JP2000095614A - Composition for controlling disease damage of paddy-rice plant and control using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition capable of exhibiting an outstanding effect on stem rot in rice farming and, having a sufficiently controlling effect on disease damage of paddy-rice plant for the whole rice farming period by a row lateral application in a paddy field by making the composition include a specific compound and a fertilizer. SOLUTION: This composition comprises (A) 2',6'-dibromo-2-methyl-4'- trifluoromethoxy-4-trifluoromethyl-1,3-thiazole-5-carboxyanilide of the formula and (B) a fertilizer (e.g. nitrogenous fertilizer such as urea, ammonium nitrate, etc., phosphatic fertilizer such as calcium superphosphate, double superphosphate, etc.). Preferably the content of the component A is 25-0.0001 wt.% calculated as the amount of an active ingredient. The composition is obtained, for example, by feeding 50-99.9 pts.wt. of granular or massive fertilizer into a blender free from a grinding element, spraying an aqueous solution containing 0.1-5 pts.wt. of a tacky agent in a blending operation process to uniformly distribute the tacky agent to the surface of the fertilizer and blending the mixture with a material containing 1-50 wt.% of the compound of the formula formulated into a powdery state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a composition for controlling rice plant diseases and a method for controlling rice plant diseases using the same.

[0002]

2. Description of the Related Art Among rice diseases, important diseases to be controlled include diseases that form sclerotium such as sheath blight, brown sclerotia, red sclerotium and brown sheath rot (hereinafter referred to as "sclerotium disease"). "). In sclerotium disease, hyphae germinated from the sclerotium of the pathogenic bacterium invade the lower leaf sheath and gradually migrate to the upper leaf sheath, causing a disease. The disease caused by sclerotium starts in late July and progresses rapidly from mid-August to early September. In early cultivation and early planting cultivation, since late July to early September corresponds to the heading stage to the ripening stage of rice, the disease may reach the flag leaf sheath and ears.
It can cause a 30% decrease in revenue. As a conventional method for controlling sclerotium, a powder for controlling sclerotium is sprayed on foliage several times or a granule is applied on the surface several times from the early stage to the late stage of the disease.

[0003]

However, the timing of the occurrence of such diseases is difficult to predict, and many times of chemical treatments for their control are heavy labors and heavy burdens for farmers. In addition, since sclerotium disease occurs and spreads in the midsummer, the chemical treatment at that time is extremely severe, and the spread of the disease is rapid. It is difficult to carry out the obtained treatment, and the control effect of the conventional method is not sufficient.

[0004]

Under such circumstances, the present inventors have conducted intensive studies and as a result, have the following formula:

Embedded image (Hereinafter referred to as compound A) and a fertilizer are effective against sclerotium disease which is a problem in rice cultivation. By applying lateral stripes to paddy fields at the time of sowing, the disease caused by sclerotium can be efficiently controlled throughout the rice cultivation period,
The present inventors have found that a large labor saving can be achieved in controlling rice disease, and that a more reliable control effect can be obtained, leading to the present invention. That is, the present invention provides a composition for controlling rice disease comprising Compound A and a fertilizer (hereinafter, referred to as the present composition). The present invention also provides a method for controlling rice plant diseases by applying the present composition to a paddy field at the time of transplanting seedlings or seeding of paddy (hereinafter referred to as the present method).

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The fertilizer contained in the composition of the present invention is a fertilizer component such as nitrogen, phosphorus, potassium, silicon,
It contains various elements required by paddy rice such as magnesium, calcium, manganese, boron, and iron. Specific examples include urea, ammonium nitrate, ammonium nitrate, ammonium chloride, ammonium sulfate, ammonium phosphate, and sodium nitrate. , Calcium nitrate, potassium nitrate, lime nitrogen, formaldehyde processed urea fertilizer (U
F), nitrogenaceous fertilizers such as acetaldehyde-processed urea fertilizer (CDU), isobutyraldehyde-processed urea fertilizer (IBDU) and guanyl urea (GU), lime superphosphate, lime heavy superphosphate, fused phosphorus fertilizer, and humic acid phosphorus Manure, calcined phosphorus manure, heavy burnt phosphorus, magnesia perphosphate, ammonium polyphosphate, potassium metaphosphate, calcium metaphosphate, magnesia phosphate,
Phosphate fertilizers such as phosphorous ammonium sulfate, potassium phosphate nitrate and phosphorous ammonium salt, potassium fertilizers such as potassium chloride, potassium sulfate, potassium sulfate, potassium sulfate, potassium bicarbonate, potassium phosphate, etc., and silicic acid such as calcium silicate Fertilizer, magnesium fertilizer such as magnesium sulfate and magnesium chloride,
Control of calcium fertilizers such as quicklime, slaked lime and calcium carbonate, manganese fertilizers such as manganese sulfate, magnesium manganese sulfate, and manganese mine, boronaceous fertilizers such as boric acid and borate, and iron-containing fertilizers such as steel slag Common fertilizers (including compound fertilizers) specified by law can be mentioned.
Among them, those containing at least one fertilizer component selected from nitrogen (N), phosphorus (P) and potassium (K), particularly those containing all three fertilizer components, are preferred. Specific examples, NPK-component _{(N-P 2 O 5 -K} 2 O) include fertilizers, as such a fertilizer, for example, type 1 flat up such 5-5-7,12-12-16 Type, 5-5-5, 14-14-14, etc. 2 type horizontal type, 6-6
-5, 8-8-5, etc. 3 type flat type, 4-7-9, 6-8-11 etc., 4 type up type, 4-7-7, 10-20-20 etc., 5 type up type Flat type, 4-7-4, 6-
6-type mountain type such as 9-6, 7-type valley type such as 6-4-5, 14-10-13, 6-5-
8 type flat type such as 5, 18-11-11, 9 type down type such as 7-6-5, 14-12-9, 10 type NP type such as 3-20-0, 18-35-0 , 16-
Examples thereof include 11-type NK type such as 0-12 and 18-0-16, and 12-type PK type such as 0-3-14 and 0-15-15. The form of the fertilizer to be used may be any of a granular form, a powdery form, a massive form, a liquid form and the like, and various forms of fertilizer can be used. Further, the composition of the present invention can also be produced by using a fertilizer to which sustained release is imparted as a raw material. Here, as a method for imparting sustained release properties, for example, a method of adding phosphoric acid in the form of calcium phosphate, adding pitch, sulfur, resin, or the like, or a coating material (for example, resin such as polyolefin)
Is dissolved or dispersed in a solvent (e.g., toluene), and the solution or dispersion is coated on the surface of the fertilizer component, and the solvent is removed by drying to obtain a coated fertilizer, or uncured as a coating material. Using a certain thermosetting resin (for example, epoxy resin or urethane resin),
After adding to the granular fertilizer in the rolling state, coating the surface of each fertilizer particle with the uncured thermosetting resin, and then thermosetting the uncured thermosetting resin to form a coated fertilizer. it can. The weight ratio of the coating material to the coated fertilizer, that is, the coating ratio is, for example, in a range of about 2 to 30% by weight. The composition of the present invention, in addition to compound A and fertilizer,
It may contain suitable auxiliary components. As the auxiliary component,
For example, by adding an auxiliary agent such as a water-insoluble inorganic substance such as talc, pyroxene, and silica, it is possible to prevent caking at the time of producing the composition of the present invention.

Compound A (chemical name: 2 ', 6'-dibromo-2-methyl-4'-trifluoromethoxy-4-trifluoromethyl-1,3-thiazole-5-carboxanilide) is, for example, It can be manufactured according to the manufacturing method described in JP-A-2-184680.

The compound A can be used as it is in the preparation of the composition of the present invention without adding any other components. Also, it is mixed with various carriers such as a solid carrier and a liquid carrier, and if necessary, further added with a surfactant and other auxiliaries for formulation, if necessary, to prepare emulsions, wettable powders, suspensions in water, emulsions in water. The composition of the present invention can also be used in the preparation of the composition of the present invention after being formulated into an agent, granule, powder or the like. These preparations usually contain the compound as an active ingredient in an amount of 0.001% to 95% by weight.

[0008] Examples of the solid carrier used in such a formulation include clays (kaolin clay, bentonite, fubasami clay, acid clay, etc.), talc, diatomaceous earth, synthetic hydrous silicon oxide, ceramics, and other inorganic minerals (cellulose). Fine powders or granular materials such as cite, quartz, sulfur, activated carbon, hydrated silica, etc .; and liquid carriers such as water, alcohols (methanol, ethanol, etc.), ketones (acetone, methyl ethyl ketone, etc.). ,
Aromatic hydrocarbons (benzene, toluene, xylene, ethylbenzene, methylnaphthalene, etc.), aliphatic hydrocarbons (hexane, cyclohexane, kerosene, light oil, etc.), esters (ethyl acetate, butyl acetate, etc.), nitriles (acetonitrile) , Isobutyronitrile, etc.), ethers (diisopropyl ether, dioxane, etc.), acid amides (N, N-dimethylformamide, N, N-dimethylacetamide, etc.), halogenated hydrocarbons (dichloromethane, trichloroethane, tetrachloride) Carbon), dimethyl sulfoxide, vegetable oils such as soybean oil and cottonseed oil.

Examples of the surfactant include anionic surfactants such as alkyl sulfates, alkyl sulfonates and alkylaryl sulfonates, alkylaryl alcohols and polyoxyalkylene-added compounds thereof, alkyl alcohols and their salts. Nonionic surfactants such as polyoxyalkylene addition compounds, polyhydric alcohols and esters thereof, and saccharides can be mentioned.

[0010] Auxiliaries for preparations such as fixing agents and dispersants include, for example, casein, gelatin, polysaccharides (starch, gum arabic, cellulose derivatives, alginic acid, etc.), lignin derivatives, bentonite, sugars, synthetic water-soluble polymers ( Polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylic acids, etc.), and examples of the stabilizer include PAP (acidic isopropyl phosphate), BHT (2, 6
-Di-tert-butyl-4-methylphenol), BHA
(2-tert-butyl-4-methoxyphenol and 3-te
a mixture with rt-butyl-4-methoxyphenol), vegetable oils, mineral oils, surfactants, fatty acids or esters thereof, and the like.

Formulations of flowables (suspension in water or emulsions in water) generally contain 1 to 75% of compound A in an amount of 0.5 to 1%.
5% of the above surfactants and dispersants, 0.1-10%
(Eg, a protective colloid or a compound that imparts thixotropic properties), 0 to 10% of a suitable auxiliary (eg, an antifoaming agent, a rust inhibitor, a stabilizer, a spreading agent, a penetration aid) , An antifreezing agent, a fungicide, a fungicide, etc.). It is also possible to use an oil in which compound A hardly dissolves in place of water to make a suspension in oil. As protective colloids, for example, gelatin,
Casein, gums, cellulose ether, polyvinyl alcohol and the like are used. Examples of the compound imparting thixotropic properties include inorganic fine powders such as synthetic hydrous silicon oxide, bentonite, and aluminum magnesium silicate, and water-soluble polymers such as xanthan gum, sodium carboxymethyl cellulose, and polyacrylic acid.

The composition of the present invention containing the above fertilizer and Compound A can be produced, for example, by the following method. 1. Granular or bulk fertilizer (about 50-99.9 parts by weight)
Is put into a mixer having no crushing element such as a planetary mixer, and an aqueous solution containing an adhesive (about 0.1 to 5 parts by weight) such as polyvinyl alcohol or polyvinyl acetate is sprayed during the mixing operation. After uniformly dispersing a solution of an adhesive such as polyvinyl alcohol or polyvinyl acetate on the surface of the fertilizer, the compound A prepared in a powder form in the mixer is used.
(Containing about 1 to 50% by weight of the active ingredient) and about 10%
After about 30 minutes, while operating the mixer, about 50 minutes
To 150 ° C. to obtain a granular or massive composition of the present invention. 2. Compound A (approximately 0.0
1-20% by weight of the active ingredient) is coated or impregnated with granular or bulk fertilizer using a fluid coating apparatus or a mixer having no crushing element, and then air-dried or about 50-150 ° C. By heating and drying in
The composition of the present invention is obtained. 3. Compound A or its wettable powder or powder (about 0.01
-5% by weight of the active ingredient) and a powdered fertilizer, and then granulating using a granulator such as a dish granulator to obtain the composition of the present invention. 4. Compound A formulated in suspension in water or emulsion in water
(Containing about 1 to 75% by weight of the active ingredient) and a liquid fertilizer are placed in a mixing tank equipped with a stirrer and mixed so as to obtain a composition of the present invention. When the composition of the present invention is in the form of granules or aggregates, the particle size is about 1 to 1 from the viewpoint of handling.
A range of 10 mm is preferred. In the composition of the present invention, the fertilizer content is usually 99.999 to about 75% by weight, preferably 99.99 to about 95% by weight.
Is usually about 25 to 0.00 as an active ingredient.
1% by weight, preferably about 5 to 0.01% by weight.

[0013] The composition of the present invention thus produced has an excellent effect on sclerotium disease. In particular, when the composition is applied to a paddy field at the time of transplanting seedlings or at the time of sowing paddy, rice is cultivated. Damage of sclerotium can be controlled over the entire period, and it is possible to greatly reduce labor compared to conventional control methods, and to exert more reliable control effects, and also to improve fertilization effects. Can demonstrate. Table 1 shows examples of sclerotium disease which can be controlled by the present invention.

[Table 1]

[0014] The side-strip application mentioned here is a method similar to the fertilization method generally called "side-strip application", and is applied to the lower layer of the soil near the rice plant along the arrangement of the rice plants in a stripe shape. Refers to the application form. As an example, a line that is obtained by connecting the roots of rice seedlings that are transplanted in a row and the roots of the seedlings or the seeds that are sown in a row and the paddy is approximately parallel to each other, and about 2 lines in the horizontal direction from the line. It can be shown how to apply in paddy soil 3-15 cm deep on a line 離 れ 15 cm apart. The application rate of the composition of the present invention, the application concentration may vary depending on weather conditions and the like, but usually, as the application rate of the composition of the present invention, the amount of fertilizer,
About 1 to 20000 g / a, preferably about 10 to 10000 g
/ a, the amount of compound A is about 0.1 to 300 g / a, preferably about 0.5 to 30 g / a. Further, the composition of the present invention, if necessary, further, other plant disease controlling agents, insecticides,
It can be mixed or used in combination with one or more of acaricide, nematicide, herbicide, plant growth regulator, fertilizer and soil conditioner.

[0015]

EXAMPLES The present invention will be described in more detail with reference to production examples and test examples, but the present invention is not limited to these examples. Production Example 1 granular fertilizer (manufactured by Sumitomo Chemical Co., _{Ltd., N-P 2 O 5 -K} 2
O = 14% -2% -17%, particle size 1.4 mm to 2.6 m
m) 99.6 parts are placed in a mixer without grinding elements and 30
The mixer was rotated while blowing hot air at ３５35 ° C. to impregnate the granular fertilizer with 20 parts of an acetone solution containing 0.4 part of Compound A. Thereafter, acetone is further removed by air drying, whereby the composition of the present invention (amount of active agricultural chemical: 0.4)
% By weight).

Test Example 1 When transplanting rice seedlings (variety: Nipponbare) into plastic pots (diameter 16 cm), 900 mg of the composition of the present invention produced in Production Example 1 (3.6 m as an active ingredient of pesticide).
g, N component amount: 126 mg, P component amount: 18 m
g, K component amounts of 153 mg) to the straight line passing through the position of 3 cm in width of the rice plant, to the soil of 5 cm in depth in a lateral line,
The composition was treated with the composition of the present invention. Further, instead of the composition of the present invention, 60 mg of granules containing Compound A (66 parts of Fubasami clay were added to 28 parts of bentonite in an acetone solution containing 6 parts of Compound A, mixed well by pulverization, and water was added and kneaded well. Then, granules obtained by granulation and drying: 6.0% by weight of pesticide active ingredient: 3.6 mg as pesticide active ingredient and 900 mg of pesticide-free fertilizer composition (126 mg as N ingredient, P Except for the combined use of 18 mg as the component amount and 153 mg as the K component amount), the same treatment as that of the composition treatment section 1 of the present invention was carried out, and the control section 1 was used. 900mg fertilizer composition
(126 mg as N component amount, 18 m as P component amount
The same treatment as in the treatment section 1 of the composition of the present invention was carried out except that 153 mg was used as the amounts of g and K components.
After the above treatment, each test pot was submerged to 3 cm above the soil surface, and then each test pot was placed in a glass greenhouse to continue cultivation of rice. On the 21st day after the transplantation, the sclerotium of the bacterial wilt fungus was inoculated into the root of a rice plant, and used as a source of the bacterial wilt disease. 21 after transplant
From the day to the 28th, 2m in height and 1.9 in width in the greenhouse
m, a container made of agricultural transparent film having a height of 1.2 m, each test pot is placed therein, the container is sealed all day, and the container is filled with steam using a steam generator. The humidity in the container was kept at 100%. On the 28th day after transplantation, the maximum lesion height of the sheath blight-damaged strain in each section was measured, and the control value of the composition-treated section 1 of the present invention and the control section 1 and the control section 1
The relative value of the control value of the treatment section 1 of the composition of the present invention with respect to was calculated. The control value is

[Equation 1] Control value = 100 × ((Maximum lesion height in control section 2−
The maximum lesion height in each section) / the maximum lesion height in control section 2) was calculated. The relative value of the control value of the treated section 1 of the composition of the present invention with respect to the control section 1 is represented by the following formula.

Calculated as: Relative value = 100 × (Control value of control group 1 treated with the composition of the present invention / Control value of control group 1). The test was performed in triplicate. Table 2 shows the results. As is clear from Table 2, in the treated section 1 of the composition of the present invention, remarkable suppression of sheath blight was observed as compared with the control section.

[Table 2]

[0017]

Industrial Applicability The composition of the present invention exerts an excellent effect on sclerotium disease. In particular, when the composition is applied to a paddy field at the time of transplanting seedlings or seeding of paddy, the sclerotium is applied throughout the rice cultivation period. Disease damage can be controlled, and labor can be saved significantly as compared with the conventional control method, and a more reliable control effect can be exerted, and also a fertilizing effect can be exerted.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shoji Okada 4-2-1 Takashi Takarazuka-shi, Hyogo F-term in Sumitomo Kagaku Kogyo Co., Ltd. 4H011 AA01 DA02 DC05 DD04 4H061 AA01 AA04 AA10 DD07 EE29 KK01

Claims (5)

[Claims] [Claim 1] Formula 1 A composition for controlling rice disease, comprising a compound represented by the formula (I) and a fertilizer. 2. The composition according to claim 1, wherein the rice disease is sclerotium disease. 3. A method for controlling rice plant diseases, comprising applying the composition for controlling rice plant diseases according to claim 1 to rice paddies at the time of transplanting seedlings or at the time of sowing rice seeds. 4. The control method according to claim 3, wherein the rice disease is sclerotium disease. 5. The control method according to claim 3, wherein the rice disease is at least one of sheath blight, brown rot, red rot and brown sheath rot.