JP3222530B2 - Fungicide for rice seed - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to diseases caused by filamentous fungi such as rice idiot disease, rice blast disease, rice sesame leaf blight and rice seedling blight which occur during the seedling raising period, and rice seed blight bacteria. 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 and rice brown streak.

[0002]

2. Description of the Related Art One of the active ingredients of the present invention, 2- (4)
-Chlorobenzyl) -5-isopropyl-1- (1H-
It is known that 1,2,4-triazol-1-ylmethyl) -1-cyclopentanol is effective for rice stupid rice disease, rice blast disease, and rice sesame leaf blight which occur during the seedling stage ( JP-A-1-93574) cannot control rice seedling rot caused by bacteria which occur during the rice seedling raising stage. It is also known that carbonates such as potassium bicarbonate, sodium bicarbonate, potassium carbonate, sodium carbonate, calcium hydroxide and the like are effective as agents for controlling plant diseases caused by filamentous fungi (Japanese Patent Application Laid-Open No. SHO 51-51). −6393
No. 2). The present invention utilizes the property that a filamentous fungus that is parasitic on a plant generally grows well on an acidic side and growth is inhibited on a basic side, and is useful for diseases caused by phytopathogenic bacteria. A sufficient effect cannot be obtained. In addition, by combining potassium hydroxide, sodium hydroxide, potassium bicarbonate, sodium bicarbonate, potassium carbonate, sodium carbonate, etc. with a bactericidal metal salt compound that harms crops, the effect is increased, the effect is maintained, and phytotoxicity is reduced. It is known that reduction is brought about
-27164 and JP-A-60-123410). However, the composition is synergistic and slow because the basicity of the alkalis and salts provides direct bacteriostatic power and suppresses rapid release of bactericidal metal ions. In addition, they mainly act as metal ion regulators, and the alkali and salts alone do not have sufficient disease control effects. It is known that calcium carbonate can prevent mosaic disease (virus) of vegetables by spraying, but there is no description for bacterial disease. (JP-A-48-13522) Copper compounds such as cupric hydroxide have been used as agents for controlling diseases caused by bacterial propagation in various crops.
However, the effect as a bacterial agent for seeds is not sufficient.

[0003]

In rice cultivation, almost all of the seedling raising methods have been changed to box raising seedling methods with the introduction of mechanical transplantation. In the present seedling raising method, rice seedlings are placed under a high temperature and high humidity condition of about 32 ° C. For this reason, pathogens inhabiting the soil or on the surface of paddy will be given environmental conditions suitable for propagation, and rice seedlings will be established by genus Picium, Rhizopus, Fusarium, Trichoderma, Pseudomonas, etc. Blight easily occurs and rice seedlings tend to be soft. In particular, rice blight seedlings (Giberella)
Pseudomonas plantari, Pseudomonas planta, Pseudomonas glumae, Pseudomonas glumae
i) or rice brown streak (Pseudomonas avena; Ps
Eudomonas avenae) has caused a gradual increase in rice seedling rot in recent years, and has become a major problem for raising rice seedlings. However, a seed disinfectant that is simultaneously effective against diseases caused by fungi and bacteria has not been put to practical use at present. In addition, the number of chemicals for controlling rice seedling rot caused by bacteria is small, the method of use is limited, and the effect is not always perfect. Therefore, development of a simultaneous control agent which is inexpensive, has little effect on the environment, and is effective for both fungi and bacteria is desired.

[0004]

The present inventors have conducted intensive studies to solve the above problems, and as a result, have found that 2- (4-chlorobenzyl) -5-isopropyl-1- (1H-1,2,
4-triazol-1-ylmethyl) -1-cyclopentanol (generic name ipconazole) and calcium carbonate,
By treating rice seed with a carbonate selected from basic magnesium carbonate, ammonium carbonate, ammonium bicarbonate and potassium bicarbonate, rice idiot disease, rice blast disease, rice sesame leaf blight and rice seedling blight etc. At the same time, it has been found to exhibit extremely excellent control effects on rice seedling rot caused by bacteria such as fungi caused by filamentous fungi and bacterial germs of rice seedling blight, rice seedling wilt and rice brown streak. Furthermore, bacteria are added to 2- (4-chlorobenzyl) -5-isopropyl-1- (1H-1,2,4-triazol-1-ylmethyl) -1-cyclopentanol and carbonate by adding a copper compound. The present inventors have found that a more excellent bactericidal effect and a stable effect are exhibited for the resulting disease, and completed the present invention.

That is, the present invention relates to 2- (4-chlorobenzyl) -5-isopropyl-1- (1H-1,2,4-triazol-1-ylmethyl) -1-cyclopentanol and calcium carbonate, A fungicide for rice seeds comprising a carbonate selected from magnesium carbonate, ammonium carbonate, ammonium bicarbonate and potassium hydrogen carbonate as an active ingredient, and further, if necessary, a sterilizer for rice seeds obtained by adding a copper compound to these active ingredients. Agent.

[0006] The fungicide for seeds of the present invention is generally used by a method such as seed dipping, seed dressing, and soil mixing. That is,
Seed paddy is immersed in an aqueous solution prepared by diluting the preparation to 100 ppm to 10000 ppm with water, or a powdered drug is added to a 0.1% aqueous solution.
% To 2.0% can be used after dressing the seeds. Further, 3 g to 60 g per rice seedling box is mixed with the whole soil before seeding, and 3 g to 60 g per rice seedling box is mixed with soil for covering soil, and soil after seeding or 3 g to 60 g per rice seedling box.
Any method can be used, such as mixing g with floor soil and covering after sowing (the numerical values represent the total amount of active ingredients). The amount of the drug used may vary depending on the form of preparation and the type of seed.

The drug of the present invention may use the active ingredient as it is, but is used after being formulated into generally used agricultural chemicals. That is, a carrier, a surfactant, a dispersant, an auxiliary agent, and the like are blended with the active ingredient, and powders, wettable powders, fine granules, granules,
It is formulated into an aqueous suspension (sol). As a carrier,
For example, carriers such as clay, talc, bentonite, kaolin, diatomaceous earth, white carbon, silica sand, ammonium sulfate, urea, vermiculite and the like can be mentioned. Surfactants and dispersants include, for example, diarylalkyldisulfonic acid,
Examples thereof include alcohol sulfates, alkyl aryl sulfonates, lignin sulfonates, polyoxyethylene alkyl aryl ethers, and polyoxyethylene sorbitan monoalkylates. Examples of the auxiliary include carboxymethyl cellulose, polyethylene glycol, gum arabic and the like.

The blending ratio of the active ingredient in each preparation is appropriately selected as necessary. The amount of the active ingredient is 1 to 50% (weight) for powders, fine granules, granules, and aqueous suspensions. The agent preferably ranges from 10 to 95% (by weight). It is also appropriate to mix 1 to 10% (by weight) of ipconazole in the preparation and 1 to 80% (by weight) of carbonate in the preparation. The weight ratio is 1: 0.1 to 1:50, preferably 1: 0.5 to 1:10. When a copper compound is added, the compound is preferably contained in the preparation in an amount of 1 to 10% by weight. Examples of the copper compound include hydroxides, salts, double salts, and chelate compounds of divalent copper ions, such as copper sulfate, cupric hydroxide, basic copper sulfate, and the like. Examples thereof include copper hydroxyquinoline and cupric chloride.

The application rate of the present invention varies depending on the type of the compound used, the tendency of occurrence, the degree of damage, the environmental conditions, the dosage form, the method of application and the like. Usually, 5 for seed soaking
A concentration of 00 ppm to 5,000 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 soil.
(Each numerical value represents the total amount of active ingredients.)

[0010]

EXAMPLES Next, the formulation of the fungicide of the present invention will be described with reference to Examples.
The use and effect will be specifically described, but the mixing ratio of the active ingredient and other components can be arbitrarily changed within a range not to impair the gist of the present invention. Further,% in the following examples indicates weight percentage.

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

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

Formulation Example 3 (Powder) A powder was prepared by uniformly mixing and pulverizing 2% of ipconazole, 30% of ammonium carbonate, 5% of diatomaceous earth and 63% of clay.

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

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

Formulation Example 9 (sol) 6% of ipconazole, 10% of calcium carbonate, 4% of polyoxyethylene alkyl aryl ether sulfate, 10% of ethylene glycol and 70 of water were wet-pulverized to form a sol. Agent.

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

Formulation Example 11 (granules) ipconazole 2%, basic magnesium carbonate 40%,
2% sodium salt of lauryl alcohol sulfate
5% sodium ligninsulfonate, 2% carboxymethylcellulose and 47% clay are uniformly mixed and pulverized. After adding 20% of water to the mixture and kneading the mixture and processing the mixture into granules of 14 to 32 mesh using an extrusion granulator,
Dried to granules.

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

Formulation Example 13 (sol) Ipconazole 5%, calcium carbonate 15%, cupric hydroxide 3%, polyoxyethylene alkyl aryl ether sulfate 4%, ethylene glycol 10% 67% water
Was wet-pulverized to obtain a sol.

Test Example 1 Test for Control of Rice Rot Caused by Bacterial Blight of Rice by Seed Soaking Treatment Using the agents prepared according to Formulation Examples 4 and 8,
An aqueous solution having a predetermined active ingredient concentration was prepared. Rice seeds (variety: Koganebare), which had been preliminarily immersed and inoculated with the rice seedling bacterial bacterium, were immersed in this solution for 24 hours and immediately air-dried.
After soaking the treated seeds in water for 3 days,
Embryo for 4 hours, leave in a pigeon breast state, 12 seedlings per box
0 g was seeded uniformly. Ten days after sowing, 100 seedlings per seedling box were arbitrarily selected, the disease status was investigated, and the disease severity and control value were calculated by the following criteria and formulas (Formulas 1 and 2). The test results are shown in Tables 1 and 2.

[0025]

(Equation 1)

N0: Number of seedlings not affected by disease N1: Number of seedlings affected only by leaf sheath and incomplete leaves N2: Number of seedlings affected by first leaves of true leaves N3: Even second leaves of true leaves Number of diseased seedlings N4: Number of decayed and dead seedlings

[0027]

(Equation 2)

[0028]

[Table 1]

[0029]

[Table 2]

Test Example 2 Test for Control of Rice Rot Caused by Rice Blight Bacterial Bacterium by Incorporation of Rice Seedling Bacterial Bacterium into Rice Seed (variety: Koganebare) immersed and inoculated with rice blight blight The seedlings were allowed to germinate at 30 ° C. for 24 hours. The predetermined amount of the active ingredient of the drug prepared according to Formulation Example 11 was mixed with the floor soil (Pearl Mat; Katakura Ticcarin) of one nursery box. 10 days after sowing, 10
0 seedlings are arbitrarily selected, and according to the criteria and formula described in Test Example 1,
Disease incidence was investigated and the disease severity and control value were calculated. Table 3 shows the results. In addition to the active ingredient alone as a comparative drug,
Kasugamycin 2% granules (kasmin granules) were used at the usual dosage.

[0031]

[Table 3]

Test Example 3 Control Test of Rice Rot Caused by Bacterial Blight of Rice by Seed Dressing Treatment Rice seeds (variety: Koganebare) immersed and inoculated with Bacterial Blight of Rice according to Formulation Example 5 A predetermined amount of the active ingredient of the prepared drug was wet-coated. After soaking the seeds treated with the drug in water for 3 days, the seeds were germinated at 30 ° C. for 24 hours, and the seedlings were placed in a pigeon breast state, and the seeds were uniformly sown in an amount of 120 g per box. 10 days after sowing, 100 seedlings per seedling box were arbitrarily selected, and Test Example 1 was used.
Based on the criteria and formulas described, the disease status was investigated, and the disease severity and control value were calculated. Table 4 shows the results.

[0033]

[Table 4]

Test Example 4 Control test of rice rot caused by bacterial wilt of rice by seed immersion treatment An aqueous solution having a predetermined active ingredient concentration was prepared using the agent prepared according to Preparation Example 8. Rice seeds (variety: Sasanishiki) inoculated in the field with the rice wilt disease at the heading stage were immersed in this solution for 24 hours and immediately air-dried. After soaking the seeds treated with the drug in water for 3 days, the seeds were germinated at 30 ° C. for 24 hours, and the seedlings were placed in a pigeon breast state, and the seeds were uniformly sown in an amount of 120 g per box. 15 days after sowing, 100 seedling boxes
Seedlings are arbitrarily selected, and the criteria and formulas of Test Example 1 (Equations 1, 2)
Based on the above, the disease incidence was investigated, and the disease severity and control value were calculated. Table 5 shows the results.

[0035]

[Table 5]

[0036]

EFFECTS OF THE INVENTION As is clear from the above test results, the fungicide for rice seed of the present invention is based on bacteria such as rice seedling blight, rice seedling blight and rice brown streak which occur during the seedling raising stage. For rice seedling rot and rice idiot disease caused by filamentous fungi, rice blast, rice sesame leaf blight and rice seedling blight, etc., seed soaking treatment, admixing treatment to seedling box cultivation soil, or seed dressing It has a high control effect by the treatment.

Claims (1)

(57) [Claims] 1. A method for preparing 2- (4-chlorobenzyl) -5-isopropyl-1- (1H-1,2,4-triazole-1.
-Ylmethyl) -1-cyclopentanol and a carbonate selected from calcium carbonate, basic magnesium carbonate, ammonium carbonate, ammonium bicarbonate and calcium hydrogencarbonate as active ingredients, and rice derived from phytopathogenic bacteria
A fungicide for rice seeds having a high effect on seedling rot .