JPH0543406A - Herbicide composition for paddy field - Google Patents

Abstract

PURPOSE:To provide a herbicide for paddy field, effective at a low rate of application, capable of controlling a wide variety of weeds and safe to paddy rice plant. CONSTITUTION:The objective herbicide composition for paddy field contains 1,3-dimethyl-4-(2,4-dichloro-3-methylbenzoyl)-5-(4-methylphenacyloxy) pyrazole, 2-(2,4-dichloro-3-methylphenoxy)-propionanilide, 0-3-tert-butylphenyl-6-methoxy-2 pyridyl(methyl)thiocarbamate and (RS)-2-bromo-N-(alpha,alphadimethylbenzyl)-3,3- dimethylbutylamide as active components.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a herbicide composition, and more particularly to a herbicide composition for paddy fields, which is applied to paddy rice before and after transplantation, to safely control paddy field weeds and effectively control weeds in paddy fields.

[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 active ingredients.
However, although these agents are relatively effective against annual weeds, their effects on perennial weeds are insufficient,
Therefore, in recent years, the number of perennial weeds with strong reproductive ability such as firefly, sea urchin, and corydalis has been increasing in the rice fields in Japan.

JP-A-63-8305 discloses 1,3.
-Dimethyl-4- (2,4-dichloro-3-methylbenzoyl) -5- (4-methyl-phenacyloxy) pyrazole and O-3-tert-butylphenyl-6-methoxy-2-pyridyl (methyl ) Thiocerbamate and (R
S) -2-Bromo-N- (α, α-dimethylbenzyl)
A herbicidal composition containing three compounds with -3,3-dimethylbutyramide as an active ingredient is disclosed. This herbicide composition has been put into practical use, and it is known that it exhibits excellent effects not only on annual weeds but also on perennial weeds such as firefly, Urikawa and Mizugayatsuri, and that it has high rice paddy safety under normal use conditions. However, under adverse conditions such as extreme deep water, it sometimes causes chemical damage, and does not always satisfy the demands of farmers.

[0004]

Therefore, a herbicide for paddy fields which is safe for rice and effectively controls a wide range of weeds by being applied before and after transplanting rice, which causes less weeds and is poor in reproductive ability. Development is desired.

[0005]

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, it is possible to selectively control a wide range of weeds in a paddy field by combining four kinds of compounds having different herbicidal mechanisms and spectrums, preferably in a specific ratio, and to use them alone for their herbicidal effect. The herbicidal composition of the present invention has been completed by finding that the herbicidal composition increases synergistically as compared with the case where it can be applied at a low dose and the herbicidal spectrum is broadened.

That is, the present invention relates to 1,3-dimethyl-4-
(2,4-dichloro-3-methylbenzoyl) -5-
(4-methyl-phenacyloxy) pyrazole (this may be referred to as "Compound 1") and 2- (2,4-dichloro-3-methylphenoxy) -propionanilide (this is referred to as "Compound 2"). Sometimes called), O-3-
tert-Butylphenyl-6-methoxy-2-pyridyl (methyl) thiocarbamate (this is sometimes referred to as “compound 3”) and (RS) -2-bromo-N- (α,
The present invention provides a herbicide composition for paddy fields, which comprises α-dimethylbenzyl) -3,3-dimethylbutyramide (this may be referred to as compound 4) as an active ingredient.

[0007]

DETAILED DESCRIPTION Compound 1, compound 2, compound 3 and compound 4 used as active ingredients of the composition of the present invention are known herbicides that are widely used. That is, the compound 1 is disclosed in JP-A-57-72903, the compound 2 is disclosed in JP-A-57-171904, the compound 3 is disclosed in JP-A-59-51266, and the compound 4 is disclosed in JP-A-57-1512.
It is disclosed in each of JP-A 5-43014.

The composition of the present invention may contain four kinds of active ingredients (Compound 1, Compound 2, Compound 3 and Compound 4) in a wide range of ratios, but usually 1 part by weight of Compound 1 is used. 0.01 to 100 parts by weight of compound 2, 0.01 to 100 parts by weight of compound 3, and 0.01 to 1 of compound 4
00 parts by weight, preferably compound 1, 0.05 to 5 parts by weight of compound 2, 0.1 to 10 parts by weight of compound 3, and 0.1 to 10 parts by weight of compound 4 based on parts by weight.

When the composition of the present invention is actually used as a herbicide, the above-mentioned active ingredient is used as a solid or liquid carrier or diluent known per se, a surfactant or other formulation auxiliary agent, and a method known per se. It is possible to prepare a formulation form usually used as an agricultural chemical, for example, a granule, an emulsion, a wettable powder, a flowable formulation and the like.

Solid carriers that can be used in the production of herbicides include kaolinite group, montmorillonite group, clay group represented by illite group or polygloskite group, more specifically, pyrophyllite, attapulgite,
Sepiolite, kaolinite, bentonite, saponite, vermiculite, mica, talc, etc .; gypsum, calcium carbonate, dolomite, diatomaceous earth, calcite, magnesium lime, apatite, zeolite, anhydrous silicic acid, synthetic calcium silicate, etc. Substances: Soybean flour, tobacco flour, walnut flour, wheat flour, wood flour, starch, crystalline cellulose and other plant organic substances; coumarone resin, petroleum resin, alkyd resin, polyvinyl chloride, polyalkylene glycol, ketone resin, ester gum, Examples thereof include synthetic or natural polymer compounds such as cobal gum and dammal gum; 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; trichloroethylene and monochloro. Chlorinated hydrocarbons such as benzene and o-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 Esters such as acetate, dibutyl maleate and diethyl succinate; n-hexanol, ethylene glycol, diethylene glycol, cyclohexanol,
Alcohols such as benzyl alcohol; ether alcohols such as ethylene glycol ethyl ether, 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 of the active ingredient,
Surfactants and other auxiliary agents can be used for the purpose of spreading, binding, controlling disintegration, stabilizing active ingredient, improving fluidity, and preventing rust. Examples of surfactants used include:
Nonionic, anionic, cationic and zwitterionic compounds can be used, but usually nonionic and / or anionic compounds are used.

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; polymerizing addition 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; ethylene The Kishido propylene oxide compound was block polymerized addition and the like.

Suitable anionic surfactants include, for example, alkyl sulphate salts such as sodium lauryl sulphate, oleic alcohol sulphate amine salts; alkyl succinate dioctyl esters, sodium 2-ethylhexene sulphonate and the like. Sulfonates; aryl sulfonates such as sodium isopropylnaphthalenesulfonate, sodium methylenebisnaphthalenesulfonate, sodium ligninsulfonate, sodium dodecylbenzenesulfonate, and the like. Furthermore, in order to improve the performance of the composition of the present invention and enhance the herbicidal effect, casein, gelatin, albumin, glue, lignin sulfonate, alginate, acacia, carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, polyvinyl are used. Polymer compounds such as aldol, polyvinylpyrrolidone, and polysaccharides and other auxiliary agents can also be used in combination. The above-mentioned carrier and various kinds of auxiliary agents can be appropriately used alone or in combination depending on the purpose in consideration of 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 the various dosage forms thus obtained varies depending on the dosage form, but is, for example, 0.01 to 99% by weight, preferably 0.1. Can be up to 80% by weight. In the case of a wettable powder, for example, the active ingredient is usually contained in an amount of 1 to 90% by weight, and the rest is a solid carrier and a dispersion wetting agent, and if necessary, a protective colloid agent, a defoaming agent and the like are added.

In the case of granules, for example, the active ingredient is usually added to
The content is 01 to 35% by weight, and the rest is a solid carrier, a surfactant and the like. The active ingredient is uniformly mixed with the solid carrier, or is fixed or adsorbed uniformly 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, the dispersion wetting agent is contained in an amount of 3 to 10% by weight, and the balance is water. A protective colloid agent, an antiseptic agent, an antifoaming agent and the like are added.

The appropriate application amount of the composition of the present invention prepared as described above cannot be unconditionally specified due to differences in meteorological conditions, soil conditions, drug formulation, target crops, target weeds, application time, application method and the like. Ordinarily, 0.01-10 kg per 10 ares based on the total amount of active ingredients, preferably
A range of 0.02-4 kg is suitable. Further, the composition of the present invention can be made into a labor-saving control agent by appropriately adding other insecticides, fungicides, plant growth regulators and the like. 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. Example 1 (Wettable powder) Compound 1 10% by weight Compound 2 3% by weight Compound 3 5.7% by weight Compound 4 6% by weight Sodium lignin sulfonate 3% by weight Sodium dialkylnaphthalene sulfonate 3% by weight Kaolin 69.3% by weight % And more were mixed and pulverized to obtain a uniform wettable powder.

Example 2 (Flowable Agent) Compound 1 10% by weight Compound 2 3% by weight Compound 3 5.7% by weight Compound 4 6% by weight Polyoxyethylene lauryl ether 2% by weight Lauryl sulfate sodium salt 2% by weight Zansan gum 0 0.2 wt% water 71.1 wt% The above was wet pulverized with a wet ball mill to obtain a flowable agent.

Next, the effects of the composition of the present invention will be concretely shown with reference to test examples. Test Example 1 (Effect of dose reduction due to mixing-3 days after treatment after transplantation) Area 1 /
The paddy field soil and the chemical fertilizer were put into a 2000a Wagner pot, an appropriate amount of water was added, and the mixture was thoroughly stirred to make a paddy field. Two 2-leaf stage rice seedlings, which had been grown in the greenhouse in advance, were transplanted to each plant as 2 strains per pot, and seeds of Novier, Kokonagi, Azena, and Firefly were sown in fixed amounts, and tubers of Urikawa and Mizugayatsuri were planted. Were planted in fixed amounts.

Five days after transplantation, a predetermined amount of the test compound was treated with a flowable agent (prepared according to Example 2). Table 2 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. In addition, the herbicidal effect and the degree of phytotoxicity of paddy rice against each grass species in the table are 6 from "0" to "5" as shown in the table of the following herbicidal effect and phytotoxicity of paddy rice.
It is expressed by the grade of the stage and the code of 6 stages from "-" to "x".

[0023]

[Table 1] Table 1 Herbicidal effect Paddy rice damage degree of damage Rating Herbicidal rate (%) Code Damage degree 5 100 × withered 4 over 80 less than 100 +++ major harm 3 over 60 less than 80 ++ more than 2 40 over 60 less + Small harm 1 over 20 and 40 or less ± Minor harm 0 to 20 or less-harmless

[0024]

[Table 2]

From these results, it was found that the composition of the present invention can control various weeds with an extremely low dose as compared with the case where each active ingredient is used alone.

Test Example 2 (Field Test) A paddy field that was planted according to a normal farming method was divided into 10 m ² (4 m × 2.5 m) using a ridge sheet (Shin-Etsu Chemical Co., Ltd .; trade name “Azenami”). ), And each drug (flowable agent prepared according to Example 2) was treated 5 days after rice planting. Thereafter, ordinary control was performed, and 30 days after the chemical treatment, the control effect and the rice damage to paddy rice were judged according to the same criteria as in Test Example 1. The results are shown in Table 3.

[0027]

[Table 3]

As shown by the results of the above Test Examples 1 and 2,
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.

[0029]

As is apparent from the above-mentioned test examples, the composition of the present invention can be applied to a wide variety of weeds such as Nobie, Azena, Kokonagi, Firefly, Urikawa and Mizugaya-tsuri with a low dose which cannot be achieved by each compound alone. It shows high herbicidal effect and does not cause any phytotoxicity to paddy rice. Also, when to use
It can be arbitrarily selected from a wide range from before rice transplantation to the early stage of weed development (about 20 days after transplantation), but among them, it is best to treat from before the emergence of weeds to the initial stage (7 days before transplantation to about 10 days after transplantation). A high herbicidal effect can be obtained.

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, which is completely expected from the herbicidal properties of each of them. It shows the effect that is not done. In addition, the composition of the present invention has a high herbicidal activity of each active ingredient alone, and has a strong synergistic effect, so that the amount of the active ingredient applied can be extremely small as compared with conventional herbicides. Therefore, it is highly safe for the environment and farmers,
It can be said that it is a herbicide that meets the needs of the times.

Continuation of the front page (72) Inventor Takeki Hara Nagano City, Nagano Prefecture Hirotomi Takeshi 173-2 Yashima Chemical Industry Co., Ltd.

Claims (1)

[Claims] 1. 1,3-Dimethyl-4- (2,4-dichloro-3-methylbenzoyl) -5- (4-methyl-phenacyloxy) pyrazole and 2- (2,4-dichloro-3). -Methylphenoxy) -propionanilide,
O-3-tert-butylphenyl-6-methoxy-2-pyridyl (methyl) thiocarbamate, and (RS) -2-
Bromo-N- (α, α-dimethylbenzyl) -3,3-
A herbicide composition for paddy fields containing dimethylbutyramide as an active ingredient.