Abstract
In Kagoshima Prefecture, Myzus persicae (SULZER) and Lipaphis erysimi (KALTENBACH) overwinter predominantly as viviparae. Seasonal prevalence of the aphids was surveyed by collecting alatae with yellow pan water traps and counting aphids on rapes and radishes in the Osumi district during the period 1978-1980. M. persicae population was high from April to June and from November to January, the peak density being higher in spring. The population of L. erysimi was high from October to January. The population density of both aphids was maintained at a very low level from July to October.
