Foreword.- Biology and Evolution.- Phylogenetic investigations in the genus Pseudoperonospora reveal overlooked species and cryptic diversity in the P. cubensis species cluster.- Host matrix has major impact on the morphology of Pseudoperonospora cubensis.- Cucurbit downy mildew (Pseudoperonospora cubensis) - biology, ecology, epidemiology, host-pathogen interaction and control.- Spinach: better management of downy mildew and white rust through genomics.- Advances in sunflower downy mildew research.- Resistance mechanisms and host-parasite interactions.- Histological responses of host and non-host plants to Hyaloperonospora parasitica.- Distribution of race-specific resistance against Bremia lactucae in natural populations of Lactuca serriola.- Site-specific field resistance of grapevine to Plasmopara viticola correlates to altered gene expression and was not modulated by the application of organic amendments.- Influence of nitric oxide and reactive oxygen species on development of lettuce downy mildew in Lactuca spp..- Identification of genes expressed during the compatible interaction of grapevine with Plasmopara viticola through suppression subtractive hybridization (SSH).- Population ecology and control.- Quantitative studies on downy mildew (Peronospora destructor Berk. Casp.) affecting onion seed production in southern Uruguay.- Diversity and fitness of Plasmopara viticola isolates resistant to QoI fungicides.- Evolution of Qol resistance in Plasmopara viticola oospores.- EMS and UV irradiation induce unstable resistance against CAA fungicides in Bremia lactucae.- Influence of dosage, storage time and temperature on efficacy of metalaxyl-treated seed for the control of pearl millet downy mildew.