不同寄主作物上桃蚜对药剂敏感性的研究

桃蚜Ｍｙｚｕｓ ｐｅｒｓｉｃａｅ（Ｓｕｌｚｅｒ）在我国蔬菜、作物和桃树上是主要害虫。用生菜、茼蒿、烟草、芥蓝、萝卜连续饲养两个世代后，研究它在不同作物对杀虫剂的敏感性。试验结果表明：当用植物质杀虫剂处理饲养在萝卜上的桃蚜时，它对此种药抗性比较大，而饲养在生菜上的桃蚜则比较敏感。用乐果处理结果相似。研究认为，关于在不同寄主上的桃蚜，对杀虫剂的敏感性不同，这在田间毒理的研究，是有理论意义的。至于田间应

EFFECT OF HOST PLANTS ON THE SUSECPTIBILITY OF THE GREEN PEACH APHID Myzus persicae(Sulzer)TO INSECTICIDES

The green peach aphid Myzus persicae(Sulzer)is a major pest on vegetables,crops and peach in China.The nymphs of the aphid were reared for two successivegenerations on five different hosts viz. lettuce(Lactuca sativa),crowndaisy chrysnathemum(Chrysanthemum coronarium),tobacco(Nicotiana tabacum,Linn.),mustard(Brassicaalboglabra Bail.)and radish(Raphanus sativus L.)to study the effects of hostplants on the suseeptibility to insecticides.Results of laboratory experiments showedthat when sprayed with 0.39 % of rotenone(isolated from Derris root),the aphidsfeeding on radish were the most tolerant to this botanical insecticide,while thosefeeding on lettuce were the most susceptible to this insecticide. Treatment withdimethoate showed similar results.Possible mechanism for the responses to the twoinsecticides,induced by food plants and their sigificances to field application ratesin relation to IPM program were discussed.