JPH05221812A - Fungicide for seed of rice plant - Google Patents

Abstract

PURPOSE:To obtain an inexpensive fungicide for seed of rice plant, effective for both filamentous fungi and bacteria, having slight influence on environment by blending ipconazole with a carbonate such as CaCO3 or KHCO3 or further a copper compound. CONSTITUTION:Ipconazole, namely, 2-(4-chlorobenzyl)-5-isopropyl-1-(1H-1,2,4- triazol-1-ylmethyl)-1-cyclopentanol is combined with a carbonate selected from calcium carbonate, basic magnesium carbonate, ammonium carbonate, ammonium hydrogencarbonate and potassium hydrogencarbonate to give a fungicide for seeds of rice plant. The fungicide is preferably mixed with a copper compound selected from a hydroxide, a salt, a double salt and a chelate compound of bivalent copper ion. The fungicide shows extremely excellently controlling effects simultaneously on disease injuries caused by filamentous fungi such as disease infected with gibberella of rice seeding, blast of rice plant cupric non and seed and seedling rot of rice plant caused by bacteria such as bacterium of bacterial grain rot, etc.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to diseases caused by filamentous fungi such as rice scabbard disease, rice blast disease, rice sesame leaf blight and rice seedling blight, and rice blight fungus, which occur during the seedling raising period. The present invention relates to a fungicide for rice seeds, which is effective for controlling rice seedling rot caused by bacteria such as rice seedling wilt fungus and rice brown stripe fungus.

[0002]

2. Description of the Related Art 2- (4) which is one of the active ingredients of the present invention
-Chlorobenzyl) -5-isopropyl-1- (1H-
1,2,4-Triazol-1-ylmethyl) -1-cyclopentanol is known to be effective against rice scabbard disease, rice blast disease, and rice sesame leaf blight which occur at the seedling raising stage ( Japanese Unexamined Patent Publication (Kokai) No. 1-93574) cannot control rice seedling rot caused by bacteria that occur during the rice seedling raising period. It is also already known that carbonates such as potassium hydrogen carbonate, sodium hydrogen carbonate, potassium carbonate, sodium carbonate and calcium hydroxide are effective as agents for controlling plant diseases caused by filamentous fungi (JP-A-51). -6393
No. 2). The present invention utilizes the property that filamentous fungi that parasitize plants generally grow well on the acidic side and that growth is inhibited on the basic side, and for diseases caused by phytopathogenic bacteria, Not enough effect. Further, by combining potassium hydroxide, sodium hydroxide, potassium hydrogen carbonate, sodium hydrogen carbonate, potassium carbonate, sodium carbonate and the like with a bactericidal metal salt compound which is harmful to crops, the effect is increased, the effect is sustained and the effect of the drug is reduced. It is known that a reduction is brought about (Japanese Patent Laid-Open No. 55-55155).
-27164 and JP-A-60-123410). However, the composition is synergistic and gradual because the basicity of the above-mentioned alkalis and salts brings about a direct bacteriostatic force and suppresses the rapid release of bactericidal metal ions. In addition, they exert an effect of inhibiting plant pathogens, and they mainly act as metal ion regulators, and the effect of controlling diseases by alkalis and salts alone is not sufficient. It is known that calcium carbonate can prevent vegetable mosaic disease (viral) by spraying, but there is no description of bacterial disease. (Unexamined-Japanese-Patent No. 48-13522) Copper compounds, such as cupric hydroxide, are used as a control agent of the disease caused by the propagation of bacteria in various crops.
However, the effect as a bacterial agent for seeds is not sufficient.

[0003]

[Problems to be Solved by the Invention] With the introduction of mechanical transplantation in rice cultivation, most of the seedling raising methods have been changed to box seedling raising methods. In this seedling raising method, rice seedlings are placed under hot and humid conditions of around 32 ° C. Therefore, for pathogenic bacteria that live in the soil or on the surface of the paddy, it will give suitable environmental conditions for breeding, Pythium spp, Rhizopus spp, Fusarium spp, Trichoderma spp, Pseudomonas spp. Blight easily occurs, and rice seedlings tend to become soft. In particular, rice scab seedling disease fungus (Gibberella
Fujikuroi; Gibbellera fujikuroi) causes rice scab seedling disease, rice seed blight fungus (Pseudomonas gourmet; Pseudomonas glumae), rice seedling blight (Pseudomonas plantari; Pseudomonas plantari)
i), or rice stripe disease (Pseudomonas avena; Ps
Rice seedling rot caused by eudomonas avenae) has been gradually increasing in recent years, and has become a major problem for rice seedling raising. However, a seed disinfectant effective at the same time against diseases caused by filamentous fungi and bacteria has not yet been put into practical use. In addition, the number of controlling agents against rice seedling rot caused by bacteria is small in number, the method of use is limited, and the effect is not always perfect. Therefore, there is a demand for the development of a simultaneous control agent that is inexpensive and has little effect on the environment and is effective against both filamentous fungi and bacteria.

[0004]

Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventors have found that 2- (4-chlorobenzyl) -5-isopropyl-1- (1H-1,2,
4-triazol-1-ylmethyl) -1-cyclopentanol (generic name ipconazol) and calcium carbonate,
By treating rice seeds with a carbonate selected from basic magnesium carbonate, ammonium carbonate, ammonium bicarbonate and potassium hydrogen carbonate, rice scab seed disease, rice blast disease, rice sesame leaf blight and rice seedling blight etc. It has been found that it simultaneously exhibits an extremely excellent control effect against the diseases caused by the filamentous fungus and the rice seedling rot caused by the bacteria such as rice blight fungus, rice seedling blight fungus and rice brown stripe fungus. Furthermore, by adding a copper compound to 2- (4-chlorobenzyl) -5-isopropyl-1- (1H-1,2,4-triazol-1-ylmethyl) -1-cyclopentanol and carbonate, bacteria were added. The present invention has been completed by finding that it exerts a further excellent bactericidal effect and stable effect against the resulting disease.

That is, the present invention relates to 2- (4-chlorobenzyl) -5-isopropyl-1- (1H-1,2,4-triazol-1-ylmethyl) -1-cyclopentanol, calcium carbonate, basic A rice seed bactericide containing a carbonate selected from magnesium carbonate, ammonium carbonate, ammonium bicarbonate and potassium hydrogen carbonate as an active ingredient, and further, if necessary, a copper seed sterilizer containing a copper compound added to these active ingredients. It is an agent.

The fungicide for seeds of the present invention is usually used by methods such as seed soaking, seed dressing, and soil mixing. That is,
The seed paddy is immersed in an aqueous solution prepared by diluting the preparation with water to 100 ppm to 10000 ppm, or the powdered medicine is added in an amount of 0.1.
It can be used by dressing with seeds at a ratio of% -2.0%. In addition, 3 g to 60 g per rice seedling raising box is mixed with the whole soil before sowing, 3 g to 60 g per rice seedling raising box is mixed with soil for covering soil, and after seeding it is covered with soil or 3 g to 60 g per rice seedling raising box.
It can be used by any method such as mixing g with the soil and covering with soil after sowing (the numerical values represent the total amount of active ingredients). The amount of the above drug used may vary depending on the formulation form and seed type.

The active ingredient of the drug of the present invention may be used as it is, but it is used by formulating it into a generally used agricultural chemical formulation. That is, the active ingredient is mixed with a carrier, a surfactant, a dispersant, an auxiliary agent, etc., and a powder, a wettable powder, a fine granule, a granule,
It is formulated into an aqueous suspension (sol) and the like. As a carrier,
Examples include carriers such as clay, talc, bentonite, kaolin, diatomaceous earth, white carbon, silica sand, ammonium sulfate, urea and vermiculite. As the surfactant and the dispersant, for example, diarylalkyldisulfonic acid,
Examples thereof include alcohol sulfates, alkyl aryl sulfonates, lignin sulfonates, polyoxyethylene alkyl aryl ethers, and polyoxyethylene sorbitan monoalkylate. Examples of the auxiliary agent include carboxymethyl cellulose, polyethylene glycol, gum arabic and the like.

The mixing ratio of the active ingredient in each preparation is appropriately selected according to need, but the amount of the active ingredient is 1 to 50% (weight) for powder, fine granules, granules and aqueous suspension, and hydrated. The agent is preferably in the range of 10 to 95% (weight). In addition, it is appropriate that ipconazole be blended in the formulation at 1 to 10% (weight) and carbonate be blended in the formulation at 1 to 80% (wt). The blending ratio of ipconazole and carbonate is as necessary. The weight ratio is 1: 0.1 to 1:50, preferably 1: 0.5 to 1:10. When a copper compound is added, it is preferable to add 1 to 10% by weight of the copper compound in the preparation. Examples of the copper compound include hydroxides, salts, double salts and chelate compounds of divalent copper ions, such as copper sulfate, cupric hydroxide and basic copper sulfate. Examples include hydroxyquinoline copper and cupric chloride.

The application rate of the present invention varies depending on the type of compound used, the tendency of occurrence, degree of damage, environmental conditions, dosage form, application method and the like. Normally 5 for seed soaking treatment
A concentration of 00 ppm to 5000 ppm, a dressing amount of 0.1% to 2.0% (dry seed weight ratio) in the case of seed dressing treatment, and 3 g to 60 g per seedling box in the case of mixing rice seedling cultivation medium.
It is used in the admixture amount of (all numerical values represent the total amount of active ingredients).

[0010]

EXAMPLES Next, examples are given to prepare the germicide of the present invention,
The applications and effects will be specifically described, but the mixing ratio of the active ingredient and the other ingredients can be arbitrarily changed within the range not impairing the gist of the present invention. Moreover,% in the following examples shows a weight percentage.

Formulation Example 1 (powder) 2% ipconazole, 15% calcium carbonate, 5 diatomaceous earth
% And 78% of clay were uniformly mixed and pulverized to obtain a powder.

Formulation Example 2 (powder) 2% ipconazole, 20% basic magnesium carbonate,
5% diatomaceous earth and 73% clay were uniformly mixed and pulverized to obtain a powder.

Formulation Example 3 (Dust) 2% ipconazole, 30% ammonium carbonate, 5% diatomaceous earth and 63% clay were uniformly mixed and ground to give a powder.

Formulation Example 4 (wettable powder) Ipconazole 6%, calcium carbonate 15%, diatomaceous earth 7
4%, sodium dinaphthylmethanedisulfonate 2% and sodium ligninsulfonate 3% were uniformly mixed and pulverized to obtain a wettable powder.

Formulation Example 5 (wettable powder) Ipconazole 6%, calcium carbonate 60%, diatomaceous earth 2
9%, sodium dinaphthylmethanedisulfonate 2% and sodium ligninsulfonate 3% were uniformly mixed and pulverized to obtain a wettable powder.

Formulation Example 6 (wettable powder) Ipconazole 6%, ammonium bicarbonate 50%, diatomaceous earth 39%, dinaphthylmethane disulfonate sodium 2
% And sodium lignin sulfonate 3% were uniformly mixed and pulverized to obtain a wettable powder.

Formulation Example 7 (wettable powder) Ipconazole 6%, potassium hydrogen carbonate 40%, diatomaceous earth 49%, sodium dinaphthylmethane disulfonate 2%
And 3% sodium lignin sulfonate were uniformly mixed and pulverized to obtain a wettable powder.

Formulation Example 8 (wettable powder) Ipconazole 6%, calcium carbonate 10%, cupric hydroxide 2%, diatomaceous earth 78%, sodium dinaphthylmethanedisulfonate 2% and sodium ligninsulfonate 3
% Was uniformly mixed and pulverized to obtain a wettable powder.

Formulation Example 9 (sol agent) 6% of ipconazole, 10% of calcium carbonate, 4% of polyoxyethylene alkylaryl ether sulfate, 10% of ethylene glycol and 70 of water are wet-milled to form a sol. I used it as an agent.

Formulation Example 10 (sol agent) 6% ipconazole, 20% basic magnesium carbonate,
Polyoxyethylene alkyl aryl ether sulfate 4
%, Ethylene glycol 10% and water 60% were wet pulverized to obtain a sol agent.

Formulation Example 11 (Granule) Ipconazole 2%, basic magnesium carbonate 40%,
2% sodium salt of lauryl alcohol sulfate,
5% sodium lignin sulfonate, 2% carboxymethyl cellulose and 47% clay are uniformly mixed and ground. 20% of water was added to this mixture and kneaded, and after processed into granules of 14 to 32 mesh using an extrusion type granulator,
Dried into granules.

Formulation Example 12 (powder) 2% ipconazole, 20% basic magnesium carbonate,
Basic copper sulfate 1%, diatomaceous earth 5%, and clay 72% were uniformly mixed and pulverized to obtain a powder.

Formulation Example 13 (sol agent) 5% ipconazole, 15% calcium carbonate, 3% cupric hydroxide, 4% polyoxyethylene alkylaryl ether sulfate, 10% ethylene glycol and 67% of water
Was wet pulverized to obtain a sol agent.

Test Example 1 Control test by seed soaking treatment for rice rot caused by bacterial wilt disease of rice, using agents prepared according to Formulation Examples 4 and 8
An aqueous solution having a predetermined active ingredient concentration was prepared. Rice seeds (cultivar: Kaneharu) pre-soaked and inoculated with rice hull bacterial pathogens were immersed in this chemical solution for 24 hours and immediately air-dried.
After soaking the chemical-treated seeds in water for 3 days,
Sprout for 4 hours, put in a pigeon chest condition, and 12 per box for raising seedlings.
An amount of 0 g was seeded uniformly. Ten days after sowing, 100 seedlings were arbitrarily selected per nursery box, and the disease occurrence status was investigated and the disease severity and control value were calculated according to the following criteria and formulas (Equation 1 and Equation 2). The test results are shown in Tables 1 and 2.

[0025]

[Equation 1]

N0: Number of seedlings that are not affected N1: Number of seedlings that are affected only in leaf sheath and incomplete leaves N2: Number of seedlings that are affected in first leaf of true leaf N3: Even in second leaf of true leaf Number of diseased seedlings N4: Number of seedlings that rot and died

[0027]

[Equation 2]

[0028]

[Table 1]

[0029]

[Table 2]

Test Example 2 Controlling test for rice spoilage caused by rice wilting bacterial fungus by rice soil seedling cultivation soil mixing treatment Rice seeds (variety: Kaneharu) inoculated with the rice wilting bacterial fungus are soaked in water, The seeds were germinated at 30 ° C. for 24 hours, put in a pigeon chest state, and 120 g of the seedlings were uniformly sown. A predetermined amount of active ingredient of the drug prepared according to Formulation Example 11 was mixed with the bed soil (pearl mat; manufactured by Katakura Chikkarin Co., Ltd.) of one box for raising seedlings. 10 days after sowing, 10 per seedling raising box
0 seedlings were arbitrarily selected, and according to the criteria and formulas described in Test Example 1,
The disease incidence was investigated and the disease severity and control value were calculated. The results are shown in Table 3. In addition to the active ingredient single agent as a comparative drug,
Kasugamycin 2% granules (casmin granules) were used at the doses normally used.

[0031]

[Table 3]

Test Example 3 Control test by seed dressing treatment against rice rot caused by bacterial wilt of rice blight, according to Formulation Example 5 to rice seed (variety: Kaneharu) inoculated with rice bacterial wilt fungus by dip inoculation A predetermined amount of active ingredient of the prepared drug was wet-coated. The chemical-treated seeds were soaked in water for 3 days, and then germinated at 30 ° C. for 24 hours to make a pigeon chest, and 120 g of the seeds were uniformly sown. Ten days after sowing, 100 seedlings were arbitrarily selected per nursery box, and test example 1
The disease status was investigated and the disease severity and control value were calculated according to the criteria and formulas described. The results are shown in Table 4.

[0033]

[Table 4]

Test Example 4 Control test by seed soaking treatment for rice rot caused by bacterial wilt disease of rice A chemical solution prepared according to Formulation Example 8 was used to prepare an aqueous solution having a predetermined active ingredient concentration. A rice seed (variety: Sasanishi) inoculated in the field with rice bacterial wilt disease at the heading stage was dipped in this solution for 24 hours and immediately air-dried. The chemical-treated seeds were soaked in water for 3 days, and then germinated at 30 ° C. for 24 hours to make a pigeon chest, and 120 g of the seeds were uniformly sown. 15 days after sowing 100 per seedling raising box
Seedlings are arbitrarily selected, and the criteria and formulas of Test Example 1 (Equation 1 and Equation 2)
Based on the above, the disease incidence was investigated and the disease severity and control value were calculated. The results are shown in Table 5.

[0035]

[Table 5]

[0036]

EFFECTS OF THE INVENTION As is clear from the above test results, the fungicide for disinfecting rice seeds of the present invention shows that bacteria such as rice wilt bacterial disease, rice seedling wilt bacterial disease, and rice brown stripe disease bacteria occur in the seedling raising period. Against rice seedling rot caused by F., and rice scab seedling disease caused by filamentous fungi, rice blast disease, rice sesame leaf blight and rice seedling wilting, etc., seed soaking treatment, admixture with seedling box soil, or seed dressing It has a high control effect by treatment.

[Procedure amendment]

[Submission date] April 20, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

Formulation Example 8 (wettable powder) Ipconazole 5 %, calcium carbonate 10%, cupric hydroxide 2%, diatomaceous earth 78%, sodium dinaphthylmethanedisulfonate 2% and sodium ligninsulfonate 3
% Was uniformly mixed and pulverized to obtain a wettable powder.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction content]

[0036]

As is apparent from the above test results, the fungicide for rice seeds of the present invention is caused by bacteria such as rice blight fungus, rice seedling blight fungus and rice brown stripe fungus that occur during the seedling raising period. Rice seedling rot and rice scab seedling disease, rice blast disease, rice sesame leaf blight and rice seedling blight caused by filamentous fungi, seed soaking treatment, admixture in culture medium for nursery boxes, or seed dressing It has a high control effect by treatment.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location A01N 55:02) A 7106-4H

Claims (2)

[Claims] 1. 2- (4-chlorobenzyl) -5-isopropyl-1- (1H-1,2,4-triazol-1-ylmethyl) -1-cyclopentanol and calcium carbonate, basic magnesium carbonate, A fungicide for rice seeds, comprising a carbonate selected from ammonium carbonate, ammonium bicarbonate and potassium hydrogen carbonate as an active ingredient. 2. A fungicide for rice seeds, which comprises a copper compound selected from hydroxides, salts, double salts and chelate compounds of divalent copper ions, added to the active ingredient according to claim 1.