Green peach aphid, Myzus persicae (Sulzer), is the major vector of potato leaf-roll virus and potato virus Y. Immigration of M. persicae into Minnesota and North Dakota each spring is associated with certain low level wind events. However, the source of these immigrants remains uncertain. A meteorological HYSPLIT model, developed by the NOAA Air Resources Laboratory was used to back track the sources of each wind event that could have transported M. persicae into our area. Most of these events originated in Texas, Kansas, Missouri, Oklahoma, and Nebraska. Geographic information system (GIS) ArcView 3.2 was used to map winter minimum temperature isotherms to identify the geographic limits to the possible over-wintering of anholocylic populations, and to map the distribution of peach, the primary (winter) host for holocyclic populations within this region. Potential future genetic analyses will also be discussed. The goal of this research is to develop a model to predict current season M. persicae pressure based on synoptic weather patterns, i.e., the timing, duration, and origin of spring wind events that could transport immigrant M. persicae into Minnesota and North Dakota.