Plant disease controlling composition and use thereof

A plant disease controlling composition containing a pyridazine compound represented by formula (I):wherein R1 represents a chlorine atom, a bromine atom, a cyano group, or a methyl group, and R2 represents a hydrogen atom or a fluorine atom; andat least one carboxamide compound selected from the group consisting of bixafen, isopyrazam, boscalid, fluopyram, fluxapyroxad, sedaxane, penflufen, flutolanil, mepronil, carboxin, thifluzamide, penthiopyrad, and furametpyr.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a Section 371 of International Application No. PCT/JP2011/068198, filed Aug. 9, 2011, which was published in the Japanese language on Feb. 16, 2012, under International Publication No. WO 2012/020776 A1, and the disclosure of which is incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to a plant disease controlling composition and use thereof.

BACKGROUND ART

Conventionally, many compounds for controlling plant diseases have been developed and put into practical use (see, for example, Patent Literature 1, Patent Literature 2).

CITATION LIST

Patent Literature

SUMMARY OF INVENTION

Technical Problem

An object of the present invention is to provide a composition having an excellent efficacy in controlling plant diseases.

Solution to Problem

The present invention primarily provides a plant disease controlling composition containing a pyridazine compound represented by the following formula (I) and at least one carboxamide compound selected from the following group (A). The composition has an excellent efficacy in controlling plant diseases.

More specifically, the present invention is as follows.

[1] A plant disease controlling composition, containing a pyridazine compound represented by formula (I):

wherein
R1represents a chlorine atom, a bromine atom, a cyano group or a methyl group, and
R2represents a hydrogen atom or a fluorine atom, and
at least one carboxamide compound selected from Group (A).
Group (A):

[2] The plant disease controlling composition according to [1], wherein a weight ratio of the pyridazine compound and the carboxamide compound satisfies the pyridazine compound/the carboxamide compound=0.1/1 to 10/1.

[3] A method for controlling plant diseases, including a step of applying effective amounts of a pyridazine compound represented by formula (I):

wherein
R1represents a chlorine atom, a bromine atom, a cyano group or a methyl group, and
R2represents a hydrogen atom or a fluorine atom, and
at least one carboxamide compound selected from Group (A) to a plant or soil for growing a plant.
Group (A):

[4] The method for controlling plant diseases according to [3], wherein a weight ratio of the pyridazine compound and the carboxamide compound satisfies the pyridazine compound/the carboxamide compound=0.1/1 to 10/1.

[5] The method for controlling plant diseases according to [3] or [4], wherein the plant or soil for growing a plant is wheat or soil for growing wheat.

Advantageous Effects of Invention

Plant diseases can be controlled by the present invention.

DESCRIPTION OF EMBODIMENTS

The plant disease controlling composition of the present invention (hereinafter, referred to as the composition of the present invention) contains a pyridazine compound represented by formula (I):

wherein
R1represents a chlorine atom, a bromine atom, a cyano group or a methyl group, and
R2represents a hydrogen atom or a fluorine atom (hereinafter, referred to as the pyridazine compound), and
at least one carboxamide compound (hereinafter, referred to as the carboxamide compound) selected from Group (A).
Group (A):

Examples of the pyridazine compound to be used in the composition of the present invention include the following pyridazine compounds:

A pyridazine compound represented by formula (I) wherein R1is a chlorine atom or a methyl group;

A pyridazine compound represented by formula (I) wherein R1is a chlorine atom;

A pyridazine compound represented by formula (I) wherein Rz is a methyl group;

A pyridazine compound represented by formula (I) wherein R1is a cyano group;

A pyridazine compound represented by formula (I) wherein R2is a hydrogen atom;

A pyridazine compound represented by formula (I) wherein R2is a fluorine atom;

A pyridazine compound represented by formula (I) wherein R1is a chlorine atom or a methyl group and R2is a hydrogen atom; and

A pyridazine compound represented by formula (I) wherein R1is a chlorine atom or a methyl group and R2is a fluorine atom.

Specific examples of the pyridazine compound include the following compounds:

a pyridazine compound represented by formula (I) wherein R1is a chlorine atom and R2is a hydrogen atom (hereinafter, referred to as the pyridazine compound (1));

a pyridazine compound represented by formula (I) wherein R1is a bromine atom and R2is a hydrogen atom (hereinafter, referred to as the pyridazine compound (2));

a pyridazine compound represented by formula (I) wherein R1is a cyano group and R2is a hydrogen atom (hereinafter, referred to as the pyridazine compound (3));

a pyridazine compound represented by formula (I) wherein R1is a methyl group and R2is a hydrogen atom (hereinafter, referred to as the pyridazine compound (4));

a pyridazine compound represented by formula (I) wherein R1is a chlorine atom and R2is a fluorine atom (hereinafter, referred to as the pyridazine compound (5));

a pyridazine compound represented by formula (I) wherein R1is a bromine atom and R2is a fluorine atom (hereinafter, referred to as the pyridazine compound (6));

a pyridazine compound represented by formula (I) wherein R1is a cyano group and R2is a fluorine atom (hereinafter, referred to as the pyridazine compound (7)); and

a pyridazine compound represented by formula (I) wherein R1is a methyl group and R2is a fluorine atom (hereinafter, referred to as the pyridazine compound (8)).

Of the pyridazine compounds, the pyridazine compound represented by formula (I) wherein R1is a chlorine atom or a bromine atom can be produced by a method described, for example, in International Publication No. WO2005/121104.

Of the pyridazine compounds, the pyridazine compound represented by formula (I) wherein R1is a methyl group can be produced by a method described, for example, in International Publication No. WO2006/001175.

Of the pyridazine compounds, a compound (I-2) represented by formula (I) wherein R1is a cyano group can be produced by reacting, for example, a compound (I-1) represented by formula (I) wherein R1is bromine atom among the pyridazine compounds with copper cyanide.

wherein R2is the same as defined above.

The reaction is usually carried out in the presence of a solvent.

As the solvent to be used in the reaction, for example, an aprotic polar solvent such as N,N-dimethylacetamide is mentioned.

The amount of copper cyanide to be used in the reaction is usually 1 to 1.5 moles relative to 1 mole of compound (I-1) by ratio.

The reaction temperature of the reaction usually falls within the range of 120 to 180° C. and the reaction time usually falls within the range of 1 to 24 hours.

After completion of the reaction, for example, the reaction mixture is mixed with water and an organic solvent and filtrated. After the filtrate is separated, the obtained organic layer is further washed with water, dried and concentrated. Through these operations, the compound (I-2) can be isolated. The isolated compound (I-2) may be further purified by chromatography, recrystallization, and others.

Of the pyridazine compounds, a pyridazine compound (I-4) represented by formula (I) wherein R1is a methyl group can be produced by reacting a pyridazine compound (I-3) represented by formula (I) wherein R1is a chlorine atom among the pyridazine compounds with a Grignard reagent represented by formula (II):
CH3—MgX  (II)
wherein X represents a bromine atom or a chlorine atom
in the presence of an iron catalyst.

wherein R2is the same as defined above.

The reaction is carried out usually in the presence of a solvent.

As the solvent to be used in the reaction, for example, tetrahydrofuran, diethylether and N-methylpyrrolidone and a mixture of these are mentioned. In the case where the reaction solvent is a mixture of tetrahydrofuran and N-methylpyrrolidone, the mixing ratio (volume ratio) of tetrahydrofuran to N-methylpyrrolidone usually falls within the range of 30:1 to 3:1.

As the iron catalyst to be used in the reaction, for example, iron (III) acetylacetonate and iron (III) chloride are mentioned. The amount of iron catalyst to be used is usually 0.01 to 0.3 moles relative to 1 mole of the compound (I-3) by ratio.

The reaction temperature of the reaction usually falls within the range of −20° C. to 30° C. and the reaction time usually falls within the range of 0.1 to 6 hours.

After completion of the reaction, for example, the reaction mixture is mixed with hydrochloric acid and extracted with an organic solvent. The obtained organic layer is washed with water, dried and concentrated. Through these operations, the compound (I-4) can be isolated. The isolated compound (I-4) can be further purified by chromatography, recrystallization, and others.

The carboxamide compounds each are known and described, for example, in “THE PESTICIDE MANUAL—14th EDITION (published by BCPC) ISBN 1901396142”, International Publication No. WO2003/070705, International Publication No. WO2004/035589, International Publication No. WO2004/016088, International Publication No. WO2006/087343, International Publication No. WO2006/015866 and International Publication No. WO2003/010149. These compounds are formed of commercially available preparations or synthesized by known methods.

In the composition of the present invention, the weight ratio of the pyridazine compound and the carboxamide compound usually satisfies the pyridazine compound/the carboxamide compound=0.01/1 to 500/1 and preferably 0.1/1 to 10/1.

The composition of the present invention may be a mixture of the pyridazine compound and the carboxamide compound, as it is; however, the composition of the present invention is usually formulated into a preparation by mixing the pyridazine compound, the carboxamide compound and an inactive carrier, optionally adding a surfactant and other preparation adjuvants and preparing an oil solution, an emulsion, a flowable agent, a wettable powder, a granular wettable powder, a powder, a granule, and others. Such a preparation can be used as an agent for controlling plant diseases, directly or as a mixture with other inactive components.

In the composition of the present invention, the pyridazine compound and the carboxamide compound are usually contained in a total amount of 0.1 to 99 wt %, preferably 0.2 to 90 wt % and more preferably 1 to 80 wt %.

Examples of a solid carrier that is used in formulating into a preparation include fine powders or grains formed of minerals such as kaolin clay, Attapulgite clay, bentonite, montmorillonite, acid clay, pyrophyllite, talc, diatom earth and calcite; naturally occurring organic substances such as a corncob powder and a walnut shell flour; synthetic organic substances such as urea; salts such as calcium carbonate and ammonium sulfate; and synthetic inorganic substances such as synthesized water-containing silicon oxide. Examples of a liquid carrier include aromatic hydrocarbons such as xylene, alkylbenzene and methylnaphthalene; alcohols such as 2-propanol, ethylene glycol, propylene glycol and ethylene glycol monoethyl ether; ketones such as acetone, cyclohexanone and isophorone; vegetable oils such as soybean oil and cotton seed oil; petroleum aliphatic hydrocarbons, esters, dimethylsulfoxide, acetonitrile and water.

Examples of a surfactant include anionic surfactants such as an alkyl sulfate, an alkylaryl sulfonate, a dialkylsulfosuccinate, a polyoxyethylene alkylaryl etherphosphate, a lignin sulfonate and a naphthalene sulfonate formaldehyde polycondensate; nonionic surfactants such as polyoxyethylene alkylaryl ether, a polyoxyethylene alkylpolyoxypropylene block copolymer and a sorbitan fatty acid ester; and cationic surfactants such as an alkyltrimethyl ammonium salt.

Examples of other preparation adjuvants include water-soluble polymers such as polyvinyl alcohol and polyvinyl pyrrolidone; polysaccharides such as gum Arabic, alginic acid and a salt thereof, CMC (carboxymethylcellulose) and xanthan gum; inorganic substances such as aluminum magnesium silicate and alumina sol; antiseptic agents, colorants and stabilizers such as PAP (acidic isopropyl phosphate) and BHT.

The composition of the present invention can be also prepared by formulating the pyridazine compound and the carboxamide compound separately into preparations by the aforementioned method, and thereafter, mixing the preparations or, if necessary, diluting them and mixing the dilutions.

The composition of the present invention can be used for protecting plants from plant diseases.

Examples of the plant diseases from which plants are effectively controlled by the composition of the present invention include the following.

Disease of Japanese radish:Alternarialeaf spot (Alternaria brassicicola).

Diseases of turfgrass: dollar spot (Sclerotinia homeocarpa), and brown patch and large patch (Rhizoctonia solani).

Diseases of seeds or diseases in the initial stages of crop plants caused by bacteria of e.g., the genusAspergillus, the genusPenicillium, the genusFusarium, the genusGibberella, the genusTricoderma, the genusThielaviopsis, the genusRhizopus, the genusMucor, the genusCorticium, the genusPhoma, the genusRhizoctoniaand the genusDiplodia.

Viral diseases of crop plants mediated by viruses of e.g., the genus Polymixa or the genusOlpidium.

Examples of plants to which the composition of the present invention can be applied include the following plants:

The plants mentioned above may include plants which were made resistant by gene recombination techniques.

Of the above diseases, the diseases occurring in wheat, for which a particularly high control efficacy is expected.

Examples of the composition of the present invention include the following compositions:

a composition containing the pyridazine compound (1) and bixafen;

a composition containing the pyridazine compound (1) and isopyrazam;

a composition containing the pyridazine compound (1) and boscalid;

a composition containing the pyridazine compound (1) and fluopyram;

a composition containing the pyridazine compound (1) and fluxapyroxad;

a composition containing the pyridazine compound (1) and sedaxane;

a composition containing the pyridazine compound (1) and penflufen;

a composition containing the pyridazine compound (1) and flutolanil;

a composition containing the pyridazine compound (1) and mepronil;

a composition containing the pyridazine compound (1) and carboxin;

a composition containing the pyridazine compound (1) and thifluzamide;

a composition containing the pyridazine compound (1) and penthiopyrad;

a composition containing the pyridazine compound (1) and furametpyr;

a composition containing the pyridazine compound (2) and bixafen;

a composition containing the pyridazine compound (2) and isopyrazam;

a composition containing the pyridazine compound (2) and boscalid;

a composition containing the pyridazine compound (2) and fluopyram;

a composition containing the pyridazine compound (2) and fluxapyroxad;

a composition containing the pyridazine compound (2) and sedaxane;

a composition containing the pyridazine compound (2) and penflufen;

a composition containing the pyridazine compound (2) and flutolanil;

a composition containing the pyridazine compound (2) and mepronil;

a composition containing the pyridazine compound (2) and carboxin;

a composition containing the pyridazine compound (2) and thifluzamide;

a composition containing the pyridazine compound (2) and penthiopyrad;

a composition containing the pyridazine compound (2) and furametpyr;

a composition containing the pyridazine compound (3) and bixafen;

a composition containing the pyridazine compound (3) and isopyrazam;

a composition containing the pyridazine compound (3) and boscalid;

a composition containing the pyridazine compound (3) and fluopyram;

a composition containing the pyridazine compound (3) and fluxapyroxad;

a composition containing the pyridazine compound (3) and sedaxane;

a composition containing the pyridazine compound (3) and penflufen;

a composition containing the pyridazine compound (3) and flutolanil;

a composition containing the pyridazine compound (3) and mepronil;

a composition containing the pyridazine compound (3) and carboxin;

a composition containing the pyridazine compound (3) and thifluzamide;

a composition containing the pyridazine compound (3) and penthiopyrad;

a composition containing the pyridazine compound (3) and furametpyr;

a composition containing the pyridazine compound (4) and bixafen;

a composition containing the pyridazine compound (4) and isopyrazam;

a composition containing the pyridazine compound (4) and boscalid;

a composition containing the pyridazine compound (4) and fluopyram;

a composition containing the pyridazine compound (4) and fluxapyroxad;

a composition containing the pyridazine compound (4) and sedaxane;

a composition containing the pyridazine compound (4) and penflufen;

a composition containing the pyridazine compound (4) and flutolanil;

a composition containing the pyridazine compound (4) and mepronil;

a composition containing the pyridazine compound (4) and carboxin;

a composition containing the pyridazine compound (4) and thifluzamide;

a composition containing the pyridazine compound (4) and penthiopyrad;

a composition containing the pyridazine compound (4) and furametpyr;

a composition containing the pyridazine compound (5) and bixafen;

a composition containing the pyridazine compound (5) and isopyrazam;

a composition containing the pyridazine compound (5) and boscalid;

a composition containing the pyridazine compound (5) and fluopyram;

a composition containing the pyridazine compound (5) and fluxapyroxad;

a composition containing the pyridazine compound (5) and sedaxane;

a composition containing the pyridazine compound (5) and penflufen;

a composition containing the pyridazine compound (5) and flutolanil;

a composition containing the pyridazine compound (5) and mepronil;

a composition containing the pyridazine compound (5) and carboxin;

a composition containing the pyridazine compound (5) and thifluzamide;

a composition containing the pyridazine compound (5) and penthiopyrad;

a composition containing the pyridazine compound (5) and furametpyr;

a composition containing the pyridazine compound (6) and bixafen;

a composition containing the pyridazine compound (6) and isopyrazam;

a composition containing the pyridazine compound (6) and boscalid;

a composition containing the pyridazine compound (6) and fluopyram;

a composition containing the pyridazine compound (6) and fluxapyroxad;

a composition containing the pyridazine compound (6) and sedaxane;

a composition containing the pyridazine compound (6) and penflufen;

a composition containing the pyridazine compound (6) and flutolanil;

a composition containing the pyridazine compound (6) and mepronil;

a composition containing the pyridazine compound (6) and carboxin;

a composition containing the pyridazine compound (6) and thifluzamide;

a composition containing the pyridazine compound (6) and penthiopyrad;

a composition containing the pyridazine compound (6) and furametpyr;

a composition containing the pyridazine compound (7) and bixafen;

a composition containing the pyridazine compound (7) and isopyrazam;

a composition containing the pyridazine compound (7) and boscalid;

a composition containing the pyridazine compound (7) and fluopyram;

a composition containing the pyridazine compound (7) and fluxapyroxad;

a composition containing the pyridazine compound (7) and sedaxane;

a composition containing the pyridazine compound (7) and penflufen;

a composition containing the pyridazine compound (7) and flutolanil;

a composition containing the pyridazine compound (7) and mepronil;

a composition containing the pyridazine compound (7) and carboxin;

a composition containing the pyridazine compound (7) and thifluzamide;

a composition containing the pyridazine compound (7) and penthiopyrad;

a composition containing the pyridazine compound (7) and furametpyr;

a composition containing the pyridazine compound (8) and bixafen;

a composition containing the pyridazine compound (8) and isopyrazam;

a composition containing the pyridazine compound (8) and boscalid;

a composition containing the pyridazine compound (8) and fluopyram;

a composition containing the pyridazine compound (8) and fluxapyroxad;

a composition containing the pyridazine compound (8) and sedaxane;

a composition containing the pyridazine compound (8) and penflufen;

a composition containing the pyridazine compound (8) and flutolanil;

a composition containing the pyridazine compound (8) and mepronil;

a composition containing the pyridazine compound (8) and carboxin;

a composition containing the pyridazine compound (8) and thifluzamide;

a composition containing the pyridazine compound (8) and penthiopyrad;

a composition containing the pyridazine compound (8) and furametpyr;

a composition containing the pyridazine compound (1) and bixafen in a weight ratio satisfying the pyridazine compound (1)/bixafen=0.1/1 to 10/1;

a composition containing the pyridazine compound (1) and isopyrazam in a weight ratio satisfying the pyridazine compound (1)/isopyrazam=0.1/1 to 10/1;

a composition containing the pyridazine compound (1) and boscalid in a weight ratio satisfying the pyridazine compound (1)/boscalid=0.1/1 to 10/1;

a composition containing the pyridazine compound (1) and fluopyram in a weight ratio satisfying the pyridazine compound (1)/fluopyram=0.1/1 to 10/1;

a composition containing the pyridazine compound (1) and fluxapyroxad in a weight ratio satisfying the pyridazine compound (1)/fluxapyroxad=0.1/1 to 10/1;

a composition containing the pyridazine compound (1) and sedaxane in a weight ratio satisfying the pyridazine compound (1)/sedaxane=0.1/1 to 10/1;

a composition containing the pyridazine compound (1) and penflufen in a weight ratio satisfying the pyridazine compound (1)/penflufen=0.1/1 to 10/1;

a composition containing the pyridazine compound (1) and flutolanil in a weight ratio satisfying the pyridazine compound (1)/flutolanil=0.1/1 to 10/1;

a composition containing the pyridazine compound (1) and mepronil in a weight ratio satisfying the pyridazine compound (1)/mepronil=0.1/1 to 10/1;

a composition containing the pyridazine compound (1) and carboxin in a weight ratio satisfying the pyridazine compound (1)/carboxin=0.1/1 to 10/1;

a composition containing the pyridazine compound (1) and thifluzamide in a weight ratio satisfying the pyridazine compound (1)/thifluzamide=0.1/1 to 10/1;

a composition containing the pyridazine compound (1) and penthiopyrad in a weight ratio satisfying the pyridazine compound (1)/penthiopyrad=0.1/1 to 10/1;

a composition containing the pyridazine compound (1) and furametpyr in a weight ratio satisfying the pyridazine compound (1)/furametpyr=0.1/1 to 10/1;

a composition containing the pyridazine compound (2) and bixafen in a weight ratio satisfying the pyridazine compound (2)/bixafen=0.1/1 to 10/1;

a composition containing the pyridazine compound (2) and isopyrazam in a weight ratio satisfying the pyridazine compound (2)/isopyrazam=0.1/1 to 10/1;

a composition containing the pyridazine compound (2) and boscalid in a weight ratio satisfying the pyridazine compound (2)/boscalid=0.1/1 to 10/1;

a composition containing the pyridazine compound (2) and fluopyram in a weight ratio satisfying the pyridazine compound (2)/fluopyram=0.1/1 to 10/1;

a composition containing the pyridazine compound (2) and fluxapyroxad in a weight ratio satisfying the pyridazine compound (2)/fluxapyroxad=0.1/1 to 10/1;

a composition containing the pyridazine compound (2) and sedaxane in a weight ratio satisfying the pyridazine compound (2)/sedaxane=0.1/1 to 10/1;

a composition containing the pyridazine compound (2) and penflufen in a weight ratio satisfying the pyridazine compound (2)/penflufen=0.1/1 to 10/1;

a composition containing the pyridazine compound (2) and flutolanil in a weight ratio satisfying the pyridazine compound (2)/flutolanil=0.1/1 to 10/1;

a composition containing the pyridazine compound (2) and mepronil in a weight ratio satisfying the pyridazine compound (2)/mepronil=0.1/1 to 10/1;

a composition containing the pyridazine compound (2) and carboxin in a weight ratio satisfying the pyridazine compound (2)/carboxin=0.1/1 to 10/1;

a composition containing the pyridazine compound (2) and thifluzamide in a weight ratio satisfying the pyridazine compound (2)/thifluzamide=0.1/1 to 10/1;

a composition containing the pyridazine compound (2) and penthiopyrad in a weight ratio satisfying the pyridazine compound (2)/penthiopyrad=0.1/1 to 10/1;

a composition containing the pyridazine compound (2) and furametpyr in a weight ratio satisfying the pyridazine compound (2)/furametpyr=0.1/1 to 10/1;

a composition containing the pyridazine compound (3) and bixafen in a weight ratio satisfying the pyridazine compound (3)/bixafen=0.1/1 to 10/1;

a composition containing the pyridazine compound (3) and isopyrazam in a weight ratio satisfying the pyridazine compound (3)/isopyrazam=0.1/1 to 10/1;

a composition containing the pyridazine compound (3) and boscalid in a weight ratio satisfying the pyridazine compound (3)/boscalid=0.1/1 to 10/1;

a composition containing the pyridazine compound (3) and fluopyram in a weight ratio satisfying the pyridazine compound (3)/fluopyram=0.1/1 to 10/1;

a composition containing the pyridazine compound (3) and fluxapyroxad in a weight ratio satisfying the pyridazine compound (3)/fluxapyroxad=0.1/1 to 10/1;

a composition containing the pyridazine compound (3) and sedaxane in a weight ratio satisfying the pyridazine compound (3)/sedaxane=0.1/1 to 10/1;

a composition containing the pyridazine compound (3) and penflufen in a weight ratio satisfying the pyridazine compound (3)/penflufen=0.1/1 to 10/1;

a composition containing the pyridazine compound (3) and flutolanil in a weight ratio satisfying the pyridazine compound (3)/flutolanil=0.1/1 to 10/1;

a composition containing the pyridazine compound (3) and mepronil in a weight ratio satisfying the pyridazine compound (3)/mepronil=0.1/1 to 10/1;

a composition containing the pyridazine compound (3) and carboxin in a weight ratio satisfying the pyridazine compound (3)/carboxin=0.1/1 to 10/1;

a composition containing the pyridazine compound (3) and thifluzamide in a weight ratio satisfying the pyridazine compound (3)/thifluzamide=0.1/1 to 10/1;

a composition containing the pyridazine compound (3) and penthiopyrad in a weight ratio satisfying the pyridazine compound (3)/penthiopyrad=0.1/1 to 10/1;

a composition containing the pyridazine compound (3) and furametpyr in a weight ratio satisfying the pyridazine compound (3)/furametpyr=0.1/1 to 10/1;

a composition containing the pyridazine compound (4) and bixafen in a weight ratio satisfying the pyridazine compound (4)/bixafen=0.1/1 to 10/1;

a composition containing the pyridazine compound (4) and isopyrazam in a weight ratio satisfying the pyridazine compound (4)/isopyrazam=0.1/1 to 10/1;

a composition containing the pyridazine compound (4) and boscalid in a weight ratio satisfying the pyridazine compound (4)/boscalid=0.1/1 to 10/1;

a composition containing the pyridazine compound (4) and fluopyram in a weight ratio satisfying the pyridazine compound (4)/fluopyram=0.1/1 to 10/1;

a composition containing the pyridazine compound (4) and fluxapyroxad in a weight ratio satisfying the pyridazine compound (4)/fluxapyroxad=0.1/1 to 10/1;

a composition containing the pyridazine compound (4) and sedaxane in a weight ratio satisfying the pyridazine compound (4)/sedaxane=0.1/1 to 10/1;

a composition containing the pyridazine compound (4) and penflufen in a weight ratio satisfying the pyridazine compound (4)/penflufen=0.1/1 to 10/1;

a composition containing the pyridazine compound (4) and flutolanil in a weight ratio satisfying the pyridazine compound (4)/flutolanil=0.1/1 to 10/1;

a composition containing the pyridazine compound (4) and mepronil in a weight ratio satisfying the pyridazine compound (4)/mepronil=0.1/1 to 10/1;

a composition containing the pyridazine compound (4) and carboxin in a weight ratio satisfying the pyridazine compound (4)/carboxin=0.1/1 to 10/1;

a composition containing the pyridazine compound (4) and thifluzamide in a weight ratio satisfying the pyridazine compound (4)/thifluzamide=0.1/1 to 10/1;

a composition containing the pyridazine compound (4) and penthiopyrad in a weight ratio satisfying the pyridazine compound (4)/penthiopyrad=0.1/1 to 10/1;

a composition containing the pyridazine compound (4) and furametpyr in a weight ratio satisfying the pyridazine compound (4)/furametpyr=0.1/1 to 10/1;

a composition containing the pyridazine compound (5) and bixafen in a weight ratio satisfying the pyridazine compound (5)/bixafen=0.1/1 to 10/1;

a composition containing the pyridazine compound (5) and isopyrazam in a weight ratio satisfying the pyridazine compound (5)/isopyrazam=0.1/1 to 10/1;

a composition containing the pyridazine compound (5) and boscalid in a weight ratio satisfying the pyridazine compound (5)/boscalid=0.1/1 to 10/1;

a composition containing the pyridazine compound (5) and fluopyram in a weight ratio satisfying the pyridazine compound (5)/fluopyram=0.1/1 to 10/1;

a composition containing the pyridazine compound (5) and fluxapyroxad in a weight ratio satisfying the pyridazine compound (5)/fluxapyroxad=0.1/1 to 10/1;

a composition containing the pyridazine compound (5) and sedaxane in a weight ratio satisfying the pyridazine compound (5)/sedaxane=0.1/1 to 10/1;

a composition containing the pyridazine compound (5) and penflufen in a weight ratio satisfying the pyridazine compound (5)/penflufen=0.1/1 to 10/1;

a composition containing the pyridazine compound (5) and flutolanil in a weight ratio satisfying the pyridazine compound (5)/flutolanil=0.1/1 to 10/1;

a composition containing the pyridazine compound (5) and mepronil in a weight ratio satisfying the pyridazine compound (5)/mepronil=0.1/1 to 10/1;

a composition containing the pyridazine compound (5) and carboxin in a weight ratio satisfying the pyridazine compound (5)/carboxin=0.1/1 to 10/1;

a composition containing the pyridazine compound (5) and thifluzamide in a weight ratio satisfying the pyridazine compound (5)/thifluzamide=0.1/1 to 10/1;

a composition containing the pyridazine compound (5) and penthiopyrad in a weight ratio satisfying the pyridazine compound (5)/penthiopyrad=0.1/1 to 10/1;

a composition containing the pyridazine compound (5) and furametpyr in a weight ratio satisfying the pyridazine compound (5)/furametpyr=0.1/1 to 10/1;

a composition containing the pyridazine compound (6) and bixafen in a weight ratio satisfying the pyridazine compound (6)/bixafen=0.1/1 to 10/1;

a composition containing the pyridazine compound (6) and isopyrazam in a weight ratio satisfying the pyridazine compound (6)/isopyrazam=0.1/1 to 10/1;

a composition containing the pyridazine compound (6) and boscalid in a weight ratio satisfying the pyridazine compound (6)/boscalid=0.1/1 to 10/1;

a composition containing the pyridazine compound (6) and fluopyram in a weight ratio satisfying the pyridazine compound (6)/fluopyram=0.1/1 to 10/1;

a composition containing the pyridazine compound (6) and fluxapyroxad in a weight ratio satisfying the pyridazine compound (6)/fluxapyroxad=0.1/1 to 10/1;

a composition containing the pyridazine compound (6) and sedaxane in a weight ratio satisfying the pyridazine compound (6)/sedaxane=0.1/1 to 10/1;

a composition containing the pyridazine compound (6) and penflufen in a weight ratio satisfying the pyridazine compound (6)/penflufen=0.1/1 to 10/1;

a composition containing the pyridazine compound (6) and flutolanil in a weight ratio satisfying the pyridazine compound (6)/flutolanil=0.1/1 to 10/1;

a composition containing the pyridazine compound (6) and mepronil in a weight ratio satisfying the pyridazine compound (6)/mepronil=0.1/1 to 10/1;

a composition containing the pyridazine compound (6) and carboxin in a weight ratio satisfying the pyridazine compound (6)/carboxin=0.1/1 to 10/1;

a composition containing the pyridazine compound (6) and thifluzamide in a weight ratio satisfying the pyridazine compound (6)/thifluzamide=0.1/1 to 10/1;

a composition containing the pyridazine compound (6) and penthiopyrad in a weight ratio satisfying the pyridazine compound (6)/penthiopyrad=0.1/1 to 10/1;

a composition containing the pyridazine compound (6) and furametpyr in a weight ratio satisfying the pyridazine compound (6)/furametpyr=0.1/1 to 10/1;

a composition containing the pyridazine compound (7) and bixafen in a weight ratio satisfying the pyridazine compound (7)/bixafen=0.1/1 to 10/1;

a composition containing the pyridazine compound (7) and isopyrazam in a weight ratio satisfying the pyridazine compound (7)/isopyrazam=0.1/1 to 10/1;

a composition containing the pyridazine compound (7) and boscalid in a weight ratio satisfying the pyridazine compound (7)/boscalid=0.1/1 to 10/1;

a composition containing the pyridazine compound (7) and fluopyram in a weight ratio satisfying the pyridazine compound (7)/fluopyram=0.1/1 to 10/1;

a composition containing the pyridazine compound (7) and fluxapyroxad in a weight ratio satisfying the pyridazine compound (7)/fluxapyroxad=0.1/1 to 10/1;

a composition containing the pyridazine compound (7) and sedaxane in a weight ratio satisfying the pyridazine compound (7)/sedaxane=0.1/1 to 10/1;

a composition containing the pyridazine compound (7) and penflufen in a weight ratio satisfying the pyridazine compound (7)/penflufen=0.1/1 to 10/1;

a composition containing the pyridazine compound (7) and flutolanil in a weight ratio satisfying the pyridazine compound (7)/flutolanil=0.1/1 to 10/1;

a composition containing the pyridazine compound (7) and mepronil in a weight ratio satisfying the pyridazine compound (7)/mepronil=0.1/1 to 10/1;

a composition containing the pyridazine compound (7) and carboxin in a weight ratio satisfying the pyridazine compound (7)/carboxin=0.1/1 to 10/1;

a composition containing the pyridazine compound (7) and thifluzamide in a weight ratio satisfying the pyridazine compound (7)/thifluzamide=0.1/1 to 10/1;

a composition containing the pyridazine compound (7) and penthiopyrad in a weight ratio satisfying the pyridazine compound (7)/penthiopyrad=0.1/1 to 10/1;

a composition containing the pyridazine compound (7) and furametpyr in a weight ratio satisfying the pyridazine compound (7)/furametpyr=0.1/1 to 10/1;

a composition containing the pyridazine compound (8) and boscalid in a weight ratio satisfying the pyridazine compound (8)/boscalid=0.1/1 to 10/1;

a composition containing the pyridazine compound (8) and fluopyram in a weight ratio satisfying the pyridazine compound (8)/fluopyram=0.1/1 to 10/1;

a composition containing the pyridazine compound (8) and fluxapyroxad in a weight ratio satisfying the pyridazine compound (8)/fluxapyroxad=0.1/1 to 10/1;

a composition containing the pyridazine compound (8) and sedaxane in a weight ratio satisfying the pyridazine compound (8)/sedaxane=0.1/1 to 10/1;

a composition containing the pyridazine compound (8) and penflufen in a weight ratio satisfying the pyridazine compound (8)/penflufen=0.1/1 to 10/1;

a composition containing the pyridazine compound (8) and flutolanil in a weight ratio satisfying the pyridazine compound (8)/flutolanil=0.1/1 to 10/1;

a composition containing the pyridazine compound (8) and mepronil in a weight ratio satisfying the pyridazine compound (8)/mepronil=0.1/1 to 10/1;

a composition containing the pyridazine compound (8) and carboxin in a weight ratio satisfying the pyridazine compound (8)/carboxin=0.1/1 to 10/1;

a composition containing the pyridazine compound (8) and thifluzamide in a weight ratio satisfying the pyridazine compound (8)/thifluzamide=0.1/1 to 10/1;

a composition containing the pyridazine compound (8) and penthiopyrad in a weight ratio satisfying the pyridazine compound (8)/penthiopyrad=0.1/1 to 10/1;

a composition containing the pyridazine compound (8) and furametpyr in a weight ratio satisfying the pyridazine compound (8)/furametpyr=0.1/1 to 10/1;

The method for controlling plant diseases of the present invention (hereinafter, referred to as the control method of the invention) is carried out by applying effective amounts of the pyridazine compound and the carboxamide compound to a plant or soil for growing a plant. Examples of such a plant include stem and leaves of a plant, seeds of a plant and bulbs of a plant. Note that the bulb herein means a bulb, corn, rhizome, stem tuber, root tuber and rhizophore.

In the control method of the invention, the pyridazine compound and the carboxamide compound may be applied simultaneously or separately to a plant or soil for growing a plant; however, they are usually applied in the form of the composition of the present invention, for convenience sake.

In the control method of the invention, as a method for applying the pyridazine compound and the carboxamide compound, for example, application to stem and leaves, application to soil, application to root and application to seeds are mentioned.

As the application to stem and leaves, for example, a method of applying the composition of the present invention to a surface of the plant that is grown, by spraying it to stem and leaves and spraying it to trunk, is mentioned.

As the application to root, for example, a method of soaking a whole plant or root in a drug solution containing the pyridazine compound and the carboxamide compound, and a method of attaching a solid preparation containing the pyridazine compound, the carboxamide compound and a solid carrier, to root of a plant are mentioned.

As the application to soil, for example, spraying, mixing and irrigating of a drug solution to soil are mentioned.

As the application to seeds, for example, application of the composition of the present invention to seeds or bulb of the plant to be protected from plant diseases is mentioned. Specific examples thereof include a mist spray application in which a suspension of the composition of the present invention is converted into mist and sprayed to a seed surface or a bulb surface, a smearing application in which a wettable powder, emulsion or flowable agent of the composition of the present invention is smeared to seeds or bulb by adding a small amount of water to it or directly, soaking application in which seeds are soaked in a solution of the composition of the present invention for a predetermined time, a film-coating application and pellet-coating application.

In the control method of the invention, the application amounts of the pyridazine compound and the carboxamide compound vary depending on e.g., the type of plant to be treated, type and occurrence frequency of plant disease to be controlled, type of a preparation, application time, application method, application site and weather conditions. For example, if the above compounds are applied to plant stem and leaves or soil for growing a plant, the application amounts, i.e., the total amount of the pyridazine compound and the carboxamide compound, are usually 1 to 500 g, preferably 2 to 200 g and more preferably 10 to 100 g per 1000 m2. Furthermore, if applied to seeds, the application amounts of the pyridazine compound and the carboxamide compound, i.e., the total amount of the pyridazine compound and the carboxamide compound, is usually 0.001 to 10 g and preferably 0.01 to 1 g per kg of seeds.

The above emulsion, wettable powder, flowable agent and others are usually diluted with water and then sprayed for treatment. In this case, the concentrations of the pyridazine compound and the carboxamide compound, i.e., the total concentration of the pyridazine compound and the carboxamide compound, is usually 0.0005 to 2 wt % and preferably 0.005 to 1 wt %. The above powder, granules, and the like are usually directly applied without being diluted.

EXAMPLES

The present invention will be further specifically described by way of Preparation Examples and Experimental Examples below; however, the present invention is not limited to the following Examples. Note that, in the following Examples, parts represent parts by weight unless otherwise specified.

First, Reference Production Examples of the pyridazine compound to be used in the composition of the present invention will be further specifically described.

Reference Production Example 1

To a mixture of 2-bromopropiophenone (2.13 g), 2,6-difluorophenylacetic acid (1.81 g) and acetonitrile (25 mL), triethylamine (1.52 g) was added dropwise in a water bath, stirred at room temperature for 4 hours and then allowed to stand still overnight. To the mixture, 4.57 g of 1,8-diazabicyclo[5.4.0]-7-undecene (hereinafter, referred to as DBU) was added dropwise under ice cooling. The mixture was stirred at room temperature for one hour. Thereafter, to the obtained mixture, air was blown in while stirring at room temperature for 5 hours. To the reaction mixture, ice and 1 mol/L hydrochloric acid were added. The mixture was extracted with ethyl acetate. The organic layer was sequentially washed with a saturated aqueous sodium bicarbonate solution and a saturated saline solution, dried over an anhydrous magnesium sulfate and concentrated under reduced pressure to obtain 3-(2,6-difluorophenyl)-5-hydroxy-5-methyl-4-phenyl-2(5H)-furanone (2.83 g).

To a mixture of 3-(2,6-difluorophenyl)-5-hydroxy-5-methyl-4-phenyl-2 (5H)-furanone (2.83 g) and 1-butanol (15 mL), hydrazine monohydrate (0.60 g) was added dropwise and then stirred in a warm bath of 110° C. for 2.5 hours. Subsequently, the reaction mixture was cooled to 0° C. The resultant solid substance was collected by filtration. The collected solid substance was washed with a solvent mixture of hexane and t-butyl methyl ether (1:1) and dried under reduced pressure to obtain

4-(2,6-Difluorophenyl)-6-methyl-5-phenyl-2H-pyridazin-3-one (1.54 g) and phosphorus oxychloride (10 mL) were mixed and stirred in a warm bath of 110° C. for 1.5 hours. The reaction mixture was allowed to cool to room temperature and then concentrated under reduced pressure. To the residue, ethyl acetate and ice water were added. After the mixture was separated and the organic layer was sequentially washed with a saturated aqueous sodium bicarbonate solution and a saturated saline solution and dried over anhydrous sodium sulfate and then concentrated under reduced pressure. The obtained residue (1.55 g) was washed with a solution mixture of hexane and ethyl acetate (10:1), and subsequently with tert-butyl methyl ether to obtain the pyridazine compound (1) (0.85 g).

Reference Production Example 2

4-(2,6-Difluorophenyl)-6-methyl-5-phenyl-2H-pyridazin-3-one (2.09 g) and phosphorus oxybromide (8.0 g) are mixed and stirred in a warm bath of 85° C. for 1.5 hours and subsequently in a warm bath of 95° C. for one hour. The reaction mixture is allowed to cool to room temperature, suspended in ethyl acetate (about 20 mL) and poured in ice (about 100 g). After the obtained solution is neutralized with sodium bicarbonate water, the residue is extracted with ethyl acetate and separated. The organic layer is washed with a saline solution, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The obtained residue is subjected to silica gel column chromatography to obtain the pyridazine compound (2).

The pyridazine compound (2) (0.72 g), copper cyanide (0.22 g) and N,N-dimethylacetamide (6 mL) are mixed and stirred under heat reflux for 3 hours. The reaction mixture is allowed to cool to room temperature, added to ethyl acetate and water (about 50 mL for each) and filtrated with cerite. The filtrate is separated and the organic layer is washed with a saline solution, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The obtained residue is subjected to silica gel column chromatography to obtain the pyridazine compound (3).

Reference Production Example 3

The pyridazine compound (1) (1.90 g), iron (III) acetylacetonate (0.42 g), tetrahydrofuran (60 mL) and N-methylpyrrolidone (6 mL) are mixed. To this, methylmagnesium bromide (3.0 mol/L diethylether solution) (6 mL) is added while stirring under ice cooling. To the reaction mixture, a 1 mol/L aqueous hydrochloric acid solution (30 mL) is added dropwise and water is added. Thereafter, the reaction mixture is extracted with ethyl acetate. The organic layer is sequentially washed with sodium bicarbonate water and a saline solution, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The obtained residue is subjected to silica gel column chromatography to obtain the pyridazine compound (4).

Reference Production Example 4

6-Methyl-5-phenyl-4-(2,4,6-trifluorophenyl)-2H-pyridazin-3-one (2.21 g) and phosphorus oxybromide (8.0 g) are mixed and stirred in a warm bath of 85° C. for 1.5 hours and subsequently in a warm bath of 95° C. for one hour. The reaction mixture is allowed to cool to room temperature, suspended in ethyl acetate (about 20 mL) and poured in ice (about 100 g). After the obtained solution is neutralized with sodium bicarbonate water, the residue is extracted with ethyl acetate and separated. The organic layer is washed with a saline solution, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The obtained residue is subjected to silica gel column chromatography to obtain the pyridazine compound (6).

The pyridazine compound (6) (0.76 g), copper cyanide (0.22 g) and N,N-dimethylacetamide (6 mL) are mixed and stirred under heat reflux for 3 hours. The reaction mixture is allowed to cool to room temperature, added to ethyl acetate and water (about 50 mL for each) and filtrated with cerite. The filtrate is separated and the organic layer is washed with a saline solution, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The obtained residue is subjected to silica gel column chromatography to obtain the pyridazine compound (7).

Reference Production Example 5

The pyridazine compound (5) (2.01 g), iron (III) acetylacetonate (0.42 g), tetrahydrofuran (60 mL) and N-methylpyrrolidone (6 mL) are mixed. To this, methylmagnesium bromide (3.0 mol/L diethylether solution) (6 mL) is added while stirring under ice cooling. To the reaction mixture, a 1 mol/L aqueous hydrochloric acid solution (30 mL) is added dropwise and water is added. The reaction mixture is then extracted with ethyl acetate. The organic layer is sequentially washed with sodium bicarbonate water and a saline solution, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The obtained residue is subjected to silica gel column chromatography to obtain the pyridazine compound (8).

Next, Preparation Examples will be described.

Preparation Example 1

Preparation Example 2

Preparation Example 3

Preparation Example 4

Preparation Example 5

Preparation Example 6

Preparation Example 7

Preparation Example 8

Preparation Example 9

Preparation Example 10

Preparation Example 11

Preparation Example 12

Preparation Example 13

Preparation Example 14

Each of the pyridazine compounds (1) to (8) (2 parts), bixafen (8 parts), a mixture of white carbon and polyoxyethylene alkyl ether sulfate ammonium salt (in a weight ratio of 1:1) (35 parts) and water (55 parts) are mixed and fine-ground by a wet grinding method. In this manner, preparations are obtained.

Preparation Example 15

Each of the pyridazine compounds (1) to (8) (2 parts), isopyrazam (8 parts), a mixture of white carbon and polyoxyethylene alkyl ether sulfate ammonium salt (in a weight ratio of 1:1) (35 parts) and water (55 parts) are mixed and fine-ground by a wet grinding method. In this manner, preparations are obtained.

Preparation Example 16

Each of the pyridazine compounds (1) to (8) (2 parts), boscalid (8 parts), a mixture of white carbon and polyoxyethylene alkyl ether sulfate ammonium salt (in a weight ratio of 1:1) (35 parts) and water (55 parts) are mixed and fine-ground by a wet grinding method. In this manner, preparations are obtained.

Preparation Example 17

Each of the pyridazine compounds (1) to (8) (2 parts), fluopyram (8 parts), a mixture of white carbon and polyoxyethylene alkyl ether sulfate ammonium salt (in a weight ratio of 1:1) (35 parts) and water (55 parts) are mixed and fine-ground by a wet grinding method. In this manner, preparations are obtained.

Preparation Example 18

Each of the pyridazine compounds (1) to (8) (2 parts), fluxapyroxad (8 parts), a mixture of white carbon and polyoxyethylene alkyl ether sulfate ammonium salt (in a weight ratio of 1:1) (35 parts) and water (55 parts) are mixed and fine-ground by a wet grinding method. In this manner, preparations are obtained.

Preparation Example 19

Each of the pyridazine compounds (1) to (8) (2 parts), sedaxane (8 parts), a mixture of white carbon and polyoxyethylene alkyl ether sulfate ammonium salt (in a weight ratio of 1:1) (35 parts) and water (55 parts) are mixed and fine-ground by a wet grinding method. In this manner, preparations are obtained.

Preparation Example 20

Each of the pyridazine compounds (1) to (8) (2 parts), penflufen (8 parts), a mixture of white carbon and polyoxyethylene alkyl ether sulfate ammonium salt (in a weight ratio of 1:1) (35 parts) and water (55 parts) are mixed and fine-ground by a wet grinding method. In this manner, preparations are obtained

Preparation Example 21

Each of the pyridazine compounds (1) to (8) (2 parts), flutolanil (8 parts), a mixture of white carbon and polyoxyethylene alkyl ether sulfate ammonium salt (in a weight ratio of 1:1) (35 parts) and water (55 parts) are mixed and fine-ground by a wet grinding method. In this manner, preparations are obtained.

Preparation Example 22

Each of the pyridazine compounds (1) to (8) (2 parts), mepronil (8 parts), a mixture of white carbon and polyoxyethylene alkyl ether sulfate ammonium salt (in a weight ratio of 1:1) (35 parts) and water (55 parts) are mixed and fine-ground by a wet grinding method. In this manner, preparations are obtained.

Preparation Example 23

Each of the pyridazine compounds (1) to (8) (2 parts), carboxin (8 parts), a mixture of white carbon and polyoxyethylene alkyl ether sulfate ammonium salt (in a weight ratio of 1:1) (35 parts) and water (55 parts) are mixed and fine-ground by a wet grinding method. In this manner, preparations are obtained.

Preparation Example 24

Each of the pyridazine compounds (1) to (8) (2 parts), thifluzamide (8 parts), a mixture of white carbon and polyoxyethylene alkyl ether sulfate ammonium salt (in a weight ratio of 1:1) (35 parts) and water (55 parts) are mixed and fine-ground by a wet grinding method. In this manner, preparations are obtained.

Preparation Example 25

Each of the pyridazine compounds (1) to (8) (2 parts), penthiopyrad (8 parts), a mixture of white carbon and polyoxyethylene alkyl ether sulfate ammonium salt (in a weight ratio of 1:1) (35 parts) and water (55 parts) are mixed and fine-ground by a wet grinding method. In this manner, preparations are obtained.

Preparation Example 26

Each of the pyridazine compounds (1) to (8) (2 parts), furametpyr (8 parts), a mixture of white carbon and polyoxyethylene alkyl ether sulfate ammonium salt (in a weight ratio of 1:1) (35 parts) and water (55 parts) are mixed and fine-ground by a wet grinding method. In this manner, preparations are obtained.

Preparation Example 27

Each of the pyridazine compounds (1) to (8) (5 parts), bixafen (10 parts), sorbitan trioleate (1.5 parts) and an aqueous solution (28.5 parts) containing polyvinyl alcohol (2 parts) are mixed and fine-ground by a wet grinding method. To the obtained ground product, an aqueous solution (45 parts) containing xanthan gum (0.05 parts) and aluminum magnesium silicate (0.1 parts) is added, and further propylene glycol (10 parts) is added and stirred. In this manner, preparations are obtained.

Preparation Example 28

Each of the pyridazine compounds (1) to (8) (5 parts), isopyrazam (10 parts), sorbitan trioleate (1.5 parts) and an aqueous solution (28.5 parts) containing polyvinyl alcohol (2 parts) are mixed and fine-ground by a wet grinding method. To the obtained ground product, an aqueous solution (45 parts) containing xanthan gum (0.05 parts) and aluminum magnesium silicate (0.1 parts) is added, and further propylene glycol (10 parts) is added and stirred. In this manner, preparations are obtained.

Preparation Example 29

Each of the pyridazine compounds (1) to (8) (5 parts), boscalid (10 parts), sorbitan trioleate (1.5 parts) and an aqueous solution (28.5 parts) containing polyvinyl alcohol (2 parts) are mixed and fine-ground by a wet grinding method. To the obtained ground product, an aqueous solution (45 parts) containing xanthan gum (0.05 parts) and aluminum magnesium silicate (0.1 parts) is added, and further propylene glycol (10 parts) is added and stirred. In this manner, preparations are obtained.

Preparation Example 30

Each of the pyridazine compounds (1) to (8) (5 parts), fluopyram (10 parts), sorbitan trioleate (1.5 parts) and an aqueous solution (28.5 parts) containing polyvinyl alcohol (2 parts) are mixed and fine-ground by a wet grinding method. To the obtained ground product, an aqueous solution (45 parts) containing xanthan gum (0.05 parts) and aluminum magnesium silicate (0.1 parts) is added, and further propylene glycol (10 parts) is added and stirred. In this manner, preparations are obtained.

Preparation Example 31

Each of the pyridazine compounds (1) to (8) (5 parts), fluxapyroxad (10 parts), sorbitan trioleate (1.5 parts) and an aqueous solution (28.5 parts) containing polyvinyl alcohol (2 parts) are mixed and fine-ground by a wet grinding method. To the obtained ground product, an aqueous solution (45 parts) containing xanthan gum (0.05 parts) and aluminum magnesium silicate (0.1 parts) is added, and further propylene glycol (10 parts) is added and stirred. In this manner, preparations are obtained.

Preparation Example 32

Each of the pyridazine compounds (1) to (8) (5 parts), sedaxane (10 parts), sorbitan trioleate (1.5 parts) and an aqueous solution (28.5 parts) containing polyvinyl alcohol (2 parts) are mixed and fine-ground by a wet grinding method. To the obtained ground product, an aqueous solution (45 parts) containing xanthan gum (0.05 parts) and aluminum magnesium silicate (0.1 parts) is added, and further propylene glycol (10 parts) is added and stirred. In this manner, preparations are obtained.

Preparation Example 33

Each of the pyridazine compounds (1) to (8) (5 parts), penflufen (10 parts), sorbitan trioleate (1.5 parts) and an aqueous solution (28.5 parts) containing polyvinyl alcohol (2 parts) are mixed and fine-ground by a wet grinding method. To the obtained ground product, an aqueous solution (45 parts) containing xanthan gum (0.05 parts) and aluminum magnesium silicate (0.1 parts) is added, and further propylene glycol (10 parts) is added and stirred. In this manner, preparations are obtained.

Preparation Example 34

Each of the pyridazine compounds (1) to (8) (5 parts), flutolanil (10 parts), sorbitan trioleate (1.5 parts) and an aqueous solution (28.5 parts) containing polyvinyl alcohol (2 parts) are mixed and fine-ground by a wet grinding method. To the obtained ground product, an aqueous solution (45 parts) containing xanthan gum (0.05 parts) and aluminum magnesium silicate (0.1 parts) is added, and further propylene glycol (10 parts) is added and stirred. In this manner, preparations are obtained.

Preparation Example 35

Each of the pyridazine compounds (1) to (8) (5 parts), mepronil (10 parts), sorbitan trioleate (1.5 parts) and an aqueous solution (28.5 parts) containing polyvinyl alcohol (2 parts) are mixed and fine-ground by a wet grinding method. To the obtained ground product, an aqueous solution (45 parts) containing xanthan gum (0.05 parts) and aluminum magnesium silicate (0.1 parts) is added, and further propylene glycol (10 parts) is added and stirred. In this manner, preparations are obtained.

Preparation Example 36

Each of the pyridazine compounds (1) to (8) (5 parts), carboxin (10 parts), sorbitan trioleate (1.5 parts) and an aqueous solution (28.5 parts) containing polyvinyl alcohol (2 parts) are mixed and fine-ground by a wet grinding method. To the obtained ground product, an aqueous solution (45 parts) containing xanthan gum (0.05 parts) and aluminum magnesium silicate (0.1 parts) is added, and further propylene glycol (10 parts) is added and stirred. In this manner, preparations are obtained.

Preparation Example 37

Each of the pyridazine compounds (1) to (8) (5 parts), thifluzamide (10 parts), sorbitan trioleate (1.5 parts) and an aqueous solution (28.5 parts) containing polyvinyl alcohol (2 parts) are mixed and fine-ground by a wet grinding method. To the obtained ground product, an aqueous solution (45 parts) containing xanthan gum (0.05 parts) and aluminum magnesium silicate (0.1 parts) is added, and further propylene glycol (10 parts) is added and stirred. In this manner, preparations are obtained.

Preparation Example 38

Each of the pyridazine compounds (1) to (8) (5 parts), penthiopyrad (10 parts), sorbitan trioleate (1.5 parts) and an aqueous solution (28.5 parts) containing polyvinyl alcohol (2 parts) are mixed and fine-ground by a wet grinding method. To the obtained ground product, an aqueous solution (45 parts) containing xanthan gum (0.05 parts) and aluminum magnesium silicate (0.1 parts) is added, and further propylene glycol (10 parts) is added and stirred. In this manner, preparations are obtained.

Preparation Example 39

Each of the pyridazine compounds (1) to (8) (5 parts), furametpyr (10 parts), sorbitan trioleate (1.5 parts) and an aqueous solution (28.5 parts) containing polyvinyl alcohol (2 parts) are mixed and fine-ground by a wet grinding method. To the obtained ground product, an aqueous solution (45 parts) containing xanthan gum (0.05 parts) and aluminum magnesium silicate (0.1 parts) is added, and further propylene glycol (10 parts) is added and stirred. In this manner, preparations are obtained.

Preparation Example 40

Each of the pyridazine compounds (1) to (8) (1 part), bixafen (4 parts), synthesized water-containing silicon oxide (1 part), calcium ligninsulfonate (2 parts), bentonite (30 parts) and kaolin clay (62 parts) are ground and mixed well. To this, water is added. The mixture is sufficiently kneaded, granulated and dried. In this manner, preparations are obtained.

Preparation Example 41

Each of the pyridazine compounds (1) to (8) (1 part), isopyrazam (4 parts), synthesized water-containing silicon oxide (1 part), calcium ligninsulfonate (2 parts), bentonite (30 parts) and kaolin clay (62 parts) are ground and mixed well. To this, water is added. The mixture is sufficiently kneaded, granulated and dried. In this manner, preparations are obtained.

Preparation Example 42

Each of the pyridazine compounds (1) to (8) (1 part), boscalid (4 parts), synthesized water-containing silicon oxide (1 part), calcium ligninsulfonate (2 parts), bentonite (30 parts) and kaolin clay (62 parts) are ground and mixed well. To this, water is added. The mixture is sufficiently kneaded, granulated and dried. In this manner, preparations are obtained.

Preparation Example 43

Each of the pyridazine compounds (1) to (8) (1 part), fluopyram (4 parts), synthesized water-containing silicon oxide (1 part), calcium ligninsulfonate (2 parts), bentonite (30 parts) and kaolin clay (62 parts) are ground and mixed well. To this, water is added. The mixture is sufficiently kneaded, granulated and dried. In this manner, preparations are obtained.

Preparation Example 44

Each of the pyridazine compounds (1) to (8) (1 part), fluxapyroxad (4 parts), synthesized water-containing silicon oxide (1 part), calcium ligninsulfonate (2 parts), bentonite (30 parts) and kaolin clay (62 parts) are ground and mixed well. To this, water is added. The mixture is sufficiently kneaded, granulated and dried. In this manner, preparations are obtained

Preparation Example 45

Each of the pyridazine compounds (1) to (8) (1 part), sedaxane (4 parts), synthesized water-containing silicon oxide (1 part), calcium ligninsulfonate (2 parts), bentonite (30 parts) and kaolin clay (62 parts) are ground and mixed well. To this, water is added. The mixture is sufficiently kneaded, granulated and dried. In this manner, preparations are obtained.

Preparation Example 46

Each of the pyridazine compounds (1) to (8) (1 part), penflufen (4 parts), synthesized water-containing silicon oxide (1 part), calcium ligninsulfonate (2 parts), bentonite (30 parts) and kaolin clay (62 parts) are ground and mixed well. To this, water is added. The mixture is sufficiently kneaded, granulated and dried. In this manner, preparations are obtained.

Preparation Example 47

Each of the pyridazine compounds (1) to (8) (1 part), flutolanil (4 parts), synthesized water-containing silicon oxide (1 part), calcium ligninsulfonate (2 parts), bentonite (30 parts) and kaolin clay (62 parts) are ground and mixed well. To this, water is added. The mixture is sufficiently kneaded, granulated and dried. In this manner, preparations are obtained.

Preparation Example 48

Each of the pyridazine compounds (1) to (8) (1 part), mepronil (4 parts), synthesized water-containing silicon oxide (1 part), calcium ligninsulfonate (2 parts), bentonite (30 parts) and kaolin clay (62 parts) are ground and mixed well. To this, water is added. The mixture is sufficiently kneaded, granulated and dried. In this manner, preparations are obtained.

Preparation Example 49

Each of the pyridazine compounds (1) to (8) (1 part), carboxin (4 parts), synthesized water-containing silicon oxide (1 part), calcium ligninsulfonate (2 parts), bentonite (30 parts) and kaolin clay (62 parts) are ground and mixed well. To this, water is added. The mixture is sufficiently kneaded, granulated and dried. In this manner, preparations are obtained.

Preparation Example 50

Each of the pyridazine compounds (1) to (8) (1 part), thifluzamide (4 parts), synthesized water-containing silicon oxide (1 part), calcium ligninsulfonate (2 parts), bentonite (30 parts) and kaolin clay (62 parts) are ground and mixed well. To this, water is added. The mixture is sufficiently kneaded, granulated and dried. In this manner, preparations are obtained.

Preparation Example 51

Each of the pyridazine compounds (1) to (8) (1 part), penthiopyrad (4 parts), synthesized water-containing silicon oxide (1 part), calcium ligninsulfonate (2 parts), bentonite (30 parts) and kaolin clay (62 parts) are ground and mixed well. To this, water is added. The mixture is sufficiently kneaded, granulated and dried. In this manner, preparations are obtained.

Preparation Example 52

Each of the pyridazine compounds (1) to (8) (1 part), furametpyr (4 parts), synthesized water-containing silicon oxide (1 part), calcium ligninsulfonate (2 parts), bentonite (30 parts) and kaolin clay (62 parts) are ground and mixed well. To this, water is added. The mixture is sufficiently kneaded, granulated and dried. In this manner, preparations are obtained.

Preparation Example 53

Preparation Example 54

Each of the pyridazine compounds (1) to (8) (3 parts), isopyrazam (2 parts), kaolin clay (85 parts) and talc (10 parts) are ground and mixed well. In this manner, preparations are obtained.

Next, Experimental Examples will be described.

Experimental Example 1

A plastic pot was charged with soil. To the soil, wheat seeds (cultivar; Apogee) were seeded and grown for 14 days in a greenhouse. A test compound was dissolved in CEC cocktail (cyclohexanone: Sorpol (registered trade mark) 2680X (manufactured by TOHO Chemical Industry Co., Ltd.)=5:1 (volume ratio)) to make a preparation. Thereafter, the preparation was diluted with water up to a predetermined concentration. The diluted solution was sprayed to stem and leaves such that the diluted solution was sufficiently attached to the leaf surfaces of the wheat. After spraying, the plant was air-dried. Two days later, an aqueous suspension (about 1,000,000/mL) containing conidiospores of wheat leaf blotch (Mycosphaerella graminicola) was sprayed to inoculate the spores. After completion of the inoculation, the plant was allowed to leave first in a high-humidity place at 18° C. for 3 days and then the plant was taken out from the high-humidity place and transferred to a thermostatic chamber of 18° C. for 14 days. In this manner, wheat was grown (this is referred to as a treatment district). Thereafter, the lesion area of wheat leaf blotch was checked.

On the other hand, wheat was grown in the same manner as in the treatment district except that a diluted solution of a test compound was not sprayed to stem and leaves (this is referred to as a non-treatment district). The lesion area of wheat leaf blotch was checked in the same manner as in the treatment district.

From the lesion areas of the treatment district and the non-treatment district, the efficacy of the treatment district was obtained in accordance with the following expression (1). The results are shown in [Table 1] to [Table 4].

Experimental Example 2

By use of a rotatory seed processor (seed dresser, manufactured by Hans-Ulrich Hege GmbH), a cyclohexanone solution (100 μL) containing a predetermined weight of a test compound is smeared to wheat (cultivar; Shirogane) seeds (10 g) naturally infected with spores of pink snow mold (Microdochium nivale).

One day after the treatment, a plastic pot is charged with soil and the seeds treated with the test compound are seeded to the soil and grown in a greenhouse made of glass for 20 days (this is referred to as a treatment district). Thereafter, seedlings obtained from individual seeds by budding are observed for onset of pink snow mold and an incidence rate of the disease is obtained in accordance with the following expression (2).

On the other hand, wheat seeds not treated with the smearing treatment mentioned above are grown in the same manner as in the treatment district (this is referred to as a nontreatment district). An incidence rate of the disease is obtained in the same manner as in the treatment district.

As a result, the incidence rate of the seedlings obtained from wheat seeds by budding and treated with the composition of the present invention is lower than that of the seedlings of the non-treatment district.