Abstract:

A scientific and reasonable application technology is very important to increase control efficacy and reduce usage volume of pesticide. Field experiments were conducted to control rice leaf-roller, Cnaphalocrocis medinalis and striped stem borer, Chilo suppressalis with 40% chlorantraniliprole·thiamethoxam WG in 2009. The results showed that perfect control and excellent persistent effect of two rice stem borers could be achieved with above insecticide. When same doses of 40%chlorantraniliprole·thiamethoxam WG were applied, first of all, control efficacy was extremely affected by nozzle and usage volume of water within 7 d after treatment. Furthermore, during the period of another 7 d, the impact of sprayer and usage volume of water were significant for it. Lastly, there was not obvious on influence of usage volume of water, dosage and adjuvant at the end of 21 d after treatment. However, when 40% chlorantraniliprole·thiamethoxam WG was used to control C. medinalis and C. suppressalis through same sprayer and nozzle types, the role of these three effectors on effectiveness was decreased in turn.