TWI583308B - Method for controlling rice disease - Google Patents

Description

Rice disease prevention and treatment method

The present invention relates to a method for controlling diseases of rice. Specifically, it relates to a method for controlling rice diseases by directly applying an active ingredient to rice seeds.

In rice farming, rice diseases and the countermeasures are important issues both in ancient and modern times. Therefore, to date, research has shown various effective ingredients for controlling the effects of rice diseases, and developed and commercialized many rice disease control agents.

Such a rice disease control agent adopts various application forms depending on the nature of the design as a pesticide preparation. In other words, the water can be applied directly to the surface of the stems and leaves of the stems and leaves, the surface of the water surface of the rice field, and the seedling box of the seedling box cultivated directly before transplanting the field, and transplanted in the field, and then applied. The side strips of the side strips of the transplanted seedlings are applied, and the seed treatment of the medicaments directly applied to the rice seeds before germination is further applied.

The difference in the above-mentioned respective application forms is that the quality of the work required for the application of the pesticide is different. In particular, in recent years, the reduction of the agricultural population and the aging of the average age in Japan have become remarkable. It is imperative to reduce the labor burden in agricultural operations. Therefore, it is indispensable to introduce efficient techniques and effective techniques for controlling pests and weeds. . Therefore, even in the aforementioned application form, seed treatment is one of the easiest methods.

Nowadays, when rice is planted in rice seeds, it is usually necessary to take pre-steps to promote the germination of rice seeds. In other words, the rice seeds are immersed in cold water at about 15 ° C, and the water is changed for 6 days. The soaking step of absorbing water by the rice seeds, and then immersing the rice seeds in warm water at about 30 ° C for 24 hours to expose the germination step to heat. Seed treatment is the administration of the agent before or during these steps.

When the seed treatment type is further subdivided, the seed immersion of the chemical liquid which is used in the first step of the water used in the above-mentioned pre-measurement step, the rice seed before the pre-treatment step, and the seed powder of the powdered medicine are scattered. The clothes are treated similarly to the seed of the rice before the pre-treating step, by dropping or spraying the seed of the agent dissolved in water, seed immersion, and the like.

It is necessary to add a predetermined amount of the drug to the seed immersion step in the soaking step or the germination step, and it is necessary to stir the mixture into a uniform liquid, but the remaining work contents are not changed from the usual pre-measurement steps. On the other hand, in the powder coating treatment, the smear treatment, and the spray treatment, rice seeds and a predetermined amount of the drug are added to a commercially available seed treatment device, and the discharged rice seeds are supplied to the pre-measurement step. Either method is also very simple compared to other methods of dispersing the drug in the vast paddy field. Therefore, it is expected that several methods such as the method described in Patent Document 1 can be disclosed by using a rice disease control agent capable of seed treatment to reduce the labor burden in rice production.

However, the seed treatment is a method in which the seeds of the most immature and delicate state of the rice are directly exposed to the high-concentration agent, so that there is a problem that phytotoxicity easily occurs. Therefore, there are theoretically several agents that can be used for seed treatment, but now, in seed treatment, as a high safety for rice, it can be practically applied to seed treatment, and the pesticide registered with the pesticide is only a little.

In addition, the application form of the seed treatment has the characteristics of being longer than other control methods during the period from the treatment of the drug to the time when the rice disease occurs. . Therefore, for the rice diseases occurring in the later stage (for example, the late growth stage of rice), the efficacy of the active ingredient of the seed treatment cannot be sustained, and there is a problem that the control effect cannot be fully exerted. Therefore, the rice disease control system by seed treatment is now carried out for the purpose of specifically controlling rice diseases at the seedling stage. For the rice disease that occurs later, it is necessary to spread the pharmacy in the agricultural field of the paddy field before and after the occurrence period of the target rice disease, and it is still insufficient to reduce the labor burden by seed treatment.

In addition, the powder coating treatment and the smear treatment are also subject to the physical utilization rate of the active ingredient. By this treatment, even if the active ingredient is attached to the surface of the rice seed, in the subsequent pre-measurement step or the like, since the rice seed is taken out after being immersed in water several times, a large part of the active ingredient is washed away in a series of operations. Even in the immersion treatment, except during the final stage of the pre-measurement step, this is still the case. Therefore, in order to achieve sufficient control effect, in addition to the effective amount of the active ingredient, it is necessary to estimate the excess active ingredient amount of the aforementioned lost portion. This means that seed treatment (especially powder coating treatment or smearing treatment) is a method of dispersing the medicine in the paddy field, and requires more medicine. Even if it can help the agricultural work to save labor, it can be praised, but it cannot be denied that it is a disadvantageous economic effect. By.

On the other hand, as one of the active ingredients of the rice disease control agent, 3-(3,4-dichloroisothiazol-5-ylmethoxy)-1,2-benzothiazole-1,1-di is known. Oxide (hereinafter sometimes referred to as Compound 1) (Patent Document 2). However, the effectiveness, application amount, phytotoxicity (safety), and the like when the compound 1 is applied to rice seeds are not specifically examined, and the utility of the compound 1 as a seed treatment agent is completely unknown.

Prior technical literature Patent literature

[Patent Document 1] JP-A-2001-342105

[Patent Document 2] International Publication No. 2007/129454

In view of the above-mentioned problems, the present invention has an object of providing a rice disease prevention and treatment method which is high in safety, simple and efficient, and has a labor burden and which has a sufficient effect.

In order to achieve the above object, the inventors of the present invention have tried to review the results of various efforts to find that the compound 1 is directly applied to the rice seed before germination, so that the rice does not cause phytotoxicity, and the germination from the rice seed to the harvest is long. During this period, the disease control effect can be sustained, and in particular, the amount of the drug which is less than the method of dispersing the drug in the paddy field by the powder coating treatment or the smear treatment can exert an excellent disease control effect, and the present invention can be completed.

That is, the embodiment of the present invention is as described later.

(1) Using 3-(3,4-dichloroisothiazol-5-ylmethoxy)-1,2-benzothiazole-1,1-dioxide as a compound as the compound shown in the following 1 The pesticide composition (pesticide preparation) is subjected to at least one selected from the group consisting of immersion treatment, powder coating treatment, smearing treatment, and spray treatment on the rice seeds before sowing. A method for controlling diseases of rice characterized by treatment.

(2) The rice seed before planting is subjected to a coating treatment or a smear treatment as the method described in the feature (1).

(3) 3-(3,4-dichloroisothiazol-5-ylmethoxy)-1,2-benzothiazole-1,1- is used in a ratio of 0.3 to 0.7 g per 150 g of rice seeds. The dioxide is treated as the method described in the feature (2).

(4) The method according to any one of (1) to (3), which is for controlling rice rice fever.

(5) The method according to any one of (1) to (4), wherein the disease control treatment is not carried out in the late stage of growth and development of the rice (for example, between 15 days before the earing and 25 days after the earing).

According to the present invention, it is possible to effectively control rice diseases without accompanying the phytotoxicity of rice and with a small labor burden. In particular, the rice-to-rice fever has an effect, and it can also control the rice-derived fever of the drug-resistant bacteria that is still the problem. In addition, the disease control effect is due to the self-cultivation period until the harvest period, so in the late growth stage of the rice, no additional disease control operations are required. Further, in the embodiment in which the powder coating treatment or the smear treatment in the present invention is carried out, it is possible to control the disease of rice more than the conventional control method, and it is more effective in terms of safety and economy.

The best form for implementing the invention

The present invention uses 3-(3,4-dichloro) of the compound shown in the following formula 1. Thiazol-5-ylmethoxy)-1,2-benzothiazole-1,1-dioxide is used as an active ingredient. The method for producing this compound (hereinafter referred to as Compound 1) is disclosed in the aforementioned Patent Document 2, and there is no particular obstacle at the time of acquisition.

In the present invention, the pesticide composition (agrochemical preparation) using the compound 1 as an active ingredient is subjected to at least one treatment selected from the group consisting of immersion treatment, powder coating treatment, smearing treatment, and spray treatment on the rice seeds before sowing. An example of the immersion treatment is to use a method in which a chemical is added to a portion of the water used in the pre-treatment step. Further, the powder coating treatment is a method of dispersing a powdery medicament for the rice seed before the pre-treating step, and for example, a smear treatment or a spray treatment is a method of dropping or spraying a medicament dissolved in water to the rice seed before the pre-treatment step.

As the dosage form, the compound 1 itself can be used, and as needed, the additive component generally used in the compound 1 can be blended as a pesticide adjuvant, and the preparation is used as an emulsion, a powder, a hydrating agent, a granular hydrating agent, and water. The composition of the suspension and the like is used. The latter case can be selected according to the actual treatment type, and the appropriate dosage form can be selected. For example, when seed coating is applied, powder of powder or the like is required because the powder of the compound must be attached to the seed. Formulation compositions are suitable. On the other hand, since the seed immersion, the seed application, and the seed spray are used to dilute the drug to a predetermined concentration with water, it is easy to use a liquid preparation composition such as an emulsion or an aqueous suspension, or is designed to be sufficiently dispersed and suspended as a medicament. A solid preparation composition such as a hydrating agent or a granular hydrating agent in water. However, the combination of the form or the treatment method is not limited to the foregoing.

Examples of the agricultural chemical adjuvant include a carrier such as a solid carrier or a liquid carrier, a surfactant, a binder, an adhesion-imparting agent, a tackifier, a coloring agent, an extender, a spreading agent, an antifreezing agent, and an anti-caking agent. , a breaker, a decomposing agent, and the like. Others may also use preservatives or plant flakes as additives as needed. These additional components may be used singly or in combination of two or more.

Examples of the solid carrier include natural minerals such as quartz, clay, kaolin, pyrophyllite, sericite, talc, bentonite, acid white clay, green vermiculite, zeolite, and diatomaceous earth; calcium carbonate and ammonium sulfate; Inorganic salts such as sodium sulfate and potassium chloride; organic solid carriers for synthesizing tannic acid, synthetic citrate, starch, cellulose, plant powder, etc.; plastic carriers such as polyethylene, polypropylene, polyvinylidene chloride, etc. .

Examples of the liquid carrier include monohydric alcohols such as methanol, ethanol, propanol, isopropanol, and butanol; ethylene glycol, diethylene glycol, propylene glycol, hexanediol, polyethylene glycol, polypropylene glycol, and glycerin. And other oleyl alcohols; polyol compounds such as propylene glycol ether; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, cyclohexanone; diethyl ether; An ether of ketone, ethylene glycol monoethyl ether, dipropyl ether, tetrahydrofuran, etc.; n-alkane (normal Paraffin), an aliphatic hydrocarbon such as a cycloalkane, an isoparaffin, a kerosene or a mineral oil; an aromatic hydrocarbon such as benzene, toluene, xylene, mineral spirits or alkylnaphthalene; dichloroethane, chloroform, tetra Halogenated hydrocarbons such as carbon chloride; esters of ethyl acetate, diisopropyl phthalate, dibutyl phthalate, dioctyl phthalate, dimethyl adipate; a lactone such as butyrolactone; a guanamine such as dimethylformamide, diethylformamide, dimethylacetamide or N-alkylpyrrolidone; a nitrile such as acetonitrile; a vegetable oil such as a sulfide such as dimethyl sulfoxide, soybean oil, rapeseed oil, cottonseed oil or castor oil; water, and the like.

Examples of the surfactant include sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, sucrose fatty acid ester, polyoxyethylene fatty acid ester, polyoxyethylene resin acid ester, and polyoxyethylene fatty acid. Diester, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene dialkyl phenyl ether, polyoxyethylene alkyl phenyl ether formaldehyde condensate, polyoxyethylene polyoxypropylene block polymerization , alkyl polyoxyethylene polyoxypropylene block polymer ether, polyoxyethylene fatty acid decylamine, polyoxyethylene fatty acid bisphenol ether, polyalkylene phenyl phenyl ether, polyoxyalkylene styryl Nonionic surfactants such as phenyl ether, acetylene glycol, polyoxyethylene ethyl acetylene glycol, polyoxyethylene castor oil, polyoxyethylene hardened castor oil, etc.; alkyl sulfate, polyoxyethylene alkyl Ether sulfate, polyoxyethylene alkyl phenyl ether sulfate, polyoxyethylene styryl phenyl ether sulfate, alkyl benzene sulfonate, lignosulfonate, alkyl sulfosuccinate, naphthalene sulfonic acid Salt, alkylnaphthalenesulfonate, salt of naphthalenesulfonic acid formaldehyde condensate, alkylnaphthalenesulfonic acid Salts of condensates, salts of fatty acids, polycarboxylates, N- methyl fatty amine acid salts muscle, resinates, polyoxyethylene alkyl ether Anionic surfactants such as phosphates, polyoxyethylene alkylphenyl ether phosphates, etc.; laurylamine hydrochloride, stearylamine hydrochloride, oleylamine hydrochloride, stearylamine acetate, hard a cationic surfactant such as lipoamine propylamine acetate, alkyl trimethyl ammonium chloride, alkyl dimethyl alginate, polyoxyethylene alkylamine salt; alkylamine fatty acid salt, alkyl betaine An amphoteric surfactant such as an alkylamine oxide; a polyoxyalkylene surfactant such as a polyether modified polydimethyl siloxane or a polymethyl alkyl siloxane; a perfluoroalkyl sulfonic acid; A fluorine-based surfactant such as perfluoroalkylcarboxylic acid or perfluorooctylethanol.

The binding agent or the adhesion-imparting agent may, for example, be carboxymethylcellulose or a salt thereof, dextrin, water-soluble starch, xanthan gum, guar gum, sucrose, polyvinylpyrrolidone, gum arabic, polyvinyl alcohol, poly Ethylene acetate, sodium polyacrylate, polyethylene glycol having an average molecular weight of 6000 to 20,000, polyethylene oxide having an average molecular weight of 100,000 to 5,000,000, cephalin, lecithin and the like.

Examples of the tackifier include xanthan gum, guar gum, Welan Gum, carboxymethylcellulose, polyvinylpyrrolidone, carboxyvinyl polymer, acrylic polymer, starch compound, and water-soluble. Water-soluble polymers of polysaccharides; such as high-purity bentonite, inorganic fine powder of fumed cerium oxide, and the like.

Examples of the colorant include inorganic pigments of iron oxide, titanium oxide, and Prussian blue; organic dyes such as alizarin dyes, azo dyes, and metal phthalocyanine dyes.

The extender may, for example, be a polyoxyalkylene surfactant, a cellulose powder, a dextrin, a processed starch, a polyaminocarboxylic acid chelate, a crosslinked polyvinylpyrrolidone, a copolymer of maleic acid and styrene. (meth) propylene An acid-based copolymer, a polymer obtained from a polyhydric alcohol, a half ester of a dicarboxylic acid anhydride, a water-soluble salt of polystyrenesulfonic acid, or the like.

Examples of the spreading agent include paraffin wax, decene, polyamine resin, polyacrylate, polyoxyethylene, wax, polyvinyl alkyl ether, alkylphenol formaldehyde condensate, and synthetic resin emulsion.

Examples of the antifreezing agent include polyhydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol, and glycerin; urea and the like.

Examples of the anti-caking agent include polysaccharides such as starch, alginic acid, mannose, and galactose, polyvinylpyrrolidone, fumed ceria, a gum, and a petroleum resin.

Examples of the breaker include sodium tripolyphosphate, sodium hexametaphosphate, metal stearate, cellulose powder, dextrin, methacrylate copolymer, polyvinylpyrrolidone, and polyaminocarboxylic acid chelate. , sulfonated styrene. Isopropylene. Maleic anhydride copolymer, starch. Polyacrylonitrile graft copolymer and the like.

Examples of the decomposing agent include desiccants such as zeolite, quicklime, and magnesia; ultraviolet absorbers such as salicylic acid and benzophenone; sulfuric acid, acetic acid, sodium acetate, phosphoric acid, ammonium hydrogen phosphate, and phosphoric acid. A pH adjuster such as potassium hydrogen, sodium phosphate, boric acid, sodium borate, sodium hydrogencarbonate, sodium carbonate, sodium hydroxide or the like.

Examples of the preservative include potassium sorbate and 1,2-benzothiazolin-3-one.

Examples of the plant sheet include sawdust, coconut shell, maize cob, tobacco stem, and the like.

Further, such a drug can be produced by a usual method, and for example, the method described later can be used. Method of making.

(1) A method for producing an emulsion of a liquid carrier in which an organic solvent, an organic solvent or the like is dissolved in a compound 1, a surfactant, and other pesticide adjuvants required for the reaction.

(2) A method for producing a powder obtained by mixing a compound 1, a solid carrier, and other pesticide adjuvants required for the reaction with a suitable pulverizer.

(3) A method for producing a hydrating agent in which a compound 1, a surfactant, a solid carrier, and other pesticide adjuvants required for the reaction are mixed and pulverized by a suitable pulverizer.

(4) A mixture of compound 1, surfactant and other pesticide adjuvants required for the reaction (which may be partially or completely pulverized in advance), added with an appropriate amount of water, and after mixing, self-opening into a regulation A method of producing a granular hydrating agent by extrusion granulation of a sieve having a pore size.

(5) A method for producing an aqueous suspension in which a compound 1, a surfactant, and other pesticide adjuvants required for the reaction are dispersed in a liquid carrier such as water, and mixed and pulverized by a suitable pulverizer.

The content ratio of the compound 1 in the drug is usually from 30 to 95% on a mass basis, and is preferably in the range of from 50 to 90%, based on the total amount. The content ratio of each of the pesticide adjuvants varies depending on the content ratio of the above-mentioned compound 1 or the selected dosage form, but is usually selected from 5 to 70%, preferably in the range of 10 to 50%. In particular, in the case of a preparation composition for seed coating, seed application or seed spray, a compound 1 is contained in a case where the surface area of the drug attached to the rice seed is limited (for example, 50% or more, preferably 80% or more) The preparation is suitable.

The application amount of the compound 1 in the present invention is, for example, about 0.1 to 1.3 g per dry weight of the rice seed of 150 g, but the range is preferably 0.1 to 1 g, more preferably 0.3 to 0.7 g. In particular, in the powder coating treatment or smearing treatment, in violation of the technical common sense of the industry, even if the dry weight per 150 g of rice seeds is 0.3 to 0.7 g, which is usually half the degree after sowing, the sufficient effect can be achieved. Characterized.

Further, the present invention may be subjected to seed treatment with other rice disease pest control agents simultaneously or before and after the application, depending on the requirements. Other rice disease pest controlling agents mentioned herein include, for example, Oxolinic acid, Prochloraz, Ipconazole, copper hydroxide, Triflumizole, and autumn. Fungicides such as thiuram, pefurazoate, benomyl, alkaline copper chloride, Fludioxonil, etc. Trichoderma atroviride, Talaromyces flavus An effective microorganism showing rice disease control activity; an insecticide such as MEP, Cartap, imidacloprid, etc., but not limited thereto, as long as it can be applied to seed treatment of rice pests The control agent can be used arbitrarily.

Among the above, particularly effective microorganisms are bacteria themselves, and when used in combination with other fungicides, there is often a problem of deactivation. However, since Compound 1 does not affect microorganisms such as Trichoderma atroviride, it can be used in combination.

In addition, when Compound 1 and other rice disease pest control agents are simultaneously subjected to seed treatment, each individual form of the active ingredient or its preparation is prepared separately. The composition of the agent may also be used in the form of a mixture of on-site blends, that is, in the form of a tank mix, and may also be used in the form of a single preparation composition pre-packaged with a mixture of two active ingredients. State, that is, the type of premix.

The rice seeds subjected to seed treatment are sown in a nursery box covered with soil according to the usual method, so that they can be germinated under appropriate management. For each seedling box of 30 cm × 60 cm, the amount of seeded rice is usually 100 to 200 g, preferably 150 g.

Or the seed treated rice seeds are directly sown in paddy fields. At this time, for every 10 acres of paddy fields, the amount of seeded rice is usually 2000-4000 g, preferably 3000 g.

The present invention is because the disease control effect is continued from the nursery period to the harvest period by the aforementioned treatment, so after so sowing, especially in the late growth stage of the rice (for example, 15 days before the earing and 25 days after the earing), It is also characterized by no need to re-process disease prevention and treatment. In addition, the disease pest control treatment may not be carried out during all growth and development after sowing, and the disease pest control treatment is not restricted after sowing.

Thus, the rice disease control method of the present invention retains the operational convenience of the so-called seed treatment type, and overcomes the problem of the treatment type, which is very effective for rice safety, economy, long-term residual effect, and the like. And practical.

Hereinafter, the embodiments of the present invention will be described, but the present invention is not limited to the embodiments, and various modifications can be made within the technical idea of the present invention.

In the examples and comparative examples described later, "parts" means "parts by mass". In addition, about the varieties of the rice seeds, the samples 1 to 4 and the comparative examples 1 to 7 were "one eye", and the examples 5 to 6 and the comparative examples 8 to 9 were "Koshihikari".

Example (Formulation Example 1)

By using 85 parts of the compound, 1 part of the alkylbenzenesulfonate, 5 parts of the lignosulfonate, 4 parts of the polyvinyl alcohol and 5 parts of the diatomaceous earth, the mixture is pulverized by using an impact mill. A hydrating agent containing 85% of Compound 1 was obtained.

(Formulation Example 2)

By mixing 50 parts of compound 1, 5 parts of polyoxyethylene alkyl phenyl ether, 6 parts of lignosulfonate, 0.24 parts of xanthan gum, 0.02 parts of dimethyl polyoxane and 38.74 parts Water was pulverized using a wet pulverizer using glass beads as a pulverization medium to obtain an aqueous suspension containing 50% of Compound 1.

(Comparative Example 1)

A commercially available granular hydrating agent: the trade name "Side strip Oryzaemate granule hydrating agent (product of Meiji Seika Pharma Co., Ltd.)" was supplied for the test. This product contains 48% of Probenazole as a disease of rice. Harm control agent.

(Comparative Example 2)

2 parts of the compound 1, 0.35 parts of the alkylbenzene sulfonate, 3 parts of the water-soluble starch and 91.65 parts of the clay are added to an appropriate amount of water, and then kneaded, using an extrusion granulator, the pore diameter is 0.8. Mm filter extrusion granulation. Using a fluidized bed dryer, drying was carried out at a product temperature of 70 ° C, and 2% of Compound 1 was obtained by screening.

(Comparative Example 3)

A commercially available granular hydrating agent: trade name "Firstorizepurinsu granule 6 (product of Meiji Seika Pharma Co., Ltd.)" was supplied for the test. This product contains 20% of Probenazole as a disease control agent for rice, and contains 0.6% of the insecticide FIPRONIL.

(Example 1)

10 g of dried rice seeds and 67 μl of water were mixed to make the rice seeds moist. 0.05 g of the hydrating agent of Formulation Example 1 (0.043 g of Compound 1 corresponding to 0.64 g per 150 g of rice seeds) was added thereto, and the active ingredients of the rice seed powder were thoroughly mixed. The rice seeds were immersed in 40 ml of water, and after soaking for 1 day at 15 ° C, the water was changed and the seeds were soaked for 4 days. Next, the water was changed to warm water, and germination treatment was carried out at 30 ° C for 1 day. 3.7 g of this rice seed was sown in a plastic cup having a diameter of 7.5 cm filled with soil.

(Example 2)

The aqueous suspension of Formulation Example 2 was diluted 7.5 times with water. 0.3 ml of the above dilution was added to 10 g of dried rice seeds (0.020 g of Compound 1, equivalent to 0.30 g per 150 g of rice seeds), mixed thoroughly, and the active ingredients were applied to the rice seeds. The rice seeds were immersed in 40 ml of water, and after soaking for 1 day at 15 ° C, the water was changed and the seeds were soaked for 4 days. Next, the water was changed to warm water, and germination treatment was carried out at 30 ° C for 1 day. 3.7 g of this rice seed was sown in a plastic cup having a diameter of 7.5 cm filled with soil.

(Example 3)

The hydrating agent of Formulation Example 1 was diluted 200 times with water. 10 g of dried rice seeds were immersed in 20 ml of the aforementioned dilution solution (0.085 g of compound 1 corresponding to 1.3 g per 150 g of rice seeds), and after soaking for 1 day at 15 ° C, the drug solution was discarded, and 40 ml of the solution was added. Water, soaked for 4 days at 15 °C. Next, the water was changed to warm water, and germination treatment was carried out at 30 ° C for 1 day. 3.7 g of this rice seed was sown in a plastic cup having a diameter of 7.5 cm filled with soil.

(Example 4)

10 g of dried rice seeds were immersed in 40 ml of water, and after soaking for 1 day at 15 ° C, the water was changed and the seeds were soaked for 4 days. Next, the water was discarded, and 20 ml of the hydrating agent of Formulation Example 1 was diluted with warm water to 200 times the chemical solution (0.085 g of Compound 1, equivalent to 1.3 g per 150 g of rice seed), and germinated at 30 ° C. Handle for 1 day. 3.7g of this rice seed, sowing A plastic cup with a diameter of 7.5 cm filled with soil.

(Example 5)

150 g of dried rice seeds and 1 ml of water were mixed to make the rice seeds moist. 0.75 g of the hydrating agent of Formulation Example 1 (0.64 g of Compound 1) was added thereto, and the mixture was thoroughly mixed to apply the active ingredient to the rice seed powder. The rice seeds were immersed in 1 L of water, and after soaking for 1 day at 15 ° C, the water was changed and the seeds were soaked for 4 days. Next, the water was changed to warm water, and germination treatment was carried out at 30 ° C for 1 day. The total amount of this rice seed was sown in a seedling box of 30 cm × 60 cm filled with soil.

(Example 6)

The aqueous suspension of Formulation Example 2 was diluted 7.5 times with water. 4.5 ml of the aforementioned dilution was added to 150 g of dried rice seeds (0.30 g of Compound 1), and the mixture was thoroughly mixed, and the active ingredients were applied to the rice seeds. The rice seeds were immersed in 1 L of water, and after soaking for 1 day at 15 ° C, the water was changed and the seeds were soaked for 4 days. Next, the water was changed to warm water, and germination treatment was carried out at 30 ° C for 1 day. The total amount of this rice seed was sown in a seedling box of 30 cm × 60 cm filled with soil.

(Comparative Example 1)

Instead of the hydrating agent of Formulation Example 1, the granular hydrating agent ground of Control 1 (0.024 g of Probenazole, equivalent to 0.36 g per 150 g of rice seed) was used. The remaining steps are performed with Example 1 The same operation.

(Comparative Example 2)

Instead of the aqueous suspension of Formulation Example 2, the granular hydrating agent ground of Control 1 was used as a chyle (0.019 g of Probenazole, equivalent to 0.29 g per 150 g of rice seed). The remaining steps are the same as in Embodiment 2.

(Comparative Example 3)

Instead of the hydrating agent of Formulation Example 1, the granular hydrating agent of Control 1 (0.048 g of Probenazole, equivalent to 0.72 g per 150 g of rice seed) was used. The remaining steps are the same as in the third embodiment.

(Comparative Example 4)

Instead of the hydrating agent of Formulation Example 1, the granular hydrating agent of Control 1 (0.048 g of Probenazole, equivalent to 0.72 g per 150 g of rice seed) was used. The remaining steps are the same as in Embodiment 4.

(Comparative Example 5)

10 g of dried rice seeds were immersed in 40 ml of water, and after soaking for 1 day at 15 ° C, the water was changed and the seeds were soaked for 4 days. Next, the water was changed to warm water, and germination treatment was carried out at 30 ° C for 1 day. 3.7g of this rice seed, sowing A plastic cup having a diameter of 7.5 cm was filled in the soil, and 1.2 g of the granule of the control agent 2 (0.025 g of the compound 1 equivalent to 1.0 g per 150 g of the rice seed) was further treated.

(Comparative Example 6)

10 g of dried rice seeds were immersed in 40 ml of water, and after soaking for 1 day at 15 ° C, the water was changed and the seeds were soaked for 4 days. Next, the water was changed to warm water, and germination treatment was carried out at 30 ° C for 1 day. 3.7 g of this rice seed was sown in a plastic cup filled with 7.5 cm in diameter, and then treated with 1.2 g of the granule of the control agent 3 (0.25 g of Probenazole, equivalent to 150 g of rice seed per 10g).

(Comparative Example 7)

10 g of dried rice seeds were immersed in 40 ml of water, and after soaking for 1 day at 15 ° C, the water was changed and the seeds were soaked for 4 days. Next, the water was changed to warm water, and germination treatment was carried out at 30 ° C for 1 day. 3.7 g of this rice seed was sown in a plastic cup having a diameter of 7.5 cm filled with soil.

In addition, the crop of Comparative Example 7 is sometimes referred to as "no treatment zone".

(Comparative Example 8)

150 g of dried rice seeds were immersed in 1 L of water, and after soaking for 1 day at 15 ° C, the water was changed and then soaked for 4 days. Next, the water was changed to warm water, and germination treatment was carried out at 30 ° C for 1 day. The total amount of this rice seed was sown in a seedling box of 30 cm × 60 cm filled with soil, and then 50 g of the control agent 2 was treated. A granule (corresponding to 1.0 g of Compound 1).

(Comparative Example 9)

150 g of dried rice seeds were immersed in 1 L of water, and after soaking for 1 day at 15 ° C, the water was changed and then soaked for 4 days. Next, the water was changed to warm water, and germination treatment was carried out at 30 ° C for 1 day. The total amount of this rice seed was sown in a seedling box of 30 cm × 60 cm filled with soil.

In addition, the crop area of Comparative Example 9 is sometimes referred to as "no treatment zone".

(Test Example 1)

The plastic cups of Examples 1 to 4 and Comparative Examples 1 to 7 were placed in a plastic cup set at 30 ° C for 3 days to cause germination, and the germination condition at that time point was confirmed. The result is shown in Figure 1. Next, the cup was moved to a greenhouse and managed at 20 °C. After 14 days of sowing, a general investigation was made on the growth and development of the crop height, and the degree of growth and development inhibition was evaluated in 11 stages of 0 (equivalent to no treatment area) to 10 (dead). The results are shown in Table 1.

The method of each of the examples was considered to be non-phytotoxic, and showed the same safety as Comparative Example 5 (planting of the seedling box) for the treatment of the rice using Compound 1 at the time of sowing. On the other hand, in Comparative Example 6 which was treated at the time of seeding, the method of the comparative example of culling heat was not problematic, but in Comparative Examples 1 to 4 in which seed treatment was carried out, it was considered that even if the amount of heat treatment for culling did not reach the above-mentioned Comparative Example 6 In one part, all of them still have phytotoxicity such as delayed sprouting or inhibition of growth and development.

(Test Example 2)

The seedling boxes of the examples 5 to 6 and the comparative examples 8 to 9 were overlaid, and the temperature-increasing seedling set at 30 ° C was placed for 3 days to cause germination. After that, the nursery box was moved into the plastic greenhouse for 7 days, and then the seedlings were exposed for 1 day. The rice grown to the 3~4 leaf stage was transplanted to the 0.5-acre Zhanshui paddy field. After 58 days of transplantation, the area of the leaf rice fever of each plant was evaluated for each crop area of 40 plants, and the lesion area was evaluated based on the criteria shown in Table 2 below. The ratio of the area of the lesion was determined, and the price of the control was calculated. The results are shown in Table 3.

In the method of each of the examples, the amount of the drug used was less than that of Comparative Example 8 (the seedling box application) of the compound 1 at the time of sowing, and the same control effect was exerted on the leaf rice fever.

The abstract of the present invention will be described later.

That is, the present invention provides high safety to rice and is simple and It is effective, labor burden is small, and it can be used for the prevention and treatment of rice diseases.

Next, germination is carried out by using 3-(3,4-dichloroisothiazol-5-ylmethoxy)-1,2-benzothiazole-1,1-dioxide as an active ingredient of a pesticide composition. The former rice seed is subjected to at least one treatment selected from the group consisting of immersion treatment, powder coating treatment, smearing treatment, and spray treatment, and the rice does not cause phytotoxicity, and the disease control effect can be continued over a long period from the germination of the rice seed to the harvest.

[Fig. 1] A person who obtained the soils of Examples 1 to 4 and Comparative Examples 1 to 6 and covered the soil, and confirmed the germination condition after 3 days at 30 ° C (the photograph of the substitute). Among the 6 crop areas in each photo, the left 3 areas were treated areas, and the right 3 areas were untreated areas (control).

Claims (2)

A rice disease control method characterized by using 3-(3,4-dichloroisothiazol-5-ylmethoxy)-1,2-benzothiazole-1,1 as a compound shown in the following formula 1. - a pesticide composition as an active ingredient, which is subjected to a powder coating treatment or a smear treatment, and is treated at a ratio of 0.3 to 0.7 g of the active ingredient per 150 g of rice seeds. Prevention and control of rice diseases from the seedling stage to the harvest period without causing phytotoxicity of rice, and no need for disease control treatment in the late stage of rice growth and development. For example, the method of claim 1 of the patent scope is for controlling rice rice fever.