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

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.