JP3340759B2 - Pesticide formulation for water application - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pesticide formulation to be applied to water.

[0002]

2. Description of the Related Art Granules are generally used as a dosage form of an agricultural chemical formulation applied to the water surface of a paddy field. However,
Granules need to be sprayed evenly over the entire paddy field using a sprayer at 3 to 4 kg per 10 ares, which is a heavy labor. At the same time, there is a problem in safety such that the worker comes into contact with the medicine.

On the other hand, as a technique for using a water-repellent substance for formulating a pesticide, there is a method in which a pesticide component is dissolved or dispersed in an emulsified, dispersed or aqueous solution of a wax-like substance, and extruded and granulated together with a water-soluble bulking agent ( Japanese Patent Publication 63-7162
Publication). Recently, as one of labor-saving techniques for spraying pesticides, a method of throwing tablets or capsules containing a herbicidally active ingredient into paddy water (Japanese Patent Laid-Open No. 3-1738).
No. 02) has been proposed.

[0004]

The method of throwing tablets or the like into the paddy water described above is extremely labor-saving as compared with the case where the granules are uniformly treated on the entire surface of the paddy field. However, the tablets or capsules described in the above publications have insufficient diffusibility in water, and cannot always be said to be able to sufficiently exhibit the effects of the active ingredient. Therefore, development of a water-applied pesticide formulation which is labor-saving and has excellent diffusibility into paddy water instead of this is desired. The present invention seeks to provide a pesticide formulation that meets these needs.

[0005]

Means for Solving the Problems The present inventors have intensively studied to solve these problems. As a result, a solid composition obtained by impregnating or adhering a pesticidal active ingredient to a grain nucleus composed of a water-soluble substance and a solid water-repellent substance having a specific gravity of less than 1 or by packaging the composition with a water-soluble polymer film is used. Thus, the above-mentioned problems have been solved, and at the same time, the agricultural chemical formulation of the present invention which is labor-saving and highly safe has been completed.

Next, the pesticide formulation for water application according to the present invention will be specifically described.

As the pesticidal active ingredient of the present invention, any of those usually used in paddy fields can be used, and one kind or two or more kinds may be used in combination. Examples of such pesticidal active ingredients include the following.

(Insecticides) MPP, MEP, pirimiphosmethyl, diazinon, isoxathion, pyridafenthion, chlorpyrifosmethyl, bamidione, marathon, PAP, dimethoate, ethylthiomethone, PM
P, monocrotophos, BRP, CVMP, dimethylvinphos, propaphos, DEP, EPN, NAC, MTM
C, MIPC, BPMC, PHC, MPMC, XMC,
Bendiocarb, carbosulfan, benfracarb, thiodicarb, cycloprothrin, etofenprox, cartap, thiocyclam, bensultap,
Buprofezin, etc.

(Disinfectant) Basic copper sulfate, basic copper chloride,
Cupric hydroxide, organosulfur nickel salt, thiuram, captan, TPN, fusalide, IBP, EDDP, thiophanatemethyl, benomyl, iprodione, mepronil, flutranil, tefurophthalam, pencyclon, metalaxyl, triflumizole, blasticidin S,
Kasugamycin, polyoxin, validamycin A, oxytetracycline, hydroxyisoxazole, metasulfocarb, MAF, MAFE, benthiazole,
Phenazine oxide, diclomedine, probenazole,
Isoprothiolane, tricyclazole, pyroquilon, oxonic acid, guazatine, and the like.

(Herbicide) 2,4-D, MCP, MCP
B, Phenothiol, Clomeprop, Naproanilide, CNP, Clomethoxynil, Bifenox, MC
C, Benthiocarb, Esprocarb, Molinate, Dimepiperate, DCPA, Butachlor, Pretilachlor, Bromobutide, Mefenacet, Dimelone, Bensulfuron-methyl, Simethrin, Promethrin, Dimethamethrin, Bentazone, Oxadiazon, Pyrazolate, Pyrazoxifene, Benzofenap, Triflularin, Apilofoline Such.

(Plant regulators) Inabenfide, oxyethylene docosanol, nicotinamide, benzylaminopurine, and the like.

The amount of these pesticidally active ingredients to be added to the preparation is not particularly limited, but is generally from 0.5 to 90% (% by weight) of the total amount of the preparation. Depending on the type, it may be added so that the required spray amount per 10 ares is obtained.

[0013] The names of these pesticidal active ingredients are the common names described in the "Agrochemical Handbook" (1989 edition, published by the Japan Plant Protection Association).

The solid water-repellent substance used in the present invention is not particularly limited as long as it has a specific gravity of less than 1. For example, the following are mentioned.

Paraffin wax, palmitic acid, stearic acid, lauric acid, tallow, stearyl alcohol,
Polyethylene and the like.

These solid water-repellent substances can be used alone or as a mixture.

The effect of the solid water-repellent substance is exhibited if the solid composition contains 0.1% by weight or more in the solid composition.
Desirably, it is 0.5 to 20% by weight.

The water-soluble substance used in the present invention is not particularly limited as long as it can be immediately dissolved in water, and examples thereof include the following.

Potassium chloride, urea, ammonium sulfate,
Sodium sulfate, ammonium chloride, ammonium bicarbonate, sodium sulfate, sodium bicarbonate, oxalic acid, citric acid, tartaric acid, sodium tartrate, glucose, maltose, sucrose, lactose, dextrin,
Polyvinyl alcohol, polyethylene oxide, polypropylene oxide, sodium polyacrylate, polyethylene glycol, polypropylene glycol, gum arabic, xanthan gum and the like.

The amount of the water-soluble substance to be added can be appropriately changed depending on the content of the pesticidal active ingredient, but the effect is exhibited when the content is 5% by weight or more in the solid composition.

The pesticide preparation for use on the water surface of the present invention comprises, in addition to the above-mentioned composition, a surfactant, a stabilizer for the pesticide active ingredient,
An auxiliary agent such as a physical property improver may be added, and a carrier may be used.

As such surfactants, nonionic surfactants, anionic surfactants, cationic surfactants and nonionic and anionic mixtures commonly used in agricultural chemical formulations are used. Surfactants and the like can be used.

As the carrier, clay, quartzite, talc, bentonite, calcium carbonate, pumice, diatomaceous earth, vermiculite, pearlite, white carbon and the like can be used.

The pesticide preparation for water application according to the present invention comprises, or comprises a solid composition obtained by impregnating or adhering a pesticidal active ingredient to a grain nucleus comprising a water-soluble substance and a solid water-repellent substance having a specific gravity of less than 1. It is wrapped with a water-soluble polymer film, but in the latter case, it is put into a paddy field. Desirably, the package is 100 g. Here, the shape of the packaging is not particularly limited, and may be, for example, any of a sphere, a column, a square, a box, and an irregular shape.

As the water-soluble polymer film used in the present invention, any water-soluble polymer film can be used as long as it dissolves quickly when the water-applied agricultural chemical formulation of the present invention is put into the water of a paddy field. Examples include polyvinyl alcohol, carboxymethylcellulose, dextrin, hydroxyethylcellulose, methylcellulose, alginate, gelatin, pectin, pullulan, polyvinylpyrrolidone, polyacrylate, polyethylene oxide, and the like. The thickness of these films may be 30 μm to 2 mm as long as they do not easily break during storage, transportation, or throwing into a paddy field by hand.

When the water-applied pesticide preparation of the present invention thus obtained is not packaged with a water-soluble polymer film, a solid composition such as granules can be uniformly dispersed in a paddy field in the same manner as conventional granules. I just need. When it is packaged with a water-soluble polymer film, it varies depending on the kind of the pesticidal active ingredient, the content in the preparation, and the like.
If it is packaged to a weight of 0 g, it may be thrown into about 5 to 20 paddy fields. Then, the pesticidal active ingredient can be widely diffused in water, and a sufficient control effect can be obtained.

[0027]

The pesticide formulation applied to the surface of water of the present invention, once treated in a paddy field, sinks once, but immediately rises to the surface of the water and spreads quickly on the surface of the water. In the meantime, it has the effect of widely and uniformly diffusing the pesticidal active ingredient into the paddy water.

[0028]

The method of preparing the water-applied agrochemical preparation of the present invention is not particularly limited, but can be prepared, for example, by the following method.

The solid water-repellent substance and the water-soluble carrier are mixed with a hammer mill, granulated with a granulator after water addition, and dried to obtain a grain nucleus.

The granulation method and the shape of the granulated material are not particularly limited, and the granulation method may be extrusion granulation, tumbling granulation, or the like.

As a method for impregnating or attaching the pesticidal active ingredient to the obtained grain nucleus, for example, the following method can be mentioned.

(1) If the pesticidal active ingredient is in liquid form,
As it is or dissolved in a solvent, it is sprayed on the grain nuclei.
If it is solid, it is dissolved in a solvent and sprayed on the grain nuclei.

(2) If the pesticidal active ingredient is in liquid form, it is dissolved as it is or dissolved in a solvent, and if it is solid, it is dissolved in solvent and mixed with a grain nucleus in a V-type mixer.

(3) The pesticidal active ingredient and the binder are mixed together with the grain nuclei in a V-type mixer.

The above-mentioned preparation may be used as it is, but if it is packaged with a water-soluble polymer film, it can be thrown into a paddy field by hand, which is effective for labor saving of spraying.

Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

In the following, "parts" all mean parts by weight.

Example 1 2.0 parts of sodium dodecylbenzenesulfonate, 5.0 parts of calcium ligninsulfonate, 3.2 parts of paraffin wax (melting point 55 ° C.) and potassium chloride
89.8 parts are mixed with a hammer mill, 15 parts of water are added, and after kneading, the mixture is granulated by an extrusion granulator. Then drying,
The grains were sized to obtain grain nuclei of 500 to 1680 μm. To 93.4 parts of the obtained grain nuclei, 2.1 parts of phenothiol and 4.5 parts of simethrin previously heated and melted are sprayed to obtain a granular solid composition. This was packaged with a polyvinyl alcohol film (thickness: 40 μm) to 50 g per piece.

Example 2 5.0 parts of calcium ligninsulfonate, 20 parts of diatomaceous earth, 5.4 parts of stearic acid and urea
Six parts are mixed by a hammer mill, and granulated by a tumbling granulator while water 12 is dropped. Then dry and sieved, 50
Grain nuclei of 0 to 1680 μm were obtained. Grain nucleus obtained 93.
To 4 parts, 2.1 parts of phenothiol and 4.5 parts of simethrin previously heated and melted are sprayed to obtain a granular solid composition. This was packaged with a polyvinyl alcohol film (thickness: 40 μm) to 50 g per piece.

Example 3 0.5 parts of sodium lauryl sulfate, 2 parts of polyvinyl alcohol, 6.4 parts of tallow and 91.1 of citric acid
Parts are mixed by a hammer mill, and granulated by a tumbling granulator while dropping 10 parts of water. Then dry and sieved, 500-1
680 μm grain nuclei were obtained. To 78 parts of the obtained grain nuclei, 20 parts of probenazole and polybutene 2 previously mixed were mixed.
Parts were added and mixed with a V-type mixer to obtain a granular solid composition. This is a polyvinyl alcohol film (thickness 4
(0 .mu.m).

Next, the usefulness of the water-applied agrochemical preparation of the present invention is shown by test examples.

[0042]

[Test example]

Test Example 1 Herbicidal effect and phytotoxicity test A test plot having an area of 100 m ² (10 mx 10 m) was made, and per plot, the seeds of the seeds (50 g), the seeds of firefly (30 g), the seeds of azena (10 g), and the seeds of the oak ( 10 g) were sowed, and two days after shaking, a rice plant at the two leaf stage (variety: Nipponbare) was mechanically transplanted. When these weeds reached the 2-3 leaf stage, one (50 g) sample prepared according to Example 1 was treated in the center (one place) of the test plot.

The granules described in JP-B-63-7162 in the Comparative Section were prepared as follows. That is, a paraffin wax is dispersed in water with polyoxyethylene alkyl ether, and 50%
Emulsion was obtained. In 10 parts of this emulsion,
Disperse 0.7 parts of phenothiol, 1.5 parts of simethrin and 5 parts of sodium ligninsulfonate,
And 87.8 parts of potassium chloride were added, kneaded, extruded and granulated, then dried and sized to 500 to 1680 μm.
Was obtained as a granular solid composition.

A predetermined amount of the composition thus obtained and a commercially available granule was sprayed on the entire surface of a paddy field.

The investigation was conducted 30 days after the treatment with the drug, and the center and four corners (sections A to E as in Test Example 1) in the test section were examined.
Pull the surviving weeds in total 5 m ² from places, to measure its dry weight (g), determine the herbicidal rate of 5 ° average by the following equation (%) conversion to the evaluation value of the herbicidal effect according to the following criteria
Calculated . With regard to the phytotoxicity to rice, the degree of phytotoxicity was intensively investigated according to the following criteria. The results are shown in Tables 3 to 5.

[0046]

(Equation 1)

[0047]

[Table 1]

[0048]

[Table 2]

[0049]

[Table 3]

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-6601 (JP, A) JP-A-55-154902 (JP, A) JP-A-53-99327 (JP, A) (58) Field (Int. Cl. ⁷ , DB name) A01N 25/00

Claims (2)

(57) [Claims] 1. A pesticide formulation for water application, comprising a solid composition in which a pesticidal active ingredient is impregnated or adhered to a grain nucleus comprising a water-soluble substance and a solid water-repellent substance having a specific gravity of less than 1. 2. A solid composition obtained by impregnating or adhering an agrochemical active ingredient to a particle nucleus comprising a water-soluble substance and a solid water-repellent substance having a specific gravity of less than 1 is packaged with a water-soluble polymer film. A pesticide formulation for surface application characterized by the following.