An experiment was carried out to study the effects of host alteration on population characteristics of Myzus persicae. The results showed that, except the alteration from rape to peach, the aphid could be successfully altered among tobacco, rape and peach. The pre reproductive time was shorter and reproduction was higher in the alteration within the same host than those in the alteration among different hosts. The intrinsic rates of natural increase r m of the aphid population in various host alte...