JPH05117118A - Herbicidal composition - Google Patents

Abstract

PURPOSE:To provide a safe herbicidal composition, having a wide herbicidal spectrum including both of annual and perennial weeds in paddy field and remarkably reduced in phytotoxicity to paddy rice by including a compound expressed by a specific formula as an active ingredient. CONSTITUTION:A herbicidal composition is obtained by blending a compound expressed by formula I (pyributicarb), a compound expressed by formula II (bensulfuron-methyl) and a compound expressed by formula III (daimuron) as active ingredients usually at 1:(0.02-0.2):(0.2-10), preferably 1:(0.05-0.2):(0.5-2) weight ratio of the compounds expressed by formulas I:II:III. The herbicidal composition is capable of exhibiting remarkable synergistic herbicidal effects as compared with those of each single compound or two blended compounds and remarkably relieving phytotoxicity to paddy rice. The composition produces excellent herbicidal effects on annual and perennial weeds in paddy field in the case of treatment before their emergence to the growth period. Thereby, various kinds of weeds in question can be killed with a small amount of chemical.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

[0002]

This invention relates to herbicidal compositions. More specifically, the present invention relates to a herbicidal composition which shows an excellent herbicidal effect against weeds in paddy fields and has significantly reduced chemical damage to paddy rice. More specifically, the present invention relates to a herbicidal composition having a broad herbicidal spectrum including both annual paddy weeds and perennial paddy weeds, and having significantly reduced phytotoxicity to paddy rice.

[0003]

2. Description of the Related Art o-3-tert-Butylphenyl-N- (6-methoxy-2-pyridyl) -N-methylthiocarbamet represented by the following formula (I) used in the present invention has a general name of pyributycarb. Is a known herbicidally active compound. Further, 2- represented by the following formula (II)
[(4,6-Dimethoxypyrimidin-2-yl) aminocarbonyl-aminosulfonylmethyl] benzoic acid methyl ester is a known herbicidally active compound referred to by the generic name bensulfuron-methyl. Furthermore, 1- (α, α-dimethylbenzoyl) -3-represented by the following formula (III)
(P-Tolyl) urea is a known herbicidally active compound known by the general name Daimlon.

To date, a compounding agent of pyributycarb and bensulfuron-methyl has been disclosed in JP-A-63-1125.
No. 03, and the compounding agent of bensulfuron-methyl and dimuron is described in JP-A-61-112003, respectively.

[0005]

[Problems to be Solved by the Invention] Paddy field weeds are of many types, and the germination and growth time of each weed is not uniform. In particular, perennial weeds, which have grown in various areas in recent years and have become a problem to be controlled, have been generated for a long period of time, which is considered to be a major factor that makes control difficult. Therefore, it is very difficult to control all weeds with one spray of herbicide. Therefore, as a herbicide, it is possible to kill many kinds of weeds including annual weeds and perennial weeds by spraying the herbicide once. It is also effective for weeds that have advanced growth, and the weeding effect can be maintained for a certain period of time. The emergence of highly safe drugs for paddy rice is most desired.

[0006] Pyributicarb, when used alone as a paddy field herbicide, is effective against annual rice paddy weeds such as Nobye, Pleurotus cornucopia, N. serrata, and Eryngium japonicum. Absent. However, the effect is insufficient for perennial weeds,
In addition, the treatment of the weeds when they have grown reduces the effect on annual weeds.

Bensulfuron-methyl, when used alone as a paddy herbicide, exerts an excellent herbicidal activity against annual weeds and major perennial weeds by treatment before the emergence of weeds and during the growing season. However, the effect is insufficient for Nobie, and even in the case of ordinary uniform spraying, it causes phytotoxicity that cannot be put to practical use under adverse conditions.

[0008] When used alone as a paddy herbicide, Dimulon exerts a great effect on the pre-emergence annual Cyperaceae weeds and perennial weeds Inu firefly, and ordinary spraying does not cause any phytotoxicity to paddy rice. However,
It does not show any practical effects on annual paddy weeds other than annual Cyperaceae weeds and Inugatarui.

When a combination of pyributicarb and bensulfuron-methyl is used as a paddy field herbicide, it is effective against annual weeds and perennial weeds, but the effect is reduced when the weeds are grown. Furthermore, even in the case of regular uniform spraying to rice, there is a case where it causes chemical damage that cannot be put to practical use under adverse conditions. The combination of bensulfuron-methyl and dimuron is effective for the treatment of annual broad-leaved weeds and some perennial weeds before the emergence of the weeds and during the early stages of the development. .. However, the effect is insufficient for the weeds, which are the main weeds in paddy fields, and the treatment for other weeds at the time when the weeds have grown is insufficient.

In order to improve these problems of conventional herbicides, the present inventors completely control all weeds by spraying once and have a high degree of safety against paddy rice. As a result of continuing the search for safe herbicides with extremely low toxicity, it was found that by combining pyributycarb, bensulfuron-methyl and dimuron, an excellent herbicide that improved these problems can be obtained, and the present invention was completed. did.

[0011]

[Constitution of the invention]

[0012]

The present invention provides the following formula (I):

[0013]

[Chemical 4]

A compound represented by the following formula (II)

[0015]

[Chemical 5]

A compound represented by the following formula (III)

[0017]

[Chemical 6]

A herbicidal composition comprising a compound represented by the formula (1) as an active ingredient.

The blending weight ratio of the three active ingredient compounds according to the present invention is appropriately selected within a range that does not substantially impair the excellent herbicidal effect on paddy field weeds and phytotoxicity of the herbicidal composition of the present invention. However, the combination ratio is usually the formula (I) compound: formula (II) compound: formula (III)
Compound = 1: 0.02-0.2: 0.2-10,
It is preferably 1: 0.05 to 0.2: 0.5 to 2.

The herbicidal composition of the present invention may further contain various auxiliaries, various agricultural chemicals and the like in addition to the compounds of the formula (I), the compound of the formula (II) and the compound of the formula (III). ..

Examples of the auxiliaries include kaolinite, attabargit, montmorillonite, diatomaceous earth, bentonite, talc, pyrophyllite, calcined hirucite, silica, magnesium silicate, ammonium sulfate, magnesium sulfate, calcium sulfate, and phosphate 2. Solid or liquid carriers or diluents such as sodium, starch, water, aliphatic hydrocarbons, aromatic hydrocarbons, alcohols, ethylene glycol, cellosolve and methyl cellosolve: alkyl allyl sulfonate, alkyl sulfate, polyoxyethylene alkyl Emulsifiers, dispersants, wetting agents such as phosphates, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene sorbitan monolaurates, lignin sulfonates, etc .: other auxiliaries It can be exemplified.

The herbicidal composition of the present invention can be prepared according to a method known per se, for example, powder, granules, fine granules, tablets, suspensions, emulsions, wettable powders, concentrated emulsions, aerosols,
Any other desired dosage form may be used. Especially in recent years, the flowable agent developed for the purpose of labor saving is to spray the product undiluted solution directly from the ridge without entering the rice field,
By spraying only on one side of the ridge, the herbicidal effect is exhibited, and the labor of chemical spraying is saved. Furthermore, the development of a formulation to be thrown into a paddy field for the purpose of labor saving is being promoted. The property required for these preparations is that they are not harmful to rice. This is because the medicine may be locally treated as compared with the conventional uniform dispersion of the granule. In this respect,
Since the herbicidal composition of the present invention is a safe herbicidal composition with significantly reduced phytotoxicity, it is very suitable for these formulations.

[0023]

EFFECTS OF THE INVENTION The herbicidal composition of the present invention containing the above-mentioned three compounds has a very remarkable synergistic herbicidal effect as compared with the case where each of them is used alone or when two kinds of them are applied.
Moreover, it is possible to remarkably reduce phytotoxicity to paddy rice.

The herbicidal composition of the present invention exerts an excellent herbicidal effect on the annual weeds and perennial weeds of paddy fields during the treatment from the time of emergence to the growing season, and many kinds of problem weeds at low application rates. Can be killed.

Examples of such annual paddy weeds are:
Examples thereof include Taenia japonica, Pleurotus cornucopiae, Pseudomonas aeruginosa, Pleurotus cornucopiae, P. persica, Azena, Abnomome, Mizukobe, etc. Further, examples of perennial paddy weeds include perennial paddy weeds such as Urikawa, Omodaka, Inuho Tarui, Mizukaya, Matsubai, and Kurogwai.

[0026]

EXAMPLES Hereinafter, the constitution and effects of the herbicidal composition of the present invention will be more specifically illustrated by formulation examples and test examples.

[0027]

[Formulation example]

[0028]

Formulation Example 1 (Wettable powder) Compound (I) 25.0 parts by weight Formula (II) compound 1.5 parts by weight Formula (III) compound 15.0 parts by weight Sodium lignin sulfonate 10.0 parts by weight Kaolinite 47.5 parts by weight Sodium dioctyl sulfosuccinate 1.0 parts by weight After mixing the above components, the diameter of the particles is 5 with a jet mill.
The wettable powder was obtained by pulverizing so as to have a particle size of μ or less and then remixing.

[0029]

Formulation Example 2 (Granule) Compound (I) 2.5 parts by weight Formula (II) compound 0.2 parts by weight Formula (III) compound 2.0 parts by weight Sodium dioctyl sulfosuccinate 0.2 parts by weight Pent Knight 35.0 parts by weight Talc 60.1 parts by weight The above components are mixed and pulverized with a jet mill to give about 20%.
After adding water and kneading, the mixture was extruded with an extrusion granulator having a diameter of about 0.7 mm and cut into a length of about 3 mm to obtain granules.

[0030]

[Formulation Example 3] (Bag formulation) Formula (I) compound 30.0 parts by weight Formula (II) compound 2.5 parts by weight Formula (III) compound 22.5 parts by weight Granular calcium carbonate 4.5 parts by weight Sodium ligninsul Phonate 40.0 parts by weight Sodium dodecylbenzenesulfonate 0.5 parts by weight After mixing the above components and crushing with a jet mill, while adding an appropriate amount of water, granulating and drying using a stirring and mixing granulator After sieving, granules having a particle size of 0.3 to 1.0 mm were obtained.

Separately, calcium carbonate and anhydrous citric acid are mixed 1:
The mixture was pulverized at a ratio of 1 and compression granulated using a dry granulator to obtain a foaming agent having a particle size of 0.3 to 3.35 mm.

Further, the granulated sugar was crushed, a small amount of water was added to the crushed sugar, and the mixture was extruded and granulated, dried and sieved to give a particle size of 0.
Granular sugar of 3 to 1.0 mm was obtained.

20 g of these granules, 30 g of a foaming agent and 20 g of granular sugar were mixed and subdivided into a bag made of a polyvinyl alcohol film to obtain a bag preparation.

[0034]

[Test example]

[0035]

[Test Example 1] Paddy soil was placed in a Wagner pot of 1/5000 are and the seeds were sown, and seeds of Tainubie were sown and mixed with the soil surface layer. When the waterlogging depth was 3 cm, the water was grown in a greenhouse, and when the northern rice millet grew in the 2 leaf stage, a wettable powder prepared in accordance with the above formulation was used to treat a suspension of the reagent at a predetermined concentration with 10 cc per pot. did. On the 30th day after the treatment, the residual mudskipper was extracted, the above-ground living weight was measured, and the ratio to the untreated plot was obtained. The results are shown in Table 1.

[0036]

[Test Example 2] Paddy soil was placed in a Wagner pot of 1/5000 are, and after scraping, the seeds of Inuga Firefly were sown and mixed with the soil surface layer. When the water depth was 3 cm, the plant was grown in a greenhouse, and when the dog firefly was in the 1.5 leaf stage, a predetermined suspension of the reagent solution was treated with 10 cc per pot using a wettable powder prepared according to the above formulation. On the 30th day after the treatment, the remaining dog firefly was extracted, the above-ground fresh weight was measured, and the ratio to the untreated plot was obtained. The results are shown in Table 2.

[0037]

[Test Example 3] Paddy soil was placed in a 0.22 m ² concrete pot installed in a greenhouse, and after scraping, rice plant (variety: Nihonbare) 2.5 leaf stage seedlings were used as 2 plants per plant, and planting depths were 0 cm and 1.5 c.
Four strains each were transplanted at m, and the submerged depth was 4 cm. On the day after transplantation, a predetermined amount was treated with granules prepared according to the above-mentioned formulation. On the 25th day after the treatment, each paddy rice strain was sampled, the aboveground fresh weight was measured, and the ratio to the untreated was determined. The results are shown in Table 3.

[0038]

[Test Example 4] The test was carried out using a field having an area of 8a (20 m x 40 m). Scraping was done on June 19th, and seedlings were mechanically transplanted (paddy rice variety: Nihonbare) on June 22nd, and 7 days later, 8 bags / 8a of a bag formulation prepared according to the above formulation was thrown from the ridge (Fig. 1).

A pole was set up at the place where the chemical was dropped, and the growth of weeds and paddy rice was investigated 25 days after the treatment. The results are shown in Table 4.

[0040]

[Table 1]

[0041]

[Table 2]

[0042]

[Table 3] 0.22m ² concrete pot test Rice planting August 22nd ² plants / share x 4 stocks Treatment August 23 Survey September 17

[0043]

[Table 4] In the above table, "t" means trace.

When the plant height and the number of stems of each of 10 paddy rice plants at the drug dropping points of No. 1 to No. 8 were measured, growth inhibition was not observed at all.

[Brief description of drawings]

FIG. 1 shows the appearance of a field in Test Example 4. No. 1
To No. Up to 8 is the dropping point of the bag formulation, and from A to E is the weed sampling survey point.

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[Procedure amendment]

[Submission date] November 6, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Chemical 1] A compound represented by the following formula (II)

[Chemical 2] And a compound represented by the following formula (III)

[Chemical 3] A herbicidal composition comprising a compound represented by as an active ingredient.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013]

[Chemical 4]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kinji Tanizawa 1041 Yasu, Yasu-cho, Yasu-gun, Shiga Sankyo Stock Company In-house

Claims (1)

[Claims] 1. The following formula (I): A compound represented by the following formula (II): And a compound represented by the following formula (III): A herbicidal composition comprising a compound represented by as an active ingredient.