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Hyaloperonospora arabidopsidis (Hpa; formerly Peronospora parasitica or Hyaloperonospora parasitica) is an oomycete downy mildew pathogen of the model plant Arabidopsis. The pathosystem between Arabidopsis and Hpa has been extensively used to study host/pathogen co-evolution (Coates and Beynon, 2010). As Hpa is an obligate biotrophic pathogen, its host is absolutely required for survival. Thus, Hpa must be maintained on susceptible Arabidopsis accessions and mutants. Growth of Hpa is evaluated in two ways; counting conidiospores (Asai et al., 2014) or counting sporangiophores after trypan blue staining (Holt et al., 2005). Here, we describe how to do inoculation with Hpa and how to evaluate Hpa growth on Arabidopsis.