【摘要】 [目的]马铃薯甲虫已在北疆为害近20年,多年的化学防治使其对常规农药产生了抗药性,寻找替代农药品种变得十分迫切与必要。[方法]采用点滴法于2009、2010年测定了4种新烟碱类杀虫剂对新疆北疆6县市马铃薯甲虫4龄幼虫的触杀毒力。[结果]4种新烟碱类杀虫剂对这些田间种群均具有很好的毒杀效果,吡虫啉、噻虫嗪、噻虫啉和啶虫脒相对毒力比为1∶0.87∶1.90∶7.20,其中啶虫脒的毒力最强而噻虫嗪最弱。[结论]4种新烟碱类农药对马铃薯甲虫4龄幼虫触杀毒力的差异与其田间种群对常规农药的抗性无关,可用于马铃薯甲虫防治及抗药性治理。更多还原

【Abstract】 [Aims]Colorado potato beetle,Leptinotarsa decemlineata(Say) has often caused serious damage to potato through most of northern Xinjiang for nearly two decades.Since this pest has developed insecticide resistance to some conventional pesticides,it is urgent and necessary to search for new insecticides.[Methods] Contact toxicities of 4 neonicotinoids,namely imidacloprid,thiamethoxam,thiacloprid and acetamiprid,on 6 field populations of L.decemlineata 4th-instar larvae in northern Xinjiang Uygur autonomous region were evaluated by a topical bioassay in 2009 and 2010.[Results] The 4 neonicotinoids showed excellent activity against L.decemlineata 4th-instar larvae.The toxic ratio of imidacloprid,thiamethoxam,thiacloprid and acetamiprid was 1∶0.87∶1.90∶7.20.The most active commerciallized compound was acetamiprid and the least toxic one was thiamethoxam.[Conclusions] Moreover,differences in contact toxicities of the 4 neonicotinoids among field populations were not correlated with resistances to conventional insecticides.The 4 neonicotinoids can be used in the field for controlling and resistance management of L.decemlineata.更多还原