The Biological Activity and Control Effect in Field of Silafluofen to Nilaparvata lugens

The result of the biological activity showed that the LC50 of silafluofen against the 3rd larval of Nilaparvata lugens were 9.98 mg/L,which was 14.14 times than that of pymetrozine. The results of field test demonstrated that silafluofen had favorable quick-acting and persistent effects for controlling Nilaparvata lugens. The effect of silafluofen 5% EC at the dose of 1500-4500 mL/ha was 76.39-94.00% after 3 days,and still 73.88-89.22% after 21 days at the dose of 3000-4500 mL/ha. So silafluofen 5% EC at the dose of 3000-4500 mL/ha is recommended for controlling Nilaparvata lugens from control effect and economic point of view.