The International Potato Center (CIP) and GILB sponsored a mini-symposium on late blight management at CIP Headquarters, Lima, Peru, on 20 April 2004. Fifty-two participants from Peruvian universities and from the national potato program and plant quarantine laboratory attended. Greg Forbes, GILB Coordinator from CIP, gave a short overview of GILB. Dani Shtienberg from the Department of Plant Pathology, ARO, the Volcani Center, Israel, presented some intriguing results of research on developing means to cope with late blight in organic production of tomatoes with reduced rate of copper compounds. Jorge Andrade-Piedra from Cornell University described the modification, validation and qualification of the pathogen sub-model of the LATEBLIGHT simulator. LATEBLIGHT was developed in the early 1980's at Cornell University and has been extensively used to generate and test hypotheses about the epidemiology of potato late blight in the temperate region. The modifications were made to accommodate the diverse environmental conditions that occur in the dramatically rugged topography of the tropical highlands. The resulting version of LATEBLIGHT can accurately predict the effect of weather and host resistance on late blight epidemics. For more information see Research/Disease Management/Epidemiology and Disease Simulation on the GILB website at http://gilb.cip.cgiar.org