PP263, a 2-page English/Spanish ID sheet by M.M. Dewdney, J.D. Yates, R.H. Brlansky, T.M. Spann, and M.E. Rogers, guides identification of Citrus Greening and provides a comparison chart for Citrus Greening, Blight and Tristeza. Published by the UF Department of Plant Pathology, May 2009.
http://edis.ifas.ufl.edu/PP263