JPH05105607A - Herbicide composition for paddy field - Google Patents

Abstract

PURPOSE:To obtain a herbicide composition for paddy field giving no phytotoxicity to a paddy-rice plant, having broad weeding spectrum and capable of surely controlling weeds at low doses. CONSTITUTION:The objective herbicide composition for paddy field contains three components of S-(1-methyl-1-phenylethyl)piperidine-1-carbothioate, methyl 2-[[[[[[4,6-dimethoxypiperidin-2- yl]amino]carbonyl]amino]sulfonyl]methyl]benzoate and 2,3-dihydro-3, 3- dimethyl-5-benzofuranylethanesulfonate as active ingredients.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a herbicide composition, more specifically S- (1-methyl-phenylethyl) piperidine-1-carbothioate (hereinafter referred to as "compound [1]". Yes, and methyl 2-
[[[[[4,6-Dimethoxypyrimidin-2-yl] amino] carbonyl] amino] sulfonyl] methyl] benzoate (hereinafter this may be referred to as “compound [2]”) and 2,3-dihydro -3,3-dimethyl-5-benzofuranyl ethane sulfonate (hereinafter, this may be referred to as "compound [3]") as an active ingredient, having a broad herbicidal spectrum,
The present invention relates to a herbicide composition for paddy fields which exhibits a sufficient herbicidal effect at a low dose.

[0002]

2. Description of the Related Art Up to now, many herbicides have been put to practical use for paddy fields, and they have been widely and generally used as a single agent or a mixed agent containing two or more kinds of components. However, although these agents are relatively effective for annual weeds, their effects on perennial weeds are insufficient, and therefore, perennial weeds such as firefly and Urikawa tend to increase in paddy fields in Japan in recent years. There are many types of these perennial weeds, their fertility is strong, and their occurrence is long-term, so it is very difficult to control them, and a single application of herbicide cannot achieve its purpose, and it is usually the same or different. Although the herbicides are repeatedly sprayed to control, the present situation is that the sufficient effect is not obtained.

[0003]

Recently, various herbicides called "one-shot treatment agents" aiming at achieving the purpose of herbicidal treatment with one treatment have been put into practical use one after another. Etc. have insufficient effect on perennial weeds,
Moreover, for the reason that a sufficient effect cannot be obtained unless it is used very early after rice planting, farmers are eagerly waiting for the development of a new herbicide capable of compensating for these drawbacks.

[0004]

Means for Solving the Problems The present inventors have conducted various studies to develop a herbicide for paddy fields that meets the above-mentioned demands of farmers. As a result, three kinds of compounds (compound [1], compound [2] and compound [3]) having different herbicidal mechanism and herbicidal spectrum are combined, preferably in a specific ratio, to control a wide range of weeds in paddy fields. It was found that the herbicides of the present invention can be selectively controlled, and their herbicidal efficacy is synergistically increased as compared with the case where they are used alone, so that they can be applied at a low dose and the weed spectrum is further expanded. The composition was completed.

The compounds used as the active ingredients of the composition of the present invention are known herbicides which are widely used. That is, "Compound [1]" is Japanese Patent Publication No. 56-
It is a thiol carbamate-based herbicide disclosed in Japanese Patent No. 36167, and its herbicidal effect is mainly excellent for Nobie, but is inferior to other weeds.

"Compound [2]" is Japanese Patent Publication No. 62-6705.
It is a sulfonylurea herbicide disclosed in Japanese Patent Publication No. JP-A-2003-187, and although its herbicidal effect is excellent for a wide range of weeds, it has almost no effect on Nobie, which is an important weed in paddy fields. "Compound [3]" is a herbicide disclosed in Japanese Examined Patent Publication No. 55-45523, and its herbicidal effect is excellent against Nobie and Cyperaceae weeds but low against other weeds.

The composition of the present invention exhibits a strong synergistic effect in a wide range of compounding ratios. The mixing ratio of the three preferable active ingredients (compound [1], compound [2], compound [3]) is
"Compound [1]" is 0.002 to 1 part by weight, and "Compound [3]" is 0.02 to 1 part by weight.
15 parts by weight. Particularly preferably, "compound [1]" 1
"Compound [2]" is 0.01 to 0.06 with respect to parts by weight.
Weight part, "compound [3]" is 0.05 to 0.4 weight part.

When the composition of the present invention is actually used as a herbicide, the above-mentioned active ingredient is used together with a solid or liquid carrier known per se, a diluent, a surfactant, other auxiliary agents for formulation, and per se known. It can be mixed by the method described above to prepare a formulation form usually used as an agricultural chemical, for example, a wettable powder, granules, powder, water solution, flowable agent, emulsion and the like.

The solid carrier which can be used in the preparation includes
Clay group represented by kaolinite group, montmorillonite group, illite group or polygloskite group, in detail, pyrophyllite, attapulgite, sepiolite, kaolinite, bentonite, saponite,
Vermiculite, mica, talc, etc .; Other inorganic substances such as gypsum, calcium carbonate, dolomite, diatomaceous earth, calcite, magnesium lime, apatite, zeolite, anhydrous silicic acid, synthetic calcium silicate; soybean powder, tobacco powder, Vegetable organic substances such as walnut flour, wheat flour, wood flour, starch, crystalline cellulose; coumarone resin, petroleum resin,
Examples thereof include synthetic or natural polymer compounds such as alkyd resins, polyvinyl chloride, polyalkylene glycols, ketone resins, ester gums, cobal gums, dumbamar gums; waxes such as carnauba wax and beeswax, and urea.

Suitable liquid carriers include, for example, paraffinic or naphthenic hydrocarbons such as kerosene, mineral oil, spindle oil and white oil; aromatic hydrocarbons such as xylene, ethylbenzene, cumene and methylnaphthalene; monochlorobenzene and O. -Chlorinated hydrocarbons such as chlorotoluene; ethers such as dioxane and tetrahydrofuran; ketones such as methyl ethyl ketone, diisobutyl ketone, cyclohexanone, acetophenone and isophorone; ethyl acetate, amyl acetate, ethylene glycol acetate, diethylene glycol acetate, dibutyl maleate , Esters such as diethyl succinate;
Alcohols such as n-hexanol, ethylene glycol, diethylene glycol, cyclohexanol, benzyl alcohol; ethylene glycol ethyl ether,
Examples include ether alcohols such as ethylene glycol phenyl ether, diethylene glycol ethyl ether, and diethylene glycol butyl ether; polar solvents such as dimethylformamide and dimethyl sulfoxide, and water.

In addition, emulsification, dispersion, wetting, spreading, binding, control of disintegration of active ingredient, stabilization of active ingredient, improvement of fluidity,
Surfactants and other auxiliary agents can be used for the purpose of rust prevention and the like. Nonionic, anionic, cationic and zwitterionic compounds may be used as examples of the surfactant used, but usually nonionic and / or anionic compounds are used. Compounds of

Suitable nonionic surfactants include, for example, compounds obtained by polymerizing addition of ethylene oxide to higher alcohols such as lauryl alcohol, stearyl alcohol and oleyl alcohol; polymerization of ethylene oxide to alkylphenols such as isooctylphenol and nonylphenol. Compounds: Compounds obtained by polymerizing addition of ethylene oxide to alkylnaphthols such as butylnaphthol and octylnaphthol; Compounds obtained by polymerizing addition of ethylene oxide to higher fatty acids such as palmitic acid, stearic acid and oleic acid; amines such as dodecylamine and stearic acid amide A compound obtained by polymerizing addition of ethylene oxide to ethylene; a higher fatty acid ester of a polyhydric alcohol such as sorbitan and a compound obtained by polymerizing addition of ethylene oxide thereto; Compound Sid and propionic oxide was blocked polymerized addition, and the like.

Suitable anionic surfactants include, for example, alkyl sulphate salts such as sodium lauryl sulphate, oleyl alcohol sulphate amine salts; alkyl sulphonates such as sodium sulfosuccinate dioctyl ester and sodium 2-ethylhexene sulphonate. Acid salts; aryl sulfonates such as sodium isopropylnaphthalene sulfonate, sodium methylenebisnaphthalene sulfonate, sodium lignin sulfonate, and sodium dodecylbenzene sulfonate.

Further, in the composition of the present invention, in order to improve the performance of the preparation and enhance the herbicidal effect, casein, gelatin,
High molecular compounds such as albumin, glue, lignin sulfonate, alginate, gum arabic, carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, polyvinyl aldol, polyvinyl pyrrolidone, and polysaccharides and other auxiliary agents can be used together.

The above-mentioned carriers and auxiliary agents can be used alone or in combination depending on the purpose, taking into consideration the dosage form of the preparation, the application scene and the like. The content of the active ingredient in the composition of the present invention in various formulation types thus obtained varies depending on the formulation type, but is, for example, 0.01 to 99% by weight, preferably 0.1 to 80% by weight. It can be wt%.

In the case of a wettable powder, for example, the active ingredient is usually 1
The content is ˜90% by weight, and the balance is a solid carrier and a dispersion wetting agent, and a protective colloid agent, a defoaming agent and the like are added if necessary. In the case of granules, for example, the active ingredient is usually 0.01
˜35% by weight with the balance being a solid carrier, a surfactant and the like. The active ingredient is uniformly mixed with the solid carrier, or is uniformly or adsorbed on the surface of the solid carrier, and the particle diameter is about 0.2 to 1.5 mm.

In the case of a flowable agent, for example, the active ingredient is usually contained in an amount of 0.5 to 50% by weight, and 3 to 1 is added thereto.
0% by weight of a dispersion wetting agent is contained, the balance is water, and a protective colloid agent, a preservative, an antifoaming agent and the like are added if necessary. The appropriate amount of application of the composition of the present invention formulated as described above varies depending on weather conditions, soil conditions, formulation form, application time, application method, type of weeds, generation density, etc., but cannot be specified unconditionally, but generally per 1 ha The total amount of active ingredients is 0.21 to 6.6 kg, preferably 1.68 to 3.7 kg. When applied to paddy fields, emulsions, wettable powders, flowable agents, etc. are usually applied without diluting a predetermined amount thereof or diluted with an appropriate amount of water, and granules etc. are generally applied without any dilution. To do. Preferably, the dosage form is granules, and it is the simplest and the effect is stable to apply by using a rotary granulator, a power granulator, or the like.

Further, the composition of the present invention can be used as a labor-saving herbicide by appropriately blending other herbicides, insecticides, fungicides, plant growth regulators and the like into the composition. Further, if necessary, it can be used in combination with other various insecticides, fungicides, plant growth regulators, herbicides, fertilizers and other chemicals during spraying.

[0019]

[Examples] The present invention will be specifically described below with reference to Examples, but the compounding ratio, dosage form, etc. of the composition of the present invention are not limited to the Examples. The "parts" used in the following examples are based on weight. Example 1 (Granule) "Compound [1]" 5 parts "Compound [2]" 0.17 parts "Compound [3]" 1.5 parts Bentonite 35 parts Clay 54.33 parts Sodium dodecylbenzenesulfonate 2 parts 2 parts or more of sodium lignin sulfonate were mixed and pulverized to homogenize them, and then an appropriate amount of water was added and kneaded well, then granulated using a granulator and dried to obtain granules.

[0020]

The compounds used as the active ingredients of the composition of the present invention are known herbicides which are widely used. However, as described above, when each of these compounds is used alone, the weed species that can be controlled are limited and their efficacy is not sufficient.

The composition of the present invention not only complements each other against the above-mentioned weeds which are difficult to control with the respective active ingredient compounds alone, but also has such a low dosage that each compound alone cannot control them at all. , Annual weeds (Novier,
It has a high herbicidal effect on a wide range of grass species such as Cyperaceae, other broad leaves, etc.) and perennial weeds (Matsubai, Firefly, Heraomodaka, Urikawa, Mizugayatsuri, Omodaka, Hirumushiro, Shizui, Koukiyagara, Seri, Ezonosayasakusa, Kusumune, etc.). And it does not cause any chemical damage to paddy rice.

It is possible to select an arbitrary period of use from a time immediately after transplanting rice to a high period of weed development. The specific time of use can be arbitrarily selected from a wide range from before transplantation of rice to the peak of weed development (about 20 days after transplantation), but among them, it is most preferable to treat at the early stage of weed development (up to about 7 days after transplantation). A high herbicidal effect can be obtained.

Further, the composition of the present invention has a long-lasting herbicidal effect and does not substantially allow the generation of weeds until the rice harvest season.
These excellent effects clearly indicate that there is a strong synergistic effect between the respective active ingredients contained in the composition of the present invention, and each of them exhibits an effect which cannot be predicted from the herbicidal properties of each alone. It is a thing.

Further, in the composition of the present invention, each active ingredient has a high herbicidal activity and further has a strong synergistic effect, so that the amount of the active ingredient to be dropped can be extremely small as compared with conventional herbicides. Therefore, it is safe to the environment and farmers, and can be said to be a herbicide that meets the needs of the times. Next, the effect of the composition of the present invention will be specifically shown by way of test examples.

Test Example 1 (Effect of Reduction of Dosage by Mixing) Paddy soil and chemical fertilizer were put in a Wagner pot having an area of 1 / 2000a, and an appropriate amount of water was added thereto and sufficiently stirred to form a paddy field. Two seedlings of two-leaf stage, which had been grown in the greenhouse in advance, were transplanted to each plant as two strains per pot, and seeds of Nobie, Konagi, Azena, Firefly, and tubers of Urikawa, Mizugaya-tsuri, and Kurogwai were used in fixed amounts. Seed each. Seven days after transplantation, a predetermined amount of the test compound was treated with granules (prepared according to Example 1). Table 1 shows the results of an investigation of the herbicidal effect and the degree of damage to paddy rice after 30 days from the chemical treatment.

The herbicidal effect and the degree of phytotoxicity of paddy rice against each grass species in the table are as shown in the table below, each of 6 grades from "0" to "5" and from "-" to "x". It is represented by a 6-level code.

[0027]

[Table 1]

From these results, the composition of the present invention controls annually weeds and difficult-to-control weeds such as firefly, Urikawa, Mizugaya-tsuri, and Kurogwai at extremely low doses as compared with the case where each active ingredient is used alone. I knew I could do it. Test Example 2 (Effect of expanding the period of use by mixing) A pot prepared in the same manner as in Test Example 1 except that the plant to be tested was Novier was treated with the granules prepared according to the Example, daily. 50 days after the pot preparation, the herbicidal effect was judged according to the same criteria as in Test Example 1. The results are shown in Table 2.

[0029]

[Table 2]

From the results shown in Table 2, it was confirmed that each active ingredient of the compositions of the present invention act synergistically to remarkably extend the herbicidal period. Test Example 3 (field test) Using paddy sheet (Shin-Etsu Chemical Co., Ltd .: trade name "Azenami"), a paddy field that has been planted according to a normal farming method has a section of 10 m ² (4 m x 2.5 m) Each of the chemicals (granules) was treated on the 10th day after rice planting. After that, the usual control was performed, and 40 days after the chemical treatment, the herbicidal effect and the paddy rice phytotoxicity were determined according to the same criteria as in Test Example 1.

The results are shown in Table 3. The weeds are all naturally occurring except for sowing the Novier seeds.

[0032]

[Table 3]

As shown by the results of the above Test Examples 1 to 3,
INDUSTRIAL APPLICABILITY The composition of the present invention can control various weeds effectively with a low dose, which is unprecedented with conventional herbicides, and is extremely promising as an agricultural material.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kumiko Tamura 8-3-1 Chuo, Ami-cho, Inashiki-gun, Ibaraki Mitsubishi Petrochemical Co., Ltd. Tsukuba Research Institute

Claims (1)

[Claims] 1. S- (1-methyl-1-phenylethyl) piperidine-1-carbothioate and methyl 2-[[[[[[4,6-dimethoxypyrimidin-2-yl] amino] carbonyl]. A herbicide composition for paddy fields comprising three components of amino] sulfonyl] methyl] benzoate and 2,3-dihydro-3,3-dimethyl-5-benzofuranylethanesulfonate as active ingredients.