KR920002305B1 - Herbicide composition - Google Patents

Abstract

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Description

Herbicide composition

In FIG. 1, based on the herbicidal activity against Cyperus serotinus of Tables 3 and 4, the dose required for 90% inhibition was prepared by the iso effect method. The vertical axis represents the amount (g / a) of brobutide and the horizontal axis represents the amount (g / a) of compound (I). The dashed line represents the line in case of additive effect, and the solid line represents the equal effect line of 90% of the estimated growth inhibition rate.

The present invention is formula (I)-

A herbicide composition comprising pyrazolesulfonyl urea and N- (α, α-dimethylbenzyl) -α-bromo-tert-butylacetamide (hereinafter referred to as bromobutydra) represented by It is about.

In the long years of research and development of herbicides, various kinds of medicines have been put into practical use, and these herbicides have contributed to the improvement of weed control operations and the improvement of the production of agricultural crops. Even today, there is a need for the development of a new drug having more excellent herbicidal properties. Especially, as a horticultural herbicide, only weeds can be selectively and controlled in low doses without harming cultivated crops. Preferably, existing medications do not necessarily meet this requirement.

The compound represented by formula (I) exhibits excellent herbicidal effect in a low dose compared to conventional herbicides, and also has high safety against rice. In addition, it exhibits not only a haze effect on the annual rice and weeds and the annual green leaf weeds but also a strong effect on the perennial weeds, and its usefulness is great.

Bromobutide, on the other hand, has a high effect on Cyperu Stp, such as Scirpus juncoides, and also has excellent effects on Echinochlos Crussgalli, Monochoria vaginalis and the like, and is a useful herbicide. However, perennial Cyperus Stp. Arising from broadleaf weeds and tubers. And weeds such as Cyperus Serotinus, Eleocharis Kuroguwai, etc., it is difficult to expect full effects and improvements are desired.

MEANS TO SOLVE THE PROBLEM As a result of carrying out research to increase the herbicidal effect of the compound represented by Formula (I), when the bromobutide is mix | blended with the compound represented by Formula (I), each herbicidal effect is simply additive ( The present invention was completed by finding a synergistic herbicidal effect as well as a synergistic herbicidal effect, which is an excellent admixture that combines the safety of a much higher crop and the herbicidal effect against harmful weeds compared to conventionally known admixtures. . This makes it possible to control a wide range of weeds at low doses without harming rice, and the usefulness of the present invention is extremely high.

Moreover, the herbicide composition of the present invention has an effect even if it is treated before and after germination of weeds, and a high effect can also be obtained by soil treatment, stem leaf and soil treatment. It is also useful for various grains other than rice, and can be applied to the control of various weeds in non-agricultural areas such as fields and playgrounds, vacant lands, forest lands, tank areas, and street roads for farms such as other soils and orchards. It shows a great economic effect in the control.

Although the composition by this invention originates also in the relative activity of each component, generally, 0.001-10 weight part of mixtures represented by Formula (I) per 1 weight part of bromobutide. The amount of mixture to be applied depends on a number of factors, such as the specific plant to be prevented from growing, but in general amounts of 0.001 to 1 kg / ha are usually suitable.

When the composition of the present invention is used as a herbicide, it is usually mixed with a solid carrier, a liquid carrier, a surfactant, and other preparation aids, and then formulated with an emulsion, a hydrating agent, a suspending agent, and the like.

These formulations contain 1 to 90% by weight, preferably 2 to 80% by weight, of the total amount of the active ingredients.

Examples of solid carriers include kaolin clay, attapulgite clay, bendonite, acidic clay, calcium carbonate, pyrophyllite, talc, diatomaceous earth, calcite, walnut flour, urine, ammonium sulfate, synthetic silicon oxide, etc. And fine powders or particulate matter. Examples of the liquid carrier include aromatic hydrocarbons such as xylene and methylnaphthalene, alcohols such as isopropanol, ethylene glycol and cellosolve, ketones such as acetone cyclohexanone and isophorone, soybean oil and cottonseed oil. Vegetable oils, such as dimethyl sulfoxide, acetonitrile, and water, are mentioned.

Surfactants used for emulsification, dispersion, wet pressing, etc. include anionic surfactants such as alkyl sulfates, alkylaryl sulfonates, dialkyl sulfosuccinates, polyoxyethylene alkylaryl ether phosphate ester salts, polyoxyethylene alkyl ethers, Nonionic surfactants, such as a polyoxyethylene polyoxypropylene block copolymer and a sorbitan fatty acid ester, etc. are mentioned. Examples of other auxiliary additives for preparation include lignin sulfonate, alginate, polyvinyl alcohol, gum arabic, CMC (carboxymethyl cellulose), PAP (acidic phosphate isopropyl), and the like.

The herbicidal composition of the present invention may be blended with another herbicide in order to obtain more excellent herbicidal effect. As such herbicides, for example, 2,4,6-trichlorophenyl-4'-nitrophenyl ether, 2,4-dichlorophenyl-3'-methoxycarbonyl-4'-nitrophenyl ether, 2,4 -Dichlorophenyl-3'-methoxy-4'-nitrolophenylether, S- (4-chlorobenzyl) -N, N-diethylthiol carbamate, S-ethyl-N, N-hexamethylenethiolka Abamate, S-benzyl-N- (1,2-dimethylpropyl) -N-ethyl-thiolcarbamate, S- (1-methyl-1-phenylethyl) -piperidine-1-carbothioate , 2-chloro-2 ', 6'-diethyl-N- (butoxymethyl) acetanilide, 2-chloro-2', 6'-diethyl-N- (2-propoxyethyl) acet anilide, N -[2 '-(3'-methoxy) -thienylmethyl] -N-chloroacet-2,6-dimethylanilide, 2', 3'-dichloro-4-ethoxymethoxybenz anilide, 2-benzo Thiazol-2-yloxy-N-methylacet anilide, 3,7-dichloro-8-quinolinecarboxylic acid, 0- (3-tert-butylphenyl) -N- (6-methoxy-2-pyridyl)- N-methylthio carbaate, 3 (2,4-di Chloro-5-isopropoxyphenyl) -5-tert-butyl-1,3,4-oxadiazole-2 (3H) -one and the like. Although individual activators often exhibit drawbacks in their herbicidal activity, in this case, the herbicidal activity in the case of combining two active compounds is a simple sum of the activities of each of the two compounds. Active), this is called synergism. The activity expected by the specific combination of two herbicides can be calculated as follows. (Calculation of synergistic and antagonistic reactions of the Colby S. R. herbicide combination, see Weed 15, pages 20-22, 1967)

α: inhibition rate when the herbicide A is treated in akg / ha

β: inhibition rate when the herbicide B was treated with the amount of bkg / ha

E: Inhibition rate expected when herbicide A was treated with akg / ha and herbicide B with bkg / ha

In other words, if the actual inhibition rate is greater than the above calculation, it can be said that the activity by the combination is synergistic.

Hereinafter, although an Example demonstrates further more concretely by the Example, the compound, formulation amount, a dosage form, etc. in this invention are not limited only to an Example. In addition, all "parts" mean a weight part.

[Combination example 1: granulation]

Compound (I); 0.07part

Bromobutide; Part Three

Bendonite; Part 20

talc; Part 76.93

After uniformly mixing and grinding the above, a small amount of water is added, the mixture is stirred and kneaded together, granulated by an extrusion granulator, dried and granulated.

[Combination Example 2]

Compound (I); 0.05 parts

Bromobutide; Part 5

Bendonite; Part 20

talc; Part 74.95

After uniformly mixing and grinding the above, a small amount of water is added, the mixture is stirred and kneaded together, granulated by an extrusion granulator, dried and granulated.

[Composition Example 3: Flowable Agent]

Compound (I); 0.4 part

Bromobutide; Part 2.5

Agrisol S-710; Part 10

(Nonionic surfactant: Japan, Kao Atlas Co., Ltd.) Renox 1000; 0.5 part

(Anionic surfactant: Japan, Tohoka Chemical Co., Ltd.) 1% Rhodopolsu; Part 20

(Thickener: Lonpuran Company)

Ethylene glycol; Part 10

water; Part 56.6

The original body is pulverized, mixed with the other components homogeneously to obtain a liquid.

Formulation Example 4: Emulsion

Compound (I); 0.5 part

Bromobutide; Part 6

xylene; Part 72.5

Dimethylformamido; Part 15

Soybean oil; chapter 1

Solfool 2680; Part 5

(The mixture of a nonionic surfactant and anionic surfactant: Japan, Tohoka Chemical Co., Ltd. make) The above is mixed uniformly and is made into an emulsion.

Formulation Example 5: Hydrating Agent

Compound (I); Part Two

Bromobutide; Part 24

Di-crite A; Part 64

(Kaolin-based clay: Japan, D-Clite Kogyo Co., Ltd. product name)

Solfool 5039; Part Two

(Alkyl ether sulfate: Japan, Tohoka Chemical Co., Ltd.)

Solfool 5050; Part Two

(50% diluent of dioctyl sulfosuccinic acid white carbon: Japan, Tohoka Chemical Co., Ltd.)

Soybean oil; Part Two

Carplex (antifreeze); Part 4

(White Carbon: Japan, Shionogi Seiyaku Co., Ltd.)

The above is mixed and pulverized uniformly to obtain a hydrate.

Test Example 1: Herbicide Effect Test in Freshwater Condition An alluvial soil is placed in a Wagner pot of 1/5000 ar, mixed with water to obtain a fresh water condition of 4 cm.

Seeds of Echinochloa oryzicola broad weeds (monochoria, Lindernia Procumbens, Rotala indica) were mixed in the above-mentioned ports, and the tubers of Sagittarria pygmaea and Cyperus Serotinus were wounded. The pots were placed in a greenhouse at 25 to 30 ° C., and the plants were grown, and on the 10th day after sowing, the chemical diluent was dropwise treated with a graduated pipette so that Echinochloa oryzicola had a predetermined amount on the surface at the time of 1.5 side period.

At 3 weeks after dropping, the herbicidal effects on the various weeds were examined according to the following criteria. The results of the herbicidal effect test of single herb are shown in the second table when the two herbicides are mixed in the first table.

Criteria

5: 90% or more kill rate (nearly complete test)

4: 70-89% of the herbicide rate

3: 40-69% of the herbicide rate

2: 20 ~ 39% kill rate

1: 5 ~ 19% of the herbicide-5% or less of the herbicide (almost no effect)

TABLE 1

TABLE 2

Test Example 2: Synergistic effect test on Cyperus Serotinus The soil of Neubauer Fort-Enon of 1 / 1000are was filled with rice paddy, and the tuber of flet sedge was planted. On the third day of planting, 1 ml of the drug diluent of a predetermined concentration was added dropwise to the water in a scale pipette. After 30 days of incubation in the greenhouse, the ground portion biomass of Cyperus Serotinus was measured, and the inhibition rate was determined by the following method.

The test result of a single agent was shown to the 3rd table, and the test result at the time of mixing two drugs is shown to the 4th table.

TABLE 3

Inhibition rate of biomass on the ground of flat sedge (single)

TABLE 4

Inhibition rate of ground weight biomass of flat sedge (mixed)

In a table | surface, an expectation value shows the calculated value calculated | required from the said Colbay's formula. As mentioned above, the inhibition rate of the ground part bio weight exceeded expectations.

The synergistic effect of the composition of the present invention is more clearly shown by the solution by the equal effect line method.

In other words, as a composition consisting of different mixture ratios of herbicide A and herbicide B, several scores showing 90% growth inhibition rate and shown as shown in FIG. 1 show synergistic effects, additive effects, and antagonistic effects. (Japan, Fukami-jungichi, Uesugiyasuhiko, Izukako-jo, Tomisawa Chooji-ro, Pesticides, Volume 8, First Herb, First Edition, pages 109-111 (1981), published by Soft Science, Inc.) ). In other words, when the equal effect line is below the additive effect line, the synergistic effect is obtained. As shown in FIG. 1, it is clearly shown that the isoline of the composition of the present invention is below the additive effect line and shows a true synergistic effect.

Claims (1)

Formula (I):

A herbicide composition comprising 0.001 to 10 parts by weight of pyrazolesulfonyl urea and 1 part by weight of N- (α, α-dimethylbenzyl) -α-bromo-tert-butylacetamide as an active ingredient.

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