2005年晚稻后期稻飞虱暴发与抗药性原因分析

Causes of breaking out and resistant to pesticides of planthopper in late rice at late stage

2005年．全国稻作区晚稻大范围暴发稻飞虱危害，广西宾阳县农作物病虫测报站灯下累计第七代稻飞虱成虫量平均21741头，与上年同期的264头、最高发生年份的735头、8年累计的208．6头相比，分别高出21477头、21006头、21532．4头。短翅型成虫：第七代798头，与上年同期的7头、最高年份10头、8年累计4．6头相比，分别高出791只、788只、793．4只。暴发原因除气候、品种因素外，主因是十几年来一直使用以吡虫啉、噻嗪酮为主药防治稻飞虱，产生高抗药性所致。进行稻飞虱对吡虫啉（irnidacloprid）、噻嗪酮（buprofezin）药效检测，防治效果在30％～50％，抗药性敏感比1994年增加202倍。

The breaking out of planthopper in late rice happened in rice region of all over the Binyang Country in 2005, and the occurrence amount of planthopper was investigated by Binyang Crop Diseases and Pests Monitoring Station in Guangxi. The results showed that the average amount of Fzadult of planthopper was 21741, as com- pared with 264 at the same term in the previous year, 735 in the highest year and 208. 6 of the total for eight years, which increased by 21477, 21066 and 21532. 4, respectively. The total of Fzshort wing adult was 798, and as compared with 7 in the previous year, 10 in the highest year and 4. 6 of the total of eight years, which increased by 791, 788 and 793.4, respectively. The cause of increase in amount of planthopper was not only related to the climate and rice variety, but also the application of imidacloprid and buprofezin over ten years, which led to high resistance of the insect pest. The effects of imidacloprid and buprofezin on planthopper were determined and it found that the control effect was 30%-50%, the sensitivity of resistance to the chemicals had been increased 203 times as against in 1994.