广西不同白背飞虱种群对杀虫剂的敏感性测定

Determination on susceptibility of different Sogatella furcifera populations to insecticides in different areas of Guangxi

用稻茎浸渍法测定了广西不同白背飞虱种群对4种杀虫剂的敏感性。结果表明,不同白背飞虱种群对噻虫嗪的敏感性最高,LC50值在0.0526～0.3161mg a.i./L之间;对吡虫啉也有较高的敏感性,LC50值在0.0932～0.7646mg a.i./L之间;对噻嗪酮和氟虫腈的敏感性相对较低,LC50值在0.1951～2.7259mg a.i./L之间。不同白背飞虱种群对同一种杀虫剂的敏感性差异很大,对氟虫腈和吡虫啉的敏感性差异超过8倍,对噻嗪酮和噻虫嗪的敏感性差异达5～6倍。

The susceptibility of Sogatella furcifera populations collected from different areas of Guangxi to four insecticides were monitored by rice-stem dipping method. The result showed that different populations of Sogatella furcifera had the highest susceptibility to thiamethoxam for which the LC50 ranged from 0.0526 to 0.3161mg a.i./L. Different populations had higher susceptibility to imidacloprid for which the LC50 ranged from 0.0932 to 0.7646 mg a.i./L. However, they had lower susceptibility to buprofezin and fipronil （LC50 ranged from 0.1951 to 2.7259 mg a.i./L）. Further, different populations of Sogatella furcifera had significant difference in susceptibility to same insecticide, and the difference in susceptibilities of six populations to fipronil and imidacloprid were over 8 times, and that to buprofezin and thiamethoxam were over 5-6 times.