JPH06271412A - Agent for agricultural and horticultural use - Google Patents

Abstract

PURPOSE:To provide an agent for agricultural and horticultural use, having high safety to human body and environment, causing little phytotoxicity and effective on viral diseases. CONSTITUTION:A silver compound such as silver, silver salt, silver complex and silver chelate is used as a main material or at least one of the above silver compound is supported on a porous particulate carrier, the surface of the carrier is coated and the product is used as a main material. The main material is compounded with adjuvants such as surfactant, binder and stabilizer and prepared in the form of wettable powder, emulsifiable concentrate, dust, soluble liquid, etc.

Description

Detailed Description of the Invention

[0001]

The present invention relates to silver as an active ingredient,
The present invention relates to an agricultural and horticultural agent characterized by using a silver compound such as a silver salt, a silver complex salt and a silver chelate.

[0002]

2. Description of the Related Art Many fungicides are used as agricultural and horticultural chemicals. However, the problem of residual pesticides in agricultural products and the environment,
Recently, the problem of environmental pollution due to excessive use at golf courses and the like has been emphasized. However, the phytotoxicity caused by spraying various agricultural chemicals on agricultural and horticultural crops has been a problem. In addition, there were many plant diseases caused by viruses, which was an important problem, but there were no pesticides effective against viral diseases.

[0003]

Therefore, there is a need for a low-toxic pesticide that is safe for the human body, has low environmental pollution, and has low phytotoxicity for sprayed agricultural and horticultural crops.
In addition, effective pesticides against plant viral diseases have been required.

An object of the present invention is to provide an agricultural and horticultural chemical that meets such requirements.

[0005]

The present invention provides silver, which is safe for humans, has little environmental pollution, has low toxicity against agricultural and horticultural crops to be sprayed, and is effective against plant viral diseases. It is intended to provide an agricultural and horticultural agent containing at least one kind of a silver compound such as a silver salt, a silver complex salt and a silver chelate as an active ingredient.

Further, the bactericidal / viricidal agent is a porous particle carrier carrying a silver compound such as silver, a silver salt, a silver complex salt and a silver chelate. Further, the porous particle carrier is characterized in that at least a part of its surface is coated with a coating material.

These active ingredients are made into wettable powders, emulsions, powders or liquids.

[0008]

[Function] The silver compound, which is an active ingredient, directly acts on the affected part on the surface of the plant, and has a bactericidal / viricidal effect on the affected part inside the plant by absorption / translocation from the root or the body surface. To work. In addition, since the active ingredient of the coated product is gradually released on the plant surface or the soil rhizosphere, it continuously works.

[0009]

The present invention will be described in detail below with reference to examples.
First, a method for producing an aqueous thiosulfato silver complex salt solution and a silver silica gel-based drug used in the present invention will be described. 100 parts by weight of a water-soluble silver salt such as silver acetate, 450 parts by weight of a mixture of sodium sulfite and sodium bisulfite, and 300 parts by weight of a water-soluble salt of sodium thiosulfate were added to water containing no chlorine, dissolved and stirred sufficiently. While mixing, an aqueous solution of silver thiosulfato complex salt was obtained.

The carrier of the bactericidal / viricidal material used in this example is B-type silica gel powder described in "JIS Z 0701 Silica gel desiccant for packaging". This B-type silica gel powder is a silica gel powder having a low moisture absorption rate at low humidity, a high moisture absorption rate at high humidity, and a high total moisture absorption amount at high humidity, and its average particle size is about 3 μm.

The silica gel powder was dried at 180 ° C. for 2 hours or more. The thiosulfato silver complex salt aqueous solution was mixed with 100 parts by weight of the silica gel so that the silver component was 2 parts by weight. Then, the water absorbed in the solvent and the carrier was promptly removed. Then, this was pulverized to a predetermined particle size to obtain silica gel carrying a bactericidal / viricidal material.

100 parts by weight of the silica gel was dispersed in a solution prepared by diluting 100 parts by weight of tetraethoxysilane as a reactive organosilicon compound in ethyl alcohol, and pure water was added to this to hydrolyze the tetraethoxysilane. Then, at least a part of the surface of the silica gel was coated and dried to obtain a silver silica gel-based drug.

The silver-silica gel-based bactericidal and virucidal agent was effective even when the active ingredient was silver thiosulfato complex salt, or silver, silver salt and silver chelate.

The bactericidal / viricidal material can be used in various formulations. A wettable powder, an emulsion, and a sol are prepared by blending the thiosulfato silver complex salt aqueous solution and the silver-silica gel-based bactericidal and virucidal agent shown in Example 1 as main agents with auxiliary agents such as surfactants, binders and stabilizers. It is used by formulating as a powder, liquid, etc. An example of the formulation method is shown below.

(1) Wettable powder Silver silica gel-based bactericidal / viricidal material of Example 1: 50
Parts, calcium alkylbenzene sulfonate: 3 parts, polyoxyethylene nonylphenyl ether: 5 parts and clay: 42 parts are uniformly mixed, pulverized and dispersed to obtain a wettable powder.

(2) Emulsion The silver silica gel-based bactericidal / viricidal material of Example 1: 50
Parts, 30 parts of methyl ethyl ketone and 20 parts of polyoxyethylene nonyl phenyl ether: 20 parts are mixed and dissolved to prepare an emulsion.

(3) Dust agent The above silver-silica gel sterilizing / viricidal material: 3 parts and clay: 97 parts are uniformly mixed, pulverized and dispersed to obtain a powder agent.

(4) Liquid Agent Aqueous thiosulfato silver complex salt solution of Example 1: 20 parts, calcium alkylbenzene sulfonate: 2 parts, polyoxyethylene nonylphenyl ether: 3 parts and water: 75
Mix and dissolve parts to make a solution.

Next, specific test examples of wettable powder, emulsion and powder are shown below. 1) Effect test for cucumber powdery mildew disease Example 3 was applied to a seedling in which five true leaves of a cucumber (cultivar: four leaves), which had been cultivated in soil in a glass chamber, were developed using a unglazed No. 3.5 pot.
20 ml of a 500-fold dilution of the wettable powder shown in 1 was sprayed per pot. 24 hours after spraying, Sphaerotheca fuliginea S, a powdery mildew fungus of cucumber
awada) in neutral phosphate buffer and the spores are 10 ⁵ per ml.
The spore suspension adjusted so as to become individual was spray-inoculated. The area ratio (%) of the lesion that develops 3rd day after inoculation is examined, and the control value in the case of no drug spray is calculated by the following formula, and the method shown in (Table 1) as the evaluation value of the bactericidal effect Converted in.

The state of occurrence of chemical damage was determined by visual judgment according to the criteria shown in (Table 2). The above results are shown in (Table 3). The number of repeated treatments was 5 samples, and the average was taken.

[0021]

[Equation 1]

[0022]

[Table 1]

[0023]

[Table 2]

[0024]

[Table 3]

2) Tomato mosaic disease effect test Shown in Example 3 on a seedling in which seven true leaves of tomato (cultivar: large Fukuju) cultivated in the glass chamber by soil cultivation were developed using a No. 3.5 pot. 20 ml of a 500-fold diluted solution of the emulsion was sprayed per pot.

An extract of Tabacco mosaic virus, which is a tomato mosaic pathogen, is obtained by adding neutral phosphate buffer to 1 to 3 g of leaves in which mosaic symptom is well expressed in advance and grinding and filtering. The inoculum prepared by adding a small amount of silica gel with an average particle size of 3 μm to 10 ml was soaked in absorbent cotton globules on the third true leaf 24 hours after emulsion dispersion, rubbed 2-3 times, and immediately rinsed with water to inoculate. And

Seven days after the inoculation, the degree of occurrence of disease symptoms on the inoculated leaves was examined in five stages shown in (Table 4) and compared with the case of no drug spraying.

The occurrence of chemical damage was carried out in the same manner as in Test Example 1 above. The above results are shown in (Table 5).
The number of repeated treatments was 5 samples, and the average was taken.

[0029]

[Table 4]

[0030]

[Table 5]

3) Eggplant Efficacy Test Against Aogale Disease Eggplant (cultivar: Senryo No. 2) cultivated in a glass room using unglazed No. 3.5 pots had five true leaves of the true leaves developed at the seedling stage.
0.5 g per pot of the dusting agent shown in Example 3 on the upper surface of the pot soil
Sprayed. Twenty-four hours after spraying, Pseudomonas solanacear, which is a fungus of the eggplant Aogale, is used.
um Smith 1914) was suspended in an amount of 10 ⁵ per 1 ml, and a neutral phosphate buffer solution was sprayed and inoculated in the vicinity of the root of 10 ml per pot.

Five days after the inoculation, the degree of expression of disease symptoms in the whole plant was examined in five stages shown in (Table 6) and compared with the case of no drug spraying.

The state of occurrence of chemical damage was determined by the same method as in Test Example 1 above. The above results are shown in (Table 7).
The number of repeated treatments was 5 samples, and the average was taken.

[0034]

[Table 6]

[0035]

[Table 7]

Regarding the liquid agent shown in Production Method Example 4,
Results equivalent to those of the above specific test examples were obtained.

Using zeolite instead of silica gel as the carrier, a silver zeolite-based bactericidal / viricidal material was obtained in the same manner as in Example 1, and the formulation shown in Example 1 was also possible using this. Also, regarding the effect, the same result as that of the above specific test example was obtained.

[0038]

INDUSTRIAL APPLICABILITY The agricultural and horticultural chemicals of the present invention act widely against bacteria, fungi and viruses that cause plant pathology.
Furthermore, since the effective main component is a silver compound, it is highly safe for the human body and the environment and is less likely to cause phytotoxicity on plants.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Hoshino, 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Atsushi Nishino, 1006, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (7)

[Claims] 1. An agricultural and horticultural agent, wherein the active ingredient is at least silver or one or more of silver compounds thereof. 2. The agricultural / horticultural chemical according to claim 1, wherein the silver compound is silver, a silver salt, a silver complex salt or a silver chelate. 3. The agricultural / horticultural chemical according to claim 2, wherein the silver complex salt is a thiosulfato silver complex salt. 4. The agricultural / horticultural chemical according to claim 1, wherein at least one of the active ingredients is supported on a porous particle carrier. 5. The agricultural / horticultural chemical according to claim 4, wherein at least a part of the surface of the porous particle carrier carrying the active ingredient is coated with a coating material. 6. The porous particle carrier is silica gel particles,
The agricultural / horticultural chemical according to claim 5, wherein the coating material is a reactive organosilicon compound, and the silica gel particles and the organosilicon compound are chemically bonded. 7. The agricultural / horticultural chemical according to claim 1, wherein the active ingredient is used as a wettable powder, a powder, an emulsion or a liquid.