JPH07206608A - Neck rot-controlling agent and controlling method using the same - Google Patents

Abstract

PURPOSE:To obtain a neck rot-containing agent capable of highly effectively controlling neck rot by rice raising seedling box treatment. CONSTITUTION:This neck rot-controlling agent for rice raising seedling box treatment consists of granules containing, as an antibacterial ability-imparting active ingredient, 1-20wt.% of N-[1-(2,4-dichlorophenyl)ethyl]-2-cyano-3,3- dimetylbutanamide. These granules are applied at 1-20g, in terms of the active ingredient, per 1800cm<2> to rice raising seedling box(es) to accomplish controlling neck rot. These granules, which are normally applied directly to the soil surface of rice raising seedling box(es), may also be subjected to soil admixing treatment. The rice seedlings in their raising box(es) after treated are irrigated and then transplanted to paddy field(s) within 24hr; thereby controlling neck rot effectively.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a rice blast control agent and a method for controlling rice blast using the same.

2. Description of the Related Art In recent years, cultivation of seedlings using a nursery box has become common in rice cultivation to improve work efficiency, and rice is the most important disease of rice. An effective control method for rice blast by treating rice seedling boxes is desired. Conventionally, tricyclazole (5-methyl-1,2,4-triazolo [3,3
4-b] Benzothiazole: Hereinafter referred to as compound (A). ) And probenazole (3-allyloxy-1,2-
Benzthiazole 1,1 dioxide: Hereinafter referred to as compound (B). ), Etc., are known as active ingredients of fungicides against rice blast that can be used by treating rice seedling raising boxes, but these compounds are also effective as rice seedling raising box treatment agents in terms of their bactericidal effect and the like. It's not always enough.

[0002]

The present inventors have
In view of the above situation, rice blast disease is caused by rice seedling box treatment.
Diligently study to develop a method that can effectively control
As a result, N- [1-
(2,4-Dichlorophenyl) ethyl] -2-cyano-
3,3-dimethylbutanamide (hereinafter referred to as compound (I)
Write down. ) 1 to 20% by weight of granules to be used
The rice blast disease is extremely effective by treating rice seedling boxes
In particular, the granules can be placed in a rice seedling raising box.
800 cm ²1 to 20 g of active ingredient per treatment
With, you can control rice blast efficiently.
As a result, they have completed the present invention. I.e. the book
The invention relates to 1-20% by weight of N- [1- (2,4-dichloro).
Rophenyl) ethyl] -2-cyano-3,3-dimethyl
Granules containing butanamide as an active ingredient for imparting antibacterial properties
Rice blast for treating rice seedling raising boxes
1800 cm of the control agent and the granules in a rice seedling box²
It is characterized by treating 1 to 20 g of the effective ingredient per unit
The present invention provides a method for controlling rice blast disease.

According to the present invention, it is possible to control rice blast for a long period of time without being significantly affected by the type of soil used and water leakage in paddy fields. Further, even if the compound (I) is used in a relatively high concentration, there is no phytotoxicity which is a problem for rice and subsequent crops. In the present invention, the compound (I) which is an active ingredient imparting antibacterial property can be produced according to the description in JP-A-2-76846. In the granules according to the present invention, for example, compound (I) as an active ingredient is mixed with a solid carrier, or if necessary, further mixed with a surfactant, a dispersant, a sticking agent, a stabilizer or a mixture thereof. Then, water can be added, and the mixture can be kneaded well and then granulated and dried. Examples of the solid carrier include clays (for example, kaolin clay, diatomaceous earth, synthetic hydrous silicon oxide, fubasami clay, bentonite, acid clay) and other inorganic minerals (for example, sericite, quartz powder, sulfur powder, activated carbon, calcium carbonate, Hydrated silica), chemical fertilizers (eg ammonium sulfate, ammonium phosphate, ammonium nitrate, urea,
Examples include fine powders or granular materials such as salty ammonium). Examples of the surfactant include alkyl sulfates, alkyl sulfonates, alkyl aryl sulfonates, sulfosuccinic acid diester salts, alkyl aryl ethers and polyoxyethylenated products thereof, polyethylene glycol ethers, polyhydric alcohol esters, Examples include sugar alcohol derivatives. Examples of dispersants and fixing agents include casein, gelatin, polysaccharides (eg starch, arabic gum, cellulose derivatives, alginic acid),
Examples thereof include lignin derivatives, bentonite, saccharides, synthetic water-soluble polymers (for example, polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acids) and the like, and examples of stabilizers include PAP (isopropyl acid phosphate) and BHT.
(2,6-di-tert-butyl-4-methylphenol), BHA (mixture of 2-tert-butyl-4-methoxyphenol and 3-tert-butyl-4-methoxyphenol), vegetable oil, mineral oil, Examples thereof include surfactants, fatty acids or their esters. In the granule according to the present invention, the content of the solid carrier is usually 60 to 99% by weight.
When a surfactant, a dispersant, a fixing agent, and a stabilizer are used, their contents are usually 1 to 20% by weight, respectively, and their total amount is usually 1 to 20% by weight.

The granules according to the present invention are usually used by being sprayed (granulated) on the soil surface of a rice seedling raising box as they are, but they can also be mixed with the soil. Further, they can be mixed with insecticides, nematicides, fertilizers, soil conditioners and the like and used at the same time. Some examples of active ingredients of insecticides that can be mixed are listed below with the compound symbol. Compound (C): 5-amino-1- [2,6-dichloro-
4- (trifluoromethyl) phenyl] -4- (trifluoromethyl) sulfinyl-1H-pyrazole-3-
Carbonitrile [generic name fipronil] Compound (D): 1- (6-chloro-3-pyridylmethyl) -N-nitroimidazolidine-2-ylideneamine [generic name imidacloprid] Compound (E): Ethyl N- [2,3- Dihydro-2,
2-Dimethylbenzofuran-7-yloxycarbonyl (methyl) aminothio] -N-isopropyl-β-alaninate [generic name benfuracarb] Compound (F): S, S '-(2-Dimethylaminotrimethylene) bis (thiocarbamate) ) [General name cartap] Compound (G): 4- (methylthio) phenyl dipropyl phosphate [General name propaphos] Compound (H): 2,3-dihydro-2,2-dimethylbenzofuran-7-yl (dibutylaminothio) Methyl carbamate [generic name carbosulfan] Compound (J): N- (6-chloro-3-pyridylmethyl) -N-ethyl-N'-methyl-2-nitrovinylidene diamine [generic name nitenpyram] Compound (K): 4 , 5-dihydro-6-methyl-4-
(3-Pyridylmethyleneamino) -1,2,4-triazin-3 (2H) -one [generic name pymetrozine] When compound (I) and the active ingredient of the above insecticide are mixed and used, the mixing ratio is The weight ratio is usually 0.01 to 100,
It is preferably 0.2 to 20. The processing amount of the granules according to the present invention is the size of a nursery box (30 cm × 6
0 cm × 3 cm), that is, a ratio of 1 to 20 g as the amount of active ingredient per 1800 cm ² . The granules according to the present invention are usually granulated in a rice seedling raising box, then irrigated, and after watering, the rice seedlings are transplanted to a paddy field. In the present invention, the granules are usually granulated. By transplanting the rice seedlings in the rice seedling raising box to the paddy field within 24 hours after watering, the rice blast disease can be effectively controlled.

[0005]

EXAMPLES The present invention will be described in more detail below by showing formulation examples and test examples, but the present invention is not limited to these examples. The% showing the amount of the active ingredient in the preparation is% by weight unless otherwise specified. Formulation Example 1 1 part of compound (I), 1 part of synthetic hydrous silicon oxide, 2 parts of calcium lignin sulfonate, 30 parts of bentonite and 66 parts of kaolin clay are crushed and mixed, and water is added and kneaded well, and then granulated and dried. To obtain 1% granules. Formulation Example 2 2.5 parts of compound (I), 2 parts of dioctylsulfosuccinate sodium salt, 1 part of synthetic hydrous silicon oxide, 30 parts of bentonite, and 64.5 parts of kaolin clay were pulverized and mixed, and water was added and kneaded well. After that, granulate and dry, 2.5%
Get granules. Formulation Example 3 Compound (I) 5 parts, dioctyl sulfosuccinate sodium salt 2 parts, synthetic hydrous silicon oxide 1 part, bentonite 3
0 part and 62 parts of kaolin clay are pulverized and mixed, water is added and the mixture is well kneaded and then granulated and dried to obtain 5% granules. Formulation Example 4 10 parts of compound (I), 2 parts of dioctyl sulfosuccinate sodium salt, 2 parts of synthetic hydrous silicon oxide, 30 parts of bentonite, 56 parts of kaolin clay are pulverized and mixed, and water is added and kneaded well, followed by granulation. Dry to obtain 10% granules. Formulation Example 5 5 parts of compound (I), 5 parts of each of compounds (C) to (K),
1 part of synthetic hydrous silicon oxide, 2 parts of calcium lignin sulfonate, 30 parts of bentonite and 57 parts of kaolin clay are pulverized and mixed, water is added and kneaded well, and then granulated and dried to obtain 5% granules of each. . Compounds (A) to (K)
Each of the above can be formulated, for example, according to the above formulation examples. Comparative Preparation Example 1 5 parts of compound (I), 14 parts of polyoxyethylene styryl phenyl ether, 6 parts of calcium dodecylbenzene sulfonate and 75 parts of xylene were mixed well and 5% was obtained.
Obtain an emulsion. Comparative Formulation Example 2 10 parts of compound (I), 14 parts of polyoxyethylene styryl phenyl ether, 6 parts of calcium dodecylbenzene sulfonate and 70 parts of xylene were mixed well to give 1
A 0% emulsion is obtained.

Next, it will be shown in Test Examples that the present invention can control rice blast very effectively. Test Example 1 Wagner Pot Test A rice seedling raising box (30 cm × 60 cm × 3 cm) was filled with artificial soil (Bonsol No. 2: Koura Sangyo Co., Ltd.), and about 200 g of dry rice (Nihonbare) was sown per box. . 20 days after sowing, the granules prepared according to Formulation Example 3 or 4 or the emulsions prepared according to Comparative Formulation Example 1 or 2 were uniformly sprayed on the soil surface of the nursery box. Then, after lightly watering, 5 rice seedlings were transplanted to a 1/5000 are Wagner pot filled with sandy loam soil (produced in Takarazuka City, Hyogo Prefecture). 3 cm per day from the bottom of the Wagner pot
Cultivation was continued in the greenhouse while water leakage treatment was continued at the ratio of. Four weeks after the transplantation, the rice blast was put in a greenhouse together with another rice seedling having blast disease and kept in a humid condition to be infected with the blast fungus. Eleven days after the inoculation of the bacteria, the disease index of leaf blast was investigated according to the following criteria, and the control value was calculated from the equations 1 and 2. The disease severity in the untreated plot was 68%. Disease index Lesion area ratio 0 0 1 1-5% 26-6 25% 4 26-50% 8 51% or more

[Equation 1] N: Number of surveyed leaves n1 to n4: Number of leaves of disease index 1, 2, 4, 8 respectively

[Equation 2] The results are shown in Table 1.

[Table 1]

Test Example 2 Wagner Pot Test A rice seedling raising box (30 cm × 60 cm × 3 cm) is filled with artificial soil (Bonsol No. 2: manufactured by Koura Sangyo Co., Ltd.) or sandy loam soil (produced by Takarazuka City, Hyogo Prefecture), and 1 Rice per box (Nippon Hare)
Approximately 200 g of the dry rice cake was sown. 20 days after sowing, the granules prepared according to Preparation Example 2 were uniformly sprayed on the soil surface of the nursery box. Then, after lightly irrigating, 5 rice seedlings were
Loam soil (from Oyama-cho, Saihaku-gun, Tottori prefecture) or sandy loam soil (from Takarazuka-shi, Hyogo prefecture) was transplanted into a 1/5000 ares Wagner pot filled with water. Cultivation was continued in the greenhouse while continuing water leakage treatment from the bottom of the Wagner pot at a rate of 3 cm per day. Three or six weeks after the transplantation, the blast fungus was infected according to Test Example 1, and 11 days after the inoculation, the disease index of leaf blast was investigated according to Test Example 1 to determine the control value. The results are shown in Table 2. The disease rate (%) in the non-treated area was 98% in both cases of 3 weeks and 6 weeks from the transplantation to the inoculation of the bacteria when the loam was used after transplanting the artificial soil in the seedling raising period. When sandy loam was used during the seedling raising period and after transplantation, the period from transplantation to bacterial inoculation was 3 weeks and 91% in both cases of 6 weeks.

[Table 2] *: Period from transplantation to inoculation (week)

Test Example 3 Field Test A rice seedling raising box (30 cm × 60 cm × 3 cm) was filled with artificial soil (Bonsol No. 2: Koura Sangyo Co., Ltd.), and about 200 g of dry rice (Nihonbare) per box was packed. Sowed. 20 days after sowing, the granules prepared according to Preparation Examples 2 to 4 were uniformly sprayed on the soil surface of the nursery box. Then, after lightly watering, rice seedlings were mechanically transplanted to a paddy field (paddy field in Kasai city, Hyogo prefecture: light clay) at a ratio of 2 nursery boxes / 1 areal according to a conventional method. Twelve and twenty-one days after transplantation, another rice seedling with blast disease was transplanted around the test area and used as an infection source. 41 days after transplantation, the disease index of leaf blast was investigated for 50 strains per ward according to the following criteria, and the control value was determined according to the number 1 and the number 2 of Test Example 1. The disease severity in the untreated plot was 70%. Disease index Degree of disease 0 Number of lesions per strain 0 0.5 Number of lesions per strain 1 to 5 Number of lesions per strain 6 to 10 Number of lesions per strain 11 to 20 4 Lesions per strain Table 3 shows the results of 50 or more lesions per number 21 to 50 8 strains.

[Table 3]

Test Example 4 Wagner Pot Test A rice seedling raising box (30 cm × 60 cm × 3 cm) is filled with artificial soil (Bonsol No. 2: Koura Sangyo Co., Ltd.), and about 200 g of rice (Nihonbare) dry rice Seeded. 20 days after sowing, the granules prepared according to Preparation Example 5 were uniformly sprayed on the soil surface of the nursery box. After light irrigation,
Five rice seedlings were transplanted into a 1/5000 ares Wagner pot filled with sandy loam soil (produced in Takarazuka City, Hyogo Prefecture). Cultivation was continued in the greenhouse while continuing water leakage treatment from the bottom of the Wagner pot at a rate of 3 cm per day. Transplant 4
After a week, they were placed in a greenhouse together with another rice seedling that had blast disease and kept in a humid condition to infect the blast fungus. 11 days after the inoculation of the bacteria, the disease index of rice cake was investigated in accordance with Test Example 1 to determine the control value. The disease severity in the untreated plot was 62%. The results are shown in Table 4.

[Table 4]

[0010]

INDUSTRIAL APPLICABILITY The present invention can control rice blast very effectively.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsuguhiro Kato 4-2-1 Takashi, Takarazuka-shi, Hyogo Sumitomo Chemical Co., Ltd.

Claims (4)

[Claims] 1. A granule containing 1 to 20% by weight of N- [1- (2,4-dichlorophenyl) ethyl] -2-cyano-3,3-dimethylbutanamide as an antibacterial property-providing active ingredient. A rice blast control agent for treating rice seedling raising boxes, which is characterized in that 2. A rice seedling box containing 180 parts of the granules according to claim 1.
A method for controlling rice blast, which comprises treating 1 to 20 g of the active ingredient per 0 cm ² . 3. The method of controlling a pest according to claim 2, which comprises performing a granulation process. 4. The control method according to claim 2, wherein the rice seedlings in the rice seedling raising box to which the granules according to claim 1 have been dispersed are transplanted into a paddy field within 24 hours after watering.