JP2003113011A - Method for controlling bacterial disease of rice seedling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for controlling bacterial diseases of rice seedlings (specifically, Acidovorax avenae, Burkholderia plantarii and Burkholderia glumae due to Pseudomonas glumae Kurita et Tabei of rice plants) that are important disease injuries in the period of raising seedlings in cultivation of paddy rice by which stable effects of a fungicide comprising a copper salt as an active ingredient are obtained even under frequently occurring conditions. SOLUTION: This method for controlling comprises treating rice seeds with the fungicide comprising the copper salt as an active ingredient and treating a nursery bed for raising the seedlings with (1RS,3SR)-2,2-dichloro-N-[1-(4- chlorophenyl-)ethyl]-1-ethyl-3-methylcyclopropanecarboxylamide (compound B).

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for controlling bacterial disease of rice seedling, which is an important disease in rice seedling cultivation.

[0002]

2. Description of the Related Art In the cultivation of paddy rice, it is very important to control bacterial diseases of seedlings that occur during the seedling raising period. A fungicide containing copper salt as an active ingredient is widely used for rice seedlings such as brown streak, seedling rot caused by bacterial wilt disease, and bacterial wilt disease. However, the efficacy of a fungicide containing a copper salt as an active ingredient varies greatly depending on the cultivation environment of rice seedlings, and it is known that the effect is not sufficient in some cases (Kanto Higashiyama Disease and Pest Annual Report 45-1998). 19-21). On the other hand, (1R
S, 3SR) -2,2-Dichloro-N- [1- (4-chlorophenyl-) ethyl] -1-ethyl-3-methylcyclopulpancarboxamide is a bactericidal compound known by the generic name Carpropamide. However, no control effect was observed for bacterial disease of rice seedlings during the rice seedling raising period.

[0003]

Means for Solving the Problems Under the circumstances, the present inventor diligently studied a method for controlling a bacterial disease of rice seedlings, which is an important disease. ) Is processed and (1RS, 3SR) -2,
Stable control of rice seedling bacterial disease by treating seedlings grown with 2-dichloro-N- [1- (4-chlorophenyl-) ethyl] -1-ethyl-3-methylcyclopulpancarboxamide It has been found that the above is possible, and the present invention has been completed.

[0004]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the bacterial disease of rice seedlings is a bacterial disease of rice seed infectious disease, and the bacterial stripe disease (Ac
idovorax avenae), bacterial wilt disease (Burkholderia plan)
tarii), seedling rot (Burkholderi)
a glumae). INDUSTRIAL APPLICABILITY The method of the present invention is highly effective against bacterial wilt disease or bacterial wilt disease, and particularly effective in bacterial wilt disease.

In the bactericide containing a copper salt as an active ingredient in the present invention (hereinafter referred to as the present seed treatment agent), examples of the copper salt include cupric hydroxide and basic copper chloride.
Copper is preferred. As the seed treatment agent, it is possible to use ipconazole / copper wettable powder such as commercially available and copper nonylphenol sulfonate, etc., as long as it contains a copper salt as an active ingredient, other bactericidal effect Ingredients, carriers, auxiliaries for preparations, etc. may be contained as other ingredients. The seed treatment agent, emulsion, wettable powder, powder,
Various formulation forms such as granules can be adopted, but the copper salt in the formulation is usually 0.1 to 50% by weight. As the carrier used in such formulation, kaolin clay, attapulgite clay, bentonite, montmorillonite, acid clay, pyrophyllite, talc, diatomaceous earth,
Fine powder or granules of minerals such as calcite, natural organic substances such as corn cob powder, walnut shell powder, synthetic organic substances such as urea, salts such as calcium carbonate and ammonium sulfate, synthetic inorganic substances such as synthetic hydrous silicon oxide, etc. Solid carriers, aromatic hydrocarbons such as xylene, alkylbenzene and methylnaphthalene, alcohols such as isopropanol, ethylene glycol, propylene glycol and cellosolve, ketones such as acetone, cyclohexanone and isophorone, vegetable oils such as soybean oil and cottonseed oil. , Liquid carriers such as petroleum-based aliphatic hydrocarbons, esters, dimethylsulfoxide, and acetonitrile. As a method for treating rice seed (hull) with the present seed treating agent, a method of dressing rice seed with the present seed treating agent which is a powder; the present seed treating agent which is an emulsion, a wettable powder or a water suspension agent Examples thereof include a method of diluting with water and spraying the resulting diluted solution onto seeds; or a method of immersing rice seeds in the present seed treatment agent or a diluted solution thereof. The use amount of the present seed treatment agent may vary depending on the method of treatment, but in the case of dressing treatment or spraying treatment on seeds, the present seed treatment agent is usually 0. 02 to 1 g, preferably 0.05 to
It is 0.5 g. In the case of the dipping treatment, the dipping liquid has a converted concentration as copper of usually 0.002 to 0.2% by weight, preferably 0.005 to 0.05% by weight. The immersion time in the immersion treatment varies depending on the concentration of copper in the immersion liquid, but is usually in the range of 10 minutes to 24 hours.

Rice seeds treated with this seed disinfectant are
Usually, soaking and germination treatment are carried out according to a conventional method. afterwards,
The rice seeds are sown on a nursery and raised. The nursery is usually a nursery box with bed soil laid. Here, the bed soil means a soil or a soil substitute medium used in the rice seedling raising period. Specifically, the soil includes commercially available granular soil for raising rice seedlings, upland soil used by farmers at home, paddy soil, and mountain soil, and the soil substitute medium includes mats for raising seedlings and rock wool medium. . For the nursery, (1RS, 3SR) -2,2-dichloro-N
-[1- (4-chlorophenyl-) ethyl] -1-ethyl-3-methylcyclopulpancarboxamide (hereinafter,
It is referred to as Compound B. ) Is processed. As the processing time,
Before and after sowing of rice seeds is preferable. As a processing method,
Specifically, it is performed by the following method. 1) Before packing the bed soil in a nursery box, a powder of Compound B; granules are mixed in advance with the bed soil. 2) After the bed soil is packed in a nursery box, the granules of the compound B are dispersed on the surface of the bed soil before seeding of rice seeds or before and after covering with soil. 3) After the bed soil was packed in a nursery box, a wettable powder of Compound B, a wettable granule or a water suspension was diluted with water to a predetermined concentration before or after sowing of rice seeds or before and after covering with soil. The diluted solution is sprayed or irrigated on the soil surface.

The compound B may be used as it is without adding any other components, but usually, the above-mentioned powders, granules,
It is used in the form of preparations such as wettable powders, wettable powders, and water suspensions. The compound B in the formulation is usually 0.1% by weight.
50%. In the method of the present invention, compound B is preferably granulated as a granule on the seedbed. In the case of a nursery box having an area of 1,800 cm ² , the treatment amount of the compound B is usually 0.2 to 10 g per box, preferably 0.5.
~ 4g is used.

The seedbed treated with the compound B is usually transferred to a germinator or a greenhouse to germinate rice seeds, and then seedlings are grown according to a conventional method until the time of rice planting.

[0009]

EXAMPLES The present invention will be described in more detail below with reference to formulation examples and test examples, but the present invention is not limited to the following examples. In addition, a part represents a weight part. Formulation Example 1 (the present seed treatment agent) 4.6 parts of cupric hydroxide, 5 parts of ipconazole, 3 parts of calcium lignin sulfonate, sodium lauryl sulfate 2
Parts and 85.4 parts of synthetic hydrous silicon oxide are well pulverized and mixed to obtain a wettable powder containing a copper salt as an active ingredient.

Formulation Example 2 (Granule containing Compound B) (1RS, 3SR) -2,2-dichloro-N- [1-
(4-Chlorophenyl-) ethyl] -1-ethyl-3-
Methylcyclopurpancarboxamide (4 parts), dioctylsulfosuccinate sodium salt (2 parts), synthetic hydrous silicon oxide (1 part), bentonite (30 parts), and kaolin clay (63 parts) were pulverized and mixed, and water was added to the mixture, followed by granulation and drying. To obtain 4% granules of compound B.

Test Example 1 Rice seeds (hereinafter, referred to as contaminated paddy) artificially infected with rice seedling wilting bacteria were prepared. Commercially available Techreed C Flowable (made by Kumiai Chemical; type name "Ipconazole / copper wettable powder; flowable agent containing 5% ipconazole and 4.6% cupric hydroxide") is diluted with water to a predetermined concentration. A liquid was prepared. 2 g of 10 g of the above contaminated paddy
0 ml of the diluted solution was soaked at room temperature for 24 hours.
Then, after air-drying for 1 day, the paddy was soaked (18 ° C. for 3 days) and germinated (30 ° C. for 1 day) according to a usual rice cultivation method. Diameter 10c of commercially available granular soil for rice seedling raising
m plastic pot. The above-mentioned germinated paddy that has been subjected to seed treatment is sown on the soil, and a commercially available Win box granule (manufactured by Japan Bayer Agrochem: type name "carpropamide granule"; compound B4%) is applied to the soil and seeds before covering with soil.
Granules containing a certain amount of) were uniformly dispersed. Then, the soil was covered with the above-mentioned granular soil for raising rice seedlings, and a sufficient amount of water was applied. The rice seeding amount at this time is equivalent to 150 g per standard seedling raising box (30 × 60 × 3 cm), and the granule treatment amount is equivalent to 50 g per standard seedling raising box.
After sowing, a germination treatment (30 ° C. for 3 days) was performed in a germination device, and then cultivation was performed in a greenhouse for 14 days. After that, regarding the seedling wilt disease, the rate of non-diseased seedlings {non-diseased seedling rate (%) = number of healthy seedlings / (number of diseased seedlings + number of healthy seedlings) × 100} was investigated. still,
Each treatment was carried out in 3 replicates, and the result was the average of 3 replicates. The results are shown in Table 1.

[0012]

[Table 1]

[0013]

EFFECTS OF THE INVENTION Rice seeds (rice) are treated with a fungicide containing a copper salt as an active ingredient, and (1RS, 3SR) -2,2-dichloro-N- [1- (4-chlorophenyl-) ethyl]. −
Treatment of seedbeds with 1-ethyl-3-methylcyclopulpancarboxamide enhances the effect of copper salts on rice seedling bacterial disease.

Claims (4)

[Claims] 1. A method for controlling bacterial diseases of rice seedlings, which comprises treating rice seeds with a fungicide containing a copper salt as an active ingredient,
(1RS, 3SR) -2,2-dichloro-N- [1-
(4-Chlorophenyl-) ethyl] -1-ethyl-3-
A method for controlling pests, which comprises treating a nursery bed with methylcyclopulpancarboxamide. 2. The control method according to claim 1, wherein the bacterial disease of rice seedlings is bacterial blight of bacterial blight or bacterial disease of bacterial blight of seedlings. 3. A bactericide containing a copper salt as an active ingredient is 2-
[(4-Chlorophenyl) methyl] -5- (1-methylethyl) -1- (1H-1,2,4-triazole-1
The control method according to claim 1 or 2, further comprising -ylmethyl) cyclopentanol. 4. (1RS, 3SR) -2,2-dichloro-
Treatment of the nursery with N- [1- (4-chlorophenyl-) ethyl] -1-ethyl-3-methylcyclopulpancarboxamide resulted in (1RS, 3SR) -2,2-dichloro-N- [1- (4 -Chlorophenyl-) ethyl] -1-
The control method according to any one of claims 1 to 3, wherein the granules containing ethyl-3-methylcyclopulpancarboxamide are granulated to a seedbed after seeding with rice and before covering with soil.