Fused heterocyclic sulfonylurea compound herbicide containing the same and method of controlling weed with the same

A herbicide for sulfonylurea herbicide-resistant weeds, comprising a compound represented by the formula:

• wherein Q represents a fused heterocyclic group represented by the formulae:
• (wherein R1 represents a hydrogen atom, a halogen atom, a cyano group, a nitro group, an optionally halogenated lower alkyl group, an optionally halogenated lower alkoxy group, a lower alkylthio group, a lower alkylsulfinyl group, a lower alkylsulfonyl group, an amino group, a lower alkylamino group or a di-lower alkylamino group,
• R2 represents a hydrogen atom, a halogen atom or an optionally halogenated lower alkyl group,
• R3 represents a halogen atom, a cyano group, a nitro group, an optionally halogenated lower alkyl group, an optionally halogenated or lower-alkylated lower cycloalkyl group, an optionally halogenated lower alkenyl group, an optionally halogenated lower alkynyl group, an optionally halogenated lower alkoxy group, a lower alkylthio group, a lower alkylsulfinyl group, a lower alkylsulfolnyl group, an amino group, a lower alkylamino group or a di-lower alkylamino group), X and Y are the same or different and each represent an optionally halogenated lower alkyl group, an optionally halogenated lower alkoxy group or a halogen atom, or a salt thereof.