The present invention belongs to the technical field of pesticides, and in particular relates to a pyridazinol compound, a derivative thereof, a preparation method therefor, a herbicidal composition and the use thereof. The pyridazinol compound is as represented by general formula I,

##STR00001##

wherein X represents

##STR00002##

and the ring is an unsubstituted or substituted aryl or unsubstituted or substituted heterocyclyl containing a carbon atom at the 1-position; Y represents haloalkyl; and Z represents halogen, cyano, hydroxy, etc. The derivative refers to an agriculturally acceptable derivative of the hydroxyl group at the 4-position of the pyridazine ring in the general formula I, including a salt, an ester, an oxime, a hydroxylamine and an ether derivative, etc. The compound, the derivative thereof and the composition thereof have good herbicidal activity and crop safety.

Disclosed are compounds of Formula (1) including all geometric and stereoisomers, N-oxides, and salts thereof, wherein W, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 m, n and p are as defined in the disclosure. Also disclosed are compositions containing the compounds of Formula (1) and methods for controlling plant disease caused by a fungal pathogen comprising applying an effective amount of a compound or a composition of the invention.

##STR00001##

Disclosed are compounds of Formula (1) including all geometric and stereoisomers, N-oxides, and salts thereof, wherein W, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 m, n and p are as defined in the disclosure. Also disclosed are compositions containing the compounds of Formula (1) and methods for controlling plant disease caused by a fungal pathogen comprising applying an effective amount of a compound or a composition of the invention.

##STR00001##

Disclosed are compounds of Formula (1) including all geometric and stereoisomers, N-oxides, and salts thereof, wherein W, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 m, n and p are as defined in the disclosure. Also disclosed are compositions containing the compounds of Formula (1) and methods for controlling plant disease caused by a fungal pathogen comprising applying an effective amount of a compound or a composition of the invention.

##STR00001##

The present invention relates to a compound selected from formula (I) and a process for preparing the same

##STR00001##

wherein, R.sup.2, R.sup.3, A, Hy, K, n, m, X.sup.1, and W.sup.1 are as defined in the description.
The invention also relates to the combination and composition comprising the compound of formula (I).

The present invention relates to a compound selected from formula (I) and a process for preparing the same

##STR00001##

wherein, R.sup.2, R.sup.3, A, Hy, K, n, m, X.sup.1, and W.sup.1 are as defined in the description.
The invention also relates to the combination and composition comprising the compound of formula (I).

There is provided an agricultural chemical (in particular, a herbicide). A pyridazinone compound of the following Formula (1):

##STR00001##

[wherein W.sup.1 and X are each independently an oxygen atom or a sulfur atom; R.sup.1 and R.sup.2 are each independently such as C.sub.1-6 alkyl; R.sup.3 is such as D-1 to D-8; Y.sup.1 is such as a halogen atom; G is such as a hydrogen atom; Z.sup.1 is such as C.sub.1-6 alkyl; n is an integer of 0, 1, 2, 3, or 4; p5 is an integer of 0, 1, 2, 3, 4, or 5; p4 is an integer of 0, 1, 2, 3, or 4; and p3 is an integer of 0, 1, 2, or 3] and a herbicide including the same.

There is provided an agricultural chemical (in particular, a herbicide). A pyridazinone compound of the following Formula (1):

##STR00001##

[wherein W.sup.1 and X are each independently an oxygen atom or a sulfur atom; R.sup.1 and R.sup.2 are each independently such as C.sub.1-6 alkyl; R.sup.3 is such as D-1 to D-8; Y.sup.1 is such as a halogen atom; G is such as a hydrogen atom; Z.sup.1 is such as C.sub.1-6 alkyl; n is an integer of 0, 1, 2, 3, or 4; p5 is an integer of 0, 1, 2, 3, 4, or 5; p4 is an integer of 0, 1, 2, 3, or 4; and p3 is an integer of 0, 1, 2, or 3] and a herbicide including the same.

The present invention provides a composition having excellent control efficacy against plant diseases and a method for controlling plant diseases. A composition for controlling a plant disease comprising a compound represented by formula (I)

##STR00001##

[wherein each symbol represents the same definition as described in the present description] and one or more mitochondrial electron transport system complex II inhibitor(s) selected from Group B has excellent control effects on plant diseases;
Group B: a group consisting of fluxapyroxad, benzovindiflupyr, fluindapyr, pydiflumetofen, 3-(difluoromethyl)-N-(2,3-dihydro-1,1,3-trimethyl-1H-inden-4-yl)-1-methyl-1H-pyrazole-4-carboxamide, a compound represented by formula (1), a compound represented by formula (2), and a compound represented by formula (3)

##STR00002##

The present invention provides a composition having excellent control efficacy against plant diseases and a method for controlling plant diseases. A composition for controlling a plant disease comprising a compound represented by formula (I)

##STR00001##

[wherein each symbol represents the same definition as described in the present description] and one or more mitochondrial electron transport system complex II inhibitor(s) selected from Group B has excellent control effects on plant diseases;
Group B: a group consisting of fluxapyroxad, benzovindiflupyr, fluindapyr, pydiflumetofen, 3-(difluoromethyl)-N-(2,3-dihydro-1,1,3-trimethyl-1H-inden-4-yl)-1-methyl-1H-pyrazole-4-carboxamide, a compound represented by formula (1), a compound represented by formula (2), and a compound represented by formula (3)

##STR00002##