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Oomycetes, or water molds, are a group of organisms that are mostly aquatic and live in freshwater environments. Some are saprophytic, living off dead and decaying organisms, while others are parasitic, infecting algae, plants, and animals. The main orders of oomycetes include Saprolegniales, Leptomitales, Legenidiales, and Peronosporales. The order Peronosporales contains many economically important plant pathogens that cause diseases in crops like potatoes, tomatoes, and grapes.Read less