JPS625905A - 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 pencycuron and capable of controlling bacterial grain rot and sheath blight of rice plants which are not readily controlled simultaneously without environmental pollution. CONSTITUTION:A germicidal composition containing 1-ethyl-1,4-dihydro-6,7- methylenedioxy-4-oxo-8-quinolinecar-boxylic acid and pencycuron as an active constituent. When the above-mentioned composition is used for controlling plant blights, it may be directly used, but normally is mixed with a solid carrier, liquid carrier, surfactant, etc., and formulated into an emulsion for use. In this case, the mixing weight ratio of the former compound and the latter pencycuron which are an active constituent is 1:0.2-1:10, preferably 1:0.5-1:5, and the content of the active constituent in the formulation is 0.1-99wt%, preferably 1-90wt%.

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 pencyclone (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 (increasingly occurring throughout the country and decreasing yields). Problems have arisen, such as a significant decrease in

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 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.

In addition, the other active ingredient, Compound B, is known to be an excellent fungicide against rice blight.
It does not show any control effect against 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 brings 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. By doing so, it is preferable in terms of safety and 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 II/7'' alcohol, and cellulose, and ketones such as acetone, cyclohexanone, and isophorone. , vegetable oils such as soybean oil and cottonseed oil, sulfoxide, acetonitrile, water, etc. Surfactants used for emulsification, dispersion, wet carbon, etc. include alkyl sulfate ester salts, alkyl (aryl) sulfones, etc. acid salts, dialkyl sulfosuccinates, polyoxyethylene alkylaryl ether phosphate ester salts, anionic surfactants such as naphthalene sulfonic acid formalin condensates, polyoxyethylene alkyl ethers, polyoxyethylene polyoxypropylene block copolymer, sorbitan Examples include nonionic surfactants such as fatty acid esters and polyoxyethylene sorbitan fatty acid esters.As formulation aids, lignin sulfonates, alginates, polyvinyl alcohol, gum arabic, CMC (carboxymethyl cellulose), PAP ( acidic isopropyl 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 10 parts of Compound A, 15 parts of Compound B, 8 parts of polyoxyethylene sorbitan monooleate, 5 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, 1.6 parts of compound B, 87 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. 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.
009. Preferably it is 1-toor, and when applying emulsions, wettable powders, suspensions, solutions, etc. diluted with water, the application concentration is 0.005-0.5%, preferably 0.01-0.
It is 0.2% and powders etc. are applied as is without any dilution.

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

Test Example 1 Rice sheath blight control effect test Paddy rice (Zennanfu) was mechanically transplanted into a field with 80#/80
Repeated test plots were set up and culture management was carried out as usual. Rice sheath blight, wheat bran, and rice hull culture culture were uniformly spread over rice fields.

At an appropriate time when sheath blight had risen on the tree body, 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 incidence rate was investigated for 50 plants in each area. The results are shown in Table 1.

1. One section is 20m long in a field where paddy rice (Asominori) was mechanically transplanted.
Eight replicate test plots were set up, and culture management was carried out as usual. Inoculation is carried out two weeks before heading with approximately 1θ spores/ns 1 spore wave of rice blight disease fungus (pseudomonas g).
lumae) suspension was inoculated at 1601 sprays per 10 ares. A powder in the latter half of the season, prepared according to Formulation Example 8, was sprayed twice, at the ear opening stage and at the panicle set 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 pencycurone as active ingredients.