EN
Studies aimed at developing the internet application for potato late blight forecasting in Poland were undertaken within the framework of multilateral cooperation between the following institutions: Institute of Plant Protection – National Research Institute (IPP – NRI), Institute of Soil Science and Plant Cultivation, Plant Breeding and Acclimatization Institute and Danish Institute of Agriculture Science in 2001–2002. A significant contribution to that project was made by the cooperation between IPP – NRI and German Central Institution for Decision Support Systems and Programmes in Crop Protection (Zentralstelle für Entscheidungshilfen und Programme im Pflanzenschutz, ZEPP) in 2003–2007. This cooperation enabled Polish partners to acquaint with the Information System for Integrated Crop Protection developed in Germany, and with some aspects of extension service work conducted with the help of Internet based decision support system. This knowledge was useful to Polish partners for developing the information system on the occurrence of Phytophthora infestans on potato plantations. The system provides the information on late blight threat to potato, based on the assessment model by Ullrich i Schrödter and the results of monitoring conducted by Advisory Service on chosen potato plantations. Moreover, the system provides the information on Phytophthora infestans life cycle and numerous pictures concerning potato late blight symptoms.