JPH04368305A - Fungicidal composition for agriculture and horticulture - Google Patents

Abstract

PURPOSE:To obtain an economic insecticidal composition for agriculture and horticulture, having synergistic effects, a reduced application amount and high safety to environment, comprising an agent of mixed three active ingredients. CONSTITUTION:A flowable agent, granular wettable powder or wettable powder granule comprising tetrachloroisophthalonitrile, a phenylamide-based fungicidal compound and cymoxanil or fosetyl as active ingredients and 1mum-3mum average particle diameter of particle size distribution of the solid component thereof when the solid component is dispersed into 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 broaden 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 ( Mixed fungicides with benomyl (generic name: Benomyl) are used. On the other hand, phenylamide-based fungicidal compounds have excellent control effects on downy mildew and late blight, which cause great damage to fruit trees and vegetables. It is known to act on pathogenic bacteria that have invaded tissues, preventing the spread of disease. Regarding phenylamide fungicidal compounds, various fungicidal mixtures, such as mixed fungicides with basic copper chloride, mancozeb, and TPN, are used with the aim of broadening the bactericidal spectrum and countering resistant bacteria.

[0003] Cymoxanil also shows high control over downy mildew and late blight that cause damage to fruit trees and vegetables. Fosetyl is a systemic fungicide and is known to be particularly effective against downy mildew.

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. On the other hand, phenylamide fungicidal compounds exhibit high control effects only against late blight and downy mildew fungi, but have little efficacy against other pathogenic fungi. Continuous spraying also has a high possibility of developing drug-resistant bacteria, which limits the number of times it can be used, and under conditions where bacteria resistant to phenylamide-based fungicides develop, there are cases where efficacy is low. Cymoxanil and fosetyl exhibit a control effect against both phenylamide-sensitive bacteria and resistant bacteria, but their efficacy against susceptible bacteria is clearly inferior to that of phenylamide-based fungicides.

[0005] 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.

[0006] An object of the present invention is to overcome the drawbacks of each agent by mixing three types of agents, and to provide a fungicidal composition for agriculture and horticulture that has excellent properties at a low dose.

[0007]

[Means for Solving the Problems] As a result of extensive research in order to solve the above problems, the present inventor has developed a method that contains three types of compounds as active ingredients: TPN, a phenylamide fungicidal compound, and cymoxanil or fosetyl. , when the particle size distribution of the solid component is dispersed in water, the average particle size is 1 μm.
A fungicidal composition for agricultural and horticultural use, which has a particle size in the range of 3 μm to 3 μm and is in the form of a flowable formulation, a wettable powder, or a wettable tablet, which combines the excellent characteristics of each compound,
Surprisingly, the present inventors have discovered that they have a strong synergistic bactericidal effect against bacteria resistant to phenylamide-based bactericidal compounds, and that safety for users is significantly improved, leading to the completion of the present invention.

[0008] There are no particular limitations on the method for producing the sterilizing 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 pulverizers include ball mills, impact pulverizers, jet pulverizers, wet pulverizers, and the like.

[0009] Antifreeze agents, suspension stabilizers, decomposition inhibitors, colorants, odorants, bittering agents, and the like can be added to the flowable preparations as necessary.

[0010] When producing wet powder powders or water-dispersible tablets, they can be produced by conventional blending using conventional crushers and granulators. These pulverizers include ball mills, impact pulverizers, jet pulverizers, wet pulverizers, and the like.

[0011] 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. A disintegrating agent, a decomposition inhibitor, a coloring agent, a flavoring agent, a bittering agent, etc. can be added to the hydrated granules and the hydrated tablet as necessary.

[0012] The content of the active ingredients consisting of TPN, phenylamide fungicidal compound, and cymoxanil or fosetyl in the composition of the present invention is not particularly limited, but is in the range of 1% to 98%.

Examples of the phenylamide fungicidal compounds used in the present invention include metalaxyl, benalaxyl, furalaxyl, and oxadixyl, with metalaxyl and oxadixyl being preferred.

The content ratio between TPN and the other two compounds is preferably such that when the phenylamide fungicidal compound is 1, TPN is 3 to 10, and cymokionyl is 0.1 to 1, or TPN is 1 to 1. is 4 to 6, and fosetyl is 4 to 6.

[0015]

[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 Each component was mixed in the proportions shown in Table 1 and ground using a wet grinder to produce a flowable agent. The particle size distribution of the solid component can be adjusted to an average particle size of 2μ by adjusting the grinding time.
It was set as m.

[0017]

[Table 1]

Example 2 The components were mixed in the proportions shown in Table 2, crushed using a jet crusher, and molded using a tablet machine to produce wettable tablets. The particle size distribution of the solid component when dispersed in water was adjusted to an average particle size of 2.5 μm by adjusting the air pressure during crushing.

[0019]

[Table 2]

Example 3 Each component was mixed in the proportions shown in Table 3, pulverized using a jet pulverizer, and granulated using a fluidized bed granulation dryer to produce a granular wettable powder. The particle size distribution of the solid component when dispersed in water was adjusted to an average particle size of 2.5μ by adjusting the air pressure during crushing.
It was set as m.

[0021]

[Table 3]

[0022]

[Action] In the case of a three-part mixture of TPN, a phenylamide-based bactericidal compound, and cymoxanil or fosetyl, the bactericidal spectrum is broadened, and it has both preventive and therapeutic effects, and is extremely effective against resistant bacteria. have

[0023] Furthermore, the present invention has a particle size of 1 μm to 3 μm.
m, the dispersibility is greatly improved compared to conventional wettable powders, and the drug is evenly distributed on the leaf surface, resulting in a significant improvement in efficacy, 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 work extremely efficiently,
The pest control effect is improved. 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] In addition, hydrated granules or hydrated tablets produce less dust and are highly safe for users, can be prepared in different volumes, and are 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, etc. Potato: Phytophthora, summer blight, black spot, etc. Soybean: Downy mildew, spot, brown spot, sclerotium, rust, purpura, etc. Azuki: brown spot, rust, soot spot, udon Mildew, etc. Peanuts: Brown spot, black astringency, sclerotinia, etc. Tobacco: Akaboshi, Phytophthora, sclerotinia, sclerotinia, soybean, white spot, powdery mildew, etc.Beet: Downy mildew, brown spot Diseases, seedling blight, etc. Tomato: Botrytis, leaf mold, late blight, sclerotium, ring spot, sooty mold, wilt, seedling blight, etc. Eggplant: Botrytis, 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, etc. Chinese cabbage: downy mildew diseases, white spot, sclerotium, clubroot, soft rot, etc. Onion: white blight, downy mildew, gray rot, anthracnose, etc. Lettuce: downy mildew, gray mold, brown spot, sclerotium 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 disease, scabrous blight, monilia disease, powdery mildew, etc. Pears: Fusarium blight, black spot, scabrous disease, etc. Peach: Fusarium blight, scoliosis, leaf curl disease, etc. Grapes: Mildew, gray mold, brown spot, black rot, late rot, rust, vine blight, vine split, powdery mildew, etc.

00
28] Representative test examples will be shown below to specifically explain the effects of the composition of the present invention. However, these are merely examples, and it goes without saying that the application examples of the present invention are not limited to these.

Test Example 1 Potato Phytophthora control test A chemical solution diluted to a predetermined concentration was sprayed on potted potatoes (variety: Danshaku) so that it sufficiently adhered to the leaf surface, and two days later, potato late blight (Phytophthora i) was infected.
The cells were inoculated by spraying with a zoospore suspension of A. nfestans). After this was left in an inoculation chamber at 21° C. for 2 days, the degree of disease onset was investigated as follows.

[0030] 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%

[0031]

[Math 1]

[0032]

[Math 2]

[0033] The EC90 value was calculated from the control value, and the results are shown in Tables 4 and 5.

[0034]

[Table 4]

[0035]

[Table 5]

Test Example 2 Cucumber Downy Mildew Control Test 2
A chemical solution diluted to a predetermined concentration was sprayed on cucumbers in the leaf stage (variety: Tokiwa Hikari No. 3 P type) so as to sufficiently adhere to the leaf surface. After 4 days, cucumber downy mildew (Pseudoperonosp) was sprayed.
ora cubensis) was spray inoculated with a zoospore suspension. This was kept in an inoculation chamber at 21° C. for 2 days, and then left in a greenhouse for 2 days. Five days after inoculation, the lesion areas on the first and second true leaves were investigated according to the following criteria. The method for calculating the disease severity and control value is the same as in Test Example 1. The results are shown in Tables 6 and 7.

[0037]

[Table 6]

[0038]

[Table 7]

The synergistic effect index (SF) is calculated by the following formula, and when it is greater than 1.5, it indicates that there is a synergistic effect.

[0040]

[Math 3]

SF=EC90 (theoretical value) ÷ EC90 (measured value) (wherein, X, Y, and Z are active ingredients a, b,
The content ratio of c is shown. )

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

Claims (4)

[Claims] Claim 1: Contains three types of compounds as active ingredients, including tetrachloroisophthalonitrile and phenylamide fungicidal compounds plus cymoxanil or fosetyl, and the particle size distribution of the solid components is such that when dispersed in water, the average particle size is A sterilizing composition for agriculture and horticulture, which has a diameter in the range of 1 μm to 3 μm, and is in the form of a flowable formulation, a granule wettable powder, or a wettable tablet. 2. Tetrachloroisophthalonitrile, a phenylamide fungicidal compound, and cymoxanil as active ingredients, and a phenylamide fungicidal compound by weight of 1
%, tetrachloroisophthalonitrile is contained in a ratio of 3 to 10 parts and cymoxanil is 0.1 part to 1 part, and the particle size distribution of the solid component is such that when dispersed in water, the average particle size is A sterilizing composition for agricultural and horticultural use, which has a particle size in the range of 1 μm to 3 μm and is in the form of a flowable formulation, a granule wettable powder, or a wettable tablet. 3. Tetrachloroisophthalonitrile, a phenylamide fungicidal compound, and fosetyl are used as active ingredients, and when the phenylamide fungicidal compound is 1 part by weight, tetrachloroisophthalonitrile is 4 to 6 parts, and fosetyl is 1 part by weight. is contained in a ratio of 4 parts to 6 parts, and the particle size distribution of the solid component is in the range of 1 μm to 3 μm in average particle size when dispersed in water, and A disinfectant composition for agricultural and horticultural use, characterized in that it is a compatible tablet. 4. Claims 1 to 3, wherein the phenylamide fungicidal compound is metalaxyl or oxadixyl.
A disinfectant composition for agricultural and horticultural use.