KR101902041B1 - Method for controlling diseases in rice plant - Google Patents

Abstract

(PROBLEMS TO BE SOLVED BY THE INVENTION) [PROBLEMS] To provide a method for controlling rice disease, which has high safety against rice and which can achieve a sufficient effect with a simple and efficient work load.
(Solution) A pesticidal composition comprising 3- (3,4-dichloroisothiazol-5-ylmethoxy) -1,2-benzothiazole-1,1-dioxide as an active ingredient was used, At least one treatment selected from the group consisting of immersion treatment, pulverization treatment, smear treatment and spraying treatment is carried out so as to prevent the generation of a disease on the rice and prevent the disease from spreading from the germination of the rice seed to the harvesting period Can be continued.

Description

[0001] METHOD FOR CONTROLLING DISEASES IN RICE PLANT [0002]

The present invention relates to a method for controlling disease in rice. More particularly, the present invention relates to a method for controlling the disease of rice by directly acting an effective ingredient on rice seeds.

In rice farming, rice disease and its countermeasures are important issues regardless of age. Various active ingredients showing activity to control rice disease have been studied so far and many rice pest control agents have been developed and commercialized.

Such rice pest control agents take various forms of application according to the properties designed as pesticide formulations. In other words, it is possible to apply the foliar spray applied directly to the foliage part, the sleeping application to spray on the water surface of the munon, the seedling box application to spray directly on the seedling box of the follicular growth before the bonon transplantation, And seed treatment for directly applying the agent to rice seed before germination.

The differences in the above-mentioned application forms differ in quality of work relating to the application of pesticides. In recent years, in Japan, the aging population of aged workers and the aging of the average age are prominent, and the reduction of labor load in agricultural work is a pressing need in Japan. Therefore, the work efficiency is excellent and efficient control technology of pests and weeds Methods have become indispensable. Among the above application forms, seed treatment is one of the easiest methods.

In rice farming, a preliminary process for promoting the germination of rice seeds is usually performed prior to the seeding of rice seeds. That is, the rice seeds are immersed in cold water at about 15 캜, and the water is absorbed into rice seeds continuously for about 6 days while water is appropriately exchanged. Then, the rice seeds are immersed in hot water around 30 캜 for about 24 hours And a heat process is performed. In the seed treatment, the application of the drug is carried out before or during the step of the seed treatment.

If the seed treatment is further subdivided, seed dipping using the chemical solution into which the medicament has been added, seed dressing using the powdered medicament in the rice seed before the preparation process, , And the treatment of seed smear and seed spraying by dropping or spraying the water-dissolved medicines in rice seeds before the forging process in the same manner.

In the seed immersion, it is necessary to add a predetermined amount of medicament to the water to be used in the immersion process or the submerged process, and to stir the medicament so as to be a uniform chemical solution, but the rest of the work is not different from the conventional preparation process. On the other hand, in the treatment of the pulverization, the smearing and the spraying, rice seeds and a predetermined amount of medicines are put into a commercially available seed treatment apparatus, and the discharged rice seeds are supplied to the preparation process. Either way, it is very easy compared to other methods of spraying the drug onto the vast innards. Thus, reduction of labor load in rice cultivation is expected by use of a rice pest control agent capable of seed treatment, and several examples such as the method described in Patent Document 1 are shown.

However, the seed treatment is a method of directly contacting a high concentration of the drug against seeds that are the most immature and sensitive state of the rice for a lifetime, so that there is a problem that it is liable to generate a weakness. Therefore, there are several medicines that are theoretically available for seed treatment. However, there is a very limited number of medicines made up to the registration of pesticides because of the high safety of rice in seed treatment at present, .

In addition, the application form called seed treatment is characterized in that the period from when the medicament is treated to when the occurrence of rice blight is met is longer than other control methods. As a result, there is a problem in that the effectiveness of the seed treatment-treated active ingredient is not maintained with respect to the rice blight occurring at a relatively late period (for example, late rice growth period), and sufficient control effect can not be exhibited. Therefore, the control of rice disease control by the present seed treatment is carried out only for the purpose of controlling the rice blight to the yummy field. As for the rice blight occurring after that, the agricultural work for spraying the medicines to the rice plant is required separately before and after the occurrence of the rice blight of the target, and the reduction of the labor load due to the seed treatment is still insufficient.

In addition, the treatment of the powder, the smear treatment and the like also have a problem in the physical utilization rate of the effective ingredient. By these treatments, even if the active ingredient is adhered to the surface of the rice seed, most of the active ingredients are washed out in a series of operations because the rice seeds are taken out in water several times during the preliminary step or the like. This is true for the immersion treatment, except for the immersion in the final stage of the preparation process. Therefore, in these treatments, in order to obtain a sufficient control effect, an excess amount of the effective component predicted for the above-mentioned oil fraction is required in addition to the original necessary amount of the effective component. This means that the seed treatment (particularly, the treatment of the powder and the smear treatment) requires more drug than the method of spraying the drug into the non-nano, and contributing to the labor saving (labor saving) of the agricultural work can be evaluated , It can not be denied that it is an economically disadvantageous method.

On the other hand, as one of the active ingredients of the rice pest control agent, 3- (3,4-dichloroisothiazol-5-ylmethoxy) -1,2-benzothiazole-1,1- ) Is known (Patent Document 2). However, the effectiveness, the application amount, the weakness (safety) and the like when compound 1 is applied to rice seeds have not been studied in detail, and the practicality of compound 1 as a seed treatment agent is completely unclear.

Japanese Patent Application Laid-Open No. 2001-342105 International Publication No. 2007/129454

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a method for controlling rice disease, which has high safety for rice and is simple, efficient, low in labor load, do.

In order to achieve the above object, the present inventors have intensively studied from various aspects. As a result, the inventors of the present invention have found that a method in which Compound 1 is directly applied to rice seeds before germination does not cause any harm to rice, The present inventors have found out that the effect of controlling the disease can be maintained over a long period of time, and particularly, the effect of controlling the disease can be exerted with a smaller amount of the drug than the method of spraying the drug into the non- I have come to completion.

That is, the embodiment of the present invention is as follows.

(1) An agricultural chemical composition comprising a compound represented by the following general formula (1), 3- (3,4-dichloroisothiazol-5-ylmethoxy) -1,2-benzothiazole-1,1- And at least one treatment selected from the group consisting of immersion treatment, pulverization treatment, smear treatment and spraying treatment is applied to rice seeds before sowing by using the above-mentioned method.

(2) The method according to (1), wherein the rice seed before sowing is treated or smoothed.

(3) Using 3- (3,4-dichloroisothiazol-5-ylmethoxy) -1,2-benzothiazole-1,1-dioxide in a ratio of 0.3-0.7 g per 150 g of rice seed (2). ≪ / RTI >

(4) The method according to any one of (1) to (3), which is a control for rice blast disease.

(5) The method according to any one of (1) to (4), wherein no pest control treatment is carried out in the later stage of growth of rice (for example, from 15 days before heading to 25 days after heading) Lt; / RTI >

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to effectively prevent rice blight from occurring with a low labor load without accompanied by the weakness of rice. In particular, it exhibits an excellent effect on rice blast fungus, and it is also possible to control rice blast fungus caused by a drug resistant bacterium which is a problem in recent years. In addition, since this disease control effect lasts until reaching the harvest time from the seedling stage, no additional disease control work is required in the later stage of rice growth. In the embodiment of the present invention in which the powder treatment or the smear treatment is performed, it is more effective in terms of safety and economical efficiency since it is possible to prevent the rice blight from being treated with a small amount of medicament rather than the conventional method of controlling.

Fig. 1 shows the results obtained in Examples 1 to 4 and Comparative Examples 1 to 6 and showing the emergence state after 3 days at 30 占 폚 (Fig. Among the six crops in the photographs of each example, the left three digits are the treatment and the right three digits are the control (control).

In the present invention, 3- (3,4-dichloroisothiazol-5-ylmethoxy) -1,2-benzothiazole-1,1-dioxide, which is a compound represented by the following general formula (1), is used as an active ingredient. The method for producing this compound (hereinafter also referred to as compound 1) is disclosed in Patent Document 2, and there is no particular trouble at the time of acquisition.

[Chemical Formula 1]

In the present invention, at least one treatment selected from immersion treatment, powder treatment, smear treatment and spray treatment is applied to rice seeds before sowing by using an agricultural chemical composition (pesticide preparation) containing Compound 1 as an active ingredient. The immersion treatment is exemplified by a method of using a chemical solution into which a medicine is added for one batch of water used in the preparation process. The treatment of the powder can be exemplified by a method in which the powdered medicament is applied to rice seeds before the forging process, and the smearing treatment or the spraying treatment is exemplified by a method of dropping or spraying the medicament dissolved in water in the rice seed before the preparation process.

The compound 1 itself may be used in the form of a pharmaceutical agent. If desired, an additive component generally used as an agricultural chemical auxiliary agent may be compounded into the compound 1 to form an emulsion, a powder, a wettable powder, a granular wettable powder, The composition thus prepared may be used. In the latter case, a desired formulation may be selected and used in view of the actual treatment mode. For example, if a seed powder is to be applied, it is necessary to adhere the powder of the compound to the seed, so that a bulk preparation composition such as powder is preferable. On the other hand, in seed immersion, seed smearing and seed spraying, since a drug is diluted with water and used at a predetermined concentration, a liquid preparation composition such as an emulsion or a flowable composition or a wettable powder or granule A solid preparation composition such as a wetting agent is easy to use. However, the combination with the shape and the treatment method is not limited to the above.

Examples of the above agricultural chemical auxiliary agents include carriers such as solid carriers or liquid carriers, surfactants, binders, tackifiers, thickeners, colorants, spreading agents, electrodeposition agents, cryoprotectants, anticorrosive agents, . Depending on the necessity, a preservative, a plant part or the like may be used as an additive component. These additive components may be used alone or in combination of two or more.

Examples of the solid carrier include natural minerals such as quartz, clay, kaolinite, pyrophyllite, sericite, talc, bentonite, acidic clay, attapulgite, zeolite and diatomaceous earth; calcium carbonate, ammonium sulfate, sodium sulfate, potassium chloride Organic solid carriers such as synthetic silicic acid, synthetic silicate, starch, cellulose, and plant powder; and plastic carriers such as polyethylene, polypropylene, and polyvinylidene chloride.

Examples of the liquid carrier include monohydric alcohols such as methanol, ethanol, propanol, isopropanol and butanol, polyhydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol, hexylene glycol, polyethylene glycol, polypropylene glycol and glycerin Polyhydric alcohol compounds such as polyhydric alcohols, alcohols and propylene glycol ethers, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone and cyclohexanone, ethyl ether, dioxane, ethylene glycol monoethyl ether, Aliphatic hydrocarbons such as normal paraffin, naphthene, isoparaffin, kerosene and mineral oil; aromatic hydrocarbons such as benzene, toluene, xylene, solvent naphtha and alkylnaphthalene; aromatic hydrocarbons such as dichloro Halogenated hydrocarbons such as ethane, chloroform and carbon tetrachloride; ethers such as ethyl acetate, diisopropyl phthalate , Amides such as dimethylformamide, diethylformamide, dimethylacetamide and N-alkylpyrrolidinone, and the like, and the like, and the like, Nitrates such as acetonitrile, sulfur compounds such as dimethylsulfoxide, vegetable oils such as soybean oil, rapeseed oil, cottonseed oil and castor oil, and water.

Examples of the surfactant include, for example, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, sucrose fatty acid esters, polyoxyethylene fatty acid esters, polyoxyethylene resin acid esters, polyoxyethylene fatty acid diesters, polyoxyethylene alkyl Ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene dialkyl phenyl ether, polyoxyethylene alkyl phenyl ether formalin condensate, polyoxyethylene polyoxypropylene block polymer, alkyl polyoxyethylene polypropylene block polymer ether, polyoxyethylene fatty acid Amide, polyoxyethylene fatty acid biphenyl ether, polyalkylene benzyl phenyl ether, polyoxyalkylene tiryl phenyl ether, acetylenediol, polyoxyalkylene-substituted acetylene diol, polyoxyethylene castor oil, polyoxyethylene hardened castor oil and the like Nonionic interfacial bow A polyoxyethylene alkylphenyl ether sulfate, a polyoxyethylene styrylphenyl ether sulfate, an alkylbenzenesulfonate salt, a ligninsulfonate salt, an alkylsulfosuccinate salt, a naphthalenesulfonic acid salt, an alkyl naphthalenesulfonic acid salt, Salts of naphthalenesulfonic acid formalin condensates, salts of alkylnaphthalenesulfonic acid formalin condensates, fatty acid salts, polycarboxylates, N-methyl fatty acid sarcosinates, resin acid salts, polyoxyethylene alkyl ether phosphates, polyoxyethylene alkylphenyl ether phosphates Anionic surfactants such as laurylamine hydrochloride, stearylamine hydrochloride, oleylamine hydrochloride, stearylamine acetate, stearylaminopropylamine acetate, alkyltrimethylammonium chloride, alkyldimethylbenzalkonium chloride, polyoxyethylene Cationic surfactants such as alkylamine salts, alkyl Amphoteric surfactants such as polyvinyl alcohol, polyvinyl alcohol, polyvinyl alcohol, polyvinyl alcohol, polyvinyl alcohol, polyvinyl alcohol, polyvinyl alcohol, polyvinyl alcohol, And fluorine-based surfactants such as telomer alcohol.

Examples of the binder or tackifier include carboxymethylcellulose or its salt, dextrin, water-soluble starch, xanthan gum, guar gum, sucrose, polyvinylpyrrolidone, gum arabic, polyvinyl alcohol, polyvinyl acetate, polyacrylic acid Sodium, polyethylene glycol having an average molecular weight of 6,000 to 20,000, polyethylene oxide having an average molecular weight of 100,000 to 5,000,000, sepharin, and lecithin.

Examples of the thickener include water-soluble polymers such as xanthan gum, guar gum, welan gum, carboxymethyl cellulose, polyvinylpyrrolidone, carboxyvinyl polymer, acrylic polymer, starch compound and water-soluble polysaccharide; high purity bentonite, fumed silica And the like.

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

Examples of the positively charged agent include a silicone surfactant, a cellulose powder, a dextrin, a processed starch, a polyaminocarboxylic acid chelate compound, a crosslinked polyvinylpyrrolidone, a copolymer of maleic acid and styrene, a (meth) , A polymer composed of a polyhydric alcohol and a half ester of a dicarboxylic acid anhydride, and a water-soluble salt of polystyrene sulfonic acid.

Examples of the electrodeposition agent include paraffin, terpene, polyamide resin, polyacrylate, polyoxyethylene, wax, polyvinyl alkyl ether, alkylphenol formalin condensate, synthetic resin emulsion and the like.

Examples of the anti-freezing agent include polyhydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol and glycerin, and urea.

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

Examples of the disintegrating agent include sodium tripolyphosphate, sodium hexametaphosphate, stearic acid metal salt, cellulose powder, dextrin, methacrylic ester-based copolymer, polyvinylpyrrolidone, polyaminocarboxylic acid chelate compound, Maleic anhydride copolymer, starch-polyacrylonitrile graft copolymer, and the like.

Examples of the decomposition inhibitor include a drying agent such as zeolite, quicklime and magnesium oxide; an ultraviolet absorber such as salicylic acid or benzophenone; sulfuric acid, acetic acid, sodium acetate, phosphoric acid, ammonium hydrogenphosphate, potassium dihydrogenphosphate, sodium phosphate , A pH adjusting agent such as boric acid, sodium borate, sodium hydrogen carbonate, sodium carbonate, sodium hydroxide or a mixture thereof.

Preservatives include, for example, potassium sorbate and 1,2-benzthiazoline-3-one.

Examples of plants include sawdust, coconut shells, cornstalks, and tobacco stalks.

Such a medicament can be produced by a conventional method, and for example, the following production methods can be mentioned.

(1) A method for producing an emulsion which dissolves Compound 1, a surfactant, and other agricultural chemicals auxiliary agents, which are added as desired, in a liquid carrier such as an organic solvent.

(2) Compound 1, solid carrier and other agricultural chemicals auxiliary agent added according to the desired amount are mixed and pulverized by an appropriate pulverizer.

(3) A method for producing a wettable powder by mixing and pulverizing compound 1, a surfactant, a solid carrier, and other agricultural chemicals auxiliary agents to be added according to a desired amount using a suitable pulverizer.

(4) A suitable amount of water is added to a mixture of compound (1), a surfactant, and a pesticide adjuvant to be added according to a desired amount (which may be partially or entirely pulverized) (Granulation) from a screen obtained by extruding the granulated product and drying the granulated product.

(5) A process for producing a floble, which comprises dispersing compound 1, a surfactant and other agricultural chemicals auxiliary agents added according to desired ones in a liquid carrier such as water, and pulverizing the mixture with an appropriate pulverizer.

The content of the compound 1 in the medicament is generally selected in the range of 30 to 95%, preferably 50 to 90%, based on the total amount. The content of each pesticide adjuvant varies depending on the content of the compound 1 and the selected formulation, but is usually selected within the range of 5 to 70%, preferably 10 to 50%. Particularly, in the preparation composition for providing the seed powder, seed smear or seed spray, it is preferable that the surface area of the rice seed to which the medicament is adhered is limited so that the compound 1 (for example, 50% ) Is preferably 80% or more.

The amount of the compound 1 to be used in the present invention is 0.1 to 1.3 g, preferably 0.1 to 1 g, and more preferably 0.3 to 0.7 g, per 150 g of the dry weight of the rice seed. Particularly, in the treatment or smear treatment of the pulp, 0.3 to 0.7 g per 150 g of the dry weight of the rice seed, which is about half of the usual seeding amount after sowing, is sufficient in comparison with the technical knowledge in the related art.

In the present invention, another rice pest control agent may be treated with seeds at the same time as, or before or after the implementation, as desired. Other rice pest control agents mentioned herein include, for example, oxolinic acid, prochloraz, iprconazole, dicum hydroxide, triflumizole, thiuram, perpurajoate, benomyl, basic copper chloride, Fungicides such as oxycodone, oxonyl, etc., useful microorganisms such as Tricodelma artroviride, Talaromyces flavus and the like that exhibit activity of controlling rice disease disease, and insecticides such as MEP, carthap, and imidacloprid. Any of the rice pest insect control agents applicable to the seed treatment may be optionally used.

Above all, the useful microorganism is a microorganism itself, and often has a problem of inactivating when mixed with other microbicides. However, since Compound 1 does not affect microorganisms such as Trichoderma atroviride, It can be used in combination.

When the compound 1 and the other rice pest control agent are simultaneously treated with seeds, the respective effective ingredient or the composition of the preparation thereof may be separately prepared and used in the form of a field combination to be mixed at the time of use, that is, in the form of a tank mix And may be applied in the form of a single preparation composition packaged as a mixture containing both active ingredients in advance, that is, a ready mix.

The rice seed subjected to the seed treatment may be sown by a conventional method, that is, by sowing the soil on the whole surface of the seedling box and germinating under appropriate management. The amount of rice seed sown per 30 cm x 60 cm seedling box is usually about 100 to 200 g, preferably about 150 g.

Alternatively, the rice seed subjected to the seed treatment may be directly sown on the rice plant. In this case, the amount of rice seed to be planted with non-arginine 10 is usually 2000 to 4000 g, preferably about 3000 g.

In the present invention, since the effect of controlling the disease caused by the treatment lasts from the seedling stage to the harvesting stage, it is possible to prevent the growth of rice after the sowing, especially during the growing stage of rice (for example, from 15 days before heading to 25 days after heading , It is also not necessary to carry out the pest control treatment again. In addition, it is also possible not to carry out the pest control treatment in all the growing periods after sowing, and conversely, the pest control treatment after sowing is not restricted again.

As described above, the rice pest control method of the present invention is very useful in overcoming the safety, economical efficiency and long-term stability of rice, which is a problem of the treatment mode, as it is, It is also practical.

Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to these embodiments, and various variations thereof are possible within the technical scope of the present invention.

In the following Examples and Comparative Examples, " part " means " part by mass ". For the rice seed varieties, "Hitombehore" was used in Examples 1 to 4 and Comparative Examples 1 to 7, "Koshihikari" was used in Examples 5 to 6 and Comparative Examples 8 to 9 ).

Example

(Formulation Example 1)

85 parts of Compound 1, 1 part of alkylbenzenesulfonic acid salt, 5 parts of ligninsulfonic acid salt, 4 parts of polyvinyl alcohol and 5 parts of diatomaceous earth were mixed and pulverized to obtain a wettable powder containing 85% of Compound 1.

(Formulation Example 2)

50 parts of Compound 1, 5 parts of polyoxyethylene alkyl phenyl ether, 6 parts of ligninsulfonic acid salt, 0.24 parts of xanthan gum, 0.02 part of dimethyl polysiloxane and 38.74 parts of water were mixed and pulverized using a wet grinder using glass beads as a pulverizing medium Thereby obtaining a floeble containing 50% of Compound 1.

(Control agent 1)

Commercially available granular wettability agent: trade name " Wako Durujemate Granule Wetting Agent (manufactured by Meiji Seika Farmer Co., Ltd.) " This product contains probenazole 48% as a rice pest control agent.

(Control agent 2)

An appropriate amount of water was added to 2 parts of Compound 1, 0.35 part of alkylbenzenesulfonate, 3 parts of water-soluble starch and 91.65 parts of clay, kneaded, and extruded and assembled from a screen having a diameter of 0.8 mm using an extrusion granulator. Dried at a product temperature of 70 캜 using a fluidized bed drier, and sieved to obtain a granule containing 2% of Compound 1.

(Control agent 3)

Commercially available granules: Trade name "First Origin Prince Granule 6 (manufactured by Meiji Seika Palmer Co.)" was published. This product contains 20% of provenazole as rice pest control agent and 0.6% of pesticide insecticide.

(Example 1)

10 g of dried rice seeds and 67 물 of water were mixed to wet rice seeds. 0.05 g of the wettable powder of Preparation Example 1 was added (0.043 g as Compound 1, 0.64 g per 150 g of rice seeds), and the active ingredient was added to rice seeds by well mixing. The rice seeds were soaked in 40 ml of water, soaked at 15 占 폚 for 1 day, and water was then exchanged for further 4 days. Subsequently, the water was exchanged with hot water, and treated at 30 占 폚 for 1 day. 3.7 g of this rice seed was inoculated in a plastic cup having a diameter of 7.5 cm filled with soil.

(Example 2)

The flowables of Preparation Example 2 were diluted 7.5-fold with water. 0.3 ml of the diluted solution was added to 10 g of dried rice seeds (0.020 g as Compound 1, 0.30 g per 150 g of rice seeds), and the active ingredient was smoothed on the rice seeds by well mixing. The rice seeds were soaked in 40 ml of water, soaked at 15 占 폚 for 1 day, and water was then exchanged for further 4 days. Subsequently, the water was exchanged with hot water, and treated at 30 占 폚 for 1 day. 3.7 g of this rice seed were inoculated in a plastic cup having a diameter of 7.5 cm filled with soil.

(Example 3)

The wettable powder of Preparation Example 1 was diluted 200-fold with water. 10 g of dried rice seeds were immersed in 20 ml of the diluted solution (0.085 g as Compound 1, 1.3 g per 150 g of rice seeds), soaked at 15 캜 for 1 day, then the chemical solution was discarded and 40 ml of water was added , And was soaked at 15 캜 for 4 days. Subsequently, the water was exchanged with hot water, and treated at 30 占 폚 for 1 day. 3.7 g of this rice seed were inoculated in a plastic cup having a diameter of 7.5 cm filled with soil.

(Example 4)

10 g of dried rice seeds were soaked in 40 ml of water, and after soaking at 15 캜 for 1 day, the water was exchanged and further dipped for 4 days. Subsequently, the water was discarded and 20 ml of the chemical solution diluted 200 times with hot water of formulation example 1 was added (0.085 g as compound 1, 1.3 g per 150 g of rice seeds) Respectively. 3.7 g of this rice seed were inoculated in a plastic cup having 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 wet rice seeds. To this was added 0.75 g of the wettable powder of Preparation Example 1 (0.64 g as Compound 1), followed by well mixing to disperse the active ingredient into rice seeds. The rice seeds were immersed in 1 L of water, soaked at 15 DEG C for 1 day, and then water was exchanged for further 4 days. Subsequently, the water was exchanged with hot water, and treated at 30 占 폚 for 1 day. The total amount of this rice seed was sown in a seedling box of 30 cm x 60 cm filled with soil.

(Example 6)

The flowables of Preparation Example 2 were diluted 7.5-fold with water. 4.5 ml of the diluted solution was added to 150 g of dried rice seeds (0.30 g as compound 1), and the active ingredient was applied to rice seeds by well mixing. The rice seeds were immersed in 1 L of water, soaked at 15 DEG C for 1 day, and then water was exchanged for further 4 days. Subsequently, the water was exchanged with hot water, and treated at 30 占 폚 for 1 day. The total amount of this rice seed was sown in a seedling box of 30 cm x 60 cm filled with soil.

(Comparative Example 1)

Instead of the wetting agent of Preparation Example 1, a granulated wettable powder of Control 1 was used (equivalent to 0.024 g as provenazole and 0.36 g per 150 g of rice seed). The rest of the procedure was carried out in the same manner as in Example 1.

(Comparative Example 2)

As a substitute for the flowable material of Preparation Example 2, a granulated wettable powder of Control 1 was used (equivalent to 0.019 g as provenazole and 0.29 g per 150 g of rice seed). The rest of the procedure was followed by the operation of Example 2.

(Comparative Example 3)

Instead of the wetting agent of Preparation Example 1, the granular wettability agent of Control 1 was used (0.048 g as provenazole and 0.72 g per 150 g of rice seeds). The rest of the procedure was carried out in the same manner as in Example 3.

(Comparative Example 4)

Instead of the wetting agent of Preparation Example 1, the granular wettability agent of Control 1 was used (0.048 g as provenazole and 0.72 g per 150 g of rice seeds). In the rest of the procedure, the same operation as in Example 4 was carried out.

(Comparative Example 5)

10 g of dried rice seeds were soaked in 40 ml of water, and after soaking at 15 캜 for 1 day, the water was exchanged and further dipped for 4 days. Subsequently, the water was exchanged with hot water, and treated at 30 占 폚 for 1 day. 3.7 g of this rice seed were seeded in a plastic cup having a diameter of 7.5 cm filled with soil and further treated with 1.2 g of granules of Control 2 (0.025 g as compound 1, 1.0 g per 150 g of rice seed) .

(Comparative Example 6)

10 g of dried rice seeds were soaked in 40 ml of water, and after soaking at 15 캜 for 1 day, the water was exchanged and further dipped for 4 days. Subsequently, the water was exchanged with hot water, and treated at 30 占 폚 for 1 day. 3.7 g of this rice seed were sown in a plastic cup of 7.5 cm in diameter filled with soil and further treated with 1.2 g of granules of Control 3 (0.25 g as provenazole, 10 g per 150 g of rice seed ).

(Comparative Example 7)

10 g of dried rice seeds were soaked in 40 ml of water, and after soaking at 15 캜 for 1 day, the water was exchanged and further dipped for 4 days. Subsequently, the water was exchanged with hot water, and treated at 30 占 폚 for 1 day. 3.7 g of this rice seed were inoculated in a plastic cup having a diameter of 7.5 cm filled with soil.

In addition, the crop classification of Comparative Example 7 may be referred to as " untreated soil ".

(Comparative Example 8)

150 g of dried rice seeds were immersed in 1 L of water, soaked at 15 DEG C for 1 day, and water was then exchanged for further 4 days. Subsequently, the water was exchanged with hot water, and treated at 30 占 폚 for 1 day. The total amount of the rice seeds was inoculated in a seedling box of 30 cm x 60 cm filled with soil, and further treated with 50 g of granules of Comparative preparation 2 (corresponding to 1.0 g as compound 1).

(Comparative Example 9)

150 g of dried rice seeds were immersed in 1 L of water, soaked at 15 DEG C for 1 day, and water was then exchanged for further 4 days. Subsequently, the water was exchanged with hot water, and treated at 30 占 폚 for 1 day. The total amount of this rice seed was sown in a seedling box of 30 cm x 60 cm filled with soil.

In addition, the crop classification of Comparative Example 9 may be referred to as " untreated soil ".

(Test Example 1)

The plastic cups of Examples 1 to 4 and Comparative Examples 1 to 7 were submerged and placed in a warming sowing machine set at 30 DEG C for 3 days for emergence and the emergence state at the time point was confirmed. The results are shown in Fig. The cup was then transferred to a greenhouse and maintained at 20 占 폚. After 14 days of sowing, the growth conditions of the crops were examined and the degree of growth inhibition was evaluated by an index of eleven stages from 0 (untreated) to 10 (dead). The results are shown in Table 1.

In each of the methods of the Examples, no weakening was observed, and the rice showed the same safety as that of Comparative Example 5 (for seedling application) of seedling treatment with Compound 1 using rice. On the other hand, the method of Comparative Example using provenazole did not cause any problem in Comparative Example 6 of the seeding treatment, but in Comparative Examples 1 to 4 in which the seed treatment was carried out, the treatment amount of provenaazole was less than 1/10 Despite the fact, all of them were found to be vulnerable to delay in emergence and inhibition of growth.

(Test Example 2)

The seedlings were bagged in the seedling boxes of Examples 5 to 6 and Comparative Examples 8 to 9, put in a warming sowing machine set at 30 DEG C for 3 days and then emerged. After that, the seedling box was transferred into a plastic house, and the rice grown for 3 days to 4 days was further transferred to fresh water-free 0.5 ars. The irradiation was conducted 58 days after the transplantation, and the degree of lesion of the leaf blast per leaf was evaluated as the lesion area according to the criterion of Table 2 shown below for 40 plants of each crop division, The control value was calculated. The results are shown in Table 3.

The method of each example demonstrated the same or better control effect against leaf blast disease, with a lower usage dose than that of Comparative Example 8 (for seedling box) treated with Compound 1 at the time of sowing.

The present invention is summarized as follows.

That is, the object of the present invention is to provide a method for controlling rice disease, which has high safety for rice, is simple, efficient, low in labor load, and can exhibit sufficient effect.

Then, using an agricultural chemical composition containing 3- (3,4-dichloroisothiazol-5-ylmethoxy) -1,2-benzothiazole-1,1-dioxide as an active ingredient, It is possible to maintain the effect of controlling the disease throughout the period from the germination of the rice seed to the harvesting of the rice without causing any harm to the rice by carrying out at least one treatment selected from the treatment, can do.

Claims (5)

An agricultural chemical composition comprising, as an active ingredient, 3- (3,4-dichloroisothiazol-5-ylmethoxy) -1,2-benzothiazole-1,1-dioxide, which is a compound represented by the following formula Characterized in that at least one treatment selected from the treatment of the rice seed before the treatment or the smear treatment is carried out and the treatment is carried out by using the effective ingredient in a proportion of 0.3 to 0.7 g per 150 g of the rice seeds Disease control method.
[Chemical Formula 1]

The method according to claim 1,
A method of controlling rice blast. 3. The method according to claim 1 or 2,
Characterized in that no pest control treatment is carried out at the later stage of growth of rice. delete delete

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