JPH06227918A - Herbicidal composition - Google Patents

Abstract

PURPOSE:To provide a herbicidal composition quick-acting even on monocotyledonous weeds, having excellent herbicidal effect, consisting of a combination of a specific benzoxazine-3-one derivative and at least one kind of compound selected from glyphosate, butamifos, sethoxydim, trifluralin etc. CONSTITUTION:The objective herbicidal composition comprising a combination of (A) a benzoxazine-3-one derivative of formula I [R<1> and R<2> are each alkyl; R<3> and R<4> are each (halogen-, alkoxy or alkoxycarbonyl-substituted) alkyl)] and (B) at least one kind of compound selected from the group consisting of glyphosate of formula II, butamifos of formula III, sethoxydim of formula IV, trifluralin of formula V, alachlor of formula VI, benthiocarb of formula VII and simetryn of formula VIII. This composition has excellent herbicidal effects on both broadleaf and monocotyledonous weeds by soil treatment or treatment on stems/leaves.

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 At present, many kinds of herbicides are used for weeding of agricultural land or non-agricultural land depending on the purpose and use. However, the types of weeds to be controlled are extremely large, and on the one hand, the development of more selective herbicides is required, while on the other hand, they have a broader herbicidal spectrum and a stronger herbicidal activity. There is also a demand for the development of herbicides having herbal effects.

In view of such circumstances, the present inventors have proposed a novel benzoxazine compound as a compound having excellent selectivity and high herbicidal activity (EPC Patent Publication No. 0479420A2 or Japanese Patent Laid-Open No. 5-279420). 4977
(See Japanese Patent Publication). On the other hand, glyphosate (A), butamiphos (B), setoxydim (C), trifluralin (D), alachlor (E), benchocarb (F) and synmethrin (G) are known herbicides, each of which has the following formula:

[0004]

[Chemical 2]

It is a compound having a chemical structure represented by: Glyphosate (A) is a drug having a slightly low activity against broad-leaved weeds, and having a slow-acting effect and a slow onset of effect. Cetoxydim (C) is a cyclohexenone herbicide and shows a selective effect only on monocotyledon weeds as a foliar treatment agent. Also, trifluralin (D), alachlor (E), benchocarb (F) and butamifos (B) are effective as soil treatment agents, but they are slightly less active against broadleaf weeds, and simmethrin (G) is a simple substance. High activity against cotyledon weeds, but little effect against broadleaf weeds.

[0006]

The benzoxazine compound is a compound showing a strong herbicidal activity against both broadleaf weeds and monocotyledonous weeds by foliar treatment or soil treatment. The effect is rather weak, and a relatively high dose is required to obtain a sufficient effect.
Therefore, it is an object of the present invention to develop a herbicide that is effective against monocotyledon weeds, making the best use of the characteristics of the above-mentioned benzoxazine compounds to exhibit high herbicidal activity against broadleaf weeds and rapid activity.

[0007]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that a specific compound among the above-mentioned benzoxazine compounds and glyphosate, butamifos, and setoxydim which are known herbicides. , Trifluralin, alachlor, benchocarb and at least one compound selected from the group of synmethrin are mixed to obtain a composition having a fast-acting effect on monocotyledon weeds and an excellent herbicidal effect. Succeeded and completed the present invention.

That is, according to the present invention, (i) the general formula (I):

[0009]

[Chemical 3]

[In the formula, R ¹ and R ² are each independently a lower alkyl group, and R ³ and R ⁴ are each independently a hydrogen atom or an optionally substituted lower alkyl group (wherein the substituent is halogen. Atom, a lower alkoxy group or a lower alkoxycarbonyl group)]
A benzoxazin-3-one derivative represented by
There is provided a herbicidal composition containing, as an active ingredient, i) at least one compound selected from the group consisting of glyphosate, butamiphos, setoxydim, trifluralin, alachlor, benchocarb and synmethrin.

In the above general formula (I), R ¹ , R ² ,
The lower alkyl group represented by R ³ and R ⁴ is a linear or branched alkyl group having 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms, for example, methyl group, ethyl group, propyl group, isopropyl group, butyl group. Group, isobutyl group and the like. Further, in the substituted lower alkyl group represented by R ³ and R ⁴ , the substituent that may be substituted is 1 to 3 of a fluorine atom, a chlorine atom or a bromine atom as a halogen atom, a methoxy group or an ethoxy group as a lower alkoxy group. Group, a lower alkoxy group having 1 to 4 carbon atoms such as a propoxy group or a butoxy group, a lower alkoxycarbonyl group such as a methoxycarbonyl group, an ethoxycarbonyl group or a propoxycarbonyl group having 1 to 6 carbon atoms, preferably There may be mentioned 1 to 4 lower alkoxycarbonyl groups.

The benzoxazin-3-one derivatives of the general formula (I) are described in the above-mentioned EPC Patent Publication No. 047942.
It can be produced according to the method described in JP-A-0A2 or JP-A-5-4977. Table 1 shows typical examples of the produced compounds.

[0013]

[Table 1]

The known herbicides glyphosate (A), butamiphos (B), setoxydim (C), trifluralin (D), alachlor (E), benchocarb (F) and synmethrin (G) are commercially available. It is a drug and can be easily obtained. Further, glyphosate and butamifos are typical organophosphorus herbicides, and it is suggested that they may be substituted with other organophosphorus herbicides having similar properties, such as glufosinate and bialaphos.

The herbicidal composition according to the present invention has an excellent herbicidal effect on both broadleaf weeds and monocotyledonous weeds by soil treatment or foliage treatment. The composition of the present invention may be used as it is, but various carriers, surfactants, other formulation auxiliary agents are mixed, and powders, granules, flowable agents, wettable powders, It is preferable to formulate and apply it in an emulsion, an oil agent or the like. Here, the carrier may be either solid or liquid, for example, talc,
Clay, bentonite, kaolin, diatomaceous earth, calcium carbonate, charcoal, starch, gum arabic, water, alcohol, kerosene, naphtha, xylene, cyclohexane, acetone, dimethylformamide and the like can be mentioned. Examples of the surfactant include alkylsulfuric acid, alkylarylsulfonate, dialkylsulfosuccinate salt and the like, and examples of other formulation auxiliary agents include alginate, polyvinyl alcohol, CMC and the like.

The herbicidal composition according to the present invention can be provided in the form of emulsions, wettable powders, powders, granules and the like, and if necessary, various herbicides, various insecticides, fungicides, plants. You may mix and apply it to a growth regulator.

In carrying out the present invention, the concentrations of the above-mentioned components (i) and (ii) in the herbicidal composition of the present invention can be varied over a wide range, but generally 1 to 50 g of the component (i) per 10 are and It is preferable to use the component (ii) in the range of 5 to 100 g. When manufacturing the above-mentioned various preparations, it may be manufactured so as to contain the active ingredient in the range of 5 to 70%.

[0018]

EXAMPLES The present invention will be described in more detail below with reference to formulation examples and test examples, but it goes without saying that the scope of the present invention is not limited to these formulation examples and test examples. In the examples,% is% by weight.

Formulation Example 1 (wettable powder ) Compound No. 7 5%, setoxydim (C) 30
%, Sodium alkylbenzene sulfonate 2%, polyoxyethylene alkylaryl ether 3%, and Sikelite 60% were uniformly mixed and pulverized to obtain a wettable powder.

Formulation Example 2 (emulsion ) Compound No. 3 5%, butamiphos (B) 25%,
20% polyoxyethylene alkyl ether and 50% xylene were uniformly mixed to obtain an emulsion.

Formulation Example 3 (granules ) Compound No. 3 compound 2%, Synmethrin (G) 3%,
Bentonite 20%, sodium dodecylbenzenesulfonate 2% and clay 73% were uniformly mixed, and about 20% of water was added and kneaded. This was granulated with a granulator and dried to obtain a granule.

Next, the effects of the composition of the present invention will be specifically shown by test examples. Test Example 1 (Stem and Leaf Treatment ) Various seeds of crabgrass, barnyard grass, and starfish were sown in a 6 cm × 15 cm × 10 cm seedling case filled with soil. After growing at room temperature for 10 days, a predetermined amount of the test compound (single agent or mixed agent) which was made into a wettable powder according to Formulation Example 1 was diluted with 200 liters of water equivalent to 10 ares, and was uniformly applied to the entire surface of the foliage. Sprinkled on. After 3 weeks from the drug treatment, the effect was visually observed and evaluated by the degree of herbicidal activity (5: complete death to 0: no action). The results obtained are shown in Table 2.

[0023]

[Table 2]

Test Example 2 (Soil Treatment ) Various seeds of the crabgrass, the barnyard grass, and the starfish were sown in a 6 cm × 15 cm × 10 cm seed ring case filled with soil. On the day after seeding, a prescribed amount of the test compound (single agent or mixed agent) which was made into a wettable powder according to Formulation Example 1 was diluted with 200 liters of water equivalent to 10 ares and sprayed uniformly on the soil surface. 2 weeks after the drug treatment, the effect is visually observed,
The degree of grass killing (5: complete death to 0: no action) was evaluated. The results obtained are shown in Table 3.

[0025]

[Table 3]

[0026]

INDUSTRIAL APPLICABILITY As described above, the herbicidal composition of the present invention has a synergistic effect of both agents and is capable of obtaining an excellent herbicidal effect with a low dose against a wide range of weeds which are difficult to control by a single agent. .

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Ryuichi Saai 1787-1 Shimokasuya, Isehara City, Kanagawa Prefecture (72) Inventor Keitaro Ikai 6348 Tamura, Hiratsuka City, Kanagawa Prefecture

Claims (1)

[Claims] 1. (i) General formula (I): [In the formula, R ¹ and R ² each independently represent a lower alkyl group, and R ³ and R ⁴ each independently represent a hydrogen atom or an optionally substituted lower alkyl group (wherein the substituent is a halogen atom, a lower atom). An alkoxy group or a lower alkoxycarbonyl group)], and (ii) glyphosate, butamiphos, setoxidim, trifluralin,
A herbicidal composition containing, as an active ingredient, at least one compound selected from the group consisting of Alacrole, Bentocarb and Symmelisin.