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An enrichment culture which completely degraded Fluazifop-P-butyl (FpB) was acquired by using FpB as sole carbon source.An efficient FpB-degrading strain FPB-1 was isolated from the enrichment culture and identified as Aquamicrobium sp.Strain FPB-1 could degrade 96.6% of 100 mg l-1 FpB within 4d and the metabolite Fluazifop-P acid (FpA) was identified by HPLC/MS analysis.This strain converted FpB by cleavage of the ester bond,but could not further degrade FpA.