取食不同寄主植物的二个甜菜夜蛾品系对药剂的敏感性

探讨取食不同寄主植物的2种甜菜夜蛾Spodoptera exigua(Hübner)品系对几种常用药剂的敏感性变化情况。试验结果表明,寄主植物对甜菜夜蛾的生长发育和杀虫剂的敏感性有显著影响,取食不同寄主植物以后,甜菜夜蛾2个品系对溴氰菊酯、毒死蜱、溴虫腈、虫酰肼的敏感性均有不同程度的变化,取食不同寄主植物的甜菜夜蛾蛹黑突变品系较甜菜夜蛾正常品系的抗性均要高,2个品系对溴氰菊酯的敏感性变化均较大,最大LD50之比分别达到13.36、12.30倍,2个品系都对虫酰肼的敏感性变化不明显,最大LD50之比分别达到2.54、2.23倍。

The variation of sensitivity to insecticides of Spodoptera exigua strains feeding on different host plants

The variations of sensitivity to several common insecticides of Spodoptera exigua （Hubner） after feeding on different host plants were measured in this study, which can be used as reference for the study of pest resistance, and provide theoretical evidence for the study of safety and economically utilization. The growth of S. exigua and its sensitivity to insecticides were apparently influenced by the host plants fed on. After feeding on different host plants, two strains of S. exigua exhibited different sensitivity to deltamethrin, chlorpyrifos, chlorfenapyr and tebufenozide. The results showed that pupal black mutation （melanism） strain had higher resistance than wild type, and both two strains had significant difference in the sensitivity to deltamethrin, in which the induced resistance ratio varied to 13.36 and 12.30 times, respectively. However, both two strains had no significant difference in the sensitivity to tebufenozide, in which the greatest induced resistance ratio reached to 2.54 and 2.23 times, respectively.