JP2000095618A - 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 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) S-methyl= benzo[1,2,3]thiadiazole-7-carbothioate 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. Consequently a secure controlling effect can be expected.

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 which occurs on leaves is called leaf blast and a blast which occurs on ears is called ear blast) is an important disease to be controlled. can give. In particular, ear blast has a significant influence on the yield because paddy rice 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.

[0003]

However, it is difficult to predict the time of occurrence of blast, and many times of chemical treatments for controlling blasts are heavy labors and heavy burdens for farmers. In addition, blast disease occurs under the weather conditions where rainfall continues for a long time.
It spreads rapidly, and on the other hand, since the chemical treatment for its control must be performed during the rain, it is difficult to perform the treatment in a timely manner, and in the conventional method, the control effect is not sufficient. It was not something.

[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 rice blast, which is a problem in rice cultivation. By applying lateral stripes to paddy fields at the time of sowing, it is possible to efficiently control blast disease over the entire rice cultivation period, and therefore, it is possible to save a great deal of labor in controlling paddy rice diseases, and more reliably control The inventors have found that effects can be obtained, and have reached 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: S-methylbenzo [1,
[2,3] thiadiazole-7-carbothioate) can be produced, for example, according to the production method described in JP-A-64-90176.

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 produced in this way has an excellent effect on blast, and in particular, when the composition is applied to a paddy field at the time of transplanting seedlings or at the time of sowing of paddy, the composition can be used during rice cultivation. It can control blast damage over the whole, can greatly reduce labor compared to conventional control methods, can exert more reliable control effect, and also exhibits fertilizer effect obtain.

[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) 99.8 parts were placed in a mixer having no pulverizing element, and 10 parts of an acetone solution containing 0.2 part of Compound A was impregnated into granular fertilizer while rotating the mixer, and then acetone was removed by air drying. As a result, a composition of the present invention (agrochemical active ingredient content: 0.2% by weight) was obtained.

Test Example 1 When transplanting rice seedlings (variety: Koshihikari) into plastic pots (diameter 16 cm), 1800 mg of the composition of the present invention produced in Production Example 1 (3.6 mg as an active ingredient of pesticide, 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, 180 mg of granules containing Compound A (Compound A)
29 parts of bentonite and 69 parts of fubasami clay were added to an acetone solution containing 2 parts of the above, and the mixture was pulverized and mixed well, water was added and kneaded well, and the mixture was granulated and dried. %: 3.6 m as pesticide active ingredient amount
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 1 shows the results. As is clear from Table 1, 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 1]

[0017]

EFFECT OF THE INVENTION The composition of the present invention exerts an excellent effect on blast, and in particular, it is applied to a paddy field at the time of transplanting seedlings or at the time of sowing of paddy, so that the composition of the present invention can prevent blast over the entire rice cultivation period. Damage can be controlled, labor can be saved significantly as compared with the conventional control method, and a more reliable control effect can be exerted, and also a fertilization effect can be exerted.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shoji Okada 4-2-1 Takashi Takarazuka-shi, Hyogo Sumitomo Chemical Co., Ltd. F-term (reference) 4H011 AA03 BA02 BB10 BC18 DA02 DC10 DD04 DE01 DG06 4H061 AA01 AA04 DD07 EE29 HH44 JJ04 KK01

Claims (4)

[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. 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 blast.