不同地区小菜蛾对氯虫苯甲酰胺的抗药性差异

为合理使用新型杀虫剂氯虫苯甲酰胺,2011-2013年采用浸叶法,监测了广东连州、惠州、番禺、石井和广西柳州5个小菜蛾田间种群对氯虫苯甲酰胺的抗药性。监测结果表明,与敏感基线(LC50=0.23mg/L))相比,2011年上半年,各监测点小菜蛾均处于敏感水平。2012年下半年和2013年下半年,各监测点小菜蛾均处于中、高水平抗性,抗性倍数为16~506倍。总体上小菜蛾抗药性水平下半年高于上半年。分析认为过度依赖该药,随意提高施用剂量,不合理混配等是导致小菜蛾对氯虫苯甲酰胺迅速产生抗药性的主要原因。

Resistance of diamondback moth to chlorantraniliprole in different areas

The resistance to chlorantraniliprole of diamondback moth (DBM) collected from five different fields in South China was detected by leaf dipping method from 2011-2013 in South China. The five different fields were Lianzhou, Huizhou, Panyu and Shijing in Guangdong Province and Liuzhou in Guangxi Province. The results showed that all of the field populations were susceptible in the first half of 2011 compared with susceptible toxicity baseline (LC50=0.23 mg/mL). All of the field populations were middle or high resistance in the second half of 2012 and 2013 compared with susceptible toxicity baseline (LC50=0.23 mg/mL). The resistance ratios were 16~506. The resistance of DBM was higher in autumn than in spring. Over dependency on chlorantraniliprole, over dose and unreasonable mixing may be the main reasons leading to the resistance of the DBM.