云南省小菜蛾田间种群对氯虫苯甲酰胺的抗药性变化趋势

为掌握云南省不同菜区小菜蛾种群对氯虫苯甲酰胺的抗药性水平及年度变化规律,于2009—2013年间连续5年,采用浸叶法监测了滇中通海县、滇西弥渡县和滇西南临沧市小菜蛾田间种群对氯虫苯甲酰胺的敏感性;同时,对通海小菜蛾田间种群的F1代,测定了磷酸三苯酯(TPP)、增效醚(PBO)和顺丁烯二酸二乙酯(DEM)3种增效剂对氯虫苯甲酰胺的增效作用。结果表明:自2009年以来,通海小菜蛾种群的抗药性水平持续上升,抗性倍数从2009年的2.30倍,逐渐发展到2012年的47.79倍和2013年的43.05倍,达到中等抗性水平;弥渡小菜蛾种群的抗药性水平除了2010年达12.35倍外,其余均处于低水平抗性;临沧市小菜蛾种群的抗药性水平在1.01~4.60倍之间,处于低水平抗性。3种增效剂均对氯虫苯甲酰胺无显著增效作用。

Changing trends of resistance of Plutella xylostella field population to chlorantraniliprole in Yunnan Province

In order to understand the current situation and development of resistance of field population of diamondback moth, Plutella xylostella (L.) to chlorantraniliprole in Yunnan Province, the sensitivity of three diamondback moth population from Tonghai County of central Yunnan, Midu County of west Yunnan and Linxiang district of southwest Yunnan to chlorantraniliprole were determined by the leaf dipping method. Meanwhile, synergism effects of triphenyl phosphate (TPP), piperoayl butoxide(PBO) and diethyl maleate (DEM) to the F1 generation of Tonghai population were tested. The results showed that the resistance levels of Tonghai population of P. xylostella to chlorantraniliprole showed a tendency of going up yearly, with resistance index increased from 2.30 in 2009 to 47.79 in 2012, and to 43.05 in 2013, which reached middle level of resistance; Midu population of P. xylostella showed low level resistance except in 2010 when the resistance index was 12.35; Linxiang population of P. xylostella showed low level of resistance, with resistance index remained between 1.01-4.60 during 2009—2013. t The three compounds had no significant synergistic effects on the toxicity of chlorantraniliprole to P. xylostella.