双丙环虫酯对枸杞蚜虫的田间防效及异色瓢虫的安全性OA

To determine the control efficacy of 50 g/L afidopyropen to Aphis gossypii Glover and its safer for Harmonia axyridis,and to provide a theoretical basis for rotating pesticides to reduce the drug resistance of Aphis gossypii Glover and its impact on Harmonia axyridis.Using 5％imidacloprid and 5％abamectin as control agents,the control efficacy of the three agents on Aphis gossypii Glover and their toxic effects on the larvae of Harmonia axyridis were determined in the field.The results showed that,on the first day after spraying,there was no significant difference in the control efficacy between the 50 g/L afidopyropen DC at 5,000 times and 10,000 times,5％imidacloprid EC at 1,500 times,and 5％abamectin EC at 7,500 times.On the 10th day after spraying,there was no significant difference in the control efficacy between the three doses of 50 g/L afidopyropen DC,but all of them was significantly higher than the treatment of imidacloprid and abamectin.There was no significant difference in the corrected population reduction rate of Harmonia axyridis larvae between the 50 g/L afidopyropen DC at 10,000 times and 15,000 times,and 5％imidacloprid EC at 1,500 times,and the blank control.They all showed a high level of safety towards the Harmonia axyridis,and their safety was higher than that of 50 g/L afidopyropen DC at 5,000 times and 5％abamectin EC at 7,500 times.The control efficacy of the afidopyropen on Aphis gossypii Glover was the best,it showed excellent rapid and lasting efficacy.Imidacloprid can be used during the aphid outbreak period because it has good quick-acting characteristics.Abamectin can be used in the early stage of aphid occurrence because it has long-lasting effect.Afidopyropen can be used in both periods.According to the developmental stage of Harmonia axyridis,apply high doses of afidopyropen or avermectins from the budding to the early flowering stage of wolfberry,which are relatively safe for the adult and eggs of the Harmonia axyridis,apply low doses of imidacloprid or medium to low-dose afidopyropen from the full flowering stage to the fruit picking stage,which have lower toxicity to the of the Harmonia axyridis larvae.And pay attention to the alternating and rotational use of the pesticides.