Hyaloperonospora parasitica

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Hyaloperonospora parasitica (hyphae with haustoria) on Arabidopsis thaliana (click on image to enlarge it)
Author(s): Emmanuel Boutet
Source: Wikimedia Commons

Hyaloperonospora parasitica (Pers.) Constant. 2002

This oomycete is widely distributed causing downy mildew diseases on Brassica oleracea and other crucifers like canola/oilseed rape (see also Hyaloperonospora brassicae). Mainly young Brassica seedlings are susceptible and are often killed by the disease. Infections in older plants result in a yield reduction.

Synonyms:
Peronospora parasitica