Abstract:
【Objective】 This research aims to evaluate the effectiveness of reduced pesticides application and adjuvant addition in the control of wheat aphids in jujube-wheat intercropping, and to provide a theoretical basis for the scientific use and dosage reduction of pesticides to control the desease.
【Methods】 A randomized block design was used to conduct a fixed plant survey‘Jijian’ to verify the effects of different reduction proportions of five commonly used pesticides and adjuvant addition on the control effect of wheat aphids in jujube-wheat intercropping system.
【Results】 7 d after pesticides application, the control effects against wheat aphids of 20%-40% reduction dosage treatments of 22% thiamethoxam-lambda-cyhalothrin SC, 22% sulfoxaflor SC and 70% thiamethoxam WG were 91.88%-94.22%, 89.30%-94.11% and 80.08%-83.82%, respectively, which had no significant difference compared to the corresponding regular dosage treatment. The control effect of 20%-40% reduction dosage treatments within adjuvant ‘Jijian’ against wheat aphids were not significantly improved compared with the treatments without any adjuvants.
【Conclusion】 If pursuing a relative higher control effects within 7 d, 40% reduction dosages of 22% thiamethoxam-lambda-cyhalothrin SC, 22% sulfoxaflor SC and 70% thiamethoxam WG can be chosen to spray manually. To maintain a better control effect within 14 d, 20%-40% reduction dosages of tested five pesticides can achieve the purpose. When manually spraying pesticides to control wheat aphids in jujube-wheat intercropping fields in South Xinjiang, adjuvant ‘Jijian’ adding is not necessary.