JPH04257502A - Fungicidal composition for agricultural and horticultural use - Google Patents

Abstract

PURPOSE:To obtain an economical fungicidal composition for agricultural and horticultural use, having synergistic effect, effective at a decreased rate of application and having high safety to environment by mixing two or more kinds of active components. CONSTITUTION:The objective fungicidal composition is a flowable preparation, wettable granule or wettable tablet containing (A) tetrachloroisophthalonitrile and (B) at least one kind of compound selected from hydrated sulfur, procymidone, dimethomorph, streptomycin and polyoxin as active components. The particle size distribution of the solid component is 1-3mum in a state dispersed in water.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fungicidal composition for agricultural and horticultural use, and more particularly to a fungicidal composition for agricultural and horticultural use that has an improved effect on controlling plant diseases.

0002

BACKGROUND OF THE INVENTION Bactericidal agents containing tetrachloroisophthalonitrile (hereinafter referred to as TPN) as an active ingredient have been put to practical use as agents with strong protective and bactericidal effects. In particular, it is widely used as an agricultural and horticultural fungicide for the purpose of controlling diseases of fruit trees and vegetables by spraying it on plants or mixing it with soil.It has a wide bactericidal spectrum and has an extremely low possibility of developing resistant bacteria. In addition, in order to widen the fungicidal spectrum and enable simultaneous control, mixed fungicides of TPN and other fungicidally active compounds, such as methyl 3-(butylcarbamoyl)-3H-benzimidazol-2-yl carbamate (common name A mixed fungicide with Benomyl (benomyl) is used.

On the other hand, hydrated sulfur is highly effective against powdery mildew on fruit trees and vegetables, procymidone, polyoxin, and dimethomorph have not only preventive but also therapeutic effects on diseases of fruit trees and vegetables, and streptomycin is known to have therapeutic effects on bacterial diseases of fruits and vegetables. However, no practically excellent agent is known that is a mixed fungicidal composition containing at least one of these fungicidally active compounds and TPN.

0004

[Problems to be Solved by the Invention] Bactericidal agents containing TPN as an active ingredient mainly have a preventive effect, and no therapeutic effect can be expected at all. In addition, hydrated sulfur targets only a limited number of diseases and has no therapeutic effect. Procymidone, polyoxin, dimethomorph, and streptomycin may cause drug-resistant bacteria, and the target diseases are limited.

[0005] Mixtures of TPN and hydrating agents of each drug are also known for some drugs, but these have a particle size of 5 μm.
m or more, no synergistic effect can be expected, and the respective drawbacks have not been solved.

[0006] Reducing the amount of administered drugs through efficient use of active ingredients can be expected to provide more environmentally safe and economical drugs. In general, when two or more types of bactericidal active ingredients are mixed and used and they exhibit an additive or synergistic effect, it leads to a reduction in the amount of medicine administered, resulting in an excellent bactericidal composition that combines the effectiveness of both drugs. Become.

An object of the present invention is to overcome the drawbacks of each drug by mixing two or more active ingredients, and to provide a fungicidal composition for agriculture and horticulture that has excellent properties at a low dosage.

[0008]

[Means for Solving the Problems] As a result of extensive research to solve the above problems, the present inventors have developed at least one material selected from TPN, hydrated sulfur, procymidone, dimethomorph, streptomycin, and polyoxin. 1 as an active ingredient, and the particle size when dispersed in water is 1.
The agricultural and horticultural fungicidal composition, which has a particle size of 3 μm and is in the form of a flowable formulation, a hydrated granule, or a hydrated tablet, combines the excellent characteristics of each, has a surprisingly strong synergistic effect, and has a surprisingly strong synergistic effect. The present invention was completed based on the discovery that the safety against

[0009] There are no particular limitations on the method for producing the disinfectant composition of the present invention. It can be manufactured by conventional methods using conventional equipment. For example, when manufacturing a flowable formulation, it can be easily manufactured by using a conventionally used pulverizer and adding surfactants and the like. These crushers include ball mills, impact crushers,
Examples include jet pulverizers and wet pulverizers.

[0010] Antifreeze agents, suspension stabilizers, decomposition inhibitors, colorants, odorants, bittering agents, and the like can be added to the flowable preparations as necessary.

[0011] When producing granular wettable powders or tablet-type wettable powders, conventionally used crushers and granulators are used.
It can be manufactured using common formulations. These pulverizers include ball mills, impact pulverizers, jet pulverizers, wet pulverizers, and the like.

Examples of the granulator include an extrusion granulator, a dish granulator, a spray dryer, a fluidized bed granulator, a rolling granulator, a roller compactor, and a tablet machine.

[0013] If necessary, disintegration aids, decomposition inhibitors, colorants, odorants, bittering agents, etc. can be added to the granular wettable powders and tablet-type wettable powders.

[0014] Furthermore, TPN and hydrated sulfur in the composition of the present invention,
The content of at least one active ingredient selected from procymidone, dimethomorph, streptomycin, and polyoxin is not particularly limited, but is 1% to 9%.
It is desirable to use it at about 8%.

[0015] The content ratio of TPN and other compounds is TP
1:2 to 2:1 for N and sulfur fungicides, 1:1 to 5:1 for TPN and procymidone, 1 for TPN and dimethomorph.
:2 to 5:1, TPN and streptomycin 1:1
1 to 5:1, TPN and polyoxin 1:1 to 5:1
It is.

[0016]

[Examples] Next, formulation examples of the composition of the present invention will be described, but it goes without saying that the invention is not limited thereto.

Example 1 TPN

25 parts hydrated sulfur

25 parts POE nonylphenyl ether 1
Part Sodium ligninsulfonate
5th part
water

44 parts of TPN and hydrated sulfur were mixed with POE nonyl phenyl ether, sodium lignin sulfonate, and water, and ground using a wet grinder. The grinding time was adjusted to form a slurry with an average particle size of 2.5 μm. A flowable sample was made.

Example 2 was mixed, water was added, and the mixture was pulverized using a wet pulverizer. The pulverization time was adjusted to prepare a slurry having an average particle size of 1.5 μm. This slurry was granulated using a spray dryer to prepare a sample of a granular wettable powder.

Example 3 was mixed, a powder with an average particle size of 3 μm was prepared using a jet pulverizer, water was added, and the mixture was granulated using an extrusion granulator and then dried to prepare a sample of a granular wettable powder. .

Example 4 POE nonyl phenyl ether, POE alkyl allyl ether phosphate salt, and water were added to TPN and pulverized using a wet pulverizer, and the pulverization time was adjusted to give an average particle size of 1 μm.
A slurry was prepared, and water in which streptomycin was dissolved was added to achieve the above mixing ratio to prepare a flowable sample.

Example 5 was mixed and pulverized using a wet pulverizer, and the pulverization time was adjusted to prepare a flowable sample having an average particle size of 2 μm.

[0022]

[Action] In the case of a mixture of two or more types of TPN and polyoxin, procymidone or dimethomorph, the bactericidal spectrum is broadened, it has both preventive and therapeutic effects, and is also effective against resistant bacteria. In the case of a two-part mixture of TPN and a sulfur-based fungicide, the spectrum is widened and the residual effect is long. A two-part mixture of TPN and streptomycin is effective against not only filamentous fungi but also bacterial diseases.

[0023] Furthermore, the particle size of the present invention is 1 μm to 3 μm.
By doing so, the dispersibility is greatly improved compared to conventional hydrating agents, and because the drug is evenly distributed on the leaf surface, the efficacy is also greatly improved, and a synergistic effect is observed.

Furthermore, since the composition of the present invention is in the form of a flowable agent, a wettable powder, or a wettable tablet, the following can be considered. Since the flowable agent is already dispersed in the liquid, it is difficult to aggregate in the dilution water, and the optimized particle size can be maintained as it is.There is no need to add other solids as a diluent, so the decomposition effect of solids is reduced. can be avoided. These things allow the active ingredients to act extremely efficiently and improve the pesticidal effect. When actually used, it has excellent dispersibility in water, so it mixes easily with water and makes it easy to prepare a spray liquid. Because of its excellent suspension properties, the prepared chemical solution can remain in a uniform suspended state for a long period of time, and can be sprayed at a predetermined concentration from the start to the end of spraying. Clogging during spraying will no longer be a problem.

[0025] Furthermore, granular wettable powders or tablet wettable powders produce less dust and are highly safe for users, and can be prepared in bulk quantities, making it easy to measure the drug. There is also less adhesion to containers.

[0026]

EFFECTS OF THE INVENTION The composition of the present invention is effective in controlling a wide range of diseases of agricultural and horticultural crops, and the main ones include the following.

Paddy rice: Blast, sesame leaf blight, sheath blight, stupid seedling disease, seedling damping off, etc. Wheat: Fusarium rust, yellow rust, bare smut, leaf blight, brown snow rot, powdery mildew Diseases such as potato: Phytophthora, summer blight, black blight, soft rot, etc. Soybean:
Downy mildew, spot disease, brown spot, sclerotium, rust, purpura, etc. Azuki: brown spot, rust, soot spot, powdery mildew, etc. Peanut: brown spot, black astringent, sclerotia Diseases, etc. Tobacco: Akaboshi, Phytophthora, Sclerotinia, Powdery Mildew, Blight, White Spot, Powdery Mildew, etc.Beet: Downy mildew, Brown spot, Seedling blight, etc. Tomato: Botrytis, Leaf mold Diseases, late blight, sclerotium, ring spot, sooty mold, wilt, seedling blight, etc. Eggplant: gray mold, half-wilt, brown rot, black blight,
Powdery mildew, sooty mold, etc. Cucurbits: downy mildew, gray blight, gray mold, sclerotium, scab, anthracnose, vine blight, powdery mildew, seedling damping off, bacterial spot disease, etc. Chinese cabbage: downy mildew, white spot, sclerotium, clubroot, soft rot, etc. Onion: white late blight, downy mildew, gray rot, anthracnose, etc. Lettuce: downy mildew, gray mold, brown spot , Sclerotinia, etc. Strawberry:
Botrytis, powdery mildew, ring spot, etc. Chrysanthemum: White rust, powdery mildew, etc. Cyclamen: Botrytis, etc. Rose: Scotch, powdery mildew, etc. Citrus: Blue mold, Botrytis, black spot, etc. Mildew, etc. Apple: Fusarium blight, leaf spot, scab, monilia, powdery mildew Pear: scab, black spot, scab, etc. Peach: scab, scab, bacterial borer, leaf curl, etc. Grapes: downy mildew, gray mold, brown spot, black rot, late rot, rust, vine blight, vine split, powdery mildew, etc.

[0028]
Hereinafter, typical test examples will be shown to specifically explain the effects of the composition of the present invention. However, these are just examples;
It goes without saying that the application examples of the present invention are not limited to these.

Test Example 1 Barley powdery mildew control test A chemical solution diluted to a predetermined concentration was sprayed on barley seedlings at the 3rd leaf stage, and after air-drying, barley powdery mildew fungus (Erysiphe) was sprayed.
graminis f. sp. hordei) was inoculated by spraying with a conidial suspension. This was kept in a greenhouse at 20°C, and after 7 days, the degree of disease onset was investigated according to the following criteria.

[0030]

[Math 1] n: Number of leaves by severity of disease f: Index by severity of disease N: Number of leaves examined Index by disease severity 0: Number of lesions 0 1: Number of lesions 1-5 2: Number of lesions 6-10 3: Number of lesions 11-20 4: Number of lesions 21-50 5: Number of lesions: 51 or more

[0031]

[Math 2]

Test Example 2 Cucumber Gray Mold Control Test An amount equivalent to 200 l/10a of a chemical solution diluted to a predetermined concentration was sprayed on potted cucumbers (variety: Yotsuba) at the 3-leaf stage. After air-drying indoors for 24 hours, Botrytis
tis cinerea) conidia under a microscope.
Add commercially available yeast extract (equivalent to 1%) and commercially available glucose (equivalent to 10%) to a suspension prepared at 100 cells per double field of view.
was added and spray inoculated. Immediately after inoculation, the temperature was 22°C.
The specimens were kept under dark conditions with 100% humidity for 3 days, and the degree of disease onset was investigated according to the following criteria.

[0033]

[Math 3] n: Number of leaves by severity of disease f: Index by severity of disease N: Number of leaves examined Index by disease severity 0: Disease area 0% 1: Affected area 1-5% 2: Affected area 6-10% 3: Affected area: 11-25% 4: Disease area: 26-100%

[0034]

[Math 4]

Test Example 3 Potato late blight control test An amount equivalent to 200 l/10a of a chemical solution diluted to a predetermined concentration was sprayed on potted potatoes (variety: Danshaku), and after air-drying,
Phytophthorainfe
The cells were inoculated by spraying with a zoospore suspension of A. stans). After being kept in a humid room at 20°C for 7 days, the degree of disease onset was investigated. The method of calculating the disease severity and control value is in accordance with Test Example 2.

Test Example 4 Control test for Chinese cabbage soft rot disease A predetermined concentration of the chemical was sprayed on potted Chinese cabbage seedlings (12 plants/pot) (variety: Nozaki No. 2), and after air-drying, the Chinese cabbage soft rot fungus (
Carborundum was added to a suspension of Erwinia carotovora for spray inoculation. This was kept in a humid room at 28°C, and after 5 days, the degree of disease onset was investigated according to the following criteria.

[0037]

[Math 5] n: Number of leaves by severity of disease f: Index by severity of disease N: Number of leaves examined Index by disease severity 0: Number of diseased strains 0 1: Number of diseased strains 1 2: Number of diseased strains 2 3: Number of diseased strains 3 4: Number of affected strains: 6 or more

[0038]

[Math 6]

Test Example 5 Control test for apple spot leaf fall disease A chemical solution diluted to a predetermined concentration was sprayed on the unfolded leaves of apple seedlings (variety: Sekai No.
A conidial suspension of P. nata apple pathotype was inoculated by spraying. Place this in a humid room at 27℃ for 2
The plants were kept for 1 day, then transferred to a greenhouse, and 2 days later, the degree of disease onset was investigated. The method of calculating the disease severity and control value is in accordance with Test Example 2.

Next, the test results are shown in the table. The results of Test Example 1 are shown in Table 1, the results of Test Example 2 are shown in Table 2, the results of Test Example 3 are shown in Table 3, the results of Test Example 4 are shown in Table 4, and the results of Test Example 5 are shown in Table 5. It will be done. The calculation was done according to the following formula:

00
41]

[Formula 7] [In the formula, X = active ingredient concentration p, control value Y =
Control value E of compound B at active ingredient concentration q = p+
It represents the expected control value (theoretical value) of compound A+B in the case of q. ] If the observed value is higher than the value E calculated by Colby, the combined mixture has a synergistic effect.

[0042]

[Table 1]

[0043]

[Table 2]

[0044]

[Table 3]

[0045]

[Table 4]

[0046]

[Table 5]

The above test results show that the composition of the present invention has excellent bactericidal efficacy and sufficient synergistic effect.

Claims (5)

[Claims] [Claim 1] Tetrachloroisophthalonitrile;
Contains at least one selected from hydrated sulfur, procymidone, dimethomorph, streptomycin, and polyoxin as an active ingredient, and the particle size distribution of the solid component is in the range of 1 μm to 3 μm when dispersed in water, A fungicidal composition for agriculture and horticulture, which is a flowable preparation, a hydrated granule, or a hydrated tablet. 2. Contains tetrachloroisophthalonitrile and hydrated sulfur as active ingredients in a ratio of 1:2 to 2:1, and the particle size distribution of the solid components is 1:1 when dispersed in water.
A sterilizing composition for agriculture and horticulture, which has a particle size in the range of .mu.m to 3 .mu.m, and is in the form of a flowable preparation, a granule wettable powder, or a wettable tablet. 3. Contains tetrachloroisophthalonitrile and procymidone as active ingredients in a ratio of 1:1 to 5:1, and the particle size distribution of the solid components is in the range of 1 μm to 3 μm when dispersed in water. A disinfectant composition for agricultural and horticultural use, characterized in that it is a flowable formulation, a hydrated granule, or a hydrated tablet. 4. Contains tetrachloroisophthalonitrile and dimethomorph as active ingredients in a ratio of 1:2 to 5:1, and the particle size distribution of the solid component is in the range of 1 μm to 3 μm when dispersed in water. A disinfectant composition for agricultural and horticultural use, characterized in that it is a flowable formulation, a hydrated granule, or a hydrated tablet. [Claim 5] Tetrachloroisophthalonitrile;
Contains either streptomycin or polyoxy as an active ingredient in a ratio of 1:1 to 5:1, and the particle size distribution of the solid component is 1 μm to 3 μm when dispersed in water.
A sterilizing composition for agricultural and horticultural use, which is in the μm range and is in the form of a flowable preparation, a granule wettable powder, or a wettable tablet.