The book is focused on the most recent and significant advances in research on downy mildews and related oomycete pathogens. The emphasis is on the biology of downy mildews, mechanisms of resistance in host- and non-host parasite interactions, population ecology and epidemiology, chemical control and fungicide resistance. The chapters are written by leading international experts on various aspects of downy mildews. All contributions are either comprehensive critical reviews or original research papers, and cover the most relevant and recent topics related to these biotrophic plant pathogens. The recent Special Issue is a continuation of previous one published by Springer in 2008.