JPH10287515A - Herbicide composition for paddy field - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition capable of alleviating phytotoxicity to paddy rice plants without damaging highly herbicidal effects even in defective environmental conditions, by using both two kinds of compounds. SOLUTION: This composition comprises (A) 6-methyl-3-[1-methyl-1(3,5- dichlorophenyl)-ethyl]-5-phenyl-2,3-dihydro-4H-1,3-oxazin-4-one of formula I and (B) one selected from 1-(α,α-dimethylbenzyl)-3-(p-tolyl)urea of formula II, 1-(2 chlorobenzyl)-3-(α-α-dimethylbenzyl)urea of formula III and S-(α,α-dimethylbenzyl) piperidine-1-carbothioate of formula IV and 2-benzothiazolylthiopropionic acid of formula V, etc. The composition is mixed with a solid or liquid carrier, a surfactant, auxiliaries for preparation, etc., and formulated to give a herbicide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a herbicidal composition, and more particularly to a herbicidal composition, which is extremely safe for paddy rice when applied before, during or after transplanting.
The present invention relates to a paddy field herbicide composition that exhibits a high herbicidal effect on annual paddy field weeds.

[0002]

2. Description of the Related Art 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 mixture containing two or more active ingredients.
However, these agents are generally effective on annual weeds, but lack effect on perennial weeds. On the other hand, those that are relatively effective against perennial weeds often cause problems such as insufficient effect on annual weeds, occurrence of resistant weeds, and chemical damage to rice. It is widely practiced to mix two or more herbicides with different effects to broaden the herbicidal spectrum and to enhance the herbicidal effect, but generally the additive effect of the mixture is additive. Within the range, there is a tendency that phytotoxicity to rice is promoted with the enhancement of the effect.

[0003]

The compound of the formula (1), which is an active ingredient of the present invention, exhibits a high herbicidal effect on annual weeds at an extremely low dose as compared with the dose of conventional herbicides.
Also, the paddy rice seedlings do not cause any problematic phytotoxicity under normal use conditions in the field. However, under poor environmental conditions, for example, poor rice planting conditions such as shallow planting, the growth of paddy rice may be suppressed. An object of the present invention is to provide a paddy field herbicide capable of reducing phytotoxicity without impairing the high herbicidal effect of the compound of the formula (1) even under such poor environmental conditions.

[0004]

Means for Solving the Problems The present inventors have conducted various studies on combinations of the compound of the formula (1) with a large number of compounds in order to solve the above problems. As a result, the compound of formula (1) has the compound of formula (1) by combining the compound of formula (2), (3), (4), (5) or (6) with the compound of formula (1), preferably at a specific ratio. It has been found that the compound can reduce the phytotoxicity of the compound of formula (1) to paddy rice to a virtually negligible level without impairing the high herbicidal effect.
The herbicidal composition of the present invention has been completed.

That is, the present invention provides the following formula (1):

[0006]

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6-methyl-3- [1-methyl-1 (3,5-dichlorophenyl) -ethyl] -5-phenyl-2,3-dihydro-4H-1,3-oxazine-4- ON and the following equation (2)

[0008]

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1- (α, α-dimethylbenzyl) -3- (p-tolyl) urea (generic name: Daimlon, "Agrochemical Handbook", published by the Japan Plant Protection Association, 1994, 358- 359 and 607
Page) or the following formula (3)

[0010]

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1- (2-chlorobenzyl)-represented by the formula
3- (α, α-dimethylbenzyl) urea (generic name: cumylurone, described in JP-A-60-172910) or the following formula (4)

[0012]

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S- (α, α-dimethylbenzyl) piperidine-1-carbothioate (generic name:
Dimepiperate, described in JP-A-51-98331) The following formula (5)

[0014]

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2-benzothiazolylthiopropionic acid (described in JP-B 1-28108) or the following formula (6)

[0016]

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A herbicide for a paddy field comprising, as an active ingredient, one compound selected from the compounds represented by 2-benzothiazolylthioacetic acid (described in Japanese Patent Publication No. 1-28108). The present invention provides an agent composition.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Compound (1) used as an active ingredient of the composition of the present invention is described in International Patent Publication No. WO 95-.
No. 02329, which is a compound having herbicidal activity at an extremely low dose, compounds (2), (3) and (4) are known herbicides, and compounds (5) and (6) are known herbicides. Compound.

In the composition of the present invention, the mixing ratio of compound (1) and compounds (2), (3), (4), (5) or (6) is not strictly limited, and Depending on the application area of the herbicide composition, applicable weeds, application time, etc.
Although it can be varied over a wide range, generally, the compound (2) is used in an amount of 0.01 to 10 per part by weight of the compound (1).
00 parts by weight, preferably 1 to 100 parts by weight, compound (3)
0.01 to 1000 parts by weight, preferably 1 to 100 parts by weight, compound (4) 0.01 to 1000 parts by weight, preferably 1 to 100 parts by weight, compound (5) 0.01 to 1000 parts by weight, Suitably 1 to 100 parts by weight, compound (6) 0.0
It is appropriate to mix it in an amount of 1 to 1000 parts by weight, preferably 1 to 100 parts by weight.

When the composition of the present invention is actually used as a herbicide, the above active ingredient is mixed with a solid or liquid carrier or diluent known per se, a surfactant, or other pharmaceutical auxiliaries to form a pesticide. The preparation can be prepared in the usual preparation form used, for example, granules, emulsions, wettable powders, flowables, dry flowables and the like.

Solid carriers usable in the production of herbicides include clays represented by the kaolinite group, montmorillonite group, illite group and polyglossite group, more specifically, pyrophyllite, attapulgite, sepiolite, kaolinite, bentonite. , Saponite, vermiculite, mica, talc, etc., and plaster,
Calcium carbonate, dolomite, diatomaceous earth, calcite, magnesium lime, apatite, zeolite, silica,
Inorganic substances such as synthetic calcium silicate; soybean flour, tobacco flour, walnut flour, flour, wood flour, starch, crystalline cellulose and other plant organic substances; coumarone resin, petroleum resin, alkyd resin, polyvinyl chloride, polyalkylene glycol And synthetic or natural polymer compounds such as ketone resin, ester gum, copal gum and dammar 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, monochlorobenzene Chlorinated hydrocarbons such as 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 acetate, and maleic Esters such as dibutyl acrylate 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, and wetting of the active ingredient
Surfactants, fixing agents and other auxiliaries can be used for the purpose of spreading, fixing, binding, controlling disintegration, stabilizing the active ingredient, improving fluidity, preventing rust and the like. As examples of surfactants used, any of non-ionic, anionic, cationic and zwitterionic compounds may be used, but usually non-ionic and / or anionic Compounds are used. Suitable nonionic surfactants include, for example, compounds obtained by polymerizing ethylene oxide with higher alcohols such as lauryl alcohol, stearyl alcohol and oleyl alcohol; compounds obtained by polymerizing ethylene oxide with alkylphenols such as isooctylphenol and nonylphenol; butyl Compounds obtained by polymerization addition of ethylene oxide to alkyl naphthols such as naphthol and octyl naphthol; palmitic acid,
Compounds obtained by polymerizing ethylene oxide with higher fatty acids such as stearic acid and oleic acid; Compounds obtained by polymerizing ethylene oxide with amines such as dodecylamine and amine stearate; higher fatty acid esters of polyhydric alcohols such as sorbitan and ethylene oxide Compounds obtained by polymerization addition; compounds obtained by block polymerization addition of ethylene oxide and propylene oxide. Suitable anionic surfactants include, for example, alkyl sulfates such as sodium lauryl sulfate and amine salt of oleic alcohol sulfate; alkyl sulfonates such as sodium dioctyl sulfosuccinate and sodium 2-ethylhexene sulfonate; And arylsulfonic acid salts such as sodium isopropylnaphthalenesulfonate, sodium methylenebisnaphthalenesulfonate, sodium ligninsulfonate and sodium dodecylbenzenesulfonate. The composition of the present invention further improves the performance of the formulation, and for the purpose of enhancing the herbicidal effect, casein, gelatin, albumin, glue, ligninsulfonate, alginate, acacia, xanthan gum, carboxymethylcellulose, methylcellulose, hydroxyethylcellulose , Polyvinyl alcohol, polyvinylpyrrolidone, polysaccharides and other high molecular compounds and other auxiliaries can also be used in combination.

The above carriers and various auxiliaries can be used singly or in combination according to the purpose, taking into account 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 preparations thus obtained may vary depending on the preparation, for example, 0.01 to 99% by weight, and preferably 0.1 to 99% by weight. ~ 80% by weight.

In the case of wettable powders, for example, the active ingredient is usually 1
To 90% by weight, with the balance being a solid carrier and a dispersing wetting agent to which a protective colloid agent, an antifoaming agent and the like are added if necessary.

[0027] In the case of granules, for example, the active ingredient is usually contained in 0.1 mg.
The content is from 01 to 35% by weight, and the balance is a solid carrier and / or a surfactant. The active ingredient is uniformly mixed with the solid carrier, or is uniformly fixed or adsorbed on the surface of the solid carrier, and the diameter of the particles is about 0.05 to 3.0 m.
m, preferably about 0.2-1.5 mm.

In the case of a flowable, for example, the active ingredient is usually contained in an amount of 0.5 to 50% by weight, and 3 to 10% by weight.
% By weight of a dispersing wetting agent, the balance being water, and if necessary, protective colloids, preservatives, defoamers, etc. are added.

The appropriate amount of application of the composition of the present invention prepared as described above cannot be specified unconditionally due to differences in weather conditions, soil conditions, pharmaceutical preparation forms, target crops, target weeds, application timing, application methods, and the like. Usually, the range is 0.01 to 1000 kg, preferably 0.1 to 100 kg, per hectare based on the total amount of the active ingredients. Furthermore, the composition of the present invention can be used as a labor-saving control agent by appropriately mixing other insecticides, fungicides, plant growth regulators and the like.

If necessary, it can be mixed with other various insecticides, fungicides, plant growth regulators, herbicides and other drugs or fertilizers when spraying.

Hereinafter, the present invention will be described specifically with reference to examples.

[0032]

Example 1 (Floable agent) Compound (1) 2% by weight Compound (2) 8% by weight Polyoxyethylene nonylphenyl ether 2% by weight Sodium dioctylsulfosuccinate 2% by weight Xanthan gum 0.2% by weight Water 85. 8% by weight or more was wet-pulverized by a wet ball mill to obtain a flowable agent.

Example 2 (Granules) 1% by weight of compound (1) 15% by weight of compound (3) 3% by weight of sodium ligninsulfonate 1% by weight of sodium alkylnaphthalenesulfonate 30% by weight of bentonite 50% by weight of talc After pulverization, the mixture was granulated by a usual method using a granulator and dried to obtain granules.

Example 3 (Granules) 1% by weight of compound (1) 10% by weight of compound (4) 3% by weight of sodium ligninsulfonate 1% by weight of sodium alkylnaphthalenesulfonate 30% by weight of bentonite 55% by weight of talc or more The mixture was pulverized to obtain a uniform wettable powder.

Example 4 (Wettable powder) 1% by weight of compound (1) 10% by weight of compound (5) 3% by weight of sodium ligninsulfonate 3% by weight of sodium dialkylnaphthalenesulfonate 83% by weight of kaolin A uniform wettable powder was obtained.

Example 5 (Wettable powder) 1% by weight of compound (1) 10% by weight of compound (6) 3% by weight of sodium ligninsulfonate 3% by weight of sodium dialkylnaphthalenesulfonate 83% by weight of kaolin A uniform wettable powder was obtained.

Next, the effects of the composition of the present invention will be specifically described with reference to test examples.

Test Example 1 (Effect of reducing the amount of medicine and reduction of harmful effects of soil treatment by mixing) Paddy soil and chemical fertilizer are placed in a concrete pot of 2500 cm ² placed outdoors, and an appropriate amount of water is added and thoroughly mixed. And put it in a paddy field. In addition to this, Echinochloa oryzicol
a), Monochoria (Monochoria vaginal)
is) and Azena (Lindernia procum)
bens) seeds were sown in predetermined amounts, and two 2-leaf stage rice seedlings (variety: Koshihikari) that had been grown in advance in a greenhouse were set as 2 strains, and 3 strains each were 2 cm (referred to as normal planting). Implantation was performed at a depth of 5 cm (referred to as shallow planting) to a depth of 3 cm.

On the day of transplantation, a predetermined amount of the test compound was treated with a wettable powder. After the treatment, a water leakage operation of 2 cm / day was performed for 3 days.

The test was repeated twice, and after 30 days from the chemical treatment, the herbicidal effect and the degree of rice phytotoxicity were investigated.
4, 5 and 6.

In the table, the herbicidal effect and the degree of damage to paddy rice for each herbaceous species are expressed in six grades from "0" to "5" as shown in Table 1 below. did.

The fresh weight of each rice plant above and below the ground was measured and used as an index for reducing phytotoxicity.

Test Example 2 (Effect of reducing the amount of medicine and the effect of soil treatment by foliage and soil treatment by mixing) A test pot was prepared in the same manner as in Test Example 1, and a predetermined amount of the test compound was added to water 5 days after transplantation. The treatment was carried out using a wetting agent.

Tables 7, 8, 9, 10 and 11 show the results of the investigation of the herbicidal effect and the degree of rice phytotoxicity 30 days after the chemical treatment.

In the table, the herbicidal effect and the degree of rice phytotoxicity for each grass species are expressed in six grades from "0" to "5", respectively, as shown in Table 1 below. did. In the same manner as in Test Example 1, the fresh weight of each rice plant above and below the ground was measured and used as an index for reducing phytotoxicity.

[0046]

[Table 1]

[0047]

[Table 2]

[0048]

[Table 3]

[0049]

[Table 4]

[0050]

[Table 5]

[0051]

[Table 6]

[0052]

[Table 7]

[0053]

[Table 8]

[0054]

[Table 9]

[0055]

[Table 10]

[0056]

[Table 11]

From these results, it was confirmed that the composition of the present invention had a clear phytotoxicity-reducing action without impairing the herbicidal effect as compared with the case where each active ingredient was used alone. As a result, at a very low dose, the Japanese millet (Echi
nochloa oryzicola, Konagi (Mo)
Nochia vaginalis and Azena (Lindernia procumbens) were found to be controllable. Furthermore, it was also found that the composition of the present invention significantly reduces the phytotoxicity compared to the use of compound (1) alone.

[0058]

EFFECT OF THE INVENTION As is clear from the above-mentioned test examples, the composition of the present invention shows high safety against paddy rice, which could not be expected with compound (1) alone, and shows a decrease in herbicidal effect. Not at all.

The period of use can be arbitrarily selected from a wide range from before rice transplantation to the early stage of weed growth (about 20 days after transplantation). If the treatment is carried out until about 15 days later, the highest herbicidal effect can be obtained.

These excellent effects are clearly shown by the compounds (2), (3), (4) and (5) contained in the composition of the present invention.
Or (6) indicates that the compound (1) has a phytotoxicity-reducing effect, and can provide a safer herbicide for paddy rice, which is a very useful technique in agriculture.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI A01N 43:78)

Claims (1)

[Claims] [Claim 1] The following formula (1) 6-methyl-3- [1-methyl-1 (3,5
-Dichlorophenyl) -ethyl] -5-phenyl-2,
3-dihydro-4H-1,3-oxazin-4-one and the following formula (2): 1- (α, α-dimethylbenzyl) -3- represented by
(P-tolyl) urea or the following formula (3): 1- (2-chlorobenzyl) -3- (α, α
-Dimethylbenzyl) urea or the following formula (4): S- (α, α-dimethylbenzyl) piperidine-1-carbothioate represented by the following formula or the following formula (5): 2-benzothiazolylthiopropionic acid represented by the following formula (6): And a compound selected from 2-benzothiazolylthioacetic acid represented by formula (1) as an active ingredient.