JPH07233005A - Herbicide composition - Google Patents

Abstract

(57) [Summary] [Structure] 2 ', 3'-dichloro-4-ethoxymethoxybenzanilide and 4-amino-6-tert-butyl-3-methylthio-1,2,4-triazine-5 (4
H) -one is contained as an active ingredient. The herbicidal composition of the present invention comprises 2 ', 3'-dichloro-4-ethoxymethoxybenzanilide and 4-amino-6-tert-butyl-3-methylthio-1,2,2.
Crop selectivity of 4-amino-6-tert-butyl-3-methylthio-1,2,4-triazin-5 (4H) -one by mixing with 4-triazin-5 (4H) -one It is possible to completely control broadleaf weeds and grass weeds without reducing

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a herbicidal composition.

[0002]

2. Description of the Related Art There are many kinds of weeds to be controlled in the current cultivated land of Gramineae crops, and they are roughly classified into annual grass weeds and annual broadleaf weeds.
Among them, grass weeds are closely related to grass crops, so it is difficult to selectively control them, and since the amount of grass weeds is large, there is a problem that if grass weeds are left over, the yield will decrease in agricultural fields. . The current control method controls grass weeds mainly by treating with a soil treatment agent before the occurrence of weeds, but it has drawbacks such as a narrow period suitable for treatment. On the other hand, there are few foliar treatment agents for controlling weeds in grasses, and the existing ones have a problem that phytotoxicity is likely to occur in crops, and the emergence of excellent foliar treatment agents is desired.

2 ', 3'-Dichloro-4-ethoxymethoxybenzanilide (hereinafter referred to as compound 1) is a known compound and is known as a herbicide for paddy rice. {JP-A-56-73055, CA: 79540-50-4
(1979)}.

On the other hand, 4-amino-6-tert-butyl-3-methylthio-1,2,4-triazine-5 (4
H) -one (hereinafter referred to as compound 7) is a herbicide currently used as a foliar herbicide for corn.
Compound 7 as a foliar treatment agent exerts a strong herbicidal effect on annual broad-leaved weeds at a dose usually used, but has a drawback that the herbicidal effect is very weak against annual grass weeds.

[0005]

The herbicide currently used in the corn cultivation area is 2-chloro-
4-ethylamino-6-isopropylamino-1,3,
5-triazine (hereinafter referred to as compound 2) may be mentioned. Compound 2 is intended for the control of both annual broadleaf weeds and annual grass weeds by soil treatment or foliage treatment at the early stage of growth, but as a foliar treatment agent at the early stage of growth, it is a herbicidal effect on annual broadleaf weeds. Is high, but 1
There is a drawback that the weeding effect on annual grass weeds is weak. In addition, the weeds of grasses may increase due to weather and growth conditions. In addition, weeds that have grown slightly have problems such as being unable to be controlled.

[0006]

In order to solve these problems, the present inventors have studied mixing of various herbicides, and as a result, Compound 1 of the present invention and Compound 7 of the present invention can be isolated from each other. It was found that the synergistic effect far exceeded the herbicidal effect for use. Furthermore, in order to make this effect of practical utility value, the present invention has been completed by conducting a detailed study on the amount of dropped drug / mixing ratio, field of application / effect, or chemical damage to crops.

That is, the present invention relates to 2 ', 3'-dichloro-4-ethoxymethoxybenzanilide and 4-amino-.
6-tert-butyl-3-methylthio-1,2,4-
A herbicidal composition comprising triazin-5 (4H) -one as an active ingredient. The synergistic effect in the present invention was recognized in a wide range from low dosage to high dosage. In addition, a wide range of remarkable synergistic effects were also observed in the grass species with respect to the annual grass weeds such as crabgrass and green locust, the annual broad-leaved weeds such as Onami fir, American morning glory, and blue millet. On the other hand, phytotoxicity to corn did not increase synergistically, and the selectivity between crops and weeds was maintained.

The amount of each component used in the herbicidal composition of the present invention is 10 g to 200 g / compound 1 as an active ingredient.
10a, preferably 25 to 100g / 10a.
Compound 7 is 1 g to 25 g / 10a, preferably 5 g to 2
5g / 10a is good.

Active ingredient in the herbicidal composition of the present invention,
The combined ratio of the compound 1 and the compound 7 can be appropriately selected within a range that does not substantially impair the excellent crop selectivity of the present invention. That is, compound 1: compound 7 = 1:
A combined use ratio of 0.01 to 1: 1 (weight ratio) can be selected. A preferable combination ratio is Compound 1: Compound 7 =
It is 1: 0.1 to 1: 1 (weight ratio).

From this, it was confirmed that the herbicidal effect of the present invention is surely exhibited in the field under natural conditions, and the phytotoxicity is not amplified, so that the herbicidal composition of the present invention has extremely high practical value. .

When the compound of the present invention is applied, either on-site mixing or an integrated preparation may be used. In the case of a monolithic preparation, it includes a dosage form that adheres well to foliage, for example, a wettable powder, a wettable granule and a sol.

The carrier used in the composition is an inert organic or inorganic substance such as an organic solvent, water,
Bentonite, zeolite, calcium carbonate, salt and the like 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 are used. Examples include alkyl 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.

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 (compound 1 single agent) 50 parts of compound 1 with 30 parts of clay and 2 parts of white carbon
Parts and pulverized with a jet mill, 12 parts of clay is further added and mixed uniformly, and SOLPOL 503 powder surfactant is added.
9 (Toho Chemical Industry Co., Ltd. trademark: polyoxyethylene alkylaryl ether sulphate) and 5 parts of Lapizole BB75 (Nippon Yushi Co., Ltd. trademark) were mixed well and 50% of Compound 1 was added. Got (All parts are parts by weight. The same applies hereinafter.)

[Formulation Example 2] Preparation of granule wettable powder (mixture of compound 1 and compound 7) To 25 parts of compound 1, 10 parts of compound 7, 5 parts of white carbon, 30 parts of kaolin clay, 50 parts of Solpol
39 (trademark of Toho Chemical Industry Co., Ltd.) 4 copies, Vannox P
1 part of W (trademark of Japan Emulsifier Co., Ltd.) and 25 parts of sodium tripolyphosphate are added, and further 10 parts of water is added, and the mixture is extruded and granulated by a granulator.
A wettable powder of mesh was obtained.

[Preparation Example 3] Preparation of emulsion (mixture of compound 1 and compound 7) To 25 parts of compound 1, 10 parts of compound 7 was dissolved in 17.5 parts of xylene and 40 parts of cyclohexanone to prepare SOLPOL. 10 parts of 800A was added and dissolved by stirring to obtain an emulsion containing 25 parts of compound 1 and 7.5 parts of compound 7.

[Formulation Example 4] Preparation of sol agent (mixture of compound 1 and compound 7) 37.5 parts of compound 1 10 parts of compound 7 40.8 parts of water and surfactant Solpol 3742 (Toho Kagaku) 7 parts of Kogyo Co., Ltd. and Solpol 5712 as an antifoaming agent
0.5 part of Toho Chemical Industry Co., Ltd. was added, and the mixture was pulverized with a sand grinder, and after taking out, 4 parts of ethylene glycol and VANGEL-B (trademark of Sanyo Kasei Co., Ltd.) as a stabilizer were used. In addition, stir well and compound 1
A sol preparation containing 37.5 parts of Compound No. 3 and 15 parts of Compound 7 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] Pot test in greenhouse Greenhouse test of compound 1 and compound 7 prepared by a formulation according to Formulation Example 1 at the 3 to 4 leaf stage of various plants grown in polypropylene pots having a surface area of 150 cm ² A predetermined concentration of 100 l / 10a equivalent was sprayed with a spray gun. One month after the application, a survey by observation was conducted. The results are shown in [Table 1].

The results of the observational survey are displayed according to the following evaluation criteria. [Evaluation criteria of herbicidal effect] 0: Same as untreated 1: 20% control 2: 40% control 3: 60% control 4: 80% control 5: Complete control [Evaluation criteria of chemical damage to crops] 0: No chemical damage 1: Minor damage level 2: Minor damage level Minority level 3: Medium damage level 4: Major damage level 5: Complete death

[0022]

[Table 1]

[Test Example 2] Field test (corn) A unit area of 4 square meters was provided, and various plants were 3 to 4 in the middle of May.
When grown in the leaf stage, 50 l / 10a of a predetermined concentration liquid of an integral formulation prepared by the formulation according to the formulation example was uniformly sprayed into the plot by a hand-pressurized sprayer. One month after the application, a survey by observation was conducted. The evaluation criteria of the investigation were according to Test Example 1. The results are shown in [Table 2].

[0024]

[Table 2]

[0025]

The herbicidal composition of the present invention is 2 ', 3'-
Dichloro-4-ethoxymethoxybenzanilide and 4-
Amino-6-tert-butyl-3-methylthio-1,
Crop possessed by 4-amino-6-tert-butyl-3-methylthio-1,2,4-triazin-5 (4H) -one by mixing with 2,4-triazin-5 (4H) -one It is possible to completely control broadleaf weeds and grass weeds without reducing the selectivity.

Claims (3)

[Claims] 1. 2 ', 3'-Dichloro-4-ethoxymethoxybenzanilide and 4-amino-6-tert-butyl-3-methylthio-1,2,4-triazine-5.
A herbicide composition comprising (4H) -one as an active ingredient. 2. The amount of the active ingredient 2 ′, 3′-dichloro-4-ethoxymethoxybenzanilide used is from 10 g to 2
00g / 10a, active ingredient 4-amino-6-tert-
Butyl-3-methylthio-1,2,4-triazine-5
The herbicide composition according to claim 1, wherein the amount used with (4H) -one is 1 g to 25 g / 10a. 3. The combination ratio of active ingredients is 2 ′, 3′-dichloro-4-ethoxymethoxybenzanilide: 4-amino-6-tert-butyl-3-methylthio-1,2,4.
-Triazin-5 (4H) -one = 1: 0.01 to 1:
The herbicidal composition according to claim 1, which is 1 (weight ratio).