JP2849534B2 - Pesticide granules for paddy fields - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel floating granule for paddy fields.

[0002]

2. Description of the Related Art Conventionally, granules, powders, emulsions, wettable powders, flowables and the like have been known as agricultural chemical formulations used in paddy fields. Among them, granules are used in many herbicides, some insecticides and fungicides because of their good sprayability. Normally, granules are used in an amount of 3 to 4 kg per 10 ares. However, in recent years, the necessity of labor saving of spraying of agrochemicals has been increasing, and in order to cope with this, the concentration of the active ingredient in the preparation is increased to apply the granules. Reduction of the dose and spraying from the ridge with a power sprayer are being studied. However, in order to spread the granules uniformly from the ridge, it is necessary to increase the particle size and extend the flight distance. If the application rate of the granules is reduced and the particle size is increased, the number of granules per unit area decreases. As a result, it becomes difficult to uniformly diffuse the active ingredient all over the paddy field, which causes a problem that the effect is reduced or causes chemical damage.

[0003]

DISCLOSURE OF THE INVENTION The present invention relates to a conventional one.
An object of the present invention is to provide a granule which can sufficiently exert an effect as a pesticide even when the application rate is reduced to 1 kg per 10 ares instead of the application rate of 3 to 4 kg per 0 ares. In other words, by reducing the application rate, the number of particles applied per unit area is reduced, but the active ingredient does not remain at the dropping point of the particles, the active ingredient is diffused widely in water, and a high effect as a paddy pesticide An object of the present invention is to develop granules having the same.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies in order to solve the above-mentioned problems, and as a result, have found that granules containing a certain concentration or more of dialkyl sulfosuccinate and bentonite, or floating granules in water. The present invention has been found that granules containing a carrier, and further granules containing carboxymethylcellulose, have a high effect despite the fact that the number of granules per unit area is smaller than conventional granules. Was completed.

That is, the present invention relates to a pesticidal active ingredient,
It is a floating granule for a paddy field containing 0.5 parts by weight of dialkyl sulfosuccinate and bentonite having a swelling degree of 4 g / g / 24 hr or more and a particle size of 0.5 to 5 mm.

[0006] The granules of the present invention once settle in water, settle once, float up again when they have swelled and collapsed to some extent while holding the air held inside the granules during granulation, and the granules burst at the water surface, and the agricultural chemical components Expands the surface of the water. It takes 15 to 25 minutes during this time.

It is important that the granules float and spread on the water surface. The floating / spreading granules can diffuse the pesticidally active ingredient more widely than the granules having no floating / spreading properties, and thus are expected to have a sufficient effect.

In order for the particles to float, it is necessary that the particles swell and disintegrate in water, and that the air retained in the particles generate sufficient buoyancy to cause the particles to float. Therefore, the granule carrier needs to be bentonite having an appropriate degree of swelling. In order for the floating particles to spread, the particles need to float to the water surface, that is, a position in contact with the atmosphere. Dialkyl sulfosuccinate is an essential component for the particles ruptured on the water surface to spread on the water surface.

[0009] Bentonite is essential for the granules of the present invention and can be used with a degree of swelling of 4 g / g / 24 hr or more, preferably 5 g / g / 24 hr or more. If the degree of swelling is low, a sufficient amount of air cannot be retained, and the floating of the particles is prevented and the particles do not spread. The compounding amount varies depending on the amounts of the pesticidal active ingredient and the surfactant, but is usually preferably 30 to 90 parts by weight. Examples of brands that can be used include, but are not limited to, Hotaka-brand bentonite, Ishikari-brand bentonite, Tone-brand bentonite, Kunigel VA, SK-Zero-3, 300-SS-B, Iwaki-brand bentonite, Asama-brand bentonite, and the like. Not something.

In the present invention, dialkyl sulfosuccinate, which is another essential component, has been conventionally used in various industries. For example, it has been used as a flushing agent for pigments, a surface improver, an emulsifier for emulsion polymerization, a coloring aid for synthetic resins, a release agent, and the like, and has many uses in agricultural chemical formulations. Improvement of physical properties of powders (Japanese Unexamined Patent Publication No.
No. 1-91333), and it is also used to improve the performance of emulsions and the adhesion of wettable powders. Also in granules, improvement of granulation properties, uniform dispersion of water during water kneading, reduction of granulation pressure, improvement of screen abrasion, efficiency of drying by water reduction effect, promotion of elution of active ingredients, etc. effective. When used for these applications, it is usually less than 1 part by weight. As an example of using alkylsulfosuccinate in an amount of 1 part by weight or more, there is a herbicidal fine granule (JP-A-54-70424) which is 45-150 mesh for foliage application and is considerably finer than granules. Alkyl sulfosuccinate is used in this fine granule to improve the adhesion of the pesticide component to the foliage when the foliage of the plant is treated. However, since this fine granule is intended for controlling field weeds by foliage application, it may be harmful to paddy rice depending on conditions, and therefore cannot be used in paddy fields.

In the present invention, the amount of the dialkyl sulfosuccinate used is very important. If it is added in an amount of 1 part by weight or more, good diffusibility of the active ingredient can be seen, but preferably 3 to 10 parts by weight is used. desirable. This amount exceeds the amount conventionally used for the above-mentioned conventional pesticide granule. Although less than 1 part by weight has been used in conventional granules, a sufficient effect cannot be obtained with this. If the amount is more than 10 parts by weight, the effect is not improved and there is a possibility of causing phytotoxicity. Therefore, the amount should not be exceeded.

The number of carbon atoms in the alkyl group of the dialkyl sulfosuccinate is not particularly limited, but is preferably 6 to 10. Further, it can be used as various monovalent metal salts, and among them, sodium salt is most preferable.

Basically, if there is a certain concentration of dialkyl sulfosuccinate and bentonite, the above-mentioned floating
The spreading phenomenon occurs and a sufficient effect can be expected. However, if there is a carrier floating on the water, the floating is promoted. Further, when carboxymethylcellulose is present, the suspension of the active ingredient after floating and spreading increases, and the effect is stabilized.

The carrier floating in water which can be used in the granules of the present invention includes those obtained by expanding shirasu, obsidian, pearlite (pearlite) and the like into hollow particles, pearlite, shirasu, and the like.
Calcium carbonate, clay or the like treated with a higher fatty acid or a water repellent such as silicone, or those obtained by chemically hydrophobizing white carbon or the like can be used. Specific examples include foamed hollow pearlite, water-repellent pearlite, water-repellent calcium carbonate, water-repellent pearlite, water-repellent clay, water-repellent white carbon, and fly ash. Most suitable for the purpose. These may be used alone or as a mixture, and are not limited thereto.

When a floating carrier is compounded, the larger the amount of the compound, the higher the diffusibility of the active ingredient and the more stable the effect.
If the amount is too large, the concentration of the active ingredient in water may increase, which may cause phytotoxicity. Although the amount varies depending on the type of carrier, the upper limit is determined by the amount of the active ingredient or the surfactant, and the amount of the floating carrier is desirably 10 to 30 parts by weight from the viewpoint of phytotoxicity.

The carboxymethylcellulose that can be used in the granules of the present invention has been used as a warp paste or a finishing agent in the textile industry and as a stabilizer or a thickener in the food industry. In the paper industry, they are used as adhesives, thickeners, dispersants, etc., and in pharmaceutical cosmetics, they are used as suspending agents, ointment bases and the like. In agricultural use, it is used as a wettable powder, seed dressing, granulating agent, etc., but in the present invention, it is used together with a dialkyl sulfosuccinate and a floating carrier as one component of paddy granules, and an active ingredient. It is suitably used to promote the diffusion of water in water. The used amount can be 1 to 10 parts by weight, and preferably 3 to 7 parts by weight.

Further, in the present granule, in addition to dialkyl sulfosuccinate, nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester and polyoxyethylene fatty acid amide, lauryl sulfate, alkylnaphthalene sulfonate Alternatively, an anionic surfactant such as an alkylbenzene sulfonate or a tripolyphosphate may be used. In addition to these, any substance that improves the dispersion of the active ingredient can be used.

As described above, a light carrier floating in water or carboxymethylcellulose can be used in addition to the above dialkyl sulfosuccinate and bentonite. If necessary, non-floating materials such as clay, talc, diatomaceous earth and the like can be used. The carrier can be used together with a liquid carrier such as animal and vegetable oils and mineral oils in some cases.

The herbicidally active ingredients used in the present invention include 2,4-dichlorophenoxyacetic acid (2,4-D),
2- (2-naphthoxy) propionanilide (naproanilide), 2,4,6-trichlorophenyl-4'-
Nitrophenyl ether (CNP), S- (4-chlorobenzyl) N, N-diethylthiocarbamate (benthiocarb), S-ethyl N, N-hexamethylenethiocarbamate (molinate), S-benzyl N-ethyl-N- (1,2-dimethylpropyl) thiocarbamate (esprocarb), S- (α, α-dimethylbenzyl) piperidine-1-carbothioate (dimipeperate), 2-chloro-2 ′, 6′-diethyl-N- ( 2-
(Propoxyethyl) acetanilide (pretilachlor), (RS) -2-bromo-N- (α, α-dimethylbenzyl) -3,3-dimethylbutylamide (bromobutide), 2-benzothiazol-2-yloxy-N-
Methylacetanilide (mefenacet), 1- (α,
α-dimethylbenzyl) -3- (paratolyl urea) (Dimron), 4- (2,4-dichlorobenzoyl)-
1,3-dimethyl-5-pyrazolyl-p-toluenesulfonate (pyrazolate), methyl = α- (4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -O-toluate (bensulfuronmethyl), Ethyl 5- [3- (4,6-dimethoxypyrimidine-2
-Yl) ureidosulfonyl] -1-methylpyrazole-4-carboxylate (pyrazosulfuronethyl)
And the like, but are not limited to these.

The insecticidal active ingredients include O, O-dimethyl-O- [3-methyl-4- (methylthio) phenyl] thiophosphate (MPP) and O, O-diethyl O-
2-isopropyl-6-methylpyrimidin-4-yl
Phosphorothioate (diazinon), 2-secondary butylphenyl-N-methylcarbamate (BP
MC), 2-isopropoxyphenyl-N-methylcarbamate (PHC), (RS) -α-cyano-3-phenoxybenzyl (RS) -2,2-dichloro-1-
(4-ethoxyphenyl) cyclopropanecarboxylate (cycloprotoline), 2- (4-ethoxyphenyl) -2-methylpropyl 3-phenoxybenzyl ether (ethoxyfenprox), and the like, but are not limited thereto. is not.

The bactericidal active ingredients include α, α, α-trifluoro-3′-isopropoxy-O-toluanilide (flutranyl), 4,5,6,7-tetrachlorophthalide (fusalide), O, O -Diisopropyl-S-benzylthiophosphate (IBP), 3-allyloxy-1,2-benzisothiazole-1,1-dioxide (probenazole), diisopropyl-1,3-dithiolan-2-ylidene-malonate (isoprothiolane), 5-methyl-1,2,4-triazolo [3,4-
b] benzothiazole (tricyclazole), 1,2,2
5,6-Tetrahydropyrrolo [3,2,1-ij] quinolin-4-one (pyroquilon) and the like, but are not limited thereto.

The amounts of these pesticidal active ingredients are determined according to the respective activities, and are usually in the range of 1 to 50%, but not limited thereto.

The pesticidal active ingredient which is solid at room temperature is pulverized and then mixed with the carrier or melt-mixed with the carrier.
Alternatively, they may be dissolved in an appropriate solvent and then mixed with the carrier. The drug substance which is liquid at ordinary temperature may be mixed with the carrier as it is or after being diluted with an appropriate solvent.

While the particle size of a general granule is 1 mm or less, the particle size of the granule of the present invention is 0.5 to 0.5 mm in order to be able to be sprayed from the ridge with a power spreader and to secure the flight distance. It can be 5 mm. Actually, it can be used in this range.
２2 mm is preferred, and a combination of dialkyl sulfosuccinate and bentonite exhibits excellent effects with these particle sizes. Further, the number of gram particles is generally 2,000 particles / g or more in the case of conventional granules, but in the case of this preparation, if it is 100 particles / g or more, a sufficient effect is exhibited. , 400 to 500 particles / g are preferred.

The granule of the present invention is generally applied at a rate of 1 kg per 10 ares using a hand-operated granulator or a power sprayer from a ridge.

Next, the present invention will be described in more detail based on the following examples.

[0027]

【Example】

Example 1 28 parts by weight of CNP (2,4,6-trichlorophenyl-4'-nitrophenyl ether) previously dry-ground with a jet-o-miser as a herbicidal active ingredient, dialkyl sulfosuccinate [trade name: Airol CT]
-1, manufactured by Toho Chemical Co., Ltd.] and 5 parts by weight of bentonite [trade name: Hotaka Sealed Bentonite, manufactured by Toyoshun Mining Co., Ltd.]
Was mixed with water and kneaded with water, followed by extrusion granulation to obtain granules. The particle size of this granule was 1.2 mm.

Example 2 As a herbicidal active ingredient, 28 parts by weight of CNP (2,4,6-trichlorophenyl-4'-nitrophenyl ether) previously dry-ground with a jet-o-miser, dialkyl sulfosuccinate [trade name] : Air roll CT
-1 manufactured by Toho Chemical Co., Ltd.] and 3.0 parts of sodium lauryl sulfate [trade name: Emar 10, manufactured by Kao Corporation].
Parts by weight, white carbon [Product name: Carplex #
80, manufactured by Shionogi Pharmaceutical Co., Ltd.], and 5.0 parts by weight of bentonite (trade name: Hotaka Indo Bentonite, manufactured by Toyoshun Mining Co., Ltd.) were melt-mixed with a Raikai machine, and then mixed with water. Extrusion was performed to obtain granules. The particle size of this granule was 1.2 mm.

Example 3 As a herbicidal active ingredient, 28 parts by weight of CNP (2,4,6-trichlorophenyl-4'-nitrophenyl ether) previously dry-ground with a jet-o-miser was used, and polyoxyethylene allyl phenyl ether was used. 6 parts by weight of a phosphate amine salt [trade name: Newcalgen FS-3, manufactured by Takemoto Yushi Co., Ltd.] and 1 part by weight of dioctyl sulfosuccinate [trade name: Newcalgen EX-70, manufactured by Takemoto Yushi Co., Ltd.] And 65 parts by weight of bentonite (trade name: Hotaka-invented bentonite, manufactured by Toyoshun Mining Co., Ltd.). The mixed powder was kneaded with water and granulated by an extrusion granulator to obtain granules. The particle size was 1.0 mm.

Example 4 As a herbicidal active ingredient, 28 parts by weight of CNP (2,4,6-trichlorophenyl-4'-nitrophenyl ether) which had been dry-pulverized with a Jet-O-Miser beforehand, and Daimlon [1- (α, α-dimethylbenzyl) -3-
(Paratolyl urea)], 5 parts by weight of dialkyl sulfosuccinate [trade name: Airroll CT-1, manufactured by Toho Chemical Co., Ltd.], and sodium lauryl sulfate [trade name:
3.0 parts by weight of Emar 10, manufactured by Kao Corporation and 42 parts by weight of bentonite (trade name: Hodaka Indobentonite, manufactured by Toyoshun Mining Co., Ltd.) are mixed by kneading with water, followed by extrusion granulation and granulation. Agent was obtained. The particle size of this granule was 2.0 mm.

Example 5 As a herbicidal active ingredient, 22.4 parts by weight of naproanilide [β- (2-naphthoxy) propionanilide] which had been dry-pulverized with a jet-o-miser in advance, and bromobutide [(RS) -2-bromo-N] were used. -(Α, α-dimethylbenzyl) -3,3-dimethylbutyramide].
5 parts by weight, mefenacet (2-benzothiazole-2
-Yloxy-N-methylacetanilide) in 12.4
Parts by weight, 10 parts by weight of dialkyl sulfosuccinate [trade name: Airroll CT-1, manufactured by Toho Chemical Co., Ltd.] and 42.7 parts by weight of bentonite [trade name: Hotaka Seal Bentonite, manufactured by Toyoshun Mining Co., Ltd.] After mixing and kneading with water, extrusion granulation was performed to obtain granules. The particle size of this granule is 1.5m
m.

Example 6 28 parts by weight of CNP (2,4,6-trichlorophenyl-4'-nitrophenyl ether) previously dry-ground with a Jet-O-Miser as a herbicidal active ingredient, dialkyl sulfosuccinate [trade name] : Air roll CT
5, manufactured by Toho Chemical Co., Ltd.], 5 parts by weight, bentonite [trade name: Hotaka Sealed Bentonite, manufactured by Toyoshun Mining Co., Ltd.], 57 parts by weight, and foamed hollow perlite [trade name: Siricel 42BC, Toa Kasei Was mixed and kneaded with water, followed by extrusion granulation to obtain granules. The particle size of this granule was 1.2 mm.

Example 7 28 parts by weight of CNP (2,4,6-trichlorophenyl-4'-nitrophenyl ether) previously dry-ground with a jet-o-miser as a herbicidal active ingredient, dialkyl sulfosuccinate [trade name] : Air roll CT
-1, Toho Chemical Co., Ltd.], 5 parts by weight, bentonite [trade name: Hotaka Seal Bentonite, manufactured by Toyoshun Mining Co., Ltd.] 52 parts by weight, foamed hollow pearlite [trade name: Siricel 42BC, Toa Kasei 10 parts by weight) and 5 parts by weight of carboxymethylcellulose [trade name: Cellogen 5A, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.], kneaded with water, extruded and granulated to obtain granules. The particle size of this granule is 1.2mm
Met.

Example 8 As a herbicidal active ingredient, mefenacet [2-benzothiazol-2-yloxy-N-methylacetanilide] previously dry-ground with a jet-o-miser was used.
0.5 parts by weight, 4.5 parts by weight of Daimlon [1- (α, α-dimethylbenzyl) -3- (paratolyl urea)],
0.75 parts by weight of bensulfuron methyl [methyl = α- (4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -O-toluate], dialkyl sulfosuccinate [trade name: AIROL CT-1] , Toho Chemical Co., Ltd.] and 5 parts by weight of bentonite [trade name: Hotaka Ink Bentonite, Toyoshun Mining Co., Ltd.]
After mixing 25 parts by weight and kneading with water, extrusion granulation was performed to obtain granules. The particle size of this granule was 1.2 mm.

Example 9 15 parts by weight of pyroquilon [1,2,5,6-tetrahydropyrrolo [3,2,1-ij] quinolin-4-one] as a bactericidal active ingredient, dialkyl sulfosuccinate [trade name: New Calgen EX-70, manufactured by Takemoto Yushi Co., Ltd.]
5 parts by weight of sodium tripolyphosphate [trade name: MTX-
200, manufactured by Mitsui Toatsu Chemicals Co., Ltd.], and 3.0 parts by weight of bentonite (trade name: Hotaka Indo Bentonite, manufactured by Toyoshun Mining Co., Ltd.) are mixed by 77 parts by weight, kneaded with water, and then extruded and granulated. Granules were obtained. The particle size of this granule was 1.2 mm.

Comparative Example 1 Granules were obtained in the same manner as in Example 1 except that the amount of the dialkyl sulfosuccinate was 0.5 part by weight and the amount of the bentonite was 71.5 parts by weight. The particle size of this granule was 1.2 mm.

Comparative Example 2 In Example 1, bentonite [trade name: Hotaka-brand bentonite, degree of swelling 5.0-6.5 g / g / 24 hr, manufactured by Toyoshun Mining Co., Ltd.] was replaced with bentonite [trade name: fine-grained bentonite] And a degree of swelling of 2.0 to 3.5 g / g / 24 hr, manufactured by Toyoshun Mining Co., Ltd.]. The particle size of this granule was 1.2 mm.

Test Example 1 Test of Herbicidal Effect on Nobies A 5m × 10m test plot was made in a paddy field where seeds were sown after substitution, and the water depth was kept at 5cm. 50 g of each of the preparations shown in Examples 1 to 8 and Comparative Examples 1 and 2 was applied to the entire surface of the test plot on the fourth day after sowing of Nobies (10 days in Examples 5, 8, and 9). For comparison, commercially available MO granules (containing 9% of CNP) and Shoron M granules (9% of CNP, 7% of Daimlon)
) And Shinzan granules (containing 7% of naproanilide, 4% of bromobutide, 3% of mefenacet)
50 g was sprayed on the entire surface.

On the 20th day after the introduction, the herbicidal effect on the fly was investigated. The results are shown in Table 1 (Table 1). In the table, the degree of damage to nobies is indicated based on the following criteria as compared with the case of no treatment.

Indication Growth rate (%) expressed in terms of air dry weight vs. non-treated section

[0041]

[Table 1]

As shown in Table 1, all of the granules shown in Examples 1 to 8 showed high herbicidal effect similarly to the conventional granules on the market, but the granules of Comparative Examples 1 and 2 Was quite ineffective. This indicates that the content of dialkyl sulfosuccinate and the degree of swelling of bentonite greatly contribute to the floating of granules and the diffusion of active ingredients, and greatly affect the herbicidal effect.

Test Example 2 Test of Control Effect on Blast Disease Four weeks after rice planting, rice leaves were grown to about 5 leaves, and two paddy fields of 50 m ² (5 m × 10 m) under flooded conditions in one section of flooded conditions. Prepared. Among them, 50 g of the granules shown in Example 9 were uniformly applied to one section. In other sections, 150 g of commercially available Kolatop granules (containing 5% of pyroquilone) was evenly applied. The amount of each active ingredient is 15 g / 10 ares.

1, 3, 5, 10, and 30 days after spraying, the number of lesions was examined, and the control rate was calculated by the following formula and is shown in Table 2 (Table 2).

[0045]

[0046]

[Table 2]

As shown in Table 2, the granules shown in Example 9 exhibited the same good control effect as the comparative granules even when the granule application amount was reduced, and the active ingredients were uniformly dispersed. Indicates that it has spread.

[0048]

The granules according to the present invention contain dialkyl sulfosuccinate and bentonite,
Even if the particle size is increased and the number of applied particles per unit area is reduced in order to increase the active ingredient concentration in the formulation and reduce the application rate of the granules, and further secure the flight distance, the effect is equal to or higher than that of the commercial product Was. With these preparations, the application of granules such as herbicides in paddy fields can be reduced from conventional 3-4 kg / 10a application to 1 kg / 10a.
a) The application rate can be reduced to the application, and the labor saving of granule application is realized.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Sadafumi Eda 1144 Togo, Mobara-shi, Chiba Prefecture Inside Mitsui Toatsu Chemicals Co., Ltd. (72) Inventor Tamotsu Asano 1144 Togo, Togo, Mobara-shi, Chiba Mitsui Toatsu Chemicals Inc. Examiner: Ichiyoshi Karaki (56) Reference: JP-A-4-66509 (JP, A) JP-A-2-167202 (JP, A) JP-A-60-142901 (JP, A) JP-A-63-17802 (JP, A) JP-A-3-44302 (JP, A) JP-A-5-155703 (JP, A) JP-A-5-78204 (JP, A) JP-A-6-157203 (JP, A) JP-A-6-298603 (JP, A) JP-A-6-192004 (JP, A) JP-A-5-310516 (JP, A) Japan Bentonite Industry Association Standard Test Method (April 1977) Japan Bentonite Industry Association, JBAS-104-77. (58)査the field (Int.Cl. ^6, DB name) A01N 25/12 A01N 25/30 CA (STN ) REGISTRY (STN) WPIDS (STN)

Claims (3)

(57) [Claims] 1. A pesticidal active ingredient of 1 to 50%, a dialkyl sulfosuccinate of 1 to 10 parts by weight, and a bentonite having a swelling degree of 4 g / g / 24 hr or more are 30 to 90 weight parts.
A floating granule for a paddy field having a particle size of 0.5 to 5 mm contained in parts by mass . 2. The method according to claim 1, further comprising a carrier which has been subjected to water-repellent treatment or hollow particles floating in water.
The floating granules for paddy fields according to the above. 3. The floating granule for paddy fields according to claim 2, further comprising carboxymethylcellulose.