JP2003238313A - Agent for controlling blast blight of useful plant and method for controlling blast blight - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an agent for controlling blast blight of useful crops, enabling easy and convenient application, exhibiting high controlling effect on blast blight and having high safety and provide a method for controlling blast blight. <P>SOLUTION: The blast blight controlling agent for useful crops contains at least one component selected from cinnamic acid, cinnamic acid derivatives and their salts as an active component. The method for the control of blast blight comprises the use of the controlling agent. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an agent for controlling bacterial blight of useful plants and a method for controlling bacterial blight.

[0002]

2. Description of the Related Art Among the plant diseases, blight-causing diseases such as apple rot have occurred greatly from the end of the Meiji era to the Taisho era, and caused great damage to apple cultivation in cold regions. After that, the occurrence of this disease began to stand out again in the 1940s. Especially in the cold regions such as Hokkaido and Tohoku region, the damage of this disease is serious and it is difficult to control and treat it. In recent years, not only apples, but also pear, pear,
Other useful plants such as mulberry and kiri often suffer from blight disease,
As a countermeasure, the need for radical control and treatment methods is particularly emphasized.

[0003] Conventionally, for the treatment of blight-causing diseases represented by apple rot disease, a drug (agricultural and horticultural fungicide) for the affected part of the lesion is used.
There are known a method of applying syrup, a method of surgically treating a lesion, a mud winding method, and the like. However, the conventional fungicides for agricultural and horticultural use have poor penetration of the chemicals into the tree body, and therefore, there have been cases where a sufficient controlling effect against the blight disease cannot be obtained. Also,
Some agricultural and horticultural fungicides have mutagenicity, and were not necessarily safe to the natural environment and human body. On the other hand, although the method of surgically treating the lesion area and the mud winding method can obtain some therapeutic effect,
There is a problem that the whole procedure requires a lot of labor and time.
Therefore, there is a demand for the development of a drug that is simple and easy to use, has an excellent control effect against a blight disease that occurs in useful plants, and is highly safe for controlling a plant disease.

In connection with the present invention, Japanese Patent Laid-Open No. 5-11712
Japanese Patent Publication No. 5 discloses a lawn growth support agent containing a lignin-degrading substance such as cinnamic aldehyde, cinnamic acid and cinnamic alcohol. It is described therein that cinnamic acid and the like have a growth inhibitory effect on pathogenic filamentous fungi, which are lawn pathogens. Further, JP-A-8-259408 describes a flowering promoter for Saintpaulia containing an intermediate substance of lignin biosynthesis pathway such as cinnamic acid or a cinnamic acid derivative.
Further, JP-A-10-273404 describes a flowering promoter containing an inclusion compound of cinnamic acid and / or a cinnamic acid derivative and cyclodextrin. However, these documents do not describe that cinnamic acid or a cinnamic acid derivative has a growth inhibitory effect on plant blight fungi.

[0005]

DISCLOSURE OF THE INVENTION The present invention is a simple and easy-to-use agent which has a high control effect against the bacterial blight of useful plants and which is highly safe, and a bacterial blight of the useful plants. An object is to provide a method for controlling sexually transmitted diseases.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to achieve the above object, and as a result, cinnamic acid, a cinnamic acid derivative or a salt thereof is remarkably effective in suppressing the growth of bacterial blight fungus. It has been found that it exhibits various effects. The present invention has been completed based on the idea of using a preparation containing cinnamic acid, a cinnamic acid derivative or a salt thereof as a control agent for blight fungus of useful plants.

Thus, according to the first aspect of the present invention, cinnamic acid,
There is provided an agent for controlling bacterial blight of useful plants, which comprises at least one cinnamic acid derivative or a salt thereof as an active ingredient. The control agent of the present invention preferably contains at least one cinnamic acid or cinnamic acid derivative and cyclodextrin, and contains an inclusion compound of at least one cinnamic acid or cinnamic acid derivative and cyclodextrin. More preferably. According to a second aspect of the present invention, there is provided a method for controlling a bacterial blight of a useful plant, which comprises using the agent for controlling a bacterial blight of the present invention.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the agent for controlling blight disease and the method for controlling blight disease of the present invention will be described in detail. The control agent of the present invention is useful for the treatment of fungal plants that are infected with rot fungus such as Valsa genus or Diaporthe genus or blight fungus, and show symptoms of blight disease such as rot or blight or blight disease. Used to prevent infection.

[0009] The blight disease is a disease in which the morphology of the lesion part exhibits a rot-sap morphology, and mainly the bast part of the trunk, the sapwood parenchyma, and the cambium are invaded. Causes of invasion of the pathogenic fungus into the plant include damage due to frost damage / cold damage, dead branches, weakening of tree bodies, bud scars, and improper pruning. In general, the decay of plant material due to blight causes root rot,
There are three types: core rot and trunk sap rot. In rootstock heart rot, rotting fungi invade root system wounds and rot the heartwood of rootstocks. In the case of stem heart rot, decay fungi invade the trunk through a wound or dead branch to rot the heartwood. Further, in the rot of the trunk sapwood, rot fungus enters from dead branches or wounds and rots the sapwood portion.

As the blight disease, specifically,Vals
a ceratosperma(Tode ex F
r.)Maire(Apple rot fungus, pear rot
Fungus),Valsa paulouniae Miyab
e et Hemmi(Kiri rot fungus),Diapo
rthe nomurai Hara(Mulberry blight
Fungus),Diaporthe ambigua (Sac
c. ) Nits(Pear blight fungus),Valsa
abietis Fr.(Japanese cedar blight fungus),Diap
orthe aucubae (Sacc)(Aoki body dryness
Disease),Endothia parasitica (Mu
rrill) PJ et H. W. Anderson
(Chestnut blight fungus),Valsa freeesii (Du
by) Fuckel(Haiinugaya blight fungus)
Fungi and their imperfect generation, imperfect bacteria
The diseases caused are listed.

The useful plant targeted by the control agent of the present invention is not particularly limited as long as it is a useful plant that requires control of blight disease. For example, apple, pear, pear,
Examples thereof include fruit trees such as peach and chestnut; trees such as mulberry, kiri, aoki, cedar, and hyugagaya; and flowers such as roses and buttons.

The control agent for the bacterial blight of the present invention is cinnamic acid,
A cinnamic acid derivative or at least one of these salts is contained as an active ingredient. Cinnamic acid, a cinnamic acid derivative or a salt thereof has a remarkable antibacterial action against various plant pathogens, and a preparation containing at least one of them exhibits an excellent growth inhibitory effect against blight fungus. To do.

Cinnamic acid is a trans isomer of 3-phenyl-2-propenoic acid, which is a solid substance at room temperature (melting point: 133 ° C.). Cinnamic acid is naturally present as free or as an ester in Sophora aroma. For cinnamic acid, a method of oxidizing cinnamic aldehyde or a method of heating a mixture of benzaldehyde, acetic anhydride and potassium acetate (Perkin
Reaction) or the like.

Since cinnamic acid is a natural product or its derivative that is incorporated into the natural metabolic process, the possibility of environmental pollution is significantly lower than that of synthetic fungicides already used as pesticides. In addition, cinnamic acid has been designated as a food additive, no mutagenicity has been reported, and the cinnamic acid has extremely excellent performance with respect to other fungicides with respect to human safety.

The cinnamic acid derivative is a substance having a chemical structure similar to cinnamic acid that can be derived from cinnamic acid. For example, a compound in which a benzene nucleus of cinnamic acid is substituted with one or more substituents such as a hydroxyl group, an alkoxy group, an alkyl group and a halogen atom, and a compound in which a carboxyl group of cinnamic acid is converted into an aldehyde group or a hydroxymethyl group. , Amino acids and the like.

Specific examples of the cinnamic acid derivative include o-coumaric acid, m-coumaric acid, p-coumaric acid, caffeic acid, ferric acid, sinapinic acid, tyrosine, phenylalanine, coniferyl alcohol, sinapyl alcohol, o. -Cumaryl alcohol, m-coumaryl alcohol, p-coumaryl alcohol and the like.

The cinnamic acid or the cinnamic acid derivative can be used alone or in combination of two or more kinds. Among these, cinnamic acid, because it is easily available and exerts an excellent control effect against blight
The use of caffeic acid or p-coumaric acid is preferred.

The salt of cinnamic acid or a cinnamic acid derivative is not particularly limited, and examples thereof include alkali metal salts such as sodium and potassium; alkaline earth metal salts such as magnesium and calcium; iron, cobalt, copper, zinc, manganese and the like. Ammonium salts; salts of amines such as methylamine, ethylamine, dimethylamine, diethylamine and triethylamine; salts of pyridine; and the like. These salts can be used alone or in combination of two or more.

The salt of cinnamic acid or a cinnamic acid derivative is, for example,
(i) a cinnamic acid or a cinnamic acid derivative in a suitable solvent, an alkali metal or alkaline earth metal hydroxide, carbonate, hydrogen carbonate, hydride, acetate, phosphate, hydrogen phosphate,
Tripolyphosphate, polyphosphate, a method of reacting with acetate, etc., (ii) cinnamic acid or an alkali metal salt of a cinnamic acid derivative, an alkaline earth metal salt, a transition metal halide,
It can be produced by a method of reacting with acetate, sulfate, nitrate or the like, (iii) a method of reacting cinnamic acid or a cinnamic acid derivative with ammonia (aqueous ammonia), amines or pyridine in a suitable solvent. .

The alkali metal or alkaline earth metal hydroxide is sodium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide or the like, and the carbonate is sodium carbonate, potassium carbonate, magnesium carbonate, or the like. Calcium carbonate, etc., as hydrogen carbonate,
Examples include sodium hydrogen carbonate and potassium hydrogen carbonate. Further, as the hydride, sodium hydride, potassium hydride, calcium hydride, etc.,
As the acetate, for example, sodium acetate, potassium acetate, etc., as the phosphate, 3 sodium phosphate, 3 potassium phosphate, etc., and as the hydrogen phosphate, disodium hydrogen phosphate, hydrogen phosphate 2 Examples of potassium tripolyphosphate include potassium tripolyphosphate, potassium tripolyphosphate, and the like. Among these, it is preferable to use a salt of a weak acid and a strong base, which has a pH buffering action, can obtain a high-concentration solution, and is less likely to cause environmental pollution.

Further, in the present invention, cinnamic acid or a cinnamic acid derivative may be used in the form of an inclusion compound. When it is used in the form of an inclusion compound, an excellent growth-suppressing effect (controlling effect) can be obtained for a long period of time, and an effect of reducing odor can be obtained.

The clathrate compound is one kind of molecular complex, and one of the chemical species forms a space on a molecular scale of 1 to 3 dimensions, and the first requirement is that the size and shape fit into the space.
It is a compound formed by the incorporation (inclusion) of the other chemical species. The chemical species that provide the space is called the host, and the chemical species that is included is called the guest.

The compound serving as a host is not particularly limited as long as it forms an inclusion compound having cinnamic acid or a cinnamic acid derivative as a guest, and for example, cyclodextrin can be used.

It is considered that the inclusion compound of cinnamic acid or a cinnamic acid derivative and cyclodextrin is formed by cinnamic acid or a cinnamic acid derivative serving as a guest and entering the hollow portion of the cyclodextrin (host).

Cyclodextrin is a compound in which D-glucose forms a cyclic structure with 1,4-bonds, and α-cyclodextrin having a degree of polymerization of 6, β-cyclodextrin having a degree of polymerization of 7 and γ-having a degree of polymerization of 8 are used. Dextrin, δ-dextrin and ε-dextrin having a degree of polymerization of 9 or more, and maltosylated cyclodextrin obtained by maltosylating these are known. Among these, the use of α-dextrin, β-dextrin, α and β-maltosylated cyclodextrin, which are easily available, is preferable, and the use of β-cyclodextrin is particularly preferable.

The inclusion compound of cinnamic acid or a cinnamic acid derivative and cyclodextrin is, for example, (i) a method in which cinnamic acid or a cinnamic acid derivative and cyclodextrin are mixed neat, and optionally heated, (ii) cinnamon The solution or suspension of the acid or cinnamic acid derivative and the solution or suspension of the cyclodextrin are mixed (or kneaded) at a predetermined ratio, and heated, if desired. From the viewpoint of work efficiency, the latter method is preferable.

The solvent for dissolving or suspending cinnamic acid or a cinnamic acid derivative and cyclodextrin is not particularly limited as long as it is stable to cinnamic acid. For example, water;
Alcohols such as methanol, ethanol, n-propyl alcohol and isopropyl alcohol; ketones such as acetone, methyl ethyl ketone and cyclohexanone; esters such as methyl acetate and ethyl acetate; diethyl ether, dipropyl ether, tetrahydrofuran, 1,2
-Ethers such as dimethoxyethane; aromatic hydrocarbons such as benzene and toluene; aliphatic hydrocarbons such as n-pentane, n-hexane and n-octane; alicyclic hydrocarbons such as cyclopentane and cyclohexane Amides such as N, N-dimethylformamide and N, N-dimethylacetamide; dimethylsulfoxide, acetonitrile, dioxane and the like.

The amount of cinnamic acid or a cinnamic acid derivative and cyclodextrin used in the production of the clathrate compound is not particularly limited as long as it is within the range of forming the clathrate compound.
Cyclodextrin is in the range of 1 to 10 mol, preferably 1 to 5 mol per 1 mol of cinnamic acid or cinnamic acid derivative. The content of the cinnamic acid or the cinnamic acid derivative of the clathrate compound obtained is usually 1 to 15% by weight.

The production of clathrate compounds can be confirmed by various analytical chemistry techniques. For example, the formation of an inclusion compound of cinnamic acid and cyclodextrin is carried out by thermal analysis and X-ray diffraction of the obtained sample (inclusion compound), cinnamic acid, cyclodextrin and a mixture of cinnamic acid and cyclodextrin, respectively. , Can be confirmed by comparing the respective measurement results.

The agent for controlling blight disease of useful plants of the present invention is a cinnamic acid, a cinnamic acid derivative, a salt of a cinnamic acid or a cinnamic acid derivative, or an inclusion compound of cinnamic acid or a cinnamic acid derivative and cyclodextrin (hereinafter, These are collectively referred to as "cinnamic acid compound") and can be obtained by formulating into a usual formulation form containing the active ingredient.

The form of the preparation is not particularly limited and includes, for example, emulsions, wettable powders, solutions, emulsions, suspensions, powders,
Known formulation forms such as foams, pastes, granules, aerosols, microcapsules and the like can be mentioned.

These preparations can be prepared by a known method, for example, various additives such as the above-mentioned cinnamic acid compound as additives, liquid diluents, liquefied gas diluents, solid diluents, etc., if desired, emulsifiers, dispersants, foam formers. It can be manufactured by a known method by mixing with a surfactant such as. When water is used, an organic solvent can be used as an auxiliary solvent.

Examples of the liquid diluent include aromatic hydrocarbons (eg xylene, toluene, alkylnaphthalene etc.), halogenated aromatic hydrocarbons (eg chlorobenzene, dichlorobenzene etc.) and halogenated aliphatic hydrocarbons. (Eg 1,2-dichloroethane, methylene chloride, etc.), aliphatic hydrocarbons [eg pentane, hexane,
Cyclohexane, paraffins (eg mineral oil fractions)], alcohols (eg ethanol, propanol, butanol, glycol etc.), ethers (eg tetrahydrofuran, dioxane, 1,2-dimethoxyethane etc.), esters (eg acetic acid Use ethyl, propyl acetate, methyl lactate, etc.), ketones (eg, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.), other polar solvents (eg, N, N-dimethylformamide, dimethyl sulfoxide, etc.), water, etc. You can

The liquefied gas diluent is obtained by liquefying a gaseous substance at room temperature and atmospheric pressure, such as liquefied butane and propane.
It is possible to use those using nitrogen gas, carbon dioxide, halogenated hydrocarbons, etc. as an aerosol propellant.

As the solid diluent, soil natural minerals (for example, kaolin, clay, talc, chalk, quartz, attapal guide, montmorillonite, diatomaceous earth, etc.), soil synthetic minerals (for example, highly dispersed silicic acid, alumina, silicates, etc.), etc. Can be used.

The surfactant used as an emulsifying agent, foaming agent or dispersing agent is not particularly limited. For example, nonionic surfactants such as polyoxyethylene-added alkyl ethers, polyoxyethylene-added higher fatty acid esters, polyoxyethylene-added sorbitan higher fatty acid esters, and polyoxyethylene-added tristyryl phenyl ethers. , Polyoxyethylene-added alkyl phenyl ether sulfate, alkyl naphthalene sulfonate, polycarboxylate, lignin sulfonate, formaldehyde condensate of alkyl naphthalene sulfonate, isobutylene-maleic anhydride copolymer Etc. can be used.

If desired, a fixing agent or a coloring agent may be added to the control agent of the present invention. As a sticking agent,
Examples include natural and synthetic polymers (eg, gum arabic, polyvinyl alcohol, polyvinyl acetate, etc.). As the colorant, for example, iron oxide, titanium oxide,
It is possible to use inorganic pigments such as Prussian blue, organic dyes such as alizarin dyes, azo dyes or metal phthalocyanine dyes, and trace additives thereof such as salts of iron, manganese, boron, copper, cobalt, molybdenum and zinc. it can.

The control agent of the present invention comprises other agricultural chemical active ingredients such as agricultural and horticultural insecticides, poison baits, agricultural and horticultural fungicides, agricultural and horticultural acaricides, nematicides, fungicides, and plant growth regulators. It can be a mixture with a herbicide or a herbicide. For example, the pesticide of the present invention and an agrochemical formulation containing other agrochemical active ingredients can be mixed before use, or can be formulated by adding other agrochemical active ingredients together with a cinnamic acid compound. .

The control agent of the present invention may be a mixture with another synergist. A synergist is a compound which amplifies the use of active compounds, without necessarily being active. The control agent of the present invention is also preferably used in combination with a cellulose derivative. The cellulose derivative has a growth-inhibiting effect on the bacterial blight fungus, like the cinnamic acid compound.

Further, in the present invention, if desired, various additive components such as tree active ingredients, fertilizers, pest repellents, other fungicides, surfactants, etc. may be mixed as long as the object of the present invention is not impaired. Can be used. For example, powdered activated carbon or carbon black and an aqueous dispersion thereof,
By applying a mixture of a paste and the like, which is a product of the present invention, to the blight-causing fungus inhibitor, to the lesion-affected part of a useful plant, the activity of the pathogenic bacterium can be effectively and safely suppressed, and further the healing tissue formation of the tree can be formed. Since it is promoted, the medical condition can be recovered promptly.

In producing the control agent of the present invention,
Cinnamic acid or cinnamic acid derivative together with carbonate, hydrogen carbonate,
It is also possible to add solubilizing agents such as hydrides, acetates, phosphates, hydrogen phosphates, fatty acid salts and tripolyphosphates. When a dissolution aid is used, a high-concentration liquid preparation of cinnamic acid, a cinnamic acid derivative or a salt thereof can be prepared.

The method of using the agent for controlling blight fungus of the present invention is arbitrary, but an optimal method is applied depending on the condition. For example, 1) a method of applying the control agent of the present invention to the lesion area without scraping off the bark of the lesion area in the lesion area,
2) A method in which only the bark of the severe part in the lesion is scraped off, and then the control agent of the present invention is applied to the entire lesion.
3) Method of completely scraping off the bark of the affected area and then applying the control agent of the present invention. 4) Control of the present invention using a sprayer at the time (or before) when the blight disease occurs. A method of spraying a diluted solution of the agent is applied. In addition, these methods can increase the application amount (spray amount) as necessary,
By repeating the application (spraying) treatment several times, the curative effect of the control agent of the present invention can be further ensured.

The amount of the control agent of the present invention as described above is optional, but it is 0.0 as the pure content of cinnamic acid or a cinnamic acid derivative.
1 to 0.1% by weight is preferable.

[0044]

EXAMPLES Next, the present invention will be described more specifically with reference to examples. In the following Examples and Comparative Examples, parts or% are based on weight unless otherwise specified.

Example 1 Pearl core potato dextrose agar medium (trade name: E-, manufactured by Eiken Chemical Co., Ltd.) containing cinnamic acid at 0.05%
MF21), and this medium was dispensed into a petri dish having a diameter of 90 mm to prepare a plate. Further, as a control 1, a non-added pearl core potato dextrose agar medium, and as a control 2, 1.7% by weight of a commercially available useful plant fungicide (containing 3% thiophanate methyl) was added to the pearl core potato dextrose agar medium. The medium added to was dispensed into a petri dish having a diameter of 90 mm to prepare a plate. In the center of these plates, one platinum loop amount of Valsa ceratosperma
Mycelia of ( Todex Fr. ) Maire ) were inoculated and cultured at 24 ° C. The diameter of grown colonies was measured over time, and the inhibitory effect of cinnamic acid on apple rot fungus was examined. The survey results are shown in Table 1. In Table 1, (++) indicates that the diameter of the colony was 90 mm or more, and that it fits, and (−−) indicates that the colony did not occur (the same applies to the following tables).

[0046]

[Table 1]

From Table 1, it was found that cinnamic acid has an antibacterial effect against apple rot fungus.

Example 2 A part (0.1 g) of bark was collected from a lesion site of an apple tree exhibiting the rot disease condition. Meanwhile, a test tube containing 10 ml of sterilized water (diameter: 17 mm, length: 180 mm)
Was prepared and the bark collected was suspended in the sterilized water. Using the plate dilution method, 4 strains of fungi from mold a to mold d were separated from this supernatant by the plate dilution method. The shape and color of the colonies on the pearl core potato dextrose agar slant of these 4 strains, and the shape of the hyphae under microscopic observation were determined by the apple rot fungus ( Valsa cerat).
osperma ( Tode ex Fr. ) Mair
e ) was the same.

Cinnamic acid was added to pearl core potato dextrose agar medium (E-MF21 manufactured by Eiken Chemical Co., Ltd.) in an amount of 0.
Add this to a concentration of 05%, and add this medium to a diameter of 9c
It was dispensed into a petri dish of m to prepare a plate. Into the center of this plate, 4 mycelia of molds a to m d separated from the apple tree lesion of one platinum loop were planted, respectively, at 24 ° C.
It was cultured in. By measuring the diameter of grown colonies over time and comparing this value with the diameter of colonies grown on cinnamic acid-free medium (control), we investigated the growth inhibitory effect of cinnamic acid on apple tree isolates. It was Table 2 shows the survey results.

[0050]

[Table 2]

As is clear from these results, cinnamic acid has an antibacterial effect on the rot-infected apple tree-derived isolates.

Example 3 0.05% of cinnamic acid in pearl core potato dextrose agar medium (Eiken Chemical Co., Ltd., trade name: E-MF21)
It was added so as to have a concentration of 10%, and this medium was dispensed into a petri dish having a diameter of 9 cm to prepare a plate. In addition, as a control, a pearl core potato dextrose agar medium plate without addition was similarly prepared. In the center of these plates, one platinum loop amount of apple rot fungus ( Valsa c
eratosperma ( Tode ex Fr. ) M
air ), mulberry blight fungus ( Diaportthe no)
murai Hara ) and pear blight fungus ( Diap
orthe medusaea Nits ) were inoculated and cultured at 24 ° C. The diameter of grown colonies was measured over time, and cinnamic acid apple rot fungus,
The growth inhibitory effect against mulberry blight fungus and pear blight fungus was investigated. The survey results are shown in Table 3.

[0053]

[Table 3]

As is clear from these results, cinnamic acid has a growth inhibitory effect against various bacterial blight fungi.

Production Example 1 ( Production of Cyclodextrin Inclusion Compound of Cinnamic Acid) 10-% aqueous solution of β-cyclodextrin in water 10
0 part was heated to about 70 ° C. to completely dissolve β-cyclodextrin, and 19.5 parts of a 10% ethanol solution of cinnamic acid in ethanol was gradually added thereto with stirring. Then, the heating was stopped, and the mixture was allowed to cool to room temperature while continuing stirring. The deposited precipitate was collected by filtration and dried under reduced pressure at a temperature of 60 ° C or lower. The obtained powder was analyzed by thermal analysis and X-ray diffraction to obtain cinnamic acid, β-
Diffraction results different from cyclodextrin and their mixtures were shown, indicating that inclusion compounds were formed. The content of cinnamic acid in the clathrate compound was 11.3%.

Example 4 Cyclodextrin package of cinnamic acid
Derivatives of apple rot fungus and rot diseased apple trees
Test of growth inhibitory effect on isolated strain Add cinnamic acid cyclodextrin inclusion compound to pearl core potato dextrose agar medium (Eiken Chemical Co., Ltd., trade name: E-MF21) to 0.5%. ,
This medium was dispensed into a petri dish having a diameter of 90 mm to prepare a plate.

Further, as a control 1, a non-added pearl core potato dextrose agar medium was used, and as a control 2, a medium in which only cyclodextrin was added to the pearl core potato dextrose agar medium so as to be 4.0%, the diameter of each was 90 mm. Was dispensed into a petri dish to prepare a plate. In the center of these plates, one platinum loop amount of apple rot fungus ( Valsa ceratosperma)
( Todex Fr. ) Maire ) and the mycelium of the isolated mold a derived from the apple tree lesion used in Example 2 were planted and cultured at 24 ° C. The diameter of the grown colonies was measured with time, and the growth inhibitory effect of the cyclodextrin inclusion compound of cinnamic acid on apple rot fungus was examined. The survey results are shown in Table 4.

[0058]

[Table 4]

As is clear from this result, the cyclodextrin inclusion compound of cinnamic acid has an excellent growth inhibitory effect on apple rot fungus and isolates derived from rot apple tree.

[0060]

EFFECTS OF THE INVENTION As described above, the agent for controlling blight disease of the present invention has an excellent effect of suppressing the growth of bacterial disease of the disease blight and has excellent safety to the environment and the human body. Is. Further, according to the control method of the present invention, it is possible to simply and reliably obtain an excellent healing effect against blight disease of useful plants.

Continued front page    (72) Inventor Tadamitsu Nakamura             1-7-6 Nihonbashi Bakurocho, Chuo-ku, Tokyo               Dainichi Seika Kogyo Co., Ltd. (72) Inventor Yasuo Takano             1-7-6 Nihonbashi Bakurocho, Chuo-ku, Tokyo               Dainichi Seika Kogyo Co., Ltd. F-term (reference) 4H011 AA01 BA01 BA04 BB06 BC19                       DA02 DA06 DA13 DA15 DA16                       DD04 DH10

Claims (4)

[Claims] 1. An agent for controlling bacterial blight of a useful plant, which comprises at least one of cinnamic acid, a cinnamic acid derivative or a salt thereof as an active ingredient. 2. The agent for controlling bacterial blight of useful plants according to claim 1, which comprises at least one cinnamic acid or a cinnamic acid derivative and cyclodextrin. 3. The agent for controlling bacterial blight of useful plants according to claim 1, which comprises an inclusion compound of at least one of cinnamic acid or a cinnamic acid derivative and cyclodextrin. 4. A method for controlling blight disease of useful plants, which comprises using the agent for controlling blight disease of any one of claims 1 to 3.