褐飞虱对噻虫嗪和烯啶虫胺的抗性风险评估

Resistance risk assessment to thiamethoxam and nitenpyram for nilaparvata lugens Stl

采用稻茎浸渍法,测定了广州市本地褐飞虱种群对噻虫嗪和烯啶虫胺的室内毒力,评估褐飞虱对其的抗性风险。结果表明:广州本地褐飞虱种群对噻虫嗪和烯啶虫胺的LC50分别为0.2857mg/L和0.5022mg/L,分别是敏感品系LC50的2.67倍和1.06倍,仍属敏感水平。室内抗性筛选结果表明:经过30代的连续筛选后,噻虫嗪的抗性上升829.80倍,达到极高抗性水平,烯啶虫胺的抗性上升31.70倍,达到中等抗性水平,表明褐飞虱对噻虫嗪和烯啶虫胺存在抗性风险的可能。根据试验结果,对褐飞虱噻虫嗪和烯啶虫胺抗性的预防治理提出了应用策略。

The Toxicities of thiamethoxam and nitenpyram of field PoPulations of Nilaparvata lugens Stal, which were collected from Guangzhou District, Guangdong, were carried by the rice stem dipping method. The results showed that the LC50 were 0. 2857 mg/L and 0. 5022 rag/L, and field populations were susceptible level, the resistance ratio were 2.67 and 1.06. To assess the resistance risk of thiamethoxam and nitenpyram, continuously selected was carried in laboratory. The results showed that the resistance ratio of thiamethoxam increased by 829. 80 fold and was extremely high resistance level after 30 generations, and nitenpyram increased by 31.70 fold and was mid - resistance leve. The result showed that continuous selection with thiamethoxam and nitenpyram could further increase the resistance risk.