JPH08245321A - Herbicide composition for paddy field - Google Patents

Abstract

PURPOSE: To obtain the subject composition containing a dichloropropinyloxyphenyl dimethylethyloxadiazolone, etc., as an active ingredient, capable of controlling a wide range of weeds at low doses, causing no chemical injuries on paddy rice, and excellent in safety to farmers. CONSTITUTION: This herbicidal composition for paddy field contains, as active ingredients, (A) 3-[2,4-dichloro-5-(2-propinyloxy)phenyl]-5-(1,1-dimethylethyl)-1,3,4- oxadiazol-2(3H)-one of formula I and (B) 1-(α,α-dimethylbenzyl)-3-p-tolylurea of formula II in a weight ratio B/A of pref. 1-500, being applied pref. at 0.02-4 kg/ha based on the total amount of the 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, and more particularly to a herbicide composition for paddy fields which is safe for paddy rice and effectively controls paddy field weeds by being applied before and after transplanting of the rice.

[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, such as firefly, sea urchin, and cypress, which have strong reproductive ability, has been increasing in rice fields in Japan.

[0003]

[Problems to be Solved by the Invention] Therefore, weeding for paddy field which is safe for rice and effectively controls a wide range of weeds by applying it before and after transplanting paddy rice, which causes few weeds and is poor in fertility. The development of agents is desired.

[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, it is possible to selectively control a wide range of weeds in paddy fields by combining two compounds having different herbicidal mechanisms and spectrums, preferably in a specific ratio, and the herbicidal effect is obtained when they are used alone. It was found that the herbicidal composition of the present invention was completed, and that the herbicidal composition of the present invention was increased by synergistically increasing the amount of the herbicide.

The present invention provides (A) the following formula I:

[0006]

Embedded image

3- [2,4-dichloro-5-] represented by
(2-Propinyloxy) phenyl] -5- (1,1-
Dimethylethyl) -1,3,4-oxadiazol-2
(3H) -one (compound A) and (B) the following formula II:

[0008]

[Chemical 4]

A herbicidal composition for paddy fields comprising 1- (α, α-dimethylbenzyl) -3-p-tolylurea (compound B) represented by the formula (1) as an active ingredient. is there.

[0010]

DETAILED DESCRIPTION OF THE INVENTION Compound A used as an active ingredient of the composition of the present invention is a compound having an extremely low dose of herbicidal activity, which has been filed in JP-A-48-08936.
Is a known herbicide disclosed in JP-B-48-35454.

In the composition of the present invention, the blending ratio of the component A and the component B is not strictly limited, and it depends on the application site, application target, application time, etc. of the final herbicide composition.
Although it can be varied over a wide range, it is generally suitable to add 0.01 to 1000 parts by weight, preferably 1 to 500 parts by weight of compound B per 1 part by weight of compound A.

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 auxiliaries for formulation, and a method known per se. It is possible to prepare a formulation form which is usually used as an agricultural chemical, for example, granules, emulsions, wettable powders, flowable formulations 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 and polygloskite group, and more specifically, pyrophyllite, attapulgite, sepiolite, kaolinite, Inorganic substances such as bentonite, saponite, vermiculite, mica, talc and 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, alkyd resin, polyvinyl chloride, polyalkylene glycol,
Synthetic or natural polymer compounds such as ketone resins, ester gums, cobal gums, dammal gums; carnauba wax,
Examples thereof include waxes such as beeswax and urea.

Examples of suitable liquid carriers include 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 purposes of spreading, binding, controlling disintegration, stabilizing active ingredients, 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; compounds obtained by polymerizing addition of ethylene oxide to alkylphenols such as isooctylphenol and nonylphenol; butyl. Compounds obtained by polymerizing addition of ethylene oxide to alkylnaphthols such as naphthol and octylnaphthol; Compounds obtained by polymerizing addition of ethylene oxide to higher fatty acids such as palmitic acid, stearic acid and oleic acid; ethylene oxide added to amines such as dodecylamine and stearic acid amide. Polymerization-added compound; higher fatty acid ester of polyhydric alcohol such as sorbitan and compound obtained by polymerization-adding ethylene oxide thereto; Compound propylene oxide was blocked polymerized addition and the like. Suitable anionic surfactants include, for example, alkyl sulphate salts such as sodium lauryl sulphate and oleic alcohol sulphate amine salts; alkyl sulphonates such as sodium sulfosuccinate dioctyl ester and sodium 2-ethylhexene sulphonate. And aryl sulfonates such as sodium isopropyl naphthalene sulfonate, sodium methylenebisnaphthalene sulfonate, sodium lignin sulfonate, and sodium dodecylbenzene sulfonate. The composition of the present invention further improves the performance of the formulation, for the purpose of enhancing the herbicidal effect, casein, gelatin, albumin, glue, lignin sulfonate, alginate, acacia, carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose,
Polymer compounds such as polyvinyl aldol, polyvinyl pyrrolidone, and polysaccharides and other auxiliary agents can be used together.

The above carriers 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 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 added in an amount of 0.
The content is 01 to 35% by weight, and the rest is a solid carrier and a surfactant. 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. Usually, 0.01 to 10 kg per hectare, based on the total amount of active ingredients, preferably
A range of 0.02-4 kg is suitable. Furthermore, the composition of the present invention can be used as a labor-saving control agent by appropriately adding other insecticides, fungicides, plant growth regulators and the like.

Further, if necessary, it can be mixed and used with other various insecticides, fungicides, plant growth regulators, herbicides, fertilizers and the like during spraying.

The present invention will be specifically described below with reference to examples.

[0024]

【Example】

Example 1 (flowable agent) Compound A 1.2% by weight Compound B 40% by weight Polyoxyethylene nonylphenyl ether 2% by weight Sodium dioctylsulfosuccinate 2% by weight Zansan gum 0.2% by weight Water 54.6% by weight or more A flowable agent was obtained by wet grinding with a wet ball mill.

Example 2 (Emulsion) 1.2% by weight of compound A 40% by weight of compound B 3% by weight of polyoxyethylene styrylphenyl ether 3% by weight of calcium dodecylbenzenesulfonate 3% by weight of xylene Got

Example 3 (Wettable powder) Compound A 1.2% by weight Compound B 40% by weight Sodium ligninsulfonate 3% by weight Sodium dialkylnaphthalenesulfonate 3% by weight Kaolin 52.8% by weight The above components were mixed and pulverized. A wettable powder was obtained.

Example 4 (Granule) Compound A 0.6% by weight Compound B 20% by weight Sodium ligninsulfonate 3% by weight Sodium alkylnaphthalenesulfonate 1% by weight Bentonite 30% by weight Talc 45.4% by weight or more After pulverization, the granules were granulated by a usual method with a granulator and dried to obtain granules.

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

Test Example 1 (Effect of soil mixing treatment to reduce the amount of drug) Area 0.2
The paddy soil and the chemical fertilizer were put in a 5 m ² concrete pot, an appropriate amount of water was added, and the mixture was thoroughly stirred to make a paddy field. Two 2-leaf stage paddy rice seedlings, which had been grown in the greenhouse in advance, were transplanted to each of these 3 plants per pot, and seeds of Novier, Konagi, Azena, and Firefly were sown in fixed amounts, and the tubers of Cyperus japonicus were fixed. Planted in quantities.

Four days before transplantation, a predetermined amount of the test compound was treated with a flowable agent (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.

[0032]

[Table 1]

In the table, the herbicidal effect and the degree of phytotoxicity against paddy rice are shown in Table 2 below.
As shown in the table, each grade is represented by 6 grades from "0" to "5" and 6 grades from "-" to "x".

[0034]

[Table 2]

Test Example 2 (Effect of reducing the dose of foliage / soil treatment by mixing) Test Example 1
A test pot was prepared by the same method as described in (3) above, and 3 days after transplantation, a predetermined amount of the test compound was treated with granules (prepared according to Example 4).

Table 3 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.

[0037]

[Table 3]

In the table, the herbicidal effect and the degree of phytotoxicity to paddy rice are shown in Table 2 of the above herbicidal effect and the degree of phytotoxicity to paddy rice.
As shown in the table, each grade is represented by 6 grades from "0" to "5" and 6 grades from "-" to "x".

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.

As shown by the results of Test Examples 1 and 2 above, the composition of the present invention can effectively control various weeds with a low dose which is unprecedented in herbicides. It is extremely promising as a material for use.

[0041]

As is apparent from the above test examples, the composition of the present invention has high herbicidal activity against a wide range of weeds such as Nobie, Azena, Kokonagi, Firefly, Mizugaya, etc. in such a low dose that each compound alone cannot achieve it. It is effective and has no phytotoxicity to paddy rice.

The time of use can be arbitrarily selected from a wide range from before transplantation of rice to early growth of weeds (about 20 days after transplantation). The highest herbicidal effect can be obtained when the treatment is performed about 10 days later.

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 unexpected from the herbicidal properties of each of them. It shows the effect.

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 safe to the environment and farmers, and can be said to be a herbicide that meets the needs of the times.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yukiko Oe Inventor Yukiko Oe 8-3-1 Chuo, Ami-machi, Inashiki-gun, Ibaraki Rhone Poulin Petrochemical Agro Co., Ltd. Ami Research Laboratory (72) Inventor Masatoshi Yokoyama Inashiki-gun, Ibaraki Prefecture 8-3-1 Chuo, Ami Town Rhone Poulin Petrochemical Agro Co., Ltd. Ami Research Laboratory

Claims (1)

[Claims] 1. (A) The following formula (I): 3- [2,4-dichloro-5- (2-propynyloxy) phenyl] -5- (1,1-dimethylethyl) -1,3,4-oxadiazol-2 (3H)-represented by When turned on, (B) the following formula II: 1- (α, α-dimethylbenzyl) -3-p represented by
-A herbicide composition for paddy fields containing tolylurea as an active ingredient.