Fungi, nematodes and oomycetes belong to the most prominent eukaryotic plant pathogenic organisms. Unicellular organisms from other eukaryotic lineages, commonly addressed as protists, also infect plants. This review provides an introduction to plant pathogenic protists, including algae infecting oomycetes, and their current state of research.

Applied Plant Ecophysiology Haute Ecole Provinciale de Hainaut Condorcet Ath 7800 Belgium

Department of Plant Biology Uppsala BioCentre Linnean Centre for Plant Biology Swedish University of Agricultural Sciences Uppsala SE 75007 Sweden

Faculty of Sciences University of South Bohemia 37005 České Budějovice Czech Republic

Institute of Microbiology University of Innsbruck Innsbruck 6020 Austria

Institute of Parasitology Biology Centre 37005 České Budějovice Czech Republic

Integrated Microbial Biodiversity Canadian Institute for Advanced Research Toronto Ontario M5G 1Z8 Canada

New Zealand Institute for Plant and Food Research Ltd Lincoln 7608 New Zealand

Plant Pathology Institute of Integrative Biology ETH Zurich Zurich 8092 Switzerland

School of Biosciences University of Melbourne Parkville Vic 3010 Australia

School of Biosciences Victorian Marine Science Consortium Queenscliff Vic 3225 Australia

The Scottish Association for Marine Science Scottish Marine Institute Oban PA37 1QA UK

Université catholique de Louvain Earth and Life Institute Louvain la Neuve 1348 Belgium

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