Control Effect of Nitenpyram against Nilaparvata lugens in Rice Field

The results of field test demonstrated that Nitenpyram had quick and persistent control effect on Nilaparvata lugens in rice field.The effect of 50% Nitenpyram WSG at the dose of 22.5~52.5 g/hm2 was 84.70%~90.81% on the third day after spraying;and the effect of 50% Nitenpyram WSG at the dose of 37.5~52.5 g/hm2 was still 89.84%~96.06% from the 14th day to the 21st day after application.So the suitable dosage of 50% Nitenpyram WSG for the control of Nilaparvata lugens in rice field should be 37.5~52.5 g/hm2 based on the control effect and control cost.