JPH03279306A - Granule of agrecultural chemical containing silaneofan - Google Patents

Abstract

PURPOSE:To obtain the title granule effective controlling insect pests in water such as paddy field comprising dimethyl(4-ethoxyphenyl) {3-(3-phenoxy-4-fluoro) phenylpropyl} silane, a specific alkylbenzene and further a solid carrier. CONSTITUTION:Granules of agricultural chemical comprising (A) dimethyl(4 ethoxyphenyl) {3-(3-phenoxy-4-fluoro)phenylpropyl} silane, (B) a liguid alkylbenzene containing <=25C alkyl group (e.g. butylbenzene, dodecylbenzene or pentadecylbenzene) and further (C) a solid carrier (e.g. potassium chloride, clay or perlite) as active ingredients. The blending ratio is 0.1-15wt.%, preferably 0.5-10wt.% component A and about 0.2-20wt.%, especially about 5-10wt.% component B based on total amount of the granules. In preparation of the granules, further preferably a proper stabilizer is used.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) This invention relates to agrochemical granules for water surface application. Specifically, when pesticide granules are dropped into water such as rice fields, dimethyl (4-ethoxyphenyl) (3-phenoxy-4-fluoro) phenylpropyl) silane (hereinafter referred to as silaneophane), which is an active ingredient of the pesticide, is released. This invention relates to agrochemical granules for water surface application that float on the water surface and spread on the water surface, making it possible to use silaneophane efficiently.

(Prior Art) Floating pesticide granules have been studied as a method for more efficiently utilizing pesticide active ingredients.

For example, ■ Foamed obsidian or pumice.

A method in which the active ingredient is held in a light carrier that floats on water, such as calcined perlite, and if necessary, a water repellent such as a higher fatty acid is treated to make the granules themselves float on water (Japanese Patent Publication No. 1181/1983).
Special Publication No. 47-1240, Special Publication No. 1182-1982, Special Publication No. 8600-1970, Japanese Patent Publication No. 139308-1980,
(Japanese Patent Publication No. 58-65203); ■ A method of retaining the active ingredient in plastic granules with a specific gravity of 1 or less and making the granules themselves float on water (Japanese Patent Publication No. 48-118)
No. 0, Special Publication No. 49-24222, Special Publication No. 45-956
(No. 0, JP-A No. 55-139308); ■A solid precipitated substance is used as the core, and its outer surface is coated with a substance that floats on water, such as a waxy substance, plastic, or inorganic foam, together with an active substance, to make it active in water. A method of separating substances from the nucleus together with a floating carrier and floating them on the water surface
13, Japanese Patent Publication No. 58-26882): Carbonates of alkali metals or alkaline earth metals and solid acids used in some of the materials of 0 granules react in water to produce carbon dioxide gas, and the force A method (Japanese Patent Publication No. 47-27930) has been disclosed in which granules float to the surface and spread active ingredients on the water surface.

However, each method has advantages and disadvantages, and none of them have been put into practical use.

That is, since method (2) makes the granules lighter, the advantage of granules, which is that they can be easily and evenly spread without being affected by wind, is lost.

Method (2) is expensive because the carrier itself is made of plastic, and - since it is a material that is not biodegradable for boat fishing, there are concerns about pollution.

Although method (2) compensates for the drawbacks of (2) and (2) above, it is incorporated into plastics, waxy substances, adsorbent inorganic foams, etc. in which the active ingredient is suspended, and the elution of the active ingredient from these materials is suppressed. Because of this, the active ingredient does not spread sufficiently on the water surface.

In method (2), the granules float to the surface and spread the active ingredients on the water surface, but since a mineral carrier is used as the material, some of the active ingredients remain adsorbed and disintegrate and settle again.
In some cases, the active ingredients cannot be fully utilized. In addition, there is a risk that carbon dioxide gas will gradually be generated due to atmospheric humidity during storage, and since it requires the use of a solid acid, it is difficult to apply it to active ingredients that are chemically unstable on the acidic side. There are drawbacks.

In addition, there is also a method (Japanese Patent Application Laid-open No. 142901/1983) in which the active ingredient is floated together with a film-forming substance retaining air when the water-soluble carrier is dissolved. In the retained state, as in the case described in connection with the method (2), there is a drawback that it is blown by the wind and as a result, it is not possible to apply it uniformly.

In addition, (1) Granules in which the active ingredient is dissolved in an organic solvent and the specific gravity of the solution is supported on a solid carrier (Unexamined Japanese Patent Publication No. 6
3-17802), when it is dispersed in rice fields, the water-soluble carrier dissolves, and the active ingredient floats together with the solvent, increasing its concentration on the water surface. However, this alone has drawbacks, such as the fact that the active ingredient does not spread and becomes oil droplets, making it impossible to fully demonstrate its medicinal efficacy.

(Problems to be Solved by the Invention) Conventional agrochemical granules for water surface application are not satisfactory in terms of effective utilization of agrochemical active ingredients due to the floating and spreading effects of agrochemical active ingredients on the water surface, as well as pollution problems. However, the development of pesticide granules for water surface application that solved these problems remained an issue. In particular, the present invention aims to develop agrochemical granules for water surface application containing silaneophane useful as an insecticide.

(Means for Solving the Problems) Considering the above circumstances, the inventors of the present invention conducted extensive research and examination, and found that conventional pesticide granules applied to the water surface were insufficiently effective in spreading silaneophane to the water surface. However, when producing good granules containing silaneophane and a solid carrier using a liquid alkylbenzene having an alkyl group with a carbon number of 25 or less, especially one with a specific gravity of J or less, the surfacing and spreading of silaneophan on the water surface is reduced. We have discovered that it has unexpectedly excellent effects in this regard.

That is, the present invention provides (1) dimethyl(4-ethoxyphenyl) (3-(
3phenoxy-4-fluoro)phenylpropyl)silane (i) A liquid alkylbenzene having an alkyl group with a tR prime number of 25 or less (ii) A solid carrier. .

The silaneophane used in the present invention is, for example,
It is a known insecticidal compound described as compound (4) in Japanese Patent Publication No. 83-52035, and is a water-insoluble substance. Moreover, this compound can be produced by the method described in the above-mentioned Japanese Patent Publication No. 63-52035.

Silaneophane is 0.1-15% by weight based on this granule,
Preferably it is used in an amount of 0.5 to 10% by weight.

The alkylbenzene used in the present invention is generally a C1-□ alkyl group, where n represents the number of alkyl groups X substituted on the benzene ring, and is preferably an integer of usually 1 to 4. ] It is a compound represented by.

More preferably, X is a C6-2° alkyl group. Further, each of these alkylbenzenes may be used alone, or a mixture thereof may be used.

Commercially available alkylbenzenes can also be used. Specifically, butylbenzene.

dotesylbenzene, pentadecylbenzene, alkene 2
0T (Japan Oil Detergent: mixture of C12 alkyl- to C1, alkyl-, - indicates benzene. The same applies hereinafter), Alkene 56N (same: mixture of C, alkyl- to C4, alkyl-), Alkene 100P (same; Crx Alkyl-
- mixture of C23 alkyl groups).

Hysol F (same as Cs alkyl) is not limited to these as long as it satisfies the conditions.

The amount of alkylbenzene is usually about 0.
2-20% by weight, preferably about 1-15% by weight, more preferably about 5-10% by weight.

Next, the solid carrier used in the granules according to the present invention may be water-soluble, water-dispersible, or water-insoluble.

Specific examples of water-soluble carriers include potassium chloride, sodium chloride, sodium sulfate, ammonium sulfate, ammonium chloride, ammonium nitrate, urea, boron, sugar, and water-soluble polymers.

Examples of water-dispersible carriers include clay, talc, calcium carbonate, diatomaceous earth, white carbon, bentonite, starch, glass powder, etc., and examples of water-insoluble carriers include perlite, vermiculite, pumice, crushed sand, crushed sand, and river sand. and brick pieces. These carriers may be used alone or in combination, and are not limited thereto.

In addition, the water-applicable agricultural chemical granules of the present invention may further include other types of insecticides (cartap hydrochloride, pyrethrin insecticides, organophosphorus insecticides, carbamate insecticides, natural insecticides, etc.), acaricides, acaricides, etc. Nematode, herbicide.

Plant hormones, plant growth regulators, fungicides (e.g. copper fungicides, organochlorine fungicides, organic sulfur fungicides, phenol fungicides, validamycin A, etc.), synergists,
It is also possible to mix and use attractants, repellents, pigments, fertilizers, etc.

Furthermore, in addition to this, a disintegrant [e.g. Nidoxanone G
R-50P (Sanyo Chemical), Tsurupol 5073 (Toho Chemical), 221 Calgen TG-285 (Monomoto Yushi)], wetting agent [e.g. NP-85 (Sanyo Chemical), inorganic powder (Daiichi Kogyo) Pharmaceutical)], stabilizer E Examples: PAP auxiliary agent (
Nippon Chemical Industries), organic acids, inorganic acids], antioxidants [e.g. Nil Ganox 1010 (Ciba Geigy), Sumilizer BHT (Sumira Kagaku Kogyo)], binders [e.g. gums,
Auxiliary agents such as dextrin, carboquine methylcellulose and its salts (eg, Celogen 7A (Daiichi Kogyo Seiyaku)), sodium alginate, starch, polyvinyl alcohol 1, etc. may be blended.

In formulating the granules of the present invention, in view of the property that silaneophane is stable under alkaline conditions, it is preferable to use a solid carrier such as calcium carbonate or other suitable stabilizer.

In producing the granules of the present invention, a preferred method is to prepare grain nuclei in advance, dissolve silaneophane in the alkylbenzene, and coat the core with a liquid material.

As a coating method, a usual coating method such as mixing an alkylbenzene containing silaneo-7an with the grain cores or spraying the grain cores can be used.

Alternatively, when preparing grain cores, silaneophane and alkylbenzene may be mixed together and granulated to form granules.

As a method for preparing grain nuclei, the carrier may be used as it is, or it may be pulverized to a desired size.

In some cases, water-soluble or water-dispersible adjuvants such as those described above may be used to granulate the particles into a desired size to form grain nuclei. The amount of these adjuvants depends on the type of carrier used, but may be any amount necessary to form grain nuclei. Usually, 1 to 10% by weight of the granule is used.

Furthermore, the granules according to the present invention can also be applied to mixed granules containing agricultural active ingredients such as other types of insecticides and fungicides. At this time,
It can be used in cases where only one active ingredient requires the properties of the granules according to the present invention (water floating properties, etc.), or when both active ingredients require the properties of the granules according to the present invention. It goes without saying that it can be done. In this case, the agrochemical active ingredient according to the present invention that does not particularly require water buoyancy may be mixed at the time of preparing the grain core in the production method using the grain core.

When the thus obtained water-floating pesticide granules of the present invention are dropped into water, such as in rice fields, - after sinking into standing trees, the pesticide active ingredients float to the surface together with alkylbenzene and are spread on the water surface, killing harmful organisms. can be effectively controlled. Specifically, for example, Eurydcm
a rugosa), rice black stink bug (Scoti
nophala Iurida), R4ptortus clavatus, Laodelphax 5tiatclll
us), ) Nilaparvata
lugens), leafhopper (Nephot)
ettix cincticeps), white-legged planthopper (Sogattela furcifera), southern green stink bug (Nezara viridula)
Hemiptera pests such as CChilo
5uppressalis), fall armyworm (Leuc
ania 5eparata), for example, the rice black stink bug (Oulema orgzae).
), Echinocnemus sq.
uameus), rice weevil (Lissorho
Coleopteran pests such as Ptrus oryzophilus, such as Culextrita
seniorhynchus), Taban
It is particularly effective in controlling Diptera pests such as P. ustrigonus.

(Example) Hereinafter, the present invention will be explained in further detail by describing Reference Examples, Examples, and Test Examples. Note that all percentages and parts used herein refer to percentages and parts by weight unless otherwise specified.

Example 1 85.5 parts of calcium carbonate, 3 parts of cerogen 7A, and NP
-850.5 parts were mixed, followed by water addition, kneading, granulation, and drying to obtain 89 parts of grain cores.

The granules were impregnated with a solution prepared by dissolving 1 part of Silaneo 7An in 10 parts of Alkene 56N to obtain granules containing 1% Silaneophane.

Example 2 84 parts of Ishikawa Light Pesticide No. 2 was impregnated with a solution prepared by dissolving 1 part of Silaneophane in 15 parts of Alkene 56N to obtain granules containing 1% of Silaneo 7 Anne.

Example 3 Granules containing 1% of silaneophane were obtained by impregnating 98 parts of Lite (manufactured by Kansai Gravel) with a solution prepared by dissolving 1 part of silaneophane in 20Tl15 alkene.

Example 4 87.5 parts of calcium carbonate, 3 parts of cerogen 7A, and NP
-850.5 parts were mixed, followed by water addition, kneading, granulation, and drying to obtain 91 parts of grain cores.

The granules were impregnated with a solution prepared by dissolving 1 part of silaneophane in 8 parts of alkene 56N to obtain granules containing 1% silaneophane.

1 part of Ayasuo Shiraneofan, 3 parts of Celogen 7A, NP-8
After mixing 50.5 parts of silaneophane and 95.5 parts of carbonated calcium, water was added, kneaded, granulated, and dried to obtain 100 parts of granules containing 1% of silaneophane.

Test Example 1 The distribution ratio (floating rate) of Shiraneophane in the surface layer of a paddy field was measured by the following method.

Pour 200ml of distilled water into a separating funnel (300iII2), add exactly 1g of granules, and wait for the specified time (20 hours).
Leave in room a (15-20°C). Thereafter, the funnel cock is gently opened, a certain amount (30-) of the surface layer is left behind, and keronne 1O- is added thereto for extraction, and the amount of silaneophane is determined by gas chromatography.

As a result, when the water surface application pesticide granules of the present invention are applied,
It can be seen that the proportion (floating rate) of silaneophane in the surface layer of the paddy field is high.

Test Example 2 Controlling effect on overwintering adults of rice weevil The control effect on overwintering adults of rice weevil by applying granules containing 1% silaneophane to the water surface was confirmed at the field level.

The test method was to plant paddy rice (variety: !-Doroki Wase) in an experimental field, spray a prescribed amount of the chemical two weeks after transplanting, and 20 days after treatment, evaluate the degree of feeding damage caused by overwintering adults to 100 plants in the experimental area using the following methods. We investigated and determined the degree of feeding damage index. (Number of repetitions: 2) (Feeding damage degree index) 0: No feeding damage 1: 1 to 5 feeding marks of about 5w/
Strain 2: Same 6-10 pieces/share 3: Same 11-1
5 pieces/stock 4: Same 16-20 pieces/share 5: Same 2
1 to 25 pieces/strain 6: 26 pieces/strain/strain As a result, the water surface floating pesticide granules of the present invention are difficult to cause re-sedimentation after shiraneophane floats and spreads on the water surface, so the effect of shiraneophane is effective. It can be seen that the insecticidal effect lasts for a long time and exhibits excellent insecticidal effects.

(Effects of the Invention) The present invention can provide excellent water-floating agricultural chemical granules that can efficiently control harmful insects in water such as rice fields at low cost.

Claims (1)

[Claims] 1) (i) dimethyl (4-ethoxyphenyl) {3-(
3-phenoxy-4-fluoro)phenylpropyl}silane (ii) A liquid alkylbenzene having an alkyl group having 25 or less carbon atoms (iii) A solid carrier. 2) The water-floating agricultural chemical granule according to claim 1, wherein the solid carrier is calcium carbonate.