JP2000095608A - Composition for controlling rice disease and control method using the same - Google Patents

Abstract

(57) [Summary] To provide an excellent composition for controlling rice disease and a controlling method using the same. SOLUTION: General formula 1 (In the formula, R ₁ represents a methyl group or a trifluoromethyl group.) A composition for controlling rice disease comprising a benzamide compound represented by the formula (I) and a fertilizer, and a control method using the same.

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, the following general formula 2 has been obtained.

Embedded image (Wherein R ₁ represents a methyl group or a trifluoromethyl group). The composition comprising a benzamide compound and a fertilizer exhibits excellent effects on sclerotium disease which is a problem in rice cultivation. By applying the composition to a paddy field at the time of transplanting seedlings or seeding of paddy, the disease caused by sclerotium can be efficiently controlled over the entire rice cultivation period, and therefore, a large labor saving in controlling paddy rice diseases. And found 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 the benzamide compound represented by the general formula 2 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 may contain a suitable auxiliary component in addition to the benzamide compound represented by the general formula (2) and the fertilizer. By adding an auxiliary agent such as a water-insoluble inorganic substance such as talc, pyroxene or silica as the auxiliary component, it is possible to prevent caking at the time of producing the composition of the present invention.

In the benzamide compound represented by the general formula (2), a compound in which R ₁ is a methyl group (chemical name:
3'-Isopropoxy-O-toluanilide: Hereinafter, referred to as Compound A. ) Can be produced, for example, according to the production method described in JP-B-52-37048, and the compound wherein R ₁ is a trifluoromethyl group (chemical name: α, α, α-trifluoro) -3'-isopropoxy-O-toluanilide: hereinafter referred to as compound B) can be produced according to the production method described in, for example, JP-A-53-9739. As the benzamide compound represented by the general formula 2 in the composition of the present invention, at least one selected from the group consisting of compound A and compound B can be used.

[0007] The benzamide compound represented by the general formula (2) 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.
In these preparations, the compound is usually used as an active ingredient.
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.

The formulation of a flowable (suspension in water or emulsion in water) is generally prepared by adding 1 to 75% of the benzamide compound represented by the general formula (2) to 0.5 to 15% of the above-mentioned surfactant and dispersant, 0.1 to 10% of a suspension aid (for example,
Protective colloids and compounds that impart thixotropic properties),
0-10% of suitable auxiliaries (e.g. defoamers, rust inhibitors,
It can be obtained by finely dispersing in water containing a stabilizer, a spreading agent, a penetration aid, an antifreezing agent, a bactericide, a fungicide, etc.). Instead of water, an oil in which the benzamide compound represented by the general formula (2) hardly dissolves may be used as a suspension in oil. As protective colloids, for example, gelatin, casein, gums, cellulose ether,
Polyvinyl alcohol or the like is 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 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, a general formula formulated in a powder form in the mixer is used.
Benzamide compound represented by the following formula (about 1 to 50% by weight)
After about 10 to 30 minutes have passed, the mixture is dried at about 50 to 150 ° C. while operating the mixer to obtain a granular or massive composition of the present invention. 2. A solution obtained by dissolving a benzamide compound represented by the general formula (containing about 0.01 to 20% by weight of an active ingredient) in a solvent such as acetone or xylene is used by using a fluid coating apparatus or a mixer having no pulverizing element. After coating or impregnating granular or massive fertilizer, air-dry or about 50-1
The composition of the present invention is obtained by drying by heating at 50 ° C. 3. After mixing the benzamide compound represented by the general formula 2 or a wettable powder or a powder thereof (containing about 0.01 to 5% by weight of an active ingredient) with a powdered fertilizer, the mixture is mixed with a powder granulator or the like. The composition of the present invention is obtained by granulating using a granulator. 4. Formula formulated in suspension in water or emulsion in water
Benzamide compound represented by the following formula (about 1 to 75% by weight)
) 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 granular or massive, the particle size is preferably in the range of about 1 to 10 mm from the viewpoint of handling. In the composition of the present invention, the fertilizer content is usually 9
The amount is 9.999 to about 75% by weight, preferably 99.99 to about 95% by weight, and the content of the benzamide compound represented by the general formula 2 is usually about 25 to 0.001 as an active ingredient. %, 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 the benzamide compound represented by the general formula (2) is about 0.1 to 500 g / a, preferably about 0.5 to 1 g / a.
00 g / a. The composition of the present invention may further comprise, if necessary, one or more kinds of other plant disease control agents, insecticides, acaricides, nematicides, herbicides, plant growth regulators, fertilizers and soil conditioners. Can be mixed or used together.

[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) 99.20 parts was placed in a mixer having no pulverizing element, and 0.80 parts of a commercially available agent containing 75% by weight of compound A (trade name “Bashitack wettable powder 75” manufactured by Kumiai Chemical Industry Co., Ltd.) was included. After impregnating 10 parts of the acetone dispersion liquid with the granular fertilizer while rotating the mixer, the acetone is removed by air drying to obtain the fertilizer composition 1 of the present invention (agrochemical active ingredient content: 0.60% by weight). Was.

Production Example 2 Granular fertilizer (N-P ₂ O ₅ -K ₂ manufactured by Sumitomo Chemical Co., Ltd.)
O = 14% -2% -17%, particle size 1.4 mm to 2.6 m
m) 97.2 parts were placed in a mixer having no pulverizing element, and 2.80 parts of a commercially available agent containing 50% by weight of compound B (trade name "Nissan Monkat Wettable Powder 50" manufactured by Nissan Chemical Industries, Ltd.) was included. After 10 parts of the methanol dispersion was impregnated into the granular fertilizer while rotating the mixer, acetone was removed by air drying to obtain the fertilizer composition 2 of the present invention (amount of the pesticide active ingredient: 1.4% by weight). Obtained.

Test Example 1 When transplanting rice seedlings (variety: Nipponbare) into a plastic pot (diameter 16 cm), 900 mg of the present composition 1 produced according to Production Example 1 (5.
4 mg, 126 mg as N component amount, 1 as P component amount
8 mg, K component amount 153 mg) 3 cm in width of rice plant
Was applied to the soil of 5 cm in depth in a straight line passing through the position of No. 1 to form a treatment section 1 of the present invention. Further, instead of the composition 1 of the present invention, 72 mg of a granule containing the compound A (“Bashitack wettable powder 75” (supplied by Kumiai Chemical Industry Co., Ltd.,
To an acetone solution containing 10 parts of a pesticidally active ingredient (75% by weight), 63 parts of fubasami clay was added to 27 parts of bentonite, mixed well by pulverization, and water was added and kneaded well.
Granules obtained by granulation and drying: active amount of pesticide 7.5% by weight:
5.4 mg of the pesticide active ingredient and 900 mg of the pesticide-free fertilizer composition (126 m of the N component)
g, P component amount 18 mg, K component amount 153 m
g) is treated in the same manner as in the treatment section 1 of the composition of the present invention except that the composition is used in combination with g) to obtain a control section 1 and, in place of the composition 1 of the present invention,
Except for using 900 mg of the fertilizer composition containing no pesticide (126 mg for the N component, 18 mg for the P component, and 153 mg for the K component), the treatment was performed in the same manner as the composition treatment section 1 of the present invention, and the control section 2 And After the above treatment, each test pot was submerged to 3 cm above the soil surface,
Each test pot was placed in a glass greenhouse, and cultivation of rice was continued. 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. 28 from 21 days after transplantation
Until the day, the greenhouse is 2m long, 1.9m wide and 1.
A container made of a 2 m agricultural transparent film was installed, and each test pot was placed therein. The container was sealed all day, and the container was filled with steam using a steam generator, and the humidity in the container was changed. Was kept at 100%. On the 28th day after the transplantation, the highest lesion height of the sheath blight-damaged strain in each section was measured, and the control value of the inventive composition-treated section 1 and the control section 1 and the control value of the inventive composition-treated section 1 relative to the control section 1 were determined. The relative value of the control value 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]

Test Example 2 When transplanting rice seedlings (variety: Nipponbare) into a plastic pot (diameter 16 cm), 900 mg of the present composition 2 produced according to Production Example 2 (1 as pesticide active ingredient)
2.6 mg, 126 mg as an N component, 18 mg as a P component, and 153 mg as a K component) were laterally applied to a 5 cm deep soil in a straight line passing 3 cm across the rice plant. The composition was treated with the composition of the present invention. In addition, instead of the composition 2 of the present invention, 180 mg of a commercially available granule of the compound B (trade name: “Moncat granule”: manufactured by Nippon Agrochemical Co., Ltd., 7.0% by weight of the pesticide active ingredient: 12 .6
mg) and 900 mg of a pesticide-free fertilizer composition
(126 mg as N component amount, 18 m as P component amount
g, K component amounts of 153 mg), except that the composition was treated in the same manner as in the treated section 2 of the present invention, to obtain a control section 3 and a fertilizer composition containing no pesticide in place of the present composition 2. Except for using 900 mg of the product (126 mg as the N component amount, 18 mg as the P component amount, and 153 mg as the K component amount), the treatment was performed in the same manner as the composition treated section 2 of the present invention,
Control group 4 was used. Thereafter, the test was continued in the same manner as in Test Example 1. Table 3 shows the results. As is clear from Table 3, in the treated section 2 of the composition of the present invention, remarkable suppression of sheath blight was observed as compared with the control section.

[Table 3]

[0019]

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.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shoji Okada 4-2-1 Takashi Takarazuka-shi, Hyogo Sumitomo Chemical Co., Ltd. F-term (reference) 4H011 AA01 4H061 AA01 AA04 DD07 EE25 HH44 JJ04 JJ06 KK01

Claims (7)

[Claims] 1. A compound represented by the general formula: (In the formula, R ₁ represents a methyl group or a trifluoromethyl group.) A composition for controlling rice disease, comprising a benzamide compound represented by the formula: and a fertilizer. 2. The composition according to claim 1, wherein the benzamide compound is a compound represented by the general formula 1, wherein R ₁ is a methyl group. 3. The composition according to claim 1, wherein the benzamide compound is a compound represented by the general formula 1, wherein R ₁ is a trifluoromethyl group. 4. The composition according to claim 1, wherein the rice disease is sclerotium disease. 5. A method for controlling rice plant diseases, comprising applying the composition for controlling rice plant diseases according to claim 1, 2 or 3 to rice paddies at the time of transplanting seedlings or sowing paddy. 6. The control method according to claim 5, wherein the rice disease is sclerotium disease. 7. The method according to claim 5, wherein the rice disease is at least one of sheath blight, brown rot, red rot and brown sheath rot.