Dr. Lawrence E. Datnoff is Professor of Plant Pathology, University of Florida, Everglades Research and Education Center. Since 1988, he has been studying the role of silicon for plant disease control in rice in Florida, USA, Colombia and Brazil, and in turfgrass in Florida, USA. His interests have included understanding the interactions of silicon with fungicides, residual effects of silicon on disease development, enhancement of host plant resistance and the mechanism(s) of resistance. Dr. Datnoff is a former Associate Editor of Plant Disease, a Fulbright Scholar and a recipient of the University of Florida-Institute for Food and Agricultural Sciences' Interdisciplinary Team Research Award. Dr. George H. Snyder is Distinguished Professor of Soil Science, University of Florida, Everglades Research and Education Center and a University of Florida Research Foundation Professor. Since 1979, he has been studying the role of silicon fertilization for rice and sugarcane grown on organic and sand soils in Florida, USA, and on Oxisols in other countries. In addition to plant responses, his interests have included soil testing for plant-available silicon, silicon analysis of plant tissue, and evaluation of various potential silicon fertilizers. Dr. Snyder is an Associate Editor of Crop Science, Past-President of the Florida Soil and Crop Science Society, and a Fellow of the American Society of Agronomy and the Soil Science Society of America. Dr. Gaspar H. Korndorfer is Professor of Soil Science and Plant Nutrition, Federal University of Uberlandia, Brazil. Since 1994 he has been studying the role of silicon fertilization for sugarcane, rice and pasture in Brazil and Florida, USA. His interests have included silicon plant responses, evaluation of potential silicon sources, soil testing for plant-available silicon, and the influence of silicon on plant tolerance to water stress. Dr. Korndorfer is also a CNPq Scholar and teaches "Use of Fertilizer and Residues in Agriculture" to graduate students.