JP2002080312A - Seed disinfection formulation for high concentration dilution - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seed disinfection formulation which is useful for high concentration dilution, has good adhesivity to the seeds, does not dust the water- dispersible powder, when prepared into a high concentration formulation, and does not have a problem on workability and safety. SOLUTION: This seed disinfection formulation for high concentration dilution is obtained by wrapping with a water-soluble film a seed disinfection water- dispersible powder which contains a seed disinfector containing pefurazoate and is useful for the high concentration dilution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high-concentration diluent containing penta-4-enyl = N-furfuryl-N-imidazol-1-ylcarbonyl-DL-homoalaninate (hereinafter referred to as "pefurazoate"). The present invention relates to a technique for improving a wettable powder for disinfecting seeds.

[0002]

2. Description of the Related Art As a seed disinfectant, a powdered wettable powder comprising an agrochemical active ingredient, a surfactant and an extender such as clay is widely used. For use, this wettable powder is mixed with water.
Generally, a method of diluting the seed rice in a dilution of 0 to 200 times and then diluting the diluted liquid is generally performed. Recently, as a method for disinfecting a large amount of seeds in a labor-saving manner, a wettable powder is diluted 3 to 20 times with water, that is, a so-called high-concentration diluent is used. A method of spraying a high-concentration diluent on seeds using a spray device for disinfecting seeds has become widespread. This high-concentration diluent spray treatment method for the seed rice, because the chemical solution treatment amount for the seed rice is small,
It is required to have sufficient drug adhesion to sufficiently exert the seed disinfection effect. However, the conventional high-concentration dilution seed disinfectant does not always provide a sufficient amount of adherence, and a situation occurs in which the seed disinfection effect is not sufficient.

[0003] The present invention is characterized in that the preparation is packaged in a water-soluble film and used. However, a wettable powder is packaged in a water-soluble film and diluted 400 to 3000 times with water when used. A method of spraying on foliage, pests and the like is known. In addition, for example, a pesticide that may contain a foaming agent or a buoyancy enhancer in a form in which a solid pesticide formulation that easily decomposes or dissolves in water or on the water surface is wrapped in a sheet that breaks or dissolves in water. JP-A-4-226901 discloses a composition, an agrochemical composition in the form of a tablet containing a foaming agent, an agrochemical composition in the form of a tablet containing a buoyancy enhancer, and a method of treating an agrochemical by throwing the agrochemical composition into a paddy field. The described technique is known.

Further, Japanese Patent Application Laid-Open No. HEI-5-1993 discloses a method for easily treating a chemical by throwing a water-developable agricultural chemical preparation package packaged with a water-soluble film into a water system such as a paddy field.
A technique described in Japanese Patent No. 78207 is known. further,
Contains one or more pesticidal active ingredients that are pest control active ingredients or food growth regulating active ingredients, and has an apparent density of 1 g /
A composition obtained by adding a weight to a wettable powder and / or a granular wettable powder having a particle size of less than ³ cm ³ is contained in a water-soluble film, and the apparent density of the composition in the water-soluble film is 1 g / The technology described in Japanese Patent Application Laid-Open No. 5-310502 is known as a packaged pesticide having a size of at least ³ cm ³ . Furthermore, a pesticide wettable powder or a granular wettable powder comprising a water-soluble pesticide or a granular wettable powder packaged with a water-soluble base material, wherein the water-soluble base material allows gas to pass therethrough, Japanese Patent Application Laid-Open No. Hei 8-245307 discloses a packaged pesticide formulation having a hole having a size that cannot pass through, which is characterized by having a short soaking time of the drug when diluted with water.

However, in both cases, a technique for diluting a packaging bag made of a water-soluble film with water 200 to 2000 times and spraying a diluent having a normal concentration and using the diluting solution, or using a packaging bag itself on a rice pad This is a technique for injecting into water, in which a preparation used after being diluted at a high concentration of 3 to 20 times with water is packaged in a water-soluble film, and the water-soluble film packaging bag is used as a high-concentration seed disinfectant. There are no reports or studies on the properties or the adhesion of chemicals to seeds, and it is still not enough even with conventional technical knowledge.

[0006]

The conventional high-concentration seed disinfectants for diluting do not have sufficient adhesion of the agents to the seeds. Therefore, development of a seed disinfectant free of these problems is desired. In addition, since a large amount of powdered wettable powder is used when preparing high-concentration chemicals for seed disinfection, dusting is remarkable during work, workability is poor, and safety such as exposure of chemicals to workers. Have problems, and improvements are required. In such a situation, an object of the present invention is to provide a drug with good adhesion to seeds, and at the time of preparation of a high-concentration drug, there is no powder of wettable powder, and there is no problem in workability and safety. An object of the present invention is to provide a seed disinfectant for high concentration dilution.

[0007]

Means for Solving the Problems The present inventors diligently studied to solve these problems. As a result, the formulation containing a seed disinfectant containing perfurazoate consisting of the following chemical structural formula, and a seed disinfectant wettable powder for high-concentration dilution packed in a water-soluble film has high adhesion to seed rice for high-concentration dilution. Was found to be useful as a seed disinfectant.

[0008]

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The wettable powder for seed disinfection packaged with the water-soluble film may be put into water as it is, and then mixed by ordinary stirring. At this time, the medicine is packaged in a water-soluble film, so there is no dusting and workability,
Excellent safety. In particular, the efficiency of adhering the drug to the seed rice is greatly improved, and seed disinfection can be performed without any problems such as a decrease in seed disinfection effect.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a seed disinfectant for high concentration dilution according to the present invention will be described below. First,
A package made of a water-soluble film for packaging the seed disinfectant of the present invention will be specifically described.

The water-soluble film used in the present invention is:
Any film that can be dissolved in water and has a certain strength as a packaging bag can be used.The material of the film can be selected from those that are compatible with the seed disinfectant chemicals in terms of chemical and physical stability. I just need. As the water-soluble film, a film composed of a natural water-soluble polymer, a synthetic water-soluble polymer, and a semi-synthetic water-soluble polymer is effectively used. Examples thereof include, but are not limited to, the following, and one or two or more of these may be used in combination. Examples of natural water-soluble polymers: starch, sodium alginate, xanthan gum, pullulan and the like. Examples of synthetic water-soluble polymers: polyvinyl alcohol, sodium polyacrylate, polyethylene oxide, polyvinylpyrrolidone, and the like. Examples of semi-synthetic water-soluble polymers such as hydroxyethyl cellulose and carboxymethyl cellulose.

The thickness of the water-soluble film may be selected from the relationship between the amount of contents and the strength of the film.
One having a thickness of 0 μm is used. When the water-soluble film is thin, the amount of the water-soluble film in the water diluent decreases, and the amount of the drug attached to the seed decreases. When the water-soluble film is thick, the amount of the water-soluble film in the water diluent increases,
It is expected that a good amount of adhesion to the seed is obtained,
Actually, the chemicals coagulate in the water diluent, and the spraying process cannot be performed. When the dilution ratio is high, the amount of the water-soluble film in the water diluent decreases, and the amount of the drug adhered to the seed decreases. When the dilution ratio is low, the amount of the water-soluble film in the water diluent increases, and it is expected that a good adhesion amount to the seed is obtained. Agglomeration occurs and spraying cannot be performed.

Therefore, the amount of the water-soluble film used is from 0.006 parts by weight to 1 part by weight of the seed disinfectant for the contents.
It is important to use in a range equivalent to 0.06 parts by weight. Within this range, powdering of the drug is prevented and good adhesion of the drug to the seeds is obtained. When the amount of the water-soluble film is less than 0.006 parts by weight, the amount of the drug adhered to the seeds is reduced. When the amount is more than 0.06 parts by weight, the agent is coagulated in a diluted chemical solution with water, and the spraying process is performed. become unable.

Next, the seed disinfecting agent used in the present invention may be any wettable powder for seed disinfecting which is usually used for disinfecting seeds by using a spraying device for seeds. Examples of the components include the following. Seed disinfecting ingredient benomyl, thiabendazole, thiophanate methyl,
Thiuram, prochloraztrifumisol, ipconazole, basic copper chloride, cupric hydroxide and the like. Fenitrothion, an insecticidal ingredient for seed disinfection . The names of these pesticidal active ingredients are compounds described in the “Agrochemical Handbook” (December 15, 1998, published by the Japan Plant Protection Association).

The method for preparing the package of the seed disinfectant for high concentration dilution packaged with the water-soluble film of the present invention is not particularly limited, but can be prepared by the following method. For example, a wettable powder for seed disinfection for high concentration dilution, which is used after being diluted 3 to 20 times with water, is prepared from the aforementioned pesticide active ingredients for disinfecting seeds, surfactants, extenders, and the like. The weight of 6 g to 6 g per 1 kg of the wettable powder thus obtained is obtained.
By packaging with a water-soluble film equivalent to 0 g, the seed disinfectant preparation for high concentration dilution of the present invention can be obtained.

The surfactant used for preparing the wettable powder for high concentration dilution of the present invention includes a nonionic surfactant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant. Activators and the like. Examples of nonionic surfactants include polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene alkyl ester, polyoxyethylene sorbitan alkylate, polyoxyethylene phenyl ether polymer, Examples thereof include polyoxyethylene alkylene aryl phenyl ether, polyoxyethylene alkylene glycol, polyoxyethylene, and polyoxypropylene block polymer.

Examples of anionic surfactants include lignin sulfonate, alkyl aryl sulfonate, dialkyl sulfosuccinate, polyoxyethylene alkyl aryl ether sulfate, alkyl naphthalene sulfonate, polyoxyethylene styryl phenyl ether sulfate. , Lauryl sulfate and the like. Examples of the cationic surfactant include an alkylamine salt. As the amphoteric surfactant,
Amidobetaine type, imidazaline type and the like can be mentioned. The surfactants that can be used in the present invention are not limited to those exemplified above.

An extender is used to prepare the seed disinfectant preparation of the present invention as a wettable powder. Examples include clay, talc, bentonite, calcium carbonate, white carbon, sucrose, lactose, diatomaceous earth, ammonium sulfate, sodium sulfate, and the like. These can be used alone or in combination of two or more. In addition, as other auxiliary agents, a formulation can also be prepared by adding a stabilizing agent for the seed disinfecting active ingredient over time, an antifoaming agent, and the like, if necessary.

[0019]

Next, the present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto. All parts mean parts by weight. The part in parentheses indicates the ratio of the water-soluble film to 1 part of the high concentration diluted seed disinfectant.

Example 1 20 parts of perfurazoate, 20 parts of thiuram, 10 parts of polyoxyethylene styryl phenyl ether, 5 parts of sodium salt of β-naphthalenesulfonic acid formalin condensate, 20 parts of white carbon, 15 parts of lactose, and 10 parts of clay Was ground and mixed with a hammer mill (manufactured by Fuji Paudal Co., Ltd.) to prepare a wettable powder. 133.3 g of this wettable powder were added to a thickness of 4
0 [mu] m, 1.6 g (0.012 parts) by weight of water-soluble polyvinyl alcohol-equivalent film is wrapped in an envelope,
A high-concentration seed disinfecting wettable powder for dilution was obtained.

Example 2 20 parts of perfurazoate, 5 parts of polyoxyethylene styryl phenyl ether, 5 parts of sodium ligninsulfonate
Parts, 20 parts of white carbon and 50 parts of sucrose were pulverized and mixed with a hammer mill to prepare a wettable powder.
3g is 20μm thick and weighs 0.8g (0.006 parts)
A considerable amount of a water-soluble polyvinyl alcohol film was packaged in an envelope to obtain a seed disinfectant wettable powder for high concentration dilution of the present invention.

Example 3 20 parts of perfurazoate, 20 parts of thiuram, 10 parts of polyoxyethylene styrylphenyl ether, 5 parts of sodium salt of β-naphthanesulfonic acid formalin condensate,
20 parts of white carbon, 15 parts of lactose and 10 parts of clay were mixed and pulverized with a hammer mill to prepare a wettable powder. 133.3 g of this wettable powder is 20 μm thick and weighs 2.6 g (0.
(0195 parts) A considerable amount of a water-soluble polyvinyl alcohol film was packaged in an envelope to obtain a high-concentration seed disinfectant wettable powder for dilution of the present invention.

Example 4 The thickness of the water-soluble polyvinyl alcohol film of Example 3 was changed from 20 μm to 40 μm and the film weight per 133.3 g of the preparation was changed from 2.6 g (0.0195 parts) to 7.
8 g (0.0585 parts), except that the same high-concentration dilution seed disinfectant wettable powder as in Example 3 was obtained.

Example 5 The water-soluble polyvinyl alcohol film of Example 1 (thickness: 40 μm, film weight: 1.6 g (0.012 parts) per 133.3 g of the preparation) was treated with pullulan (thickness: 20 μm,
0.8 g of film weight per 133.3 g of formulation (0.
006 parts), except that the same high-concentration seed disinfecting preparation for dilution as in Example 1 was obtained.

Example 6 The water-soluble polyvinyl alcohol film of Example 2 (thickness: 20 μm, film weight: 0.8 g (0.0060 parts) per 133.3 g of the preparation) was subjected to pullulan (thickness: 30 μm).
m, film weight 1.0 g per 133.3 g of preparation
(0.0075 parts), except that the same high-concentration seed disinfecting preparation for dilution as in Example 2 was obtained.

Comparative Example 1 A wettable powder similar to that of Example 1 but not packaged with a water-soluble film was obtained. Comparative Example 2 A wettable powder similar to that of Example 2 but not packaged with a water-soluble film was obtained. Comparative Example 3 A wettable powder similar to that of Example 3 but not packaged with a water-soluble film was obtained.

Comparative Example 4 The water-soluble polyvinyl alcohol film of Example 1 (thickness: 40 μm, film weight: 1.6 g (0.012 parts) per 133.3 g of the preparation) was prepared by adding a 20 μm-thick preparation:
The film weight per 3.3 g is 0.6 g (0.004 g).
5 parts), except that the same high-concentration seed disinfecting preparation for dilution as in Example 1 was obtained.

Comparative Example 5 The water-soluble polyvinyl alcohol film of Example 3 (thickness: 20 μm, film weight: 2.6 g (13,195 g) per 133.3 g of the preparation, 0.0195 parts) was prepared by mixing the film with a thickness of 60 μm, the preparation 1
The film weight per 33.3 g is 8.5 g (0.06
38 parts), except that the same high-concentration seed disinfecting preparation for dilution as in Example 3 was obtained.

Here, the adhesiveness, dispersibility, and control effect of the seed disinfectant preparation for high concentration dilution according to the present invention are shown by Test Examples 1 to 3 below to further clarify the usefulness of the present invention.

Test Example 1 (Test on Amount of Attached to Seed Paddy) Dried rice seed (150 g) naturally infected with rice birch seedling disease (variety: "Nihonbare") was prepared according to Example 1 for high-concentration dilution. A chemical solution obtained by diluting a wettable powder for seed disinfection with water to a predetermined concentration or a seed disinfectant not packaged with a water-soluble film was diluted with water. 4.5 ml of drug solution
(Equivalent to 3% of the weight of dried seed rice) was sprayed using an air spray gun (F88, manufactured by Meiji Kikai Seisakusho) so as to uniformly adhere to the seed rice. An agrochemical active ingredient is extracted from a part (10 g) of the seed rice after the chemical solution treatment and subjected to HPLC.
(High performance liquid chromatograph) was used to calculate the amount of the drug attached to the seed rice.

Test Example 2 (Dispersibility test in water) A beaker with a capacity of 1000 ml (diameter 10.5 cm, height 1)
866 ml of 3 ° hard water at 20 ° C. was added to 4.5 cm), and 133.3 g (dilution ratio: 7.5 times) of a seed disinfectant packaged with a water-soluble film was added.
and a magnetic stirrer (a stirrer length of 6 cm,
300-400 r. p. After stirring and dispersing for 5 minutes in m), stirring was stopped and the presence or absence of aggregation of the dispersion was visually evaluated. Evaluation criteria A: No aggregation B: Some aggregation C: Aggregation

Test Example 3 (Test for controlling rice blight seedling disease) The seeds disinfected in Test Example 1 were soaked at 15 ° C. for 6 days.
Germination was continued at 30 ° C. overnight. 1 in 150 g of this seed rice
The amount of 8 g is transferred to a normal nursery box (length × width × height = 60 cm × 3).
The seedlings were sown in a nursery box (length × width × height = 12 cm × 15 cm × 3 cm) having a size of 1/10 of 0 cm × 3 cm, and immediately covered with soil. After covering the soil, germination treatment was performed at 32 ° C. for 2 days. After germination, shading was performed for 2 days in a greenhouse, followed by removal of the cooling gauze and normal cultivation management.

The seedling cultivation used was commercially available Kumiai granular cultivation D (manufactured by Kureha Chemical Industry Co., Ltd.). Sowing 30
After a day, all the seedlings in the nursery box were examined for the number of diseased seedlings showing diseased rice seedlings, such as prostrate and withering, and the number of disease-free seedlings, and the diseased seedling rate (%) was calculated by the following formula to determine the control value (%). Was. Regarding the phytotoxicity, the degree of budding, growth, etc. were observed and indicated by the following phytotoxicity. Diseased seedling rate (%) = (number of diseased seedlings) / (total number of seedlings surveyed) x 10
0 Control value (%) = {1− (Affected seedling rate in treated area) / (Affected seedling rate in untreated area)} × 100

Degree of chemical damage-: None ±: Slight +: Small ++: Medium +++: Large

Table 1 shows the results of Test Examples 1 to 3. As understood from the results of Test Examples 1 to 3, according to the present invention,
It is excellent in the amount of adhesion to seed rice, has good dispersibility in water, and can be expected to have excellent seed disinfection activity.

[0036]

[Table 1]

[0037]

The use of the wet disinfectant for disinfecting seeds of high concentration according to the present invention has the following effects. That is, first, when the rice is diluted 3 to 20 times with water and sprayed on rice seed, the amount of the drug solution attached increases, the seed disinfecting effect is excellent, and a stable effect is exhibited. . Second
In addition, since the powdered wettable powder is packaged in a water-soluble polymer film, it is easy to handle because there is no dusting in the operation of preparing the diluent by putting it in water. As a result, there is no adverse effect such as powder being applied to a person.

Continuation of front page (72) Inventor Shinji Yonemura 1-8-11-205 Okada, Atsugi-shi, Kanagawa F-term (reference) 2B022 EA10 4H011 AA01 BA01 BA06 BB09 BB13 BC07 BC10 BC18 BC19 BC20 DA15 DA22 DC03 DC05 DD03 DH02 DH03 DH10

Claims (2)

[Claims] 1. Penta-4-enyl = N-furfuryl-
Adhesiveness to seed rice, characterized by being packed with a water-soluble polymer film, containing a disinfectant wettable powder for high concentration dilution containing N-imidazol-1-ylcarbonyl-DL-homoalaninate. Improved seed disinfection wettable powder for high concentration dilution. 2. The amount of the water-soluble film used is 0.0 to 1 part by weight of the wettable powder for seed disinfection for high concentration dilution to be packaged.
The wettable powder for disinfecting seeds for high concentration dilution according to claim 1, wherein the amount is from 06 parts by weight to 0.06 parts by weight.