3,4-dihalogenoisothiazole derivative, and agricultural or horticultural plant disease-controlling agent

1. A 3,4-dihalogenoisothiazole derivative represented by the general formula [I]

[wherein X 1 and X 2 are each a halogen atom;

A is an oxygen atom or a sulfur atom; and

R is a phenyl group (the group may be mono- or poly-substituted by same or different substituents selected from the following substituents group α), or a 5- to 10-membered heterocyclic group containing at least one of oxygen atom, sulfur atom and nitrogen atom (the group may be mono- or poly-substituted by same or different substituents selected from group α, or a salt thereof; wherein group a consists of:

C 1 -C 6 alkyl group, C 3 -C 6 cycloalkyl group, C 1 -C 6 haloalkyl group, phenyl group, halogen atom, cyano group, C 1 -C 6 acyl group, carboxyl group, C 1 -C 6 alkoxycarbonyl group, mono(C 1 -C 6 alkyl)carbamoyl group, di(C 1 -C 6 alkyl)carbamoyl group, amino group, mono(C 1 -C 6 alkyl)amino group, di(C 1 -C 6 alkyl)amino group, C 1 -C 6 alkylamide group, C 1 -C 6 alkylsulfonamide group, nitro group, hydroxyl group, C 1 -C 6 alkoxy group, C 1 -C 6 acyloxy group, C 1 -C 6 alkylsulfonyl group, mono(C 1 -C 6 alkyl)sulfamoyl group, and di(C 1 -C 6 alkyl)sulfamoyl group.

2. A 3,4-dihalogenoisothiazole derivative or a salt thereof, according to claim 1 , wherein R is a 5- to 10-membered heterocyclic group selected from the group consisting of pyrrole, furan, thiophene, oxazole, thiazole, imidazole, isoxazole, isothiazole, pyrazole, oxadiazole, thiadiazole, triazole, indole, benzofuran, benzothiophene, benzoxazole, benzothiazole, benzoimidazole, benzoisoxazole, benzoisothiazole, indazole, benzoxadiazole, benzothiadiazole, and benzotriazole, wherein the heterocyclic group is optionally mono- or poly-substituted by the same or different substituents selected from group α.

3. A 3,4-dihalogenoisothiazole derivative or a salt thereof, according to claim 1 , wherein R is a phenyl group (the group may be substituted by same or different, 1 to 5 substituents selected from the group consisting of C 1 -C 6 alkyl group, halogen atom, cyano group, C 1 -C 6 alkoxycarbonyl group, nitro group, C 1 -C 6 alkoxy group and C 1 -C 6 alkylsulfonyl group), pyridine (the group may be substituted by same or different, 1 to 4 substituents selected from the group consisting of C 1 -C 6 alkyl group and halogen atom), isothiazole (the group may be substituted by same or different, 1 to 2 substituents selected from the group consisting of C 1 -C 6 alkyl group and halogen atom), or benzothiadiazole (the group may be substituted by same or different, 1 to 3 substituents selected from the group consisting of C 1 -C 6 alkyl group and halogen atom).

4. An agricultural or horticultural plant disease-controlling agent containing, as an active ingredient, a 3,4-dihalogenoisothiazole derivative or a salt thereof, according to claim 1 .

5. A 3,4-dihalogenoisothiazole derivative or a salt thereof, according to claim 1 , wherein R is a phenyl group (the group may be substituted by same or different, 1 to 5 substituents selected from the group consisting of C 1 -C 6 alkyl group, halogen atom, cyano group, C 1 -C 6 alkoxycarbonyl group, nitro group, C 1 -C 6 alkoxy group and C 1 -C 6 alkylsulfonyl group), pyridine (the group may be substituted by same or different, 1 to 4 substituents selected from the group consisting of C 1 -C 6 alkyl group and halogen atom, isothiazole (the group may be substituted by same or different, 1 to 2 substituents selected from the group consisting of C 1 -C 6 alkyl group and halogen atom), and benzothiadiazole (the group may be substituted by same or different, 1 to 3 substituents selected from the group consisting of C 1 -C 6 alkyl group and halogen atom).

6. An agricultural or horticultural plant disease-controlling agent containing, as an active ingredient, a 3,4-dihalogenoisothiazole derivative or a salt thereof, according to claim 5 .