Abstract: Citrus psylla (Diaphorina citri ) has become the most important pest in Huanglongbing(HLB) areas.Up to now, the assay was yet not reported. By means of dipping,the laboratory toxicity of 6 pesticides to adult psylla were conducted out in 2008. The LC50 of carbosulfan,phenthoate,bifenthrin,imidacloprid,quinalphos,Pirimiphos -methyl was 4.1mg/kg,44.3mg/kg,44.4mg/kg,60.1 mg/kg,73.5mg/kg,192.8mg/kg,respectively. After treating of 24h,3d and 7d, the adult psyllid field control efficiency of bifenthrin plus azone 12.5mg(a.i)/kg was all 100%. the adult psyllid control efficiency of phenthoate 333mg(a.i)/kg,quinalphos 250mg(a.i)/kg,carbosulfan plus azone 200(a.i)/kg was all over than 95% , while that of pirimiphos-methyl 500 mg(a.i)/kg less 80%. the adult psyllid field control efficiency of carbosulfan plus azone 200(a.i)/kg was better than that of carbosulfan 250(a.i)/kg. Key words: Asian citrus psylla (Diaphorina citri ), 6 pesticides, Toxicity ,Field experiments