The Family Pythiaceae is a group of fungal plant pathogens that includes several different genera. Some synonyms for this family include the Peronosporaceae, the Plasmoparaceae, and the Phytophthoraceae. These families all share similar characteristics and are known for causing diseases in a variety of plants, including potatoes, soybeans, and grapevines. The Pythiaceae family is also sometimes referred to as water molds or oomycetes, as they require moist environments to thrive. Understanding the different names used for this family is important in properly identifying and treating plant diseases caused by these pathogens.