Occurrence, Toxicological and Ecotoxicologlcal Significance of Pesticides in Groundwater and Surface Water.- The Mobility of Pesticides in Soil - Studies to Prevent Groundwater Contamination.- Strategies to Minimize the Pollution of Water by Pesticides - A Critical Review to Plant Protection Measures in the Past, Present and Future.- Pesticide Metabolism in Aquatic Organisms.- Fate of Pesticides in Aquatic Environments.- Pesticides in Soil: A German Approach of Predicting Their Movement into Ground and Surface Water.