JPS625904A - Germicidal composition - Google Patents

Abstract

PURPOSE:A germicidal composition, containing 1-ethyl-1,4-dihydro-6,7- methylenedioxy-4-oxo-8-quinolinecar-boxylic acid and validamycin as an active constituent and effective against bacterial grain rot and sheath blight of rice plants. CONSTITUTION:A germicidal composition containing 1-ethyl-1,4-dihydro-6,7- methylenedioxy-4-oxo-8-quinolinecar-b-oxylic acid and validamycin at 1:0.2-1:10, preferably 1:0.5-1:5 weight ratio as an active constituent in an amount of 0.1-99.9wt%, preferably about 1-90wt% in a formulation. The incorporation of the two kinds of the compounds is preferred for not only improving the efficiency and economic advantage by the simultaneous control of two kinds of blights but also making it possible to reduce the amount of the respective components to be applied thereby, the composition is preferred for aspects of environmental pollution, safety, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to the use of 1-ethyl-1,4-dihydro-6,7-methylenedioxy-4-oxo-8-quinolinecarboxylic acid (hereinafter referred to as compound A) and validamycin (hereinafter referred to as compound A). , 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 significant decrease are occurring.

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

The inventors of the present invention were concerned with these points, and as a result of intensive research into the development of a fungicide that has a broad spectrum and is capable of controlling rice blight, which is extremely difficult to control, the above-mentioned book was developed. It was discovered that the composition of the invention is a powerful and versatile fungicidal composition that is not only highly effective against rice bacterium blight but also in controlling sheath blight. reached.

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

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 two types of compound components not only has efficiency and economic benefits by simultaneously controlling two types of diseases, but also reduces the application amount of each component. It 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 this case, the mixing ratio of compound A and compound B, which are active ingredients, is 1:0.2 to 1:10°, preferably 1:0.5 to 1:5, by weight, and The active ingredient content 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 cerolable, ketones such as acetone, cyclohexanone, isophorone, etc. Examples include vegetable oils such as soybean oil and cottonseed oil, dimethanotalphooxide, acetonitrile, water, etc. Surfactants used for emulsification, dispersion, wet carbon, etc. include alkyl sulfate ester salts, alkyl (aryl) sulfonates, Anionic surfactants such as dialkyl sulfosuccinates, polyoxyethylene alkylaryl ether phosphate ester salts, Natsuta 1.-nsulfonic acid formalin condensates, polyoxyethylene alkyl ethers, polyoxyethylene polyoxypropylene block copolymers, sorbitan fatty acids Examples include nonionic surfactants such as esters and polyoxyethylene sorbitan fatty acid esters.As formulation aids,
Examples include lignin sulfonate, alginate, polyvinyl alcohol, gum arabic, CMC (carboxymethylcellulose), and PAP (isopropyl acid phosphate).

Next, formulation examples of the composition of the present invention will be shown. In addition, the part is the rousing part.

Formulation Example 1 20 parts of Compound A, 810 parts of Compound, 8 parts of calcium lignosulfonate, 2 parts of sodium lauryl sulfate, and 66 parts of synthetic hydrated silicon oxide are thoroughly ground and mixed to obtain a wettable powder.

Formulation Example 2 10 parts of Compound A, 8115 parts of Compound, 8 parts of polyoxyethylene sorbitan monooleate, 69 parts of water, CMCa part, and 69 parts of water were mixed and wet-pulverized until the particle size of the active ingredient became 5 microns or less to form a suspension. get.

Formulation Example 8 1 part of compound A, 8018 parts of compound, 88 parts of kaolin clay
．． 7 parts and 10 parts of talc are thoroughly ground and mixed to obtain a powder.

These preparations are sprayed on grass as is 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.
00 f, preferably 1 to 1 ooy, and when applying an emulsion, wettable powder, suspension, solution, etc. diluted with water, the application concentration is 0.005 to 0.5%, preferably 0.00 f. 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 One section 80m', 8
Repeated test plots were set up and culture management was carried out as usual. Rice sheath blight bran cultured in rice hull culture was uniformly spread over rice fields.

At an appropriate time when sheath blight had risen on the fence, the following powder prepared according to Formulation Example 8 was sprayed twice so that it would sufficiently adhere 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 1.

1st section 20# / 1 section in the field where the surface paddy rice (Asominori) was mechanically transplanted
, 8 replicate test plots were set up, and culture management was carried out as usual. Inoculation is carried out two weeks before heading with a spore concentration of approximately lθ spores/ml.
mae) suspension was inoculated with 1501 IyJI per 10 ares. 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] A sterilizing composition comprising 1-ethyl-1,4-dihydro-6,7-methylenedioxy-4-oxo-3-quinolinecarboxylic acid and validamycin as active ingredients.