JPH08198710A - Soil disease control agent - Google Patents

Abstract

(57) [Summary] [Purpose] Soil diseases that have become a problem in the cultivation of various crops-seedling wilting of Brassicaceae vegetables, plant rot, root-knot disease, potato black blight, scab etc.- At the same time, provide a control agent. [Structure] 2 ', 4-dichloro-α, α, α-trifluoro-4'-nitro-m-toluenesulfonanilide and 3'-isopropoxy-2-methylbenzanilide, α, α, α-tri Fluoro-3′-isopropoxy-O-toluanilide, 1- (4-chlorobenzyl) -1
-A soil disease controlling agent, comprising at least one selected from the group of cyclopentyl-3-phenylurea and the antibiotic validamycin as an active ingredient.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention is intended to control diseases of various crops in crop cultivation and to grow healthy crops.
2 ', 4-dichloro-α, α, α-trifluoro-4'
-Nitro-m-toluene sulfone anilide and 3'-isopropoxy-2-methylbenzanilide, α, α, α
-Trifluoro-3'-isopropoxy-O-toluanilide, 1- (4-chlorobenzyl) -1-cyclopentyl-3-phenylurea and at least one selected from the group of the antibiotic validamycin as an active ingredient The present invention relates to a soil disease control agent.

[0002]

2. Description of the Related Art Conventionally, one of the major obstacles to cultivating crops is disease of crops. Among the diseases, most of the soil diseases caused by soil pathogenic bacteria are problematic as difficult-to-control diseases, and the damage tends to be more and more widened by continuous cropping by crop cultivation. Methyl bromide, chloropicrin, etc. have been conventionally used as agents for controlling these soil diseases, but special attention must be paid to the safety during use due to the nature of the gas agent and the toxicity. In addition, it is necessary to cover with a plastic film to prevent gas volatilization, and the working method is very complicated, and after the chemical treatment, in order to prevent chemical damage, 7 to 2
There are many disadvantages in terms of cost, such as the inability to plant crops for more than 0 days. Since the density of microorganisms in the soil decreases after sterilization, it is ineffective against reinfection of disease and once infected, there is a risk of further promoting disease outbreak. 3′-isopropoxy-2-methylbenzanilide, α, α, α-trifluoro-3′-isopropoxy-O-toluanilide as a seed treating agent against black blight of potato infected by infected seeds, 1 −
(4-Chlorobenzyl) -1-cyclopentyl-3-phenylurea, antibiotics such as validamycin, etc. are used. For potato scab, streptomycin, oxytetracycline, etc.
Alternatively, inorganic copper agents such as copper chloride are used, but none of them have sufficient control effects or are liable to cause chemical damage under the present circumstances. Furthermore, when cultivating potatoes, various lesions due to Streptomyces spp. Other than the above-mentioned diseases are formed on the surface of the harvested tubers, which may significantly reduce the commercial value. The effects of the above agents on formation cannot be expected.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a plant disease controlling agent which overcomes the drawbacks of the above-mentioned conventional agents. In other words, there is no phytotoxicity in the process of cultivating crops, it is possible to control multiple diseases that infect the same crop, and by using the control agent, a soil with high commercial value can be obtained. A disease control agent is provided.

[0004]

Means and Actions for Solving the Problems As a result of intensive studies conducted by the present inventors to solve the above-mentioned drawbacks,
2 ', 4-dichloro-α, α, α-trifluoro-4'
The present invention has been completed by finding an unpredictable excellent disease control effect by mixing -nitro-m-toluenesulfoneanilide and a certain fungicide. That is, the present invention relates to 2 ', 4-dichloro-α, α, α-trifluoro-4'-nitro-m-toluenesulfonanilide (hereinafter referred to as compound A) and 3'-isopropoxy-.
2-methylbenzanilide (hereinafter referred to as compound B),
α, α, α-trifluoro-3′-isopropoxy-O
-Toluanilide (hereinafter referred to as compound C), 1- (4-
It is characterized by containing at least one selected from the group of chlorobenzyl) -1-cyclopentyl-3-phenylurea (hereinafter referred to as compound D) and the antibiotic validamycin (hereinafter referred to as compound E) as an active ingredient. It is a soil disease control agent.

Compound A is a compound known as an agricultural fungicide and described in Japanese Patent Publication No. 6-27113, and it is mainly effective against root-knot disease, potato scab, etc. of cruciferous crops. Has been described. Compounds B, C, D and E are known compounds as agricultural fungicides (Agricultural Handbook, 1992 edition, published by Japan Plant Protection Association) and are described as effective against various diseases of crops. .

[0006] The soil disease control agent of the present invention not only exhibits the original control effect of each compound contained in the agent, but also when the soil disease control agent of the present invention is used as a disease control agent for rapeseed vegetable cultivation. Shows a remarkable synergistic effect against various soil diseases such as seedling blight. In addition, by performing seed treatment with the soil disease control agent of the present invention in potato cultivation, including the diseases caused by seed transmission such as black blight or scab, commercial value such as scabies and turtle shell disease It is also possible to suppress symptoms that significantly reduce

The expression of a synergistic effect by mixing two or more kinds of compounds in this way brings about efficiency and economic effects by simultaneous control of several diseases, and makes it possible to reduce the application amount of each component. In addition, it is preferable in terms of safety such as environmental pollution.

The soil disease controlling agent of the present invention may be applied to plants alone without adding any components, but it may be mixed with a carrier including a liquid or solid diluent, and further an auxiliary agent. It is preferable to apply it in the form of preparations such as powder, fine granules, granules, wettable powders, emulsions and flowables.

Each formulation has a content of the active ingredient in the formulation of 0.1 to 99% by weight, preferably 0.2 to 80%, and compound A and B, C, D or E The mixing ratio by weight is 1: 1 to 1: 200, preferably 1: 1 to 1: 5.
It is in the range of 0. The above-mentioned carrier means an inorganic or organic substance that is added to help the components reach the site to be treated and facilitate the storage, transportation and handling of the soil disease controlling agent of the present invention. .

Suitable liquid carriers include alcohols such as methanol, ethanol, propanol and ethylene glycol; ethers such as dioxane and tetrahydrofuran; ketones such as acetone and methyl ethyl ketone; aromatic hydrocarbons such as toluene, xylene and cumene. Paraffin hydrocarbons such as kerosene and mineral oil; vegetable oils such as soybean oil, castor oil and cottonseed oil; dimethylformamide, dimethyl sulfoxide, water and the like. Suitable solid carriers include clays such as montmorillonite and kaolinite; diatomaceous earth, clay, talc, vermiculite, gypsum, calcium carbonate, silica gel and the like.

Further, in order to enhance the efficacy as a plant disease controlling agent, the following auxiliary agents are used alone or in combination depending on the purpose in consideration of the dosage form of the preparation, the scene of application and the like. You can also For the purpose of emulsification, dispersion, spreading, wetting, binding, stabilization, etc., such as lignin sulfonate, alkylbenzene sulfonate, alkyl sulfates, polyoxyalkylene alkyl sulfate, and polyoxyalkylene alkyl phosphate salt. Anionic surfactant, polyoxyalkylene alkyl ether, polyoxyalkylene alkyl aryl ether, polyoxyalkylene alkyl amine, polyoxyalkylene alkyl amide, polyoxyalkylene alkyl thioether, polyoxyalkylene fatty acid ester, glycerin fatty acid ester, sorbitan fatty acid ester, Nonionic surfactants such as polyoxyalkylene sorbitan fatty acid ester and polyoxypropylene polyoxyethylene block polymer, stearic acid Siumu, lubricants such as wax, stabilizers such as isopropyl hydroperoxide diene phosphate, other cellulose, carboxymethyl cellulose, casein, gum arabic, and the like. However, these components are not limited to those described above.

When the soil disease controlling agent of the present invention is applied as a soil treating agent, the amount of active ingredient is usually 50 g to 5,000.
g / 10a, preferably 200 g to 2,000 g / 10
The application amount of a is appropriate, and when applied as a seed treatment agent, the amount of the active ingredient is usually 2 mg to 5 mg per 1 kg of seeds.
An application rate of 00 mg, preferably 10 mg to 200 mg, is suitable. The application rate varies depending on the formulation type, and also varies depending on the application timing, method, place, type of plant disease, type of crop, degree of growth and the like. Further, if necessary, it is possible to mix and simultaneously use with other fungicides, insecticides, herbicides, agricultural chemicals such as plant growth regulators, soil conditioners or fertilizers. Examples of diseases for which the composition of the present invention is effective include seedling wilting of cruciferous vegetables, root-knot disease, black blight of potato, scab, and the like, and the commercial value of potato is reduced. Diseases, such as turtle shell disease, can also be suppressed.

[0013]

EXAMPLES The present invention will now be described with reference to examples and test examples, but the present invention is not limited to these examples. "Parts" in the examples represent "parts by weight". Example 1 Dust Compound A: 0.1 part, compound B: 1.0 part, calcium carbonate: 60 parts, clay: 38.4 parts, sodium dodecylbenzenesulfonate: 0.5 parts were uniformly pulverized and mixed. A powder with 1.1% of active ingredient was obtained.

Example 2 Dust Powder Compound A: 0.1 part, Compound E: 0.3 part, Calcium carbonate: 70 parts, Clay: 29.1 parts, Polyethylene glycol: 0.5 part were uniformly pulverized and mixed. Active ingredient 0.4
% Powder was obtained.

Example 3 Wettable powder Compound A: 4.0 parts, Compound C: 50 parts, diatomaceous earth:
35 parts, white carbon: 8 parts, and sodium alkylbenzenesulfonate: 3 parts were uniformly pulverized and mixed to obtain a wettable powder of 54% of the active ingredient.

Example 4 Floating Agent Compound A: 5.0 parts, Compound D: 25 parts, Sodium lignin sulfonate: 10 parts, Carboxymethyl cellulose: 10 parts, Water: 50 parts Wet-milled uniformly to obtain active ingredient 30. % Of the flowable agent was obtained.

Example 5 Granules Compound A: 0.5 part, Compound C: 10 parts, sodium lignin sulfonate: 3 parts, sodium dialkyl succinate: 1 part, talc: 30 parts, bentonite: 55.5 parts After uniformly crushing and mixing, add an appropriate amount of water and knead,
It was granulated and dried using an extrusion granulator to obtain 10.5% granules.

Test Example 1 Control test of Chinese cabbage seedling wilting disease (Rhizoctonia)
1 kg of soil contaminated with solani) was added with a predetermined amount of the dust preparation prepared according to Example 2 and mixed well, and then packed in a unglazed pot with a diameter of 15 cm, and Chinese cabbage (variety:
30 Musou seeds were sown and grown in a greenhouse. Two weeks after sowing, the plant withering symptoms were observed and evaluated. The control rate was calculated by the following formula (Equation 1). The test was performed by repeating 3 pots.

[0019]

[Equation 1]

Further, the synergistic effect of the soil disease controlling agent of the present invention was examined by the following method. Compound A and compounds B, C, D,
Or a simple additive effect E expected when E is mixed
_C is represented by the following formula (Equation 2) (pesticide experiment method, fungicide edition, p. 52, Soft Science).

[0021]

[Equation 2] E _C : Control rate (%) expected when compound A and compound B, C, D, or E are mixed at treatment amounts p and q, respectively E _A : When the treatment amount of compound A is p percent control (%) E _n: compound B, percent control when C, D or throughput of E, is q (%)

When the control rate obtained by the test shows a value larger than the expected effect E _C , there is a synergistic effect.
The results are shown in Table 1 (Table 1), Table 2 (Table 2), Table 3 (Table 3), and Table 4 (Table 4).

[0023]

[Table 1]

[0024]

[Table 2]

[0025]

[Table 3]

[0026]

[Table 4]

Test Example 3 Control test for potato black blight and potato scab The potato (variety: Mequine) harvested from a field contaminated with potato black blight and potato scab
Was used as a seed potato. The wettable powder prepared according to Example 3 was diluted with water to a predetermined concentration, and the seed potatoes were immersed for about 10 seconds,
After air-drying, it was cut into an appropriate size and planted in a field without a history of the above-mentioned diseases. Approximately 100 days after planting, the tubers were dug up, and the degree of lesions of potato black blight and potato scab that were formed on the surface of the tubers of 50 g or more were observed and evaluated. The test area is 90 cm wide and 4 m long (2
0 plants / district), 3 wards system. The evaluation criteria and the method of calculating the disease degree and the control rate are as follows (Equations 3 and 4). The results are shown in Table 5 (Tables 5 and 6).

Potato scab disease degree 0: No symptom 1: Lesion area rate 5% or less 2: Lesion area rate 5% to 25% 3: Lesion area rate 26% or more Potato black blight disease degree 0 : No symptom 1: 1 to 3 / tubercule lesions 2: 4 to 7 / tuber lesions 3: 8 or more / tuber lesions

[0029]

(Equation 3) Where n _{3 is the} number of tubers with the degree of disease 3 n _{2 is the} number of tubers with the degree of disease 2 n _{1 is the} number of tubers with the degree of disease 1 n _{0 is the} number of tubers with the degree of disease 0

[0030]

[Equation 4]

[0031]

[Table 5]

[0032]

[Table 6]

[0033]

Effect of the Invention 2 ', 4-dichloro-α, α, α-trifluoro-4'-nitro-m-toluenesulfonanilide, 3'-isopropoxy-2-methylbenzanilide, α, α, α- Trifluoro-3'-isopropoxy-O-toluanilide, 1- (4-chlorobenzyl) -1
-Compared to cyclopentyl-3-phenylurea or the antibiotic validamycin applied alone,
2 ', 4-dichloro-α, α, α-trifluoro-4'
When -nitro-m-toluenesulfonanilide was mixed with the above-mentioned bactericide, an excellent disease control effect was shown at a lower dose, and clearly a synergistic effect by mixing two kinds of drugs was observed. Up to now, in order to control various diseases in cultivating crops, a method using a gas agent such as chlorpicrin, or actually there is no suitable control method, it was not possible to control the occurrence of the disease, the present invention By using the soil disease controlling agent, it became possible to control the disease more easily and completely.

Front Page Continuation (72) Inventor Kiyoo Miyazaki 1144 Togo, Mobara-shi, Chiba Mitsui Toatsu Chemical Co., Ltd.

Claims (1)

[Claims] 1. 2 ′, 4-Dichloro-α, α, α-trifluoro-4′-nitro-m-toluenesulfonanilide and 3′-isopropoxy-2-methylbenzanilide, α, α, α. -Trifluoro-3'-isopropoxy-O-toluanilide, 1- (4-chlorobenzyl) -1
-A soil disease controlling agent, comprising at least one selected from the group of cyclopentyl-3-phenylurea and the antibiotic validamycin as an active ingredient.