Pyridazinone compound and use thereof as herbicides

A pyridazinone compound represented by the formula (I)

• wherein in formula, R1 represents a C1-6 alkyl group or a (C1-6 alkyloxy) C1-6 alkyl group,
• R2 represents a hydrogen atom,
• G represents a hydrogen atom, a group represented by formula,
• a group represented by formula,
• or a group represented by formula,
• (wherein in formula, L represents an oxygen or a sulfur atom,
• R3 represents a C1-6 alkyl group, a C3-8 cycloalkyl group, a C2-6 alkenyl group, a C2-6 alkynyl group, a C6-10 aryl group, a (C6-10 aryl) C1-6 alkyl group, a C1-6 alkyloxy group, a C3-8 cycloalkyloxy group, a C2-6 alkenyloxy group, a C2-6 alkynyloxy group, a C6-10 aryloxy group, a (C6-10 aryl) C1-6 alkyloxy group, an amino group, a C1-6 alkylamino group, a C2-6 alkenylamino group, a C6-10 arylamino group, di(C1-4 alkyl)amino group, di(C2-6 alkenyl)amino group, a (C1-6 alkyl) (C6-10 aryl)amino group or a three- to eight-membered nitrogen containing heterocyclic ring group,
• R4 represents a C1-6 alkyl group, a C6-10 aryl group, a C1-6 alkylamino group or di(C1-6 alkyl)amino group and
• R5 and R6 may be same or different and represent a C1-6 alkyl group, a C3-8 cycloalkyl group, a C2-6 alkenyl group, a C6-10 aryl group, a C1-6 alkyloxy group, a C3-8 cycloalkyloxy group, a C6-10 aryloxy group, a (C6-10 aryl) C1-6 alkyloxy group, a C1-6 alkylthio group, C1-6 alkylamino group or di(C1-6 alkyl)amino group, here, any group represented by R3, R4, R5 and R6 may be substituted with at least one halogen atom and a C3-8 cycloalkyl group, a C6-10 aryl group, an aryl moiety of a (C6-10 aryl) C1-6 alkyl group, a C3-8 cycloalkyloxy group, a C6-10 aryloxy group, an aryl moiety of a (C6-10 aryl) C1-6 alkyloxy group, an aryl moiety of a C6-10 arylamino group, an aryl moiety of a (C1-6 alkyl)(C6-10 aryl)amino group and a three- to eight-membered nitrogen containing heterocyclic ring group may be substituted with at least one C1-6 alkyl group),
• Z1 represents a C1-6 alkyl group,
• Z2 represents a C1-6 alkyl group, n represents 0, 1, 2, 3 or 4 and each of Z2 may be same or different when n represents an integer of 2 or more,
• and a sum of the number of carbon atoms in the group represented by Z1 and that in the group represented by Z2 is equal to 2 or more.