension and redispersibility in water are improved, and the above-mentioned problems can be solved, thus completing the present invention.
[0006]
That is, the present invention provides a granular pesticidal water containing, as an essential component, (1) a pesticidal active ingredient (2) bentonite and (3) a vitreous powder having an average particle diameter of 100 μm or less obtained by pulverizing a natural vitreous foam. About Japanese medicine.
[0007]
In the present invention, the individual particles are irregular by pulverizing the natural vitreous foam into fine particles having an average particle diameter of 100 μm or less, preferably 5 μm to 80 μm, more preferably 10 to 30 μm. It is possible to obtain a pesticidal preparation having good disintegration and dispersibility by keeping the density of the particles at the time of granulation low by forming small pieces.
[0008]
If an unground product of natural vitreous foam is used, particles float on the water surface, and dispersibility and suspension properties deteriorate.
[0009]
Therefore, in the present invention, it is important that the natural vitreous foam is pulverized into a powder having an average particle diameter of 100 μm or less, preferably 5 μm to 80 μm, more preferably 10 μm to 30 μm.
[0010]
Further, conventionally, when bentonite was used, the particles became hard and the disintegration property was remarkably poor. However, by using together with a vitreous powder having an average particle diameter of 100 μm or less obtained by pulverizing a natural vitreous foam, the deterioration and dispersibility of the disintegration are unexpectedly improved. It is possible to obtain an agrochemical preparation which sediments with time but has good redispersibility.
[0011]
Further, the particle diameter of the DF agent of the present invention is preferably 0.1 mm to 1.0 mm from the viewpoint of physical properties.
[0012]
The pesticidal active ingredient used in the DF agent of the present invention may be an insecticide, a bactericide, a herbicide, a plant growth regulator and the like which are generally used as pesticides. One or more of these may be used in combination. Examples of such a pesticidal active ingredient include the following, but the pesticidal active ingredient applicable in the present invention is not limited to these examples.
[0013]
Examples of insecticides MEP, marathon, DDVP, acephate, DEP, NAC, cartap, tetradiphone and the like.
[0014]
Examples of fungicides Basic copper chloride, basic copper sulfate, inorganic copper such as cupric hydroxide, organic copper such as copper 8-hydroxyquinoline, fusalide, metalaxyl, pefurazoate, kasugamycin, validamycin, oxolinic acid, imibenconazole , Ipconazole and the like.
[0015]
Examples of herbicides MCPA thioethyl, bifenox, butachlor, Daimlon, CAT, simethrin, bentazone, butamiphos, DBN and the like.
[0016]
Examples of plant growth regulators: ethephon, indoleacetic acid, ethiclozet, cloxiphonac, dichlorprop, 1-naphthylacetamide, 4-CPA, benzylaminopurine, forchlorfenuron, choline, gibberellin and the like.
[0017]
The amount of these pesticidally active ingredients added to the preparation is not particularly limited, but is generally 0.01 to 90% by weight, preferably 0.1 to 60% by weight of the total preparation. .
[0018]
In addition, these pesticide active ingredient names are common names and the like described in "Agrochemical Handbook 1994 Edition" (published by the Japan Plant Protection Association).
[0019]
The powder obtained by pulverizing the natural vitreous foam of the present invention is derived from natural vitreous materials such as obsidian, perlite and pine stone and from shirasu, but more preferably from pearlite and shirasu. The powder obtained by pulverizing these vitreous foams is obtained by heating a natural vitreous substance by an ordinary method and foaming it with a fired pearlite and shirasu balloon or a commercially available product, using an ordinary pulverizer to have an average particle diameter of 100 μm or less. It is crushed into. When the particle diameter of the powder obtained by pulverizing the vitreous foam has a particle diameter exceeding 100 μm, the hardness of the particles after granulation is weakened, the powder is easily pulverized, and the disintegration and dispersibility in water are poor. There are problems such as becoming. When the average particle diameter is less than 5 μm, it is related to the granulation means, but generally, the hardness of the granulated particles is increased, and the disintegration in water is deteriorated. Therefore, the average particle size should be 5 μm or more and 100 μm or less, preferably 5 to 80 μm, more preferably 10 to 30 μm.
[0020]
The powder obtained by pulverizing such a natural vitreous foam has no problem even if it is used alone or in combination of two or more, and 2% by weight or more, preferably 5 to 80% by weight, is added to the preparation. Good to do.
[0021]
The bentonite of the present invention is other than the organic bentonite, and may be sodium bentonite (main component is sodium montmorillonite) or calcium bentonite (calcium montmorillonite) whose main component is montmorillonite. Such bentonite may be used alone or in combination of two or more, but if the amount added is less than 0.1% by weight in the preparation, the suspension and redispersibility of the DF agent upon dilution with water are reduced. If the addition amount is more than 15% by weight in the preparation, the disintegration and dispersibility of the DF agent upon dilution with water deteriorate, so that 0.1 to 15% by weight, preferably 0.1 to 15% by weight in the preparation. It is preferable to add 3 to 10% by weight.
[0022]
Further, organic bentonite is not preferred because it deteriorates the disintegration and dispersibility of the DF agent upon dilution with water.
[0023]
In the present invention, if necessary, commonly used surfactants, binders, preservatives and fungicides, stabilizers for pesticide active ingredients, and extenders such as inorganic carriers and organic carriers can be used.
[0024]
Surfactants that can be used include nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, and the like.
[0025]
Examples of the nonionic surfactant include polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkylate, and polyoxyethylene phenyl ether. Polymer, polyoxyethylene alkylene aryl phenyl ether, polyoxyethylene alkylene glycol, polyoxyethylene, polyoxypropylene block polymer, fluorosurfactant (perfluoroalkylcarboxylic acid, etc.), silicone surfactant (polyoxyalkylenedimethyl Polysiloxane copolymers), acetylene glycol-based surfactants (2,4,7,9, -tetramethyl-decyne-4,7-diol, etc.) And the like, but is not limited only to these examples.
[0026]
Examples of anionic surfactants include lignin sulfonate, alkyl aryl sulfonate, dialkyl sulfosuccinate, polyoxyethylene alkyl aryl ether sulfate, alkyl naphthalene sulfonate, polyoxyethylene styryl phenyl ether sulfate, alkylbenzene sulfone There are acid salts, alkyl sulfates, and the like, but are not limited to these examples.
[0027]
Examples of the cationic surfactant and the amphoteric surfactant include an alkylamine salt, a quaternary ammonium salt, an alkyl betaine, and an amine oxide, but are not limited to these examples.
[0028]
The addition amount is preferably 0.1 to 30% by weight in the preparation, more preferably 0.3 to 20% by weight in the preparation, from the viewpoint of effect and economy.
[0029]
In the present invention, when the hardness of the preparation is desired, a binder is used. The binder may be any of those commonly used, such as cellulose, methylcellulose, ethylcellulose, carboxymethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, starch, carboxymethylstarch, pullulan, and sodium alginate. , Carbohydrates such as ammonium alginate, dextran, mannan, pectin, tragacanth gum, mannitol, sorbitol, propylene glycol alginate, guar gum, locust bean gum, gum arabic or xanthan gum, and proteins such as gelatin and casein Synthetic substances include polyvinyl alcohol, polyethylene oxide, and polyethylene glycol. , Ethylene-propylene block polymer, sodium polyacrylate, polyvinyl pyrrolidone, and the like.
[0030]
The kind and use amount of the binder should be determined in consideration of the desired disintegration of the preparation of the present invention, but the use amount is 0.1 to 40% by weight in the preparation from the viewpoint of effect and economy. desirable.
[0031]
Examples of preservatives and fungicides that can be used include sorbic acid, potassium sorbate, parachloro-metaxylenol, butyl paraoxybenzoate, and the like. As stabilizers for pesticidal active ingredients, antioxidants, ultraviolet inhibitors, crystal precipitation An inhibitor or the like may be added as necessary. Examples of inorganic carriers that can be used in the present invention include clay, talc, calcium carbonate, sodium carbonate, siegrite, sericite, acid clay, quartzite, diatomaceous earth, pumice, zeolite, vermiculite, white carbon, and the like. Examples of organic carriers include monosaccharides, disaccharides, oligosaccharides such as saw iron, straw, pulp, firgrass, starch, dextrin, glucose, fructose, maltose, sucrose, lactose, and the like.
[0032]
【Example】
The pesticidal granular wettable powder of the present invention can be easily prepared by the method described below. A powder mixture consisting of an agrochemical active ingredient, bentonite, and a vitreous powder having an average particle diameter of 5 to 100 μm obtained by pulverizing vitreous foam, if necessary, may be used as a surfactant, a binder, an inorganic or organic carrier. The mixture is mixed with an antiseptic / antifungal agent, a pesticide active ingredient stabilizer, etc., kneaded with water, granulated using an extrusion granulator, dried and sized. In general, it is preferable to appropriately adjust the particle diameter in the range of 0.1 to 10 mm in consideration of convenience of handling and disintegration of the preparation. Alternatively, the mixture may be granulated with a tumbling granulator while being added to the powder mixture, dried and sized. Further, the powder mixture may be dispersed in water and produced by a spray-drying granulator, or the fluid mixture may be produced by spraying an aqueous binder solution and granulating while flowing the powder mixture. There is no problem at all.
[0033]
Next, the present invention will be described more specifically with reference to Examples and Comparative Examples (Nos. Shown in each Example and Comparative Example correspond to Nos. In the table).
[0034]
The average particle diameter is measured by a Coulter Counter (Coulter Electronics Inc.) particle size distribution analyzer, and is determined as the particle diameter in volume of the particles. Further, “parts” means “parts by weight”.
[0035]
Example 1
1.2 parts of kasugamycin hydrochloride, 15.0 parts of fusalide, 3.0 parts of sodium bentonite (trade name of "Kunigel VA" of Kunimine Industries Co., Ltd.), obtained by crushing natural vitreous foam derived from perlite 15.0 parts of the obtained powder (trade name “RocaHelp 439” manufactured by Mitsui Kinzoku Mining Co., Ltd., average particle diameter 10 μm), 10.0 parts of sodium ligninsulfonate, 1.0 part of polyoxyethylene alkyl ether, and dextrin 3. After mixing 0 parts and 51.8 parts of clay with a hammer mill (manufactured by Fuji Paudal Co., Ltd.), 100 parts of this mixture is added with 7 parts of water and kneaded with a double arm kneader (manufactured by Fuji Paudal Co., Ltd.). Mix. Next, the mixture was granulated by an extrusion granulator (manufactured by Nippon Pharmaceutical Co., Ltd.) equipped with a 0.6 mm diameter screen, further dried by a fluid bed dryer (manufactured by Fuji Paudal Co., Ltd.), and then sieved. A DF agent having a diameter of 0.25 to 1.0 mm was obtained.
[0036]
Examples 2 to 4
The powder obtained by pulverizing the bentonite and the natural vitreous foam of Example 1 was replaced with the average particle diameter and amount shown in Table 1, and the mixture was made up to 100 parts using clay to prepare a powder according to Example 1.
[0037]
Example 5
1.2 parts of kasugamycin hydrochloride, 15.0 parts of fusalide, 0.1 part of sodium bentonite (trade name "Kunigel VA" of Kunimine Industries Co., Ltd.), natural glassy foam derived from shirasu (manufactured by Ichi Kasei Corporation) 20.0 parts of powder (average particle size: 15 μm) obtained by pulverizing the product name “Winlite MSB-3011”, 10.0 parts of sodium ligninsulfonate, 1.0 part of polyoxyethylene alkyl ether, dextrin After mixing 3.0 parts and 49.7 parts of clay with a hammer mill, 9 parts of water are added to 100 parts of the mixture, and the mixture is kneaded and mixed with a double-arm kneader. Next, the mixture was granulated by an extrusion granulator equipped with a 0.6 mm diameter screen, further dried by a fluidized bed dryer and then sieved to obtain a DF agent having a particle size of 0.25 to 1.0 mm.
[0038]
Example 6
1.2 parts of kasugamycin hydrochloride, 15.0 parts of fusalide, 8.0 parts of calcium bentonite (trade name "Kunibond" of Kunimine Industries Co., Ltd.), natural glassy foam derived from shirasu (a product of Ichi Kasei Corporation) 25.0 parts of powder (average particle size: 21 μm) obtained by pulverizing the name “Winlite MSB-3011”), 10.0 parts of sodium ligninsulfonate, 1.0 part of polyoxyethylene alkyl ether, and dextrin After mixing 0 parts and 36.8 parts of clay with a hammer mill, 12 parts of water is added to 100 parts of the mixture, and the mixture is kneaded and mixed with a double-arm kneader. Next, the mixture was granulated by an extrusion granulator equipped with a 0.6 mm diameter screen, further dried by a fluidized bed dryer and then sieved to obtain a DF agent having a particle size of 0.25 to 1.0 mm.
[0039]
Example 7
30.0 parts of imibenconazole, 0.7 parts of sodium bentonite (trade name "Kunigel VA" manufactured by Kunimine Industries Co., Ltd.), natural glassy foam derived from shirasu (trade name "Winlight" manufactured by Ichi Kasei Corporation) MSB-3011 ") (10 parts), a powder (average particle diameter: 8 µm) obtained by pulverizing, 4.0 parts of sodium alkylnaphthalenesulfonate, 2.0 parts of sodium lauryl sulfate, 0.5 parts of polyoxyethylene alkyl ether , 1.0 part of polyvinyl alcohol and 51.8 parts of clay are mixed by a hammer mill, and 11 parts of water is added to 100 parts of the mixture, and the mixture is kneaded and mixed with a double-arm kneader. Next, the mixture was granulated by an extrusion granulator equipped with a 0.6 mm diameter screen, further dried by a fluidized bed dryer and then sieved to obtain a DF agent having a particle size of 0.25 to 1.0 mm.
[0040]
Examples 8 to 9
The powder obtained by pulverizing the bentonite and the natural vitreous foam of Example 7 was replaced with the average particle diameter and the amount shown in Table 1 and made up to 100 parts using clay, and prepared according to Example 7.
[0041]
Example 10
After mixing 2.1 parts of MCPA thioethyl, 1.0 part of polyoxyethylene styryl phenyl ether and 0.5 part of calcium dodecylbenzenesulfonate, 2.0 parts of white carbon was allowed to absorb oil, and calcium bentonite (available from Kunimine Industries Co., Ltd.) 12.0 parts (trade name "Kunibond"), powder obtained by crushing natural vitreous foam derived from perlite (trade name "RocaHelp B-4" manufactured by Mitsui Kinzoku Mining Co., Ltd., average particle diameter 28 μm) After mixing 50.0 parts, 2.0 parts of sodium lauryl sulfate, 2.0 parts of carboxymethylcellulose and 28.4 parts of clay with a hammer mill, 15 parts of water was added to 100 parts of the mixture, and the mixture was kneaded with a double-arm kneader. Knead and mix. Next, the mixture was granulated by an extrusion granulator equipped with a 0.6 mm diameter screen, further dried by a fluidized bed dryer and then sieved to obtain a DF agent having a particle size of 0.25 to 1.0 mm.
[0042]
Examples 11 to 12
The powder obtained by pulverizing the bentonite and the natural vitreous foam of Example 10 was replaced with the average particle diameter and the amount shown in Table 1 to make 100 parts by using clay, and prepared according to Example 10.
[0043]
Example 13
84.1 parts of basic copper chloride, 2.0 parts of sodium bentonite (trade name “Kunigel VA” manufactured by Kunimine Industries Co., Ltd.), natural glassy foam derived from shirasu (trade name “Win” manufactured by Ichi Kasei Corporation) Light MSB-3011 ”), 5.0 parts of powder (average particle size: 15 μm), 4.0 parts of sodium formalin condensate of β-naphthalenesulfonic acid, 2.0 parts of sodium lauryl sulfate, and methyl cellulose 1. After mixing 0 parts and 1.9 parts of lactose with a hammer mill, 5 parts of water is added to 100 parts of the mixture, and the mixture is kneaded and mixed with a double-arm kneader. Next, the mixture was granulated by an extrusion granulator equipped with a 0.6 mm diameter screen, further dried by a fluidized bed dryer and then sieved to obtain a DF agent having a particle size of 0.25 to 1.0 mm.
[0044]
Comparative Example 1
3.0 parts of sodium bentonite of Example 1 and 15.0 parts of a powder obtained by pulverizing a natural vitreous foam were entirely replaced with clay to prepare a powder according to Example 1.
[0045]
Comparative Example 2
A powder was prepared according to Example 2, except that 30.0 parts of the powder obtained by pulverizing the natural vitreous foam of Example 2 was entirely replaced with clay.
[0046]
Comparative Example 3
The sodium bentonite of Example 3 was prepared in the same manner as in Example 3, except that 15.0 parts of the sodium bentonite were entirely replaced with clay.
[0047]
Comparative Example 4
The powder was prepared according to Example 6, substituting the average particle diameter (21 μm) of the powder obtained by pulverizing the natural vitreous foam of Example 6 with the particle diameter (110 μm) shown in Table 1.
[0048]
Comparative Example 5
The powder was prepared according to Example 7, except that 10.0 parts of the powder obtained by pulverizing the natural vitreous foam of Example 6 was replaced with clay.
[0049]
Comparative Example 6
The powder was prepared according to Example 8 by substituting the average particle diameter (17 μm) of the powder obtained by pulverizing the natural vitreous foam of Example 8 with the particle diameter (3 μm) shown in Table 1.
[0050]
Comparative Example 7
Prepared according to Example 10 except that 12.0 parts of calcium bentonite of Example 10 were replaced by clay.
[0051]
Comparative Example 8
6.0 parts of bentonite of Example 11 and 65.0 parts of a powder obtained by pulverizing a natural vitreous foam were completely replaced with clay to prepare a powder according to Example 11.
[0052]
Comparative Example 9
It was prepared according to Example 13 except that 2.0 parts of sodium bentonite in Example 13 was replaced with 2.0 parts of organic bentonite (trade name “ESVEN W” manufactured by Nippon Organic Clay Co., Ltd.).
[0053]
Comparative Example 10
The powder was prepared according to Example 13, except that the powder obtained by pulverizing the natural glassy foam derived from Shirasu in Example 13 was replaced with an ungrounded natural glassy foam (average particle diameter 35 μm).
[0054]
【The invention's effect】
When the present invention is implemented, the following effects are obtained.
[0055]
First, when the particulate pesticidal water dispersible powder of the present invention is put into water and stirred, the particles are easily disintegrated, uniformly suspended and dispersed in water, and sufficient suspendability is obtained.
[0056]
Secondly, the granular water-dispersible pesticide of the present invention is poured into water to obtain a uniform suspension, and then left for a while to form a precipitate in the lower layer. It becomes a liquid.
[0057]
Thus, the particulate pesticidal water dispersible powder of the present invention has good disintegration, dispersibility, suspension and redispersibility in water.
[0058]
Test examples will be given to prove these.
[0059]
Test Example 1 In-water dispersibility test In a stoppered cylinder having a capacity of 100 ml, 99.9 ml of 3rd degree hard water at 20 ° C. was put, and 0.1 g of a DF agent was poured from above. At this time, the method of dispersing the particles in water was observed and evaluated in the following three stages.
[0060]
(Evaluation criteria)
A: Dispersion starts immediately after charging, and disperses to the initial particle size of 30% or less before reaching the bottom of the cylinder.
B: Disperse to 30-70% of the original particle size by the time the particles reach the bottom of the cylinder.
C: The particles reach the bottom of the cylinder with a size of 70% or more of the initial particle size.
[0061]
The results are shown in Table 1.
[0062]
Test Example 2 Disintegration test In a stoppered cylinder having a capacity of 100 ml, 99.9 ml of 3 ° C hard water at 20 ° C. was put, and 0.1 g of DF agent was poured from above, and the cylinder was placed 1 minute after reaching the bottom of the cylinder. Invert and measure the number of inversions until all particles collapse.
[0063]
The results are shown in Table 1.
[0064]
Test Example 3 Suspension test In a stoppered cylinder having a capacity of 100 ml, 99.9 ml of 3 ° C. hard water at 20 ° C. was placed, and 0.1 g of DF agent was poured from above. One minute after reaching the cylinder bottom, 1 Shake the cylinder vigorously upside down 30 times per minute and let stand for 15 minutes. Next, a 10 ml hole pipette is placed in the solution, the tip is kept at the center of the solution, 25 ml of the test solution is gently sucked, and the content (g) of the active ingredient (A) is measured. Then, the suspension rate (%) is calculated by the following equation.
[0065]
(Equation 1)

[0066]
The results are shown in Table 1.
[0067]
Test Example 4 Redispersibility test In a stoppered cylinder having a capacity of 100 ml, 99.9 ml of 3 ° C. hard water at 20 ° C. was placed, 0.1 g of DF agent was poured from above, and the cylinder was returned 1 minute after reaching the bottom of the cylinder. To completely disintegrate and disperse the DF agent. After standing at 20 ° C. for 2 hours, the mixture is inverted, and the number of times until the sediment is completely dispersed is measured.
[0068]
The results are shown in Table 1.
[0069]
In addition, kasugamycin in a table | surface shows a hydrochloride. Further, "pearlite" or "Shirasu" in the table indicates that they are derived from perlite or Shirasu, respectively.
[0070]
[Table 1]

Claims (5)

(1) Pesticide active ingredient (2) Bentonite and (3) Vitreous powder having an average particle diameter of 5 μm to 100 μm of irregularly shaped flakes obtained by grinding natural vitreous foam. A particulate pesticide wettable powder characterized by the above-mentioned. The granular water-dispersible pesticide according to claim 1, wherein the vitreous powder obtained by pulverizing the natural vitreous foam has an average particle size of 5 m to 80 m. The granular agricultural chemical wettable powder according to claim 1, wherein the vitreous powder obtained by pulverizing the natural vitreous foam is a powder obtained by pulverizing calcined pearlite or shirasu balloon, and having an average particle diameter of 10 µm to 30 µm. . The granular water-dispersible pesticide according to claim 1, wherein the bentonite is sodium bentonite or calcium bentonite. 6. The particulate agricultural chemical wettable powder according to claim 1, wherein the particle size of the granular agricultural chemical wettable powder is 0.1 mm to 10 mm. 7.