JPS625901A - Germicidal composition - Google Patents

Abstract

PURPOSE:A germicidal composition, containing a specific compound and alpha,alpha,alpha- trifluoro-3'-isopropoxy-o-toluanilide as an active constituent and capable of exhibiting improved controlling effect on bacterial grain rot of rice plants, etc., with a smaller amount of a chemical than the use of the single agent by synergistic effect thereof. CONSTITUTION:A germicidal composition containing 1-ethyl-1,4-dihydro-6,7- methylenedioxy-4-oxo-8-quinolinecar-boxylic acid which is a penetrating plant blight controlling agent and alpha,alpha,alpha-trifluoro-3'-isopropoxy-o-toluanilide which is an excellent germicide against sheath blight of rice plants at 1:0.2-1:10 mixing weight ratio as an active constituent. The above-mentioned composition may be directly used, but is preferably mixed with a carrier or adjuvant and formulated into wettable powder, suspension, dust, etc., or directly or diluted with water and applied to stems and leaves. EFFECT:Bacterial grain rot can be simultaneously controlled with sheath blight or rice plants and the composition is preferred for aspects of environmental pollution, safety, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the use of l-ethyl-1,4-dihydro-6,7-methylenedioxy-4-oxo-8-quinolinecarboxylic acid (hereinafter referred to as compound A) and α, α , α,α-trifluoro-8'-isopropoxy-0-toluanilide (hereinafter referred to as compound B) as an active ingredient.

Rice is the most important crop in Japan's agriculture, and many fungicides have been developed that are effective in controlling blast and sheath blight, which are major rice cultivation diseases, and are expected to increase rice yields and profits. This greatly contributes to improving the quality of rice produced. However, rice cultivation diseases are not limited to the above-mentioned diseases, and controlling one disease can reduce yield due to other diseases.
Problems such as quality deterioration arise. Therefore, in order to control rice cultivation diseases, it is particularly desired to develop a broad-spectrum fungicide that can control a wide variety of diseases.

By the way, in recent years, with the spread of new rice cultivation techniques, especially cultivation techniques using mechanical transplantation, rice blight blight, a rice cultivation disease that was previously limited to a few regions, has become widespread throughout the country, causing yields to decline. Problems such as a steady decline are occurring.

Many existing fungicides are used to control this disease, but none of them have a sufficient control effect, and a new rice blight control agent is eagerly awaited.

In view of these points, the present inventors have conducted intensive studies to develop a fungicide that has a broad spectrum and is capable of controlling rice bacterium blight, which is extremely difficult to control.As a result, the above-mentioned composition of the present invention However, the present inventors have discovered that it is a powerful and versatile fungicidal composition that is not only highly effective against rice blight but also in controlling sheath blight. .

Compound A, which is one of the active ingredients of the composition of the present invention, is a systemic plant disease control agent described in Japanese Patent Publication No. 57-48042, and is effective in controlling plant diseases caused by filamentous fungi. There is a disadvantage that it is inferior.

Compound B, the other active ingredient, is known to be an excellent fungicide against rice sheath blight, but does not exhibit any control effect on rice blight.

The composition of the present invention contains two types of compounds with different activities as described above, but if it only exhibits a complementary effect of simultaneously controlling both rice blight and rice sheath blight. Surprisingly, it also exhibits an excellent synergistic effect against both diseases.

That is, it has a disease control effect so high that it cannot be expected from the disease control effect of each single component. The expression of a synergistic effect by mixing such 2a1 compounds not only brings about efficiency and economic benefits through simultaneous control of two types of diseases, but also makes it possible to reduce the application amount of each component. This is also preferable in terms of safety, such as environmental pollution.

When the composition of the present invention is used for controlling plant diseases, it may be used as it is without adding any other ingredients, but usually,
It is used by mixing with solid carriers, liquid carriers, surfactants and other formulation auxiliaries to formulate emulsions, wettable powders, suspensions, powders, liquids, etc. In the case of ξ, the mixing ratio of compound A and compound B, which are active ingredients, is m1ji, and is 1:0.2 to 1:1.
0, preferably 1:0.5 to 1:5, and the active ingredient content in these preparations is 0.1 to 99.9%, preferably 1 to 90%.

The solid carriers mentioned above include kaolin clay, attapulgite clay, bentonite, acid clay, pyrophyllite, talc, diatom, calcite, corn cob flour, walnut shell flour, urea, ammonium sulfate, and synthetic hydrous oxides. Examples include fine powders or granules such as silicon, and liquid carriers include aromatic hydrocarbons such as xylene and methylnaphthalene, alcohols such as isopropanol, ethylene glycol, and cellosoluble, ketones such as acetone, cyclohexanone, and isophorone, Examples include vegetable oils such as soybean oil and cottonseed oil, dimethysulfoxide, acetonitrile, and water.

Surfactants used for emulsification, dispersion, wet spreading, etc. include alkyl sulfate salts, alkyl (aryl)
Anionic surfactants such as sulfonic acid salts, dialkylsulhonsohakumachi L polyoxyethylene alkyl aryls, di-telluric acid ester salts, naphthalene sulfonic acid formalin condensates, polyoxyethylene alkyl ethers, polyoxyethylene polyoxy Examples include nonionic surfactants such as propylene block copolymers, sorbitan fatty acid esters, and polyoxyethylene sorbitan fatty acid esters.

Adjuvants for formulation include lignin sulfonate, aldinate, polyvinyl alcohol, gum arabic, CMC.
(carboxymethylcellulose), PAP (isopropyl acid phosphate), and the like.

Next, formulation examples of the composition of the present invention will be shown. Note that parts are parts by weight.

Formulation Example 1 20 parts of Compound A, 825 parts of Compound, 8 parts of calcium lignosulfonate, 2 parts of sodium lauryl sulfate, and 50 parts of synthetic hydrous silicon oxide are thoroughly ground and mixed to obtain a wettable powder.

Formulation Example 2 5 parts of compound A, 820 parts of compound, 8 parts of polyoxyethylene sorbitan monooleate, 8 parts of CMC, and 69 parts of water
A suspension is obtained by mixing the two parts and wet-milling until the particle size of the active ingredient is less than 5 microns.

Formulation Example 8 1 part of compound A, 81.6 parts of compound, 87 parts of kaolin clay
．． 6 parts and 10 parts of talc are thoroughly ground and mixed to obtain a powder.

These preparations are sprayed directly or diluted with water. In addition, by mixing it with other disinfectants, it can be expected that the disinfectant efficacy will be increased. Furthermore, it can be used in combination with an insecticide, acaricide, nematocide, herbicide, plant growth regulator or fertilizer.

When the composition of the present invention is used as an active ingredient of a fungicide, the application amount of the active ingredient is usually 0.5 to 2 per are.
0011 is preferably 1 to 100F, and when applying an emulsion, wettable powder, suspension, solution, etc. diluted with water, the application concentration is 0.005 to 0.5%, preferably 0.01
~0.2%, and powders and the like can be applied as is without any dilution.

Next, test examples will show that the composition of the present invention is useful as a disinfectant.

Test Example 1 Rice sheath blight control effect test In a field where paddy rice (Zennanfaze) was mechanically transplanted, test plots of 80 d per plot and 8 repetitions were set up, and cultivation management was carried out as usual.

A cultured culture of rice sheath blight, Bran bran, was uniformly spread over rice fields.

At the appropriate time when the sheath blight had risen on the bridge bodies, the following powder prepared according to Muri Preparation Example 8 was sprayed twice so that it would sufficiently adhere to the leaf surface.

88 days after the final spraying, the incidence of disease was investigated for 50 plants in each area. The results are shown in Table 1.

Table 1 Test Example 2 Rice blight bacterial disease control effect test In a field where paddy rice (Asominori) was mechanically transplanted, 8 test plots of 20 m in length were set up, and cultivation management was carried out as usual. Earing 2
A week ago, a concentration of about lθ spores/ml of Bacterium blight (P.
seudomonas glumae) suspension at 1θ
150 tq4@ inoculated per are. The powder described below, prepared according to Formulation Example 8, was sprayed twice, at the flowering stage and the ear-setting stage, so as to sufficiently adhere to the leaf surface.

Two weeks after the final spraying, the severity of disease was investigated on the panicles of 80 plants in each section according to the following investigation criteria.

In addition, the control value was calculated using the following formula, and the results are shown in Table 2.

Table 2 (10 complete)

Claims (1)

[Claims] 1-ethyl-1,4-dihydro-6,7-methylenedioxy-4-oxo-8-quinolinecarboxylic acid and α, α,
A sterilizing composition comprising α-trifluoro-8'-isopropoxy-o-toluanilide as an active ingredient.