JPH0597611A - Herbicide composition for upland field - Google Patents

Abstract

PURPOSE:To provide a herbicide composition having expanded herbicidal spectrum and exhibiting sufficient herbicidal effect at a low rate of application. CONSTITUTION:The objective herbicide composition for upland field contains methyl O-methoxy-carbonylmethyl-5-(2,4-dichloro-3-methylphenoxy)-2- nitrobenzohydroxymate and 2, 4-dichlorophenoxyacetic acid 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 fields which is safe for crops and effectively controls field weeds when applied to crops such as corn and wheat. ..

[0002]

2. Description of the Related Art A wide variety of herbicides have been developed through many years of research and development of herbicides. These herbicides are important for improving agricultural productivity such as protection of useful crops from weed damage and labor saving of agricultural work. It is now an indispensable material. However, even at present, it has a better herbicidal performance, that is, it does not cause phytotoxicity to cultivated crops, has a broad herbicidal spectrum, and it is desired to develop an effective herbicide at a lower dose. However, existing herbicides do not always completely meet such requirements.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention 2,4-Dichlorophenoxyacetic acid and its salts or their esters (these are sometimes referred to as "compound 2") can be used as a single agent for cultivated crops such as corn. It is a widely used herbicide (see U.S. Pat. No. 3,284,365), but when used in foliar treatment, only a mixture with a herbicide spectrum has been put into practical use. Therefore, improvement is strongly desired.

[0004]

The present inventors have developed compound 2
Overcoming the shortcomings of the
In addition, he has made extensive research efforts for the purpose of developing a herbicide capable of exhibiting a sufficient herbicidal effect with a low dose. As a result, it is possible to selectively control a wide range of weeds in a field 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 herbicide composition of the present invention was increased synergistically as compared with the above-mentioned, and therefore the application was possible at a low dose, and the herbicidal spectrum was further expanded, and the herbicidal composition of the present invention was completed.

The present invention relates to methyl O-methoxy-carbonylmethyl-5- (2,4-dichloro-3-methylphenoxy) -2-nitrobenzohydroxymate (sometimes referred to as "compound 1"). The present invention provides a herbicide composition for upland field, which comprises, as an active ingredient, at least one selected from 2,4-dichlorophenoxyacetic acid and salts or esters thereof.

(Detailed Description) Compound 1 and compound 2 used as the active ingredients of the composition of the present invention are known herbicides which are widely used. That is, Compound 1 is a diphenyl ether type herbicide disclosed in JP-A-63-215605. Compound 2 is also disclosed in US Pat. No. 3,284,
It is a phenoxyacetic acid type herbicide disclosed in No. 365. Specific preferred examples of compound 2 include (1) 2,4-dichlorophenoxyacetic acid (2) 2,4-dichlorophenoxyacetic acid sodium salt (3) 2.4-dichlorophenoxyacetic acid 2-humanroxyethylammonium (4) 2,4-Dichlorophenoxyacetate bis (2-hydroxyethylammonium) (5) 2,4-Dichlorophenoxyacetate tris (2-hydroxyethylammonium) (6) 2,4-Dichlorophenoxyacetate isopropyl (7) 2,4 Butyl dichlorophenoxyacetate (8) isooctyl 2,4-dichlorophenoxyacetate (9) 2-butoxyethyl 2,4-dichlorophenoxyacetate and the like.

In the composition of the present invention, two active ingredients (Compound 1 and Compound 2) can be mixed in a wide range of ratios, but usually, Compound 1 is added to 1 part by weight of Compound 2.
04 to 5000 parts by weight, preferably 2 to 100 parts by weight of compound 2 with respect to 1 part by weight of compound 1.

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. Examples of solid carriers that can be used in the preparation include kaolinite group, montmorillonite group, crelite group represented by illite group or polygloskite group, specifically, pyrophyllite, attapulgite, sepiolite, kaolinite, bentonite, saponite, Bar
Miculite, mica, talc; other inorganic substances,
Gypsum, calcium carbonate, dolomite, diatomaceous earth, calcite, magnesium lime, apatite, zeolite, silicic acid anhydride, synthetic calcium silicate; soybean powder, tobacco flour, walnut flour, wheat flour, wood flour, starch, crystalline cellulosics Synthetic organic compounds such as coumarone resins, petroleum resins, alkyd resins, polyvinyl chloride, polyalkylene glycols, ketone resins, ester gums, cobal gums, dammal gums; carnauba wax;
Examples thereof include waxes such as 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, isophorone; ethyl acetate, amyl acetate, ethylene glycol acetate, diethylene glycol -Esters such as luacetate, dibutyl maleate and diethyl succinate;
Alcohols such as n-hexanol, ethylene glycol, diethylene glycol, cyclohexanol and benzyl alcohol; ethylene glycol ethyl ether;
Examples thereof 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; isooctylphenol, Compounds obtained by polymerizing addition of ethylene oxide to alkylphenols such as nonylphenol; Compounds obtained by polymerizing addition of ethyleneoxide to alkylnaphthols such as butylnaphthol and octylnaphthol; palmitic acid, stearic acid, oleic acid, etc. Compounds obtained by polymerizing addition of ethylene oxide to higher fatty acids; Compounds obtained by polymerizing addition of ethylene oxide to amines such as dodecylamine and stearic acid amide; Polymerization addition of higher fatty acid esters of polyhydric alcohol such as sorbitan and ethylene oxide thereto Compound: Ethylene 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 salt; sulfosuccinic acid dioctyl ester sodium, 2-ethylhexene sulphonate sodium and the like. Alkyl sulfonates include aryl sulfonates such as sodium isopropyl naphthalene sulfonate, sodium methylenebisnaphthalene sulfonate, sodium lignin sulfonate, and sodium dodecylbenzene sulfonate.
Further, the composition of the present invention, in order to improve the performance of the formulation, enhance the herbicidal effect, casein, gelatin, albumin,
Glue, lignin sulfonate, alginate, gum arabic, carboxymethylcellulose, methylcellulose
, Hydroxyethyl cellulose, polyvinyl aldo-
It is also possible to use a high molecular compound such as silicone, polyvinylpyrrolidone, or polysaccharide, or other auxiliary agent.

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 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 contained in an amount of 1 to 90% by weight, and the balance is a solid carrier,
It is 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 contained in an amount of 0.01 to 35% by weight, and the balance is 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 10% by weight is contained therein.
A weight% dispersion wetting agent is contained, the balance is water, and a protective colloid agent, an antiseptic agent, an antifoaming agent and the like are added if necessary.

The suitable 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, a range of 0.05 to 5.2 kg, preferably 0.21 to 1.1 kg per hectare, based on the total amount of active ingredients, is suitable. Furthermore, 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. In addition, when sprayed, it can be used in combination with other various insecticides, fungicides, plant growth regulators, herbicides, fertilizers and other chemicals, if necessary.

[0015]

EXAMPLES The present invention will be specifically described below with reference to examples. Example 1 (Wettable powder) Compound 1 5 parts by weight Compound 2 (2,4-dichlorophenoxyacetic acid) 25 parts by weight Sodium ligninsulfonate 3 parts by weight Sodium lauryl sulfate 2 parts by weight Kaolin clay 65 parts by weight The above are mixed. It was pulverized to make it uniform, and a wettable powder was obtained.

Example 2 (flowable agent) Compound 1 5 parts by weight Compound 2 (2,4-dichlorophenoxyacetic acid) 25 parts by weight Polyoxyethylene lauryl ether 2 parts by weight Lauryl sulfate sodium salt 2 parts by weight Zansan gum 2 parts by weight Water 65.8 parts by weight The above components were 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 Pot Test (Summer Crop Treatment) A corn seed and a summer weed seed shown in Table 2 were sown in fixed amounts in a plastic cup having a diameter of 7 cm and a depth of 10 cm.
The soil was covered with a thickness of 5 mm, and the cultivation was controlled for 20 days at an appropriate temperature and humidity. For the drug treatment, the formulation of Example 2 was used as a trial, and diluted with water so that the amounts of the respective active ingredients shown in Table 2 were adjusted,
4.5 ml per section was uniformly sprayed on the foliage of the plant.
Twenty days after the chemical treatment, the herbicidal effect on each weed and the degree of phytotoxicity to corn were determined according to the "evaluation criteria" in Table 1, and the results are shown in Table 2. Also, for comparison, the same evaluation was performed when Compound 1 and Compound 2 were used alone.

[0018]

[Table 1]

[0019]

[Table 2]

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

Test Example 2 Field test (Summer crop field foliage treatment) In the field, seeds of corn seeds (Roki-Bandam) suitable amount of 50 kg per hectare, velvetleaf, Onami fir, Aobiyu, Morning glory, Scots flesh, White-billed Datura seeds are sown. And fractionate into 2m x 5m test area,
After the day, drug treatment was performed. For the drug treatment, the formulation of Example 2 was used as a test, diluted with water so that the respective amounts of the active ingredients shown in Table 2 were obtained, and 500 ml per section was uniformly sprayed. After 30 days from the chemical treatment, the herbicidal effect on each weed and the degree of phytotoxicity to corn were discriminated according to the criteria in Table 1, and the results are shown in Table 3. Also, for comparison, the same evaluation was performed when Compound 1 and Compound 2 were used alone.

[0022]

[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.

[0024]

As is clear from the above test examples, the composition of the present invention exhibits a high effect on summer weeds and winter weeds at a low dose which cannot be achieved by each compound alone, and has no effect on crops. Does not cause phytotoxicity. 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,
The herbicidal properties of each of them show an unexpected effect. Therefore, compared to conventional herbicides, the amount of active ingredient required is extremely small, so that the herbicide is highly safe for the environment and farmers and meets the needs of the times.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Miki Furumine 8-3-1 Chuo, Ami-machi, Inashiki-gun, Ibaraki Prefecture Mitsubishi Petrochemical Co., Ltd. Tsukuba Research Institute

Claims (1)

[Claims] 1. Methyl O-methoxy-carbonylmethyl-5- (2,4-dichloro-3-methylphenoxy)
A herbicide composition for upland field, which contains as an active ingredient, 2-nitrobenzohydroxymate and at least one selected from 2,4-dichlorophenoxyacetic acid and salts or esters thereof.