三种酰胺类新农药对水稻孕穗期稻纵卷叶螟的防效试验

单季杂交晚稻孕穗期稻纵卷叶螟Cnaphalocrocis medinalis Guenée发生不整齐,为害重,在主治药剂氟虫腈即将禁用之际,急需防治高龄幼虫的长效药剂,酰胺类农药是满足这一条件的新一代农药。3种酰胺类农药试验结果,在单季稻孕穗期防治稻纵卷叶螟,20%氟虫双酰胺(WDG)150g/hm2处理速效性与持效性表现最好,药后3d防效达90.3%,药后15d防效高达96.2%;20%氯虫苯甲酰胺(SC)150mL/hm2处理速效性略低于氟虫双酰胺,持效接近,药后3d、15d防效分别达75.2%、91.2%;40%氯虫·噻虫嗪(WDG)120mL/hm2处理速效介于氟虫双酰胺和氯虫苯甲酰胺之间,持效略低于前二者,药后3d、15d防效分别为83.2%、88.3%。对照药剂5%氟虫腈(SC)750mL/hm2和90%杀虫单3000g/hm2处理药后3d、15d的防效均低于上述3种酰胺类新药剂。保叶效果以氯虫苯甲酰胺、氟虫双酰胺处理最高,药后15d保叶率分别为83.6%和85.0%,二者无显著差异,其次为氯虫·噻虫嗪处理为59.6%,3种酰胺类新药剂保叶效果均显著高于对照药剂氟虫腈和杀虫单。结果表明,3种酰胺类农药孕穗期防治稻纵卷叶螟的药效、持效性和保叶效果均高于当前主治药剂氟虫腈、杀虫单,可在生产上推广应用。

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 Guenée,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.