JPS60214703A - Herbicidal composition - Google Patents

Abstract

PURPOSE:The titled composition withering various kinds of weeds in question with a small amount used, showing safety to paddy rice plants, a wide proper application width, and effect durability, obtained by blending 2,4,6-trichlorophenyl-4'-nitrophenyl ether with a pyrazole derivative. CONSTITUTION:2,4,6-Trichlorophenyl-4'-nitrophenyl ether is blended with a pyrazole derivative shown by the formula (X is 4-toluenesulfonyl group). In the blending ratio, 1pt.wt. of the former compound is blended with 0.2-5pts.wt. compound shown by the formula. The blend itself may be applied, but it is used in the form of dust, granule, wettable powder, etc. In case of dust, for example, it contains usually 1-25pts.wt. compounds of active ingredients, and the rest is a solid carrier. Wettable powder, for example, comprises 25-90pts.wt. compounds of active ingredients, the rest of a solid carrier, a dispersible wetting agent, and, if necessary, a protective colloid agent, etc. Dust comprises 1-35pts.wt. compounds of active ingredients and the rest of a solid carrier.

Description

DETAILED DESCRIPTION OF THE INVENTION Invention B, 2.4.6-trichlorophenyl-4'-
Nitrophenyl ether (A) H3 (wherein) X represents a 4-toluenesulfonyl group. ] A mixture characterized by being blended with a pyrazole derivative (B) represented by the following formula to bring about a box power effect that is far more remarkable than could be expected from a single application, and to be able to kill many kinds of problem weeds with a low application amount. It concerns rice field herbicides.

At present, a large number of herbicides have been put to practical use as herbicides for paddy fields, and are widely used as single agents and mixtures. . However, there are many types of paddy weeds, and although there are many herbicides that are effective against annual weeds, there are very few herbicides that are effective against perennial weeds. As a result, the number of perennial weeds has increased, and there is a strong need to control them.

Perennial weeds generally grow vigorously, have a long emergence period, and are a type of harmful grass. (2) Therefore, herbicides are desired to have properties with a wide herbicidal spectrum that can kill many types of weeds.

In addition, in recent years, mechanization and earlier transplantation of rice cultivation have become widespread, providing a more suitable place for weeds to grow than ever before, and complete weed control can be expected with multiple herbicide applications. tend not to be able to do so. For this reason, the same or different herbicides are used several times (repeatedly), but such repeated use not only requires a great deal of labor, but also causes undesirable problems such as phytotoxicity of paddy rice and soil residue due to large amounts of application. It raises an issue.

In order to improve these problems of conventional herbicides, the present inventors aimed to completely control all weeds by multiple spraying, have a high degree of safety for paddy rice, and have extremely low toxicity to humans and animals. As a result of continuing to search for a safe herbicide with a low herbicide, the present invention was completed based on the finding that a sophisticated herbicide that improved the problem of stiffness could be obtained by combining two types of active ingredients.

That is, the present invention is a herbicide known as a herbicide for paddy fields (7) 2
．． This is a mixture of 4.6-trichlorophenyl-4'-nitrophenyl ether (A) and a pyrazole compound known in JP-A-50-12 [1830].

To explain the present invention in detail, (A), which is one of the components of the herbicidal composition, is highly effective against grasshoppers, has high selectivity between rice and barnyard grass, and is safe for rice. Highly sexual. It is also active against broad-leaved weeds and perennial weeds that have become a problem in recent years, such as porcupine and scallops, when treated in the early stages of growth, but the effect becomes weaker as growth progresses.

On the other hand, the dozol compound (B) does not cause any phytotoxicity to paddy rice in paddy fields, and is also effective against annual grass weeds, broad-leaved weeds, and perennial weeds such as Cyperus spp. However, if the weeds are treated with chemicals when they have grown to a certain extent, the effect will be reduced, and the effect on wild grasses in particular will be insufficient.

However, as a result of applying both in combination and examining their herbicidal effects and phytotoxicity, we were surprised to find that the range of herbicidal effects was expanded beyond the scope of application obtained with each single agent; It has been found that it is effective in expanding the range of suitable spraying periods for grasses, Cyperaceae, general broad-leaved weeds, and general perennial weeds such as fireweed, cyperus, and paddy rice without compromising their safety.

In addition, this herbicide exhibits its effect sufficiently when mixed at a much lower dose than when used alone, and its herbicidal efficacy is increased to the extent that it is used as a treatment agent, and its efficacy is sustained. Sex lasts a long time.

The mixture shown in the present invention is a novel combination that has not been described in any literature, and of course there are no literature that mentions its unique potency enhancement. The synergistic effect related to the present invention was observed in a wide range of mixing ratios1.
The compound (B) represented by 02~! A useful herbicide can be prepared by mixing parts by weight. The herbicide of the present invention thus completed can be highly effective when treated in soil before and after weed germination.

The mixture of the present invention may be sprayed as the raw material itself, or 1.
Mixed with a carrier and other adjuvants as necessary, the preparation forms commonly used as herbicides, such as powders, coarse powders, fine granules, granules, wettable powders, emulsions, aqueous solutions, aqueous solutions, It is prepared and used as an oil suspension.

Suitable solid carriers for use in preparing the herbicides of the present invention include clays represented by the kaolinite group, the montmorillonite group, or the athanoid group, talc, mica, pyrophyllite, pumice, verminite, etc. light, gypsum,
Inorganic substances such as calcium carbonate, dolomite, diatomaceous earth, magnesium lime, apatite, zeolite, silicic anhydride, synthetic calcium silicate, soybean flour, tobacco flour, walnut flour, wheat flour, wood flour, starch, crystalline cellulose, etc. vegetable organic substances, coumaron resin, petroleum resin, alkyd resin,
Synthetic compounds such as polyvinyl chloride, polyalkylene glycol, ketone resin) ester gum, copal gum, and dammar gum include natural polymer compounds, carnano (wax, waxes such as rattan wax, and urea).

Suitable liquid carriers include kerosene and ore. (L) refers to naphthenic hydrocarbons, aromatic hydrocarbons such as benzene, toluene, xylene, ethylbenzene, cumene, methylnaphthalene, carbon tetrachloride, chloroform, trichloroethylene, Chlorinated hydrocarbons such as monochlorobenzene and 0-chlorotoluene, ethers such as dioxane and tetrahydrofuran, ketones such as acetone, methyl ethyl ketone, diisobutyl ketone, cyclohexanone, acetophenone, and isophorone, ethyl acetate, amyl acetate, ethylene glycol acetate, Esters such as diethylene glycol acetate, dibutyl maleate, diethyl succinate, alcohols such as methanol, n-hexanol, ethylene glycol, diethylene glycol, fuclohexanol, benzyl alcohol, ethylene glycol ethyl ether, ethylene glycol phenyl ether, diethylene glycol ethyl Ether alcohols such as ether, diethylene glycol butyl ether,
Polar solvents such as dimethylformamide and dimethyl sulfoxide, and b include water and the like.

Surfactants used for purposes such as emulsification, dispersion, wetting, spreading, binding, disintegration control, active ingredient stabilization, fluidity improvement, and rust prevention are nonionic, anionic, cationic, and Although any zwitterionic species can be used, non-ionic and/or anionic species can usually be used.

Suitable nonionic surfactants include those prepared by polymerizing and adding ethylene oxide to higher alcohols such as lauryl alcohol, stearyl alcohol, and oleyl alcohol, and those obtained by polymerizing and adding ethylene oxide to alkylphenols such as inoctylphenol and nonylphenol. , products obtained by polymerizing and adding ethylene oxide to alkylnaphthols such as butylnaphthol and octylnaphthol, products obtained by polymerizing and adding ethylene oxide to higher fatty acids such as valmitic acid, stearic acid, and oleic acid, stearyl phosphoric acid, di-7-acrylic phosphoric acid Polymerization and addition of ethylene oxide to mono- and dialkyl phosphoric acids such as, etc., polymerization and addition of ethylene oxide to amines such as dodecylamine and stearic acid amide, higher fatty acid esters of polyhydric alcohols such as sorbitan, and polymerization of ethylene oxide to them. There are many examples, such as those that have been added with ethylene oxide and those that have been polymerized and added with ethylene oxide and propylene oxide. Suitable external anionic surfactants include, for example, sodium lauryl sulfate, alkyl sulfate salts such as oleyl alcohol sulfate amine salts, sulfonic acid diocthyl ester sodium, 2
Examples include alkyl sulfonates such as sodium ethylhegysene sulfonate, sodium isopropylnaphthalene sulfonate, methylene bisnaphthalene sulfonate, aryl sulfonates such as sodium lignosulfonate, and sodium dodecylbenzenesulfonate.

Furthermore, the herbicide of the present invention may be used in combination with polymeric compounds such as tin, albumin, glue, sodium alginate, carboxydimethylcellulose, methylcellulose, hydroxyethyl cellulose, polyvinyl alcohol, and other adjuvants to improve the properties of the formulation. You can also.

The above-mentioned carriers and various auxiliary agents are used individually or in combination depending on the purpose, taking into account the dosage form of the preparation, the application situation, etc.

Powders, for example, usually contain from 1 to 25 parts by weight of the active ingredient compound, with the remainder being a solid carrier.

Irrigation agents, for example, usually contain 25 to 9
The remaining part is a solid carrier, a dispersing wetting agent, and optionally a protective colloid agent, a thixotropic agent, an antifoaming agent, etc.

Granules, for example, usually contain 1 to 35 parts by weight of the active ingredient compound, with the remainder being mostly solid carrier. Is the active ingredient compound uniformly mixed with the solid carrier, or is it coated on the surface of the solid carrier?
h The emulsion H is about 0.2 fr to 1.5 W. The emulsion usually contains, for example, 5 to 30 parts by weight of the active ingredient compound, and about 5 to 20 parts by weight of the emulsifier. The remainder is a liquid carrier, with rust inhibitors added as needed.

Examples of formulations of this herbicide are shown below.

Formulation Example 1 20 parts by weight of compound (B), 20 parts by weight of compound (6), 2.5 parts by weight of dodecylbenzenesulfonate, 2.5 parts by weight of lignosulfonate and ±55 parts by weight of diatom were thoroughly ground and mixed. to obtain irrigation agents.

Formulation example 2 Compound (B) 15 parts by weight, Compound (A) 5 parts by weight, Emulsifier Tsurupol EIM100 (Toho Chemical registered trademark) 15
Parts by weight and 65 parts by weight of xylene are thoroughly mixed to obtain an emulsion.

Formulation Example 3 5 parts by weight of Compound (B), 3 parts by weight of Compound (A), 3 parts by weight of white carbon, 5 parts by weight of lignin sulfonate, and 84 parts by weight of clay were thoroughly ground and mixed, water was added, and the mixture was thoroughly kneaded. After granulation and drying, granules are obtained.

Formulation Example 4: 40 parts by weight of bentonite, 5 parts by weight of lignin sulfonate, and 55 parts by weight of clay are pulverized and mixed, water is added, mixed, and granulated and dried to produce granules containing no active ingredient. Add 2 parts by weight of compound ← to 90 parts by weight of this granular material, and add compound (B) to 90 parts by weight.
Granules are obtained by impregnating 8 parts by weight of.

Next, in order to more specifically demonstrate the usefulness of the present invention, a test example will be given and explained.

Test Example 1 A polyethylene pot with an inner diameter of atX was filled with paddy soil, and Japanese millet was grown in the paddy field, and the flooded soil was treated with a predetermined amount of each drug formulated into an irrigation agent during the first leaf stage of barnyard grass. The pot treatment area ratio was calculated at 25-30°C. The results are shown in Table 1.

Table 1 a Based on the test results in the table above, draw the dose-response curves for Agent B or Agent A when the dose of Agent A or Agent B is held constant, and determine whether the herbicidal agent is 110% herbicidal or not. Find several quantities, and based on this, 9
The iso-effect line for 0% weed killing and 11 il of fruit thinning are below the line for additive effect, proving that there is a synergistic effect.

Test Example 2 Paddy soil was filled with SKf of paddy soil. Water was poured into a Wagner pot of 175,000 a to create a paddy field. In this pot, seeds of broad-leaved weeds such as Japanese millet, bulrush, and broad-leaved weeds such as Japanese azalea, azalea, and staghorn grass were sown. ! I planted tubers of Urikawa and Cyperus japonica. Furthermore, rice seedlings at the 2.5-leaf stage are transplanted, the pots are placed in a greenhouse at 20-25°C to grow the plants, and a predetermined amount of the chemical is hydrated at the 18th post-sowing stage, when the barnyard grass is at the 1-leaf stage. Formulated into a drug, diluted with water, 10cc per pot
After 60 years of treatment, the plants were grown in a greenhouse, and the herbicidal effect was investigated on the 25th day after treatment. The herbicidal effect was expressed as a number from 0 to 10 as shown below based on the observation of the weed suppression rate, the degree of whitening, etc. The results are shown in Table 2.

Weed suppression rate 0:0~j 2:20~29 4: 40~49 8: 80~895; 50
~ss s: so ~996: 60~69 1
0: 100 (Complete death) y: 70-19 The numbers in parentheses in Table 2 are the expected weed suppression values (Pg) of the combination agent calculated by the following formula of C0tby.

Pg=Pa+Pb(10-Pa)/10(Pa, P
b: Weed suppression value when applied as a single agent based on the dosage of each component present in the combination product) As a result, the actual value (PC) of the weed suppression value of the combination product was larger than the predicted value (Pg). It is proven that there is a synergistic effect.

Test Example 3 ゛ Using a paddy field with clay loam and water reduction method of 1 to 2σ/day, rice seedlings at the 2nd to 3rd leaf stage were transplanted on May 10th, and a predetermined amount of granules were placed in the third pewter after transplanting. The ratio of drug to non-treated plots was calculated. Chemical damage to rice was determined by observation. The test area was 6 m2 per area, and the test was conducted in two consecutive sessions. The results are shown in Table 3.

The numbers in parentheses in the table are the expected values (Q, Ie) of the remaining grass amount of the compounding agent versus the untreated ratio calculated by the following formula of 007by.

Q, B = Qa-CLb/10G (Qa, Q, b
: The amount of remaining grass when applying a single agent of each component present in the combination product to the untreated ratio) As a result, the actual value (Qa) of the amount of remaining grass of the combination product to the untreated ratio
Fi is smaller than the expected value (Qg), proving that there is a synergistic effect.

The isoeffect line is shown.

Part A: 2.4.6-dolychlorophenyl-4'-nitrophenyl ether Part B: 4-(2,4-dichlorobenzoyl)-1,
3-dimethyl-5-(4-toluenesulfonyloxy)
Pyrazole C

Claims (1)

[Claims] 2,4.6-trichlorophenyl-4'-nitrophenyl ether, H3 [wherein X represents a 4-toluenesulfonyl group]; A paddy field herbicide characterized by being mixed with a pyrazole derivative represented by ].