JPS61225103A - Herbicidal composition - Google Patents

Abstract

PURPOSE:To provide a herbicidal composition containing a specific compound and atrazine, etc., as active components, exhibiting excellent synergistic herbicidal effect compared with the separate application of each component, and capable of controlling various weeds such as Indian mallow, white-bird's-eye, etc., either by foliar treatment or by soil treatment at a low rate of application. CONSTITUTION:The objective composition is obtained by mixing (A) 2-[4- chloro-5-(1-butyn-3-yl)oxy-2-fluorophenyl]-4,5,6,7-tet-rahydro-2H-isoi ndole-1,3-dione of formula I having herbicidal activity with (B) an S-triazine derivative of formula II (X is H or CN; when X is H, the compound is atrazine, and when X is CN, the compound is cyanazine) known as a herbicide, and using the mixture as active component. The amount of the compound of formula II is 2-200 pts.wt. per 1pt.wt. of the compound of formula I. It is applied in a form suitable for application using a carrier or an adjuvant, etc. EFFECT:Effective for the selective control of a wide variety of weeds especially in corn field and wheat field and free of phytotoxity to corn and wheat, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides 2-[4-chloro-5-(l-butyne-8-
yl)oxy-2-fluorophenyl]-4,5,6,
7-tetrahydro-2H-isoindole-1,8-dione [hereinafter referred to as compound CI] and the general formula [wherein, X represents a hydrogen atom or a cyano group]. '' (hereinafter referred to as atrazine or cyanazine) as an active ingredient (hereinafter referred to as the composition of the present invention). .

Currently, many herbicides are used as herbicides for upland fields, but because there are many types of weeds to be controlled and their emergence takes place over a long period of time, they are more effective at killing weeds and have a wider herbicidal spectrum. There is a need for herbicides that are both safe and safe for crops.

As a result of various studies aimed at developing a herbicide that meets these objectives, the present inventors have found that the composition of the present invention containing compound (I) and atrazine or cyanazine as active ingredients can be used for foliage treatment and soil treatment. Both treatment methods can selectively kill a wide range of weeds, especially in corn and wheat fields, and their herbicidal effects are synergistically enhanced compared to when they are used alone. discovered that it could be applied at low doses and completed the present invention.

The composition of the present invention can be used to eliminate various weeds that are problematic in the treatment of foliage and soil in upland areas, such as freckle weeds, Japanese knotweed, purslane, chickweed, whiteweed, blueberry, white-bellied grass, American hornwort, black-and-white weed, common grass, and golden deer. , field pansies, morning glories such as morning glory, dicot plants such as Physalis Physalis, Physalis spp., Japanese Physalis, Corn marigold, Dicotyledonous plants such as Elephant spp.
It has a violet-killing effect on monocotyledonous plants such as sorghum, sorghum, sorghum, barley, sycamore, and sorghum, and does not cause any harmful effects on corn and corn.

Compound (■) (JP-A No. 58-88256) has a herbicidal effect, and has a herbicidal effect on atrazine and cyanazine (He
rbjcicle Handbook of Lbe
WeedScience 5ociety o
f Arr+crica, hゝ10th
Edition P 80 and P, ] 19 (1988)) are known as herbicides.

The mixing ratio of compound (1), which is an active ingredient of the composition of the present invention, and atrazine or cyanazine can be varied over a relatively wide range, but usually it is Table 1 shows the chemical structural formulas of Compound (I), atrazine, and cyanazine in an amount of 2 to 20 parts by weight, preferably 4 to 100 parts by weight.

Table 1 When using the composition of the present invention as a herbicide, it is usually formulated into emulsions, wettable powders, suspensions, granules, etc. using solid carriers, liquid carriers, surfactants, and other formulation auxiliaries. Formulate.

These preparations contain active ingredients in a weight ratio of 05 to 90%;
Preferably the content is 2 to 80%.

Solid carriers include kaolin clay, attapulgite clay, bentonite, acid clay, pyrophyllite,
Examples include fine powders or granules such as talc, diatomaceous earth, calcite, walnut powder, urea, ammonium sulfate, and synthetic hydrated silicon oxide.As liquid carriers, aromatic hydrocarbon complexes such as xylene and methylnaphthalene, isopropanol, Alcohols such as ethylene glycol and cellosolve, ketones such as acetone, cyclohexanone and isophorone, vegetable oils such as soybean oil and cottonseed oil, dimethyl sulfoxide, N, N-
Examples include dimethylformamide, acetonitrile, water, etc.

Surfactants used for emulsification, dispersion, wet carbonization, etc. include alkyl sulfate salts, alkyl (aryl)
Anionic surfactants such as sulfonates, dialkyl sulfosuccinates, polyoxyethylene alkylaryl ether phosphate ester salts, polyoxyethylene argyl ether, polyoxyethylene alkylaryl ether, polyoxyethylene polyoxypropylene brosokubori Examples include nonionic surfactants such as sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, and polyoxyethylene sorbitan fatty acid ester. Examples of formulation auxiliaries include lignin sulfony/[salt, alginate, polyvinyl alcohol, gum arabic, CMC (carboxymethyl cellulose), PAP (isopropyl acid phosphate), and the like.

Examples of formulations are shown below. Note that parts indicate parts by weight.

Formulation Example 1 6 parts of Compound (I), 44 parts of atrazine, 8 parts of calcium lignosulfonate, 2 parts of sodium lauryl sulfate, and 45 parts of synthetic hydrous silicon oxide are thoroughly ground and mixed to obtain a wettable powder.

Formulation Example 2 Compound (I) 0.5 parts, cyanazine 4.5 parts, polyoxyethylene styrylphenyl ether 14 parts, dodecylbenzenesulfonate calcicum 1 6 parts, xylene 85 parts
1 part and 40 parts of isophorone are thoroughly mixed to obtain an emulsion.

Formulation Example 8 Compound (1) 0.2 parts, atrazine 1.3 parts, synthetic hydrous silicon oxide 1 part, calcium ligninsulfonate 2 parts,
80 parts of bentonite and 65 parts of kaolin clay are thoroughly ground and mixed, water is added and the mixture is thoroughly kneaded, followed by granulation and drying to obtain granules.

Formulation Example 4 Compound (1) 2 parts, cyanazine 23 parts, polyoxyethylene sorbitan monooleate 3 parts, CMCa part, water 6 parts
A suspension is obtained by mixing 9 parts and wet milling until the particle size is less than 5 microns.

These preparations can be used as they are or diluted with water, etc. for foliage treatment or soil treatment. In the case of soil treatment, the formulation is spread on the soil surface (if necessary, mixed with the soil after spreading), and the soil is irrigated with a scythe.

Furthermore, by mixing it with other herbicides, it can be expected to increase the herbicidal efficacy. Furthermore, it can be used in combination with insecticides, acaricides, nematicides, fungicides, plant growth regulators, fertilizers, soil conditioners, and the like.

The application amount of the composition of the present invention varies depending on weather conditions, soil conditions, formulation form of the composition, mixing ratio of active ingredients, target weeds and crops, etc., but usually the total amount of active ingredients per are is 0.3~ 40g, preferably 1-20g.

Emulsions, wettable powders, suspensions, etc. are usually diluted with 1 liter to 10 sytor of water per are (if necessary, a spreading agent such as a spreading agent is added) and applied. Agents are usually applied as is without any dilution.

In addition to the above-mentioned surfactants, the spreading agents include polyoxyethylene resin acid (ester), lignin sulfonate,
Examples include abietate, dinaphthylmethane disulfonate, and paraffin.

Next, test examples will be given to specifically demonstrate the herbicidal effect of the composition of the present invention. The active ingredients of the composition of the present invention are shown in Table 1. In addition, the herbicidal efficacy was calculated from the following formula by weighing the fresh weight of the above-ground parts of the test plants that remained withered at the time of the survey, and was expressed as a growth inhibition rate (%).

Test Example 1 Upland Stem and Leaf Treatment Test A cylindrical plastic pot with a diameter of 10 oy + and a depth of -0 cPn was filled with upland soil, and ρ morning glory was sown.
Raised for 21 days and f. Thereafter, a predetermined amount of the composition of the present invention was made into an emulsion according to Formulation Example 2, diluted with water containing a spreading agent equivalent to 10 liters per area, and treated with a small sprayer from one side of the plant. Shi1ko. At this time, the growth status of X. morning glory was in the 8-4 leaf stage.

Herbicidal efficacy was investigated 20 hours after treatment. The results are shown in Table 2. Note that this test was conducted outdoors throughout the entire period.

Table 2 Test Example 2 Field soil stem and leaf treatment test A vat with an area of 88 x 28 d and a depth of 11 cm was filled with field soil, and sowed with Japanese crocodile, Japanese cabbage, Japanese Physalis, morning glory, American hornwort, and corn, and grown for 21 days. Thereafter, a predetermined amount of the composition of the present invention made into an emulsion according to Formulation Example 2 was diluted with water equivalent to 5 liters per area containing a spreading agent, and sprayed onto the entire surface of the grass from one side of the plant using a small sprayer. Treated uniformly. At this time, the growth conditions of weeds and crops vary depending on the grass species, but
It was at the 1-4.5 leaf stage. The herbicidal efficacy was investigated 20 days after the treatment. The results are shown in Table 3. This test was conducted in a greenhouse throughout the entire period.

Table 8 Test Example 8 Upland Soil Treatment Test A vat with an area of 88 x 28 i and a depth of 11 crn was filled with upland soil, and MT of Japanese millet, Japanese foxtail, Japanese yam, morning glory, Japanese Physalis, Ebisu grass, and corn were carried out using MT.
M and covered with soil to a thickness of 1 to 2 crn. A predetermined amount of the composition of the present invention made into a wettable powder according to Formulation Example 1 was diluted with water equivalent to 10 liters per 1 area, and was sprayed onto the soil surface using a small sprayer. After treatment, the plants were grown in a greenhouse for 20 days and their herbicidal efficacy was investigated. The results are shown in Table 4.

Table 4 Test Example 4 Upland Soil Treatment Test A vat with an area of 88 x 28 i and a depth of 11 crn was filled with upland soil, and chickweed, wild mustard, blackberry, buckwheat, and wheat were sown and covered with soil to a thickness of 1 to 2 cm. A predetermined amount of the composition of the present invention made into a wettable powder according to Formulation Example 1 is diluted with water equivalent to 10 liters per are,
It was applied to the soil surface using a small sprayer. After treatment, the plants were grown in a greenhouse for 27 days and their herbicidal efficacy was investigated. The results are shown in Table 5.

Table 5 (14 completed)

Claims (1)

[Claims] 2-[4-chloro-5-(1-butyn-3-yl)oxy-2-fluorophenyl]-4,5,6,7-tetrahydro-2H-isoindole 1,3- Diones and general formulas ▲ Numerical formulas, chemical formulas, tables, etc. are available ▼ [In the formula, X represents a hydrogen atom or a cyano group. ] A herbicidal composition comprising an s-triazine derivative represented by the following as an active ingredient.