Control effect of three new amide pesticides on rice leaf rolder,Cnaphalocrocis medinalis,at the booting stage of rice

Control effect of three new amide pesticides on rice leaf rolder,Cnaphalocrocis medinalis Guenee,at mid-and late-booting stage of rice in single rice-cropping season were tested in this research.The results indicated that 20% flubendiamide took effect quickly and durably with the best performance and its control efficacy was as high as 90.3% in 3 days and reached 96.2% in 15 days after sprayed with 150g/hm2.The efficacy of 20% chlorantraniliprole was 75.2% in 3 days and 91.2% in 15 days after sprayed with 150mL/hm2.The efficacy of 40% chlorantraniliprole thiamethoxam was 83.2% in 3 days and 88.3% in 15 days with 120mL/hm2.These three new amide pesticides gave better efficacy controlling leaf rolder than the other two pesticides:5% fibroin(750mL/hm2) and 90% Shachongdan(3 000g/hm2).The best leaf protecting effect was obtained with 20% chlorantraniliprole(83.6%) and 20% flubendiamide(85.0%),while it was 59.6% for 40% chlorantraniliprole thiamethoxam.These three new amide pesticides provided significantly higher leaf protecting effect than the two controls in 15 days after sprayed.