JPS625902A - Germicidal composition - Google Patents

Abstract

PURPOSE:A germicidal composition, containing a specific compound and 3'- isopropoxy-2-methylbenzanilide as an active constituent and capable of controlling bacterial grain rot and sheath blight of rice plants at the same time 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-quinolinic acid which is a penetrating plant blight controlling agent and 3'-isopropoxy-2-methylbenzanilide which is an excellent germicide against sheath blight of rice plants at 1:0.2-1:10 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. The content of the active constituent in the above-mentioned formulation is 0.1-99.9%. EFFECT: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 87-iso Propoxy-2
- It relates to a bactericidal composition containing methylbenzanilide (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 has greatly contributed 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 have arisen. 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, due to 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 and is now disappearing. Problems have arisen, such as a steady decline in

Many existing fungicides are used to control this disease, but none of them have sufficient control effects.
1---1 A new rice fir fungal disease control agent is eagerly awaited.

In view of these points, the present inventors have made extensive studies to develop a fungicide that has a wide spectrum and is capable of controlling rice bacterium blight, which is extremely difficult to control. It was discovered that the composition is a powerful and versatile fungicidal composition that is not only highly effective against rice filament fungi, but also exhibits an excellent effect in controlling sheath blight. So perfect.

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. 7-48042. The disadvantage is that the control effect is inferior.

In addition, the other active ingredient, Compound B, is known to be an excellent fungicide against rice sheath blight;
It does not show any control effect against rice blight.

The composition of the present invention contains the two compounds with different activities as described above, but if it only exhibits a complementary effect of simultaneously controlling both rice bacterium 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 two types of compounds is simply due to the combination of two types of compounds.
Not only does it bring about efficiency and economic benefits through simultaneous control of seed diseases, but it also makes it possible to reduce the amount of each component applied, which is favorable 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 this case, the mixing ratio of compound A and compound B, which are active ingredients, is 1:0.2 to 1:10 by weight,
The ratio is 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 above-mentioned solid carriers include fine particles such as kaolin clay, attapulgite clay, bentonite, acid clay, pyrophyllite, talc, diatomaceous earth, calcite, corn cob powder, walnut shell powder, urea, ammonium sulfate, and synthetic hydrous silicon oxide. Examples of liquid carriers include aromatic hydrocarbons such as xylene and methylnaphthalene, alcohols such as isopropanol, ethylene glycol, and cellosolve, ketones such as acetone, cyclohexanone, and isophorone, soybean oil, cottonseed oil, etc. vegetable oil, dimethysulfoside, acetonitrile, water, etc. Surfactants used for emulsification, dispersion, wet layer, etc. include Teha, alkyl sulfate salts, alkyl (aryl) sulfonates, dialkyl sulfosuccinates, polyoxyethylene alkylaryl ether phosphate salts,
Examples include anionic surfactants such as naphthalene sulfonic acid formalin condensate, nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene block copolymer, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, etc. .

As formulation adjuvants, lignin sulfonate, alginate, polyvinyl alcohol, gum arabic, CMC
(carboxymethylcellulose) PAP (isopropyl acid phosphate), etc.

Next, formulation examples of the composition of the present invention will be shown. The department is Juho Department.

Formulation Example 1 20 parts of Compound A, 825 parts of Compound, 8 parts of calcium lignosulfonate, 2 parts of sodium lauryl sulfate, and 60 parts of synthetic hydrated 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, 11 parts of CMC, and 6 parts of water
A suspension is obtained by mixing 9 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, 88 parts of Compound, 86 parts of kaolin clay, and 10 parts of talc are thoroughly ground and mixed to obtain a powder.

These preparations are sprayed directly or diluted with water. Furthermore, by mixing it with other fungicides, it can be expected that the bactericidal efficacy will be further enhanced. 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.
00f, preferably 1 to 100N, and when applying an emulsion, wettable powder, suspension, solution, etc. diluted with water, the applied concentration is 0.005 to 0.5%, preferably 0, O1
~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: 80 tt per section in a field where paddy rice (Zennanfu) was mechanically transplanted. ,
Eight replicate test plots were set up and cultivation management was carried out as usual. Rice sheath blight bran cultured in rice hull culture was uniformly spread over rice fields.

At the appropriate time when the sheath blight had risen on the foliage, the following powder prepared according to Formulation Example 8 was sprayed twice to ensure sufficient adhesion to the leaf surface.

88 days after the final spraying, the disease rate was investigated for 60 plants in each area. The results are shown in Table ts1.

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 earlier, a suspension of Pseudomonas glumae with a spore concentration of about 10 (14/ml) was inoculated by spraying at 150 per 10 ares. The following powder prepared in the same manner was sprayed so as to sufficiently adhere to the leaf surface.

Two weeks after the final spraying, the ears of 11×80 plants were investigated for the degree of disease onset according to the following investigation criteria.

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

Table 2 (10 complete)

Claims (1)

[Claims] It is characterized by containing 1-ethyl-1,4-dihydro-6,7-methylenedioxy-4-oxo-3-quinolinecarboxylic acid and 3'-isopropoxy-2-methylbenzanilide as active ingredients. A disinfectant composition.