Pythiales

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Pythium aphanidermatum sporangium (click on image to enlarge it)
Author(s): Gerald Holmes, Valent USA Corporation
Source: IPM Images

Pythiales

Pythiales is an order of oomycetes which contains many important plant pathogenic fungi. Many species are soil-borne and invade their host through the roots. The order is closely related to the Peronosporales, the downy mildews. The separation between both orders is mainly based on their genetic structure.

The following genera are currently entered under Pythiales: