The present invention provides novel inhibitors of cystathionin gamma synthase (CGS), their use as selective and non-selective herbicides, agricultural and non-agricultural herbicides, herbicides in integrated pest management, herbicides for gardening, clearing waste ground, clearing industrial or constructions sites, clearing railways and railway embankments, pesticide, fungicide, agricultural plant stimulant or antimicrobial agent. Also provided is a method for the control of undesired vegetation or clearing areas from the undesired vegetation comprising applying to the locus of said undesired vegetation, to the undesired plants or to a habitat thereof, a herbicidally effective amount of the compound of the present invention.

The present invention relates to herbicidally active pyridazine derivatives of Formula (I) as defined herein, as well as to herbicidal compositions comprising such derivatives, and the use of such compounds and compositions for controlling undesirable plant growth: in particular the use for controlling weeds, in crops of useful plants.

##STR00001##

Compounds of the Formula (I) wherein the substituents are as defined in claim 1. The invention further relates to herbicidal compositions which comprise a compound of Formula (I) and to the use of compounds of Formula (I) for controlling weeds, in particular in crops of useful plants.

##STR00001##

Compounds of the Formula (I) wherein the substituents are as defined in claim 1. The invention further relates to herbicidal compositions which comprise a compound of Formula (I) and to the use of compounds of Formula (I) for controlling weeds, in particular in crops of useful plants.

##STR00001##

Compounds of the formula (I), wherein the substituents are as defined in claim 1, useful as a pesticides, especially as fungicides.

##STR00001##

Compounds of the formula (I), wherein the substituents are as defined in claim 1, useful as a pesticides, especially as fungicides.

##STR00001##

A compound represented by Formula (I), or a salt or N-oxide compound thereof is provided.

##STR00001##

In Formula (I), A.sup.1 to A.sup.4 each independently represents a carbon atom or nitrogen atom, X.sup.1 represents a C1-6 alkyl group or the like, n represents the number of X.sup.1 groups, R.sup.1 represents a C1-6 alkylthio group or the like, and D is a group represented by Formula (D-1) or (D-2), and

##STR00002##

in Formula (D-1) and (D-2), * represents a binding position, Q represents a C1-6 alkyl group or the like, B.sup.1 and B.sup.2 each independently represents a nitrogen atom or the like, R.sup.2 represents a C1-6 alkyl group or the like that is bound to one of the nitrogen atoms in Formula (D-1), B.sup.3 and B.sup.4 each independently represents a nitrogen atom or carbon atom, R.sup.4 represents a C1-6 alkyl group or the like, and m represents the number of R.sup.4 groups.

A compound represented by Formula (I), or a salt or N-oxide compound thereof is provided.

##STR00001##

In Formula (I), A.sup.1 to A.sup.4 each independently represents a carbon atom or nitrogen atom, X.sup.1 represents a C1-6 alkyl group or the like, n represents the number of X.sup.1 groups, R.sup.1 represents a C1-6 alkylthio group or the like, and D is a group represented by Formula (D-1) or (D-2), and

##STR00002##

in Formula (D-1) and (D-2), * represents a binding position, Q represents a C1-6 alkyl group or the like, B.sup.1 and B.sup.2 each independently represents a nitrogen atom or the like, R.sup.2 represents a C1-6 alkyl group or the like that is bound to one of the nitrogen atoms in Formula (D-1), B.sup.3 and B.sup.4 each independently represents a nitrogen atom or carbon atom, R.sup.4 represents a C1-6 alkyl group or the like, and m represents the number of R.sup.4 groups.

A compound represented by Formula (I), or a salt or N-oxide compound thereof is provided. ##STR00001## In Formula (I), A.sup.1 to A.sup.4 each independently represents a carbon atom or nitrogen atom, X.sup.1 represents a C1-6 alkyl group or the like, n represents the number of X.sup.1 groups, R.sup.1 represents a C1-6 alkylthio group or the like, and D is a group represented by Formula (D-1) or (D-2), and ##STR00002## in Formula (D-1) and (D-2), * represents a binding position, Q represents a C1-6 alkyl group or the like, B.sup.1 and B.sup.2 each independently represents a nitrogen atom or the like, R.sup.2 represents a C1-6 alkyl group or the like that is bound to one of the nitrogen atoms in Formula (D-1), B.sup.3 and B.sup.4 each independently represents a nitrogen atom or carbon atom, R.sup.4 represents a C1-6 alkyl group or the like, and m represents the number of R.sup.4 groups.

A compound represented by Formula (I), or a salt or N-oxide compound thereof is provided. ##STR00001## In Formula (I), A.sup.1 to A.sup.4 each independently represents a carbon atom or nitrogen atom, X.sup.1 represents a C1-6 alkyl group or the like, n represents the number of X.sup.1 groups, R.sup.1 represents a C1-6 alkylthio group or the like, and D is a group represented by Formula (D-1) or (D-2), and ##STR00002## in Formula (D-1) and (D-2), * represents a binding position, Q represents a C1-6 alkyl group or the like, B.sup.1 and B.sup.2 each independently represents a nitrogen atom or the like, R.sup.2 represents a C1-6 alkyl group or the like that is bound to one of the nitrogen atoms in Formula (D-1), B.sup.3 and B.sup.4 each independently represents a nitrogen atom or carbon atom, R.sup.4 represents a C1-6 alkyl group or the like, and m represents the number of R.sup.4 groups.