JP2764155B2 - Paddy field preparation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is to provide a throw-in preparation which is easy to apply a medicine in controlling pests of paddy rice, and to provide a simple method of treating the medicine thereby.

[0002]

2. Description of the Related Art In recent years, paddy fields have been rapidly increased in size and mechanized in order to reduce the cost of rice cultivation. In response to this, various labor-saving formulations and sprayers have also been developed for spraying pesticides, and significant technological innovation has been made in the direction of labor saving. However, in practice, the application of various pesticides for paddy fields including insecticides is still carried out using dusting agents, granules, emulsions, wettable powders, flowables, etc., and in many cases paddy fields. , And often carry a heavy spraying machine or the like. For this reason, although the time required for spraying pesticides is shorter than before, it is a serious task for elderly farmers who have been increasing in recent years, and further development of labor-saving formulations and application methods is expected. It is rare.

[0003] In the case of insecticides, a method of spraying an emulsion or a flowable agent in the air using a helicopter, a radio-controlled helicopter, or the like has been practiced. However, there is a problem of environmental pollution due to drift, an effect on painting of automobiles, and an increase in spraying cost. There is a problem and it is thought that there is a limit to the spread. Proposal of a water surface application oil agent that is certainly advantageous when applying insecticides with silkworm venom because it can be applied alone and there is no drift instead of dusts, emulsions, granules, etc. using large spraying equipment was there. In this method, the surface of the water is expanded by the force of the surfactant added after application to the surface of the paddy field. It is quite difficult to spread the surface and exhibit a stable insecticidal effect, and there is a problem in practicality. Also, very recently, a labor-saving insecticide method in which granules of an insecticide are packed into a package made of a water-soluble film and about 10 pieces per 10a are thrown into a paddy field has been tested. The weight is not reduced because it is stuffed in a water-resistant film, and because the bag is bulky, it is caught by the rice body at the time of putting it into the paddy field and does not reach the surface of the paddy field, it does not show the effect, and the paddy rice is often damaged Therefore, problems such as undesirable growth are pointed out.

Japanese Patent Application Laid-Open No. 4-134002 discloses that
Dissolve or disperse the pesticide active ingredient in oily solvent or dispersion medium,
There is a proposal of a throw-in formulation for pesticides directly applied to the water surface, in which an oil-based formulation containing a surfactant as an emulsifier, dispersant or spreading agent is encapsulated in a gelatin film capsule, but when an oil-based formulation is encapsulated in a gelatin capsule. Due to the technical problem described above, there is a disadvantage that the amount that can be enclosed is limited and the number of throws is increased.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and to provide a formulation suitable for controlling paddy field pests by a simple method without using a special chemical sprayer. is there.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a water-based agricultural oil solution obtained by dissolving a poorly water-soluble or water-insoluble pesticidal active ingredient in a water-insoluble high-boiling solvent having a specific gravity of 1 or less. A throw-in preparation for paddy field characterized by being enclosed in a container, wherein the throw-in preparation for paddy field is 1 to 100 per 10a, and the total weight of the throw-in preparation is 50 to 30.
Throw it into the flooded paddy field and apply
This is a method for killing insect pests of paddy rice, characterized in that a water-soluble container is dissolved in water and the oil agent contained therein is spread on a rice field.

The term "water-soluble container" used herein refers to a bag made of a water-soluble film such as polyvinyl alcohol, water-soluble cellulose or gelatin, or a molded product obtained by molding the above water-soluble material. . The shape of the water-soluble container may be any shape because the shape does not greatly affect the medicinal effect, but in the case of a water-soluble film bag, a square or rectangular bag is used. The above-mentioned water-surface-expanding cushion-shaped or futon-like one containing the water surface-expanding agent, in the case of molded articles, box-like, cylindrical, spherical, conical regular tetrahedral, bottle-like, elliptical spherical, rod-like, etc. Basically, the present invention is not limited to these as long as it can basically contain a liquid water-applied oil agent. The thickness of these containers is a main factor that determines the time until the contained oil for surface application flows out, and differs depending on the manufacturing method in the case of a bag and a case of a molded product, In the case of a container on a bag, it is preferably about 0.01 to 1.0 mm, and in the case of a molded article, it is preferably about 0.1 to 3.0 mm. If it is too thin outside this range, the time until the outflow of the content liquid will be short, but there will be a problem with the strength of the container. It takes an extremely long time, which is not preferable. Normal water temperature in paddy fields (10-30 ° C) in the above thickness range
In 3 hours, a part of the container is dissolved within 3 hours and the content liquid flows out.

When the throwing agent according to the present invention is applied to a flooded paddy field, it floats on the surface of the water and dissolves in the water-soluble container upon contact with water. Spread to the rice field. Insecticidal component in the present invention is a paddy field pest which is a target planthopper, rice water weevil,
The dwarf beetle usually inhabits the rice body and sucks water, but the above-mentioned insecticide in the form of a film that adheres to the stalk part or spreads on the water surface when entering the water through the stalk occasionally to replenish water Contact with components leads to death. Therefore, the pesticidal component in the present invention needs to be present on the water surface, and the oil agent for water application contained therein is insoluble in water and has a specific gravity of 1 or less because it is spread on the water surface. There is. Furthermore, in order to effectively spread the insecticidal active ingredient in water, rather than directly applying the oil for water application to the surface of the paddy field, it is enclosed in a water-soluble container made of a light material as in the present invention, and further buoyant. The method of the present invention is more preferable in that the container can be devised such that bubbles are partially coexistent, instead of completely filling the inside of the container with the oil agent.

The throwing agent according to the present invention is obtained by dissolving a water-insoluble or water-insoluble insecticidal active ingredient in a water-insoluble high-boiling solvent having a specific gravity of less than 1 and adding a surfactant. Consists of The non-water-soluble high-boiling solvent having a specific gravity of less than 1 in the present invention is dinormal octyl phthalate, diisooctyl phthalate, diisononyl phthalate, diisodecyl phthalate, normal butyl laurate, adipic acid having a boiling point of 200 ° C. or more. Examples thereof include di-2-ethylhexyl, di-2-ethylhexyl maleate, di-2-ethylhexyl sebacate, phenylxylylethane, and liquid paraffin. Among these, particularly preferred are di-n-octyl phthalate, di-normal nonyl phthalate, di-isononyl phthalate, di-normal decyl phthalate, di-isodecyl phthalate, di-normal di-undecyl phthalate, di-normal dodecyl phthalate, di-normal di-phthalate Examples include alkyl phthalates having an alkyl group having 8 to 13 carbon atoms, such as tridecyl. These solvents can be used alone or in a combination of two or more. Of course, the solvent is not limited to these as long as they satisfy the above conditions.

[0010] The surfactant used in the present invention is one that is obtained by dissolving a sparingly soluble or water-insoluble pesticidal active ingredient in a non-polar high-boiling solvent to give spreadability on the water surface. Salt type, higher alcohol sulfate type, liquid fatty oil sulfate type, aliphatic amine and aliphatic amide sulfate type, aliphatic alcohol phosphate type, dibasic fatty acid sulfonate type,
Anionic surfactants such as fatty acid amide sulfonates, formalin-condensed naphthalene sulfonates, polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, polyoxyethylene alkyl esters, sorbitan alkyl esters And non-ionic surfactants such as polyoxyethylene sorbitan alkyl ester. These surfactants may be used as one kind or a mixture of two or more kinds of the respective surfactants, or may be used as a mixture of an anionic surfactant and a nonionic surfactant.

The poorly soluble or water-insoluble pesticidally active ingredient referred to herein is 2- (ethoxyphenyl) -2-methylpropyl 3-phenoxybenzyl ether, dimethyl
(4-ethoxyphenyl) [(4-fluoro-3-phenoxy) phenylpropyl] silane, 1- (4-fluoro-3-phenoxyphenyl) -4- (4-chlorofel) -4-cyclopropylbutane, ( RS) -α-cyano-3-phenoxybenzyl (RS) -2, 2-dichloro-1- (4-ethoxyphenyl) cyclopropanecarboxylate, 3-phenoxybenzyl = (1RS, 3
RS)-(1RS, 3RS) -3- (2,2-dichlorovinyl) -2,2-dimethylcyclopropanecarboxylate, (RS) -α-cyano-3-phenoxybenzyl = (1RS, 3RS)-( 1RS, 3RS) -3-
(2,2-dichlorovinyl) -2,2-dimethylcyclopropanecarboxylate, (RS) -α-cyano-3
-Phenoxybenzyl = (RS) -2- (4-chlorophenyl) -3-methylbutanoate and the like, but are not limited thereto.

Among them, particularly preferred is 2-
(Ethoxyphenyl) -2-methylpropyl 3-phenoxybenzyl ether, dimethyl (4-ethoxyphenyl) [(4-fluoro-3-phenoxy) phenylpropyl] silane, 1- (4-fluoro-3-phenoxyphenyl)- 4- (4-Chlorofer) -4-cyclopropylbutane, (RS) -α-cyano-3-phenoxybenzyl (RS) -2, 2-dichloro-1- (4-ethoxyphenyl) cyclopropanecarboxylate No.

In the present invention, the concentration of the above pesticidal active ingredient in the oil for water application to be contained in the container depends on the kind of the pesticidally active ingredient used, but is limited by the specific gravity of the whole oil for water application. That is, it is essential that the specific gravity of the entire oil agent is less than 1 in order for the water surface application oil agent to effectively spread, and when an insecticidal active ingredient having a specific gravity of about 1 to 1.1 is used as described above, 30%. The upper limit is about weight%. In addition, the lower limit is about 0.5% by weight due to restrictions such as efficiency in spraying and product cost. As described above, the preferred concentration of the insecticidally active ingredient in the oil applied to the water surface is 0.5 to 30%, more preferably 1 to 2%.
0% by weight. In the present invention, the amount of the surfactant used in the oil applied on the water surface included in the container is usually 0.1 to 20% by weight, preferably 1 to 10% by weight in the oil.

In the present invention, the throwing agent is used in an amount of 1 to 100 per 10a, and the total weight of the throwing agent is 50 to 30.
The application is carried out so as to be 00 g, but if it is largely out of this range, it is not desirable in terms of medicinal effect and phytotoxicity, and further, the workability at the time of spraying is remarkably reduced. A more desirable application method cannot be specified unconditionally due to the difference in the production method of the water-soluble container, the size, the insecticidal component, the non-polar high-boiling solvent, the type of the surfactant, and the mixing ratio.
Divide 00 to 2000 g of oil for water application on the surface into about 20 to 200 g per water-soluble container, and apply 1 to 20 of these. As described above, since the throwing agent of the present invention can be thrown into the paddy field from the ridge without entering the paddy field, the workability at the time of spraying is extremely simple, and compared with the conventional application method mainly using granules, powders and the like. And will be very advantageous.

The throwing agent according to the present invention is suitable for controlling harmful pests inhabiting the water surface, for example, rice weevil, rice horn beetle, brown planthopper, brown planthopper, cedar planthopper, black leafhopper, and bollard.

[0016]

EXAMPLES Next, the present invention will be described in more detail with reference to Examples and Test Examples, but of course, the present invention is not limited to these.

Example 1 94 parts by weight of dinormal octyl phthalate, Neugen E
A-70 [manufactured by Daiichi Kogyo Seiyaku Co., Ltd., content: polyoxyethylene nonylphenyl ether] 2 parts by weight and 2- (
4 parts by weight of (ethoxyphenyl) -2-methylpropyl 3-phenoxybenzyl ether (hereinafter referred to as etofenprox) were mixed to obtain 100% by weight of an oil agent containing 4% of etofenprox. 50 g of this oil agent was applied to a polyvinyl alcohol film [manufactured by Riken Vinyl Co., Ltd.
[Thickness: 0.1 mm] and sealed in a 5 cm × 15 cm large bag (content: 100 ml) to obtain a futon-like throwing agent.

EXAMPLE 2 94 parts by weight of diisodecyl phthalate, Solpol 3851
[Product of Toho Chemical Co., Ltd .: Combination of nonionic surfactant and anionic surfactant] 2 parts by weight and 4 parts by weight of etofenprox were mixed to give 4 parts of etofenprox.
% Of the oil agent was obtained. 50 g of this oil agent was used in a blow molding method using polyvinyl alcohol pellets (product number: PVA # 505, manufactured by Kuraray Co., Ltd., degree of polymerization: 500) and a 5 g weight ampule-type container (body part:
35mmφ × 85mmφ, neck and neck: 12mm × 30mm,
(Thickness of body: 0.4 mm, content: 100 ml) to obtain a throwing agent.

EXAMPLE 3 94 parts by weight of diisononyl phthalate, Solpol 3154
[Product of Toho Chemical Co., Ltd .: Combination of nonionic surfactant and anionic surfactant] 2 parts by weight and 4 parts by weight of etofenprox were mixed to give 4 parts of etofenprox.
% Of the oil agent was obtained. 0 g of this oil agent was used in a blow molding method using polyvinyl alcohol pellets (product number: PVA # 505, degree of polymerization: 500, manufactured by Kuraray Co., Ltd.) and a 5 g ampoule-type container (body part:
35mmφ × 85mmφ, neck and neck: 12mm × 30mm,
(Thickness of body: 0.4 mm, content: 100 ml) to obtain a throwing agent.

Example 4 94 parts by weight of diisononyl phthalate, Solpol 3154
[Product of Toho Chemical Co., Ltd .: Combination of nonionic surfactant and anionic surfactant] 2 parts by weight and 4 parts by weight of etofenprox were mixed to give 4 parts of etofenprox.
100 parts by weight of an oil agent containing parts by weight was obtained. 50 g of this oil
Was bagged with a polyvinyl alcohol film [manufactured by Riken Vinyl Co., Ltd., thickness: 0.1 mm].
A futon-like throwing agent was obtained by enclosing in a bag of 5 cm in size.

Comparative Example 1 88 parts by weight of xylene, 2 parts by weight of a surfactant (a blend of a polyoxyethylene styrylphenyl ether type and an alkylbenzene sulfonic acid type) and 10 parts by weight of etofenprox were mixed, and etofenprox was mixed. 100 parts by weight of an emulsion containing 10% was obtained. 20 g of this emulsion was obtained by blow molding using polyvinyl alcohol pellets (product number: PVA # 505, degree of polymerization: 500, manufactured by Kuraray Co., Ltd.) and a 5 g ampoule-type container (body part: 3).
5mmφ × 85mmφ, neck and neck: 12mm × 30mm,
(Thickness of body: 0.4 mm, content: 100 ml) to obtain a throwing agent.

Test Example 1 Insecticidal activity test on rice water weevil Four weeks after rice transplantation, rice leaves grew to about 5 leaves, and a section of 169 m ² (13 mx 13 m) under 5 cm flooding conditions.
6 paddy fields were prepared. In each of the test plots, one of the throwing agents shown in Examples 1 to 4 and Comparative Example 1 was thrown into almost the center of the section. In one of the remaining two compartments, 133 g of commercially available trebon granules (containing 1.5% of etofenprox) (the above Examples 1-4)
And the amount of the active ingredient in one of the throwing agents described in Comparative Example was the same), and 50 ml of a water-spreading oil having the composition shown in Example 1 was placed on one side, and approximately the center of the test section It took about 30 minutes to perform the dropping treatment.

The test results were obtained by examining the number of adults of the rice weevil before application, and by spraying 1, 3, 5, 7, 10
After a day, the number of the same adults was examined, and the corrected density index was calculated by the following formula, and the results are shown in Table 1 (Table 1). [B] × [C] (1) Corrected density index = ───────── × 100 [A] × [D] A: Number of surviving individuals in untreated plot B: Survival before spraying in untreated plot Number of individuals C: Number of surviving individuals in the treated area D: Number of surviving individuals before application in the treated area

[0024]

[Table 1]

As shown in Table 1, each of the throwing agents shown in Examples 1 to 4 exhibited very good insecticidal activity against rice weevil, as in the case where the water-spreading oil was applied directly by dropping. . In addition, when these water-spreading oils were used, regardless of whether or not they were included in a water-soluble container, better results were obtained when the same amount of commercially available trebon granules was used as the active ingredient. . In addition, a good insecticidal activity could not be obtained with an agent in which an ordinary emulsion was placed in a water-soluble container.

Test Example 2 Extensibility test of each throwing agent Using the field of paddy field of Test Example 1, the throwing agents of Examples 1 to 4 were put into a paddy field, and then the container was dissolved and the water surface of the contents was expanded. Table 2 shows the time required for the spreadable oil to flow out and the distance the oil spread and reached within 24 hours thereafter.

[0027]

[Table 2]

As shown in Table 2, the time required for the contents to flow out depends on the type of water-soluble container in which the oily agent that spreads the water surface of the contents is placed. The distance reached was very good as compared with that obtained by dropping the oil agent.

[0029]

Industrial Applicability The present invention is a throw-in preparation that can be easily applied to paddy fields, and by applying this throw-down preparation to paddy fields, it is possible to efficiently control rice pests.

Continued on the front page (72) Inventor Takeshi Imahita 1144 Togo, Mobara-shi, Chiba Pref. Mitsui Toatsu Kagaku Co., Ltd. (72) Inventor Yoshie Miyama 1144 Togo, Togo, Mobara-shi, Chiba Pref. (72) Inventor Toshio Matsumoto 1144 Togo, Mogo-shi, Chiba Pref., Within Mitsui Toatsu Chemicals Co., Ltd. (72) Inventor Yuji 1144 Togo, Togo, Mobara-shi, Chiba Pref. References JP-A-5-78203 (JP, A) JP-A-5-78207 (JP, A) JP-A-6-9301 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB Name) A01N 25/00-25/34 A01N 31/14

Claims (1)

(57) [Claims] 1. 2- (ethoxyphenyl) -2-methyl
Propyl 3-phenoxybenzyl ether having a specific gravity of 1
A water solution for agricultural use which is obtained by dissolving a smaller water-insoluble alkyl group having 8 to 13 carbon atoms in an alkyl phthalate and adding a surfactant thereto is obtained by molding polyvinyl alcohol by a blow molding method. 0.1 to 3.
A planthopper or a rice plant moss , which is contained in a molded product having a bottle-shaped or ampoule-shaped shape of 0 mm.
A throw-in preparation for paddy field for controlling rice, leaf beetle or leafhopper leafhopper .