KR100359003B1 - Blast control agent and control method using same - Google Patents

Abstract

The present invention comprises granules containing 1 to 20% by weight of N- [1- (2,4-dichlorophenyl) ethyl] -2-cyano-3,3-dimethylbutanamide as an antifungal activity-imparting active ingredient. , A blast control agent used for rice seedlings on a box in a box, and a granulation agent is applied in the amount of 1 to 20 g of active ingredient per 1800 cm ^{2 of a} seedling of a rice seedling in a box.

Description

Blast control agent and control method using same

The present invention relates to a rice blast control agent and a method of controlling the blast disease using the same.

In order to improve the working efficiency of growing rice seedlings, a method of recently growing rice seedlings on a bed plate provided in a box has been recently developed. Therefore, there is a need for an effective control method for the rice seedlings.

To date, tricyclazole (5-methyl-1,2,4-triazolo [3,4-b] benzothiazole [hereinafter referred to as "compound (A)") and probenazole (3-allyl Oxy-1,2-benzthiazole-1,1-dioxide (hereinafter referred to as "compound (B)") has been known as an active ingredient of fungicides for blast diseases.

However, these compounds are not always satisfactory in terms of fungicidal effects.

Accordingly, it is an object of the present invention to develop a formulation and a method capable of efficiently controlling a rice blast of rice seedlings on a box bed.

Accordingly, the present invention refers to N- [1- (2,4-dichlorophenyl) ethyl] -2-cyano-3,3-dimethylbutanamide [hereinafter referred to as "compound (I)") as an antifungal activity-imparting active ingredient. ] A granule containing 1 to 20% by weight is provided.

It is also an object of the present invention to provide a method characterized in that the granules are applied in an amount of 1 to 20 g of active ingredient per 1800 cm ^{2 of the} bed plate in the box.

According to the present invention, the blast can be controlled for a long time without being affected by the kind of soil to be used, leakage of rice paddies, and the like. Although compounds of formula (I) are used at high concentrations, there is no problem of phytotoxicity to rice or subsequent crops.

In the present invention, the compound of general formula (I) used as an antifungal activity-imparting active ingredient can be prepared according to Japanese Patent Laid-Open No. 2-76846.

The granules of the invention are for example mixed with compound (I) as an active ingredient with a solid carrier and optionally with surfactants, dispersants, fixatives, stabilizers or mixtures thereof, and the mixture is kneaded with water, It can be prepared by granulating and then drying.

Examples of solid carriers include fine powders or clay granules (e.g. kaolin clay, diatomaceous earth, synthetic hydrated silicon oxide, fuvasami clay, bentonite, acid clay, etc.), other inorganic minerals (e.g. mica, quartz, sulfur, activated carbon, Calcium carbonate, hydrated silica, etc.), chemical fertilizers (eg, ammonium sulfate, ammonium phosphate, ammonium nitrate, urea, ammonium chloride, etc.).

Examples of surfactants include alkyl sulfates, salts of alkyl sulfonates, alkyl aryl sulfonates, alkyl aryl ethers, polyoxy ethylene compounds thereof, polyoxyethylene glycol ethers, polyhydric alcohol esters, sugar alcohol derivatives, and the like.

Examples of fixatives and dispersants include casein, gelatin, polysaccharides (e.g. starch powder, gum arabic, cellulose derivatives, alginic acid, etc.), lignin derivatives, bentonite, sugars, synthetic water soluble polymers (e.g. polyvinyl alcohol, polyvinyl pi Rollidone, polyacrylic acid, etc.), and the like.

Examples of stabilizers include PAP (isopropyl acid phosphate), BHT (2,6-di-tert-butyl-4-methylphenol), BHA (2-tert-butyl-4-methoxyphenol and 3-3 Mixtures of tert-butyl-4-methoxyphenol), vegetable oils, mineral oils, surfactants, fatty acids or esters thereof, and the like.

Granules of the present invention generally contain 60 to 99% by weight solid carrier. When additives such as surfactants, dispersants, fixatives and stabilizers are used, the amount of additives is 1 to 20% by weight, respectively. The total weight of the additive to be used is generally 1 to 20% by weight.

The granules of the present invention can generally be incorporated into the soil by spreading itself onto the soil surface in the box. Moreover, granules can also be used after mixing with pesticides, nematicides, fertilizers or soil conditioners, or simultaneously with these.

Examples of the active ingredients of the miscible pesticides are shown below together with their symbols.

Compound (C): 5-amino-1- [2,6-dichloro-4- (trifluoromethyl) phenyl] -4- (trifluoromethyl) sulfinyl-1H-pyrazole-3-carbonitrile [ Fipronil]

Compound (D): 1- (6-Chloro-3-pyridylmethyl) -N-nitroimidazolidon-2-xylideneamine [imidacloprid]

Compound (E): ethyl N- [2,3-dihydro-2,2-dimethyl-benzofuran-7-xyloxycarbonyl (methyl) aminothio] -N-isopropyl-β-alanineate [bene Benfuracarb]

Compound (F): S, S '-(2-dimethylaminotrimethylene) bis- (thiocarbomate) (cartap)

Compound (G): 4- (methylthio) phenyl dipropyl phosphate (propaphos)

Compound (H): 2,3-dihydro-2,2-dimethylbenzofuran-7-yl (dibutylaminothio) methyl carbamate (carbosulfen)

Compound (J): N- (6-chloro-3-pyridylmethyl-N-ethyl-N'-methyl-2-nitrovinylidenediamine (nitrazepam)

Compound (K): 4,5-dihydro-6-methyl-4- (3-pyridylmethyleneamino) -1,2,4-triazine-3 (2H) -one (pymetrozine)

When mixing the active ingredient of the compound (I) and the pesticide, the mixing ratio is generally 0.01 to 100 parts by weight, preferably 0.2 to 20 parts by weight based on 1 part of the compound (I).

The amount of granules to be applied is generally 1 to 20 g in terms of the active ingredient per one box (30 cm × 60 cm × 3 cm), ie 1800 cm 2.

The size and raw materials of the box to be used in the present invention are not limited. A representative example of such a box is 30 cm x 60 cm x 3 cm in size as described above.

Application of the granules is generally carried out in such a way that they are spread on a bedbed in which the rice seedlings are planted. Subsequently, the seedlings are watered and rice seedlings are transplanted into the paddy fields.

In the above operation, the blast bottle can be effectively controlled by transplanting rice seedlings into the paddy fields within 24 hours after irrigation to the granules applied bed.

Example

The present invention is listed in more detail as the following Preparation Examples and Test Examples, but the scope of the present invention is not limited thereto. In the formulation examples, “%” are all by weight unless otherwise indicated.

Formulation Example 1

1 part of compound (I), 1 part of synthetic hydrated silicon hydroxide, 2 parts of calcium lignin sulfonate, 30 parts of bentonite, and 66 parts of kaolin clay are sufficiently ground and mixed. Thereafter, water is added to the mixture to knead sufficiently, granulated and dried to obtain a 1% granule.

Formulation Example 2

2.5 parts of compound (I), 2 parts of sodium dioctyl sulfosuccinate, 1 part of synthetic hydrated silicon hydroxide, 30 parts of bentonite, and 64.5 parts of kaolin clay are sufficiently ground and mixed. This mixture is then kneaded sufficiently by adding water, granulated and dried to give 2.5% granules.

Formulation Example 3

5 parts of compound (I), 2 parts of sodium dioctyl sulfosuccinate, 1 part of synthetic water-containing silicon hydroxide, 30 parts of bentonite and 62 parts of kaolin clay are sufficiently ground and mixed. This mixture is then kneaded sufficiently by adding water, granulated and dried to give 5% granules.

Formulation Example 4

10 parts of compound (I), 2 parts of sodium dioctyl sulfosuccinate, 2 parts of synthetic hydrated silicon hydroxide, 30 parts of bentonite and 56 parts of kaolin clay are sufficiently ground and mixed. This mixture is then kneaded sufficiently by adding water, granulated and dried to give 10% granules.

Formulation Example 5

5 parts of compound (I), 5 parts of compounds (C) to (K), 1 part of synthetic hydrated silicon hydroxide, 2 parts of calcium ligninsulfonate, 30 parts of bentonite, and 57 parts of kaolin clay were thoroughly ground and mixed, and then water was added. After kneading well, the kneaded mixture is granulated and dried to give 5% granules for each compound.

Comparative Formulation Example 1

5 parts of compound (I), 14 parts of polyoxyethylene styrylphenyl ether, 6 parts of calcium dodecylbenzenesulfonate and 75 parts of xylene are sufficiently mixed to obtain a 5% emulsifiable concentrate.

Comparative Formulation Example 2

10 parts of compound (I), 14 parts of polyoxyethylene styrylphenyl ether, 6 parts of calcium dodecylbenzene sulfonate and 70 parts of xylene are sufficiently mixed to obtain a 10% emulsifiable concentrate.

The following examples show good control activity of the granules of the invention against blasting disease.

Biological Test Example 1: Wagner pot test

A box (30 cm × 60 cm × 3 cm) was filled with blended soil (Bonsol No. 2, manufactured by Koura Sangyo Co., Ltd.), and the dried Nihonbare was seeded in an amount of about 200 g per box. Twenty days after sowing, granule formulations obtained in a manner similar to that described in Formulation Examples 3 or 4, or emulsifiable concentrates formulated in a manner similar to that described in Comparative Formulation Examples 1 or 2, were homogeneous on the soil surface in the box. Scattered. After a little watering, five rice seedlings were implanted into Wagner Fort (1 / 5000are) filled with sandy soil (Takarazuka-shi, Hyogo-ken). Rice seedlings were continuously grown in a greenhouse where water leaked from the bottom of the Wagner pot at a rate of 3 cm per day. Four weeks after transplanting, the rice seedlings and other rice seedlings infected with the blast disease were kept in the greenhouse and kept wet so that the rice seedlings were infected by the blast pathogen. After 11 days of inoculation of the fungi, the incidence of blast pathogens on rice leaves was investigated according to the following criteria to obtain the control values according to the following formulas (1) and (2). In addition, the incidence of untreated areas was 68%.

(Formula 1)

In the above formula,

N is the number of rice leaves examined,

n1 to n4 represent the number of leaves having an incidence index of 1, 2, 4 or 8, respectively.

(Formula 2)

The results are shown in Table 1 below.

Biological Test Example: 2 Wagner Pot Test

Fill a box (30cmx60cmx3cm) with mixed soil (Bonsol No. 2, manufactured by Koura Sangyo Co., Ltd.) or sandy soil (Takarazuka-shi, collected from Hyogo-ken), and add dried Nihonbare (approx. 200g per box) It was sown in the amount of. Twenty days after sowing, the granules formulated in the same manner as described in Formulation Example 2 were evenly spread over the soil surface of the mother plate. After a little watering, Wagner pots (1/5000 are) filled with 5 rice seedlings from loam (Ohyama-cho, Seihaku-gun, Tottori-ken) or sandy soil (from Takarazuka-shi, Hyogo-Ken) After implantation, the cells were irrigated. Rice seedlings were continuously grown in a greenhouse where water leaked from the bottom of the Wagner pot at a rate of 3 cm per day. Three or six weeks after transplanting, rice seedlings were infected with blast pathogens in the same manner as described in Test Example 1.

After 11 days of inoculation, the incidence of blast pathogens on rice leaves was investigated in the same manner as described in Test Example 1 to obtain a control value. The results are shown in Table 2.

When using mixed soil in seedlings and loam after transplantation, the percentage of incidence in the untreated area was 98% in all cases from transplantation to fungal inoculation for 3 or 6 weeks. When using sandy soil after seedling and transplantation, in all cases where the period from transplantation to inoculation of fungi was 3 or 6 weeks, the incidence of untreated areas was 91%.

*: Period (week) from transplantation to inoculation of fungus

Biological Test Example 3: Field Test

A box (30 cm × 60 cm × 3 cm) was filled with blended soil (Bonsol No. 2, manufactured by Koura Sangyo Co., Ltd.), and the dried Nihonbare was seeded in an amount of about 200 g per box. 20 days after sowing, the granules formulated according to the same manner as described in Formulation Examples 2 to 4 were evenly spread on the soil surface in the box. After a little watering, the rice seedlings were machined into paddy fields (Kasai-shi, Hyogo-ken paddy fields) in the ratio of 2 boxes per are, according to the usual method. 12 and 21 days after transplantation, other rice seedlings infected with the blast disease were transplanted into rice fields around the test field to form infectious agents. After 41 days of transplantation, the incidence of the blast on rice leaves was examined for 50 weeks of plant per zone to obtain control values according to the following criteria. The incidence of untreated areas was 70%.

Biological Test Example 4: Wagner Pot Test

A box (30 cm × 60 cm × 3 cm) was filled with blended soil (Bonsol No. 2, manufactured by Koura Sangyo Co., Ltd.), and the dried Nihonbare was seeded in an amount of about 200 g per box. 20 days after sowing, the granules formulated in the same manner as described in Formulation Example 5 were evenly spread over the soil surface. After a little watering, five rice seedlings were implanted into Wagner Fort (1/5000 are) filled with sandy soil (Takarazuka-shi, Hyogoken).

Rice seedlings were continuously grown in a greenhouse where water leaked from the bottom of the Wagner pot at a rate of 3 cm per day. Four weeks after transplanting, rice seedlings are left in the greenhouse with these rice seedlings infected with blast pathogens. After 11 days of inoculation, the incidence of the blast on rice leaves was investigated in the same manner as described in Test Example 1 to obtain a control value. The results are shown in Table 4.

The incidence of untreated areas (%) was 62%.

Claims (4)

1 to 20% by weight N- [1- (2,4-dichlorophenyl) ethyl] -2-cyano-3,3-dimethylbutanamide as an antifungal activity-imparting active ingredient, 60 to 98% by weight solid carrier, and A heat bottle control agent for use in rice seedlings on a box bed including a granule containing 1 to 20% of an additive selected from a surfactant, a dispersant, an immobilizing agent and a stabilizer. A method for controlling a blast bottle, characterized in that the granules according to claim 1 are applied in an amount of 1 to 20 g of active ingredient per 1800 cm ^{2 of the} bed plate in the box. The method of claim 2, wherein the granules are applied in a manner that spreads the granules. The method according to claim 2, wherein the seedlings on the plate after irrigation are dispersed in the paddy field within 24 hours of watering after the granules according to claim 1 are scattered.