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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。
In this study, the indoor toxicity of thiamethoxam and nitenpyram in local population of Nilaparvata lugens in Guangzhou City was determined by rice stem dipping method, and the risk of Nilaparvata lugens against it was evaluated. The results showed that the LC50 values of native BPH population to thiamethoxam and nitenpyram in Guangzhou were 0.2857mg / L and 0.5022mg / L, respectively, which were 2.67 times and 1.06 times that of the sensitive strain LC50, respectively, which were still sensitive. The results of indoor resistance screening showed that after 30 generations of continuous screening, the resistance of thiamethoxam rose 829.80 times and reached extremely high resistance level, the resistance of nitenpyram increased by 31.70 times and reached the level of medium resistance, indicating that Nilaparvata lugens may be resistant to thiamethoxam and nitenpyram. According to the test results, the application strategies for the prophylaxis and treatment of BPH and nitenpyram were proposed.