Comparison of Contact Toxicities of 4 Neonicotinoids against Leptinotarsa decemlineata
[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, thiaeloprid 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 acetamipfid 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 ofL. decemlineata.
NETL
NSTL
万方数据
维普
