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smooth-walled oogonium of Phytophthora alni with oospore and amphigynous antheridium (click on image to enlarge it)
Author(s): Thomas Jung
Source: IPM Images

Oomycota - plant pathogenic oomycetes

Oomycota are a group of fungal-like, multicellular organisms which appear to be closer related to the algae than to the true fungi. The separation of the oomycetes from the fungi was based, among others, on the structure and position of the flagella in mobile cells (the biflagellate zoospores).

Oomycota are characterized by the formation of thick-walled sexual oospores and their close association with water. They typically disperse through running water or rain splashes.

For details see the respective page in Wikipedia.

This page only deals with plant pathogens. For other groups of oomycetes in the system see

The system currently includes the following orders of plant pathogenic Oomycota: