The two maps below compare speculative movement of Psyllid.  One uses the literature recorded Psyllid flight of 1.5 miles, showing it in a radius from the known infected trees.  The other uses a five mile buffer around positive Greening trees.  There is truly no way of knowing at this point what the actual spread of Psyllid is, this is simply to provide perspective on the importance of protecting your grove from infected Psyllid with aggressive management practices.