新疆北疆马铃薯甲虫成虫对新烟碱类杀虫剂的敏感性变化

采用点滴法于2009和2010年监测了新疆维吾尔自治区北疆马铃薯甲虫Leptinotarsa decemlineata 9个田间种群成虫对新烟碱类杀虫剂吡虫啉、啶虫脒、噻虫嗪和噻虫啉的敏感性变化,发现其对吡虫啉和噻虫嗪的敏感性逐年降低。2009年监测的6个种群中有3个对啶虫脒和噻虫嗪低抗(抗性倍数5.0~10.0);2010年监测的6个种群全部对噻虫嗪产生了抗性,其中中抗(抗性倍数10.1~40.0)和低抗种群各3个。噻虫嗪与高效氯氟氰菊酯可能存在交互抗性。

Susceptibility of Colorado potato beetle Leptinotarsa decemlineata adults from northern Xinjiang Uygur autonomous region to 4 neonicotinoids

Susceptibility of nine field populations of Colorado potato beetle Leptinotarsa decemlineata adults from northern Xinjiang Uygur autonomous region to 4 neonicotinoid insecticides,including imidacloprid,acetamiprid,thiamethoxam and thiacloprid,was evaluated by a topical bioassay in 2009 and 2010.The sensitivity of the pest to imidacloprid and thiamethoxam was reduced yearly.Half of the 6 tested field populations developed low levels of resistance to acetamiprid and thiamethoxam in 2009.All the 6 tested field populations exhibited resistance to thiamethoxam in 2010,among them 3 populations showed low level and the other 3 populations showed moderate level of resistance to thiamethoxam.There may be cross-resistance between thiamethoxam and lambda-cyhalothrin in the pest.