JPH09175914A - Herbicide composition - Google Patents

Abstract

(57) [Summary] [Structure] A herbicide composition comprising 2 ', 3'-dichloro-4-ethoxymethoxybenzanilide and a phenyl-N-methylcarbamate compound as active ingredients. [Effect] The herbicidal composition of the present invention has an effect of prolonging the soil residual effect period on grass weeds, and since it exerts a synergistic effect, it is possible to reduce the amount of the drug to be dropped. It is possible to completely control grass weeds for a long period of time without decreasing the crop selectivity possessed by these agents.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a herbicide composition.

[0002]

2. Description of the Related Art There are many kinds of weeds to be controlled in the present rice cultivating land, and the particularly problematic ones are the annual grass weed Novie and annual broadleaf weed. Among them, grass weeds are closely related to gramineae crops, so that selective control is difficult, and the amount of grass weeds is large. If grass weeds are left over, it will directly lead to the problem of crop loss in agricultural fields. Therefore, the current control method is to control Nobie and annual broad-leaved weeds by transplanting transplanted rice and treating with a soil treatment herbicide before the emergence of weeds, but the duration of the herbicidal effect is 35 to 45. It's about a day.

The composition of the present invention, 2 ', 3'-dichloro-4-ethoxymethoxybenzanilide (hereinafter
Is a known compound and is known as a herbicide for paddy rice (JP-A-56-73055).

One composition of the present invention, Phenyl-N.
-Methylcarbamate compounds include 1-naphthyl-N-
Methyl carbamate (hereinafter referred to as Chemical formula 2), 2-naphthyl-N-methyl carbamate (hereinafter referred to as Chemical formula 3),
3,5-xylyl-N-methylcarbamate (hereinafter referred to as "Chemical formula 4"), 2-secondary butylphenyl-N-methylcarbamate (hereinafter referred to as "Chemical formula 5"), methatril-
N-methyl carbamate (hereinafter referred to as "Chemical formula 6") and 2
-Isopropylphenyl-N-methylcarbamate (hereinafter referred to as "Chemical formula 7") and the like, which are widely used as insecticides for paddy rice. The phenyl-N-methylcarbamate compound exerts an insecticidal effect as a foliar spraying agent in a normally used dose, and is known as a control agent for planthoppers and leafhoppers.

[0005]

Problems to be Solved by the Invention After transplanting rice, the weeding effect duration required for the weeds not to bear fruit is 45
It is said to be about a day. Chemical formula 1 has a high degree of crop selectivity between Nobie and transplanted rice, but the duration of the herbicidal effect as a herbicide is about 30 to 40 days after soil treatment,
Further duration of herbicidal effect is required.

Further, in the current rice cultivation, there is a strong demand for the spread of the direct seeding rice cultivation method instead of the transplanted rice cultivation method in order to reduce the labor force. However, in the direct seeding paddy rice cultivation, there is a problem that the herbicide causes phytotoxicity to the direct seeding rice and the initial growth is delayed, and thus the emergence of a herbicide having excellent selectivity is desired. Similar to the transplanted rice, the chemical formula 1 has a high crop selectivity between the direct-seeded rice and the Nobye, but the herbicidal effect duration after soil treatment is about 30 to 40 days. In direct seeding paddy rice cultivation, the duration required for the weeds not to set fruit is about 60 days, and a longer duration of herbicidal effect is desired.

[0007]

The present inventors have studied various compositions in order to solve these problems, and as a result,
By mixing the chemical formula 1 of the present invention with the phenyl-N-methylcarbamate compound, the soil residual effect period of the chemical formula 1 is prolonged, and further, a synergistic effect far exceeding the herbicidal effect of the chemical formula 1 alone is shown. I found it.

Further, in order to confirm whether or not the present effect is actually useful, the amount of the dropped drug, the mixing ratio, the range of action,
The present invention has been completed by making detailed examinations regarding the effects or the chemical damage to crops.

The synergistic effect of the present invention was observed in a wide range from low dose to high dose against Nobie, an annual grass weed. On the other hand, the phytotoxicity against rice did not increase synergistically with transplanted rice and direct-seeded rice, and the high selectivity between rice and novier was maintained.

As a result, in a field under natural conditions, a synergistic herbicidal effect is exerted while maintaining the high selective action of the chemical formula 1, and the soil residual effect period is extended. It was confirmed that the herbicide composition has extremely high practical value.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the practical use amount of the present invention, 10 g to 200 g / 10a, preferably 25 g to 150 g / 10a of the chemical formula 1 is used as an active ingredient. The phenyl-N-methyl carbamate compound may be 1 g to 200 g / 10a, preferably 10 g to 100 g / 10a. However, the total dose of Chemical Formula 1 and the phenyl-N-methylcarbamate compound is preferably 100 g to 200 g / 10a.

The combination ratio of the compound of the present invention 1 and the phenyl-N-methyl carbamate compound may be appropriately selected in consideration of economical efficiency within a range that does not substantially impair the excellent selectivity of the present invention. it can. For example, chemical formula 1: phenyl-N-
A combination ratio of methyl carbamate compound = 0.1: 1 to 10: 1 (weight ratio) can be exemplified. Preferably, the chemical formula 1: phenyl-N-methyl carbamate compound = 1: 1 to 5:
A combination ratio of 1 (weight ratio) can be exemplified.

In spraying the compound of the present invention, for example, spraying by an integral preparation can be mentioned. In the case of a monolithic preparation, it includes a dosage form that is uniformly dispersed, such as granules, wettable powders, wettable granules and sol preparations.

As the carrier used in the composition, an inert inorganic substance such as water, bentonite, zeolite, calcium carbonate, or salt can be used.

As the dispersant or the fixing agent, various surfactants such as alkylnaphthalenesulfonic acid formalin condensate, dialkylsulfosuccinate, polyoxyethylene alkylaryl ether, polyoxyethylene lauryl ether, polyoxyethylene alkyl are used. Examples include aryl ethers and polyoxyethylene dodecyl ethers.

Further, auxiliary agents such as a thickener, a defoaming agent and a stabilizer can be appropriately selected and added.

[0017]

The present invention will be specifically described below with reference to examples. The examples are described separately as [formulation example] and [test example].

The compositions of the present invention will be specifically shown below as formulation examples for each formulation.

[Formulation Example 1] Preparation of wettable powder (single agent of Chemical Formula 1) 50 parts of Chemical Formula 1 (parts represent parts by weight; hereinafter the same) 33 parts of clay and 1 part of white carbon After crushing with a jet mill, 9 parts of clay and 1 part of white carbon were further added and mixed uniformly, and 5 parts of powdered surfactant Solpol 5039 (trademark of Toho Chemical Industry Co., Ltd.) and Lapizole BB75 (NOF CORPORATION). 1 part (trademark) was added and mixed well to obtain a wettable powder containing 50% of Chemical Formula 1.

[Formulation Example 2] Preparation of Granules (Chemical Formula 1 and Chemical Formula 2)
Mixing agent) 10 parts of Chemical Formula 1 and 5 parts of Chemical Formula 2 were mixed with 45 parts of clay and 20 parts of bentonite and mixed uniformly, and 10 parts of surfactant Solpol 800A (trademark of Toho Chemical Industry Co., Ltd.) and tripolyphosphoric acid. 10 parts of soda was added, an appropriate amount of water was further added and kneaded, and the mixture was granulated using a granulator to obtain granules containing 10% of chemical formula 1 and 5% of chemical formula 2.

[Formulation Example 3] Preparation of granule wettable powder
And a mixture of Chemical Formula 3) 60 parts of Chemical Formula 1, 20 parts of Chemical Formula 3, 5 parts of white carbon, Solpol 5039 (trademark of Toho Chemical Industry Co., Ltd.)
4 parts, 1 part of Vannox PW (trademark of Nippon Emulsifier Co., Ltd.) and 10 parts of sodium tripolyphosphate were added, and further 1 part of water was added.
Granule wettable powder containing 0% and granulated by an extrusion granulator, dried to remove water and then sieved to contain 60% of Chemical Formula 1 and 20% of Chemical Formula 3 of 10-48 mesh Got

[Formulation Example 4] Preparation of sol agent (mixture of chemical formula 1 and chemical formula 4) 30 parts of chemical formula 1 and 10 parts of chemical formula 4 in 48.3 parts of water and surfactant Solpol 3742 (Toho Chemical Industry Co., Ltd.) Trademark Co., Ltd. 7
Parts and 0.5 parts of Solpol 5712 (trademark of Toho Chemical Industry Co., Ltd.) as an antifoaming agent, crushed with a sand grinder, and after taking out, 4 parts of ethylene glycol as a stabilizer and VANGEL-B (Sanyo Chemical Co., Ltd. ) Trademark) 0.
Add 2 parts and stir well to give 30% of Chemical formula 1 and 10 of Chemical formula 4
% Of the sol was obtained.

Hereinafter, the herbicidal effect of the herbicide of the present invention will be specifically described with reference to test examples.

Test Example 1 Soil residual effect test in greenhouse A 200 cm ² polypropylene pot was filled with paddy soil to make a submerged depth of 3 cm. The following day, the prescribed amounts of the single agents and the mixed agents of Chemical Formula 1, Chemical Formula 2 and Chemical Formulation 3 formulated with the formulation according to Formulation Example 1 and Chemical Formula 1, Chemical Formulation 4 and Chemical Formulation 5 with the formulation according to Formulation Example 4; The single agents of Chemical formulas 6 and 7 and a predetermined amount of the mixed agent were uniformly sprayed on the soil surface. 20 seeds of Novier seeds were sown on the soil surface every 1 week of the chemical treatment, and two weeks after the seeding of the Novier seeds, an observational investigation was conducted. The results are shown in Table 1.

The results of the observational survey are displayed according to the following evaluation criteria. (The same applies to the following surveys.) [Evaluation criteria for herbicidal effect] 0: Same as no treatment 1: 20% control 2: 40% control 3: 60% control 4: 80% control 5: Complete control

[0026]

[Table 1]

Test Example 2 Herbicidal Effect Test in Greenhouse A 200 cm ² polypropylene pot was filled with paddy soil, seeds of Nobie were sown on the soil surface, and the germinated rice was planted on the soil surface to obtain 2 to 2.5 leaves. Transplanted paddy rice grown in the
Flooding conditions were used. The water depth was 3 cm. The treatments were the prescribed amounts of the single agents and the mixed agents of Chemical Formula 1, Chemical Formula 2 and Chemical Formula 3 formulated with the formulation according to Formulation Example 1, and Chemical Formula 1, Chemical Formula 4 and Chemical Formula 5 with the formulation according to Formulation Example 4. , A predetermined amount of the single agent of Chemical formula 6 and Chemical agent 7 and a predetermined amount of the mixed agent were uniformly sprayed on the soil surface. Scatter 1
An observational study was conducted a month later. The results are shown in Table 2.

[0028]

[Table 2]

[0029]

[Table 3]

[0030]

[Table 4]

[0031]

[Table 5]

[0032]

[Table 6]

[0033]

[Table 7]

[Test Example 3] Field test A unit of 2 m ² was provided, and seeds of Novier were sown on the soil surface. As the transplanted paddy rice, 10 paddy rice plants grown in the 2nd leaf stage were transplanted in 3 strains. For direct-seeded paddy rice, germinated rice was planted on the soil surface. The submersion depth was 3 cm. Rice transplant 5
Day later (the beginning of weed development) and 18 days later (Novier 3 leaf stage)
Then, a predetermined amount of the single agent of Formula 1 and the integrated preparation, which were prepared by the formulation according to the formulation example, were uniformly dispersed in the plot. One month after the application, a survey by observation was conducted. The criteria for investigation were in accordance with Test Example 1. The results are shown in Table 3.

[0035]

[Table 8]

[0036]

[Table 9]

[0037]

As is apparent from each test example, the herbicidal composition of the present invention has the effect of extending the soil residual effect period by mixing (1) Chemical formula 1 and the phenyl-N-methylcarbamate compound. It is possible to prolong the duration of the herbicidal effect of Chemical 1 up to 60 days, which is required for transplanted paddy rice cultivation and direct seeding paddy rice cultivation.

(2) A synergistic effect is exhibited by mixing the compound 1 and the phenyl-N-methylcarbamate compound,
It is possible to reduce the amount of the drug administered by Chemical 1 as compared with the amount of the drug administered by Chemical 1 alone.

Further, by mixing (3) Chemical formula 1 with a phenyl-N-methylcarbamate compound, it is possible to completely control Nobies while maintaining the crop selectivity of the compound shown in Chemical formula 1. .

From the above effects, the herbicidal composition of the present invention is a very useful soil-treating herbicidal composition for both transplanted rice cultivation and direct seeding rice cultivation.

Claims (1)

[Claims] 1. A herbicidal composition comprising 2 ', 3'-dichloro-4-ethoxymethoxybenzanilide and a phenyl-N-methylcarbamate compound as active ingredients.