Comparison of Field Trial of Several Pesticides against Aphis gossypii

[Aims] The field efficacy trial was conducted to confirm the control effect of imidacloprid 200 g/l sl,carbosulfan 200 g/l ec and pymetrozine 50% Wg on Aphis gossypii.[Results] The results showed that the efficacy of imidacloprid 200 g/L SL,carbosulfan 200 g/L EC and pymetrozine 50% Wg with dosages of 15-45,90-180 and 60-90 g a.i./ha respectively were 82.31-92.02,77.23-95.31 and 76.67-91.11% against Aphis gossypii on the first day after spraying treatment,the efficacy were 86.30-96.71,86.83-96.53 and 94.87-98.73% respectively on the seventh day.[Conclusions] Persistence period of both of imidacloprid 200 g/l sl and pymetrozine 50% Wg reach over 7 days,carbosulfan 200 g/l ec has good readily availability.The usage of imidacloprid 200 g/l sl,carbosulfan 200 g/l ec and pymetrozine 50% Wg with 30-45,135-180 and 60-75 g a.i./ha are recommended respectively.