JP2000095613A - 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 blast and stem rot in rice farming, 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) (E)-2- 2-[6-(2-cyanophenoxy) pyrimidin-4-yloxy]phenyl}-3-methoxyacrylic acid methyl ester of the formula and (B) a fertilizer (e.g. nitrogenous fertilizer such as urea, ammonium nitrate, etc., phosphatic fertilizer such as calcium 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]

BACKGROUND OF THE INVENTION Among rice diseases, blast (an blast occurring on leaves is called leaf blast, and a blast occurring on ears is called ear blast) is an important disease to be controlled. Diseases that form a sclerotium such as sheath rot, brown rot, red rot and brown rot (hereinafter, collectively referred to as "sclerotia"). Among the blasts, especially the panicle blast has a significant effect on the yield because the paddy to be harvested becomes sterile or incompletely rice. In addition, leaf blast disease suppresses the growth of the diseased strain and delays heading, resulting in a decrease in the number of effective ears and the weight of polished rice per ear. Furthermore, since the diseased site of leaf blast becomes a site of spore formation which is a source of infection of ear blast, the occurrence of leaf blast will induce the occurrence of ear blast.
Germination of conidia of blast fungus and invasion and spread of mycelia of blast fungus progress rapidly under climatic conditions of 20 to 25 ° C and long-term rainfall. Conventionally, as a method for controlling blast, in Honda, a powder for blast control is sprayed on foliage several times, or a granule is applied several times on the water surface. In the sclerotium disease, hyphae germinated from the sclerotium of the pathogen enter the lower leaf sheath and gradually move 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 also 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, in the case of blast, the time of its occurrence is under climatic conditions in which rainfall continues for a long period of time, and it spreads rapidly, while the chemical treatment for its control must be performed between rains. Therefore, it is difficult to perform timely treatment, and the control effect of the conventional method is not sufficient. Also, in the case of sclerotium, the disease treatment is extremely severe because the disease occurs and spreads in the middle of summer, and the spread of the disease is timely because the disease spreads rapidly. It is difficult to carry out the treatment for obtaining the same, 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 exhibit excellent effects on blast and sclerotium, which are problems in rice cultivation. By applying lateral stripes to rice fields at the time of sowing or paddy seedling, these diseases can be effectively controlled over the entire rice cultivation period,
Accordingly, it has been found that a great deal of labor can be saved in controlling rice disease, and 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 preferable. 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 the fertilizer particles 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 obtain a coated fertilizer. Can be. The weight ratio of the coating material to the coating 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, in addition to the compound A and the fertilizer, appropriate auxiliary components. 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.

Compound A (chemical name: (E) -2- {2- [6- (2-cyanophenoxy) pyrimidin-4-yloxy] phenyl} -3-
Methyl methoxyacrylate) is described in, for example,
It can be manufactured according to the manufacturing method described in JP-A-64765.

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-mentioned surfactants and dispersants, 0.1 to 10% of a suspending aid (for example, a protective colloid or a compound imparting thixotropic properties), 0 to 10% of a suitable auxiliary (for example, an antifoaming agent) Rust preventives, stabilizers, spreading agents, penetration aids, antifreezing agents, antibacterial agents, antifungal agents, 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 is effective against blast and sclerotium, especially when it is applied to a paddy field at the time of transplanting seedlings or seeding of paddy. Thus, blast and sclerotium damage can be controlled over the entire rice cultivation period, and it is possible to greatly reduce labor as compared with conventional control methods, and to exert a more reliable control effect. In addition, it can exert a fertilizing effect. 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 400 g / a, preferably about 0.5 to 40 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 of ~ 35 ° C onto the surface of the mixer, and the granular fertilizer was impregnated with 20 parts of an acetone solution containing 0.4 part of Compound A. Thereafter, acetone was further removed by air drying to obtain a composition of the present invention (amount of active agricultural chemical: 0.4% by weight).

Test Example 1 When transplanting rice seedlings (variety: Koshihikari) into a plastic pot (diameter 16 cm), 1800 mg of the composition of the present invention produced in Production Example 1 (7.2 mg as an active ingredient of agrochemicals, N component) 252 mg as P, 36 mg as P component, and 306 mg as K component).
A straight line was applied to a straight soil passing through the position of 5 cm and having a depth of 5 cm in the form of stripes, to thereby obtain a treated section 1 of the composition of the present invention. Further, instead of the composition of the present invention, 120 mg of granules containing Compound A (Compound A)
28 parts of bentonite and 66 parts of Fubasami clay are added to an acetone solution containing 6 parts of the following, and the mixture is pulverized and mixed well, water is added and kneaded well, and the mixture is granulated and dried. %: 7.2 m as the amount of the pesticidal active ingredient
g) and 1800 mg of a fertilizer composition containing no pesticide
(252 mg as N component amount, 36 m as P component amount
g and K component amounts of 306 mg), except that the lateral strip treatment was carried out in the same manner as in the treated section 1 of the composition of the present invention, and a control section 1
In place of the composition of the present invention, 1800 mg of a fertilizer composition containing no pesticide (252 mg of N component, P
Except for using 36 mg as the component amount and 306 mg as the K component amount), the lateral strip treatment was performed in the same manner as the treatment section 1 of the composition of the present invention to obtain a control section 2. After each test pot,
Water was immersed to 3 cm above the soil surface, and then each test pot was placed in a glass greenhouse to continue cultivation of paddy rice. 1 after rice transplantation
On the fifth day, the greenhouse is 2m long, 1.9m wide and 1.2m high.
A container made of transparent film for agriculture is installed, and each test pot is placed therein, and a pot (diameter 8 cm) in which a rice blast diseased rice plant is planted is placed near each test pot,
The blast was the source of infection. The container is sealed for about 8 hours and 30 minutes per day, the container is filled with steam using a steam generator, and the humidity in the container is kept at 100%.
The container was opened at other times. On the 23rd day after the transplantation, each test pot was taken out of the container and cultivation was continued in a glass greenhouse. On the 33rd day after the transplantation, the incidence of leaf blast in each section was calculated. The control value of the group 1 and the relative value of the control value of the group 1 treated with the composition of the present invention to the control group 1 were calculated. Leaf blast disease is the second highest in rice
Leaf index: No disease: 0 5% or less of leaf area is diseased: 0.5 6 to 10% of leaf area is diseased: 1 to 25% of leaf area is diseased: 2 26 to 50% of leaf area Is diseased: 4 51 to 100% of the leaf area is diseased: 8, and the total value of the indices is calculated.

## EQU00001 ## Severity = 100.times. (Total index value / (8.times.number of surveyed leaves)). The control value is:

The control value was calculated as follows: control value = 100 × ((degree of disease in control group 2−degree of disease in each group) / degree of disease in control group 2). The relative value of the control value of the control composition treated section 1 of the present invention to the control section 1 was expressed by the following formula (3).

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

[Table 2]

Test Example 2 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 the active ingredient of pesticide) was prepared.
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 and 28 parts of bentonite were added to 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 fertilizer composition not containing pesticide (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 2 of the present invention was carried out to obtain a control section 3, which contained no pesticide in place of the composition of the present invention. 900mg fertilizer composition
(126 mg as N component amount, 18 m as P component amount
Except for using 153 mg as the amounts of g and K components), the same treatment as in the treatment section 2 of the composition of the present invention was performed to obtain a control section 4.
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 the transplantation, the maximum lesion height of the strains damaged by sheath blight in each group was measured, and the control value of the group treated with the composition of the present invention 2 and the control group 3 and the control group 3
The relative value of the control value of the treated section 2 of the composition of the present invention with respect to was calculated. The control value is

[Equation 4] Control value = 100 × ((Maximum lesion height in control section 4−
The maximum lesion height in each section) / the maximum lesion height in control section 4) was calculated. The relative value of the control value of the composition treated with the present invention 2 relative to the control 3 is

Calculated as follows: Relative value = 100 × (Control value of treatment section 2 of the composition of the present invention / control value of control section 3) The test was performed in triplicate. 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]

[0018]

EFFECT OF THE INVENTION The composition of the present invention exerts an excellent effect on blast and sclerotium, and in particular, is applied to a paddy field at the time of seedling transplantation or at the time of sowing of paddy, so that the composition can be used throughout rice cultivation. Can control blast and sclerotium damage over a long period of time, greatly reduce labor compared to conventional control methods, and can exert a more reliable control effect, as well as a fertilizing effect. Can also be demonstrated.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shoji Okada 4-2-1 Takashi Takarazuka-shi, Hyogo F-term within Sumitomo Kagaku Kogyo Co., Ltd. 4H011 AA03 BA04 BA05 BB09 BC03 BC06 BC07 4H061 AA01 AA04 DD07 EE29 HH44 JJ04 JJ06 KK01

Claims (7)

[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 blast. 3. The composition according to claim 1, wherein the rice disease is sclerotium. 4. A method for controlling rice plant disease, comprising applying the composition for controlling rice plant disease according to claim 1 to a paddy field at the time of transplanting seedlings or sowing paddy. 5. The control method according to claim 4, wherein the rice disease is blast. 6. The control method according to claim 4, wherein the rice disease is sclerotium disease. 7. The control method according to claim 4, wherein the rice disease is at least one of sheath blight, brown rot, red rot and brown sheath rot.